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표면 열전달 저항이 배제된 건물 벽체 열성능 현장 측정 기법
김승철,김상봉,나환선,Kim, Seungchul,Kim, Sangbong,Nah, Hwanseon 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.2
In this paper, a new experimental method to determine the thermal resistance of building wall was proposed by improving the heat flow method (HFM) based on the air-surface temperature ratio theory. This technique measures the thermal resistance of the wall excluding the inner and outer surface heat transfer resistance. Unlike conventional HFM, this value can be compared directly with the theoretical reference value. Its performance was verified using three mock-up structures with a theoretical thermal transmittance of 0.5, 3.3, and 0.18 W/㎡·K respectively. After measuring the variations in the temperature and heat transfer rate of the mock-ups for 383 hours, the thermal transmittances were determined to be 0.47, 3.10, and 0.18 W/㎡·K, which corresponded to errors of 5.2, 6.2 and 0.5%, respectively, compared to the theoretical values. It was concluded that this technique can directly compare the thermal resistance of the wall between the existent stage and initial stage after construction.
U-CDS의 자연환기를 위한 AirDam시스템의 효과에 대한 연구
김승철,신부현,오기대,Seungchul, Kim,Boohyun, Shin,Gidae, Oh 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2
Recently, there has been an increasing demand for electric equipment installed on the ground to be installed in an underground space. Accordingly, U-CDS (Underground-Compact Distribution Station) installed in the underground is supplied, and to improve its weak ventilation performance, an Airdam-type structure was applied and the effect was analyzed. As a result, the temperature around the transformer was reduced by up to 9.5 degrees, and the air flow increased by up to 1.17 m/s. Airdam structure can be supplied in the form of various sculptures because it is possible to design freely while maintaining its principle.
Precision Plasmonic Phase Spectroscopy for Next Generation Sensors
Seungchul Kim(김승철) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The strong confinement of surface plasmons’ optical fields at metal surfaces makes them highly sensitive to the structural shape and refractive index change of targets. This has made surface plasmon resonance a widely applicable sensing technique. Plasmonic metrology is primarily based on the spectral shift of the scattering intensity spectrum. Although broadband phase spectra are known to provide richer information on target samples as opposed to intensity spectra, direct acquisition of broadband phase spectra in plasmonics has been made difficult by the lack of highly stabilized light sources. we demonstrate that frequency-comb-referenced phase spectroscopy provides high speed, high resolution, and high linearity with respect to plasmonic rulers. Our realization of a fast and robust plasmonic ruler with picometre resolution makes it possible to obtain high-precision plasmonic phase spectroscopy for in-depth analysis of the dynamics of samples in nanoscopic volumes.
공동주택 강제 환기 시스템의 건물에너지 측면에서의 장기적 운영 방안에 관한 연구
김승철(Kim, SeungChul),윤종호(Yoon, JongHo),백남춘(Baek Nam Choon),신우철(Shin U Cheul) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
Because buildings recently built have been highly insulated and highly airtight, it is impossible to emit toxic substances from interior finishing materials only by natural ventilation. Therefore, they cause indoor air pollution and it may threaten the user"s health such as atopic dermatitis, bronchial asthma and (allergic) rhinitis. Domestically, users spend indoors 80 percent of their time of a day. With the increased interest in indoor air quality, the introduction of forced ventilation system for new-built apartment buildings has been legislated. However, toxic substances from indoor are mostly below there commended standard approximately 23 months later. Thus, this study has assumed the status of the apartment buildings 23 months later through a simulation, regarded CO2 as an exclusive indoor air pollution source. In the process of effectively eliminating the CO2, this study has also been conducted on an operating plan that can provide superior performance from the energy side.
특허 받은 소변컵을 이용하여 채집한 첫 소변과 중간소변 시료의 비교 평가
김승철(SeungChul Kim),김호성(HoSung Kim),김창욱(ChangUook Kim),표상신(SangShin Pyo) 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.6
일반적으로 의료기관에서 요로감염을 확인하기 위한 방법으로 요검사(urinalysis)와 항균제 감수성 검사가 포함된 소변배양(urine culture)을 시행한다. 소변 검체는 채집하기 전에 요도 및 회음부 주변을 소독하는 것이 중요하며, 첫 소변이 아닌 중간소변으로 채집하는 것이 중요하다. 첫 소변과 중간소변을 자동으로 쉽게 분리할 수 있는 특허컵(특허 제10-1732843호)을 발명하였고 이를 이용하여 특허컵과 일반컵을 비교 평가하였다. 특허컵으로 분리한 첫 소변(N=24), 중간소변(N=24)의 nitrite (P <0.001), WBC (P =0.005), 세균 colony수 (P =0.001), colony 양성률 (P =0.004) 으로 유의한 높은 수치를 얻었다. 이는 특허컵을 이용하여 분리한 첫 소변과 중간소변이 잘 분리되었음을 알 수 있다. 또한 특허컵을 이용하여 분리한 중간소변(N=24)이 일반컵을 이용하여 채집한 중간소변(N=24) 보다 세균 colony 수가 통계적으로 유의하게 많았다(평균 7.9개 vs 평균 4.0개, P =0.002). 이는 특허컵을 이용하여 분리한 중간소변이 일반컵을 이용하여 채집한 중간소변 보다 요로감염검사에 대해 민감도(sensitivity)가 높다는 것을 의미한다. In general, as a method to confirm a urinary tract infection (UTI) in a medical institutions, urine culture including a urinalysis and an antimicrobial susceptibility test is performed. It is important to disinfect the area around the urethra and perineum before collecting urine samples, and it is important to collect it intermediate urine, not the first-void urine. We invented a patent urine cup (Patent No. 10-1732843) that can automatically and easily separate first-void urine and midstream urine and using this, the patent cup and the general cup were compared and evaluated using this. Nitrite (P <0.001), WBC (P =0.005), Bacterial colony count (P =0.001), colony positivity rate (P =0.004) in first-void urine (N=24), midstream urine (N=24) separated by patent cup to obtain a significantly higher value. This can be seen from the fact that the first-void urine and midstream urine separated using the patent cup were well separated. Also, the number of Bacterial colonies was statistically significantly higher in the midstream urine isolated using a patent cup (N=24) than in the midstream urine collected using a general cup (N=24) (average 7.9 vs. 4.0 on average, P = 0.002). Which means that the midstream urine separated using the patent cup is more sensitive to the UTI test than the midstream urine collected using a general cup.
밸브안착속도가 LPG엔진 밸브계 거동에 미치는 영향에 관한 연구
김승철(SeungChul Kim),김청균(ChungKyun Kim),이경식(KyoungSik Lee),이한열(HanYeol Lee),김상구(SangGoo Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Due to better emission for CO2 and fine dust (PM10) than diesel and gasoline vehicles, LPG engine that is called low pollutant one is recently adopted for passenger car as well as commercial one and its demand gets growing year by year. The main part that should be replaced in the existing gasoline engine because of the lack of durability is intake and exhaust valves and their seats. This is because LPG has lower lubrication capability than gasoline and also supplying combustion chamber with gas state makes the durability of valve system weaker. Furthermore higher thermal load on exhaust valve system and the lack of combustion products are very tough conditions for adhesive wear. In this point, the effect on adhesive wear through the measurement of behavior change of valves according to seating has been evaluated and the solution to decrease it has been searched. So this study searched the behavior change of valve seating velocity through the redesign of cam profile ramp and confirmed the change of valve seating velocity contributed to decreasing engine wear and its noise.
냉각수온도, 인터쿨러온도, EGR률이 디젤엔진 금속면 온도에 미치는 영향에 관한 실험적 연구
김승철(SeungChul Kim),김청균(ChungKyun Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The recent main design factor to improve fuel economy of diesel engine is to increase engine metal temperature to the allowable maximum safe one in low rpm and load that is, vehicle main driving area. This is enabled by ECU calibration through which coolant and intercooler temperatures are increased. This makes the loss of fuel energy decreased and the improvement of fuel economy possible. In this study, metal temperatures for 80 points in cylinder block and head have been measured and inspected with coolant temperature, intercooler one and EGR rate of diesel engine changed. In result, changing coolant temperature change of cylinder head and block in average and maximum. Changing intercooler temperature change of cylinder head maximum temperature and almost no effect on cylinder block temperature. But in spite of EGR rate by 20%, there was almost no engine metal temperature. These results clearly show that increasing the control temperature of coolant and intercooler make fuel economy improvement possible.
원자간력 현미경(AFM)과 펨토초 펄스 레이저를 이용한 나노 형상 가공
김승철(Seungchul Kim),김승우(Seung-Woo Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
We describe a novel method of scanning probe nanofabrication using a AFM(atomic force microscopy) tip with assistance of Femtosecond laser pulses to enhance fabrication capability. Illumination of the AFM tip with ultra-short light pulses induces a strong electric field between the tip and the metal surface, which allows removing metal atoms from the surface by means of field evaporation. Quantum simulation reveals that the field evaporation is triggered even in air when the induced electric field reaches the level of a few volts per angstrom, which is low enough to avoid unwanted thermal damages on most metal surfaces. For experimental validation, a Ti:sapphire Femtosecond pulse laser with 10 fs pulse duration at 800 ㎚ center wavelength was used with a tip coated with gold to fabricate nanostructures on a thin film gold surface. Experimental results demonstrate that fine structures with critical dimensions less than ~ 1 0 ㎚ can be successfully made with precise control of the repetition rate of Femtosecond laser pulses.