HKUST Institutional Repository
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Repository of Hong Kong University of Science and Technology. Managed by the HKUST Library.
Mostrando recursos 1 - 20 de 27
1.
Virtual prototyping for customized product development - Tseng, Mitchell M.; Jiao, Jianxin; Su, Chuan-Jun
Customized product development is facing the challenges of maintaining mass producibility and exploring customer perception on target products. This paper reports an approach by combining virtual prototyping (VP) with design by manufacturing simulation techniques. By constructing virtual prototypes, accurate assessments of mass producibility and customer acceptance will enable better informed design of customized products. The primary goal of VP for customized product development is to provide a multidisciplinary design definition and rapid prototyping environment for concept development and a tailored, scenario-based simulation environment for concept evaluation within a single facility. This design environment facilitates the capture and utilization of information...
2.
Fundamentals of product family architecture - Tseng, Mitchell M.; Jiao, Jianxin
Recognizing the rationale of a product family architecture (PFA) with respect to design for mass customization (DFMC), this paper discusses the fundamental issues underlying a PFA, including product information modeling, structural implications of product families, functional variety versus technical variety, class-member relationships inherent in variety, modularity and commonality, PFA design spaces, and PFA composition. The background research is reviewed in terms of product architecture and modularity, product platform and product families, and product modeling and design process models. To organize product varieties in DFMC, a PFA should be described from three different perspectives, namely the functional (as seen from customer,...
3.
Concurrent design for mass customization - Tseng, Mitchell M.; Jiao, Jianxin
Mass customization aims at satisfying individual customer needs while keeping mass production efficiency. This paper discusses the employment of concurrent engineering for realizing mass customization. Concurrent design for mass customization (CDFMC) is put forward by extending the traditional boundaries of product design to encompass a larger scope spanning from sales and marketing to distribution and services. In addition, CDFMC advocates designing product families instead of individual products. The paper develops a concept of product family architecture (PFA) to support CDFMC via assisting different functional departments within a manufacturing enterprise to work together cohesively. The rationality of CDFMC lies in synchronizing...
4.
The Migration of electronic commerce (EC): from planning to assessing the impact of EC on supply chain - Yen, Benjamin P.-C.; Ng, Elsie O. S.
It has been an increasing trend for companies to migrate their businesses onto or publicize themselves on the Internet. Business process reengineering (BPR) is applied to migrate the business processes of the supply chain onto the Web. Such migration may cause some of the processes merged together, minimized or transformed into other processes within a supply chain. Therefore, careful planning for such migration with technical requirements is necessary. This paper starts with the review of related research on BPR, migration of supply chain onto the Internet, and the impact analysis of the migration. A thorough overview of how BPR can...
5.
A pragmatic approach to product costing based on standard time estimation - Jiao, Jianxin; Tseng, Mitchell M.
Proposes a pragmatic approach to product costing. The approach involves two stages, namely the preparatory stage and the production stage. In the preparatory stage, standard routings are first extracted from existing products. A generic activity hierarchy is established according to the analysis of standard routings, where cost drivers for each activity are identified and summarized by appropriate Cost-related Design Features (CDFs). Then the Maynard Operation Sequence Technique (MOST) is employed to analyze each operation of standard routings to determine the associated standard time. Historical cost data are analyzed to induce the relationships between the CDFs and standard time, namely Time-Estimating...
6.
A requirement management database system for product definition - Jiao, Jianxin; Tseng, Mitchell M.
This paper presents a database system developed to provide a computerized environment for requirement management during the product definition phase. The scope of this database system is to facilitate and demonstrate a methodology for product definition by recognizing and adopting functional requirement patterns from previous product designs so as to address a broad spectrum of domain-specific customer requirements and organize requirement information for product specifications. The database system improves the product definition process during design and redesign efforts by integrating customer and design information all together and by reusing this information. A prototype requirement management database system is implemented on...
7.
Mapping customers' service experience for operations improvement - Tseng, Mitchell M.; Ma, Qinhai; Su, Chuan-Jun
The growing importance of the service sector in almost every economy in the world has created a significant amount of interest in service operations. In practice, many service sectors have sought and made use of various enhancement programs to improve their operations and performance in an attempt to hold competitive success. As most researchers recognize, service operations link with customers. The customers as participants act in the service operations system driven by the goal of sufficing his/her added values. This is one of the distinctive features of service production and consumption. In the paper, first, we propose the idea of...
8.
Identifying customer need patterns for customization and personalization - Du, Xuehong; Jiao, Jianxin; Tseng, Mitchell M.
The importance of incorporating customer preferences into product specifications for successful customized product design has been well recognized. An approach based on the identification of customer need patterns is proposed in this paper for better understanding of customer preferences and accordingly to enhance the product definition for customization and personalization. A tree-structured classification algorithm is formulated for the identification of customer need patterns. Accordingly, a two-phase methodology is developed for effective product definition. A case study of power supply products is reported to illustrate the feasibility and potential of the proposed approach.
9.
Analysis and design of polysilicon thermal flexure actuator - Huang, Qing-An; Lee, Neville Ka-Shek
An analytical model that can accurately predict the performance of a polysilicon thermal flexure actuator has been developed. This model is based on an electrothermal analysis of the actuator, incorporating conduction heat transfer. Heat radiation from the hot arm of the actuator to the cold arm is also estimated. Results indicate that heat radiation becomes significant only at high input power, and conduction heat losses to both the substrate and the anchor are mainly responsible for the operating temperature of the actuator under routine operations. Actuator deflection is computed based on elastic analysis of structures. To verify the validity of...
10.
High-resolution multidimensional displacement monitoring system - Lee, Neville Ka-Shek; Cai, Yimin; Joneja, Ajay
The possibility of using quadrant detectors to develop a new optical system that can monitor all six degrees of freedom of mechanica workpieces with very high resolution is investigated. A prototype system based on this approach has been designed and built. Although the system is not fully optimized, our proposed system has already demonstrated some promising results. Using a thermally compensated laser source together with a pinhole spatial filtering system, we have demonstrated that lateral resolution better than 50 nm and angular displacement resolution better than 0.25 ?rad is achievable with this system.
11.
Geometric reasoning for optimizing backward growing-based feature recognition - Joneja, Ajay
Feature recognition has been a weak link in most implementations of integrated CAD/CAM systems for machining. A method called Backward Growing was recently suggested as a simple, but effective means to recognize machining features from the boundary representation (brep) of a designed part. The method promises, through its simplicity, to be applicable to many varieties of machined shapes. However, it has some drawbacks which create difficulties in making intelligent decisions about machining of shapes. In this work, we deal with two such difficulties, and propose a methodology of solving them. We also present some of the work done in implementing...
12.
Automated configuration of parametric feeding tools for mass customization - Joneja, Ajay; Lee, Neville Ka-Shek
Mass customization is a dominant new trend in modern manufacturing, whereby industries are required to produce umpteen variations of products at costs approaching those achievable in mass production. Among the methods to tackle this demand is development of flexible tooling which operates at high throughput rates. A suite of such tools called MPATS (a Modular, Parametric, Assembly Tool Set) is developed for this. The paper introduces MPATS, and also describes a computer-aided planning system to automatically configure MPATS.
14.
A metric to quantify virtual scene movement for the study of cybersickness : definition, implementation, and verification - Lo, W. T.; So, Richard H. Y.
This paper presents a metric to quantify visual scene movement presented during a virtual reality simulation and illustrates how this could assist future studies of cybersickness. Virtual reality systems can cause cybersickness. 'Sensory conflict theories' predict that cybersickness is a kind of visually-induced motion sickness. However, there are very few measures to quantify the visual stimuli presented during a virtual reality simulation session and existing methods are mostly labor intensive. A metric, referred to as 'spatial velocity', is proposed. It combines measures of scene complexity (i.e., 'spatial frequencies') and measures of scene movement speed (i.e., 'scene velocities (SV)'). The theoretical...
15.
Cybersickness in the presence of scene rotational movements in different axes - Lo, W. T.; So, Richard H. Y.
Compelling scene movements in a virtual reality (VR) system can cause symptoms of motion sickness (i.e., cybersickness). A study has been conducted to investigate the effects of scene oscillations in different axes on the level of cybersickness. Sixteen male were exposed to four 20-minute VR simulation sessions with at least seven-day separation between consecutive exposures. The four sessions used the same virtual environment with scene oscillations in different axes: pitch, yaw, roll and no oscillation (speed: 30°/s, range: +/-60°). Verbal ratings of nausea level were taken at 5-minute intervals and sickness symptoms were measured before and after the exposure using...
16.
A methodology of developing Product Family Architecture for mass customization - Jiao, Jianxin; Tseng, Mitchell M.
Mass customization, aiming at delivering an increasing product variety that best serves customer needs while keeping mass production efficiency, has recently received numerous attention and popularity in industry and academia alike. This paper presents a methodology of developing Product Family Architecture (PFA) to rationalize product development for mass customization. Systematic steps are developed to formulate a PFA in terms of functional, technical, and physical views. The diverse needs of customers are matched with the capabilities of a firm through systematic planning of modularity in three consecutive views. The development of a PFA provides a unifying integration platform to synchronize market...
17.
Product family modeling and design support : an approach based on graph rewriting systems - Du, Xuehong; Jiao, Jianxin; Tseng, Mitchell M.
Earlier research on product family design (PFD) often highlights isolated and successful empirical studies with a limited attempt to explore the modeling and design support issues surrounding this economically important class of engineering design problems. This paper proposes a graph rewriting system to organize product family data according to the underpinning logic and to model product derivation mechanisms for PFD. It represents the structural and behavioral aspects of product families as family graphs and related graph operations, respectively. The derivation of product variants becomes a graph rewriting process, in which family graphs are transformed to variant graphs by applying appropriate...
18.
A methodology to determine the optimum seat depth - Goonetilleke, Ravindra S.; Song, Feizhou
Even though the seat pan carries most of the weight during sitting, the number of studies investigating the different aspects of the sitting area are limited. Seat depth has been based on anthropometry or the so-called industry practice. The relevance of the widely used seat depth measure is thus questionable. A methodology has been developed to evaluate the useful seat depth for a target population. The methodology is found to be reliable and valid based on both objective and subjective measurements. A chair with an 'adjustable' seat depth was designed and developed for this purpose. A total of 30 Chinese...
19.
On the SPH-distribution class - Shi, Dinghua; Guo, Jinli; Liu, Liming
Following up Neuts idea, the SPH-distribution class associated with bounded Q matrices for infinite Markov chains is defined. The main result in this paper is to characterize the SPH class through the derivatives of the distribution functions. Based on the characterization theorem, closure properties, the expansion, uniform approximation, and the matrix representations of the SPH class are also discussed by the derivatives of the distribution functions at origin.
20.
Foot measurements from three-dimensional scans : a comparison and evaluation of different methods - Witana, Channa P.; Xiong, Shuping; Zhao, Jianhui; Goonetilleke, Ravindra S.
An approach to automatic foot measurement using 3D scanned data is proposed in this paper. The proposed approach was evaluated through comparisons of simulated measurements (SM) of eleven male and nine female participants with manual measurements and with the output of a commercially available automated foot measuring system (CP). The registration procedure for the measurements and unambiguous definitions for each measurement were first established. Eighteen dimensions of each foot were calculated from the scanned data that comprised point clouds and selected landmarks. Two operators manually measured each participants foot twice. These manual measurements (MM) showed high inter- and intra-operator reliability...
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