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A Study on the Internal Structure of Heumgyeonggaknu
김상혁,이용삼,이민수,함선영 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.2
Heumgyeonggaknu is a water-hammering type automatic water clock which was made by Jang Yeong-Sil in 1438. The water clock that is located in Heumgyeonggaknu consists of Suho which is equipped with 2-stage overflow. Constant water wheel power is generated by supplying a fixed amount of water of Suho to Sususang, and this power is transferred to each floor at the same time. The 1st floor rotation wheel of Gasan consists of the operation structure which has the shape of umbrella ribs. The 2nd floor rotation wheel is made so that the 12 hour signal, Gyeong-Jeom signal, and Jujeon constitute a systematic configuration. The 3rd floor rotation wheel is made so that the signal and rotation of Ongnyeo and four gods can be accomplished. Based on the above conceptual design, this paper analyzed the internal signal generation and power transmission of Heumgyeonggaknu.
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김상혁,오흥철 한국자료분석학회 2010 Journal of the Korean Data Analysis Society Vol.12 No.1
The purpose of this study is to investigate the relationship between three dimensions of perceived service quality (interaction, physical environment, and outcome quality) and customer repeat patronage for the university training restaurant, as well as to explore how different levels of repeat patronage are influenced by three dimensions of perceived service quality for the university training restaurant. The results of the OLS regression analysis show that two dimensions of service quality, outcome quality and physical quality, are significantly related to repeat patronage, but that there is no significant relationship between interaction quality and repeat patronage. The results of the quantile regression analysis also provide more meaningful and concise ideas. Unlike the results of OLS regression, the results of quantile regression show that physical environment quality and outcome quality do not provide same effect on all level of customer's repeat patronage. Several different useful strategies may be considered to increase customer's repeat visits by utilizing the results from quantile regression, rather than the results from OLS regression.
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냉매가열식 열펌프시스템의 성능 특성에 관한 실험적 연구
김상혁,박윤철 대한설비공학회 2006 설비공학 논문집 Vol.18 No.9
To improve heating performance of the heat pump in winter season, refrigerant heating device was applied to conventional heat pump. The refrigerant heating device operates at the heating capacity does not enough to the heating load requirement of the conditioning space. When the discharge air temperature of the indoor heat exchanger goes down to below 40℃ which is criterion for comfort of the occupants in the conditioning space, the system also starts. The refrigerant heating system has new concept of auxiliary heating device for heat pump in winter. In this study, the system performance was analyzed through experiments and parametric study was conducted to improve the COP and control strategies.
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