• Journal of the Korean Society of Combustion
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• v.4 no.2
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• pp.43-50
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• 1999

Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. The fuel feeding system has been improved with stringent requirement for exhaust emissions. LPG carburetion system was first introduced, then the system has been changed to a precisely controlled gas injection system, but this gas feeding system has a limitation on improving power output. In order to improve an engine performance, a multi-point port injection system was introduced recently, and a liquid direct injection system into a cylinder was suggested as a next generation system to maximize a fuel economy as well as a power. This study addresses the analysis of the LPG spray from diesel injectors. The spray images are visualized and compared with diesel sprays in a wide injection pressure range. The photographs show much wider dispersion of LPG sprays.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.25 no.5
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• pp.337-344
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• 2015

As many of armored vehicles are seriously exposed to threat of IEDs(Improvised Explosive Devices) in the Afghanistan war and the Iraq war. V-shaped military vehicles are deeply studied in order to protect crews and mounted soldiers against land mines. Generally the experiment on full-scaled V-shaped structure needs excessively high cost, which becomes a huge barrier to study. In this paper, we explore the possibility to make a half-scaled model of the V-shaped structure by using the geometric similarity scaling. We demonstrate the geometric similarity scaling between the original model and the half-scaled model is established on the momentum and deflections of structure via computer simulations and experiments. At this stage, we conduct only numerical analysis of predicting vibration of V-shaped structure because measuring vibration of structure is difficult in the mass-explosion experiment, which is remained as future work.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.331-332
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• 2008

최근 엘리노 현상과 기상이변(태풍 및 폭설)으로 갤로핑 및 전선도약(Sleet jump) 등에 따른 송전선로 상간단락 고장의 우려가 날로 증가하고 있다. 특히 345kV급 간선계통의 상간단락 고장은 순간전압 강화 등 전기품질 저하로 이어질 수 있다. 이에 본 논문에서는 345kV 2도체용 폴리머 상간스페이서를 개발하여 상간단락고장에 대한 근본적인 예방책을 제시하였다. 폴리머용 345kV 절연 설계, 고강도 FRP ROD 설계 및 턴버클을 이용한 미세조정 장치 적용, 코로나 방지를 위한 코로나 링 채용 등을 통하여 최적의 345kV 2도체용 상간스페이서를 고안하였다. 또한 상간스페이서 소재의 성능 평가 및 해석을 위하여 Maxwell 2D Field Simulator를 이용하여 모델링하였으며 갓 형상에 따른 전계분포 해석과 FRP와 고무 계면에서의 전계분포 해석도 수행하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.11a
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• pp.49-55
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• 2002

기존의 영상 획득 시스템들이 어느 정도의 엘리어싱을 허용하도록 제작되어왔음에도 불구하고, 고해상도 영상에 대한 요구는 점점 더 증가하고 있다. 본 논문에서는 부정확한 부화소 단위의 위치추정 오류를 고려한 고해상도 재구성 알고리즘을 제안한다. 부정확한 부화소 위치 추정 오류로 인해 생기는 불량위치문제(ill-posedness)를 해결하기 위해 정규화된 반복 연산법을 적용하였다. 특히 여러장의 저해상도 영상들을 개별적으로 고려하기에 적합한 다중채널 영상 재구성 방법을 도입하였다. 각 저해상도 영상에서 발생하는 움직임 추정오류는 서로 다른 경향성을 나타내므로, 정규화 파라미터들은 각 채널에 맞게 결정되어야 한다. 이를 위채 정규화 파라미터들을 자동으로 결정하는 방법을 제안한다. 제안한 알고리즘은 움직임 추정 오류에 매우 안정하며, 원 영상과 잡음에 대한 사전정보를 필요로 하지 않는다. 또한 주관적인 측면과 객관적인 측면에서 모두 우수한 결과를 실험적으로 보인다.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.43 no.4
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• pp.627-637
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• 1994

In this study, a predictive fuzzy control algorithm to supervise the elevator system with plural cars is developed and its performance is evaluated. The proposed algorithm is based on fuzzy in-ference system to cope with multiple control objects and uncertainty of system state. The control objects are represented as linguistic predictive fuzzy rules and simplified reasoning method is utilized as a fuzzy inference method. Real-time simulation is performed with respect o all possible modes of control, and the resultant controls ard predicted. The predicted rusults are then utilized as the control in-puts of the fuzzy rules. The feasibility of the proposed control algorithm is evaluated by graphic simulator on computer. Finallu, the results of graphic simulation is compared with those of a conventional group control algorighm.

• KOREAN POULTRY JOURNAL
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• v.38 no.7 s.441
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• pp.188-194
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• 2006

풍전부화장-임직원 승진인사 단행/ (주)한펠-고객감사초청세미나 개최 및 승진인사/ (주)마광-영업 및 기타부서 사원 영입/ 우진비엔지(주)-보건복지부장관 표창 수상/ 서울사료(주)-하절기 제품 강화를 통한 대농가 서비스/ 바이엘코리아-곰팡이독소 세미나 개최/ (주)삼양애니팜-품질향상을 위한 주사제 생산시설 교체/ 서부사료-창립37주년 기념행사 개최 및 직원채용/ (주)애그리브랜드 퓨리나코리아-40주년 창립기념식 및 사업전진대회 개최/ (주)경축-창립 36주년 기념 자연보호 행사 개최/ 네오바이오(주)-링거 솔루션 '하이드로솔' 출시/ (주)파루-파리유인제 '파리팡' 출시/ 해훈케미칼(주)-친환경 '파리' 스프레이 유인포충제 '터치킬라-에스' 양계업계 관심집중/ 동부한농-신제푼 넉다운-P, 수퍼킬 출시, 연막·분무 모두 가능한 친환경 살충제 "넉다운-P", 효과 빠른 파리전용 유인 살충제 "수퍼킬"

• Korean Journal of Logic
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• v.14 no.1
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• pp.1-23
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• 2011

I take the position of the thirders on the sleeping beauty problem like Elga and criticize Lewisian halfers. In particular, I attack Franceschi's recent arguments for the halfers. In addition, I claim that Bostrom's and Kim's hybrid view is not satisfactory, because it is to pre-empt or to take the burden of proof that the problem is the genuine paradox. Consequently, the purpose of this paper is to show that the thirders' argument is more intuitive than others and what the fallacies of the halfer's arguments are.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.880-883
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• 2012

일반적인 환경모니터링시스템은 다양한 환경 상태 데이터를 수집하여 사용자들에게 다양한 정보를 제공한다. 측정된 정보를 원격 CDMA의 단말기를 이용하여 사용자가 쉽게 관찰할 수 있도록 구성되어 있으나 이동성의 제한 및 SMS 요금이 발생하는 단점을 지닌다. 본 연구에서는 스마트폰을 기반으로 모바일 애플리케이션의 장점을 활용할 수 있는 안드로이드 기반의 환경정보 모니터링 시스템을 제안한다. 제안된 시스템에서는 푸시기반 알림 기능을 제공함으로써 사용자는 이동성을 확보함과 동시에 기존의 SMS 방식에서 발생한 비용의 문제를 해결할 수 있는 장점이 있다.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.30 no.1
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• pp.24-32
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• 2021

Dental implant have been in use for a long time to restore at missing tooth. But, To place dental implant at good position very is difficult. Improperly positioned dental implants make some problems to have a good function of dental implant. so, To place dental implant at accurate position is the most important step throughout the whole process. Digital guided system of dental implant is very useful to have a accurate position of dental implant and it makes upper restoration more esthetic and funcional.

• Journal of Internet Computing and Services
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• v.17 no.1
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• pp.35-45
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• 2016

Melatonin hormone involved in human's circadian rhythm adjustment sensitively responds to light's specific short wavelength ratio. A shift worker's circadian rhythm disturbance and sleep disorder are caused by the existing lighting conditions, whose short wavelength ratio is fixed. The life pattern of a shift worker changes irregularly because of irregular working hours and the same lighting environment; thus, his/her concentration is reduced. For such a reason, negative effects ensue to the detriment of healthy everyday life, including a high risk of accidents or having unsound sleep after leaving work. A smartphone-based wavelength control LED lighting system that targets shift workers and that can easily measure and control lighting suitable for wake-sleep cycle, according to working hours and closing hours, is proposed in this paper. First, after the light characteristics of LED lighting that changes depending on light control ratio are measured through the color sensor installed on the smartphone and the externally-linked Mini-Spectrometer, they are stored in the database. Based on the stored optical characteristics data, the measurement module and light control module are implemented. Lighting is offered using a control ratio having the maximum rate of short wavelength in consideration of the target illuminance, classified according to work type by identifying working hours as time when waking is required for shift workers. After a shift work leaves work, the amount of lighting is varied, using a control ratio having a minimum short wavelength rate so that a shift worker can enter the sleep state naturally.