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이귀현,차도완 한국국방경영분석학회 2022 한국국방경영분석학회지 Vol.48 No.2
The use of modeling and simulation tools is interestingly increased to evaluate alternatives for military decision making. It is important to measure the combat effectiveness in battlefield for acquiring weapon systems or developing strategic and operational tactics. It is almost impossible to find useful data from actual combat and deriving a useful mathematical model for combat is generally considered too complex. Therefore, many studies estimate combat effectiveness by using data from wargaming simultations. In this paper, we review recent studies to quantify and measure combat effectiveness and present the future re- search directions. Firstly, we resaerch what measures of effectiveness previous studies used and present studies that considered various measures to decide an alternative. Second, we address how many repli- cations are needed and how to use statistical analysis methods to ensure statistical reliability.
고품질의 토마토 생산을 위한 광처리 기술개발 -일몰 후 광처리가 토마토묘 소질에 미치는 영향-
이귀현 (사) 한국생물환경조절학회 2001 시설원예‧식물공장 Vol.10 No.1
To investigate the effect of red light (R) and far-red light (FR) on controlling the growth of tomatotransplants, height, length of 1st internode, and stem diameter of plant were measured every 12 daysduring 24 days of light treatment. At the end of experiment, fresh and dry weights of roots and shootswere measured. Generally, it was shown that the height of plant was suppressed by the treatment of Rand was enhanced by the treatment of FR. However, the effect of light-treatment time (10 or 20 min)on plant height was not significant. Stem diameter of the plant treated with R was greater than that ofthe plant treated with FR or the control. Dry weight ratio of shoot to rot of the plant treated with Rwas smaller than that of the plant treated with FR. R was more effective than the control, which wasmore effective than FR, in making the transplant compact.
Drying Characteristics of Carrot and Green Pumpkin Slices in Waste Heat Dryer
이귀현 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.1
Purpose: Drying characteristics of the sliced carrot and green pumpkin were investigated by using the waste heat dryer. Methods: The effects of drying temperature (T) and slice thickness affecting drying time were analyzed. Mathematical models for the drying curves were determined with statistical analysis of drying data. Effective diffusivity was determined for the slices of carrot and green pumpkin under various drying conditions. Results: Drying time was reduced at the drying conditions of thinner slice and higher drying temperature. Moisture ratio ( ) according to drying time () was well presented as an exponential function at all of drying conditions for the slices of carrot and green pumpkin with the determination coefficient () of >0.99. The values of effective diffusivity ( ) of the slices for carrot and green pumpkin were increased with increasing the drying temperature. The relationship between Ln( ) and 1/ was linear with the determination coefficient () of >0.97. Conclusions: Drying model was well established as an exponential function at all of drying conditions for drying samples.
이귀현 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.1
Cattle wastes could be used effectively as the solid fuel for heating of agricultural facilities. Thus, this study was carried out to investigate the characteristics of thermal and physicochemical characteristics of solid fuel extruded with cattle wastes. Calorific values for the extruded solid fuel of cattle wastes, which were dried as the moisture contents of 0.0%(w.b) and 35.0%(w.b,) were 3,560 kcal/kg and 2,600 kcal/kg, respectively. Calorific value of extruded solid fuel was linearly decreased with the increase of moisture content. The first, second, and third reaction point during thermal pyrolysis of solid fuels extruded with cattle wastes was investigated as 108.1℃, 312.2℃, and 459.4℃, respectively. The maximum reaction point was presented at the temperature of 312.2℃. Weight loss of extruded cattle wastes during thermal pyrolysis until 600℃ was reached to about 60%. Volume decrease of initial extruded cattle waste was 61% during drying for the use as solid fuel. Maximum strength of extruded cattle wastes, which was dried as the moisture content of 10%(w.b.) was 41,9150 N/㎡. Ignition gas analysis of extruded cattle waste presented that it has small amount of NOx and SOx. It was shown that dried cattle waste had main components of C and O including small amount of Mg, Si, and Ca.
이귀현 한국농업기계학회 2013 바이오시스템공학 Vol.38 No.1
Purpose: The objectives of this study were to construct the solar drying system with evacuated tubular solar collector and to investigate its performance in comparison with indoor and outdoor dryings. Methods: Solar drying system was constructed with using CPC (compound parabolic concentrator) evacuated tubular solar collector. Solar drying system is mainly composed of evacuated tubular solar collector with CPC reflector, storage tank, water-to-air heat exchanger, auxiliary heater, and drying chamber. Performance test of solar drying system was conducted with drying of agricultural products such as sliced radish, potato, carrot, and oyster mushroom. Drying characteristics of agricultural products in solar drying system were compared with those of indoor and outdoor ones. Results: Solar drying system showed considerable effect on reducing the half drying time for all drying samples. However, outdoor drying was more effective than indoor drying on shortening the half drying time for all of drying samples. Solar drying system and outdoor drying for oyster mushroom showed the same half drying time. Conclusions: Oyster mushroom could be dried easily under outdoor drying until MR (Moisture Ratio) was reached to about 0.2. However, solar drying system showed great effect on drying for most samples compared with indoor and outdoor dryings, when MR was less than 0.5.
이귀현,구재오 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-
본 연구에서는 크기가 서로 다른 자갈로 이루어진 3종류의 축열시스템에 대한 축열성능을 조사하였다. 제1종 자갈을 사용한 축열시스템은 출열조로 공급되는 공기의 온도가 50℃와 62℃ 일 때, 축열조 출구의 공기온도가 33℃에 도달될 때까지 가열되는 축열시간은 각각 170분과 130분이었으며, 출구 공기온도 33℃ 이상을 기준으로 한 열 회수 시간은 각각 100분 및 115분으로 나타났다. 제 2종 자갈을 사용한 축열시스템에 있어서 축열조에 공급되는 공기의 온도가 52℃와 64℃일 때, 축열에 소요된 시간은 각각 175분과 140분이었고, 열 회수에 소요된 시간은 각각 120분 및 140분으로 나타났다. 제 3종 자갈을 사용한 축열시스템은 축열조로 공급되는 공기의 온도가 52℃와 64℃ 일 때, 축열에 소요된 시간은 각각 180분과 150분이었고, 에너지 회수시간은 각각 140분과 160분으로 나타났다. 이와 같이 자갈이 작을수록 축열조 출구의 공기온도가 기준온도 33℃에 도달되는 시간이 길었으며, 이것은 축열조내의 공극이 작고 비중량이 커 자갈층을 가열시키는 축열시간이 길어지기 때문인 것으로 사료된다. 또한 작은 자갈일수록 방열시간도 다소 길어져 회수 가능 열에너지가 큰 것으로 나타났다. In this study, the performance of heat-storage system packed with three kinds of gravel was in investigated. In the heat-storage system with the 1st kind gravel, heating were taken to be 170 and 130 minutes in reaching to air temperature of 33℃ at the exit of the system, when temperatures of an inlet air supplied into the system were 50 and 62℃. Durations for recovering heat stored in gravel were 100 and 115 minutes for each inlet air-temperature of 50 and 62℃, respectively, if air temperature of above 33℃ is usable With the 2nd kind gravel, it was taken to be 175 and 140 minutes for obtaining air temperature. 33℃ at an exit of the system, when heated air of 52 and 64℃ was supplied into the system. In this system, recovery times were each 120 and 140 minutes for supplied air of 52 and 64℃ in with drawing heated air above 33℃ at an exit of the system. In the heat-storage system packed with the 3rd kind gravel, it was taken to be 180 and 150 minutes on heating gravel with supplied air temperature of 52 and 64℃ until the temperature of air at exit of the system was reached to 33℃. In this system, Recovery times of heat were 140 and 160 minutes respectively for supplied air of 52 and 64℃. Generally, it was taken more heating and recovery time in the heat-storage system with smaller size of gravel due to smaller porosity and grater specific weigh of gravel.
실 데이터 분석을 기반으로 한 5.56mm 파편모의탄두 강외 탄도 기본 특성 연구
이귀현,유상준,천윤환,최석림 한국국방경영분석학회 2017 한국국방경영분석학회지 Vol.43 No.2
It is very important to understand the characteristic of external ballistics of 5.56mm fragment simulating projectile(FSP) on the protective capacity assessment. To explain the characteristic of external ballistics of 5.56mm FSP, ballastic coefficients and equations should be calculated theoretically. However, complexity of FSP makes this research more difficult. In this sutdy, we collect data including temperature, humidity, gunpowder, and velocity of FSP and suggest the statistical models to show the relationship between the velocity of FSP and environmental conditions in the lab.