K-L공간 에지 검출과 홍채 결함영역 추출에 관한 연구

이승용,류광렬 목원대학교 멀티미디어신기술연구소 2001 멀티미디어신기술연구소논문집 Vol.1 No.1

본 논문은 K-L 공간 기법으로 에지를 검출하고 홍채 진단을 위해 에지 영상 패턴 매칭을 이용하여 홍채의 결합조직 위치를 검출하는 연구이다. 에지 검출 기법은 8방향 키어쉬-라프라시언 기법을 적용하고 진단영역인식은 진단기준패턴과 입력에지영상패턴과 오버랩핑 패턴 매칭으로 결함영역을 검출하였다. 그 결과 적용한 에지 검출 영상의 PSNR이 131 정도이며 패턴 매칭 영역 인식 결과는 89%정도이며 홍채에 의한 인체의 상태를 추정하는 자동진단시스템으로 활용 할 수 있는 가능성을 제시하였다. This paper presents K-L spatial edge detection and iries defective area extraction for diagnosis by edge image pattern matching. The edge detection results from 8 directions Kirsch and Laplacian method. The defective iris area is extracted in overlapping diagnostic reference pattern with inputed edge image pattern. The results are PSNR 13 to K-L spatial edge detection and 89% for detective area recognition to lead a auto iries diagnostic system.

Pseudo-Gitelman씨 증후군 1예

김성렬,조영일,이해운,이정연,안해련,송종오,명승운 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-

Gitelman's syndrome is a rare disorder with a characteristic set of metabolic abnormalities. These include hypokalemia, metabolic alkalosis, hypocalciuria and hypomagnesemia. The clinical manifestations of Gitelman's syndrome are very similar with those of Bartter's syndrome and diuretic abuse. Gitelman' syndrome and Bartter's syndrome can be distinguished by renal clearance study after administration of furosemide and thiazide, since the primary defect in each of these disorders is an impairment in sodium reabsorption in the distal tubule and loop of Henle, respectively. Pseudo-Bartter's syndrome due to diuretic abuse can be distinguished by history of diuretic use and a positive urine assay for diuretics. We have experienced a case of pseudo-Gitelman's syndrome in 56-year old woman with unexplained hypokalemic metabolic alkalosis, hypocalciuria, and hypomagnesemia. The patient denied ingestion of diuretic medication. The results of renal clearance study using furosemide and thiazide in this case suggested the presence of the primary defect of sodium reabsorption in the distal tubule rather than in the loop of Henle. These clinical and laboratory findings were consistent with those of Gitelman's syndrome. But, this case was confirmed as pseudo-Gitelman's syndrome since diuretics were detected by a urine assay for diuretics. Furosemide and hydrochlorothiazide were contained in the pill that she had been taking due to constipation. Herein, we report the case of pseudo-Gitelman's syndrome by abuse of cathartics containig diuretics presented as Gitelman's syndrome in renal clearance study.

He 원자의 가장 낮은 들뜬 상태 에너지의 수치 계산

차혁렬,양해정,김미정,정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1

The one-electron theory of atoms, molecules, and crystals have enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the electronic structure of many-electron systems. In addition, this theory gives a convenient basis for performing the detailed calculation on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplified assumptions in order to make a progress. Since the principal computational difficulty supposed by the Hartree-Fock equations is the treatment of the exchange term, it would be very desirable to simplify the treatment of these terms by using Slater's average of the exchange potential. The first order correction of energy in the lowest excited states of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical method. The numerical results agrees with an experimental results for the lowest excited states of He atom with tolerance 3.22%, 2.16%, 2.94% and 3.41%. These results show that the numerical analysis can be applied to other multielectron atoms with the personal computer.

B형간염 항원의 消長에 영향을 미치는 각종 인자의 연구

최승렬,양용상,한성운,조미연,김선웅,신영오 한국건강관리협회 2000 건협 Report Vol.3 No.-

웨이블릿 패킷을 적용한 그레이 영상의 워터마킹에 관한 연구

이승용,류광렬 목원대학교 멀티미디어신기술연구소 2002 멀티미디어신기술연구소논문집 Vol.2 No.1

본 논문은 그레이 영상에 대한 워터마킹에 웨이블릿 패킷을 적용한 연구이다. 웨이블릿 패킷기법을 적용하여 저주파 대역에서 고주파 대역까지 손실을 최소화하므로 그레이 영상의 분해능을 향상시킨다. 비교분석 실험결과 PSNR은 0.1㏈ 이상 향상되었고 내구성 평가에서 압축률 60%에서 PSNR이 28㏈ 이상 얻었다. 결과적으로 그레이 영상의 화질이 향상되었으며 고의적인 영상왜곡 및 변형 등의 외부 공격에 대해 내구성을 유지하는 결과를 얻었다. The watermarking on gray images with wavelet packet is presented. The wavelet packet produces the enhancing the resolution from low to high band that minimize the loss on the band. The result on experiment is that PSNR is 0.1㏈ on image quality and PSNR is 28㏈ on the durability in compressed ratio 60% over. This proposal allows an enhancing and robust image to stand and oppose the distortion and modification by intention.

컴퓨터 게임과 학업성취도와의 관계 연구

구성옥,맹승렬,유관희 한국컴퓨터교육학회 2005 컴퓨터교육학회 논문지 Vol.8 No.4

ZVT DC-DC 전파 브리지 컨버터 해석 및 설계

전칠환,이수원,조승렬 群山大學校 情報通信技術硏究所 1999 情報通信技術硏究論文集 Vol.3 No.-

This paper presents an analysis and design of an optimized soft switching DC-DC full-bridge topology. Soft switching for all main switches is achieved by using a combination of phase shift control and a Zero-Voltage-Transition auxiliary network. Based on a steady-state analysis of the topology a mathematical model describing the converter behaviour is developed. The influence of the auxiliary network design on the operating range, achievable switching frequency and current stress is investigated.

전자상거래 쇼핑몰의 컨텐츠 활용에 관한 기술 동향

이승렬(Seung-Ryol Lee),윤호군(Ho-Gun Yun),정화영(Hwa-Young Jeong) 한국콘텐츠학회 2003 한국콘텐츠학회 종합학술대회 논문집 Vol.1 No.1

인터넷을 기반으로 한 전자상거래의 등장은 상거래에 있어 지역적인 제한을 없애는 역할을 하고 있다. 이것은 상거래에 있어서 지금까지의 통념을 새롭게 정립해야 하는 것을 의미한다. 즉 촉각이 우선 되던 패턴에서 벗어나 시각이 우선 되는 것을 의미한다. 전자상거래 쇼핑몰의 성패여부가 이 시각을 붙잡아 놓는 것에 있다해도 과언은 아닐 것이다. 소비자의 다양한 욕구에 부응하고 이에 맞는 컨텐츠의 개발을 통한 쇼핑몰의 구축으로 물품구매까지 연결시킬 수 있어야 한다.<br/> 따라서, 본 논문에서는 쇼핑몰 구축에 있어 소비자의 욕구를 만족시키기 위한 유용한 컨텐츠의 활용에 대해 알아보고 그 효율성에 대해 연구하였다. Entrance on the stage of electronic commerce based on internet is acting role that take away regional limitation in commercial transaction. This means that must establish common idea until now in commercial transaction newly. That is, feeler escapes in pattern that is been prior and it means that sight is been prior. We say too much may not be even if success and failure availability of electronic commerce shopping mall catches this sight. And, We Must be able to meet and attach goods purchase by construction of shopping mall through development of correct contents about in various desire of costomer.<br/> Therefore, in this paper, we recognize and studied about the efficiency of practical use for useful contents to satisfy customer's desire in shopping mall construction.

유산소운동 수준에 따른 중추신경계의 활동변화

김승열 ( Seung Ryol Kim ) 한국운동생리학회 2015 운동과학 Vol.24 No.2

PURPOSE: To primarily examine any changes in perceptive & cognitive function following maximal exercise & 3-step sub-maximal exercise that were equally set in total volume of exercise, and to secondarily examine the degree of difference in exercise in presence of changes in cognitive function. METHODS: The study recruited 6 male university student subjects. Exercise intensity increased with a 20% increment of maximum oxygen intake amount (V?O2max): 40%, 60%, 80%, and 100%. In addition, exercise time at each intensity was set with equal exercise intensity x time (min.) by considering the 100 %V?O2max intensity of reaching total exhaustion. RESULTS: There was a trend of increasing P300 amplitude after exercise. There were main effects for time and deduction area: F (1,5)=29.52, p <0.05, F (2,10)=18.8 p <0.01. Specifically for deduction area, meaningful differences were found in Fz & Cz with a significant difference either between Fz&Cz (p <0.05) between Fz & Pz (p <0.01). For exercise intensity, a significant difference (p <0.05) was found between 60% and 100% of V?O2max. In the P300 latency period, it showed differences of F(3,15)=2.78 (p <0.10) in the main effect of exercise intensity. For exercise intensity, meaningful differences were found between 40% and 60% of V?O2max (p <0.05) and between 40% and 80% of VO2max (p <0.01). In the P300 latency period of 40% of V?O2max condition, there was a trend of shortening when considering the comparison between 60% and 80% of V ?O2max exercise conditions. CONCLUSIONS: In the sensory & stimulation processing of promoting response selection for external stimulation, no differences were found between the pre- & post-exercise and exercise intensity regarding the speed of perception & cognitive functions.

사이버교육의 현황 및 발전방향

이승렬(Seung-Ryol Lee),윤호군(Ho-Gun Yun),정화영(Hwa-Young Jeong) 한국멀티미디어학회 2003 한국멀티미디어학회 학술발표논문집 Vol.2003 No.2