Koh Teck Hong
Email Address
mpekth@nus.edu.sg
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Publication Design analysis of the propulsion and control system of an underactuated remotely operated vehicle using axiomatic design theory - Part 1(2005-04) Koh, T.H.; Tay, F.E.H.; Lau, M.W.S.; Low, E.; Seet, G.; MECHANICAL ENGINEERINGIn this paper, the system design issues of the Propulsion and Control System of the ROV II are analyzed and addressed. The design concept, some of the upgraded features of the ROV II in comparison to ROV I and the unified pilot training and control system developed, will also be briefly discussed in this paper. © World Scientific Publishing Company.Publication Development of a semi-quantitative pre-LCA tool(1999-05-19) Ong, S.K.; Koh, T.H.; Nee, A.Y.C.; MECHANICAL & PRODUCTION ENGINEERINGThis paper describes the development of a semi-quantitative pre-LCA (life-cycle assessment) tool for assessing the environmental impacts of the production of a printer. This tool provides a quick-and-easy means of assessing the environmental impacts of a complex product, where a full LCA evaluation of the complex product would often require extensive calculations and the analysis is very time-consuming and places a heavy burden on the designer. The tool allows a designer to easily compute a total environmental impact value for each of the various alternative designs. The pre-LCA tool computes an environmental impact value by considering factors such as airborne and waterborne emissions, the recyclability potential, waste disposal, the global warming factor, the energy content of raw materials, the divertible plastic waste potential, etc. The analytical hierarchy comparison method is used for the designers to indicate the relative importance of these factors with respect to their designs. Environmental values for the various factors are calculated from graphs that have been derived based on extensive interviews with engineers involved in the production process, as well as from literature research.Publication Location and sensitivity comparison of MEMS accelerometers in signal identification for ambulatory monitoring(2004) Nyan, M.N.; Tay, F.E.H.; Koh, T.H.; Sitoh, Y.Y.; Tan, K.L.; MECHANICAL ENGINEERINGThis paper will present the comparison of experimental results for different sensitivity in the usage of MEMS accelerometers based on the eigenvector-based signal identification algorithm for multi-dimensional signal identification related to daily activities. Experimental results from sensors mounted on different locations on the human body will also be presented and discussed.Publication Smart shirt that can call for help after a fall(2005-04) Tay, F.E.H.; Nyan, M.N.; Koh, T.H.; Seah, K.H.W.; Sitoh, Y.Y.; MECHANICAL ENGINEERINGA smart shirt was developed for geriatric Healthcare purposes. It can summon medical assistances via SMS and e-mail when its bearer has fallen. Single axis accelerometers are arranged in mediolateral, vertical and antero-posterior direction on the shoulder part of the shirt. Using Bluetooth™ transmitter/receiver, signals are transmitted and processed on a Personal Computer (PC) for fall-detection. Upon detection of falls, SMS (Short Messaging Service) and e-mail are sent through GSM (Global System for Mobile Communication) network supported by a local telecommunication service provider. The primary advantage of our detection system compared to other researchers' systems is that fall notification can be sent to individuals and medical health care unit simultaneously to lead to a shortened interval of the arrival of assistance. © World Scientific Publishing Company.Publication Design analysis of the propulsion and control system of an underactuated remotely operated vehicle using axiomatic design theory - Part 2(2005-04) Koh, T.H.; Tay, F.E.H.; Lau, M.W.S.; Low, E.; Seet, G.; MECHANICAL ENGINEERINGIn this paper, Axiomatic Design (AD) theory was adopted for the design analysis of an underactuated Remotely Operated Vehicle (ROV) system and its subcomponents. The system design issues of the Propulsion and Control System of the ROV II are analyzed and addressed based on the Independence Axiom methodology. The top-level Functional Requirements (FRs) for the thruster design and configuration are identified and its corresponding Design Parameters (DPs) are also presented. © World Scientific Publishing Company.Publication Assessing the environmental impact of materials processing techniques using an analytical hierarchy process method(2001-06-15) Ong, S.K; Koh, T.H; Nee, A.Y.C; MECHANICAL ENGINEERINGAlthough many life cycle assessment (LCA) software tools are available, most tools can either address the needs of a specific product or a general industry range, but not both. This calls for the development of an easy-to-use and interactive Pre-LCA tool that would allow users to customise and improve flexibility and efficiency. The analytic hierarchy process (AHP) method uses established procedures to capture the best rank from judgements, through the weighting and synthesising of the decision process, into a hierarchy which is compatible with a network synthesised with various dependencies. It compares alternatives, one at a time, in the context of priorities. For this research, the AHP method is used to derive a single environmental score based on process emissions for each of the products or alternatives evaluated. Based on these environmental scores, these products can be ranked with respect to their environmental merits. The AHP method is incorporated into the Pre-LCA tool to assign accurate environmental scores to products. This paper discusses this AHP model in the Pre-LCA system developed. The developed AHP model has been applied to a case study, which is a comparative study on polystyrene and porcelain plates. The results show that the developed system is able to provide sound evaluation. © 2001 Elsevier Science B.V.