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지반투과 레이더 시스템을 위한 SRD 임펄스 발생기 및 안테나의 설계 및 제작에 관한 연구
김형종,신석우,최길웅,최진주,신상열,Kim, Hyoung-Jong,Shin, Suk-Woo,Choi, Gil-Wong,Choi, Jin-Joo,Shin, Shang-Youal 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
In this paper, a ground penetrating radar(GPR) system is implemented for landmine detection. The performance of the GPR system is associated with the characteristics of local soil and buried target. The choice of the center frequency and the bandwidth of the GPR system are the key factors in the GPR system design. To detect a small and shallow target, the higher frequencies are needed for high depth resolution. We have been designed, fabricated and tested a new impulse generator using step recovery diodes. The measured impulse response has an amplitude of 6.2V and a pulse width of 250ps. The implemented GPR system has been tested real environmental conditions and has proved its ability to detect a small buried target.
정종화(Chung Chong Hwa),신석우(Shin Suk Woo),이재학(Lee Jae Hack) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.4
N/A Primary cancer of the Gallbladder is not uncommon. The prognosis is poor because (1) preoperative diagnosis is difficult, (2) the tumor usually invades the ]iver and adjacent structures by the time of operation and (3) the responses to chemo and/or radiotherapy are poor. A clinical review was carried out in 23 cases of primary Gallbladder cancer patients received the operation at the Department of Surgery, St. Mary's Hospital, Catholic University Medical College between Feb. 1976 and Apr. 1988. The results were as follows. 1) The range of age was 24 to 60 years old, and the peak incidence was in 41 to 60 years old age group with its number of 19 (83%). 2) The ratio of male to female was about 1:2. 3) The clinical symptoms in order of frequency were as follows; epigastric and right upper quadrant pain (82%), indigestion (39%.), nausea and vomiting (39%), jaundice (26%), weight loss (22%). 4) The duration of the symptoms was mostly within 3 months (78%). 5) In preoperative diagnosis, the primary cancer of the Gallbladder was only 9 cases (39%). 6) Surgical procedures were performed as follows; Radical procedures (8 cases, 35%), Palliative procedures (11 cases, 43%) and Laparotomy with biopsy (4 cases, 17%). 7) The tumor was limited to the Gallbladder in 3 cases (13%). Extra-GB invasions were liver (11 cases, 48%), CBD (8 cases, 35%), adjacent lymph nodes, duodenum and peritoneum (each 4 cases, 17%). 8) Gallstones were present in 8 cases (35%.). 9) Adenocarcinoma was the most frequently encountered type (16 cases, 74%), and squamous cell carcinoma (5 cases, 22%), undifferent carcinoma (2 cases, 19%).
브라운관의 자기장 영향 분석용 저자기장 제어 장치의 설계 및 제작
박포규(Po Gyu Park),김영균(Young Gyun Kim),신석우(Suk Woo Shin),최형호(Hyung Ho Choi),김태익(Tae-Ik Kim),정동근(Dong-Keun Jung) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.6
We have developed the quality analysis system for magnetic field effect of cathode-ray tube that is used a monitor, TV, medical appliance. We designed, constructed the large 3-axis square coil (2 m length) system for the generation of 3-component magnetic field using power supply, magnetometer, computer below 0.2 mT range. The coil constant is 30.31 μT, 29.73 μT, 30.51 μT for the X, Y,, Z axis square coil respectively. The magnetic field resolution was 0.01 T. The uniformity of magnetic field was measured within 1 % in the range of 12 ㎝.