혈관 부착 이식 비골에 발생한 피로골절

김형민,김윤수,이기행,정창훈,김준석,Kim, Hyoung-Min,Kim, Youn-Soo,Lee, Kee-Haeng,Jeong, Chang-Hoon,Kim, Jun-Seok 대한미세수술학회 2001 Archives of reconstructive microsurgery Vol.10 No.1

Purpose : The purpose of this study was to evaluate stress fracture of vascularized fibular grafts(VFG) by analyzing factors associated with stress fracture and the treatment results. Materials and Methods : From June 1985 to May 1998, 7 patients with stress fractures in the 38 patients with long bone defect who had vascularized fibular graft were evaluated with clinical and radiologic methods including grafted fibular length and hypertrophic index of de Boer. The average age of the patients was 35 years(range, $14{\sim}60$ years). The mean follow-up period was 20 months(range, $16{\sim}32$ months). Results: 7(18.4%) stress fractures occurred in 38 patients. Characteristics of the fractures were (1) all occurred at lower extremity of male patients treated with VFG for long bone defected caused by infected nonunion; (2) all occurred 10 months at the average(range, $4{\sim}17$ months) after VFG; and (3) the length and hypertrophic index of grafted fibula had no influence on the incidence of stress fracture. Union was obtained in 3 patients by conservative treatment. 4 patients obtained union by internal fixation; one at immediately onset of fracture; and three after failure of conservative treatment who had fracture around the knee joint. Conclusion : Stress fracture may occur during the first one year after vascularized fibular graft and more attention must be paid for prevention of it, especially in the cases of infected nonunion. Stress fracture around the knee joint was expected to lead to a good result of early union by operative treatment.

시부트라민(sibutramine) 음독 후 발생된 급성 정신병증 1례

김형민,우선희,최세민,소병학,Kim, Hyung-Min,Woo, Seon-Hee,Choi, Se-Min,So, Byung-Hak 대한임상독성학회 2009 대한임상독성학회지 Vol.7 No.2

A 38-year-old woman was admitted to our hospital due to agitation, nausea, chest discomfort, tachycardia and hypertension 6h after ingesting approximately 60 capsules of sibutramine. The woman developed the clinical features of acute psychosis, including auditory hallucination, agitation and paranoid ideation, on day 2. No relevant changes were detected on the laboratory examinations or on the electrocardiogram throughout the period of hospitalization. She was treated with risperidone and benzodiazepine. The symptoms subsequently resolved completely with cessation of the provoking agent. The patient was discharged on day 7 and the follow-up revealed no sequelae for 5 months.

Ga의 도핑농도에 따른 ZnO 박막의 특성

김형민,마대영,박기철,Kim, Hyoung Min,Ma, Dae Young,Park, Ki Cheol 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12

We have investigated the structural, electrical and optical properties of Ga-doped ZnO (GZO) thin films prepared by RF magnetron sputtering with laboratory-made ZnO targets containing 1, 3, 5, 7 wt% of $Ga_2O_3$ powder as a doping source. The GZO thin films show the typical crystallographic orientation with c-axis regardless of $Ga_2O_3$ content in the targets. The $3,000{\AA}$ thick GZO thin films with the lowest resistivity of $7{\times}10^{-4}{\Omega}{\cdot}cm$ are obtained by using the GZO ($Ga_2O_3$= 5 wt%) target. Optical transmittance of all films shows higher than 80% at the visible region. The optical energy band gap for GZO films increases as the carrier concentration ($n_e$) in the film increases.

혈관경 이식술을 이용한 거골의 외상성 무혈성 괴사의 치료 - 2례의 예비보고 -

김형민,정창훈,이기행,최문구,김윤수,고락현,Kim, Hyoung-Min,Jeong, Chang-Hoon,Lee, Kee-Haeng,Choi, Moon-Gu,Kim, Yoon-Soo,Ko, Lak-Hyun 대한미세수술학회 1999 Archives of reconstructive microsurgery Vol.8 No.1

Avascular necrosis is a significant late complication of talar neck fracture. However, treatment for early stage avascular necrosis has been not established. Two patients with post-traumatic avascular necrosis of talus treated with vascular pedicle graft using lateral tarsal artery were reviewed to determine the efficacy of procedure. The procedure involved grafting the lateral tarsal artery and vein into a hole made in the talus through a anterolateral approach. Follow-up was 12 and 24 months respectively. Two patients had significant pain relief, improved function, no worsening of their radiologic staging. The results are promising enough to recommend consideration of this procedure in early stages of avascular necrosis.

전방골간신경 증후군: 수술적으로 치료한 7예에 대한 임상적 고찰

김형민,정창훈,이상욱,노연태,박일중,Kim, Hyoung-Min,Jeong, Chang-Hoon,Lee, Sang-Uk,Roh, Youn-Tae,Park, Il-Jung 대한미세수술학회 2009 Archives of reconstructive microsurgery Vol.18 No.2

Purpose: The etiology and treatment strategy of the anterior interosseous nerve (AIN) syndrome are still controversial. Seven patients with the AIN syndrome who were treated by surgical exploration and neurolysis were reviewed at a mean of 35.9 months follow up period. Materials & Methods: There were six men and one woman. The mean age was 37.3 years, ranging from 26 to 59. No patient was related to trauma and associated neurological lesion. Surgical exploration was performed at 7.7 months after onset of paralysis. Results: All except one patients experienced pain around the elbow region before the onset of the palsy. On 7 patients, only the flexor pollicis longus was paralysed in 1, only the index flexor digitorum profundus in 2, and none had paralysis of the middle. The most common compression structures were fibrous bands within flexor digitorum sublimis arcade. However there was no demonstrable abnormality in three. Recovery was complete in all cases within 12 months after surgery. Conclusion: We recommended surgical exploration and neurolysis in patients who have shown no improvement after 6 months of conservative treatment. And careful preoperative examination is essential to avoid misdiagnosis and inappropriate surgery, especially in incomplete AIN syndrome.

회원작품 - 아산루

김형민,Kim, Hyeong-Min 대한건축사협회 1999 建築士 Vol.1999 No.4

고압 전기감전시 발생한 수근관절 주위의 진구성 연부조직 결손에 대한 유리 피판술

김형민,정창훈,이기행,고영석,Kim, Hyoung-Min,Jeong, Chang-Hoon,Lee, Gee-Heng,Koh, Young-Seok 대한미세수술학회 1998 Archives of reconstructive microsurgery Vol.7 No.1

With the advent of microvascular free-tissue transfer, this single stage resurfacing method for large scar and soft tissue defects around the wrist in the patients of electrical burn has distinctive advantage over the conventional multistage pedicle-flap transfer. Between 1992 and 1996, we treated 9 cases of 8 patients who had large scar around the wrist due to old electrical burn with free flaps as a preparation of staged tendon graft. Mean age was 30.3 years and average scar area was $6{\times}11cm$. The length of time the injury and free flaps was 9 months on an average. Prior to the free flap, we performed the angiography to all patients in order to evaluate the circulation of the forearm and hand and to choose the recipient vessel. In all cases, proximal ulnar arteries in the forearm remained intact and all radial arteries remained intact in 8 of 9 cases on angiogram. The interosseous arteries were well visualized in all cases. We used the ulnar arteries as a recipient artery. The types of flaps used were f scapular cutaneous flaps, 2 dorsalis pedis flaps and a radial forearm flap. Flap survial was 100 percents with satisfactory functional and cosmetic results. Free flaps using ulnar artery as a recipient artery is one of the useful reconstruction methods for the resurfacing of large scar around the wrist in the patients of old electrical burn.

결측 공변량을 갖는 혼합회귀모형에서의 EM 알고리즘

김형민,함건희,서병태,Kim, Hyungmin,Ham, Geonhee,Seo, Byungtae 한국통계학회 2016 응용통계연구 Vol.29 No.7

혼합회귀모형은 반응 변수와 공변량 사이의 관계를 규명하는 유용한 통계적 모형으로 여러 분야에서 사용되어지고 있다. 하지만 실제로 혼합회귀모형을 이용하여 분석을 하는 과정에서 공변량이 결측값을 포함하는 문제는 흔하게 발생하며, 발생하는 결측의 유형 또한 다양하게 나타난다. 이러한 경우에 있어서 본 논문에서는 최대우도추정량을 구하기 위한 EM 알고리즘을 제안하고자 한다. 제안된 EM 알고리즘의 효용성을 모의실험을 통해 확인하였으며 또한 사례연구를 통해 제시된 방법이 어떻게 사용될수 있는지와 그 효용성을 함께 확인하였다. Finite mixtures of regression models provide an effective tool to explore a hidden functional relationship between a response variable and covariates. However, it is common in practice that data are not fully observed due to several reasons. In this paper, we derived an expectation-maximization (EM) algorithm to obtain the maximum likelihood estimator when some covariates are missing at random in the finite mixture of regression models. We conduct some simulation studies and we also provide some real data examples to show the validity of the derived EM algorithm.

라이프스타일 재설계 프로그램이 뇌졸중 노인의 시간 사용과 삶의 질에 미치는 효과

김형민,전병진,Kim, Hyeong-Min,Jeon, Byoung-Jin 대한지역사회작업치료학회 2019 대한지역사회작업치료학회지 Vol.9 No.3

목 적 : 본 연구는 작업 균형(Occupational Balance)과 성공적인 노화연구(Well Elderly Research Study)를 이론적 근거로 라이프스타일 재설계 프로그램을 적용하여 뇌졸중 노인의 시간 사용과 삶의 질에 미치는 효과를 확인하고자 하였다. 연구방법 : 요양병원에 거주하는 뇌졸중 노인 총 40명(실험군 20명, 대조군 20명)을 대상으로 통제집단 사전사후검사 설계(pretest-posttest control group design)를 시행하였다. 라이프스타일 재설계 프로그램에 참여하기 전 2주 동안 사전평가를 실시하였고, 이 후 10주 동안 주 7회 라이프스타일 재설계 프로그램을 적용하였으며, 이 후 1주 동안은 사후 평가를 실시하였다. 대상자의 시간 사용은 통계청(2009) 생활시간 조사표를 사용하였고, 삶의 질의 경우 세계보건기구 삶의 질 평가도구(WHOQOL-BREF)를 사용하였다. 결과 : 프로그램 적용 전과 후의 시간 사용량 비교 결과 실험군의 경우 휴식과 수면(t=-4.89, p<.001), 여가(t=-4.67, p<.001)에서 통계적으로 유의한 차이를 확인할 수 있었다. 또한 집단 간 비교 결과 역시 휴식과 수면(t=-2.24, p<.01) 그리고 여가(t=3.57, p<.01)에서 통계적으로 유의한 차이가 나타났다. 삶의 질 비교 결과 두 그룹 간 통계적으로 유의한 차이가 나타났다(t=6.80, p<.001). 삶의 질 하위영역을 살펴보면 신체적 건강영역(t=6.08, p<.001), 심리적 건강영역(t=5.21, p<.001), 생활 환경영역(t=3.60, p<.01)에서 통계적으로 유의한 차이를 확인할 수 있었다. 결론 : 라이프스타일 재설계 프로그램은 요양병원에 거주하는 뇌졸중 노인의 휴식과 수면의 시간 사용은 줄이고, 여가생활에 참여하는 시간 사용을 늘려주었으며, 그로 인해 삶의 질이 향상되는 결과를 나타내었다. Objective : This study was designed to identify the effects on the time usage and quality of life of seniors with stroke by applying lifestyle redesign programs on the theoretical basis of the Occupational Balance. Method : A pretest-posttest control group design was conducted for a total of 40 stroke elderly people living in nursing homes(20 experimental and 20 control groups). Prior assessment was conducted for two weeks before the application of the lifestyle redesign program. For the next 10 weeks, the lifestyle redesign program was applied seven times a week. After that, a week of post-evaluation was conducted. The time usage for the subjects was analyzed by Life Time Survey Table of the National Statistical Office(2009) and life quality for them was analyzed by World Health Organization Quality of Life-BRIEF (WHOQOL-BRIEF). Result : The comparison of time usage before and after application of the program demonstrated that for the experimental group, rest and sleep(t=-4.89, p<.001), and leisure(t=-4.67, p<.00b1) showed significant differences. In addition, intergroup comparison results showed that there were also significant differences in rest and sleep(t=-2.24, p<.01) and leisure(t=3.57, p<.01). The comparison of life quality showed a significant difference between two groups(t=6.80, p<.001). If you look at the sub-area of quality of life, a significant difference was identified in physical health(t=6.08, p<.001), psychological health(t=5.21, p<.001), living environment area(t=3.60, p<.01). Conclusion : Lifestyle redesign program actually reduced the time usage for rest and sleep for elderly with stroke living in nursing homes, and increased the time for participating in leisure life resulting in improved quality of life.

RF 스퍼터링 시스템을 이용하여 증착한 비정질 Ga₂O₃ 박막의 급속 열처리 조건에 따른 결정성과 광학적 특성 변화

김형민,박상빈,홍정수,김경환,Hyungmin Kim,Sangbin Park,Jeongsoo Hong,Kyunghwan Kim 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6

The Ga₂O₃ thin films were deposited using an RF sputtering system and the effect of crystallographic and optical properties under rapid thermal annealing conditions on Ga₂O₃ thin film was evaluated. A rapid thermal annealing method can fabricate a crystalline Ga₂O₃ thin film which is applied to various fields with a low cost and a high efficiency compared with the conventional post-annealing method. In this study, the Ga₂O₃ treated at 900℃ for 1 min showed the beta and gamma phases in XRD measurement. In optical properties, the crystalline Ga₂O₃ represented a high transmittance of more than 80% in the visible region and was calculated with a high optical bandgap energy of 4.58 eV. The beta and gamma phases Ga₂O₃ can be obtained by adjusting the rapid thermal annealing temperatures, and the various properties such as the optical bandgap energy can be controlled. Moreover, it is expected that crystalline Ga₂O₃ can be applied to various devices by controlling not only temperature but process time.