카오스 해석법을 이용한 전방십자인대 재건수술 환자와 정상인의 보행연구

고재훈(Jae Hun Ko),손권(Kwon Son),박정흥(Jung Hong Park),서정탁(Jeung Tak Suh) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2

Anterior cruciate ligament(ACL) injury of the knee is common and a serious ACL injury leads to ligament reconstruction surgery. Gait analysis is used to identify the result of surgery. The purpose of this study is to numerically evaluate and classify knee condition of patients through the chaos analysis. Experiments were carried out for 13 subjects(8 healthy subjects, 5 ACL deficient patients) walking on a treadmill. Sagittal kinematic data of the right lower extremity were collected by using a 3D motion analysis system. The recorded gait patterns were digitized and then coordinated by KWON3D. The largest Lyapunov exponent from the measured knee angular displacement time series was calculated to quantify local stability. It was found that the Lyapunov exponent becomes larger as the knee condition becomes worse. This study suggested a method of the severity of injury and the level of recovery. The proposed method discerns difference between healthy subjects and patients.

Piezocone과 Rowe Cell을 利用한 水平壓密係數 推定

권기복,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.1

Site characterization is one of the most important performances in projects with regard to solving geotechnical problems. Piezocone penetration test is a fast, economic, and accurate method of site characterization. Static cone penetrometer and the piezocone represents the most versatile tools currently available for soil exploration. The cone penetration and piezocone tests provide continuous sounding capability and repeatability. Rare of consolidation parameter may be assessed form the Piezocone test by measuring the dissipation or decay of pore pressure with time after a stop in penetration. And many researches have been developed to determine the horizontal coefficent of consolidation from the Piezocone test. Many of these researches using a theoretical solutions which is determined from either the cavity expantion theory or the stress path method. However, depending on assumptions and analytical techniques, the results can be varied considerably. For that reason, many researchers make their effort to improve and complement the defect of already established methods. In this dissertation, the correlation between the Coefficient of Consolidation from Piezocone dissipation test and the Coefficient of Consolidation Rowe Cell horizontal consolidation test in many cases was studied. The purpose of this study is to know the changing of the Coefficient of Consolidation by loading condition while Rowe Cell horizontal consolidation test is used

웹캐스팅 규제에 관한 법제적 쟁점

권헌영 한국정보사회진흥원 2005 정보화정책 Vol.12 No.4

인터넷방송으로 일컬어지는 웹캐스팅은 통신방송융합 환경에서의 규제 문제를 잘 보여준다. 웹캐스팅은 인터넷을 통해 서비스되는 방송유사서비스로 우리 방송법에서는 방송사업자의 서비스는 방송으로 규율하고 통신사업자의 서비스는 통신으로 규율한다. 동일한 내용의 서비스가 다른 규율체계에 의하여 규제되는 문제점을 갖고 있는 것이다. 통신방송융합 환경에서 미래지향적 규제의 틀을 갖추기 위해서는 구조규제와 행위규제의 조화가 필요하다. 이러한 틀로서 공화주의적 구조규제와 층위규제의 조화는 새로운 환경에서의 규제방향을 설정하는 데 유용하다. 현재 논란을 일으키고 있는 방송통신 규제제도 개편에 있어서는 층위규제의 체계에 따라 네트워크와 컨텐츠를 분리하는 것과 매체 영향력을 고려하여 평등한 규제의 틀을 마련하는 것이 필요하다. 이는 논란에 있어서 보다 유연한 자세를 요구하는 것이다. 웹캐스팅에 관하여서는 아직은 규제성숙도가 충분하다고 보기 어려우므로 새로운 서비스가 사회적∙산업적으로 자리 잡을 수 있도록 하는 산업육성적 고려와 자율규제적 고려가 우선되어야 한다.

전자정부시대 개인정보보호법제의 쟁점

권헌영 한국정보사회진흥원 2004 정보화정책 Vol.11 No.3

우리나라는 전자정부선진국임을 자부하고 있다. 전자정부에서는 개인정보를 포함하여 모든 행정정보를 전자화하고 네트워크시스템에 의하여 정보를 처리하게 된다. 정보시스템으로 연계된 전자정부에서 개인정보처리는 필수불가결한 것으로서 기존의 개인정보보호제도는 이러한 환경에 맞는 체계로 탈바꿈하여야 한다. 교육행정정보시스템(NEIS)과 관련한 사회적 논의로 대표되는 우리사회의 합의는 이러한 체계를 구체화하고 사회적으로 용인할 수 있는 수준의 제도정립을 요구하고 있다. 이러한 논의는 현재 개인정보보호기본법의 제정을 둘러싼 논의로 전개되고 있다. 기본법을 중심으로 체계화된 법제에서는 개인정보를 구체화하고 분류체계를 정립하여 그에 맞는 제도적 방안을 강구하여야 한다. 또한 국무총리소속의 독립성과 전문성 및 실질적 조사·감독 및 구제권을 가진 합의제 기구를 감독기구로 설치하여야 한다. 제도의 구체화·체계화 및 신뢰 가능한 기구의 설치는 개인이 국가를 믿고 전자행정에 적극적으로 참여하게 하는 시발이 될 것이다.

부비동 내시경수술 후 비음도 변화

동헌종,김선일,권중근,윤영선,강수미,추광철 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

관상동맥 질환에서 도플러 심초음파도로 측정한 확장기 좌심실기능의 지표와 혈역학적 소견과의 비교 검토

임헌관,기신영,유창범,최태명,김성구,권영주 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

Background : Left ventricular diastolic dysfunction is now recognized as a significant cause of cardiac symptoms even in patient with normal systolic ventricular function. During the last several years, the use of Doppler echocardiography for assessing left ventricular diastolic function has attracted increased attention. Doppler study have demonstrated that patients with ischemic heart disease have abnormal diastolic filling pattern suggesting impaired relaxation. Methods : This study was designed to correlate Doppler mitral flow velocity patterns and measuared variance with hemodynamic findings in 33 patients: 10 with myocardial infarction(group 1), 10 with angina pectoris(group 2) and 13 with no coronary disease(group 3). Results: 1. E/A ratio (0.87±0.24 m/sec versus 1.09±0.91 m/sec, P<0.05) was lower in group 1 than in group 3. 2. Significant correlation were demonstrated between pulmonary capillary wedge pressure (PCWP) and isovolumic relaxation time(IVRT) (r=-0.58; p<0.001), and E velocity (r=0.61; p<0.005). 3. IVRT was (61±30msec versus 92±35msec, p<0.05) shorter in patients with PCWP>10mmHg than in patients with PCWP≤10mmHg. Conclusion: Doppler mitral flow recordings have partially clinical potentiality in assessing left ventricalar diastolic function in patient with ischmic heart disease.

학생청소년의 불안성향과 문제행동 유형간의 상관분석

김헌수,이재우,나철,김영돈,김민호,김은희,권지란,박광식,이길홍,민병근 중앙대학교 의과대학 의과학연구소 1987 中央醫大誌 Vol.12 No.4

The purpose of the present study was to examine the relationship between their problem behavioral pattern and anxious trends among Korean student adolescent. Zung's measurement of anxiety level undergone through used of the self-rating anxiety scale. the data were collected through the questionaire survey which was conducted on Dec.1, 1983. Subjects served for this atudy consisted of 1,404 syudents in Korea, randomly sampled from Korean student population by means of census method. The data were analysed by CDC-174 computer of KAIST, using SPSS pogram. Statistical methods empoyed were χ^2 test and Eta measures. the results of this study were as follows. 1. It showed that students psychological anxious trends had greatest significant correlation with adolescent student's problem brhavioral pattern, but the cardiovascular, respiratory, gastrointestional and genitourinary anxious trends has not significantly related with student's problem behavioral pattern. 2. Students group with undersocialized aggressive, undersocialized nonaggressive,undersocialized school-norm avoidant, or socialized nonaggressive behavioral patterns were less anxious, whereas those with socialized latent aggressive, socialized sexual, or socialized modellong behavioral patterns were higher anxious.

한국판 사건충격척도 수정판의 신뢰도 및 타당도 연구

은헌정,권태완,이선미,김태형,최말례,조수진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : The present study was conducted to explore the reliability and validity of the "Impact of Event Scale-RevisedKorean version" (IES-R-K). Methods : The subjects were college students who visited a college counseling center and patients who were admitted to a general hospital and two orthopedic local clinics.Those subjects who experienced catastrophic traumatic events were tested for CAPS, BDI, STAI-I, II, and MMPI-PTSD scale. Results : The range of correlations between item-total were .45 -.89. The coefficients of internal consistency were .69 -.83, of them were the Split-half reliability was .71 and the test-retest reliability was .89, all within expected ranges. Inter-corre-lations of IES-R-K, CAPS, BDI, STAI-I, II, and MMPI-PTSD scale were high. CAPS showed the highest correlation Coef-ficient. Factor analysis indicated 4 factors in IES-R ; avoidance, hyperarousal, intrusion, and sleep problem & numbness. IES-R-K can be a useful self-rating diagnostic instrument for PTSD symptoms to be a clinical concern by using 24/25 cutoff in total score. The partial PTSD cutoff score is 17/18. Conclusion : The IES-R-K was confirmed in it's reliability and validity. IES-R-K could be applied for screening of PTSD.

비대칭 외판원문제에서 호의 후보집합 결정

김헌태,권상호,지영근,강맹규 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2

The traveling salesman problem (TSP) is an NP-hard problem. As the number of nodes increases, it takes a lot of time find an optimal solution. Instead of considering all arcs, if we select and consider only some arcs more likely to be included in an optimal solution, we can find efficiently an optimal solution. Arc candidate set is a group of some good arcs. For the Lack of study in the asymmetric TSP, it needs to research arc candidate set for the asymmetric TSP systematically. In this paper, we suggest a regression function determining arc candidate set for the asymmetric TSP. We established the function based on 2100 experiments, and we proved the goodness of fit for the model through various 787 problems. The result showed that the optimal solutions obtained from our arc candidate set are equal to the ones of original problems. We expect that this function would be useful to reduce the complexity of TSP.

상악동구강 누관

현건수,권현오,양훈식,김중환 중앙대부설한국의과학연구소 1985 한국의과학 Vol.17 No.3