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Viability Analysis of Innovative Surface Stripe Removal System
이태식,문덕수,Leonhard E. Bernold,이동욱,구자경 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.1
Colored markings on surfaces travelled by cars, trucks and even airplanes not only provide visual guidance to the operator but also leave space for emergency vehicles. The marked road stripes on the roads should be timely or suddenly repainted in accordance with road maintenance, reconstruction, and other environmental situations. When the road surface marking are removed and remarked,the road surface are commonly damaged and aged by the mechanical or heating. This paper presents an alternative technology for removing the stripes, which promises not only to speed up but also improve the safety of the process. After a review of current methods, the results of the designing and testing a semi-automated operation that employs CO_2 will be discussed. Finally, the data collected during field testing the prototype is used to assess its economic viability based on a comparative cost analysis.
Dynamic Control of Resource Logistics Quality to Eliminate Process Waste in Rebar Placement Work
Sungkon Moon,Payam R. Zekavat,Leonhard E. Bernold,Pekka Leviakangas 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
Output-oriented resource control in the traditional planning methods is still prevalent in construction industry. It frequently causes unpredictable wastes leading to deterioration of the sequenced supply chains. On the other hand, the use of feed-forward control offers the opportunity for prevention by ensuring the high quality of necessary process resources. This paper, in turn, presents a dynamic control approach that highlights the effectiveness of feed-forward control on minimising process wastes. The field experiment in this paper presents the rebar supply and placement on an actual construction site. It aims to measure the responsiveness of pre-controlled resources to ever-changing process performance. Collected data during this field study provided the basic data for establishing statistical relationships between resource logistics quality and process performance. The research experiments found out two of the critical resource logistics: (1) Available number of workers; and (2) Distance between resource and final place. Finally the proactive control on these entities resulted in a dramatic reduction of process waste, leading to the improvement of productive work rate (31.0 to 53.3%). The main contribution of the research lies on the first-hand investigation from a very probable situation, which would benefit practical engineers and construction managers.
스페이스 엘리베이터 개발을 위해 적용 가능한 철도기술 제안에 관한 연구
박찬송(Chan Song Park),장병철(Byung Chul Chang),레온하드 버놀드(Leonhard E. Bernold),이태식(Tai Sik Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Space Elevator introduced in the science fiction titled "The Fountatins of Paradise" by Arthur C. Clarke in 1979 could be attainable for the transportation of human and distribution from earth to space. Space Elevator could reduce shipping expenses and risks of the transportation system. Developing Space Elevator has to need rail technologies for the train and the rail using Carbon nanotube cable, installation of rail appropriated for Earth-orbiting. For this reason, rail technologies for developing Space Elevator will be suggested by this study through the case study.