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김기준,오용철,이경섭,정한석,김탁용,최미희,송민영,신철기,김진사,Kim, Ki-Joon,Oh, Yong-Cheul,Lee, Kyeong-Seob,Jung, Han-Seok,Kim, Tag-Yong,Choi, Mi-Hui,Soung, Min-Yeong,Shin, Cheol-Gi,Kim, Jin-Sa 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
We use the electrical energy and it is essential energy in modern life, but we lay cable underground due to the issue for environment and safety. Safety for worker is still insufficient for the development of safety equipment and related research has been focused on the cable lifetime diagnosis at underground cable work. I have to develop live line detector around the magnetic field were investigated at underground cable. In this paper, we were investigated by variation of coil turns and load due to detection of magnetic field at lines around. And detected value of developing products compared with measured value of milli-gauss meter. As a result, the value of the number of coil turns was found to be proportional to the measured value. But turn-numbers increase showed that the weak noise. I could be confirmed that sensor showed the optimum value from 4,000 to 5,0000.
Electromagnetic Field Analysis of Magnetic Bearing due to Stator Structure
김기준,신철기,Kim, Ki-Joon,Shin, Cheol-Gi The Institute of Electronics and Information Engin 2011 電子工學會論文誌 IE (Industry electronics) Vol.39 No.4
본 연구에서는 스테이터 구조에 의한 마그네틱 베어링의 전자장해석을 수행하였으며 AMB 시스템의 설계 기준을 얻기 위하여 3가지 방식의 구조에서 전기적 특성을 구하였다. FEM 기법을 이용하여 AMB의 3가지 방식을 시뮬레이션한 결과, 1, 2, 그리고 3번 방식은 N극에서 S극으로 많은 자속선 벡터가 이동하는 것으로 나타났으며, 이 자속선들은 로타로 전달되고 있다. 이 선들은 로타가 회전하는 것을 도와주고 있다. 따라서, 이러한 전기적 특성 자료는 마그네틱 베어링 설계자료로 이용되고, 설계 기준을 만드는데 도움이 될 것이다. In this study, it carried out Electromagnetic Field Analysis of Magnetic Bearing due to stator structure and it got the electrical characteristics of 3 structure types of AMB(Active magnetic bearing) systems to get optimal design criteria. The results of simulation in three types of AMB, using FEM method, type 1, 2, and 3 had many paths to move magnetic flux vectors from N pole to S pole and magnetic flux lines are transferred to rotor as a shaft. The paths help to rotate the rotors. So, their data of electrical properties carry out design of magnetic bearing system and the data help to make design criteria.
김영욱 ( Young Wook Kim ),최황 ( Hwang Choi ),김기준 ( Gi Jun Kim ),류승지 ( Seung Jee Ryu ),박성민 ( Sung Min Park ),김준성 ( Joon Sung Kim ),지정선 ( Jeong Seon Ji ),김병욱 ( Byung Wook Kim ),이보인 ( Bo In Lee ),최명규 ( Myung 대한소화기학회 2016 대한소화기학회지 Vol.67 No.2
목적: 혈변 환자 평가를 위해 대장내시경이 꼭 시행되어야 하는 것이 아님에도 불구하고, 일반적으로 국내에서 의사들은 혈변을 주소로 내원한 환자들에게 대장내시경을 권고하고 있다. 이번 연구는 혈변 평가를 위해 시행된 대장내시경의 진단적 가치를 확인하고자 하였다. 대상 및 방법: 총 321명의 혈변 환자를 대상으로 후향적으로 대장내시경 결과를 검토하였다. 결과: 치핵이 가장 흔한 진단이었고(217예, 67.6%) 선종은 그다음으로 흔한 발견 병소였다(93예, 29.0%). 악성 종양(18예, 5.6%)은 모두 구불결장 이하 범위에서 확인되었다. 결장염 및 직장염, 급성 치열, 직장 유암종, 숙변 궤양 등은 임상적 추정 및 구불결장경에 의한 진단이 가능하며, 정확한 진단을 위한 대장내시경의 추가적 이득은 없었다. 결론: 대장내시경이 유발하는 부작용 및 비용을 고려할 때 혈변 평가에 있어 구불결장경 이상의 이득은 제한적이다. 그러므로 혈변 평가에 있어 우선 구불결장경을 고려하여야 한다. Background/Aims: Although colonoscopy is not indicated in patients with hematochezia, many surgeons, internists, and physicians are recommending colonoscopy for these patients in Korea. The aim of this study is to evaluate the diagnostic value of colonoscopy for patients with hematochezia. Methods: We retrospectively reviewed the data of colonoscopy between January 2010 and December 2010. A total of 321 patients among 3,038 colonoscopies (10.6%) underwent colonoscopy to evaluate the cause of hematochezia. The patients with previous colorectal surgery (2) or polypectomy (5) were excluded. We analyzed endoscopic diagnoses. Advanced neoplastic polyps were defined as adenomas with villous histology or high grade dysplasia, or adenomas more than 10 mm in diameter. Results: Hemorrhoid was the most common diagnosis (217 cases, 67.6%). Polyps were detected in 93 patients (29.0%), but advanced neoplastic polyps were found in only 14 cases (4.4%). Colorectal cancers were diagnosed in 18 patients (5.6%) including 14 rectal cancers. There was no cancer located above sigmoid-descending junction. Diverticuli were detected in 41 patients (12.8%) but there was only one case of suspected diverticular bleeding. Colitis was diagnosed in 24 patients (7.5%). Other lesions included acute anal fissure, rectal tumor, stercoral ulcer, and radiation proctitis. Conclusions: The colonoscopy had little value in patients with hematochezia because the most pathologic lesions were located below sigmoid colon. The first choice of diagnosis in patients with hematochezia is sigmoidoscopy.
카멜리나 (Camelina sativa Crtz.) 발아 적온 및 발아초기 뿌리생육 특성
박준성(Joon Sung Park),최영인(Young In Choi),김용휘(Augustine Yonghwi Kim),이상협(Sang Hyub Lee),김경남(Kyung-Nam Kim),서미정(Mi Chung Suh),김기준(Gi-Jun Kim),이긍주(Geung-Joo Lee) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.3
A genus Camelina has been attracted as a promising oil crop, especially available in drought and marginal conditions. Due to more demands on arable land for bioenergy crops, price of agricultural products has been a challengeable issue. In that respect, development of Camelina crop with higher germination rate and germination energy can be a strategy to secure seedling establishment, nutrient uptake and long vegetative period. In order to be easily available in the field and laboratory conditions, Camelina seed needs to be optimized for its germination temperature. Germination temperature regime was in a range of 8 to 32℃ initially, and consecutively narrowed down to 8 to 20℃. Based on the temperature range, Camelina germinated greater than 96% at 8-16℃ in two weeks after sowing, but germination rate started to decrease at the higher than 24℃ and was significantly low at higher than 32℃. In terms of rapid time to reach the maximum germination rate and greater germination energy, temperature ranged from 12 to 16℃ was found to be desirable for Camelina germination. Although germinationa rate was greater at 16℃, lower temperature close to 12℃ would be favored for the field conditions where greater root growth leading to healthier seedlings and better nutrient or water availability is considerably demanded.
김청빈 ( Chung-bin Kim ),김기준 ( Gi-joon Kim ),김현정 ( Hyun-jung Kim ),원일용 ( Il-yong Won ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
본 논문은 영상에서 불완전한 얼굴을 인식하는 방법으로 얼굴의 각 객체를 검출하여 특징을 비교하는 방법을 제안한다. 부분적 요소 즉,얼굴의 눈,코,입을 각각 PCA(Principal component analysis)와 LDA(Linear discriminant analysis)를 이용해 특징을 주출한 등록된 데이터베이스와 비교하여 신원을 확인한다. 본 논문에서 제안하는 방법의 성능을 검증하기 위해 실험으로 증명하였으며,기존에 제안된 방법들보다 현저히 높은 인식률을 보였다.
남윤정 ( Yun Jung Nam ),김병욱 ( Byung-wook Kim ),김준성 ( Joon Sung Kim ),김기준 ( Gi Jun Kim ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.3
Sporadic non-ampullary duodenal adenoma is uncommon and found incidentally during endoscopic examinations. Brunner`s gland hyperplasia is commonly encountered during endoscopic examinations. Adenomas arising from Brunner`s gland hyperplasia originate from the glandular cells, and the surface epithelia are usually intact. Little has been reported on adenomas originating from the surface epithelium that overrides Brunner`s gland hyperplasia. Here, we report a case of a sporadic non-ampullary duodenal adenoma overriding the cystic dilatation of Brunner`s gland hyperplasia. (Korean J Gastroenterol 2017;70:141-144)