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가돌리늄 조영증강 자기공명영상과 확산강조영상의 간신경내분비종양진단능력에 대한 비교연구
장석기 ( Suk Ki Jang ),김정훈 ( Jung Hoon Kim ),유미혜 ( Mi Hye Yu ),한준구 ( Joon Koo Han ) 대한간암학회 2016 대한간암학회지 Vol.16 No.2
Background/Aims: To investigate the diagnostic performance of diffusion-weighted imaging (DWI) for hepatic neuroendocrine tumors (NET) compared with combined DWI and contrastenhanced magnetic resonance imaging (MRI) . Methods: Fifteen patients with hepatic NET (n=128) underwent enhanced MRI and DWI with multiple-b values. We analyzed three different sets: Precontrast set; DWI set (added DWI); combined set (added enhanced image). Two reviewers rated possibility of NET using a 5-point scale for each image set. Their diagnostic performance was compared using Jackknife alternative free-response ROC (JAFROC). Results: Diagnostic performance was better on the combined set (figure of merit [FOM]=0.852, 0.761) than the precontrast set (FOM=0.427, 0.572, P<0.05) and the DWI set (FOM=0.682, 0.620, P<0.05). However, DWI improved performance compared with precontrast set without statistical difference. In small NETs (<1 cm), all sets showed low sensitivity (10.7-65.9%) with high specificity (95.4-100%). Interobserver agreement was moderate in all image sets (k=0.521 to 0.589). Conclusions: Combined DWI and enhanced MRI were more useful for detecting NET. Although statistically insignficant, there was a trend in improved diagnostic performance with DWI. (J Liver Cancer 2016;16:92-100)
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내장산 국립공원 고등균류의 자원이용적 특성에 따른 발생
김종영 ( Chong-young Kim ),장석기 ( Seog-ki Jang ),김미숙 ( Mi-suk Kim ) 한국균학회 2017 韓國菌學會誌 Vol.45 No.4
내장산 국립공원을 2004년~2011년 및 2013년까지 고등균류를 조사한 결과, 총 2문 7강 21목 74과 229속 521종이 조사되었으며, 이중 주름버섯목(Agaricales) 24과 99속 260종, 그물버섯목(Boletales) 10과 30속 59종, 무당버섯목(Russulales) 5과 8속 53종 및 구멍장이버섯목(Polyporales) 5과 33속 48종 등 4목이 전체 종수의 80.6%(420종)를 차지하고 있었다. 가장 많은 종이 포함된 분류군은 그물버섯과와 무당버섯과로 44종이었으며, 주름버섯과(35종), 구멍장이버섯과(29종) 및 광대버섯과(27종)의 순으로 출현 종의 수가 많았다. 이를 다시 서식환경 별로 세분해 보면, 외생균근성버섯은 21과 44속 192종(36.9%)이 분류되었는데 이중 독성 버섯 63종, 식· 약용 버섯 79종, 식· 독 불명 버섯 43종이었고, 목재 및 낙엽부후균은 41과 118속 199종(38.2%)으로 이중 독성 버섯 14종, 식· 약용 버섯 85종, 식· 독 불명 버섯 90종이었으며, 지상균은 29과 66속 121종(23.2%)으로 독성 버섯 8종, 식· 약용 버섯 54종, 식· 독 불명버섯 47종 등으로 각각 조사되었다. 9종은 위의 그룹에 해당되지 않는 서식처를 갖고 있었다. 대부분의 독성 버섯, 식· 약용 버섯 및 식 · 독 불명 버섯은 7월~9월 사이에 집중하였고, 해발 고도에서는 200~299 m인 지역에서 발생이 매우 높았으며 700 m이상 지역에서는 발생이 현저하게 낮은 것으로 나타났다. 기후환경 요인별에서는 평균기온 25.0~28.9°C(최고기온 30.0~33.9°C, 최저기온 21.0~24.9°C), 상대습도 73.0~80.9% 및 강수량 400.0 mm 이상일 때 대부분의 버섯류의 발생이 높은 것으로 나타났다. In a survey on higher fungi from 2004 to 2011, and also in 2013, in Naejangsan National Park, a total of 2 divisions, 7 classes, 21 orders, 74 families, 229 genera, and 521 species were observed. Dominant species belonged to the families Boletaceae and Russulaceae (44 species), Agaricaceae (35 species), Polyporaceae (29 species), and Amanitaceae (27 species). For the habitat environment, 21 families, 44 genera, and 192 species (36.9%) (63 species of poisonous mushroom, 79 species of edible and medicinal mushroom, and 43 species of unknown edible & poisonous mushroom) of ectomycorrhizal mushrooms were found; 41 families, 118 genera, and 199 species (38.2%) (14 species of poisonous mushroom, 85 species of edible & medicinal mushroom, and 90 species of unknown edible and poisonous mushroom) of litter decomposing and wood rotting fungi were found, and 29 families, 66 genera, and 121 species (23.2%) (8 species of poisonous mushroom, 54 species of edible and medicinal mushroom, and 47 species of unknown edible & poisonous mushroom) of grounding fungi were found, and 9 species were the other habitat. In terms of seasonality, most of the higher fungi were found in July, August, and September. In terms of altitude, the most species were observed at 200~299 m, and populations dropped by a significant level at an altitude of 700 m or higher. It seemed that the most diversified higher fungi occurred at climate conditions with a mean air temperature of 25.0~28.9°C, a maximum air temperature of 30.0~33.9°C, a minimum air temperature of 21.0~24.9°C, a relative humidity of 73.0~79.9%, and over 400.0 mm of rainfall.
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AAL2를 이용한 패킷기반 중계망에서의 호 허락/이탈 제어 알고리즘
장석기,김훈,박광채 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
The tandem network composed of the existing circuits network and packets network will integrate into a single network after this. that is, the circuit-based services of PSTN/ NISDN will integrate into the packet-based tandem network by using the devices of Media Gateway etc. moreover, because it is possible to multiplex the connections assigned to each subscriber by using AAL2 switching function of ATM network, we can heighten the utilization efficiency of network. In this paper, we described the VoDSL using an ATM tandem network and the call admission/ departure control algorithm, and appeared the performance estimation for the numerical results of multiplexer with bit dropping.
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장석기,김홍렬 木浦海洋大學校 1997 論文集 Vol.5 No.1
A fast peak detector for three-phase sinusoidal signals is proposed. This new detector fully used the three phase characteristic to achieve instantaneous response and frequency independence characteristics. Also, the proposed detector possesses excellent linearity. Theoretical basis, hard-ware implementation, and experimental results are all detailed in this paper.
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