월수함수 단일항전개를 이용한 추적 최적제어기 설계

안두수,오현철,김민형,이재춘,이명규 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1

This paper presents the methode of optimal control theory and observer for time invariant system via Single Term Walsh Series. The algorithm of the optimal control theory is simulated by MATLAB.

안면비대칭에 대한 주관적 인지도와 정모두부방사선사진 분석치의 연관성

안정순,황현식,김창수,김경근 전남대학교 치의학연구소 2001 구강과학 Vol.13 No.3

This study was aimed how posteroanterior cephalometric measurements affect the perception of the patient about his/her facial asymmetry. One hundred orthodontic patients, over the age of 12, who required a posteroanterior cephalogram in the Department of Orthodontics of Chonnam National University Hospital were used as the subject. They were asked if they thought their faces are asymmetrical. Their responses were classified into 5 groups based on the level of asymmetry as follows : Definitely No, Probably No, Don't Know. Probably Yes, Definitely Yes. Nine linear and four angular measurements from each posteroanterior cephalometric radiographs were analysed on the standard of the line between crista galli and anterior nasal spine to show the extent of asymmetry. Through this comparative study, the following results were obtained. 1. As the deviation of menton and the midline discrepancy of the upper and lower jaws were greater, the perception of patients about their facial asymmetry was higher. 2. All the measurements from the group "Don't Know" showed no statistical difference with those of the groups "Definitely No" or "Probably No." 3. All the measurements from the group "Probably Yes" showed no statistical difference with those of the group "Definitely Yes." The above results suggest that it may be helpful for the orthodontic diagnosis to ask patients' perception of their own facial asymmetry.

공급사슬관리의 전략적 과제에 관한 탐색적 연구

안병훈,이승규,정희돈,안현수 한국경영과학회 1997 經營 科學 Vol.14 No.1

This study addresses strategic issues related to the question of "how can a supply chain become more competitive?" We examine several cases of manufacturing supply chains. Results show that each constituent firm is required to maintain different manufacturing capabilities and to play different roles by its position (up/mid/down-stream) in a chain. Furthermore, there are patterns of required capabilities by the positions in a chain. These findings imply that the "position in a chain" should be treated as one of the strategic factors when discussing the buyer-seller relationship. It is also shown that different action programs are required for building different manufacturing capabilities of individual firms in a supply chain. Additionally, we argue that some programs need to be done simultaneously, by all the members of the chain, while some need to be carried out by only a small group or an individual firm. Finally, we propose a direction for a theoretical framework for analyzing supply chain structures and strategies.

모 컴퓨터 회사 근로자 건강증진 사업 전개를 위한 수요조사

임현우,안병용,최환석,박정일,김경수,이강숙,김정아,구정완 가톨릭대학산업의학쎈타 산업의학연구소 1997 韓國의 産業醫學 Vol.36 No.4

Before conducting the health promotion program, we surveyed the health risk appraisal(HRA) of 210 workers (186 men and 24 women) in a computer company, for the need assessment, selection of target population, priority setting, and as a standard for comparision after performing the program. The smokers were 115(88.6%), and drinkers (over 1 bottle of Soju per week) were 91(44.8%) in men. Entire women and 148(78.0%) men never or irregularly exercise. Type A personality were 73(39.2%) in men, 8(33.3%) in women, and 26(14.0%) of men and 6(25.0%) of women were high stress risk group. 53(25.2%) of men and 2(8.3%) of women were obese (BMI ≥25kg/m²), and workers who consumed exess of total calory compared with recommendation were 142(76.3%) in men and 18(75%) of women. By the health risk appraisal, it was suggested that smoking cessation program, drinking counselling, exercise prescription, stress management, and weight control program should be conducted effectively for the high risk group.

생태적 도시계획을 위한 생태기반지표의 개발과 활용에 관한 연구(Ⅱ)

김현수,안근영,장대희 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

With environmental problems and pollutions accumulated by continuous urban development projects, it is becoming necessary to develop in consideration of environmental effects. On this study, it is suggested the critical point of biotope space factor and the supplement device. Natural ground area ratio is functioned as important factor in urban area. So in region, high-rated in natural ground area ratio, or in new urban development area, it is necessary to get supplement tool for conserving preferentially natural ground area. And it is considerable to ply individual environment planning indicator in case of need. This study has main contents as follows; biotope space factor was applied to actual case, rebuilding housing complex in Cham-sil to diagnosis ecological level and to lead more ecologically sound plan. After considering all the factors there was the critical point in using as just one tool, biotope space factor, so we suggested supplement device to solve this problem for an example, by regional characteristics, biotope space factor and individual environmental planning factor will be used together.

멀티미디어 정보를 이용한 전주 박물관 안내 시스템 : 오일석

안현수,김종훈 全北大學校 敎育大學院 1995 敎育論叢 Vol.15 No.-

Recently, many a multimedia software is introduce named CD-title due to equipment of multimedia environment. This paper describes design and implement of multimedia program for guidance of cultural assets and a way of use possessed in a national Chonju museum. Our system use ToolBook as authoring tools, designs system for convenience of user to the highest degree considered. Different point from others provides image enlargement and image processing ability for more delicate observance about surface of cultural assets. Image enlargement is composed of five steps, provides image processing such as bright control and edge enhancement and implement interface through combination of C-routine and ToolBook.

대퇴동맥을 통한 경피적 관동맥 중재시술 환자의 천자부위 지혈을 위한 Angioseal^(�) 사용과 고식적 용수 압박법의 비교 : 전향적 연구

김용훈,권현철,김필호,안석진,유철웅,최진호,이상철,김준수,김덕경,전은석,이상훈,홍경표,박정의,서정돈 대한내과학회 2004 대한내과학회지 Vol.66 No.5

목적 : 경피적 관동맥 중재술은 최근 양적 및 질적으로 급격한 발전을 보였지만 시술 시 천자부위의 혈관 합병증은 아직 해결해야 할 문제점이다. 저자들은 대퇴동맥을 통한 경피적 관동맥 중재술을 환자에게 천자부위 지혈을 위한 혈관폐쇄기구인 안지오실의 안전성과 유용성을 고식적인 용수 압박법과 비교 연구하고자 하였다. 방법 : 2002년 4월부터 2003년 5월 사이에 삼성서울병원 심장혈관센터에서 대퇴동맥을 통한 경피적 관동맥 중재술을 성공적으로 시행한 200명의 환자(안지오실 사용군: A군, 100명, 고식적 용수압박법 사용군 B군, 100명)를 대상으로 시술 후 주요 합병증 및 경한 합병증, 지혈 후 환자가 자리에 앉기까지의 시간, 보행개시 가능시간, 총 재원 기간과 시술 1주 후의 합병증을 전향적으로 조사하여 비교 연구하였다. 결론 : 두 군에서 연령, 성별, 기저질환, 심혈관 질환의 위험요소, 시술의 종류, 시술 중 사용한 헤파린의 양, clopidogrel의 양, ticlopidine의 양, 지혈 시 수축기와 확장기혈압, ACT (activated clotting time)는 차이가 없었다. A군이 B군에 비해 시술 후 자리에 앉기까지의 시간 (A군: 4.3±0.3시간, B군: 13.7±0.8시간, p=0.004) 및 보행개시까지의 시간(A군: 6.8±0.5시간, B군: 18.8±2.1시간, p=0.013)이 유의하게 짧았다. 시술 후 주요 합병증은 두군 모두에서 관찰되지 않았으며, 경한 합병증의 전체발생은 A군에서 유의하게 적었다(A군: 28명, B군: 19명, p=0.003). 반상출혈의 경우는 A군에서 유의하게 낮았지만(A군: 3명, B군: 12명, p=0.01), 혈종, 출혈의 발생은 두군간에 차이가 없었다. 총 재원기간에는 두 군간에 차이가 없었다(p=0.239). 시술 1주 후 경과관찰에서 주요합병증은 역시 두 군 모두에서 관찰되지 않았으며, 경한 합병증의 전체발생은 두 군에서 차이가 없었다(A군: 15명, B군: 13명 p=0.418), 반상출혈의 빈도는 차이가 없었지만 혈종의 발생은 A군에서 더 낮았다(A군: 2명, B군:6명, p=0.004). 두 군 모두에서 출혈은 발생하지 않았다. 결론 : 대퇴동맥을 통한 경피적 관동맥 중재술을 시행한 환자에서 안지오실의 사용은 고식적 용수 압박법에 비해 환자의 침상 안정시간을 줄여 조기 활동개시가 가능하게 하였으며 국소합병증의 위험도를 일부 낮추어, 시술에 따른 환자의 불편을 현저하게 감소시킬 수 있다고 할 수 있을 것으로 기대된다. Background : Although the number and the quality of percutaneous coronary intervention have been recently increased dramatically, the vascular complication at puncture site is still the major cause of patients' morbidity. We evaluated the safety and efficacy of newly of newly-developed collagen-based arterial closure device, Angioseal after transfemoral percuatenous coronary intervention. Methods : This study was designed as a prospective single center non-randomized comparative study. A total 200 patients undergoing transfemoral percutaneous coronary intervention were enrolled between April 2002 and May 2003. They were divided into two groups; Angioseal group (group A, n=100) and manual compression group (group B, n=100). The baseline clinical and angiographic characteristics were reviewed. The time to sit up, the time to ambulation, the duration of hospital stay, major and minor vascular puncture site complications were monitored. The patients were followed-up for 1 week after procedure by telephone. Results : The baseline clinical characteriwtics, clinical diagnosis, cardiocascular risk factors, typesof procedure, doses and numbers of anticoagulants were similar between two groups. The blood pressure and activated clotting time were also similar. The time to sit up (group A: 4.3±0.3 hours, group B: 13.7±0.8 hours, p=0.004) and the time to ambulation (group A: 6.8±0.5 hours, group B: 18.8±2.1 hours, p=0.013) were shorter in group A. No major vascular complications were noted. The incidence of hematoma and bleeding were not significantly different between two groups. The incidence of ecchymosis, however, was significantly lower in group A (group A:12%, group B: 3%, p=0.001) The duration of gospital stay was similar between groups. During 7 days of follow-up period incidence of hematoma was significantly lower in group A (p=0.004). Although the incidence of ecchymosis was not significantly different between two groups. Conclusion : The angioseal may be associated with earlier ambulation and less patients' morbidity with low incidence of local complication rate compared to manual compression after transfemoral percutaneous coronary intervention.

정보통신 서비스의 실패 요인 : 한국의 텔레콤 서비스시장에서의 실패사례연구

안재현,권재원,김명수,이동주,이상윤,한상필 한국경영과학회 2002 한국경영과학회지 Vol.27 No.3

In this paper, 15 South Korean telecommunications service failure cases were analyzed. Through the in-depth case study, 8 factors were found to be the major causes contributing to the telecommunications service failure. They were (1) ineffective marketing, (2) poor demand forecasting due to misjudgment of customer preference, (3) failure to satisfy technical specifications, (4) loss of cost advantage due to the price cut of competing service or new entry with power price, (5) loss of utility advantage due to the increased utility of competing service or new entry with higher utility (6) decrease of market attractiveness due to change of customer preference, (7) impact of government policy, and (8) insufficient or low quality of contents. Additional analysis was done to derive managerial implications to the new telecommunications service development strategy. The findings from the paper will provide valuable insight to the successful implementation of new service development and service provisioning processes.

Effects of long-term scopolamine treatment on cognitive deficits and calcium binding proteins immunoreactivities in the mouse hippocampus

Ahn, Ji Hyeon,Chen, Bai Hui,Yan, Bing Chun,Park, Joon Ha,Kang, Il Jun,Lee, Tae-Kyeong,Cho, Jeong Hwi,Shin, Bich-Na,Lee, Jae-Chul,Jeon, Yong Hwan,Hong, Seongkweon,Lee, Young Joo,Choi, Soo Young,Won, Mo SPANDIDOS PUBLICATIONS 2018 MOLECULAR MEDICINE REPORTS Vol.17 No.1

<P>GABAergic projections terminate on numerous hippocampal interneurons containing calcium binding proteins (CBPs), including calbindin D-28k (CB), calretinin (CR) and parvalbumin (PV). Memory deficits and expression levels of CB, CR, and PV were examined in the hippocampal subregions following systemic scopolamine (Scop; 1 mg/kg) treatment for 4 weeks in mice. Scop treatment induced significant memory deficits from 1 week after Scop treatment. CB, CR and PV immunoreactivities distributions were in hippocampal subregions [CA1 and CA3 regions, and the dentate gyrus (DG)]. CB immunoreactivity (CB<SUP>+</SUP>) was gradually decreased in all subregions until 2 weeks after Scop treatment, and CB<SUP>+</SUP> was decreased to the lowest level in all subregions at 3 and 4 weeks. CR<SUP>+</SUP> in the CA1 region was gradually decreased until 2 weeks and hardly observed at 3 and 4 weeks; in the CA3 region, CR<SUP>+</SUP> was not altered in all subregions at any time. In the DG, CR+ was gradually decreased until 2 weeks and lowest at 3 and 4 weeks. PV<SUP>+</SUP> in the CA1 region was not altered at 1 week, and gradually decreased from 2 weeks. In the CA3 region, PV<SUP>+</SUP> did not change in any subregions at any time. In the DG, PV<SUP>+</SUP> was not altered at 1 week, decreased at 2 weeks, and lowest at 3 and 4 weeks. In brief, Scop significantly decreased CBPs expressions in the hippocampus ≥3 weeks after the treatment although memory deficits had developed at 1 week. Therefore, it is suggested that Scop (1 mg/kg) must be systemically treated for ≥3 weeks to investigate changes in expression levels of CBPs in the hippocampus.</P>

Successful introduction of Model for End-stage Liver Disease scoring in deceased donor liver transplantation in Korea

Soo-Min Ha,Shin Hwang,Gi-Won Song,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Dong-Hwan Jung,Gil-Chun Park,Ki-Hun Kim,Dae-Yeon Kim,Jungman Namgung,Woo-Hyoung Kang,Seok-Hwan Kim,Eunkyoung Jwa,Jae-Hyeon Kwon 한국간담췌외과학회 2017 Annals of hepato-biliary-pancreatic surgery Vol.21 No.4

Backgrounds/Aims: Model for End-stage Liver Disease (MELD) score was adopted in June 2016 in Korea. Methods: We analyzed changes in volumes and outcomes of deceased donor liver transplantation (DDLT) for 1 year before and after introduction of MELD scoring at Asan Medical Center. Results: There were 64 cases of DDLT in 1 year before MELD introduction and 106 in 1 year after MELD introduction, an increase of 65%. The volume of DDLTs abruptly increased during first 3 months, but then returned to its usual level before MELD introduction, which indicated 3-month depletion of accumulated recipient pool with high MELD scores. The number of pediatric DDLT cases increased from 3 before MELD introduction to 11 after it, making up 21.4% and 47.8% of all cases of pediatric liver transplantation, respectively. The number of cases of retransplanted DDLTs increased from 4 to 27, representing 6.3% and 25.5% of all DDLT cases, respectively. The number of status 1 DDLT cases increased from 5 to 12, being 7.8% and 11.3% of all cases. Patient survival outcomes were similar before and after MELD introduction. Conclusions: The number of DDLTs temporarily increased after adoption of MELD scoring due to accumulated recipient pool with high MELD scores. The numbers of retransplanted and pediatric DDLT cases significantly increased. Patient survival in adult and pediatric DDLT was comparable before and after adoption of MELD scoring. These results imply that Korean MELD score-based allocation system was successfully established within its first year.