토끼의 일측 신동맥 결찰수 발생된 신경색에 있어서 확산강조영사의 유용성에 관한 연구

이준우,김석,김용우,허진삼,최상열,문태용,이석홍,김병수,이창훈,Lee, Jun-Woo,Kim, Suck,Kim, Yong-Woo,Hu, Jin-Sam,Choi, Sang-Yoel,Moon, Tae-Yong,Lee, Suck-Hong,Kim, Byung-Su,Lee, Chang-Hun 대한영상의학회 1998 대한영상의학회지 Vol.38 No.2

Purpose : To assess the usefulness of diffusion-weighted imaging(DWI) in evaluating serial parenchymal changesin renal infarction induced by renal artery ligation, by comparing this with the conventional spin echo techniqueand correlating the results with the histopathological findings. Materials and Methods : In 22 rabbits, renalinfarction was induced by ligation of the renal artery. Spin-echo T1-weighted imaging(T1WI), turbo spin-echo(TSE)T2-weighted imaging(T2WI), and DWI were performed, using a 1.5-T superconductive unit, at 30 minutes, 1 hour, 2,3, 6, 12 and 24 hours, and 2, 3, 7 and 20 days after left renal artery ligation. Changes in signal intensity onT1WI, T2WI, and DWI were correlated with histopathologic findings. Results : On MR images obtained 30 minutesafter ligation, the signal intensity of affected kidney was not significantly different from that of contralateralkidney, as seen on T1WI and T2WI, but was noticeably higher on DWI. On T2WI, the signal intensity ratio(SIR) wasslightly higher over time from 30 minutes to 2 days after ligation, and then decreased slightly. The SIR on DWIincreased abruptly at 30 minutes, remained high until 12 hours, and then fell, returning to close to the normalrange at between 2 and 3 days. It fell further, below the normal range, until 20 days after ligation. The mainhistopathologic findings after ligation were congestion and swelling of renal tubules (1-6 hours after ligation),degeneration and necrosis of renal tubules (12 hours - 2 days), coagulation necrosis of renal tubules(3 days),collection of cellular debris between renal tubules (7 days), and proliferation of fibroblast between renaltubules (20 days). Conclusion : Diffusion-weighted imaging is useful for the detection of hyperacute renalinfarction, and the apparent diffusion coefficient may provide additional information concerning its evolution.

소아의 제 2 새궁 기형의 임상적 고찰

이준우,김수홍,김현영,박귀원,정성은,Lee, Jun-Woo,Kim, Soo-Hong,Kim, Hyun-Young,Park, Kwi-Won,Jung, Sung-Eun 대한소아외과학회 2011 소아외과 Vol.17 No.2

Branchial cleft anomalies are the second most common head and neck congenital lesions seen in children. Amongst the branchial cleft malformations, second cleft lesions account for 95 % of the branchial anomalies. This article analyzes all the cases of second branchial cleft anomalies operated on at Seoul National University Hospital from September 1995 to February 2011. We analyzed sex, age, symptom and sign, accompanied anomaly, diagnosis, treatment, pathologic report and outcome via retrospective review of medical records. In this series, we had 61 patients (27 female and 34 male). The mean age at the time of operation was 38 months. 31 lesions were on the right, 20 were on the left and 10 were bilateral. The most frequent chief complaints at presentation were non-tender mass and cervical opening without any discharge. According to anatomic type, 29 patients had branchial cleft sinuses, 14 had cysts, 14 had fistulas and 4 had skin tags. Complete excision was attempted if possible and antibiotics challenged when infection was suspected. Complete excision was achieved in 96.7 % of cases. Incision and drainage was done in 2 cases due to severe inflammation, and both recurred. Postoperative complications included wound infection in 2 cases. Microscopic examonation revealed squamous epithelium in 90.2 % and squamous metaplasia in one case in the branchial cleft cyst wall. In summary, second branchial anomaly is found more frequently on right side of neck. Fistulas are diagnosed earlier than cystic forms. Most cases could be diagnosed by physical examination. The definitive treatment is complete excision and sufficient antibiotics coverage for cases with inflammation. After drainage of infected lesions, follow up excision after 1 year might be beneficial for preventing recurrence.

보이스코일 액튜에이터를 기반으로 한 고정밀 직선이송 시스템의 위치결정

이준우,김병희,장인배,Lee, Jun-Woo,Kim, Byeong-Hee,Chang, In-Bae 강원대학교 산업기술연구소 1999 産業技術硏究 Vol.19 No.-

The voice coil actuator uses the Lorentz force between the magnetic field of the permanent magnets and the electromagnets to the motions and positioning. The small size, light weight and fast dynamic response of the these type actuators lead to admit them in the micro-positioning apparatus of the micro-machining systems. In this paper, the linear motion voice coil actuator is developed for the driving and positioning the rotating electrode of the electric discharge machine (EDM). The analyzed and measured results for the actuator are compared and discussed.

소아 환자에서 조직확장기 사용의 유용성

이준우,박철규,박종림,김용규,Lee, Jun-Woo,Park, Chul-Gyoo,Park, Jong-Lim,Kim, Yong-Kyu 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6

Purpose: Reconstruction of soft tissue defect using tissue expander can provide better flap which is more similar to surrounding tissue in color, skin texture and hair compared to other methods. Many pediatric patients need reconstruction of soft tissue defect because of giant congenital nevi, congenital or acquired malformations and burn scars. Reconstruction using tissue expander is adequate to minimize dysmorphism in these patients. We intended to assess outcomes of using tissue expander in pediatric patients by retrospective study. Methods: Total cases were 168 of pediatric patients who received soft tissue reconstruction using tissue expander by the same surgeon from February, 1982 to May, 2009. All patients who received soft tissue reconstruction were under 10 years old. Mean age was 4.3 years old, the youngest 13 months, the oldest 8 years. Eightynine cases were male and 79 cases were female. Most common cause was giant hairy nevi (67 cases, 39.9%), secondary cause was burn scar/scar contracture (61 cases, 36.3%). Trunk (38 cases, 22.6%) was most common anatomical location. Results: Soft tissue defects were successfully covered using tissue expander in 149 cases (88.7%) without major complications. There was infection on 8 cases (4.7%) and we treated by adequate antibiotics in these cases. There were tissue expander folding or valve displacement on 5 cases (3%). Conclusion: Usage of tissue expander is useful on pediatric patients because tissue expansion is rapid on children and there are less secondary contractures on operation site than full thickness skin graft. Because of psychological stress due to tissue expander, operation should be performed before school age.

리튬 이차전지용 텅스텐 산화물 전해 도금 박막 제조

이준우,최우성,신헌철,Lee, Jun-Woo,Choi, Woo-Sung,Shin, Heon-Cheol 한국재료학회 2013 한국재료학회지 Vol.23 No.12

Tungsten oxide films were prepared by an electrochemical deposition method for use as the anode in rechargeable lithium batteries. Continuous potentiostatic deposition of the film led to numerous cracks of the deposits while pulsed deposition significantly suppressed crack generation and film delamination. In particular, a crack-free dense tungsten oxide film with a thickness of ca. 210 nm was successfully created by pulsed deposition. The thickness of tungsten oxide was linearly proportional to deposition time. Compositional and structural analyses revealed that the as-prepared deposit was amorphous tungsten oxide and the heat treatment transformed it into crystalline triclinic tungsten oxide. Both the as-prepared and heat-treated samples reacted reversibly with lithium as the anode for rechargeable lithium batteries. Typical peaks for the conversion processes of tungsten oxides were observed in cyclic voltammograms, and the reversibility of the heat-treated sample exceeded that of the as-prepared one. Consistently, the cycling stability of the heat-treated sample proved to be much better than that of the as-prepared one in a galvanostatic charge/discharge experiment. These results demonstrate the feasibility of using electrolytic tungsten oxide films as the anode in rechargeable lithium batteries. However, further works are still needed to make a dense film with higher thickness and improved cycling stability for its practical use.

최인접 거리 비율 정합을 이용한 영상 특징점 선택 방법

이준우,정재협,강종욱,나상일,정동석,Lee, Jun-Woo,Jeong, Jea-Hyup,Kang, Jong-Wook,Na, Sang-Il,Jeong, Dong-Seok 대한전자공학회 2012 전자공학회논문지 Vol.50 No.8

본 논문에서는 현재 진행 중인 MPEG(Motion Picture Experts Group, ISO/IEC JTC1 SC29 WG11)의 표준화 작업 중 CDVS(Compact Descriptor for Visual Search)의 CE-7(Core Experiment)인 특징점 선택에 대한 방법을 제안한다. 서술자의 경량화를 위해서는 영상으로부터 추출된 많은 수의 특징점들 중에서 영상 정합에 사용될 중요한 특징점들을 선택해야 한다. 본 논문에서는 최 인접 거리 비율 정합(Nearest Neighbor distance ratio matching) 방법에 의해 영상 정합 단계에서 사용되지 않고 버려지는 특징점들을 미리 추출 단에서 제거하는 방법 제안하였다. 제안된 방법을 통하여 적은 비트 전송률을 요하는 시스템에서 특징점의 낭비를 피할 수 있고 결과적으로 추가적인 특징점을 사용할 수 있으므로 전체적인 성능 향상을 얻을 수 있었다. 제안된 알고리즘을 통하여 Pair-wise 정합 실험에서 기존의 Test Model 대비 최고 2.3%의 성공율(True positive rate)의 향상을 보였다. In this paper, we propose a feature point selection method for MPEG CDVS CE-7 which is processing on International Standard task. Among a large number of extracted feature points, more important feature points which is used in image matching should be selected for the compactness of image descriptor. The proposed method is that remove the feature point in the extraction phase which is filtered by nearest neighbor distance ratio matching in the matching phase. We can avoid the waste of the feature point and employ additional feature points by the proposed method. The experimental results show that our proposed method can obtain true positive rate improvement about 2.3% in pair-wise matching test compared with Test Model.

만성요통 환자에게 미치는 음악의 적용 효과

이준우,Lee, Jun-Woo 대한물리치료학회 2007 대한물리치료학회지 Vol.19 No.4

Purpose: We investigated the effects of music on pain, blood pressure, and pulse in patients with chronic back pain. We tried to find some change of satisfaction of treatment and a sense. Method: We recruited total 30 patients with chronic back pain, who had pain from lumbago for more than six months. Subjects received electrotherapy and electrotherapy with music one at a time during me test, and subjects received one in the morning and the other one in the afternoon. We compared the test results between the electrotherapy and electrotherapy with music. Visual Analogue Scale was used to check the effect on pain. Blood pressure and pulse were checked, too. The gathered informatio was analyzed by t-test, independent sample t-test, and chi-square test. Results: There was statistically not significant difference between electrotherapy and electrotherapy with the music in VAS(Visual Analogue Scale)(p>0.05). There were statistically some significant differences between two groups in systolic pressure, diastolic pressure, and the pulse(p<0.05). Subject group showed statistically higher scores of satisfaction(p<0.05). There was significant difference between two groups(p<0.05) in the tingling and vibration sense. Conclusion: we found that the lumbago patients who are treated by electrotherapy with the music did not have additional difference in relief of pain, but electrotherapy with music can get better effects on their blood pressure, the pulse, satisfaction, and tingling-vibration sense. This means that the patients receive their treatment comfortably with rest. Therefore, We consider that it is desirable to play music to lumbago patients to offer the better treatment service to the patients.

커피음용이 단기간 근육작용 활성화에 미치는 영향

이준우 ( Jun Woo Lee ),조강희 ( Gang Hee Cho ) 한국전문물리치료학회 2007 한국전문물리치료학회지 Vol.14 No.3

WMS HEC-1을 이용한 경안천 유역의 경년 수문변화 분석

이준우 ( Lee Jun Woo ),임혁진 ( Lim Hyuk Jin ),이미선 ( Lee Mi Sun ),김성준 ( Kim Seong Joon ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-

1. The purpose of this study is to evaluate the hydrologic impact due to temporal land cover changes of Gyueongan-cheon watershed. 2. WMS(Watershed Modeling System) HEC-1 was adopted and the required data such as DEM(Digital Elevation Model), stream network, soil map were prepared, and land cover map was made by using Landsat TM data. 3. Due to the increase of urban area and paddy field, the runoff ratio increased 5.8% during the past decade.

프로골퍼의 성별에 따른 심리상태의 구인동등성 검증 및 잠재평균분석

이준우(Jun Woo Lee) 한국체육측정평가학회 2011 한국체육측정평가학회지 Vol.13 No.2

프로골퍼의 심리상태를 확인하기 위해 현재 사용되는 일반적인 척도는 우찬명(2003)이 개발한 심리적기술 척도이다. 심리적기술 척도는 경기 전에 나타나는 불안, 다양한 상황에서 선수의 행동과 의식을 평가할 수 있는 도전의식, 다음 플레이에 대한 구체적 심상화 능력을 측정할 수 있는 심상조절, 선수의 행동이나 생각을 통한 자신감, 주의를 집중하는 능력, 위기상황을 극복할 수 있는 능력인 각성조절 등의 6가지 하위요인으로 구성되어 골퍼들이 다양한 심리적 요인들을 자율적으로 조절하여 최대의 경기력을 발휘할 수 있는 능력을 측정한다. 본 연구에서는 프로골퍼의 심리상태를 측정할 수 있는 심리적기술 척도가 남자와 여자에게 동일하게 사용될 수 있는지를 확인하기 위해, 또한 남자와 여자에 따라 심리적기술 척도의 차이가 존재하는지를 확인하기 위해 구조방정식 모형을 적용한 잠재평균분석을 실시하였다. 분석결과에 의하면, 6개 요인 구조가 프로골퍼의 성별에 공통적으로 사용될 수 있을 만큼 보편 타당한 문항으로 제작되었다는 결과를 얻었다. 또한 남자 프로골퍼는 자신감, 도전의식, 불안에서 여자에 비해 높게 지각하며 다른 요인들은 차이가 나지 않았다. 따라서 본 연구는 심리적기술 척도가 성별에 동일하게 사용될 수 있어 프로골퍼의 심리상태에 대한 발달과정을 연구할 수 있는 토대를 제공한다는 점에서 의의가 있으며, 성별에 따라 심리적기술에서 차이를 보인 것은 성별에 따라 심리기술 프로그램을 제시해야 그 효율성이 높다는 결론을 얻었다. Currently, criterion of psychological skill factors by Woo (2003) is used to check out the pro- golfer" mental state generally. Psychological skill factors consist of 6 subdivision(Pre-game anxiety, challenge being able to evaluate the player`s doing and sense in various situations, image training being able to measure the detailed imaging ability for next game, self-confidence from the player`s movement and thinking, concentrating one`s attention, and wake-control being able to deal with a crisis) measure the pro-golfer`s ability it makes the most of athletic performance by controlling the psychological factors voluntarily. The purpose of this study was verifying psychological skill factors to be usable as common to gender neutral, and verifying differences of each factor between genders by analyzing the latent means with construct equivalence verification. The study found psychological skill factors of comprising 6 questions was produced with reasonable questions; this is available to both genders in common. Also, male pro-golfer`s confidence, challenge, anxiety among psychological state elements was higher than female relatively, and another elements was not different between gender. In conclusion, first the common use of psychological skill factors to gender neutral is meaningful to supporting study for the golfer`s mental state`s progression. Second golf coaches are able to improve instructive efficiency for the golfers by presenting personal psychological skill program that included reasonable information of gender psychological state.