직선 절개와 Z-성형술을 이용한 Dupuytren 구축의 치료

안희찬,우상현,천호준,김경철 대한수부외과학회 2011 대한수부외과학회지 Vol.16 No.1

Purpose: To report the results of patients with a Dupuytren’s contracture treated with fasciectomy combined with straight line incision and multiple Z-plasty. Materials and Methods: We performed retrospective study on 33 hands in 28 patients who had a Dupuytren’s contracture between March 2006 to July 2009. Patients were males and the average age was 62-year-old ranging from 50to 75. There were 15 single and 18 multiple digits involvement. Operation involved fasciectomy using straight skin incision combined with multiple Z-plasty. Postoperative assessment was based on the Honner’s classification and range of motion of the involved fingers. Results: According to Honner’s classification, the clinical results were excellent in 19 cases, good in 11 and fair in 3. No complication was found except three patients who complained of pain for 6 months after the surgery. The mean range of motion of the involved fingers was 120˚ preoperatively and it increased to 205˚postoperatively. Cold intolerance lasted for about 6 months in 5 patients but improved spontaneously. Conclusion: In patients with a Dupuytren’s contracture, fasciectomy with a straight midline incision and multiple Zplasty provides satisfactory recovery of finger motions. 목적: Dupuytren 구축의 수술적 치료로 종적 직선 절개와 함께 여러 개의 Z-성형술을 사용하여 근막절제술을 시행한 환자들을 대상으로 임상 결과를 보고하고자 한다. 대상 및 재료: 2006년 3월부터 2009년 7월까지 Dupuytren 구축으로 수술을 받은환자 28명 33개 수부를 대상으로 하였다. 수술 후 수지의 운동 범위를 측정하였으며Honner의 방법에 따라 결과를 분류하였다. 결과: 평균 15개월 외래 추시에서 Honner의 평가 방법에 따른 평가는 우수가 19예,양호가 11예, 보통이 3예였다. 술 전 중수지 관절을 포함한 수지의 평균 운동 범위는120˚였으며 수술 후 평균 205˚의 능동 운동 범위를 보였다. 결론: Dupuytren 구축에 대한 수술적 치료로 종적 직선 절개와 여러 개의 Z-성형술을 이용한 근막 절제술은 만족스러운 수지 운동 범위의 호전을 기대할 수 있는 방법이다.

사업체 종사자들의 경찰신뢰도 연구 : 표현적 시각모형과 도구적 시각모형의 비교

안희찬,장현석 대한범죄학회 2019 한국범죄학 Vol.13 No.1

Studies on the confidence in the police have been conducted in many different dimensions. Various kinds of studies such as the comparative studies on confidence in the police among several different countries as well as immigrants’ confidence in the police have been done. However, it is hard to find confidence in the police study against people who work at the specific job. This study examined confidence in the police among commercial business owners who usually had higher level of crime victimizations. For this study, we used 2016 「Korean Crime Victim Survey(VI): Commercial Victimization Survey」 data. Using instrumental model and expressive model of confidence in the police, this study tried to find out which model explains better the confidence in the police among commercial business owners. Analysis results showed that overall expressive model explained the confidence in the police better than instrumental model among commercial business owners. Among the expressive model factors, community’s crime prevention level and community collaboration gave relatively greater influence on the confidence in the police. Interestingly, fear of crime victimization was significant variable as an instrumental model factor. Based on the analysis results, the policy implication was suggested. 경찰신뢰도에 관한 연구는 다양한 방면에서 진행되어 왔다. 국가비교연구 및 이민자들이 체감하는 경찰에 대한 신뢰도연구 등 다양한 수준의 연구들이 진행되어 왔지만 현재까지 특정직종을 대상으로 한 연구는 찾아보기 어렵다. 그러므로 본 연구에서는 범죄피해노출이 잦은 사업체 종사자들(사업주)을 대상으로 경찰신뢰도에 대한 연구를 진행하였다. 본 연구에서는 한국형사정책연구원에서 실시한 2016년 「전국 사업체 안전실태조사」데이터를사용하였다. 기존의 연구들에서 사용한 도구적 시각모형과 표현적 시각모형을 바탕으로 사업체종사자(사업주)의 경찰신뢰도에 있어 어떠한 모형이 설명력이 높은지 알아보았다. 다중회귀분석 결과, 기존의 연구와 일관되게 표현적 시각모형이 도구적 시각모형보다 설명력이 높은 것으로 나타났으며 표현적 시각모형 중에서 지역사회방범수준과 지역사회협력이 경찰신뢰도에 비교적 큰 영향을 준 것으로 나타났다. 흥미롭게도 도구적 시각모형에 있어서는 범죄두려움이 경찰신뢰도에 큰 영향을 준다는 것을 알 수 있었다. 이러한 결과를 바탕으로 사업체종사자들의 경찰신뢰도를 증진시키기 위한 정책적 함의를 제시하였다.

단기통 4행정 가솔린 기관의 연소압력 변동성에 관한 연구

안희찬(Hee-chan An),윤창식(Chang-sik Yoon),김치원(Chi-won Kim) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

In a spark ignition engine which has the combustion characteristics of a premixed homogeneous charge and flame propagation, maximum cylinder pressure equal to heat release per cycle during burned period depend upon the rate of heat release and volume change according to piston motion. currently, analysis observes that pressure development for a number of consecutive cycles of an engine operating at steady state reveals a dispersion, and describes, fundamentally, the cause and effect of combustion. the view taken in this study is that analysis process and mode suggests and develops from that past paper is consist of complex analysis. as crank angle base, pressure data in cylinder of 51 engine have acquired and statistically analyzed in order to quantify the behavior of combustion and performance characteristics with engine variables.<br/> summarizing the result of this research is as follows:<br/> 1. The combustion variation was chosen as some variables: maximum cylinder pressure and heat release, its timing of occurrence to peak valve, ignition delay, combustion duration, and combustion rate(Y10%, Y50%, Y90%)<br/> 2. As the degree of mean and standard deviation of all factor according to cycle variation, it is known that combustion becomes unstable as leaner as mixture ratio becomes.<br/> 3. The magnitude and correlation of each analysis factors depend strongly upon air-fuel ratio and spark timing.

Flipped Voltage Follower 구조를 이용한 빠른 과도응답 특성을 갖는 LDO

안희찬(Heechan Ahn),노정진(Jeongjin Roh) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

Flow Forming Characteristics of AZ & AM system Magnesium Alloy Road Wheel

H. C. Ahn(안희찬),G. H. Yoon(윤건혁),J. J. Lee(이종주),J. H. Kim(김정호),H. S. Yoon(윤형석) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5

전골간신경 증후군의 운명

유명재,안희찬,서재성,우상현 대한수부외과학회 2017 대한수부외과학회지 Vol.22 No.1

Purpose: We report the causes and prognosis of anterior interosseous nerve syndrome (AIN) according to the treatment. Methods: From March 2009 to December 2015, the 20 patients with the clinical symptom of AIN syndrome were enrolled in the study and electromyography (EMG) of AIN was performed. We retrospectively reviewed hand function test, active range of motion, the disabilities of the arm, shoulder and hand (DASH) score and EMG during the recovery from disease. We further surveyed the time of recovery and residual symptoms. Results: The patients with unknown cause of the disease (12 cases), heavy work or trauma (6 cases) and infection (2 cases) were investigated in the study. Thirteen out of 15 cases with conservative treatment and 2 out of 5 cases with a surgical treatment at an average of 8 months from disease were recovered. In addition, 8 cases with fine motor disturbance and 3 cases with tingling residual symptom were observed. Conclusion: Due to the low possibility of entrapment neuropathy, conservative treatment for 7 months is the first choice rather than surgical treatment. If there is no improvement from the conservative treatment, surgical exploration of AIN is the indication of treatment. After recovery, patients may have the symptoms of fine motor disturbance and tingling. 목적: 전골간신경 증후군으로 진단되었던 환자들의 발병 원인에서 치료 과정 그리고 예후에 대해 임상 증례를 중심으로그 결과를 보고하고자 한다. 방법: 2009년 3월부터 2015년 12월까지 임상 증상과 근전도 검사에서 진단된 20명을 대상으로 하였다. 추시 된 환자의수지기능검사, 관절 가동범위 검사와 상지 기능 검사(the disabilities of the arm, shoulder and hand, DASH score) 그리고 근전도를 이용한 환자의 회복 정도를 확인했으며 설문을 이용한 회복 시점, 현재 남아있는 증상을 확인하였다. 결과: 전체 20명의 환자 중 원인을 모르는 경우가 12예로 가장 많았으며 6예에서 심한 일을 했거나 외상과 관계가 있었고, 2예에서 감염과 관계가 있었다. 보존적 치료를 시행한 15예 중 13예에서 증상의 회복이 있었고 수술적 치료는 5예에서 증상 발현 후 평균 8개월에 시행하였으며 2예에서 수술 후 약 9개월에 증상이 회복됐다. 설문 조사상 8예에서 무지와 인지의 미세 조절이 힘든 양상으로 남았으며 근력의 회복이 되지 않은 경우 근력 약화 이외에도 저린 증상도 포함되어 있었다. 결론: 포착 증후군의 가능성이 낮기 때문에 보존적 치료를 7개월 시행한 후 증상과 검사상 호전이 없다면 수술의 적응증이 될 수 있다. 증상의 회복 후에도 환자 자신만이 느끼는 미세 조절 기능 또는 처음에 없었던 저린 증상이 남아 있었다.

동통을 동반한 족관절의 만성 외측 불안정성에 있어서 마취하 스트레스 방사선 검사

최준영,안희찬,신명진,서진수,Choi, Jun Young,Ahn, Hee Chan,Shin, Myung Jin,Suh, Jin Soo 대한족부족관절학회 2017 대한족부족관절학회지 Vol.21 No.1

Purpose: Anterior drawer and varus stress radiographs are commonly to diagnose chronic lateral ankle instability. We compared the preoperative stress radiographs with the intraoperative radiographs under anesthesia to determine the accuracy and efficacy of stress radiographs in an outpatient clinical environment. Materials and Methods: Data was collected from patients who underwent a modified $Brostr{\ddot{o}}m$ operation for painful chronic unilateral lateral ankle instability between January 2014 and June 2016. Subjects were divided into three groups-complete tear, partial tear, and instability without rupture-according to the status of preoperative MRI findings of the anterior talofibular ligament. The anterior drawer and varus stress radiographs were taken preoperatively and intraoperatively under anesthesia. Results: Ninety-six patients, with a mean age of 29.63 years, were enrolled. There were 39, 46, and 11 patients in the complete tear, partial tear, and instability without rupture groups, respectively. On the anterior drawer and varus stress radiographs of the affected limb, talar anterior translation and varus tilting were significantly increased by 2.56 mm and $2.0^{\circ}$. The gaps between the unaffected limbs were also increased by 2.47 mm and $1.32^{\circ}$ after anesthesia. Although the stress radiographs were taken under anesthesia, the results were often smaller than the diagnostic value. Conclusion: Stress radiographs for painful chronic lateral ankle instability taken at the outpatient clinic might be inaccurate for diagnosis.

수부와 수지의 완전 절단에서 의도적으로 연기한 재접합술

천호준,우상현,안희찬,김경철 대한수부외과학회 2011 대한수부외과학회지 Vol.16 No.1

Purpose: We report the results of replantations which was intentionally delayed for a certain period of time in patients with an amputation of multiple digits, both hands or the single digit presented at night. Materials and Methods: Two staged intentianlly delayed replantations were performed in twenty patients. Three patients had amputations of four or more fingers, two had bilateral hand amputations and fifteen had a single digit amputation. Results: The mean warm ischemic time was 3 hours and 58 minutes. The mean cold ischemic time was 2 hours and 36 minutes for the first operation, and 15 hours and 13 minutes for the second operation. Twenty digits out of 28 digits (85%) survived completely. At the mean follow-up of months, functional results according to Chen’s criteria were rated as excellent in six patients, good in eight, and fair in five. Conclusion: When the patients had multiple finger amputations, bilateral hand amputations or presented late at night, intentional delay of the replantation also provide satisfactory outcomes. 목적: 다발성 수지의 절단이나 양측 손가락의 절단, 혹은 심야에 내원한 단일 수지의 절단에 대하여 재접합술을 두 단계로 나누어 시행하거나 일정 시간 연기하여 수술을 시행한 결과를 보고하고자 한다. 대상 및 방법: 20명의 환자에 대하여 일정 시간 지연한 재접합술을 시행하였다. 4개수지 이상 절단이 3명, 양측 수부 절단이 2명, 단일 수지 절단이 15명이었다. 결과: 접합까지 평균 온성 허혈 시간이 3시간 58분이였고, 냉성 허혈 시간은 첫 번째수술까지 평균 2시간 36분, 두 번째 수술까지 평균 15시간 13분이었다. 술 후 생존율은 28개 수지 중 24개 수지에서 재접합에 성공하여 85%의 생존율을 보였다. 결론: 밤늦게 시작해야 하는 수지 재접합술이나 긴 수술과 장시간의 마취를 요하는다발성 수지 절단 또는 양측 절단에서 두 단계로 나누어 유예 재접합술을 시행한 경우에도 만족할만한 결과를 얻을 수 있다.

압축점화기관에 CH₃(CH₂)₂CH₂OH 연료분사 시 연소특성에 관한 연구

김치원(Chi-won Kim),안희찬(Hee-chan An),김판호(Pan-ho Kim),김광대(Kwang-dae Kim),윤정민(Jeong-min Yoon) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3

Recently, compression ignition engines using diesel oil, because of better fuel economic, are rapidly gaining a large share of the market for passenger car application in addition to their more traditional use for heavy duty trucks and marine engines, but the problem of exhaust emission, particularly NOx and PM from CI engine has been focussed mainly in the view point of environment.<br/> In this experimental study, as the alternative fuel, n-Butyl alcohol and methanol fuel in tested with some blend fuels with diesel oil. The compression ignited type, diesel engines in equipped without turbor charger(NA), in intake manifold system for analyzing engine performance, combustion characteristics.

유리 동맥화 정맥 피판을 이용한 수지 연부조직 결손의 재건

이영근,우상현,이준모,안희찬,천호준,Lee, Young-Keun,Woo, Sang-Hyun,Lee, Jun-Mo,Ahn, Hee-Chan,Cheon, Ho-Jun 대한미세수술학회 2010 Archives of reconstructive microsurgery Vol.19 No.1

Purpose: To report the clinical results of the use of arterialized venous free flaps in reconstruction in soft tissue defects of the finger and to extend indications for the use of such flaps based on the clinical experiences of the authors. Materials and Methods: Eighteen patients who underwent arterialized venous free flaps for finger reconstruction, between May 2007 and July 2009 were reviewed retrospectively. The mean flap size was 4.7${\times}3.2$ cm. The donor site was the ipsilateral volar aspect of the distal forearm in all cases. There were 8 cases of venous skin flaps, 5 cases of neurocutaneous flaps, 4 cases of tendocutaneous flaps, 1 case of innervated tendocutaneous flap. The vascuality of recipient beds was good except in 4 cases (partial devascuality in 2, more than 50% avascuality (bone cement) in 2). Results: All flaps were survived. The mean number of included veins was 2.27 per flap. Mean static two-point discrimination was 10.5 mm in neurocutaneous flaps. In 3 of 5 cases where tendocutaneous flaps were used, active ROM at the PIP joint was 60 degrees, 30 degrees at the DIP joint and 40 degrees at the IP joint of thumb. There were no specific complications except partial necrosis in 3 cases. Conclusions: An arterialized venous free flap is a useful procedure for single-stage reconstruction in soft tissue or combined defect of the finger; we consider that this technique could be applied to fingers despite avascular recipient beds if the periphery of recipient bed vascularity is good.