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The Use of a Multiple Risk Level Model to Tackle the Duration of Risk for Construction Activity
Hsien-Kuan Chang,Wen-der Yu,Shao-Tsai Cheng,Tao-Ming Cheng 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
The project evaluation and review technique (PERT) is the most well-known method to handle the risk due to uncertain activity durations, previous studies show that the β-distribution-based PERT estimation tends to be over-optimistic and it offers no control of the project in terms of risk duration. This study proposes a multiple risk-level (MRL) model that uses a site spatial constraint, environmental effects and the “5 Ms” of construction management to tackle the duration of risk during a construction project. A Risk-based Critical Path Scheduling Method (R-CPSM) that uses MRL is developed to calculate the duration of the project. A case study using a project selected from a previous study is used to compare the four estimation methods: two traditional PERT methods (3.2σs and 6σs), a Monte Carlo Simulation and the proposed MRL model. The results show that, compared with traditional approaches to estimate durations of uncertain activity, the proposed R-CPSM method is more systematic that can be combined with a cost estimation process and offers a rectification mechanism that dynamically monitors and adjusts the important factors that affect the risk duration. This method gives a more realistic estimate that is in agreement with the results of previous studies.
Yu Cheng Lin,Chih Hung Tsai,Rong Kwei Li,Ching Piao Chen,Hsien Ching Chen 한국품질경영학회 2008 The Asian Journal on Quality Vol.9 No.3
The definition of cycle time is the time from the wafer start to the wafer output. It usually takes one or two months to get the product since customer decides to produce it. The cycle time is a critical factor for customer satisfaction because it represents the response time to the market. Long cycle time reflects the ineffective investment for the capital. The cycle time is very important for foundry because long cycle time will cause customer unsatisfied and the order loss. Consequently, all of the foundries put lots of human source in the cycle time improvement. Usually, we make decisions based on the experience in the cycle time management. We have no mechanism or theory for cycle time management. We do work-in-process (WIP) management based on turn rate and standard WIP (STD WIP) set by experiences. But the experience didn`t mean the optimal solution, when the situation changed, the cycle time or the standard WIP will also be changed. The experience will not always be applicable. If we only have the experience and no mechanism, management will not be work out. After interview several foundry fab managers, all of the fab can`t reflect the situation. That is, all of them will have an impact period after product mix or utilization varied. In this study, we want to develop a formula for standard WIP and use statistical process control (SPC) concept to set WIP upper/lower limit level. When WIP exceed the limit level, it will trigger action plans to compensate WIP Profile. If WIP Profile balances, we don`t need too much WIP. So WIP level could be reduced and cycle time also could be reduced.
Lung Tsai,A-Cheng Wang,Shih-Hsien Chou,Cheng-Jun Zhong 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Self-sharpening effect creates good abrasive performance in magnetic abrasive finishing (MAF); however, abrasive is easily flown away by the centrifugal force, reducing the finishing efficiency in MAF. Therefore, a novel polishing effect of flexible self-sharpening was demonstrated to reveal the excellent abilities in magnetic finishing with abrasive gel (MFGA), and grey relational method based on Taguchi experimental data was applied to obtain the optimal parameters in MFGA. In this paper, a cylindrical rod was finished with silicone gel to compare the MR and SR to those without this medium, and showed the flexible self-sharpening effect in MFGA. The results displayed that high temperature of the gel abrasive (exceeded 110oC) during polishing effect induced slow motion of the gel in the working area; hence, old abrasives would be pushed outside the working area during the motion of workpiece and flow motion of gel would pull the new abrasives into the polishing area, creating flexible self-sharpening effect in MFGA. Furthermore, from the grey relational analysis, the best experimental combination of the influential factors was presented; additionally, based on the analysis of variance,concentration of steel grit, machining time and kinds of abrasive dominate the behaviors of MFGA process.
Lin, Yu-Cheng,Tsai, Chih-Hung,Li, Rong-Kwei,Chen, Ching-Piao,Chen, Hsien-Ching The Korean Society for Quality Management 2008 The Asian Journal on Quality Vol.9 No.3
The definition of cycle time is the time from the wafer start to the wafer output. It usually takes one or two months to get the product since customer decides to produce it. The cycle time is a critical factor for customer satisfaction because it represents the response time to the market. Long cycle time reflects the ineffective investment for the capital. The cycle time is very important for foundry because long cycle time will cause customer unsatisfied and the order loss. Consequently, all of the foundries put lots of human source in the cycle time improvement. Usually, we make decisions based on the experience in the cycle time management. We have no mechanism or theory for cycle time management. We do work-in-process (WIP) management based on turn rate and standard WIP (STD WIP) set by experiences. But the experience didn't mean the optimal solution, when the situation changed, the cycle time or the standard WIP will also be changed. The experience will not always be applicable. If we only have the experience and no mechanism, management will not be work out. After interview several foundry fab managers, all of the fab can't reflect the situation. That is, all of them will have an impact period after product mix or utilization varied. In this study, we want to develop a formula for standard WIP and use statistical process control (SPC) concept to set WIP upper/lower limit level. When WIP exceed the limit level, it will trigger action plans to compensate WIP Profile. If WIP Profile balances, we don't need too much WIP. So WIP level could be reduced and cycle time also could be reduced.
DESTINATION BRAND COOLNESS: CONCEPTUALIZATION AND SCALE DEVELOPMENT
Hsiu-Yu Teng,Cheng-Hsien Tsai,Chia-Wen Hung,Hui-Chen Hung 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
Destination branding has become an important trend in modern tourism. The development of destination brands has become a strategic tool worldwide because of the growing competition between destinations. In recent years, many tourist destinations have combined unique, creative, and attractive elements to transform themselves into “cool” tourist destinations. Destination brand coolness refers to tourists’ subjective and positive perception of tourist destinations and their beliefs that the destination brand offer distinctive, novel characteristics and attributes that the visitors are attracted to. Creating destination brand coolness can help tourist destinations differentiate themselves from their competitive counterparts, thereby attracting tourists. However, no study has conceptualized the construct of destination brand coolness, let alone developing scales that measure destination brand coolness.