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계통상태를 고려한 ELF 전자계의 인체안전평가를 위한 퍼지언어변수 접근법
김상철,김두현,고은영 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2
This paper presents a study on the fuzzy linguistic variable based approach for safety assessment of human body in ELF electromagnetic field considering power system states. To cope with the demand in modern industry, the power system becomes larger in scale, higher in voltage. The advent of high voltage system has increased the relative importance of field effects. The analysis of ELF electromagnetic field based on Quasi-Static Method is introduced while the power system is included to model the expected and/or unexpected uncertainty caused by the load fluctuation and parameter changes. In order to analyze the power system, Monte Carlo simulation method and contingency analysis method are adopted in normal state and alert state, respectively. In the safety assessment of human body, the approach based on fuzzy linguistic variable is employed to overcome the shortcomings resulting from a crisp set concept. The suggested scheme is applied to a sample system(modified IEEE 14 bus system) to validate the usefulness.
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김상철,김선혜 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.4
The Existing Building Energy Optimization workshop aims to provide more resilient energy optimization solutions for existing buildings to all stakeholders. This paper introduces the recently developed Existing Building Energy Optimization workflow, into which 3D laser building scanning and the BIM2BEM have been added in order to increase productivity over the time-consuming and labor-intensive conventional energy optimization processes for existing buildings. This paper also demonstrates model calibration and suggests feasible ECMs for the exemplary building. It is author’s intent to share lessons from the workshop, that is, use of ICT tools will accelerate active collaboration between building service engineers and non-experts. Eventually the workshop workflow and lessons is used to formulate an educational curriculum of green building design and retrofit classes. Lastly the paper is enclosed with future research initiatives in developing an enhanced process or a harness toward the analysis-driven retrofit decision making. A value of these initiatives is found from increasing usability of the formalized expertise and appropriate localizations.
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김상철,김두현 한국산업안전학회 1993 한국안전학회지 Vol.8 No.3
This paper presents a study on the characteristics and safety criteria for human body in ELF(Extremely Low Frequency : 50∼60㎐) electric and magnetic fields. Many researches for ELF electric and magnetic fields, which are developed in the past, are studied and analyzed in this paper. In order to estabilish the safety criteria for human body in the field, the field intensity, induced current and voltage are calculated by the electrostatic field approach which is far simpler than the electromagnetic field one based on Maxwell equation. The method is applied to the 345 KV transmission line system in operation and 765 KV system under consideration. According to the results, the maximum value of field intensity, 6.8627KV/m, is evaluated at the location which is 14m away from transmission line. As the safety criteria value by the abroad researches asserting that the human can detect the induced current in 6KV/m and above, 5KV/m and 7KV/m are recommended at residence area and nonresidence area, respectively.
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김상철,한성홍,김의정,이충우,주종현,허민찬 한국물리학회 2005 새물리 Vol.50 No.2
TiO2 thin lms were prepared by using a sol-gel process and their structural and optical properties were examined at various calcination temperatures and catalyst concentrations. The XRD result for the TiO2 thin lm calcined at 400 C showed the anatase phase, that transformed into the rutile phase at 1000 C. The crystallite size of the lms increased with increasing catalyst concentration and calcination temperature, and all lms were fabricated uniformly. The lms had excellent density uniformity and crystallinity with increasing catalyst content and calcination temperature. The transmittances of the lms calcined at 800 C and 1000 C were reduced prominently in the wavelength range of 300 800 nm due to the absorption resulting from changes in the crystallite phase and the composition in the lm. The porosity of the TiO2 thin lms was decreased with increasing calcination temperature and catalyst content, and the absorption occurred at lower temperature with increasing catalyst content.
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부분 열처리한 기계 구조용 탄소강의 피로균열 전파에 관한 연구
김상철,김선용 한국산업안전학회 1993 한국안전학회지 Vol.8 No.1
It is well known that mechanisms of fracture and fatigue crack propagation depend upon various characteristics such as environmental condition, crack geometry, heat treatment and mechanical properties. It seems to be important for the detailed evaluation of structural integrity to investigate the effects of the above factors on the behavior of structural components which contain flaws. In this paper, it is studied that the fatigue crack propagation of partly heat treated medium carbon steel (SM45C) by high frequency heat treatment.
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