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전재한,김선일,이두수,Jeon, Jae-Han,Kim, Seon-Il,Lee, Du-Su 대한의용생체공학회 1993 의공학회지 Vol.14 No.3
In the early stage of sacroilitis, it is'difficult to detect sacroiliac(Sl) abnormalities by conventional plain X-ray even though there are characteristic symptoms of ankylosing spondylitis. 3 dimensional volume rendering from the CT image was performed to make an early de tection of the structural changes of Sl joint. 2 cases who had clinical impression of ankylosing spondylitis without sacroilitis in plane X-ray and 1 case of typical ankylosing spondylitis as well as 1 case of normal control were studied. The Sl Joints were separated and each joint surface of sacrum and ilium was independently reconstructed by a special 3D manipulation program. All 2 patiant who complained of inflammatory lower back pain with no abnormal findings in the plain X-ray showed structural changes in 3 dimensionally reconstructed surface Image of the Sl joint compared to the normal control. Authors tried several parameters, such as fourler analysis of each surface and the mean and variance of Sl joint gap. We couldn't tell the statistical significance because of the limited number of cases. However, the parameters showed difference according to the progression of disease.
전재한(Jeon Jae Han),권재현(Kwon Jay Hyoun),양효진(Yang Hyo Jin) 대한공간정보학회 2007 대한공간정보학회지 Vol.15 No.1
현대사회는 지능적으로 고도화 되는 범죄에 대응하기 위하여 범죄 현상을 분석하려는 노력이 다각적으로 행해지고 있다. 컴퓨팅 기술과 GIS 기술을 이용한 범죄의 공간적 특성을 분석하려는 연구는 범죄 분야에서 최근 관심을 가지는 부분이다. 본 연구에서는 다양한 공간적인 특성이 나타나는 지역을 선정하여 범죄분포의 특성을 밝혀보고자 한다. 범죄는 발생 빈도가 높은 폭력, 절도 강도, 성폭행의 범죄에 대해서 재구성하였으며 변수 도출을 위한 이론적 배경은 생활양식-일상이론과 환경범죄학을 기초로 하였다. 분석 기법으로는 Hot spot 기법을 이용하여 범죄의 분포 형태를 분석하였으며 버퍼 분석을 하여 범죄 요인과 범죄 사이의 상관관계를 도출하였다. 분석된 자료를 통하여 최종적인 범죄 지도를 작성하였으며 이를 통하여 범죄율이 높은 지역을 공간적으로 선정할 수 있으므로 범죄의 예방에 효율적으로 활용될 수 있을 것이라 판단된다. To deal with the modem intellectual criminal acts, various efforts have been tried. Especially, it is not difficult to watch the recent activities to analyze the criminal characteristics spatially using computing and GIS technology. In this study, the spatial features and patterns of crime are investigated. Based on the real criminal record in Seoul Korea, the crime is reconstituted with four major categories such as assault, larceny, robbery, and rape. Then the variables are derived based on the theory of criminology. The kernal density analysis is performed to investigate the criminal distribution, and the correlation between the main criminal causes and the criminal outbreak is examined by buffering analysis. In addition, the land price and land usages are correlated with social-economic factors of criminal patterns to produce the final crime map.
두 개의 시간 영역 모델을 이용한 패킷 네트워크에서의 전송률 조절과 스케줄링
전재한(Jae-Han Jeon),임종태(Jong-Tae Lim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
In this paper, we propose the rate control and scheduling scheme for the packet network using the two-time scale model. Since the rate is controlled slowly compared to the scheduling at the bottleneck queue, the two-time model is adopted and analyzed. Then, with the approximation model, we present the stability condition and show that the steady state converges to the desired point. Finally, we confirm that the proposed scheme satisfies the desired performance by simulation results.
전재식,김은숙,유승성,오석률,최한영,Jeon, Jae-Sik,Kim, Eun-Sook,Yoo, Seung-Sung,Oh, Seok-Ryul,Choi, Han-Young 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.5
Objective: This study was carried out for the purpose of identifying major substances contributing to the production of odor and evaluating the characteristic of odors. Methods: Complex odor and 17 odorous compounds were measured at 18 waste transfer stations located in Seoul. Results: The dilution ratio value of complex odor ranged from 4 to 30 times in the boundary layer of 18 waste transfer stations. At 6 measurement points among the 18 waste transfer stations, the dilution ratio values exceeded standards (15 times). When the results were evaluated in terms of their contribution to the formation of malodor, the patterns indicated that the highest concentration values in the residential waste disposal process were of i-valeraldehyde and acetaldehyde, while butyraldehyde and acetaldehyde accounted for a large proportion of odorous compounds from the waste recycling process. Conclusions: It was found that butyraldehyde and acetaldehyde were the primary compounds released from the food waste disposal process. Overall, aldehyde compounds were the greatest contributor to detectable odor intensity emitted at the waste transfer stations.
내분비-대사 : 고칼슘혈증 동반 사르코이드증에서 정상 혈중 비타민 D를 보인 증례
전재한 ( Jae Han Jeon ),서정범 ( Jung Bum Seo ),황인량 ( In Ryang Hwang ),박혜윤 ( Hye Yoon Park ),김정식 ( Jeong Shik Kim ),박근규 ( Keun Gyu Park ),김정국 ( Jung Guk Kim ) 대한내과학회 2015 대한내과학회지 Vol.88 No.2
Diagnosing hypercalcemia is often challenging because a wide spectrum of diseases-such as malignancy, granulomatous disease, and primary hyperparathyroidism-should be considered. Sarcoidosis is a rare cause of hypercalcemia. The case of a 77-year-old male presenting with sarcoidosis-associated hypercalcemia whose serum 1,25(OH)2D level was normal is reported here. Despite a normal 1,25(OH)2D level and minimally enlarged hilar lymphadenopathy, the serum angiotensin-converting enzyme (ACE) level was increased. Mediastinoscopic biopsy of the right lower paratracheal lymph node revealed pathological findings compatible with sarcoidosis. Treatment with 30 mg/day oral prednisone was started. Currently, the patient is being treated with a tapered dose of oral prednisone and small doses of vitamin D and calcium. Despite its low incidence, sarcoidosis should be considered a cause of hypercalcemia. The important diagnostic factors are not only serum calcitriol levels but also serum ACE levels and pathological findings. (Korean J Med 2015;88:207-211)
폐경 후 제2형 당뇨병환자에서 대퇴골 골밀도와 혈중 렙틴 농도와의 연관성
전재한 ( Jae Han Jeon ),최연경 ( Yeun Kyung Choi ),서현애 ( Hyun Ae Seo ),이정은 ( Jung Eun Lee ),정지윤 ( Ji Yun Jeong ),문성수 ( Seong Su Moon ),이주영 ( Ju Young Lee ),김정국 ( Jung Guk Kim ),김보완 ( Bo Wan Kim ),이인규 ( In K 대한당뇨병학회 2009 Diabetes and Metabolism Journal Vol.33 No.5
연구배경: 인체에서 렙틴 농도와 골밀도는 체지방량과 양의 연관성이 있음이 밝혀져 있다. 반면, 렙틴과 골밀도 사이의 관계는 특히 제2형 당뇨병환자를 대상으로 한 연구에서는 그 결과들이 서로 일치하지 않고 있다. 이에, 폐경 후 당뇨병환자를 대상으로 렙틴과 골밀도의 관계를 알아보고자 하였다. 방법: 2008년 1월부터 제2형 당뇨병으로 진단받은 60명의 폐경 후 여성을 대상으로 DXA를 이용하여 요추(L1-L4)와 대퇴 근위부의 골밀도를 측정하였으며, 당화혈색소, 렙틴, 일회뇨에서의 알부민-크레아티닌 비(ACR)을 측정하였다. 결과: 나이와 체지방량 및 공복 인슐린 농도로 보정한 편상관 분석에서 혈중 렙틴 농도는 대퇴 경부(r=-0.308, P=0.020) 대퇴 전자(r=-0.303, P=0.025) 및 총 대퇴골(r=-0.290, P=0.032)의 골밀도와 음의 상관관계를 보였다. 다중 선형 분석에서도 대퇴골의 각 부위는 혈중 렙틴 농도와 유의한 음의 관련성을 보여주었다. 결론: 폐경 후 제2형 당뇨병 여성에서 대퇴골 골밀도가 혈중 렙틴 농도와 음의 상관성을 보일 수 있음을 본 연구에서 확인하였다. 현재까지의 연구들이 서로 일치하지 않는 결과들을 보이고 있어 보다 많은 환자들을 대상으로 한 추가적인 연구가 필요할 것으로 생각된다. Background: Serum leptin level and bone mineral density (BMD) are widely assumed to be positively associated with body fat mass. Numerous attempts have been made to document the relationship between leptin and BMD, but the results are inconsistent, especially in diabetic patients. Methods: A total of 60 Korean postmenopausal women with type 2 diabetes mellitus were included in the present study. The BMDs of lumbar spines (L1 to L4) and proximal femurs (trochanter, neck, and total) were measured by dual-energy X-ray absorptiometry (DXA), and biochemical markers including leptin, HbA1c, C-peptide and urine albumin-creatinine ratio (ACR) were measured for each patient. Results: Negative associations between leptin and BMD of femoral neck, trochanter, and total femur in postmenopausal women with type 2 diabetes mellitus were documented in a model adjusted for age, body fat mass, and fasting insulin level (r=-0.308, P=0.020 and r=-0.303, P=0.025 and r=-0.290, P=0.032 respectively). Multiple linear regression analysis was performed revealing negative associations between leptin and BMD of the femoral neck (β=-0.369), trochanter (β=-0.324), and total femur (β=-0.317). Conclusion: The results of the present study suggest a negative relationship between leptin and femoral BMD. In addition, leptin may have a negative effect on BMD in postmenopausal women with type 2 diabetes mellitus. (Korean Diabetes J 33:421-431, 2009)