생활하수 및 산업폐수가 유입되는 수영천의 수질특성

이헌모,곽영규 동의공업대학 1999 論文集 Vol.25 No.1

Su-young Cheon is one of the severely polluted streams by domestic sewage and industrial wastewater. A study was carried out at downstream of Su-young Cheon in order to evaluate the effect of domestic sewage and industrial wastewater on water quality. The range and mean values of water quality in Won-Dong bridge were as follows: DO were 0.6-5.7mg/l and 3.82mg/l. SS were 12-79mg/l and 38.4mg/l. BOD 1.6-5.1mg/l, 3.17mg/l, COD 22.4-71mg/l, 39.6mg/l, NH4-N 0.28-1.49mg/l, 2.33mg/l, T-N 0.95-3.92mg/l, 1.76mg/l. In case of T-P were 0.14-0.77mg/l and 0.21mg/l. The range and mean values of water quality in Minrak bridge were as follows: DO were 3.3-5.6mg/l and 4.26mg/l. SS were 11-96mg/l and 53.7mg/l. BOD 0.8-4.7mg/l 2.75mg/l, COD 20-41mg/l, 29.6mg/l, NH4-N 0.02-1.98mg/l, 0.58mg/l, T-N 0.64-2.6mg/l, 1.76mg/l. In case of T-P were 0.12-0.88mg/l and 0.37mg/l.

진화계획법(EP)을 이용한 산업체 열병합발전시스템의 일간 최적운전계획

류승헌,김규호 永同大學校 1998 硏究論叢 Vol.4 No.1

본 논문에서는 진화계획법(Evolutionary Programming, EP)을 이용하여 산업체 열병합발전시스템의 일간 최적운전계획을 수립하였다. 최적운전 대상 열병합발전시스템은 축열조와 전기저장장치를 포함하는 복잡한 시스템을 선택하였다. 일간 최적운전계획은 산업체의 열부하와 전기부하를 공급하는데 필요한 일간 총 에너지비용을 최소화하도록 수립하였다. 에너지비용 계산시 열병합발전시스템의 연료비 뿐만 아니라 산업체의 전기비용까지 고려하였다. 실계통 시뮬레이션을 통하여 복잡한 열병합 발전시스템의 일간 최적운전계획을 진화계획법을 이용하여 신속하게 수립할 수 있음을 입증하였고, 동적계획법에 의한 최적운전계획 결과와 비교함으로써 그 정확성을 검증하였다. This paper presents the establishment of an optimal daily operation scheduling for the industrial cogenertion system using EP(Evolutionary Programming). The industrial cogeneration system has both thermal storage tank and electrical storage facility. The minimum energy cost for thermal and electrical loads is calculated through optimal daily operation scheduling. The total energy cost includes both fuel costs and electrical rates imposed to the industry. Through the real system simulation, it is verified that the optimal operation scheduling can be established fastly and accurately by the use of EP.

관절 내시경술에 의한 퇴행성 슬관절염의 치료

김동헌,장병춘,신규철,이재성 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-

The arthroscopic surgery is an increasingly accepted procedure for the treatment of symptomatic arthritic knee. Authors reviewed the operative results of arthroscopic surgery in 35 knee joints of 27 patients from 1993 to 1997. 1. The average age of patients was 64 years old and the primary diagnosis was degenerative osteoarthritis in all patients. 2. Preoperative symptomes and signs were pain(98%), tenderness(85%), swelling(85%), decreased range of motion(71%) and effusion(55%). 3. The operative procedures were irrigation and synovectomy(20%), abrasion arthroplasty(57%), partial menisectomy and abrasion arthroplasty(23%). 4. The symptoms and signs were improved postoperatively: according to Nine point scale, the good results were recorded at postoperative 6 months and follow-up 2 years in nearly all patients. 5. The complications were minimal. Authors concluded that arthroscopic surgery is considered as a reliable method in the treatment of degenerative osteoarthritis of the knee but not as a curable method, needing a long term observation.

선천성 골 조갑 이형성증 : A Case Report 1례 보고

황규광,이원각,김동헌 건국대학교 의과학연구소 1993 건국의과학학술지 Vol.3 No.-

The Onycho-osteodysplasia is characterized anomalies of nails associated various skeletal dysplasia-knee, pelvis, elbow and others. The condition is usually transmitted as a simple autosomal dominant gene. The authors experienced one case of Onycho-osteo dysplasia showing dystropies of mails and hypoplastic patellae in a 4-year-old boy.

괴사후성과 비괴사후성 간경변증에서 원인별 주석교질 (^99mTc-tin colloid) 간스캔의 차이

이헌영,허승식,이강욱,정현용,김삼용,신영태,김영건,노흥규 충남대학교 의과대학 지역사회의학연구소 1992 충남의대잡지 Vol.19 No.2

The differences of the liver scintigraphic features between postnecrotic and nonpostnecrotic liver cirrhosis were studied for 69 patients. Degrees of mottling and splenomegaly were no different between two groups but shrinked form was more frequent finding in postnecrotic type(23:10), and normal shape & enlarged left lobe with shrinked right lobe were relatively dominant in non-postnecrotic group(15:6, 10:2). Grade of extrahepatic uptake of ^99mTc-tin colloid was significantly higher in Child-Pugh B & C group than A group(p<0.05), but there was no difference between postnecrotic and non-postnecrotic groups. These will be important results on the dicision for the presence of cirrhosis according to the variable causes.

10주간의 체계적 운동이 노인들의 골밀도에 미치는 영향

이규문,최종환,김창범,김태헌 忠北大學校 平生體育硏究所 1997 平生體育硏究所 論文集 Vol.9 No.-

An experimental study was designed to investigate the effects of 10-weeks exercise on the bone mineral density (BMD) in women (ages 55 to 74). The subjects were placed into two age groups; middle aged group(n=19, 62.2±2.5 yrs) old group(n=16, 69±2.3 yrs). All subjects completed the bone mineral density test ( Radius and Ulna) by computed tomography both prior to and immediately following 12-weeks program. Both experimental groups participated in an 12-week exercise program consisting of three 80-min supervised exercise bouts a week. A pairs T-test was used to examine differences between pre-and post-test scores in the bone mineral density, depending on each age group. First the significant improvement (1.7%) appeared on BMD in all subjects together after 10-weeks exercise. Specifically, the middle aged group showed statistically significant increase(1.2%) between pre-and post-test scores in he bone mineral density after 10-weeks program. However, even though the improvement (2.2%) of BMD in the older group was not significant in statistics, the improvement(2.2%) of BMD in the older group is bigger than the improvement (1.2%) of BMD in the middle aged group. Therefore, the results suggest that improvements in BMD may be affected by acute exercise and may support the affective beneficence of exercise for older populations.

초음파현미경의 진폭과 위상 영상처리

연규헌,김현 경복대학 1998 京福論叢 Vol.2 No.-

본 연구에서는 시료에서 반사된 신호의 진폭과 위상을 동시에 검출할 수 있는 쿼드러춰 검출기를 사용한 초음파 현미경을 구성하고 표면결함이 존재하는 시료에 적용하여 결함에 대한 진폭과 위상영상을 획득하였으며 비선형 임계치 포스터라이징(Nonlinear Threshold Posterizing) 영상처리방법을 이용하여 산란과 회절에 의한 결함 영상의 질을 개선하였다. 실험을 위하여 시료로서 알루미늄을 사용하여 직경이 2mm인 원형결함이 존재하는 시편을 제작하였으며 영상범위는 50×50 픽셀이 되도록 하고 화소 간격은 200㎛가 되도록 하였다. 비선형 임계치 포스터라이징 처리를 위하여 획득한 영상데이터의 분석으로부터 3개의 임계치를 결정한 후 4개의 그룹으로 명도값 범위를 조정하여 영상처리 하였다. 영상처리결과, 비선형 임계치 포스터라이징 방법은 결함의 경계면에서 콘트라스트를 선형적인 맵핑방법에 비하여 상당히 개선하였으며 특히 위상 영상은 결함 경계면에서 산란과 회절에 의한 블러링 효과를 줄여 진폭영상보다 우수한 영상 화질을 나타내었다. In this study, the acoustic microscope has been constructed using the quadrature detedtor which can simultaneously detect the amplitude and phase of the reflected signal from the sample. The amplitude and phase images of the sample with surface defects have been acquired by the microscope. The scattering and diffration effects have degraded the quality of the images but it has been enhanced by using the nonlinear threshold poterizing processing. In this experiment, the sample has been created by making four circular defects with 2mm diameter on the aluminum surface. The image field of sample is 50×50 pixels and the distance between pixels is 200㎛. To the nonlinear threshold poterizing processing, the threshold values have been decided through the analysis of image data and the range of intensity images has been adjusted in four groups. It has been shown in the results of image processing that the contrast around the boundaries of defects are much more enhanced by the nonlinear threshold poterizing processing method than the linear mapping method, and especially the quality of phase image is better than the amplitude image by reducing the blurring effect around the boundaris.

차량경로문제(VRP)의 최적루트 설계를 위한 알고리듬 개발에 관한 연구

이규헌 한국경영과학회 1994 한국경영과학회지 Vol.19 No.1

This paper is concerned with the development of tree-search algorithm for the exact solution to the vehicle routing problem (VRP), where set of vehicles of known capacity based at depot, have to be routed in order to supply customers with known requirements. What is required is to design routes, so that the total cost (i. e. total route length or time duration, ect. ) is minimized. For obtaining the exact solution, the most important factors are the value of bound and branching strategy. Using the bound based on with bound ascent procedures from subgradient and state-space ascents, the incorporation of bounds into tree search algorithm to solve the problem is shown. Computational results of the corresponding algorithm show that VRPs with up to 40 customers can be solved optimally with this algorithm.

노년의 대퇴골 원위부 골절 시 동시에 시행한 전슬관절 성형술 및 금속판 내고정술 : 8예 보고 Report of Eight Cases

김동헌,장병춘,신규철,양준호 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-

Supracondylar fracture of the femur can be treated by a wide variety of methods. Although satisfactory results have been achieved with either open and closed treatment, less certain results are obtained for the elderly who have pre-existing osteoarthritis and osteoporosis. Particularly, elderly patients who have preexisting osteoarthritis are at increased risk of posttraumatic arthritis, stiff knee, persistent pain. Primary total knee arthroplasty(TKA) might obviate many of these potential problems and help to return the high-risk patient to an ambulatory functional status immediately. There are few reports about this study. The purpose of this study is to evaluate the results treated by simultaneous internal fixation and TKA for the supracondylar fracture in the elderly who have osteoarthritis of the knee joint. From 1994 to 1998, eight primary TKAs using posterior cruciate sparing PFC knee(Press Fit Condylar, Johnson & Johnson, Raynham, U.S.A) were performed after internal fixation for the supracondylar fracture of the femur with Judet plate or condylar buttress plate by conventional means. Patella was not resurfaced in all knees. According to the M ller classification of the supracondylar fracture of the femur 5 fractures were type A, 2 in type B, 1 in type C. Five patients were female, 3 patients were male. The ages ranged from 66 to 81, with an average of 74 years. Patients were followed for at least 1 year(average 3 years). The mean interval between the injury and operation was 2 weeks(range, 1 week to 4 weeks). Active knee joint exercise was encouraged in a hinge brace under the postoperative pain control. Partial weight bearing was permitted at the postoperative 4 to 6 weeks using crutches. Full weight bearing was allowed after union of the fracture. Fractures were united in all patients and the average duration of bony union was 16 weeks. The average amount of flexion and average flexion contracture for the all patients at the most recent follow-up were 96 degrees (range, 45 to 120 degrees) and 7 degrees (range, zero to 20 degrees), respectively. Using the knee rating score advocated by the American Knee Society, the average postoperative score was 87 for pain and 80 for function. We concluded that simultaneous internal fixation and TKA for supracondylar fracture of the femur in elderly patients who have advanced knee osteoarthritis may provide satisfactory pain relief and function with acceptable morbidity.

무선 환경에서 안전한 종단간 보안을 제공하는 AWTLS(Alternative Wireless Transport Layer Security) 프로토콜 : AWTLS(Alternative Wireless Transport Layer Security) Protocol

최진규,이헌길 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

The WAP is a set of protocols that optimizes standard TCP/IP protocols, for use under the low bandwidth, high latency conditions often found in wireless networks. In WAP, WTLS(Wireless Transport Layer Security) is a subprotocol that it has been suggested for security communications. This protocol is a modified version of the TLS(Transport Layer Security) appropriate for wireless networks. In the data exchange between WTLS and TLS protocol, the message transmitted between the handset and the server is unencrypted for a very brief moment inside the WAP gateway. Even though the interval time the message remains unencrypted is very short, he or she who has an administrator account can attempt to view the unencrypted message. Therefore, in this paper, we propose the safe end-to-end security model, which is called AWTLS(Alternative Wireless Transport Layer Security). The proposed AWTLS can not only prevent the gateway from viewing the uncrypted message, but also reduce the encryption/decryption overhead of the mobile terminal.