A simple method for calculating distance between a solid sphere and a constructive solid geometry (CSG) so lid primitive (including block, cone, cylinder, sphere, wedge and torus) is derived to support the collision ...A simple method for calculating distance between a solid sphere and a constructive solid geometry (CSG) so lid primitive (including block, cone, cylinder, sphere, wedge and torus) is derived to support the collision detection algorithm. By decomposing the whole space into relative positions and geometric features of the sphere and the primitive considered, closed form distance formula are got. These calculations are very useful in the real time collision detection in which primitives are used as bounding volumes of complex objects.展开更多
The reliability analysis, based on the reliability index method, of two dimensional slopes is generalized by taking Sarma′s acceleration as the performance function. That is to say, a general expression of the perfo...The reliability analysis, based on the reliability index method, of two dimensional slopes is generalized by taking Sarma′s acceleration as the performance function. That is to say, a general expression of the performance function is given under various kinds of slice methods, even under various shapes of slice partition, beyond the traditional vertical slice method. A simple example shows explicitly the relationship of four commonly used slice methods in the slope reliability analysis. It is also found that the results of the reliability analysis are basically consistent with those of the stability analysis based on Sarma′s method.展开更多
Ablation experiments of A950 Liquid Crystal Polymer (LCP), as a kind of typical matrix of fibre reinforced polymer composites, are carried out in this paper. Data on the ablation of A950 LCP by excimer laser at 24...Ablation experiments of A950 Liquid Crystal Polymer (LCP), as a kind of typical matrix of fibre reinforced polymer composites, are carried out in this paper. Data on the ablation of A950 LCP by excimer laser at 248 nm are presented. The experimental results show that the ablation depth is a linear function of the number of pulse at constant laser fluence, The ablation rate varies with the logorithm of the fluence in a linear manner at different fluences. A satisfactory linear relationship is found between ablation energy and incident fluence. Perhaps due to the plume absorption and thermal effect, the ablation rate varies complicatedly with pulse repetition frequency.展开更多
This paper is concerned with the work involved in improving the machining accuracy of a cantilever boring bar by on line compensation with a piezoelectric actuator. A boring bar is made into lever structure, with str...This paper is concerned with the work involved in improving the machining accuracy of a cantilever boring bar by on line compensation with a piezoelectric actuator. A boring bar is made into lever structure, with strain gauges attached to the bar for measuring its force induced deflections. The piezoelectric actuator is employed to compensate the deflections of the boring bar for accuracy improvement. Due to the mechanical advantage of the structure, the boring bar can be made into smaller size. The diameter of the bar implemented is 10 mm and the ratio of length to diameter (L/D) is larger than 8. It is found that the machining accuracy is improved considerably by using the piezoelectric actuator compensation system.展开更多
Strategic quality management is implemented in a local elevator company. Quality strategies, policies and goals focusing on customers′ needs are clearly established. Continuous quality improvement has been adopted as...Strategic quality management is implemented in a local elevator company. Quality strategies, policies and goals focusing on customers′ needs are clearly established. Continuous quality improvement has been adopted as the corporate strategy to improve its performance and competitive edge. This paper presents the successful implementation of a quality improvement project using the work study approach. On the completion of the project, the rate of serious defects which may lead to an accident is reduced by 55%, i.e., from 2%￣0.9% over a period of two years. A total of HK$ 1.1 million spent on the project is justified when compared with the reduction of financial risks involved. The success of the project demonstrates that the work study approach could be an effective tool for improving the performance of maintenance work.展开更多
ISO 9000 certification has been considered as an effective competitive edge for manufacturing industries. In Hong Kong, the ISO 9000 certification has been widely adopted and extended to service industries for the so...ISO 9000 certification has been considered as an effective competitive edge for manufacturing industries. In Hong Kong, the ISO 9000 certification has been widely adopted and extended to service industries for the sole purpose of enhancing corporate image. However, complaints have been voiced by many certified organizations about increasing paperwork, non direct labour and excessive resources channelled into non core business. This paper is to propound the integrated management system, a single management system focusing on business purpose yet being flexible enough to integrate the requirements of various management standards such as the ISO 9000, ISO 14000 and future ISO 18000. This paper describes how the proposed system could be implemented to achieve the desired business results.展开更多
Total quality management (TQM) is of strategic significance in winning the required edge for manufacturers in Hong Kong to survive in the ever increasingly competitive market. Mere capitalization on the cheap availa...Total quality management (TQM) is of strategic significance in winning the required edge for manufacturers in Hong Kong to survive in the ever increasingly competitive market. Mere capitalization on the cheap availability of labour and land in the China's Mainland for competitiveness is no longer viable because of the emergence of new competitors in particular those in Asia countries. TQM aiming for continuous improvements is the key for profitability growth and long run competitiveness. Over emphasis in the “hardware” for quality improvement without the complementation of it with the cultivation of the “software” for its implementation will not only delay the real implementation of real TQM but may also result in catastrophic failure of the organization in the face of rapid changes in demand and expectations of customers. An organizational culture for quality improvement through management empowerment is believed to be fruitful in helping the Hong Kong manufacturers to win the uphill battle for their well being and even survival in the world competition.展开更多
This paper discusses on the findings of a survey on the present perspective of quality mission among the ma nufacturing practitioners in Hong Kong. Further, the quality approaches and techniques adopted in Hong Kong ...This paper discusses on the findings of a survey on the present perspective of quality mission among the ma nufacturing practitioners in Hong Kong. Further, the quality approaches and techniques adopted in Hong Kong manufacturing to improve quality are looked into. The results of this study reveal that the present view on quality is to focus on customers, to improve the operational processes and to increase the total involvement among the staff in the company. In addition, it is found that the difference in working experience and types of industry would affect the perspective of quality as an individual and as a company to a certain extent. Moreover, it is interesting to find that SPC and QCC are widely used in manufacturing for controlling operational processes. TQM and ISO quality system are often adopted in large electronics companies. However, zero defect program is not common in the three industries while benchmarking emerged as a useful technique.展开更多
Managing quality has become a serious endeavor for many Hong Kong companies. Many forward looking chief executives recognize that effective quality management is of strategic importance to competing, winning and ret...Managing quality has become a serious endeavor for many Hong Kong companies. Many forward looking chief executives recognize that effective quality management is of strategic importance to competing, winning and retaining markets. In this respect, they have established their quality culture in order to unify the workforce and the management for better quality performance. This paper is to study the styles of quality culture in some best companies in Hong Kong.展开更多
文摘A simple method for calculating distance between a solid sphere and a constructive solid geometry (CSG) so lid primitive (including block, cone, cylinder, sphere, wedge and torus) is derived to support the collision detection algorithm. By decomposing the whole space into relative positions and geometric features of the sphere and the primitive considered, closed form distance formula are got. These calculations are very useful in the real time collision detection in which primitives are used as bounding volumes of complex objects.
文摘The reliability analysis, based on the reliability index method, of two dimensional slopes is generalized by taking Sarma′s acceleration as the performance function. That is to say, a general expression of the performance function is given under various kinds of slice methods, even under various shapes of slice partition, beyond the traditional vertical slice method. A simple example shows explicitly the relationship of four commonly used slice methods in the slope reliability analysis. It is also found that the results of the reliability analysis are basically consistent with those of the stability analysis based on Sarma′s method.
文摘Ablation experiments of A950 Liquid Crystal Polymer (LCP), as a kind of typical matrix of fibre reinforced polymer composites, are carried out in this paper. Data on the ablation of A950 LCP by excimer laser at 248 nm are presented. The experimental results show that the ablation depth is a linear function of the number of pulse at constant laser fluence, The ablation rate varies with the logorithm of the fluence in a linear manner at different fluences. A satisfactory linear relationship is found between ablation energy and incident fluence. Perhaps due to the plume absorption and thermal effect, the ablation rate varies complicatedly with pulse repetition frequency.
文摘This paper is concerned with the work involved in improving the machining accuracy of a cantilever boring bar by on line compensation with a piezoelectric actuator. A boring bar is made into lever structure, with strain gauges attached to the bar for measuring its force induced deflections. The piezoelectric actuator is employed to compensate the deflections of the boring bar for accuracy improvement. Due to the mechanical advantage of the structure, the boring bar can be made into smaller size. The diameter of the bar implemented is 10 mm and the ratio of length to diameter (L/D) is larger than 8. It is found that the machining accuracy is improved considerably by using the piezoelectric actuator compensation system.
文摘Strategic quality management is implemented in a local elevator company. Quality strategies, policies and goals focusing on customers′ needs are clearly established. Continuous quality improvement has been adopted as the corporate strategy to improve its performance and competitive edge. This paper presents the successful implementation of a quality improvement project using the work study approach. On the completion of the project, the rate of serious defects which may lead to an accident is reduced by 55%, i.e., from 2%￣0.9% over a period of two years. A total of HK$ 1.1 million spent on the project is justified when compared with the reduction of financial risks involved. The success of the project demonstrates that the work study approach could be an effective tool for improving the performance of maintenance work.
文摘ISO 9000 certification has been considered as an effective competitive edge for manufacturing industries. In Hong Kong, the ISO 9000 certification has been widely adopted and extended to service industries for the sole purpose of enhancing corporate image. However, complaints have been voiced by many certified organizations about increasing paperwork, non direct labour and excessive resources channelled into non core business. This paper is to propound the integrated management system, a single management system focusing on business purpose yet being flexible enough to integrate the requirements of various management standards such as the ISO 9000, ISO 14000 and future ISO 18000. This paper describes how the proposed system could be implemented to achieve the desired business results.
文摘Total quality management (TQM) is of strategic significance in winning the required edge for manufacturers in Hong Kong to survive in the ever increasingly competitive market. Mere capitalization on the cheap availability of labour and land in the China's Mainland for competitiveness is no longer viable because of the emergence of new competitors in particular those in Asia countries. TQM aiming for continuous improvements is the key for profitability growth and long run competitiveness. Over emphasis in the “hardware” for quality improvement without the complementation of it with the cultivation of the “software” for its implementation will not only delay the real implementation of real TQM but may also result in catastrophic failure of the organization in the face of rapid changes in demand and expectations of customers. An organizational culture for quality improvement through management empowerment is believed to be fruitful in helping the Hong Kong manufacturers to win the uphill battle for their well being and even survival in the world competition.
文摘This paper discusses on the findings of a survey on the present perspective of quality mission among the ma nufacturing practitioners in Hong Kong. Further, the quality approaches and techniques adopted in Hong Kong manufacturing to improve quality are looked into. The results of this study reveal that the present view on quality is to focus on customers, to improve the operational processes and to increase the total involvement among the staff in the company. In addition, it is found that the difference in working experience and types of industry would affect the perspective of quality as an individual and as a company to a certain extent. Moreover, it is interesting to find that SPC and QCC are widely used in manufacturing for controlling operational processes. TQM and ISO quality system are often adopted in large electronics companies. However, zero defect program is not common in the three industries while benchmarking emerged as a useful technique.
文摘Managing quality has become a serious endeavor for many Hong Kong companies. Many forward looking chief executives recognize that effective quality management is of strategic importance to competing, winning and retaining markets. In this respect, they have established their quality culture in order to unify the workforce and the management for better quality performance. This paper is to study the styles of quality culture in some best companies in Hong Kong.
