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2차원(次元) 온돌 상난방(床煖房)시스템의 연도내 열유동(熱流動) 및 열전달(熱傳達) 수치해석(數値解析)
김영득,민만기,이상혁,김원갑,Kim, Y.D.,Min, M.K.,Lee, S.H.,Kim, W.K. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.4
Numerical analysis was applied to a simplified two-dimensional Ondol heating model which consists of heating space on the top of it along with radiant and convective heating floor panel, flue channel in the midway and rectangular underground soil region at the bottom. These three components constitute a system thermally coupled at the top and bottom interfaces of the flue channel. Investigated in the present paper are effects with variations of the Reynolds numbers of 100, 200, and 300, Grashof numbers of $0.1{\times}10^6$ and $0.3{\times}10^6$ and aspect ratios of 15 and 20 on the heat transfer and fluid flow characteristics of two-dimensional Ondol heating model by computer simulation.
저온(低溫)가스 연돌의 보온이 연돌의 최적높이에 미치는 영향
김영득,민만기,Kim, Y.D.,Min, M.K. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.3
This paper presents that in the Korean Ondol Heating System using hard coal as an usual fuel, what effects an insulation of chimney with the low temperature gas flow has on the optimum chimney height which gives a maximum gas weight flow rate under the general weather data and actual design condition of chimney is compared with the bared chimney and studied. And also, the effects of chimney materials and diameter, dimensionless temperature difference, insulating materials and thickness which have on the optimum chimney height were researched and a good results increasing a maximum gas weight flowrate is obtained by insulating the chimney.
KHU-SentiwordNet: 형식형태소를 결합한 한국어 감성사전 개발
권오병(Kwon, Ohbyung),김정남(Kim, Jungnam),조현용(Cho, Hyun Yong),홍경아(Hong, Kyung Ah),한재민(Han, Jae Min),정장훈,김영운(Kim, Yeoung Woon),최석재(Choi Sukjae) 한국IT서비스학회 2019 한국IT서비스학회 학술대회 논문집 Vol.2019 No.2
빅데이터 분석에 있어 감성사전은 감성분석의 정확도를 제고하는 데 매우 중요한 요소이다. 그러나 감성사전을 구축할 때 긍, 부정 판단에는 주관적인 측면이 들어갈 수밖에 없다. 그럼에도 그동안 감성사전은 일반인의 판단에 근거한 경우가 많아. 한국어 전문가의 판단이 필요했다. 이에 빅데이터 분석 영역 전문가와 한국어 분야 전문가의 체계적 판정을 통해서 비교적 객관적인 긍정 부정값을 도출해 내야 한다. 더욱이 기존에는 실질형태소에 치중되어 있어, 분석의 정확도에 한계가 있었다. 이에 본 연구의 목적은 실질형태소뿐 아니라, 형식형태소와 정도부사까지 망라한 최대의 한국어 감성사전을 경영 및 한국어 전문가 들에 의하여 구축한 방법을 제안하고 그 성과를 제시하는 것이다.
김영철,박근우,윤영,민만기,최영돈,Kim, Y. C.,Park, G. W.,Youn, Y.,Min, M. K.,Choi, Y, D, 대한설비공학회 2001 설비공학 논문집 Vol.13 No.3
A system simulation program was developed for a multi-type inverter heat pump. Electronic expansion valve(EEV) was used to extend the capacity modulating range of the heat pump as expansion device. The program was also developed to calculate actual system performance with the building load variation with climate during a year. The performance variation of a multi-type hat pump with two EEV and an inverter compressor was simulated with compressor speed, capacity, and flow area of the EEV. As a result, the optimum operating frequency of the compressor and openings of the expansion device were decided at a given load. As compressor speed increased, he capacity of heat pump increased, the capacity of heat pump increased. Therefore flow area of EEV should be adjusted to have wide openness. Thus the coefficient of performance(COP) of the heat pump decreased due to increasement of compressor power input. The maximum COP point at a given load was decided according to the compressor speed. And under the given specific compressor speed and the load, the optimum openings point of EEV was also decided. Although the total load of indoor units was constant, the operating frequency increased as the fraction of load in a room increased. Finally ad the compressor power input increased, the coefficient of performance decreased.