• 제목/요약/키워드: Choi Chi Won

검색결과 274건 처리시간 0.031초

무지에 합지증이 동반된 사지증의 치험례 (The Correction of Clinodactyly on Thumb by Bone Graft from Deformed Metacarpal Region-Previous Correction of Polydactyly: Case Report)

  • 최치원;남수봉;배용찬
    • Archives of Plastic Surgery
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    • 제33권3호
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    • pp.379-382
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    • 2006
  • Clinodactyly is defined as an angulation of a digit in the radio-ulnar plane. This anomaly can be congenital, dominantly inherited, or acquired due to trauma or inflammation. Although the deformity usually causes little functional impairment, correction is made because of cosmetic problems. Male subject, with polydactyly on thumb(Wassel's type VII) received first surgery at the age of one. And at the age of six, abnormal growth on the radial side of the first metacarpal bone and ulnar deviation of the distal phalanx of the thumb at the interphalangeal joint had developed. The authors used the growing bony segment from the first metacarpal bone as a bone graft for the correction of clinodactyly on thumb. Z-plasty incision was made on the concave(ulnar) side of thumb and a wedge osteotomy was made on the distal phalanx. The bone graft was inserted into the gap of the distal phalanx of the thumb and fixed it with K-wires. Deformity of the metacarpal bone and clinodactyly on thumb was corrected effectively without donor site morbidity with noticible growth of the grafted metacarpal bone 12 months after surgery.

Clinical predictive factors of pathologic tumor response after preoperative chemoradiotherapy in rectal cancer

  • Choi, Chi Hwan;Kim, Won Dong;Lee, Sang Jeon;Park, Woo-Yoon
    • Radiation Oncology Journal
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    • 제30권3호
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    • pp.99-107
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    • 2012
  • Purpose: The aim of this study was to identify clinical predictive factors for tumor response after preoperative chemoradiotherapy (CRT) in rectal cancer. Materials and Methods: The study involved 51 patients who underwent preoperative CRT followed by surgery between January 2005 and February 2012. Radiotherapy was delivered to the whole pelvis at a dose of 45 Gy in 25 fractions, followed by a boost of 5.4 Gy in 3 fractions to the primary tumor with 5 fractions per week. Three different chemotherapy regimens were used (5-fluorouracil and leucovorin, capecitabine, or tegafur/uracil). Tumor responses to preoperative CRT were assessed in terms of tumor downstaging and pathologic complete response (ypCR). Statistical analyses were performed to identify clinical factors associated with pathologic tumor response. Results: Tumor downstaging was observed in 28 patients (54.9%), whereas ypCR was observed in 6 patients (11.8%). Multivariate analysis found that predictors of downstaging was pretreatment relative lymphocyte count (p = 0.023) and that none of clinical factors was significantly associated with ypCR. Conclusion: Pretreatment relative lymphocyte count (%) has a significant impact on the pathologic tumor response (tumor downstaging) after preoperative CRT for locally advanced rectal cancer. Enhancement of lymphocyte-mediated immune reactions may improve the effect of preoperative CRT for rectal cancer.

Purification and Characterization of Manganese Superoxide Dismutase from Staphylococcus sciuri

  • Song, Chi-Hyun;Park, Eun-Kyung;Suh, Hyung-Joo;Lee, Yong-Se;Choi, Jang-Won;Ra, Kyung-Soo
    • Journal of Microbiology and Biotechnology
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    • 제9권3호
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    • pp.271-275
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    • 1999
  • The intracellular superoxide dismutase (SOD) from Staphylococcus sciuri was isolated to homogeneity by continuous steps, including ammonium sulfate fractionation, DEAE-ion-exchange chromatography, gel filtration, and phenyl hydrophobic gel chromatography. Pure SOD had a specific activity of 4,625 U/mg and was purified 158-fold with a yield of 31 % from a cell free extract. The molecular weight of the purified SOD was determined to be approximately 35.5 kDa by gel filtration and the enzyme was also shown to be composed of dimeric subunits on denaturing SDS-PAGE. The enzyme activity remained stable at pH 5 to 11 and also to heat treatment of up to $50^{\circ}C$ at pH 7.8, with 80% relative activity. The enzyme was insensitive to cyanide, hydrogen peroxide, and azide, indicating that it is a manganese-containing SOD. The EPR spectrum showed the enzyme containing manganese as a cofactor.

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물가변동에 따른 계약금액 조정방식의 지수조정율 산출에 관한 연구 (A Study on the Escalation Method for Contract Adjustment Public Construction Project)

  • 배경태;최동수;황치원
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2005년도 추계 학술논문 발표대회
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    • pp.117-120
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    • 2005
  • The business market of architecture has got a system that controls a deposit according to the price function. This system is written on a law of contract about countries. So the main body of construction has to make a reasonable contract. This study is written about a rate of numerical index on controling a deposit. We tried to fine problems and solutions of labor expenses, instrument costs and material costs which is so big and changable on the construction market Labor expenses are expressed according to the rate of construction scale between direct and indirect cost that applies ability of works. Instrument costs are expressed according to an output method of a unit price annually and a weight allowance of local instrument conditions and use frequence. The last material costs expressed according to a local weight allowance make a decision of the material cost index. They applies locally relative index more than absolute one on what uses the price rate of producers and importations. This solutions are not enough to apply to the real market, so it needs to exam and to be on the market after a feasibility study.

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신라수창군호국성팔각등루기의 분석 (Analysis of the Document Concerning Octagonal Lantern Shaped Pavilion Located in Hoguk Fortification in Soochang County, Silla)

  • 김창호
    • 고문화
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    • 57호
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    • pp.145-155
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    • 2001
  • <동문선> 권 64에는 신라말 최치원이 지은 $\ulcorner$신라수창군호국성8각등루기$\lrcorner$가 실려 있다. 이에 대한 선학들의 연구에서는 등루기의 주인공인 이재를 대구지역의 호국으로 보아 왔다. 여기에서는 선학들의 연구성과, 역사지리적인 접근, 불교사에 대한 기본상식 등을 근거로 전문의 제시와 함께 이를 해석하였다. 등루기에 나타난 계명 등의 위치를 고고학적 측면에서 현지 답사를 근거로 새로 비정하였다. 그것은 호국성의 위치가 대덕산성이고, 8각등루는 대덕산성의 안지랭이 골에서 출발한 대덕산성의 산정 근처에 위치하며, 곤유를 땅으로 해석하여 달불성의 위치가 달성공원이고, 마정계사는 현재의 송림사임을 밝혔다. 등루기에 나타난 불교에 대해서는 간단히 검토하였다. 등루기에 나오는 승려들의 대부분은 동화사 출신이고, 법상종 계열의 승려로 보았다. 9세기말에 대구 지역에 법상종의 사찰들이 있었음은 새롭게 확인한 부분이다. 이재의 역사적인 위에서 최치원이 최후까지 신라에 충성을 다하는 지식인이었고, 이재 또한 고러한 유형의 관리이므로 최치원은 이재를 통해 자신의 신라를 향한 애국심을 쓴 것이 본 등루기라고 해석하였다.

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수 차례 재발한 스파르가눔증으로 치료를 받았던 환자에서 발생한 폐 스파르가눔증 1예 (A Case of Pulmonary Sparganosis in a Patient with a History of Recurrent Sparganum Infections)

  • 오윤정;김미진;조준형;차치운;김도훈;오미정;진재용;최성실;권계원
    • Tuberculosis and Respiratory Diseases
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    • 제67권3호
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    • pp.229-233
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    • 2009
  • Sparganosis is a zoonosis caused by the migrating larvae of cestode genus Spirometra. We report a rare form of sparganosis that invades the lung. A 44-year-old man presented with newly appeared pulmonary nodules that were found accidentally on regular medical checkup, and on sequential chest CT, which we checked at an interval of every 2 months, revealed that the pulmonary lesion had migrated. The patient had a medical history of having undergone surgical excisions for sparganosis in muscles and in subcutaneous tissues of the lower abdomen, perianus, thigh, right axilla, and scapula area, several times over 7 years. A right middle lobectomy was performed and the lesion was diagnosed as sparganosis based on the characteristic histological findings.

베트남 연약지반에서의 현장타설말뚝 설계 사례 (A Case Study on the Design of Drilled Shaft on Soft Ground in Vietnam)

  • 서원석;조성한;최기병
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2008년도 추계 학술발표회
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    • pp.591-604
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    • 2008
  • In this study, two design examples of drilled shafts on soft ground in Ho-Chi-Minh City, Vietnam are introduced. One is for a 27-story apartment and the other is for a Arch bridge over Saigon river. Unlikely the normal cases in Korea, all of the bored pile foundations are supposed to be placed on soil layers. Therefore, skin friction between pile and ground is the most crucial design parameter. Three methods using SPT N value of sandy soil -Korean Road Bridge Code(1996), Reese and Wright (1977), and O'Neill and Reese (1988)- were adopted to obtain an ultimate axial bearing capacity. In order to verify the calculated bearing capacity, 3 sets of static load test and a Osterberg Cell test were performed at an apartment site and a bridge site respectively. LRFD (Load Resistance Factored Design) method was compared with ASD (Allowable Stress Design) method. On application of ASD method, safety factor for skin friction was adopted as 2 or 3 while safety factor for end bearing was 3. The design bearing capacities from ASD method matched well with those from LRFD method when safety factor for skin friction was adopted as 2.

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Oxide/Organic Hybrid TFTs for Flexible Devices

  • Yang, Shin-Hyuk;Cho, Doo-Hee;KoPark, Sang-Hee;Lee, Jeong-Ik;Cheong, Woo-Seok;Yoon, Sung-Min;Ryu, Min-Ki;Byun, Chun-Won;Kwon, Oh-Sang;Cho, Kyoung-Ik;Chu, Hye-Yong;Hwang, Chi-Sun;Ahn, Taek;Choi, Yoo-Jeong;Yi, Mi-Hye;Jang, Jin
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.393-395
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    • 2009
  • We fabricated oxide and oxide/organic hybrid TFTs on a glass substrate using the photolithography process under $200^{\circ}C$. We adopt the solution processed organic ferroelectric materials of P(VDF-TrFE) and polyimide (KSPI) insulator for 1-T structure memory and flexible device, respectively. All devices have successfully operated and showed the possibility of hybrid TFTs for the application to the flexible electronic devices.

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SDR 시스템을 위한 MPI 기반 WiMAX 기지국의 구현 (Implementation of MPI-based WiMAX Base Station for SDR System)

  • 안치영;김효한;최승원
    • 디지털산업정보학회논문지
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    • 제9권4호
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    • pp.59-67
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    • 2013
  • Compared to the conventional Hardware-oriented base stations, Software Defined Radio (SDR)-based base station provides various advantages especially in flexibility and expandability. It enables the multimode capability required in 4th-generation (4G) environment which aims at a convergence network of various kinds of communication standards. However, since a single base station processes all data required in various multiple waveforms, the SDR base station faces a problem of data processing speed. In this paper, we propose a new concept of SDR base station system which adopts a parallel processing technology of clustering environment. We implemented a WiMAX system with SDR concept which adopts the Message Passing Interface (MPI) technology which enables the speed-up operations. In order to maximize the efficiency of parallel processing in signal processing, we analyze how the algorithm at each of modules is related to data to be processed. Through the implemented system, we show a drastic improvement in operation time due to parallel processing using the proposed MPI technology. In addition, we demonstrate a feasibility of SDR system for 4G or even beyond-4G as well.

Study on Characteristic difference of Semiconductor Radiation Detectors fabricated with a wet coating process

  • Choi, Chi-Won;Cho, Sung-Ho;Yun, Min-Suk;Kang, Sang-Sik;Park, Ji-Koon;Nam, Sang-Hee
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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    • pp.192-193
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    • 2006
  • The wet coating process could easily be made from large area film with printing paste mixed with semiconductor and binder material at room temperature. Semiconductor film fabricated about 25mm thickness was evaluated by field emissions-canning electron microscopy (FE-SEM). X-ray performance data such as dark current, sensitivity and signal to noise ratio (SNR) were evaluated. The $Hgl_2$ semiconductor was shown in much lower dark current than the others, but the best sensitivity. In this paper, reactivity and combination character of semiconductor and binder material that affect electrical and X-ray detection properties would prove out though experimental results.

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