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Czochralski법을 이용한 금속 단결정의 성장과 구조적, 전기적 성질에 관한 연구
박정훈,차수영,박상언,김성규,조채룡,박혁규,김형찬,정명화,정세영,Park, Jeung-Hun,Cha, Su-Young,Park, Sang-Eon,Kim, Sung-Kyu,Cho, Chae-Ryong,Park, Hyuk-K.,Kim, Hyung-Chan,Jeong, Myung-Hwa,Jeong, Se-Young 한국결정학회 2005 韓國結晶學會誌 Vol.16 No.2
It is well known that the general metals have a lot of grain boundaries. The grain boundaries play a negative role to increase the resistivity and to decrease the conductivity. The small resistivity and the large conductivity have been a goal of the material scientists, and no signal noise, perfect signal transfer, and the realization of the real sound are the dream of electronic engineers and audio manias. Generally, oxygen free copper (OFC) and Ohno continuous casting (OCC) copper cables have been used for the purpose of the precise signal transfer and low noise. However they still include a lot of grain boundaries. In our study, we have grown the single crystal by the Czochralski method and succeeded to produce single crystal wires from the crystal in the dimension of $0.5{\times}0.5{\times}2500mm$. The produced wire still possesses very good single crystal properties. We observed the structure of the wire, and measured the resistance and impedance. Glow Discharge Spectrometer (GDS) was used for analyzing the compositions of copper single crystals and commercial copper. Current-Voltage curve, resistance, total harmonic distortion and speaker frequency response were measured for comparing electrical and acoustic properties of two samples.
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최지훈(Ji Hoon Choi)ㆍ강민규(Min Kyu Kang)ㆍ김명세(Myung Se Kim)ㆍ김성규(Sung Kyu Kim)ㆍ윤상모(Sang Mo Yun)ㆍ김성훈(Sung Hoon Kim) 대한방사선종양학회 2010 Radiation Oncology Journal Vol.28 No.2
목 적: 본 연구는 위암 환자에서 근치적 수술과 수술 중 방사선치료(intraoperative radiotherapy)를 시행한 장기 추적 결과를 보고하고자 한다.대상 및 방법: 1988년부터 1994년까지, 51명의 원발성 국소진행성 위암 환자에게 근치적 수술과 수술 중 방사선치료를 시행하였다. 수술 후 외부방사선치료는 30명의 환자에서, 보조 항암화학요법은 35명의 환자에서 시행되었다.수술 중 방사선치료는 9 MeV의 전자선을 이용하여 15 Gy를 조사하였으며, 외부방사선치료 조사선량의 중앙값은43.2 Gy (7.2∼45 Gy)이었다. 보조 항암화학요법은 35명에서 시행되었다. 추적관찰기간의 중앙값은 64개월(1∼ 254개월)이었다.결 과: 환자의 나이는 30∼71세(중앙값, 58세)였다. American Joint Committee on Cancer (AJCC) tumor-notemetastasis(TNM) 병기(2002)는 병기 I 13명(25.5%), 병기 II 10명(19.6%), 병기 III 25명(49.0%), 병기 IV 3명(5.9%)이었다. 주된 재발은 원격전이로 11명이었으며, 이 중 1명에서 국소재발이 동시에 발견되었다. 전체 환자의 5년 국소영역제어율, 무병생존율, 전체생존율은 각각 94.7%, 66.5%, 51.7%이었다. 다변량분석에서 전체생존율에 영향을 주는 인자에는 나이, TNM 병기, 외부방사선치료가 있었으며, 무병생존율에 대해서는 TNM 병기만이 유의한 인자였다. 결 론: 국소 진행성 위암에서 근치적 수술과 수술 중 방사선치료로 높은 국소제어율을 얻을 수 있었다. 그러나 수술 중 방사선치료의 생존율에 대한 영향에 대해서는 연구가 더 필요할 것으로 생각된다. Purpose: We retrospectively analyzed the long-term results of radical surgery and intraoperative radiation therapy(IORT) in patients with stomach cancer. Materials and Methods: From 1988 to 1994, 51 patients were treated with curative surgery and IORT. Postoperative external beam radiotherapy (EBRT) was administered to 30 patients, while adjuvant chemotherapy was administered to 35 patients. A dose of 15 Gy was irradiated with a 9 MeV electron beam as the IORT and a median dose of EBRT was 43.2 Gy (range, 7.2 to 45 Gy). The follow-up period ranged from 1∼254 months, with a median follow-up period of 64 months. Results: The median age of all the patients was 58 years (range, 30 to 71 years). The distribution of pathologic stage (American Joint Committee on Cancer [AJCC] 2002 tumor-note-metastasis [TNM]) was as follows: 13 stage I (25.5%), 10 stage II (19.6%), 25 stage III (49.0%), and 3 stage IV (5.9%). Distant metastases occurred in 11 patients (10 in the peritoneum and 1 in bone), including one patient with concurrent local recurrence (anastomosis site). The 5-year locoregional control, disease free survival and overall survival rates were 94.7%, 66.5%, and 51.7%, respectively. For the multivariate analysis, age, TNM stage, and EBRT were significant prognostic factors for overall survival, and only TNM stage for disease free survival. Conclusion: We could have achieved a high loco-regional control rate in patients with locally advanced stomach cancer by adding IORT to radical surgery. However, the benefit of IORT on survival remains to be elucidated.
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