• Archives of Reconstructive Microsurgery
• /
• 제3권1호
• /
• pp.81-89
• /
• 1994

Firstly the wrap-around free flap from the great toe was transferred successfully by Morrison and O'Brien in 1980 for reconstruction in chronic case of amputated thumb distal to the MP joint. Since then, significant bone peg resorption and grafted bone fracture have been reported in most of cases after operation. We have performed thumb reconstructions within 2 weeks after injury in 11 cases which included acute crushing injuries or failed replantation of thumb at Guro Hospital from September, 1983 to October, 1993. The results obtained from this study are as follows: 1. There were 8 males and 3 females and the mean age was 28.8 years old ranged from 3 years old to 50 years old. 2. The most common injury mechanism was machinary injury in 10 of 11 cases. 3. We have performed thumb reconstructions by using wrap-around free flap from the great toe without bone graft in 6 cases and with bone graft in 5 cases within 2 weeks after injury. 4. During 6 years and 1 month mean follow-up period, there were bone resorptions in 3, grafted bone fracture in 1, infections in 2 and soft tissue necrosis in 3 cases. 5. We obtained satisfactable results in respect of function and cosmesis and urged to use this flap for reconstruction in acute thumb injury.

• 한국초지조사료학회지
• /
• 제32권1호
• /
• pp.75-84
• /
• 2012

본 연구는 겨울철과 여름철에 답리작 사료작물의 랩사일리지 생산에서 연구보고된 조사료 재배품종과 재배방법을 기준으로 하였을 때, 소요 기계에 따른 기계화 생산 작업의 특성과 부담면적, 기계 이용비용을 분석하여 조사료 생산비용을 산출하였다. 생산비용은 작물종류(호밀, 청보리, IRG, 수단그라스), 파종방법(산파, 조파)과 트랙터 마력(50, 75, 100, 130 ps)에 따른 경작규모별(부담면적 ha별), 부담면적대비 경작지비율별(25, 50, 75, 100%), 작부체계별(품종 숙기별, 동 하계 작물별)로 분류하여 산출하였다. 트랙터 100 ps, 조파를 기준으로 단일 품종 재배보다 호밀, IRG와 청보리 등을 품종 숙기별로 재배할 때 파종은 20일에서 30일로, 수확은 약 30일에서 40일로 시기가 늘어나기 때문에 부담면적이 57.1 ha에서 77.5 ha로 증가하였다. 동 하계 작물 연중 재배시 생산비용은 100 ps 트랙터, 조파, kg-TDN 기준으로 호밀+수단은 250원, 청보리+수단은 215원, IRG+수단은 234원, 호밀+청보리+IRG+수단은 233원으로 나타났다. 이는 연중 재배하지 않는 경우에 비해 고정비가 줄어들기 때문에 생산비용은 약 30~50% 절감되었다. 따라서 답리작 사료작물의 랩사일리지 생산시 노동피크와 수확시기의 분산, 기계장비의 효율성을 제고할 수 있도록 품종 숙기별 연중 재배 작부체계의 이용이 바람직한 것으로 판단되었다.

• 한국통신학회논문지
• /
• 제26권12C호
• /
• pp.181-189
• /
• 2001

본 논문에서는 ATM 망의 트래픽 제어 기능 중의 하나인 감시 알고리즘을 제안하고 칩(chip)을 설계하였으며, VHDL을 사용하여 구현하였다. 제안한 알고리즘은 우선순위가 높은 셀의 손실을 최소로 하고, 트래픽의 다중화 및 역다중화 과정에서 발생되는 트래픽의 군집성을 해소할 수 있다는 장점을 갖고 있다. 구현한 칩은 입력 모듈과 UPC 모듈, 출력 모듈의 3부분으로 이루어지며, 편의상, UPC 모듈에서는 메모리 제어시 메모리 어드레스 즉, 커넥션 테이블의 index를 VCI(Virtual Channel Identifier)와 동일하게 할당하였다. 또한 UPC 모듈의 VSA(Virtual Scheduling Algorithm)블럭에서 셀의 도착시간을 계수하는 카운터가 랩-어라운드(wrap-around)할 때 생기는 VSA의 오류를 보정해 줄 수 있는 방법을 제안하였다.

• 한국CDE학회논문집
• /
• 제18권1호
• /
• pp.71-82
• /
• 2013

To modify product design easily, modern CAD systems adopt the feature-based model as their primary representation. On the other hand, the boundary representation (B-rep) model is used as their secondary representation. IGES and STEP AP203 edition 1 are the representative standard formats for the exchange of CAD files. Unfortunately, both of them only support the B-rep model. As a result, feature data are lost during the CAD file exchange based on these standards. Loss of feature data causes the difficulty of CAD model modification and prevents the transfer of design intent. To resolve this problem, a tool for recognizing design features from a B-rep model and then reconstructing a feature-based model with the recognized features should be developed. As the first part of this research, this paper presents a method for decomposing a B-rep model into simple volumes suitable for design feature recognition. The results of experiments with a prototype system are analyzed. From the analysis, future research issues are suggested.

• Archives of Reconstructive Microsurgery
• /
• 제5권1호
• /
• pp.1-15
• /
• 1996

From Fabuary 1982 to May 1995, 396 patients had undergone reconstructive surgery of the upper and lower limb with microsurgical technique at department of orthopaedic surgery, Yonsei University of Medicine. The results were as follows; 1. Average age at the time of operation was 23.4years(2-64 years), and there were 277 male and 119 female patients. 2. Among 324 patients of soft tissue flap(87 inguinal flap, 132 scapular flap, 38 latissimus dorsi flap, 11 latissimus dorsi and scapular combind flap, 6 gracilis flap, 12 deltoid flap, 3 tensor facia lata flap, 11 dorsalis pedis flap, 6 lateral thigh flap, 12 wrap around flap, 1 lateral arm flap, 5 musculocutaneous flap), 274 cases(85.5%) were succeed. 3. Among 37 patients of vascularized bone graft(18 fibular bone graft, 11 iliac bone graft, 7 toe to finger transplantation,1 vascular pedicle rib graft), 30 cases(80.1%) were succeed. 4. In 26 cases of segmental resection and rotationplasty at lower extremity, 23 cases were succeed. 5. In 7 cases of Tikhoff-Linberg procedure and in 2 case of segmental resection and replantation, all case was succeed. Overall success rate of microscopic reconstructive surgery was 85.6%. In conclusion, microsurgical technigue is valuable for reconstruction of tissue defect or function loss of the limb.