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고성혁(Seong-Hyuk Ko),윤봉규(Bong-Kyoo Yoon) 한국경영과학회 2020 經營 科學 Vol.37 No.1
It is challenging to respond to multiple fire requests during military operations. Many studies have attempted to tackle this problem as an optimization problem for fire time scheduling that minimizes the firing time. Meanwhile, infantry mortars in the battle have many unexpected targets than scheduled targets due to short fire range. Besides, there are various limitations for mortar positions that provide enough firing space as a large portion of the Korean peninsula is mountainous. In this study, the operation of mortar company was analyzed through a priority queuing model to provide an efficient structure of the company that minimizes fire response time considering geological characteristics of operations encountered by the Korea Army. A simulation model was also given to apply our model to the real situation as well as verify the analytic model.
[가솔린엔진부문] 자동차용 광촉매 시스템을 위한 조촉매 영향 평가
고성혁(Seong Hyuk Ko),손건석(Geon Seog Son),윤승원(Seung Won Yun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As a promising catalyst reducing cold start emissions of automobiles, a photocatalyst system has been studied. Since the photocatalyst is only activated by UV wavelength light, it needs no heat energy like a conventional TWC, therefore no light-off time. However, as a cold temperature catalyst to treat cold start emissions of a vehicle, previous studies on characteristics of photocatalyst have room for improvement in terms of performance and durability subject to aging conditions and exhaust gas conditions.<br/> In this study, additive catalysts for photocatalyst have been investigated from the viewpoints of performance and durability improvement. Eleven different coating samples were prepared with the combination of six kinds of additives and two kinds of photocatalyst materials. Then these samples were aged with a hydrothermal aging process. The performance of these samples was measured on a model gas apparatus with simulated exhaust gases. The durability was also analyzed with XRD<br/>
[가솔린엔진부문] 광촉매 성능 및 내구에 미치는 조촉매 영향 평가
손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),윤승원(Seung Won Yun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As a promising catalyst reducing cold start emissions of automobiles, a photocatalyst system has been studied. The photocatalyst is activated by UV wavelengths light, it need no heat energy like as a conventional TWC. Therefore it needs no light off time. However, as a cold temperature catalysts, photocatalysts has some problems to apply on vehicle system.<br/> In this study, additive catalysts for photocatalysts was investigated in the points of increasement of the performance and the durability. Two kinds of additive were coated with two kinds of photocatalysts. The samples were aged with a hydrothermal aging method. The performance of these samples were tested on a model gas apparatus. The durability was also tested with XRD.<br/>
손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),김대중(Dae Joon Kim),이귀영(Kwi Young Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
To overcome the shortage of conventional TWC that is activated at high temperature, more than 250'C ‘ photocatalyst is considered as a new technology. Photocatalyst can be activated only by lights that have a certain wave range regardless of its temperature. In this study hydrocarbon reduction with photocatayst was investigated with model gas tests.<br/> To understand the effects of co-existance gases on the hydrocarbon reduction by photo-reaction ‘ CO and NO, O₂, H₂O gases that are components of exhaust gas of gasoline engine were supplied with C3H8fN_ to a photo-reactor. The photo-reactor contains TiO₂photocatalyst powders and a UV bulb. The results show that oxygen is the most important factor on reducing HC with photocatalyst. Photocatalyst seems to have a good possibility of application for automotive catalyst to reduce cold start emissions
손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),김대중(Dae Joong Kim),이귀영(Kwi Young Lee) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.5
To overcome the shortage of conventional TWC that is activated at high temperature, higher than 250˚C , photocatalyst is considered as a new technology. Because the photocatalytic reaction of photocatalyst is not a thermo mechanical reaction, it is not necessary to heat the system to start the reaction. It can be activated just by ultra violet light that includes wavelengths shorter than 400 nanometers even at ambient temperature. In this study photocatalytic reduction of hydrocarbon was investigated with a model gas test. To understand the effects of co-existence gases on the hydrocarbon reduction by photoreaction, CO and NO, 02, H2O gases those are components of exhaust gases of gasoline engine are supplied with C₃H??/N ₂ to a photoreactor. The photoreactor contains Ti02 photocatalyst powders and a UV bulb. The results show that oxygen is the most important factor to reduce HC emission with photocatalyst. Photocatalyst seems to have a good probability for automotive application to reduce cold start HC emissions.
손건석(Geon Seog Son),윤승원(Seung Won Yun),고성혁(Seong Hyuk Ko),김대중(Dae Jung Kim),송재원(Jea Won Song),이귀영(Kwi Young Lee) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.2
Because UV wavelength lights can activate photocatalysts, plasma is used as a light source of a photocatalytic reactor. Even though plasma has good intensity for photo reaction, substrate of catalyst coating was limited by the geometry of plasma generator. Usually bead type substrate was used for a pack bed type reactor. Honeycomb monolith type substrate was used with UV lamps instead plasma, due to the light penetration the honeycomb monolith length was too short to show good activity. In this study a photocatalytic reactor, which is using a honeycomb monolith substrate, was investigated with plasma as an activation light source. As a parametric study the effects of following factors on plasma generation and power consumption are examined; supply voltage, substrate length, environment condition, catalyst loading and ratio. Using the test results, the practicability test was done with simulated synthetic gases representing bad smells and automotive exhaust gases.
[가솔린엔진부문] 광촉매 반응기의 실차 적용을 위한 기초 연구
윤승원(Seung Won Yun),손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),김대중(Dae Joong Kim),송재원(Jae Won Song),이귀영(Kwi Young Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Current vehicle exhaust aftertreatment systems using mostly three way catalysts require a long light-off time, resulting in such a low conversion efficiency during cold start that these systems are very difficult to comply with the most stringent future emission regulations. As a promising alternative to overcome this shortcoming, a photocatalytic system Il3s been recently developed. In this study, thermal conversion efficiency and electric cll3racteristics of a photocatalytic reactor as a function of light exposure time Il3ve been investigated. For this purpose, chosen are two different types of photocatalyst and additive catalyst which have been developed with photocatalytic reactivity and mechanical and chemical durability taken into consideration. These two catalysts are mixed with highly optimized ratios, coated on a honeycomb monolith substrate, and thermal conversion efficiency has been measured on an engine test bench. Also, plasma generation, electric power consumption. UV light intensity variation with a function of light exposure time
손건석(Geon Seog Son),윤승원(Seung Won Yun),고성혁(Seong Hyuk Ko),이귀영(Kwi Young Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Oxygen sensors taken form the aftereatment systems of 4 vehicles which had been aged in domestic filed were examined for aging effects on emissions using a idle engine bench. Also the artificial sensor signal generated by fuction generator was supplied to ECU, instead of oxygen sensor to simulated aging effects of oxygen sensor. This study shows that reduction of amplitude, deformation and shift of mean value of aged sensors seriousely affect on the engine out emissions and the performance of TWC.
광촉매 반응기를 이용한 실차 배출가스 저감에 관한 실험적 연구
윤승원(Seung Won Yun),손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),송재원(Jae Won Song),이귀영(Kwi Young Lee),배기경(Ki Kyong Bae) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Current vehicle exhaust aftertreatment systems using mostly three way catalysts require a long light-off time, resulting in such a low conversion efficiency during cold start that these systems are very difficult to comply with the most stringent future emission regulations. As a promising alternative technology to overcome this shortcoming, a photocatalytic system has been recently developed. In this study, emission evaluation of two photocatalytic reactors have been investigated. For this purpose, chosen are two different types of photocatalytic reactors which have been developed with photocatalytic reactivity and mechanical and chemical durability taken into consideration. These two catalysts are mixed with highly optimized ratios, coated on a honeycomb monolith substrate. Also, power supply effects on emission conversion efficiency have been investigated.