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Wavelet cross correlation을 이용한 의식적인 의도와 무의식적인 의도에 따른 뇌활성 신호의 특징 추출
조덕기(Deok-Ki Cho),이은주(Unjoo Lee),방성근(Sung-Keun Baang),권오재(Oh-Jae Kwon),임인종(In-Jong Im),김만영(Man-Young Kim),김진희(Jin-Hee Kim) 한국정보과학회 2011 정보과학회 컴퓨팅의 실제 논문지 Vol.17 No.12
본 논문에서는 웨이블릿 상호 상관 기법을 이용하여 근적외선 분광기로부터 추출할 수 있는 slow signal에 내재되어 있는 잡음 신호의 영향을 배제하고 의식적인 의도와 무의식적인 의도에 따른 뇌활성 신호의 특징을 추출하였다. 본 논문의 실험을 위하여 기존의 choice reaction time 테스크와 n-back working memory 테스크의 프로토콜을 응용하여 의도형 추출 테스크를 고안하였으며 실험 설정 단계서 의도형 선택 설정이 가능하도록 구성하였다. 산화헤모글로빈과 탈산화헤모글로빈의 농도로부터 의도형 기반 뇌활성 신호의 특징을 추출하기 위해 Morlet 웨이블릿 변환을 수행한 후 그 결과를 상호 상관계수를 이용하여 분석하였다. 결과적으로 의도형 추출 테스크에 있어서 자극신호가 주어진 시점을 전후로 전전두엽 영역으로부터 기록되는 뇌혈류역학 신호의 특이적인 변화를 관찰할 수 있었으며 의식적인 의도와 무의식적인 의도에 따라 뚜렷이 구별되는 웨이블릿 상관 계수의 분포를 구할 수 있었다. In this study, neuronal signals related with conscious or subconscious intention were analyzed by wavelet cross-correlation estimation. The neuronal signals were recorded from the prefrontal cortexes using functional near infrared spectroscopy while subjects were carrying out intention type extraction tasks. The intention type extraction task was invented based on the conventional choice reaction time and n-back working memory experiment protocols and was carried by presetting up to one of three intention types, such as conscious intention, subconscious intention and no intention. The results showed that the neuronal signals by conscious intention type are associated with the range of the wavelet scales from 100 to 160 while those by subconscious intention and no intention types are associated with the range of the wavelet scales less than 60. The results also showed that the correlations between conscious and subconscious intention types have relatively larger values than those between conscious or subconscious intention type and no intention type.
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김정인,권오재 한국환경경제학회 한국자원경제학회 2004 자원·환경경제연구 Vol.13 No.1
기존의 환경성과지표는 환경성과와 기업경영성과와의 관계분석의 미흡, 통합 지표 개발로 인한 기업별 차이점의 간과와 기업 외부용 위주의 지표 개발 등 한계를 가지고 있어서 다양한 이해관계자들에게 유용한 정보로서 그 기능을 다하지 못하고 있다. 이러한 문제를 보완하기 위하여 AHP법을 이용하여 환경성과평과의 가중치를 산정하였다. 평가영역별 가중치는 오염물질 배출처리현황 0.38, 환경경영 일반현황 0.23, 환경개선현황 0.22 순으로 높은 수치를 나타냈으며, 환경재무현황과 환경정보 공개는 0.10, 0.08로 낮게 계산되었다. 이는 투자자들의 평가 우선순위에서 볼 때 오염물질 배출처리현황 처리자료, 환경경영 일반현황 자료, 그리고 환경개선현황 자료를 우선적으로 보고 투자 결정을 한다는 점이다. 환경친화기업에 대한 실증분석결과에서도 대중매체를 통한 환경관련 기사 건수나 환경보고서 발간 유무, 환경친화기업 지정과 ISO, 14001 인증기업 등은 환경성과의 평가를 알려주는 지수의 측정에서도 가장 중요한 역할을 하는 것으로 나왔으며 전자나 제지, 자동차 산업을 경영하는 곳에서 환경경영성과가 우수한 것으로 도출되었다. Environmental Performance Indef (EPI) has shown some limitation. Since it has lack of analysis for the relation between environmental performance and business performance, and public information. Therefore it could not provide valuable information for the shareholders to decide for the investment. In this paper by using Analytic Hierarchy Process(AHP), EPI was calculated giving some weighted scale for each environmental items. Improvement of Pollution treatment, general management data such as EMS system, and environmental improvement for the products and process were the main three items when decision makers in bankings are considering the investment for a company. In empirical case, companies which have Environmental-Friendly Coorperation Award from MOE and ISO 14001 certification have shown strong relation between business performance and environmental performance.
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요추부 질환에서 시행한 단분절 유합과 장분절 유합간의 임상 결과에 대한 비교
조재림,윤원구,권오재 대한척추외과학회 1995 대한척추외과학회지 Vol.2 No.1
In some of the lumbar sinal disorders, fusion is the method of choice for relieving spinal pain and usually one or two segments fusion is sufficient but somtimes as in degenerative spinal stenosis it is necessary to carry out three or more segments fusion. The purpose of this study is to compare the clinical results between these short and long segment fusion groups. From August 1987 to December 1992, 138 lumbar spinal disorders were operated on and followed for more than one year, the average follow up period was 2 years and 5 months. One or two segments fusion was carried out in 111 patients and three or more segments fusion in 27 patients. 49 patients were male and 89 patients were female. Most prevalent age was from 41 to 60 in both groups. Degenerative spinal stenosis was the most common etiology for operation in both groups. In all cases, pedicle screws were female. Most prevalent age was from 41 to 60 in both groups. Average operation time was 4.75 hours in short segment fusion group and 6.25 hours in long segment fusion group. Under the hypotensive anesthesia, the amount of blood loss during operation was 1520 ㎕ and 2000㎕ respectively, and the amount of postoperative suction drainage was 450㎕ and 730㎕ respectively. On clinical results, 96.4% of good to excellent results were obtained in short segment fusion group while in long segment fusion group is was 85.2% but overall clinical results had no statistical significance between these two groups. In complications, hematoma was the most frequent complication in both groups but it was more frequent in long segment fusion group. Dural tear occured in 5 patients and it was more frequent in long segment fusion group and this was the only statistically significant complication. In this series, we had no deep would infection, no nonunion and no permanant neurologic deficit.
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Colles 골절과 동반된 주관절 개산(開散) 탈구 - 1례 보고 -
김성준,권오재,황건성,임종선 대한골절학회 1995 대한골절학회지 Vol.8 No.2
Divergent dislocation of divergent elbow is very rare and this in jury has been reported only 7 cases in English literatures. This injury was affected in the disruption of all three joints of elbow, such as the radiocapitellar, the ulnotrochlear and the proximal radioulnar joint. According ta Stimson's classification, there are two types: anteroposterior and mediolateraL We experienced a case of the divergent dislocation of elbow with ipsilateral Colles' fracture which were treated by closed reduction and cast immobilization. We obtained satisfactory result.
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