• 동력기계공학회지
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• 제18권2호
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• pp.5-11
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• 2014

The purpose of this study is to investigate the specific characteristics of combustion and exhaust emissions on a 4-cylinder common rail diesel engine as EGR rate and the rate of blended bio-diesel was altered. Bio-diesel fuel which is a sort of alternative fuels can be adapted to diesel engine directly without modifying. This study was performed to 2000rpm of engine speed with torque 30Nm while EGR rate and the rate of blended bio-diesel was changed. Decreasing combustion pressure and increasing the rate of heat were occurred when we had changed the EGR rate on the 20% of bio-diesel blended diesel fuel. The maximum pressure of combustion and the IMEP became higher as the EGR rate and the rate of blended bio-diesel were changed. Exhaust gas temperature was increased the higher rate of the blended bio-diesel under the fixed EGR rate. However, it went down as the EGR rate increased. The amounts of CO and Soot were reduced with increasing the rate of the blended bio-diesel without changing EGR rate and raised with increasing of the EGR rate. On the fixed EGR rate, NOx was increased along with growing the rate of the bio-diesel. On the other hand, it was decreased while EGR rate were going up.

• 한국미생물·생명공학회지
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• 제39권3호
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• pp.313-316
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• 2011

김치로부터 새로운 프로바이오틱균주인 Lactobacillus sakei proBio65를 분리하고 명명하였다. 형질전환 생쥐(Foxp3-GFP KI 생쥐)를 이용하여 L. sakei proBio65의 면역조절 메커니즘 규명 및 면역 조절능을 확인하고 in vivo 적용 질환제어 응용 가능성을 평가하였다. 조절 T 세포의 master 전사조절인자로 알려진 $Foxp3^+$를 선정하고, L. sakei가 $Foxp3^+$ 전사조절인자를 증가시키는지 확인하기 위해 확립된 세포기반 screening system을 이용하였다. 항 염증성 사이토카인 전사조질인자의 증가에 이어 $Foxp3^+$ 전자조절인자발현의 상당한 증가를 확인하였다. L. sakei proBio65는 염증성면역 장애의 조절에 치료적으로 유용할 것이다.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2002년도 창립10주년기념 심포지엄 발표자료:생물환경 조절 기술의 동향과 전망
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• pp.78-102
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• 2002

• 한국유전체학회:학술대회논문집
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• 한국유전체학회 2003년도 The 12th Korea Genome Conference
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• pp.59-59
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• 2003

• 생물환경조절학회지
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• 제22권4호
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• pp.303-308
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• 2013

배나무 방제용 무인살포시스템 개발을 위하여 생력화를 위한 작업기기를 설계하였다. 또한, 노즐의 분무유형을 실험적으로 분석하여 적정 살포를 위한 노즐 각도, 노즐과의 거리, 수평방향 살포시 거리를 선정하였다. 본 연구를 수행하기 위하여 배의 과수 형태와 재배 환경을 사전 조사하였다. 살포시스템의 살포진행방향에 적합한 분사 노즐각도를 선정하였다. 배나무와 살포시스템 간의 수직거리에 따라 달라지는 살포 정도를 비교하기 위하여 노즐과의 높이에 따른 분포도를 측정하였다. 배나무와 살포 시스템과의 적정 측면 거리를 선정하기 위하여 측면 살포시 거리에 따라 달라지는 분무량을 측정하였다. 무인살포시스템의 약대는 배의 식재 간격에 적합하도록 좌우가 동일한 형태로 2.5m까지 펼쳐지도록 설계 및 제작 하였다. 또한 일정하지 않은 배나무의 높이에 따라 약대의 높이가 1.7m까지 조절되도록 하였다. 본 시스템에 적합한 노즐 각도는 $15^{\circ}$로 나타났다. 배나무와 살포시스템과의 수직거리는 0.7m에서 0.9m의 간격을 유지하여 약제를 살포해야 된다는 것을 알 수 있었다. 수평방향으로 살포하는 경우 좌우 -0.9m에서 0.9m까지의 분무량이 가장 많았다. 약대와의 거리가 0.9m에서 2.1m일 때 가장 많은 분무량을 나타냈다. 실험을 통하여 배 과수원에서의 무인살포시스템에 맞는 분무 환경을 확인 할 수 있었다. 배 과수와의 거리에 따라 적정 거리를 유지하는 시스템을 개발함으로써 효율적인 약액 살포가 가능하게 하였다. 하지만 본 연구에서 진행된 실험은 제한된 실내 환경에서 진행된 것이기 때문에 제작된 시스템의 실제 과수원 환경에서의 실험이 필요하다.

• Journal of Biosystems Engineering
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• 제43권2호
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• pp.94-102
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• 2018

Purpose: In this study, a maintenance free super-capacitor battery charging system based on the photovoltaic module, to be used in agricultural electric carriers, was developed and its charging characteristics were studied in detail. Methods: At first, the electric carrier system configuration is introduced and the electric control components are presented. The super-capacitor batteries and photovoltaic module used in the experiment are specified. Next, the developed charging system consisting of a constant current / constant voltage Buck converter as the charging device and a super-capacitor cell as a balancing device are initiated. The proposed circuit design, a developed PCB layout of each device and a proportional control to check the current and voltage during the charging process are outlined. An experiment was carried out using a developed prototype to clarify the effectiveness of the proposed system. A power analyzer was used to measure the current and voltage during charging to evaluate the efficiency of the energy storage device. Finally, the conclusions of this research are presented. Results: The experimental results show that the proposed system successfully controls the charging current and balances the battery voltage. The maximum voltage of the super-capacitor battery obtained by using the proposed battery charger is 16.2 V, and the maximum charging current is 20 A. It was found that the charging time was less than an hour through the duty ratio of 95% or more. Conclusions: The developed battery charging system was successfully implemented on the agricultural electric carriers.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2007년도 춘계학술대회
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• pp.48-52
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• 2007

As huge amount of literature including biological data is being generated after post genome era, it becomes difficult for researcher to find useful knowledge from the biological databases. Bio-text mining and related natural language processing technique are the key issues in the intelligent knowledge retrieval from the biological databases. We propose a bio-text mining technique for the biologists who find Knowledge from the huge literature. At first, web robot is used to extract and transform related literature from remote databases. To improve retrieval speed, we generate an inverted file for keywords in the literature. Then, text mining system is used for extracting given knowledge patterns and keywords. Finally, we construct a grid computing environment to guarantee processing speed in the text mining even for huge literature databases. In the real experiment for 10,000 bio-literatures, the system shows 95% precision and 98% recall.

• 한국자동차공학회논문집
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• 제19권6호
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• pp.107-112
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• 2011

FFV(Flexible Fuel Vehicle) is the vehicle that can be used liberally from gasoline to E100(Ethanol 100%) for fuel. Recently, interest in the bio-fuel is increased by the environmental factors like exhaustion of the fossil fuel and ruduction of greenhouse gases. For the reason, adopting of FFV is activated in the world including North and South America. In general, bio-ethanol has highly corrosive substance in compare with gasoline. In the part of fuel system, corrosion can make a safety problem in case of fuel leakage and engine starting problem. So the fuel system of FFV have to be made of high corrosion-resistant materials. This study examined the effect of bio-ethanol on the durability properties according to component materials in FFV fuel pump motor and regulator using the High Temperature Fuel Circulation Test.

• 한국자동차공학회논문집
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• 제11권2호
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• pp.56-62
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• 2003

Spray characteristics of conventional diesel fuel and bio-diesel fuel(methyl-ester of soybean oil) were compared, in terms of spray tip penetration and spray angle, by using a commercial high pressure common rail injection system for light-duty DI Diesel engines. The experiments were carried out under the non-evaporating condition at ambient density(8.8, $15.6 kg/\textrm{m}^3$) and injection pressure(75, 135 MPa). The experimental method was based on a laser sheet scattering technique. Spray tip penetrations of bio-diesel fuel were longer, on the whole, than those of conventional diesel fuel, except for lower injection pressure(75 MPa) under lower ambient density$(8.8 kg/\textrm{m}^3)$. But spray near angle and spray far angle of bio-diesel fuel were smaller than those of conventional diesel fuel, implying spray angle is related to the growth rate of spray tip penetration. The experimental results of spray tip penetration agreed well with the calculated values by the Wakuri et al.'s correlation based on the momentum theory.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 추계학술대회
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• pp.65-67
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• 2017

모바일 컴퓨팅과 웨어러블 기술의 발전으로 인하여 일상생활 속에서 생체신호를 측정하는 다양한 웨어러블 디바이스가 개발 및 보급이 되면서, 생체신호를 활용한 건강관리서비스가 주목 받고 있다. 최근에는 다양한 생체신호 분석 툴을 활용하여 건강관리서비스가 개발 및 연구되고 있다. 대부분의 생체신호 분석 연구는 Matlab을 활용한다. 그러나, Matlab으로 개발한 알고리즘을 시스템에 적용하기 위해서는 소스의 변환 작업이 필요하다. 소스의 변환 작업을 생략할 수 있는 스마트 인터페이스를 제공하고자 한다. 본 논문은 Matlab에서 개발한 알고리즘을 시스템에 적용하기 위한 변환 기술을 생략하고, 소스 파일 자체를 시스템에서 실행시키기 위한 인터페이스를 개발한다.