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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%).
우렁쉥이 Halocynthia roretzi 근육중 IMP의 분포확인 및 저장중 ATP분해생성물의 변화
박춘규,김우준,강훈이,강태중,신석우,PARK Choon-Kyu,KIM Woo-Jun,KANG Hoon-I,KANG Tae-Jung,SHIN Suk-Woo 한국수산과학회 1994 한국수산과학회지 Vol.27 No.2
우렁쉥이 Halocynthia roretzi의 사후에 근육의 ATP 분해경로를 검토하기 위하여 1989년 4월 우리나라 남해안의 충무 근해에서 양식중인 시료를 채취하여 근육의 엑스분을 조제하고 핵산관련 물질을 이온교환 크로마토그래피와 고속액체 크로마토그래피 방법으로 IMP를 동정하였으며, 또한 우렁쉥이 근육을 $0^{\circ}C$와 $20^{\circ}C$에 저장하면서 ATP 분해 생성물의 경시변화를 살펴보았다. 근육의 엑스분 중에서 IMP가 분포 확인되었다. 그리고 저장중의 일부 시료에서 Ado가 확인되었고, 모든 시료에서 IMP가 검출되어 Ado와 IMP분해 경로의 존재가 확인되었다. ATP 관련물질은 사후 저장 초기단계에서 AMP는 급격히 감소하고, Ino는 빠른 속도로 증가되었지만 Ado와 IMP는 미량으로써 큰 증감현상을 보이지 않았다. 이와 같은 변화는 우렁쉥이 근육중에 AMP deaminase 활성은 있으나 미약하여 여러 해산 무척추동물에서처럼 Ado 분해경로를 가지는 것으로 추정된다. 따라서 우렁쉥이 근육의 ATP는 해산 무척추동물 중의 새우${\cdot}$게류, 갯가재 등의 갑각류 근육에서처럼 Ado경유와 IMP경유의 양쪽 분해경로를 같이 가지고 있는 것으로 판단된다. Indentification of IMP was carried out and changes in ATP breakdown products during storage at $0^{\circ}C\;ad\;20^{\circ}C$ were investigated in the muscles of ascidian Halocynthia roretzi. For identifying IMP, the ion-exchange column chromatographic method was applied to the perchloric acid extract of the muscle of cultured ascidian collected at the southern coast near Chungmu of Korea in April 1989. The IMP of sample was eluted a little earlier than that of the reference standard, but absorption spectra of both fractions agreed each other. In addition, both fractions gave the identical retention time of HPLC. These results reconfirmed that the ascidian muscle did contain IMP, indicating that ATP was degraded through IMP breakdown pathway, such as $ATP{\to}ADP{\to}AMP{\to}IMP{\to}Ino{\to}Hyp$. Ado was detected in some samples and IMP was detected throughout the experimental periods at both temperatures, but their levels were always very low; they did not increase significantly even when the decreasing rate of AMP was very rapid and concomitant remarkable increase in Ino were observed at the early stage of storage. Those changes in ATP suggest that AMP deaminase activity was present in the ascidian muscle, though it was very low. The main breakdwon pathway of ATP was assumed to be $ATP{\to}ADP{\to}AMP{\to}Ado{\to}Ino{\to}Hyp$. In conclusion, there were two breakdown pathways of ATP in the muscle of ascidian as was the case for the muscle of many marine crustaceans.