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김면희(Myun-Hee Kim),최영근(Young-Geun Choi),신현승(Hyeon-Seung Shin),이문환(Moon-Hwan Lee),이태영(Tae-Young Lee),이상협(Sang-Hyoup Lee) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.2
In GMAW(Gas Metal Are Welding) processes, bead geometry (penetration, bead width and height) is a criterion to estimate welding quality, Bead geometry is affected by welding current, arc voltage and travel speed, shielding gas, CTWD (contact-tip to workpiece distance) and so on. In this paper, welding process variables were selected as welding current, arc voltage and travel speed. And bead geometry was reasoned from the chosen welding process variables using neuro-fuzzy algorithm. Neural networks was applied to design FLC(fuzzy logic control), The parameters of input membership functions and those of consequence functions in FLC were tuned through the method of learning by backpropagation algorithm, Bead geometry could he reasoned from welding current, arc voltage, travel speed on FLC using the results learned by neural networks. On the developed inference system of bead geometry using neuo-fuzzy algorithm, the inference error percent of bead width was within ±4%, that of bead height was within ±3%, and that of penetration was within ±8%, Neural net works came into effect to find the parameters of input membership functions and those of consequence in FLC. Therefore the inference system of welding quality expects to be developed through proposed algorithm.<br/>
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칼리나 사이클의 발전효율에 영향을 미치는 요소에 관한 이론적 해석
이기우(Yi, Kee-Woo),전원표(Chun, Won-Pyo),신현승(Shin, Hyeon-Seung),박병덕(Park, Byung-Duck) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.9
본 연구에서는 발전용량이 20kW인 폐열회수용 칼리나 발전시스템의 설계 자료를 확보하기 위하여 EES프로그램을 사용하여 해석하였으며, 암모니아농도, 증기압력, 열원온도 및 냉각수온도가 발전효율에 미치는 영향을 분석하였다. 연구결과 에서, 암모니아 농도는 낮을수록, 증기압력은 높을수록 발전효율은 증가하였다. 하지만 암모니아 농도가 너무 낮으면 발전효 율이 감소하는 영역이 있었다. 터빈입구의 증기압력이 높아지면 발전효율도 높아지며, 암모니아 농도가 높을수록 증기압력의 영향을 더 많이 받는 것으로 나타났다. 최대의 발전효율을 얻기 위한 암모니아 농도, 증기압력, 열원온도 및 냉각수온도 조건 이 존재한다는 것을 알 수 있었다. 20kW의 발전시스템에서는 증기압력은 25bar, 열원온도는 160oC, 냉각수온도가 10oC일 때 암모니아 농도가 0.4에서 발전효율은 최고로 15%까지 가능하였다. This study examined the effects of the key parameters on the power efficiency of the waste heat power plant using the EES program to obtain data for the design of the 20kW Kalina power plant. The parameters include the ammonia mass fraction, vapor pressure, heat source temperature, and the cooling water temperature. According to the analyses, a lower ammonia mass fraction and a higher vapor pressure increase the efficiency, in general. On the other hand, this study shows that there is a specific region with a very low ammonia mass fraction, where the efficiency decreases with ammonia mass fraction. Regarding the vapor pressure at the turbine inlet, the power efficiency increases with increasing vapor pressure. In addition, it was found that the influence of the vapor pressure on the efficiency increases with increasing ammonia mass fraction. Finally, the optimal condition for the maximum power efficiency is defined in this study, i.e., the maximum efficiency was 15% with a 25bar vapor pressure, 160℃ heat source temperature, 10℃ cooling water temperature, and 0.4 ammonia mass fraction.
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오성민 ( Sung-min Oh ),한민수 ( Min-su Han ),권영민 ( Yeong-min Kwon ),박원서 ( Won-seo Park ),김준현 ( Jun-hyeon Kim ),신현승 ( Hyeon-seung Shin ),하상윤 ( Sang-yun Ha ),정해도 ( Hae-do Jung ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1
Objectives : Aedes albopictus(Skuse) is known as the major vector of human arboviruses that can transmit approximately 22 virus belonging to Togaviridae, Flaviviridae, Bunyaviridae families. Recently, Aedes albopictus has been suggested to be involved in the transmission of Zika virus in several countries, including Southeast Asia. Methods : In this study, Among the military units stationed in Incheon, two coastal units were selected and two inland units were selected, we used BG sentinel trap to collection mosquitoes from June to September. Results : We have collected mosquitoes at intervals of 2 weeks and the total population of mosquito is 7,917. From among these 1,617 mosquitoes were Ae. albopictus, this accounted for 20.4% of the total mosquitoes which has greatly exceeded the national average of 23.8%. In addition, We have collected 5,460 Cx. pipiens(69.0%), 225 Anopheles spp.(2.8%), 497 Och. koreicus(6.3%), 92 Ar. subalbatus(1.2%), 20 Ae. vexans(0.3%), 2 Cx. bitaeniorhynchus, 2 Cx. orientalis, 2 Cx. tritaeniorhynchus. After we collected mosquitoes, we move immediately to the laboratory, classified mosquitoes and tested the pathogen in the way(1 pool contains maximum 50 mosquitoes) of a standard inspection method(Real-time PCR) by Korea centers for disease control and prevention. Although a total of 50 pools from the collected Ae. albopictus was performed. Flavivirus including Zika virus was not detected during study period. Moreover, malaria inspection of Anopheles spp. 30 pools were tested and that were all negative. Conclusions : According to the study, white-rooted mosquitoes living in military areas have not yet been contaminated with pathogens such as Zikavirus, Dengue fever and yellow fever, but the high habitat density indicates that there is a risk of rapid spread if these kind of diseases are infulx from abroad. Therefore, by establishing a system to monitor mosquitoes in the military, we can use it to prepare for the outbreak of foreign infectious diseases and to improve the health of soldiers and prevent the national infectious disease.
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고속철도 터널출구로부터 방출되는 충격성 소음에 관한 모형실험
김희동,이종수,신현승 安東大學 1995 安東大學 論文集 Vol.17 No.1
As a railway train enters a tunnel at high speed, a compression wave is formed in front of the train and propagates along the tunnel. The compression wave subsequently emerges from the exit of the tunnel and generates a pulse wave, which causes an impulsive noise. In order to clarify the acoustic characteristics of the noises, in the present study experiment was carried out by using the pulse waves emitted from an open end of a shock tube. Various pulse waves were obtained by controlling the compression wave formed in the tube. The results show that as the compression wave formed at tunnel exit becomes strong, the pulse wave emitted propagates with strong directional characteristics forward the axial direction of the tube, and that attenuation of the pulse wave propagating a ground surface can be reasonably predicted by a linear acoustic theory. Furthermore, the impulsive noise at far-field from the tube exit results in a sound level reduction of 6dB with a doubling of the propagating distance.
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