초음파 검사 기반의 용접결함 분류성능 개선에 관한 연구

김재열,윤성운,김창현,송경석,양동조,--,-- 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

In this study, we made a comparative study of backpropagation neural network and probabilistic neural network and bayesian classifier and perceptron as shape recognition algorithm of welding flaws. For this purpose, variables are applied the same to four algorithms. Here, feature variable is composed of time domain signal itself and frequency domain signal itself. Through this process, we comfirmed advantages/disadvantages of four algorithms and identified application methods of four algorithms.

최적설계 기법을 적용한 1톤 운반차용 P.T.O축 및 트랜스미션 개발에 관한 기초연구

김재열,심재기,최승현,정효희,김훈조,오현중,박경섭 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

Now, power tillers and cultivators which are spread among fruit tree households have usage, low application, and high accident risk. Therefore, the development of multi-purpose work vehicles is needed as an alternative for these problems. Especially, easy usage and the ability to easily change gears when driving and the development of the P.T.O for various tasks such as pruning, water lifting, pest control, application and, mowing are needed. In this research, we will develop a transmission with design on P.T.Oaxle for agricultural work vehicles including multi-purpose vehicles. We aim to develop a 4-wheel drive transmission of synchronous contact type for practical use in fruit tree households which is required to be a large-sized agricultural vehicle. Therefore, we have per performed as follows that are composed of load capacity from 500kg to 1,000kg, safety securing for passengers, and drive securing under bad conditions of the topography slope and swampy land and the rest. For this purpose, we have developed a prototype vehicle through strength analysis of transmission design. we have selected optimal design conditions (Optimal RPM and torque according to some works) on the power transmission with multi-purpose vehicle for various jobs: spraying, manure spreading, mowing, brush wood chopping. If development of the P.T.O containing variable RPM and torque is successful, the following tasks can be possible. Air pruning, air maintenance, water lift, pest control, application, mowing, spraying, and brush wood chopping are possible with this developed P.T.O. Methods and contents for research are followed. Therefore, we have achieved performance-tests through the prototype of the multi-purpose work vehicle and have improved on troubles by the analysis of results of R&D. Also, we provided solutions to problems in mass production in the future.

2004년 3월 $4{\sim}5$일 중부지방 대설 분석

신도식,박윤호,이재원,심기오,Sin, Do-Sik,Park, Yun-Ho,Lee, Jae-Won,Sim, Gi-O 한국방재학회 2004 한국방재학회지 Vol.4 No.4

박달나무의 반형매 가계간 Cd Phytoremediation과 축적 특성

오창영,이재천,한심희,김판기 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.3

The main purpose of this study was to select a B. schmidtii population which has high cadmium tolerance and remediation and to determine the difference of cadmium uptake patterns among populations. One-year-old B. schmidtii seedlings were treated with 0, 0.4, 0.8mM CdSO₄ *3/8H₂O for two months. Cadmium concentrations in different positions of stem and cadmium concentrations and contents of leaves, stems and roots were analyzed. Also soil cadmium concentrations were analyzed. B. schmidtii was highest in root and lowest in shoot tip, showing a gradual decrease from root to shoot tip. The shoot to root Cd concentration ratios were over 1.26. It is concluded that B. schmidtii has good potential for phytoextraction as a shoot accumulator, which can be used for remediation of cadmium-contaminated areas. But tolerance differs between populations. Therefore B. schmidtii should be used as a means of phytoremediation after selection for Cd tolerance is performed.

화상처리에 의한 춉트 스트랜드 섬유배향의 분포측정

김혁,윤성운,한길영,심재기,이동기 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.2

In order to examine the accuracy of intensity method, the fiber orientation distribution of chopped strand reinforced polymeric composites is measured using image processing. Theoretical and experimental results of fiber orientation function are compared with each other for the composites having different fiber content and fiber orientations. An intensity method is used for the experimental investigation and the measured fiber orientation function is compared to the calculated one. The results show that, firstly, the feature of fiber orientation can be represented and identified by the fiber orientation function J measured and theoretical fiber orientation functions, J_(M) and J, respectively and related as J_(M)=0.73J. Secondly, as far as the measuring of fiber orientation is concerned, the intensity method is, in general, found to be quite effective due to its feature of using the intensity difference in the measuring ranges. Finally, the accuracy of the method increases when the fiber with less clash is considered.

수목의 장기 기후변화 연구시설: CO₂ 폭로용 상부 개방형 온실

이재천,김두현,김길남,김판기,한심희,Lee, Jae-Cheon,Kim, Du-Hyun,Kim, Gil-Nam,Kim, Pan-Gi,Han, Sim-Hee 한국농림기상학회 2012 한국농림기상학회지 Vol.14 No.1

본 연구는 외국에서 이용해 왔던 기존의 상부 개방형 온실의 단점을 보완하여, 장기적인 연구가 요구되는 수목을 대상으로 설치한 상부 개방형 온실의 운영결과를 제공하고자 하는 것이다. 이 자료에는 이산화탄소의 농도 조절 능력 및 안정성을 비롯하여, 대기와 OTC 내부 간의 미세환경 차이에 대한 정보를 포함하고 있다. OTC 시설은 대조구인 OTC 외부 시험구, 대기와 동일 $CO_2$ 농도의 OTC 시험구, 대기 $CO_2$ 농도의 1.4배 증가시킨 OTC 시험구, 대기 $CO_2$ 농도의 1.8배 증가시킨 OTC 시험구로 구성되어 있다. 이시설은 온실 6기, $CO_2$ 폭로장치 6기, $CO_2$ 제어장치 6기, 액화탄산가스 탱크 1기, 제어감시실 1실로 구성되어 있다. 온실 6기는 직경 10m, 높이 7m의 10각형 구조물로 제작되었으며, 상부 개구율은 75% 이상을 유지하고 있다. $CO_2$ 폭로를 위해 16개 원통형 토출배관을 도입하였다. OTC의 평균 가동률은 2010년 6월에 94.2%로 가장 낮았으나, 7월 이후부터는 98% 이상의 가동률을 나타냈고, 2011년에는 100% 가동률을 보였다. 2010년과 2011년 모두 $CO_2$ 농도 조절 결과는 목표 값에 도달하였으며, 2011년이 보다 안정된 값을 나타냈다. 2011년 무처리 OTC의 $CO_2$ 농도는 목표 값의 106%였으며, 1.4배 OTC는 목표 값의 100%, 1.8배 OTC는 목표 값의 94%였다. 대기와 OTC 내부의 온도는 오전 10시부터 오후 2시 사이에 차이가 가장 컸는데, 편차는 $1.2{\sim}2.0^{\circ}C$를 기록했으나, OTC간 온도 차이는 크지 않았다. 대기와 OTC 내부간 상대 습도의 차이는 0.1~1% 사이로 매우 적었다. OTC를 운영하는데 사용된 $CO_2$ 가스 소비량은 2010년과 2011년 6월에 가장 많은 11.33톤과 17.04톤을 기록했다. The open-top chamber (OTC) system is designed for long term studies on the climate change impact on the major tree species and their community in Korea. In Korea Forest Research Institute (KFRI), the modified OTC system has been operating since September 2009. The OTC facility consists of six decagon chambers (10 meters in diameter by 7 meters high) with controlled gas concentration. In each chamber, a series of vertical vent pipes are installed to disperse carbon dioxide or normal air into the center of the chamber. The OTC is equipped with remote controlled computer system in order to maintain a stable and elevated concentration of carbon dioxide in the chamber throughout the experimental period. The experiment consisted of 4 treatments: two elevated $CO_2$ levels ($1.4{\times}$ and $1.8{\times}$ ambient $CO_2$) and two controls (inside and outdoors of the OTC). Average operational rate was the lowest (94.2%) in June 2010 but increased to 98% in July 2010 and was 100% during January to December 2011. In 2010~2011, $CO_2$ concentrations inside the OTCs reached the target programmed values, and have been maintained stable in 2011. In 2011, $CO_2$ concentrations of 106%, 100% and 94% of target values has been recorded in control OTC, $1.4{\times}$ $CO_2$-enriched OTC and $1.8{\times}$ $CO_2$-enriched OTC, respectively. With all OTC chambers, the difference between outside and inside temperatures was the highest ($1.2{\sim}2.0^{\circ}C$) at 10 am to 2 pm. Temperature difference between six OTC chambers was not detected. The relative humidity inside and outside the chambers was the same, with minor variations (0~1%). The system required the highest amount of $CO_2$ for operation in June, and consumed 11.33 and 17.04 ton in June 2010 and 2011, respectively.

과민성 장 증후군의 증상 경감을 위한 비약물적 접근 고찰

최명애,김금순,안경주,채영란,최정안,홍해숙,박미정,이경숙,신기수,정재심 대한기초간호자연과학회 2005 Journal of korean biological nursing science Vol.7 No.2

There have been many trials of clinical efficacy of multicomponent and single component treatments for irritable bowel syndrome(IBS). We reviewed effects of non phamacological treatments in the IBS. Though the efficacy of multi-component approaches was unclear, several results suggest that cognitive behavioral therapy was effective in improving gastrointestinal symptoms of IBS. As a single component, cognitive therapy and relaxation with or without biofeedback could improve the symptoms and psychological health of IBS patients. Yoga, meditation, self-help information and hypnotherapy could be applicable to IBS.

한국의 명문순례 (12) : 이이의 시무육조계

심재기 ( Sim Jae Gi ) 전국한자교육추진총연합회 2004 한글한자문화 Vol.57 No.-

한국의 명문순례 11 : 기대승의 이심법설

심재기 ( Sim Jae Gi ) 전국한자교육추진총연합회 2004 한글한자문화 Vol.56 No.-

한국의 명문순례 8 : 서경덕의 사직소

심재기 ( Sim Jae Gi ) 전국한자교육추진총연합회 2003 한글한자문화 Vol.53 No.-