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공기열원 히트펌프와 경유온풍기의 하이브리드 최적 운용기술 연구
문종필,강금춘,권진경,백이,이태석,이수장 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
In this study, hybrid operation technology of combining air source heat pump and diesel heater was developed in optimal algorithm which was determining time for turing on the diesel heater according to the indoor temperature of greenhouse. Hybrid optimal operation algorithm was summarised as follow as; firstly, the heat pump should be turned on just below set temperature in advance and then the diesel heater should be turned on 2∼3℃ lower than set temperature. Secondly, the diesel heater could be turned off after raising the optimal temperature based on heating burden rates calculations before reaching set temperature and then the heat pump sould be turned off on set temperature. The main goal of the above algorithm was that making the heat pump running time longer so that the hybrid heating system could get better efficiency in saving heating cost. As a result of heating experiment for field application, heating cost saving rate was 53% in conditions of heating burden rates of 64% heat pump and 36% diesel heater compared with diesel heater’s running cost and the greenhouse temperature was controlled in the range of 0 ∼ 1℃ lower than set temperature point.
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갑천유역의 영양염류 유달부하량 산정을 위한 SWAT2000 모형의 적용성 평가
문종필,김태철,Moon, Jong-Pil,Kim, Tai-Cheol 한국농공학회 2006 한국농공학회논문집 Vol.48 No.6
In order to estimate delivered nutrients load from non-point sources in the Gap stream watershed in Daejeon, a distributed watershed model SWAT2000 was used so that it could predict the impact of land management practices on water, sediments and chemicals yields in large complex watersheds with varing soils, land uses and management condition over long period of time. The SWAT2000 was applied to the Daejeon (Indong), Yudeung (Boksu) and Gap (Hoeduck) streams for TMDL (Total Maximum Daily Load) of nutrients. The observed water quality and streamflow data of the year of 2002 and 2003 were used for calibration, and those of the year 2004 and 2005 were used for validation. Simulated results were evaluated by Estimation Efficiency Analysis (COE), Regression Analysis $(R^2)$ and Relative Error (R.E.) for the nutrients amounts on the monthly and yearly basis by comparing observed load with estimated load obtained by using SWAT2000 simulations. The COE value fur T-N was ranged from 0.59 to 0.78, $R^2$ values for T-N ranged from 0.65 to 0.84, and R.E values fur T-N load ranged from 4% to 20%. COE value far T-N was ranged from 0.59 to 0.73, $R^2$ values for T-P ranged from 0.67 to 0.82, and R.E values for T-P load ranged from 3% to 25%. Estimated results of SWAT2000 simulation for 3 sites (Indong, Boksu, Hoedeok) were reasonably satisfactory. This study indicated that SWAT2000 model could be applicable to estimate the nutrients load from the Gap stream watershed in Korea.
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문종필 대한전기학회 2013 전기학회논문지 P Vol.62 No.4
In this paper, voltage quality improvement is analyzed in case of Superconducting Fault Current Limiter (SFCL) installed in grounding line of main transformer in power distribution system. First, a resistive-type SFCL model is used. Next, Korean power distribution system is modeled. Finally, when SFCL is installed in the starting point of feeder and grounding line of main transformer, voltage qualities are evaluated according to various fault locations and resistance values of SFCL using PSCAD/EMTDC. The voltage quality results in case of grounding line are compared with the voltage in case of feeder.
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문종필 대한전기학회 2014 전기학회논문지 P Vol.63 No.4
In this paper, the effects of superconducting fault current limiter (SFCL) installed in power distributionsystem on reliability are evaluated and analyzed. The fault current will be decreased in power distribution system withSFCL because of the increased impedance of SFCL. The decreased fault current will improve the voltage drop of the busof substation. The voltage drop is an important factor of power distribution system reliability. In this paper, improvementof reliability worth is analyzed when SFCLs are installed at the starting point in power distribution system. First,resistor-type SFCL model is used in PSCAD/EMTDC. Next, typical power distribution system is modeled. Finally, whenthe SFCLs with impedance 0.5 [Ω] are installed in feeder, power distribution system reliability is evaluated. Also, theimprovement effect of reliability worth including the effect of voltage sag is analyzed using customer interruption costaccording to whether or not SFCL is installed.
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문종필 한국어문교육연구회 2013 어문연구(語文硏究) Vol.41 No.1
This thesis focuses on bringing up the critical mind on Song-Wook’s assessment that the Korean history of literary is too much weighted toward the Western literature even if he attaches importance to his Ko- rean reasoning structure, not to the Western one. Through his essay, it is definitely sure that he had fiercely struggled to learn his by staring at the Korean literature on his own reasoning rather than the Western one. After he positioned on the center the Korean literature which is quite different from the Western literature, he surely gained the confidence on his own body that stress emphasis on the life and the traditional en- vironments or elements that exercise an influence on himself. He insists that the traditional elements never expire if any environments or elements are considered identical with his own body. Song-Wook considers his own mother-tongue as the combination of the idea inherent in the Chinese characters with Hangul, Korean alphabet, based on not the conception of “cogito” by René Descartes but the sensible language that emphasizes on respecting the life. His way of reasoning is the linguistic reasoning that puts a great value on the life based on the deep reasoning on his own body. His way of reasoning is surely quite different from the way of geometric, scientific and mathematical one. 이 글에서는 宋稶이 서구의 것이 아닌 내 것에 많은 비중을 두고 있음에도 불구하고 서구 문학과 이론에 지나치게 함몰되어 있다는 文學史의 평가에 대한 문제제기로부터 시작되었다. 산문을 통해 살펴 본 宋稶의 입장은 서구의 것에 지나치게 傾斜되기 보다는 내 것을 보다 정확히 알기위한 치열한 응시였다. 그가 서구의 것과 상이한 내 것을 중심에 위치에 놓은 후, 얻은 결과물은 生命을 중시하는 자신의 몸에 대한 확신과 자신에게 영향을 주는 전통의 요소였다. 나에게 영향을 주는 요소가 내 몸과 동일하게 간주될 때, 그것은 끊어지지 않고 연결되면서 이어지는 내 것인 母語의 운용과 연결되었다. 宋稶에게 있어 母語는 漢字에 담긴 思想과 우리말을 합친 言語의 운용이었고, 그것은 데카르트의 코키토 개념이 아닌 生命이 존중되는 感覺的인 言語였다. 또한 幾何學的이거나 科學的인 또는 數學的인 것과는 거리가 있는 내 몸에 대한 사유를 기반으로 한 生命의 가치를 지닌 言語的 사유였다.
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