디젤燃料로서 混合油를 사용할 경우의 小型디젤 機關 性能에 관한 硏究

고태규,고장권 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1

This Paper is concerned with the usuability of the blend oil(diesel oil:rape-seed oil=50 : 50. capacity rate) as a fuel oil to reduce the usage of petroleum. Physical and chemical properties of blend oil as fuel oil are studied and analyzed experimentally. Engine performance from 900rpm to 1.900rpm is tested by operating small diesel engine(Ricardo E.6 engine) injected blend oil and also the effects on the engine performance are investigated. The experimental results are summarized as follows : 1. The lower heating value of blend oil is 10.130kcal/kg and flash point is 92℃. The values are different from diesel oil by 4.4% and 6.6%, respectively. 2. The viscosity of blend oil is 15.73 cSt. This value is 4.5 times larger than the value of diesel oil viscosity. but is 3.2 times smaller than the value of rape-seed oil viscosity. 3. P-θ diagram shows that the maximum explosion pressure of blend is 2∼4kg/㎠ higher than that of diesel oil. 4. Brake horse power, specific fuel consumption and exhaust temperature of blend oil are 7.5%, 3.5% and 3.9% higher than those of diesel oil, respectively. The brake thermal efficiency and noise are all most the same level compare to diesel oil. 5. Torque of blend oil is about 3.4% lower than that of diesel oil.

저지대 홍수피해 저감을 위한 도시계획기법 연구

고태규(Tae-Gyu Koh),이원영(Won-Young Lee) 서울연구원 2012 서울도시연구 Vol.13 No.4

Hydrogen Diffusion in APX X65 Grade Linepipe Steels

( Gyu Tae Park ),( Seong Ung Koh ),( Kyoo Young Kim ),( Hwan Gyo Jung ) 한국부식방식학회 2006 Corrosion Science and Technology Vol.5 No.4

A Comparison in Characteristics of Chemical Composition of Glass Vessels Excavated from Neungsalli Temple in Buyeo, Korea, from Baekje Period

Koh, Min Jeong,Kang, Hyung Tae,Kim, Na Young,Kim, Gyu Ho Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.12

From Neungsalli Temple located in Buyeo, ancient glass vessel fragments were discovered along with hundreds of glass beads. In this research, we used SEM-EDS to analyze glass vessel fragments and beads excavated from Neungsalli Temple. Then, we analyzed their chemical composition and examined their characteristics. In particular, we investigated a relationship between glass vessels from Neungsalli temple and Hwangnamdaechong (South tomb). The result of our experiment showed that the glass artifacts from Neungsalli temple were all soda glass. To be specific, the vessel fragments were soda-lime glass and spherical beads were high-alumina soda glass. Then, we compared glass vessel fragments from Neungsalli temple to glass vessels excavated from Hwangnamdaechong. Glass vessels from both sites turned out to be soda lime glass. We classified them further based on raw material used for soda - natron and marine plant ash.

임신과 동반된 자궁부속기 염전 1례

고민환,이태형,전경숙,이은지,이봉규,황광영 영남대학교 의과대학 1999 Yeungnam University Journal of Medicine Vol.16 No.1

저자들은 영남대학교 의과대학 부속병원 산부인과에서 임신과 동반된 자궁부속기 염전 1례를 경험하였기에 간단한 문헌적 고찰과 함께 보고하는 바이다. Adnexal torsion is not a common surgical emergency in obstetrics and gynecology, and is not observed frequently during pregnancy with its incidence being one out of about 5,000 pregnancies: pregnancy is a factor that encourages torsion. The traditional treatment for ischemic and twisted adnexa consists of oophorectomy or salpingo-oophorectomy. With early diagnosis, a conservative approach is recommended in cases of young women to assure future fertility. With a brief review of literature, we report a case of unilateral salphingo-oophorectomy during pregnancy due to adnexal torsion with the delivery of a normal baby.

간세포암에 의한 뼈전이의 방사선치료

김태규(Tae Gyu Kim),박희철(Hee Chul Park),임도훈(Do Hoon Lim),김철진(Cheol Jin Kim),이혜빈(Hye Bin Lee),곽금연(Keum Yeon Kwak),최문석(Moon Seok Choi),이준혁(Joon Hyoek Lee),고광철(Kwang Cheol Koh),백승운(Seung Woon Paik),유병철(Byung 대한방사선종양학회 2011 Radiation Oncology Journal Vol.29 No.2

목적: 간세포암에 의한 뼈전이 환자의 방사선 조사선량에 따른 통증 감소 정도 및 전이성 병소의 영상학적 치료 반응을 분석하고 고선량 방사선치료가 도움이 될 수 있는지 알아보고자 하였다. 대상 및 방법: 2007년 1월부터 2010년 6월까지 병리 혹은 임상적으로 간세포암에 의한 뼈전이로 진단받고 증상 완화 목적의 방사선치료를 받은 103명에서 뼈전이 병소 223개 부위를 대상으로 연구하였다. 조사받은 생물학적 유효선량이 39 Gy10 이하인 경우 저선량군, 39 Gy10를 초과하는 경우 고선량군으로 대상환자를 구분하였다. 통증 감소 정도는 숫자통증등급(numeric rating scale)을 이용하였고 통증이 감소한 경우, 통증 정도에 변화가 없는 경우, 통증이 증가한 경우로 나누었다. 영상학적 반응은 modified Response Evaluation Criteria In Solid Tumors (RECIST) 기준을 이용하였으며 환자의 생존율에 영향을 미치는 인자를 분석하였다. 결과: 중앙추적관찰기간은 6개월이었다(범위, 0∼46개월). 저선량군에서는 67개 병소(66.3%) 부위에서, 고선량군에서는 44개 병소(89.8%) 부위에서 영상학적 반응이 있었다. 저선량군과 고선량군 사이에 영상학적 치료 반응 정도는 유의하게 차이를 보였다(p=0.02). 저선량군과 고선량군은 각각 65%와 75%의 통증 감소를 보였으나 통계적으로 유의한 차이는 없었다(p=0.24). 저선량군과 고선량군 사이에 급성 및 만성 치료 독성은 통계적으로 유의한 차이가 없었다(p>0.05). 뼈전이 진단 시부터 사망까지 생존기간은 0∼46개월(중앙값, 11개월) 범위였고 1년 생존율은 41.6%였다. 잔존 간 기능(Child-Pugh 점수)이 생존율에 유의한 영향을 미치는 인자였고 Child-Pugh 점수에 따른 중앙생존기간은 A 14개월, B와 C는 2개월로 나타났다. 결론: 간세포암에 의한 뼈전이는 고선량군에서 영상학적 반응 정도가 더 높았다. 잔존 간 기능이 좋은 환자에게 고선량의 방사선치료 시 높은 치료 반응을 얻음으로써 삶의 질의 향상에 도움을 줄 수 있음을 알 수 있었다. Purpose: To evaluate the extent of pain response and objective response to palliative radiotherapy (RT) for bone metastases from hepatocellular carcinoma according to RT dose. Materials and Methods: From January 2007 to June 2010, palliative RT was conducted for 103 patients (223 sites) with bone metastases from hepatocellular carcinoma. Treatment sites were divided into the high RT dose and low RT dose groups by biologically effective dose (BED) of 39 Gy10. Pain responses were evaluated using the numeric rating scale. Pain scores before and after RT were compared and categorized into ‘Decreased’, ‘No change’ and ‘Increased’. Radiological objective responses were categorized into complete response, partial response, stable disease and progression using modified RECIST (Response Evaluation Criteria In Solid Tumors) criteria; the factors predicting patients’ survival were analyzed. Results: The median follow-up period was 6 months (range, 0 to 46 months), and the radiologic responses existed in 67 RT sites (66.3%) and 44 sites (89.8%) in the high and low RT dose group, respectively. A dose-response relationship was found in relation to RT dose (p=0.02). Pain responses were 75% and 65% in the high and low RT dose groups, respectively. However, no statistical difference in pain response was found between the two groups (p=0.24). There were no differences in the toxicity profiles between the high and low RT dose groups. Median survival from the time of bone metastases diagnosis was 11 months (range, 0 to 46 months). The Child-Pugh classification at the time of palliative RT was the only significant predictive factor for patient survival after RT. Median survival time was 14 months under Child-Pugh A and 2 months under Child-Pugh B and C. Conclusion: The rate of radiologic objective response was higher in the high RT dose group. Palliative RT with a high dose would provide an improvement in patient quality of life through enhanced tumor response, especially in patients with proper liver function.

의과대학 학생의 해부학 실습 시 포름알데히드의 노출이 호흡기 · 안구점막 및 피부계통의 주관적 자각 증상에 미치는 영향

정태종(Tae-Jong Jeong),박규현(Gyu-Hyeon Park),허정(Jeong Hur),고상백(Sang-Baek Koh),박명배(Myung-Bae Park),장세진(Sei-Jin Chang) 대한체질인류학회 2018 해부·생물인류학 (Anat Biol Anthropol) Vol.31 No.1

이 연구는 해부학 실습 시 시신 고정을 위해 이용되는 포름알데히드 등의 화학약품에의 노출이 의과대학생이 주관적으로 느끼는 불편함과 호흡기 점막 및 안구 점막 관련 증상, 피부 계통의 주관적 자각 증상에 미치는 영향을 분석하였다. 연구대상은 해부학 실습을 수강한 의학과, 의학전문대학원 1 · 2학년 학생으로 이들을 대상으로 웹설문조사를 실시하였다. 총 14개교 학생 대표들을 통해 설문조사를 홍보하였으며, 이 중 설문 응답에 동의한 총 463명의 자료를 최종 분석하였다. 분석결과, 해부학 실습 시 중등도 이상의 불편함을 느꼈다고 응답한 대상자는 261명(56.4%)이었다. 실습 이후 알레르기성 비염, 안구 건조증 등의 기존 질환 악화가 있었다고 응답한 대상자는 104명 (43.2%)이었으며, 기존 질환의 과거력이 없었던 학생 중 증상이 새롭게 발현한 대상자는 209명(95.0%)이었다. 기존 질환의 악화에 영향을 미치는 요인을 다중로지스틱 회귀분석을 실시한 결과, 호흡기 · 점막의 경우 남자에 비해 여자 (OR: 2.000, 95% CI: 1.169~3.421)일 때, 주관적 불편감을 느낄수록 (OR: 3.190, 95% CI: 1.807~5.632) 위험도가 높았다. 피부계통의 경우, 연령이 높을수록 (OR: 2.612, 95% CI: 1.187~5.750), 보호 장비 착용 금지 (OR: 2.217, 1.006~4.885)일 때 유의하게 높았다. 새로운 증상 유발에 영향을 미치는 요인의 경우, 호흡기 · 점막은 주관적 불편감을 느낄수록 (OR: 5.097, 95% CI: 1.075~24.160), 피부계통의 경우 여자 (OR: 1.711, 1.090~2.686)일 때, 주관적 불편감을 느낄수록 (OR: 1.921, 95% CI: 1.218~3.031), 보호 장비 미착용 (OR: 1.953, 1.189~3.210)일 때 유의하게 높았다. 이 연구를 통해 우리나라 의과대학생들은 해부학 실습 시 포름알데히드 등의 화학약품의 노출 위험을 최소화 할 수 있는 장비를 제대로 착용하고 있지 못하며, 실습 시 각종 화학약품에의 노출로 인해 주관적 불편감 및 관련 질환을 경험하고 있음을 확인하였다. 해부학 실습에 대한 안전 가이드라인을 강화하고 학생 건강권을 보호할 수 있는 제도적 장치가 마련되어야 한다. This study aims to determine the effects of formaldehyde exposure on self-reported symptoms of respiratory-eye mucosa and integumentary system during anatomy practices among Korean medical students. Data were collected using the web-based survey. Study subjects in 1st and 2nd grade medical student, and having anatomy dissection in medical college and medical graduate school. A total of 463 students from the 14 medical college and medical graduate school participated in this study. The results show that 261 (56.4%) of the participants responded feeling discomfort above moderate at anatomy dissection. After anatomy dissection, 104 (43.2%) students responded aggravating the symptom allergic rhinitis, xerophthalmia and so on. 209 (95.0%) of them responded the new symptom’s appearance. In the result of multiple logistic regression, women (OR: 2.000, 95% CI: 1.169~3.421) and the students with feeling discomfort (OR: 3.190, 95% CI: 1.807~5.632) were more likely to increase the risk of pre-existing respiratory · eye mucosal system symptom’s aggravation than the counter parts. For pre-existing integumentary system symptom’s aggravation, risk is significantly higher in elder age group (OR: 2.612, 95% CI: 1.187~5.750) and with disapproval protective equipments (OR: 2.217, 1.006~4.885). In case of new symptom’s appearance, people with feeling discomfort above moderate (OR: 5.097, 95% CI: 1.075~24.160) in respiratory · eye mucosal system were more likely to increase the risk of new symptom’s appearance. And for integumentary system, risk was higher in people with feeling discomfort (OR: 1.921, 95% CI: 1.218~3.031), in woman (OR: 1.711, 1.090~2.686) and without enough protective equipments preparation (OR: 1.953, 1.189~3.210). This study confirms the protective equipments for minimizing exposure from chemicals for cytological fixation (e,g formaldehyde) is not worn enough and students in anatomy dissection experience discomfort and disease after anatomy dissection. Therefore, this study indicates that the safe guideline in anatomy dissection should be enhanced and institutional strategy to protect student’s right of health should be provided.

초음파 배열 시스템 기반의 CNN을 활용한 손짓 인식 정확도 향상

박규태(Gyu-Tae Park),주재우(Jae-Woo Joo),고진환(JinHwan Koh) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

The aim of this paper is to develop a device that provides high accuracy in the field of hand gesture recognition by utilizing ultrasound transducer arrays and CNN (Convolutional Neural Network) technology. Ultrasound technology has been continuously researched in the past, and its advantages such as high resolution and low cost make it highly applicable in the field of hand gesture recognition. Additionally, CNN has shown high performance in the field of image processing, enabling the creation of a model that analyzes and classifies hand gesture data. In this study, these technologies were combined to improve the accuracy of hand gesture recognition. Five sign language gesture data were collected using an 7x1 ultrasound transducer array system, and the accuracy was improved by inputting the preprocessed training data into CNN. The proposed model achieved an accuracy of approximately 91%.

A case of refractory uremic pleuritis successfully treated with corticosteroid

( Jun Gyu Song ),( Sae Han Kang ),( Byung Wook Jung ),( Byung Woo Yoon ),( Yong Geon Song ),( Chang Kyun Lee ),( Tae Yeon Lee ),( Young Min Koh ),( Hyeon Sik Oh ),( Seung Hyeun Lee ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1

Uremic pleuritis is a fibrous pleuritis of unknown pathogenesis in patients with end stage renal disease. Although uremic pleuritis generally responds to regular hemodialysis, cases that are refractory to dialysis or repeated thoracentesis have been reported. Treatment of refractory uremic pleuritis has not been established yet. We report a case of refractory uremic pleuritis which showed marked improvement following corticosteroid therapy. A 53-year-old man who had been on hemodialysis therapy for chronic kidney disease for 5 years was admitted to our hospital presenting with right side pleural effusion and dyspnea. Pleural fluid was straw-colored and exudate in nature. Cytologic examination, microbiologic test for bacteria, fugi, tuberculosis and adenosine deaminase assay had negative results. A pleural biopsy revealed chronic inflammation with fibrosis without any evidence of tuberculosis or malignancy. The pleural effusion did not respond to repeated thoracentesis and continuance of hemodialysis. With a diagnosis of refractory uremic pleuritis, we started prednisone 30 mg per day and tapered it out in 2 months. The pleural effusion responded to the treatment and completely resolved without complication.

Composite Measures of Supercomputer Technology

( Nam-gyu Kim ),( Noo Ri On ),( Myoung-ju Koh ),( Jongsuk Ruth Lee ),( Keun-tae Cho ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.8

We have developed composite measures of supercomputer technology, reflecting various factors of supercomputers using Martino’s scoring model. CPUs, accelerators, memory, interconnection networks, and power consumption are chosen as factors of the model. The weight values of the factors are derived based on a survey of 129 domestic and international experts. The measured values are then standardized to integrate measurement units of the factors in the model. This model has been applied to 50 supercomputers, and rank correlation analysis was performed using representative measures. As a consequence, the ranking drastically changes except for the 1st and 2nd supercomputers on the TOP500. In addition, the characteristics of memory and interconnection networks influence the ranking, and the results demonstrate that the proposed model has low correlations with HPL and HPCG but a high correlation with Green500. This indicates that power consumption is an important factor that has a significant effect on the measures of supercomputer technology. In addition, it is determined that the differences between the HPL ranking and the proposed model ranking are influenced by power consumption, CPU theoretical peak performance, and main memory bandwidth in order of significance. In conclusion, the composite measures proposed in this study are more suitable for comprehensively describing supercomputer technology than existing performance measures. The findings of this study are expected to support decision making related to management and policy in the procurement and operation of supercomputers.