An analysis for the causes of accidents of repair, maintenance, alteration and addition works in Hong Kong
ABSTRACT This study unveils causes of accidents in repair, maintenance, alteration and addition (RMAA) work. RMAA work is playing an increasingly important role in developed societies, including Hong Kong. Safety problems associated with RMAA work in Hong Kong has reached an alarming level. In view of rapid expansion of the RMAA sector and rising proportion of accidents in the construction industry, there is a pressing need to investigate causes of RMAA accidents. Structured interviews were conducted with RMAA contractors to explore causes of accidents in the RMAA sector. A two-round Delphi method with 13 safety experts was subsequently employed to verify the interview findings and rank the relative degree of importance for various causes of accidents. Accidents happen in RMAA work due to intersection of reasons. One of the root causes of accidents in RMAA works is low safety awareness of RMAA workers; however, wider organizational and industrial factors are not negligible. This study sheds light on why accidents happen in the RMAA sector. Only when the factors leading to accidents are identified can effective measures be made.
Conference Paper: An estimator based exploration engine for autonomous learning systems[Show abstract] [Hide abstract]
ABSTRACT: The problem of an intelligent system which acquires knowledge through active sensing is examined. Such a system can exert some control over the sensing apparatus in response to past sensor data and intelligent decision-making. A system consisting of a robotic arm, a fingertip sensor, and an intelligent controller is considered. When presented with an unknown object to be identified, the system intelligently explores the object so that convergence to an accurate shape representation is as fast as possible. The system thus `seeks' out the features which it finds most useful in its sensing task. The exploration technique estimates system unknowns with a Kalman filter. The technique is formulated in terms as general as possible, so that applications may be found for many forms of active sensing, and for learning problems not necessarily restricted to unknown shape representation, such as efficient problem solving or assemblySystems, Man, and Cybernetics, 1991. 'Decision Aiding for Complex Systems, Conference Proceedings., 1991 IEEE International Conference on; 11/1991
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ABSTRACT: Risk management (RM) should be implemented in construction projects to assure the achievement of project objectives, regardless of project size. This study aims to investigate RM in small projects in Singapore in terms of status, barriers and impact of RM on project performance. To achieve the objectives, a questionnaire survey was conducted and data were collected from 668 projects submitted by 34 companies. The analysis results indicated a relatively low level of RM implementation in small projects, and that “lack of time”, “lack of budget”, “low profit margin”, and “not economical” were prominent barriers. Also, the results reported the positive correlation between RM implementation and improvement in quality, cost and schedule performance of small projects, respectively. The findings of this study can provide an in-depth understanding of RM in small projects in Singapore and make benefits of RM convincing to the participants of small projects.International Journal of Project Management 02/2013; 32(1):116-124. · 1.53 Impact Factor
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ABSTRACT: This study examines fatalities of repair, maintenance, minor alteration, and addition (RMAA) works which occurred in Hong Kong between January 2000 and October 2011. A total of 119 RMAA fatalities were recorded. Particular emphasis was placed on fall from height accidents as they accounted for the vast majority of RMAA fatal accidents for the period. A cluster analysis was conducted on fall from height fatal cases. The cluster analysis clearly identified three groups of fall from height fatalities: (1) bamboo scaffolders aged between 25 and 34 who fell from external wall/facade in the beginning of weekdays; (2) miscellaneous workers aged between 45 and 54 who fell from other/unknown places in the end of weekdays; and (3) manual labour aged between 35 and 44 who fell at floor level/from floor openings in weekends. Unsafe process and improper procedures were the main unsafe condition leading to fatalities whereas safety belt not properly used was the main unsafe action leading to fatalities. Specific safety interventions were recommended for each of these groups to help avoid these fatalities.Safety Science. 01/2013; 51(1):85–93.