응력완화용 완충재를 사용한 알루미나와 Ni-Cr-Fe 합금의 접합

이우천 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8

In order to prevent the cracking and fracture generated in the alumina/Inconel 600 joints after cooling, three types of insert materials with Ag-Cu-Ti filler metals was used in the joints. Effect of insert materials on the crack formation of the joints was investigated. The joints free from cracks were obtained when the laminates consisting of niobium of 250 ㎛ thick and copper of 50 ㎛ thick were used as insert materials. For the joints cooled at the rate of 4.8 ℃/min after brazing at 1113 K for 1.2 ks, the average shear strength was 75.7 MPa and the strength distribution showed the mixed mode.

종골 골절의 치료 급성 골절과 부정 유하에 대한 최신 치료 경향

이우천 대한골절학회 2007 대한골절학회지 Vol.20 No.4

한의과대학 부속 한방병원의 재무비율 분석 -본원과 분원의 비교를 중심으로-

이우천,Lee, Woo-Chun 대한예방한의학회 2014 대한예방한의학회지 Vol.18 No.1

This study was conducted to analyze if there is a difference between the head hospital and branch hospital by comparing the profitability and operating expenses to patient revenue of oriental medicine hospitals affiliated with universities in order to find whether opening branch hospitals is an appropriate method to increase profitability. Profit indices used for the comparison of head hospital and branch hospital include ratio of operating profit on medical revenue, net-income on medical revenue, net profit to total assets, and operating profit to total assets; and cost indices included ratio of labor costs, material costs and administrative costs. In comparison of profit indices of head hospitals and branch hospitals, head hospitals displayed negative(-) in all four profit index averages while branch hospitals displayed positive(+), showing that branch hospitals have higher profitability. In particular, in the case of head hospitals, ratio of net profit to total assets was -13.6%, while that of branch hospitals was 12.9%, which was higher than 3.1%, the average of Korean oriental medicine hospitals in 2011. As a result of difference analysis between groups of head hospitals and branch hospitals, profit indices of ratio of operating profit on medical revenue, net-income on medical revenue, and ratio of net profit to total assets were found to vary by hospitals, but there was no statistically significant difference between head hospitals and branch hospitals(p<0.1). Only the ratio of operating profit to total assets of head hospitals and branch hospitals indicated significant difference between the two groups, showing that ratio of operating profit to total assets of branch hospitals is larger than that of head hospitals. Meanwhile, the cost indices of ratio of labor costs, material costs and administrative costs in the difference test results did not show significant difference between the head hospital and branch hospital(p<0.1). Thus, it cannot be said that a certain oriental medicine hospital's profitability is high or low depending on whether it is head hospital or a branch as profitability varies depending on the management environment of the hospital. Therefore, oriental medicine hospitals affiliated with universities would need to make efforts to increase their profitability as an individual hospital rather than focusing on whether they are head hospital or a branch.

강원도 산학 협력 프로그램 운영 방안 사례

이우천,박노국 대한안전경영과학회 2011 대한안전경영과학회 학술대회논문집 Vol.2011 No.2

대학(부속) 한방병원의 재무비율과 경영성과

이우천 한국벤처창업학회 2012 한국벤처창업학회 학술대회 Vol.2012 No.4

염좌 후에 발생한 족관절 누공

이우천,김정훈,송재국,문정석,Lee, Woo-Chun,Kim, Jung-Hoon,Song, Jae-Kuk,Moon, Jeong-Seok 대한족부족관절학회 2002 대한족부족관절학회지 Vol.6 No.2

Purpose: To investigate the clinical features of fistulas of the ankle joints. Materials and Methods: Seven fistulas in seven patients were reviewed during Apr. 2000 to Mar. 2002, retrospectively. There are five men and two wemen. Average age was 47.7 years (range, 42-65 years). Average follow-up period was 1.4 years. There were six cystic lesions after ankle sprain and one patient with persistent discharge after excision of bursa over lateral malleolus. Results: Duration from injury to presentation was average 9.8 years. The site of preoperative swelling was mostly over the lateral malleolus in five patients. In one patient, the area of swelling was extended to the anterolateral ankle joint and in another patient there was extensive swelling from Achilles tendon to the anterolateral ankle joint. Concomitant symptoms were instability in three patients, pain and instability in three patients. Methods of surgery were simple repair in one, modified Brostrom in three, augmentation with periosteal flap in addition to modified Brostrom in two and Chrisman-Snook in addition to augmentation with periosteal flap and modified Brostrom in one. There were no recurrence of instability as well as fistula. Conclusion: We think that the fistula of the ankle joint should be included in the differential diagnosis of the cystic lesion over the lateral malleolus and the result of surgical treatment would be satisfactory in most cases.

족관절 퇴행성 관절염의 방사선학적 분석

이우천,강영훈,Lee, Woo-Chun,Kang, Yeong-Hun 대한족부족관절학회 2005 대한족부족관절학회지 Vol.9 No.2

Purpose: This study was performed to investigate the radiological characteristics of the degenerative arthritis of the ankle using the standing radiographs. Materials and Methods: From June 2001 to May 2005, 36 patients (56 ankles) who were treated for osteoarthritis of ankle were analysed. Angle of tibial shaft and tibial joint surface on AP view (TSA), angle of tibial joint surface on lateral view (TLS), tibial and medial malleolus angle (TMM) and talo-1st metatarsal angle were checked on standing radiograph. The patients with medial joint and total joint involvement were categorized into three stages according to the location of involvement. The degree of joint space narrowing was categorized into two groups. Results: There were no significant differences in TSA, TLS, TMM and talo-1st metatarsal angle with regard to the stage of arthritis. However, the difference between the less severe group and the severe group existed. Conclusion: Angular deformity was not correlated with stage, but correlated with severity. The deformity of distal tibial articular surface does not seem to be a cause of primary osteoartiritis, but rather a result from it.

성인 당뇨병 환자의 족부와 신발에 대한 조사

이우천,Lee, Woo-Chun 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.2

Purpose: To investigate the status of foot, preventive foot care and appropriateness of shoe size in patients with diabetes. Materials and Methods: One hundred and sixty-five patients who visited endocrinology clinic due to clinically proven diabetes mellitus were studied. Average age was 59.3 years (range, 36-90 years) and average duration of diabetes was $9.6{\pm}8.2$ years. Patients were questioned about their basic educational level and their foot and ankle problems. Physical examination of the foot was done including sensation testing of four areas of plantar surface with the 5.07 monofilament. Both feet and shoes were measured for width, length and the height of toes and toebox. Shoes were defined as properly fitting the foot if it is 5mm wider than the foot, and $20{\pm}30\;mm$ longer than the foot, and the height of toebox is more than 5mm higher than the height of the toes. Results: 48.5 percent of the patients were educated about how to select an appropriate shoewear. 47.3 percent of the patients had symptoms of neuropathy and 42.4 percent of patients were unable to feel the monofilament in at least one area. 25.5 percent of the patients had appropriate shoes in length, 63.6 percent of the patients in width, and 72.7 percent of the patients in the height of toebox. Conclusion: This study suggets that more patients needs to be educated about foot care and appropriate shoes which have adequate height of toebox as well as the length and width.

증세가 있는 비골하 부 골

이우천,고한석,권강진,김승우,Lee, Woo-Chun,Ko, Han-Suk,Kwon, Kang-Jin,Kim, Sung-Woo 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.2

Purpose: To investigate clinical features and treatment of os subfibulare Materials and Methods: This is a retrospective study on twenty-eight patients who have symtoms associated with os subfibulare. We reviewed charts and radiographs. Thirteen patients were treated surgically and fifteen patients were treated conservatively. We analysed clinical results in 25 patients who were followed for more than one year. Results: Duration from the onset of symtoms to treatment was more than six months in twelve of thirteen surgically treated cases, and in only two of fifteen conservative treated cases. Surgical procedures were internal fixation of the os subfibulare in two patients, and resection of os subfibulare and ligament reconstructions in eleven patients. Clinical results were excellent in six, good in three and poor in two of operatively treated patients. In conservatively treated patients, five excellent, five good, one fair and one poor clinical results were obtained. Conclusion: Os subfibulare is not necessarily a cause of instability and pain, but in cases with chronic pain and/or instability, surgical treatment would result in satisfactory result.

성인의 증세가 있는 부주상골

이우천,남기헌,박현수,라종득,이철,고강훈,Lee, Woo-Chun,Nam, Ki-Heon,Park, Hyun-Su,Rha, Jong-Deuk,Lee, Cheol,Ko, Kang-Hoon 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.1

Purpose: to investigate the etiology and the results of surgical treatment of the symptomatic accessory navicular in adults. Materials and Methods: Between 1996 and 2000, 17 cases in 16 adult patients who were older than 20 years were diagnosed as painful accessory na vicular. 11 patients could recall a twisting injury of the ankle, and 8 of them were inversion sprain. 4 patients had tibialis posterior tendon lesions. 13 feet of 12 patients were treated by resection of accessory navicular, the synchondrosis, the medial portion of the navicular and reattachment of tibialis posterior tendon without transposition. 9 feet in 8 patients were followed for more than one year after surgery. In 4 patients with tibialis posterior tendon lesions, additional procedures were performed according to the state of the lesion. Results: All were type II accessory navicular bone which had synchondroses. There was gross motion of the synchondrosis in 'the operating field in all feet. Of the 9 feet which were followed for more than one year after surgery, results were excellent in five and good in four. Conclusion: The painful accessory navicular in adult might be closely associated with inversion ankle sprain, and also with the tibialis posterior tendon lesions. Satisfactory result could be obtained without transposition of the tibialis posterior tendon to the undersurface of the navicular and immediate postoperative weight bearing does not have harmful effect on the result.