| Author |
Pan, Chun |
| Title |
A support tool for PSP and TSP |
| Department | Dept. of Computing |
| Year | 2005 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Computer software -- Development Software engineering |
| Degree | M.Sc. |
| Pages | 2, 59 leaves : ill. ; 30 cm. |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1834228 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/5484 |
| Abstract |
Many businesses and lives now depend on software. We need larger, more complex, and safer software systems on predictable schedules. Most Chinese software organizations are facing critical business needs for effective quality, better cost and schedule management, and cycle-time reduction with exponential increases in software complexity and size. The challenge, then, lies with bridging this gap and applying techniques to successfully handle this ever-increasing software complexity. The motivation behind this research is to introduce some modern approach to help the software industry of Mainland China more reliable to produce higher quality software by focused on process, that is, to make an advance toward the end of the Software Crisis. The Personal Software Process (PSP) and Team Software Process (TSP) present a modern way to develop and maintain software to meet current critical business needs. A large amount of practice results show that TSP teams are delivering essentially defect-free software on schedule, while improving productivity. "Process Dashboard" is a powerful supporting tool which can remove the barriers in the PSP/TSP adoption. "Process Dashboard" developed by Software Process Dashboard Initiative is a world-class tool under the open-source model, and is available for anyone using the PSP and/or TSP. Sharing the zeal of SEI and Software Process Dashboard Initiative would definitely promote these remarkable technologies to mainland China software industry. This thesis aims to introduce "Process Dashboard"--a PSP and TSP tool and provide a guideline and framework for Mainland China software engineers and organizations in specific, in order to help them deliver high-quality software products at agreed cost and schedule. Some enhancement special for Mainland China software engineers and organizations also implemented on the basis of analyzing the local china situation. |
| Author |
Tang, Shun-leung |
| Title |
Suppression of structural vibration with a new type of vibration absorber |
| Department | Dept. of Mechanical Engineering |
| Year | 2004 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Structural dynamics Vibration Damping (Mechanics) |
| Degree | M.Phil. |
| Pages | x, 112 leaves : ill. (some col.) ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1772677 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/2673 |
| Abstract | A new type of dynamic vibration absorber (DVA) has been designed to be the combination of different types of vibration absorbers attaching at a single point, which, was proposed and evaluated for vibration suppression. The effects of a number of absorber parameters and locations of attachment have been compared. Holographic full-field vibration visualization techniques have been tried for finding a suitable location of absorber on the controlled structure. Basic theories of the new dynamic absorber in suppression of vibration have been established. The suppression of harmonic vibrations of a single-degree-of-freedom (SDOF), multi-degree-of-freedom (MDOF) discrete system and continuous systems such as beams and plates by the proposed dynamic vibration absorbers have been evaluated by both computer simulations and experimental tests. The results obtained in both parts are presented and discussed. For suppression of rigid body vibration, the performance of the commonly used translational absorber was compared to those of a rotational absorber and the proposed absorber. From the numerical analysis, it was found that the translational one has the poorest performance in terms of the range of the absorption frequency; rotational absorber is better while the proposed absorber can completely absorb all the rigid body vibrations. For flexural vibration of continuous structures such as beams and plates, the performance of the commonly used translational absorber was compared to those of the rotational absorber and the proposed absorber by finite element analysis and experimental tests. It was found that the proposed type of absorber provides excellent performance and simpler implementation than those of the standard sprung mass absorbers as reported in textbooks and other published literature. Even though there are many techniques for the optimization of tuning and location of vibration absorbers as reported in the literature, most of them require highly computational intensive analysis before the user can determine the tuning values and the best location of the absorber. The proposed absorber is a combination of translational and rotational absorbers to be attached onto the vibrating structure at a single point. With the knowledge of the modal parameters of the structures, it is straightforward to determine an effective attachment point for suppression of vibration. The numerical predictions are verified by experimental tests. |
| Author |
Cheng, Xi |
| Title |
Surface bidirectional reflectance and albedo properties derived with MODIS and AERONET observations and global albedo mapping |
| Department | Dept. of Land Surveying and Geo-Informatics |
| Year | 2011 |
| Subject |
Earth sciences -- Remote sensing. Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | vii, 76 leaves : ill. (some col.) ; 30 cm. |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b2457874 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/6230 |
| Abstract | Deriving accurate surface albedo properties and products is of great significance in applications of remote sensing on both land surface and atmosphere. Surface bidirectional distribution function (BRDF) and global albedo maps are derived using MODIS and global AERONET combination observations. Instead of traditional pixel-based approach, an object-oriented approach is employed using clear-sky reflectance data for same land-cover with normalized difference vegetation index (NDVI) also taken into account. The BRDF parameters was modeled via the inversion fitting of observations grouped into small bins according to observation parameters including SZA (solar zenith angle), VZA (viewing zenith angle) and RAA (relative azimuth angle). Observations were further grouped according to NDVI to discriminate different bio-physical status of vegetation. A robust statistical processing was used to every group to reduce outliers and influence of noise. Inter-comparison was carried out between modeled BRDF parameters and albedo and available albedo products. A good agreement was generally reached globally using land cover-based approach between model-calculated albedo and observed albedo. Finally, a global albedo map was produced using the approach put forward based on global land cover base map. |
| Author |
Cheung, Ka-yiu |
| Title |
Surface enabling technology for direct copper drilling in thin PCB manufacture |
| Department | Dept. of Industrial and Systems Engineering |
| Year | 2004 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Printed circuits Multichip modules (Microelectronics) Copper -- Electrometallurgy Laser welding Drilling and boring |
| Degree | M.Phil. |
| Pages | 152, [190] leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1781115 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/3047 |
| Abstract | Laser technologies are being investigated and adopted to form very small blind holes (blind micro-vias) by PCB manufacturers for high-density interconnect (HDI) printed circuit boards (PCBs). Conventionally, CO2 laser systems are used by the industry due to their higher productivity if only epoxy resin is to be ablated. Therefore, to form micro-vias by CO2 lasers, chemical etching of the top copper layer of the PCB is necessitated as copper's absorption of the CO2 laser is very low. The etched copper "window" serves as a conformal mask for subsequent CO2 laser drilling. As there are limitations and problems in (i) chemical etchants flowing into micro-vias of smaller size, and (ii) registration in the conformal masked laser drilling method, "direct" copper drilling by CO2 laser irradiation without using a conformal mask can be a promising alternative for HDI PCB manufacture. This research work aims to investigate and develop direct laser drilling technology by studying different control factors. Firstly, experiments were performed to investigate and evaluate different dielectric materials by CO2 laser ablation in terms of micro-via qualities including blind hole shape, resin residue inside the blind hole, and the roughness of the blind hole walls. The results of the experiment indicate that resin-coated copper is more suitable and appropriate for the development of direct copper drilling technology (CDD). Secondly, the effects of surface pre-treatments in enhancing the laser absorption of the copper surface were studied. Different black oxide and oxide replacement treatments were investigated for CDD by CO2 laser ablation. The laser absorption of the treated copper surfaces and the surface topography were evaluated as well. The critical processing parameters affecting the quality and reliability of the oxide coating were also studied in this research. Irradiating at the same laser energy, the oxide replacement treatment (Multibond) showed a higher surface roughness (Ra=0.5606) and a coarser grain structure, enabling higher laser energy absorption and thus resulting in laser-drilled micro-vias with better hole shape and quality. Thirdly, experiments were carried out to study different technologies for etching down the copper thickness (copper reduction), as copper thickness is believed to play an important role in enabling CDD. The uniformity of copper thickness across the PCB panel resulting from different etching processes was investigated. The characteristics of the different copper reduction processes were compared and studied, including the critical process factors, chemical characteristics, and machine design and configuration. It was found that the requirement of the uniformity of copper thickness could be achieved by some of the copper reduction technologies in the study. There was no sharp increase of surface roughness and no significant change in surface topography by increasing the number of cycles of the copper reduction process. The result of the research revealed that Multibond was the most appropriate copper reduction process for CDD. This is because Multibond was able to reduce the copper thickness very evenly (+-0.5um) and at the same time provide an oxide coating on the copper surface for enhancing laser absorption. The last part of the research focused on the optimization of the laser drilling conditions (such as energy level per pulse, pulse width, number of shots) for different copper thicknesses. It was found that the amount of total laser energy level required for CDD was proportional to the thickness of the copper layer to be "burnt-off". Also, longer cycle times were needed to "burn-off' micro-vias with a thicket copper layer. As a threshold, the copper layer thickness has to be reduced by an appropriate reduction process to around 5 to 7um to enable CDD. At this range of copper thickness, a minimum of two pulses of laser irradiation with a short pulse width are recommended for direct copper drilling. For example, in drilling 100um micro-vias on resin-coated copper of 5um thickness and 65um thickness epoxy, it was found that the best set of laser drilling parameters are: one shot of l0milli-joules laser energy followed by two shots of 2milli-joules laser energy, all with 9us of pulse width. Finally, the reliability of laser-ablated micro-vias was checked and verified by the Interconnect Stress Test (IST) test and the thermal stress test. The critical processing parameters (energy per pulse, pulse width and number of pulses) were optimized to establish conclusive recommendations in enabling direct copper laser drilling technology for PCB micro-via formation. |
| Author |
Wong, Kam-po |
| Title |
Surface finishing optimization in pulse reverse current electroforming of nickel |
| Department | Multi-disciplinary Studies |
| Year | 1998 |
| Subject |
Electroforming Nickel-plating Pulse plating Metals -- Finishing Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | vii, 101 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1421131 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/2446 |
| Abstract | Due to high repetitive forming accuracy and high fidelity of shape reproduction, electroforming has been demonstrated to be a powerful means of fabrication of many micro-devices or products with dimensions in the micro-meter range. Electrodeposition of metals to the thickness required for electroforming inevitably results in roughening of the deposited surface. Owing to the small size of micro-electroformed components, it is not feasible to adopt post-machining to improve the texture of the deposited surfaces. Therefore, good surface finishing is required in micro-electroforming. In electroforming, the surface finishing of a deposit formed by Pulse Reverse Current (PRC) was reported to be better than that formed by Pulse Current (PC) or Direct Current (DC). In order to obtain the best possible surface finishing of nickel electroforms, reasonable short-pulse with suitable high current density at a constant fraction of limiting current which leads to a thin mass-transfer boundary layer following the surface contour of mandrel should be applied. In this case, the peaks and the recesses on the surface profile of the mandrel will be much equally accessible for diffusion, and hence the amplification of asperities can be minimized. However, up to present, there is still no comprehensive theory yet to study simultaneously the effects of all the control factors or parameters on Surface Finishing (SF) in PRC electroforming. In this dissertation project, a mathematical model based on orthogonal arrays of the factorial design approach by Taguchi Methods was developed, formulated and verified for finding the optimum condition in PRC electroforming so as to improve the surface finishing of nickel electroforms to a higher extent. As identified in the experimental design by Taguchi Methods, the most significant factors, which affect the outcome of asperities (i.e. ΔR) in the PRC electroforming process, are Positive Peak Current Density as well as Anodic Time of Mandrel. According to the mathematical model, the predicted optimum condition with the lowest ΔR for the best possible surface finishing result was found at ip=850mA/cm2, Toff=3m-sec, Ton=5m-sec, and in=650mA/cm2 for ΔR=0.1um. In order to minimize the experimental errors, a set of verification experiments, with a range of setting closing to this predicted optimum condition, was performed. In the subsequent verification tests, the optimum condition with the lowest ΔR for the best possible surface finishing result was found at ip=870mA/cm2, Toff=3m-sec, Ton=5m-sec, and in=650mA/cm2 for ΔR=0.05um. This finding is close to the one predicted by the model. And so, the model is valid and adequate. Hence, with the use of Taguchi Methods, the best possible surface finishing of nickel electroforms can be achieved successfully. |
| Author |
Chiu, Ka-yu |
| Title |
Surface modification of AISI 316L stainless steel using different forms of NiTi for improving cavitation erosion resistance |
| Department | Dept. of Applied Physics |
| Year | 2005 |
| Subject |
Hong Kong Polytechnic University -- Dissertations. Steel, Stainless. Lasers -- Industrial applications. Surface mount technology. |
| Degree | M.Phil. |
| Pages | xv, 158 leaves : ill. ; 30 cm. |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1835533 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/1588 |
| Abstract | AISI 316L stainless steel is widely used in hydraulic machinery and in liquid-handling systems mainly because of its excellent corrosion properties, good machinability, and relatively low cost. For such applications, cavitation erosion may become a major mode of attack under certain circumstances. Due to its low hardness (=200 HV), the cavitation erosion resistance of 316L may not be adequate in harsh environments. In view of this low erosion resistance, the range of applications of 316L stainless steel may thus be limited, albeit it has desirable properties in other respects. It is the aim of the present project to improve the cavitation erosion resistance of 316L via surface modification. It is well known that nickel titanium (NiTi) possesses superior cavitation erosion resistance mainly because of its superelasticity. In addition NiTi possesses a high corrosion resistance comparable to that of stainless steel. These desirable mechanical and electrochemical properties of NiTi make it a good candidate as a cladding material for 316L stainless steel. In the present study, three surface modification methods have been employed, using different forms of NiTi. These include: Method (1): laser surface alloying (LSA) of 316L using NiTi powder, Method (2): laser cladding (LC) on 316L using NiTi strips, and Method (3): cladding of 316L with NiTi plate by microwave-assisted brazing (MWAB). These methods, each with its own limitations and merits, are capable of significantly increasing the cavitation erosion resistance Re, the improvement reached being in the range of 20-40 folds. The increase in Re is lowest in Method (1) and highest in Method (3) because of the difference in the degree of dilution of NiTi by the substrate. A low dilution of NiTi in Method (3) allows the cladding to retain a large portion of the superelasticity of bulk NiTi. On the other hand, the bonding strength achieved in Method (3) is relatively low because bonding was formed via diffusion rather than fusion as in the other two methods. Since surface modification against cavitation erosion is usually applied at locations of an engineering part that are prone to attack, galvanic effect between the cladding and the neighboring substrate is expected to be present. Nevertheless, the galvanic effect between the NiTi cladding and the 316L substrate is only minimal as evidenced by a low galvanic current density in the NiTi-316L couple for all the three cladding methods. Hydrogen embrittlement of Ti-based alloys is another concern for applications in aqueous environments. In view of this, the effect of hydrogen uptake on the cavitation erosion of the cladding was investigated using electrolytic hydrogen charging. The cavitation erosion resistance is reduced due to the formation of hydrides, or to hydrogen induced softening. The effect of hydrogen might not be a real threat since the NiTi-modified part is anodic to the neighboring steel and is protected from hydrogenation. The present study has demonstrated the feasibility of improving the cavitation erosion resistance of AISI 316L using NiTi in different forms. |
| Author |
Sun, Yue |
| Title |
Surface modification of polydimethysiloxane through plasma ion implantation |
| Department | Dept. of Applied Physics |
| Year | 2014 |
| Subject |
Elastomers. Ion implantation. Plasma (Ionized gases) Surfaces (Technology) Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Phil. |
| Pages | xvii, 105 leaves : col. ill. ; 30 cm. |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b2747282 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/7488 |
| Abstract | Polydimethylsiloxane (PDMS) is a silicone elastomer with many attractive properties such as machinability, low cost, and resistance to corrosion in various industrial and biomedical applications, among many others. Due to the chemically-inert nature of PDMS, modifications are necessary for the introduction of various functional groups on PDMS surfaces. One of such methods is plasma implantation. On the other hand, plasma implantation treatment can induce significant changes to the surface morphology of the samples, such as periodic rippling of surfaces in localized areas (less than hundreds of microns) that are otherwise disordered on macroscopic scales. In this project, I investigated the development of induced ripple structures formed during the plasma treatment process. It was found that a surface prepatterning step of the PDMS surface could lead to the suppression of the wavy patterns, if the implantation voltage was small. As the plasma voltage increased, the prepatterns on PDMS could guide the development of ripple growth on the surfaces, which may be used for studying the wrinkling mechanism on elastic surfaces, and for developing surfaces with designed hierarchal sub-micron or nanometer features. The effect of plasma implantation duration, and the influence of surface prepattern dimensions, were investigated. To demonstrate the applications of such ion-implanted PDMS surfaces, plasma-treated samples were used as substrates for cell culturing studies for different cell types. Processing parameters (plasma bias voltage, processing time, surface prepattern features, etc.) were varied to induce different topologies on PDMS surfaces. A systematic investigation of cell culturing on the patterned surfaces was conducted. By using MC3T3-E1cells cultured on prepatterned samples, I demonstrated the importance of controlling the surface feature sizes and the depths of prepatterned features on the cell growth processes. To illustrate the biocompatibility of these prepatterned features, cell adhesion and cell proliferation experiments were performed using both MC3T3-E1 and EAhy926 cells. In addition, to evaluate the importance of patterned surfaces in inducing cell alignment, HeLa cells were cultured on hierarchal patterns formed by high-voltage implantation of hierarchal surfaces. In summary, this work investigated the influence of surface prepatterning on the development of the topology of PDMS surfaces during plasma implantation process. Through careful control of both the surface prepatterns and the implantation conditions, a rich variety of surface features (ranging from minimal surface corrugations to the formation of hierarchal features) were obtained, demonstrating the power of combining the two techniques in the surface topology modification of elastomer surfaces. Since the surface prepatterning steps can be easily scaled for large-scale manufacturing, it should be directly applicable for industrial-scale surface modification processes. An attempt was also made to use the treated PDMS for cell studies in vitro, illustrating the possibility of interdisciplinary studies using such a material system. |
| Author |
Ng, Wai-fong |
| Title |
Surface modification to improve the corrosion resistance of Mg for the development of degradable orthopedic implants |
| Department | Dept. of Applied Physics |
| Year | 2009 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Bone plates (Orthopedics) Magnesium alloys Orthopedic implants |
| Degree | M.Phil. |
| Pages | 1 v. (various pagings) : ill. (some col.) ; 31 cm. |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b2343003 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/5687 |
| Abstract | Bone plates are commonly employed for internal fixation in bone fracture healing. There are two types of bone plates: non-degradable and degradable. Non-degradable bone plates are currently made of metallic materials like stainless steels and titanium alloys. After bone healing, these plates might have to be removed by a second surgery, especially in young patients so as not to restrict bone growth. On the other hand, degradable bone plates do not require removal after bone healing because they degrade in the human body like resorbable sutures. Currently, degradable bone plates are made of polymeric materials and their low mechanical strength only qualify them as low load-bearing parts. Thus development of degradable metallic bone plates which combine high strength and degradability is interesting and important in bone fracture healing. Magnesium (Mg) is a promising candidate material for degradable metallic bone plates owing to a number of desirable characteristics: (i) Mg is non-toxic and biocompatible; (ii) Mg possesses mechanical properties close to those of human bones, thus minimizing the possibility of stress shielding; and (iii) Mg is degradable in the human body environment. However, the corrosion rate of Mg in body fluids is too high for Mg bone plates to maintain adequate mechanical support in the bone healing phase. Improvement of corrosion resistance is thus an essential step in the development of Mg bone plates. The present project aims at developing different coatings on Mg for decreasing the corrosion rate in the bone healing phase. In this connection four different coating systems have been attempted, including: (1) cerium oxide (CeO₂) coating on pure Mg by cathodic deposition in cerium nitrate solution followed by hydrothermal treatment, (2) sol-gel titanium oxide (TiO₂) coating on microarc oxidized Mg, (3) aluminum-alumina (Al-Al₂O₃) composite coating with aluminum coating fabricated by physical vapor deposition followed by anodization in sulfuric acid, and (4) stearic acid (CH₃(CH₂)₁₆COOH) coating on Mg pre-coated with hydroxide. The coatings formed were studied using various characterization techniques including scanning-electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), X-ray diffractometry (XRD), and Fourier transform infrared spectroscopy (FTIR). The corrosion resistance of various coated Mg samples was studied in Hanks' solution (a simulated body fluid) at 37°C by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. The corrosion behavior was also monitored in immersion tests over an extended period at different pH values of the Hanks' solution. The corrosion resistance of all the coated Mg samples was significantly higher than that of bare Mg, though their performance differed. Among various types of coatings, stearic acid coating was found to be the most effective, providing an increase in corrosion resistance which reached as high as 4 orders of magnitude in the initial period, and gradually dropped to about 40 times in the long run. The results of the present project thus demonstrate the possibility of significantly lowering the in vitro corrosion rate of Mg and hence contribute to the development of degradable Mg bone plates. A preliminary study of the effect of albumin on the corrosion rate of Mg samples was also attempted. |
| Author |
Cheung, Lap-fai |
| Title |
Surface profilometry using optical contouring method |
| Department | Multi-disciplinary Studies |
| Year | 1998 |
| Subject |
Surfaces (Technology) -- Measurement Optical measurements Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | vii, 131 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1437027 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/107 |
| Abstract | Structured light projection method has been used to measure the contour of a surface. A structured light is projected onto a surface being measured to produce a modulated fringe pattern. This pattern is captured and analysed using modified Fourier transform analysis technique to determine the height of the surface. Errors of measurement have been evaluated. In developing the measurement method, besides developing a Window-based computer program for the automatic analysis of fringes obtained in the measurement. 1) A method employing a Wollaston prism-polarizer combination has been developed to produce the structured light pattern, and 2) A modified technique has been proposed to retrieve phase of the fringes from the contour map of the surface. |
| Author |
Liu, Shu-tim |
| Title |
Surface reconstruction of human face from stereo images |
| Department |
Multi-disciplinary Studies Dept. of Electronic Engineering |
| Year | 1999 |
| Subject |
Human face recognition (Computer science) Computer vision Image processing Image reconstruction Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | vi, 71 leaves : ill. (some col.) ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1485410 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/1561 |
| Abstract | Eigenfaces for recognition has advantages over other machine recognition schemes of face in its speed and simplicity, learning capacity, and relative insensitivity to small or gradual changes in the face image. Moreover, this scheme has practically been tested on a large database. However, the recognition rate decreases as the difference of viewing angle between a face image and its corresponding reference stored in the database increases. This is because conventional algorithms recognize a face by extracting the relevant information in a face image, encoding it with eigenfaces, and comparing its encoded output against a database of identified encoded faces. Thus, we proposed a new scheme to improve this weakness. In stead of performing the face recognition in 2D domain, we compare the depth maps of faces after performing a three-dimensional reconstruction of stereo images. Our approach makes use of a pair of stereo images to recover its disparity map by applying a parallel stereo matching algorithm that produces dense depth maps and preserves image features. The disparity map can pass through a geometrical calculation of stereo cameras to locate a reference 3D coordination system then. Since the obtained depth maps are typically noisy and not fully populated with known data points due to false match points and lack of texture, a mathematical curve fitting is necessary to fill in missing points and smooth the data. An adaptive smoothing algorithm has been investigated and used to refine the depth map and reconstruct 3D surfaces. This surface reconstruction scheme can be applied to a wide variety of problems, including face recognition, criminal identification, security systems and computer vision. |
| Author |
Lai, Tze-kay |
| Title |
Survey and study of design process in Hong Kong consumer product industry |
| Department |
Multi-disciplinary Studies Institute of Textiles and Clothing |
| Year | 2001 |
| Subject |
Manufacturing industries -- China -- Hong Kong Consumer goods -- China -- Hong Kong Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | v, 252 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1555538 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/1642 |
| Abstract | Since the China open door policy, a large amount of factories that were originally located in Hong Kong have migrated to China. Those still remain in Hong Kong are mostly focusing their work on design and development activities. Along with the ever-increasing demand of high quality product from the market, it is definitely important for Hong Kong consumer product manufacturer in delivering good quality product in order to maintain the competitiveness. The objective of this dissertation is to find out good design practices that benefit to consumer product manufacturer in Hong Kong. A comprehensive literature survey on the concept and theory of various leading quality experts along with ISO9000 and TQM theory concerning the key elements to product development work was done. Questionnaire was designed base on these key characteristics to collect objective data from five individual consumer product development companies in Hong Kong. A thoughtful qualitative analysis was carried out and successfully identify a number of good design practices along with recommendation for implementation of these findings. |
| Author |
Ng, Yin-chun Chris |
| Title |
A survey of management development needs of professionals in the construction industry in Hong Kong |
| Department | Dept. of Management |
| Year | 1993 |
| Subject |
Construction industry -- Management Construction industry -- Management -- Study and teaching Executives -- Training of Hong Kong Polytechnic -- Dissertations |
| Degree | M.B.A. |
| Pages | 109 leaves ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1150957 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/3120 |
| Abstract | This is an individual project for the partial fulfilment of the requirements for the degree of Master of Business Administration awarded by the Hong Kong Polytechnic. This project is a survey on the management education needs of professional managers in the local construction industry. The target groups of professionals are senior managers who are professionally qualified in their own expert fields related to construction industry and who are holding senior positions in their organisations. The survey was done by data and information collection through questionnaire. Because of limited resources, this survey is by no means a large scale research and the result of which should only be regarded as an indicative reflection of the attitude of a small group of senior professionals within the industry. All information and analysis are presented in this report. This report contains two sections - I & II. Section I consists of 4 chapters mainly covering some general discussion of the theoretical framework, a description of the local industry and the professional managers role, the research hypothesis, methodology and limitation. Section II consists of 3 chapters covering the findings and analysis which form the main part of this project. Conclusion and Recommendation is also contained in the last part of this section which serves as a summary of findings. |
| Author |
Ku, Yung-kan |
| Title |
A survey of office building owners' perceptions of office refurbishment & office tenants' perceptions of facility operational requirements |
| Department |
Multi-disciplinary Studies Dept. of Building Services Engineering |
| Year | 2002 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Facility management Office buildings -- Maintenance and repair |
| Degree | M.Sc. |
| Pages | xi, 141, [44] leaves : col. ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1656028 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/856 |
| Abstract | It is estimated that most existing commercial office buildings in Hong Kong, of which most were constructed in 1980s and 1990s, require refurbishment. If appropriate refurbishment is carried out, they have the potential to provide the office accommodation required for the 21st century by sustaining / enhancing rental income and / or retaining tenants. The successful refurbishment of an existing office building will deliver maximized rental income or building asset value to the building owner as well as fulfil tenants' / end users' facility operation requirements. The purpose of this research was to identify owners' perceptions of office refurbishment and tenants' perceptions of facility operational requirements so as to investigate potential mismatches in the expectations of outcomes the investments on office refurbishment. A postal questionnaire survey was used to collect data and information from a sample of owners of office buildings and tenants of office buildings over a period of two weeks. This data was verified and enhanced by a follow up interview of selected respondents. The results of the survey indicate that Grade A building owners' perceptions of refurbishment works matched the majority of office tenants' perceptions of facility operational requirements. However, Grade B & C building owners' perceptions were found not to match the level of the perceptions of office tenants. Following the Asian financial crisis, rental rates dropped approximately 34 per cent. The rental ratio difference for Grade B and Grade C buildings is only 2 per cent and 7.4 per cent respectively when compared with Grade A buildings. This further enhances the attractiveness of Grade A buildings, offering relative value for money in the Hong Kong commercial office sector, in terms of attracting, as well as, retaining tenants. |
| Author |
Tam, Po-kwong |
| Title |
Survey of the indoor air quality at schools |
| Department |
Multi-disciplinary Studies Dept. of Building Services Engineering |
| Year | 1999 |
| Subject |
Schools -- China -- Hong Kong -- Environmental aspects Air quality -- China -- Hong Kong Indoor air pollution -- China -- Hong Kong -- Measurement Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | xv, 57, [438] leaves : ill. (some col.), col. maps ; 31 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1485246 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/3715 |
| Abstract | Two different types of ventilation system are commonly adopted in the schools: i) window A/C units plus mechanical exhaust (and supply) fans and ii) natural ventilation supplemented by ventilation fans. There was not much research work conducted in school premises around the territory. Besides, after implementation of the Noise Control Ordinance, many new and existing schools have installed air-conditioning system. According to information from the Education Department, the Department has already arranged to install air-conditioning equipment in approximately 5,400 classrooms to alleviate the noise problem. It is beneficiary and worthwhile to investigate the indoor air quality at schools so as to sort out any possible health risk to the building occupants, especially the children. On the other hand, government or subvented schools constructed by either the Architectural Services Department (ASD) or the Housing Department (HD) are more or less similar, both in the building appearance and the services installed. The mechanical ventilation system design will be discussed in Chapter 8. Besides, the IAQ records taken from these schools can be set up as a database for future reference. The main objectives of this research project are 1) to investigate the effect of the type of ventilation on the air quality inside classrooms, particularly the carbon dioxide concentration, temperature and relative humidity. 2) to apply the statistical software - Statistical Package for the Social Sciences (SPSS) and verify for any possible correlation between indoor air parameters and students' reported symptoms inside classrooms. 3) to study the Year 2000 version standard primary and secondary schools ventilation system design. Twenty schools strategically selected around the territory; including both primary and secondary schools were approached to conduct the indoor air quality survey. Subsequently, eleven schools granted permission. Considering the need of continuous measurement and to minimize disturbance to the class activities, automatic data loggers were used to provide real time monitoring and in-depth study of carbon dioxide concentration, temperature and relative humidity in the classrooms. The indoor air quality data collected at the schools are analysed. Results indicated that the capacities of window A/C units at the air-conditioned classrooms were insufficient to extract the moisture generated from breathing. Besides, the ventilation rates of exhaust (and air intake) fans at most air-conditioned schools were below ASHRAE's recommendations. According to the measured carbon dioxide concentrations at the natural ventilated schools, the ventilation rates were generally in order. However, the temperature and humidity at the classrooms were either close to the boundary or out of the comfort zone as defined in ASHRAE Standard 55-1981, especially during the summer season. Apart from the physical measured data, information from questionnaires returned by the students have been tested with the Statistical Package for the Social Sciences (SPSS) programme. The students' subjective evaluation of the indoor air quality and environmental parameters are found to be generally in-line with the indoor climatologic measurements. Finally, an overview of existing schools' ventilation design and recommendations on the possible improvements are given in Chapter 8. Moreover, an introduction to the Year 2000 version standard primary and secondary schools has been included as part of the research work. |
| Author |
Yeung, Ching-ying, Ellen |
| Title |
Survey on end-user satisfaction with end-user computing |
| Department | Dept. of Management |
| Year | 1993 |
| Subject |
End-user computing Consumer satisfaction Hong Kong Polytechnic -- Dissertations |
| Degree | M.B.A. |
| Pages | xii, 128 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1150944 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/879 |
| Abstract | This report is an exploratory study of end-user satisfaction on end-user computing (EUC) strategies. This study, based on data collected from 190 end-users in 16 organizations in Hong Kong and interviews with 8 IC managers. It has examined the end-user computing strategies, organization structures relating to end-user computing, EUC support functions and individuals characteristics that affecting the success of EUC and the end-user satisfaction. The research findings have revealed that a hybrid of monopolistic and acceleration strategies is often found in the selected large organizations in Hong Kong. Control and support are accomplished by setting guidelines in selection of hardware and software; training on "usage of application" packages and help-desk. MIS department has lost its veto power over the choice of computing equipment and software. A key result from the findings is that end-user satisfaction level is positively and significantly related to the satisfaction level on the IC services and supports (Cross Table 1.3). The results also show that a higher level of support is perceived by female and those respondents over 35 years old (Cross Table 2.1 & 4.1); whereas education level and classification of users are negatively and significantly related to the feeling of support provided in the company (Cross Table 3.1 & 5.1). Other findings have indicated no significant relationship between end-user satisfaction and feeling on the level of support (Cross Table 1.1), feeling on the level of control (Cross Table 1.2), processing of request (Cross Table 1.5), range of products (Cross Table 1.6), sex (Cross Table 2.3), education level (Cross Table 3.3), and classification of users (Cross Table 5.3). Some common key challenges to IC managers in Hong Kong are: managing wide diversity of user demand, understanding user requirement, keeping with rapid change in computer technology; and gaining and retaining management support. The success factors of IC's include: developing policies and guidelines for end-user computing, getting user involvement and commitment, enforcing company standards as far as possible and realizing the importance of end-user computing by the top management. |
| Author |
Kan, Jing-tong Jeanneton |
| Title |
A survey on how CRE/FM in the financial services sector is responding to sustainable development |
| Department | Dept. of Building Services Engineering |
| Year | 2009 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Sustainable development -- China -- Hong Kong Facility management -- Environmental aspects -- China -- Hong Kong Banks and banking -- China -- Hong Kong |
| Degree | M.Sc. |
| Pages | 95 p. : ill. ; 31 cm. |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b2356485 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/5833 |
| Abstract | Much anxiety has been created in recent decades regarding the deterioration of our environment attributed to the climate crisis. The environmental impacts of ongoing economic globalization have aroused the awareness of the crucial role played by enterprises in attributing to the environmental implications due to a lot of economic activities occurring within corporations. The government cannot work on standalone efforts to save the environment without the assistance supplemented by private and public corporations. Sustainability can be examined in the global, country and organizational context. The purpose of this dissertation is to focus on the organizational level and to explore the extent to which corporations in the financial services sector are responding to sustainability development. Several factors have been considered to assess corporate awareness of environmental sustainability, namely corporate commitment, strategic planning, sustainable policy and guidelines, communication, role of responsibility, performance reporting and procurement. These seven components are regarded in this study as the critical dimensions to evaluate the accomplishment of sustainability development in the financial service organizations. This study also attempts to consider the extent of CRE/FM involvement in assisting to implement sustainability in the corporate environment. The study concludes that measures aimed at sustainability development have been implemented in the financial service corporations. The environmental aspects mostly emphasized by corporations are energy management, waste management, and health and safety. However, the coverage of sustainable criteria is inadequate due to financial, building or other constraints, and a wider coverage is required. Corporations are continuing to strive to achieve the compatibility of economic globalisation and sustainable development. |
| Author |
Li, Siu-hung |
| Title |
A survey on self-assessment of hospital services using the Baldrige quality criteria |
| Department |
Multi-disciplinary Studies Dept. of Management |
| Year | 2000 |
| Subject |
Public hospitals -- China -- Hong Kong -- Administration Health services administration -- China -- Hong Kong Medical care -- China -- Hong Kong -- Quality control Total quality management -- China -- Hong Kong Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | iii, 58, [2] leaves : col. ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1569006 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/5031 |
| Abstract | To cope with the global changes in social-economic environment, health care organizations have to face tremendous challenges, such as aging population, new diseases patterns. On one hand health care costs are getting higher, but on the other hand, public are demanding more quality health services than ever. To meet such demand with limited resources, health care organizations have to improve both efficiency and effectiveness of health services. The establishment of Hospital Authority has created organization culture of quality. The application of TQM approach has been introduced and widely implemented in hospitals. It is believed that TQM will lead to higher quality services, better staff morale, lower the cost of service delivery, and increase customer satisfaction. Many health care organizations hence have adopted different models as framework for quality improvements. The study intents to examine the quality performance of a hospital by using Malcolm Baldrige National Quality Award criteria. The Baldrige Award has been credibility as a benchmarking assessment and improvement device. With reference to the Baldrige criteria, a simple questionnaire was designed to make a "snapshot" self-assessment of organizational excellence. It was a self-administered questionnaire which the reliability had been tested. Under each Baldrige subcategory, a five-point Likert scale was giving for rating. Questionnaires were sent out to a purposive sample of 68 managerial grade staff at a 800-beds acute hospital. They include doctors, nurses, allied health staff and administrators. 35 completed questionnaires were returned. Data analysis showed significant differences in sex and management experience against the level of agreement in quality performances of the hospital. The findings indicated that the overall hospital performance based on Baldrige criteria was above average. Comparatively, customer focus and satisfaction got the highest score whist human resource development and management was the lowest among the seven categories. These can be served as a baseline for the hospital management to make further improvement and strive for excellence services. The limitation of the study is delineated. |
| Author |
Lai, Yuen-shing Edward |
| Title |
A survey on the professional and organizational commitments of physiotherapists in Hong Kong |
| Department | Dept. of Management |
| Year | 2001 |
| Subject |
Hong Kong Polytechnic University -- Dissertations Physical therapists -- China -- Hong Kong Organizational commitment -- China -- Hong Kong |
| Degree | M.B.A. |
| Pages | vii, 61 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1611612 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/495 |
| Abstract | Surveys on the professional and organizational commitments had been performed in other countries to have better understanding of commitment in the workplace. However, no similar study had been conducted in the local context. This study investigated the levels and relationship of the professional and organizational commitments in physiotherapists in the local health care community. Ninety-six self-administered questionnaires were sent out to physiotherapists in six physiotherapy centers in Hong Kong. The return rate was 66.7 %. Results indicated that physiotherapists in the population had significantly higher professional commitment than organizational commitment in all the three commitment components, namely affective, continuance and normative commitments. In addition, there was no significant correlation between organizational and professional commitment in affective, normative and continuance components. These findings indicated that the respondents were able to maintain a high degree of professional commitment without perceiving undue conflict from the demands of the organization. In addition, employer are encouraged to formulate strategies to promote both professional and organizational commitments of its employees in order to further promote their job satisfaction and work performance. |
| Author |
Lai, Edward Tak-sing |
| Title |
A survey on the rehabilitative management for the anterior cruciate ligament (ACL) injuries in Hong Kong |
| Department | Multi-disciplinary Studies |
| Year | 1997 |
| Subject |
Anterior cruciate ligament -- Wounds and injuries -- Physical therapy Anterior cruciate ligament -- Wounds and injuries -- Patients -- Rehabilitation Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | viii, 98 leaves : ill. ; 30 cm |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b1410563 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/2846 |
| Abstract | Surveys on anterior cruciate ligament (ACL) rehabilitation have been performed in other countries to improve their management of ACL injuries. However, no similar study has been conducted in the local community. This study investigated the current clinical rehabilitative management of ACL injured patients in Hong Kong. Sixty-two self-administered questionnaires were sent to experienced physiotherapists in treating ACL patients in various physiotherapy centres in Hong Kong. The return rate was 87.1%. Results indicated that the progress of local rehabilitation for surgical ACL patients is comparable to the Accelerated Programmes in the literature. There is no obvious consensus on the rehabilitation protocol among non-surgical programmes. Rehabilitative equipment such as continuous passive motion, isokinetic machine and knee braces are not widely used by local clinicians. Return to preinjury sports is not a common outcome for non-surgically treated ACL patients and the criteria for returning the surgical ACL patients to preinjury sports are only used by a few centres. Open-kinetic chain exercise of quadriceps muscle at 90o to 0o knee flexion is initiated by most centres at 4 weeks post-operatively which is the most aggressive among all the existing programmes in the literature. Most clinicians regarded patient's motivation and compliance could influence clinical outcomes and further research is needed to improve ACL rehabilitation. |
| Author |
Zhang, Kaixuan Vicky |
| Title |
Sustainable buildings, energy efficiency and climate change : an investigation of financial & non-financial benefits from energy efficiency of sustainable buildings contribution factors to mitigate climate change : a survey in Shenzhen |
| Department | Dept. of Building and Real Estate |
| Year | 2011 |
| Subject |
Sustainable buildings. Building -- Cost effectiveness. Buildings -- Environmental aspects. Climatic changes -- Prevention. Construction industry -- Finance. Sustainable construction. Hong Kong Polytechnic University -- Dissertations |
| Degree | M.Sc. |
| Pages | ix, 119 p. : col. ill., col. maps ; 30 cm. |
| Language | English |
| OneSearch | https://www.lib.polyu.edu.hk/bib/b2462963 |
| URI: | http://theses.lib.polyu.edu.hk/handle/200/6329 |
| Abstract |
Climate change is becoming the more and more preeminent social, economic and environmental issue in contemporary society. And it may bring lots of negative impacts like global warming, sea rising, extreme weather and so on. There are two cause of climate change: nature and human activities. While we may not be able to do with nature, we could effectively manage human activities to mitigate climate change. Amongst thousands of various human activities, activities in building section are contributing 40 percent of energy consumption and one third of green house gas (GHG) emissions all over the world. So it is a huge potential opportunity to take measures to reduce the energy use and carbon emission in building sectors. And the best measure is energy efficiency of sustainable buildings. However, there's a false view that sustainable building costs significantly more than normal buildings. On the contrary, sustainability is the only way of conducting any businesses, now and in the future. There remains a payoff to building owners from more efficient management including facilities, operations and within firms through energy efficiency. Technology solutions and management capabilities have continued to advance, and so is it in this context of a changing world that a research into the financial benefit from greener buildings for owners and tenants, especially for developing country, typically like China. A survey and analysis of operating costs, energy impacts, productivity and tenant attitudes from a major real estate portfolio was conducted in this particular survey in Shenzhen. The results provided are based on a survey of 12 sustainable buildings and over 400 tenants who have moved into these buildings which are under managed as green properties. Results suggest that that many tenants concerned a lot about sustainable operations practices and policies. And some showed their views of higher productivity and less sick time. It was also noted that the average wages of employees in firms occupying sustainable buildings are higher than average. Analysis was conducted also on scientific reasons why healthier buildings with better air quality would result in less sick time from previous studies. And natural light is also correlated with positive feelings about work and productivity. The results observed higher occupancy rates and higher rents for future space in sustainable buildings, even though most tenants did not admit to being willing to pay more. Sustainable buildings typically use less electricity or energy and water, but other expense items may run more. Because sustainable buildings are more intensively managed that they can make savings on energy and water, therefore making the overall operating expenses are similar with non-sustainable buildings. When the building owners and the tenants are gaining or enjoying the financial benefits brought by energy efficiency of sustainable building, they may not be aware that these projects are as well as making tremendous contribution of mitigation of climate change all over the world. We humans should pay more attention on this part to take more actions to make the building around us greener and our life more green based on sustainable development. |