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서상혁(Sang-Hyuk Seo),박정익(Jeong-Ik Park),김진수(Jin-Soo Kim),김광희(Kwang-Hee Kim),최창수(Chang-Soo Choi),최영길(Young-Kil Choi) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.6
Purpose: Xanthogranulomatous cholecystitis (XGC) is an uncommon, benign destructive and chronic inflammatory disease which is characterized by a marked proliferative fibrosis within the gallbladder wall. XGC occasionally involves adjacent organs and mimicking an advanced gallbladder carcinoma (GBC). The purpose of this study was to review the clinical manifestations, radiologic and pathologic findings of XGC and to investigate an appropriate treatment plan for patients with XGC. Methods: We retrospectively analyzed the clinical data of 36 patients with a pathologic diagnosis of XGC operated between January 2003 and June 2008. Results: The most frequent clinical symptom was biliary colic (88.8%). Radiologic studies revealed cholelithiasis in 30 patients (83.3%), thickening of gallbladder wall in 24 patients (66.6%), suspicious cancer in 11 patients (30.5%) and Mirizzi syndrome in 3 patients (8.3%). Laparoscopic cholecystectomy was planned in 18 patients but converted to open surgery in 9 patients. Open cholecystectomy was planned and performed in 13 patients including 8 cases of T-tube choledocholithotomy and 1 case of excision of a cholecystoduodenal fistula. Extended cholecystectomy was performed on 3 patients. GBC was suspected before operation in 11 patients. Of these, frozen-section biopsy was performed in 6 and found to be malignant in 1 patient. One patient who had no operative suspicion of malignancy turned out to have GBC at final histology. Conclusion: XGC is difficult to diagnose either preoperatively or intraoperatively and definite diagnosis can be obtained by pathologic examination only. If there is an intraoperative suspicion of GBC, frozen-section biopsy will help to decide the appropriate mode of operation.
고속 신호의 무결성 테스트를 위한 On-chip Eye-Opening Monitor 구현 및 분석
서상혁(Sang-Hyuk Seo),김수환(Suhwan Kim) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
This paper presents an On-chip Eye-Opening Monitor (EOM) circuit that supports increasing data rates such as next-generation memory. In addition, the EOM circuit was classified, and trade-off, utilization, and relative advantages according to the resolution of the 2-D EOM were analyzed through analysis and simulation. Using this, the implemented On-chip EOM can be expanded and designed in various ways depending on the purpose.
Single-Ended PAM-4 Receiver Side Equalizers For DRAM Interface 구현 및 분석
서상혁(Sang-Hyuk Seo),김수환(Suhwan Kim) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
This paper presents an Single-Ended PAM-4 Receiver Side Equalizers. As growing industry needs for high-speed DRAM over 22Gb/s/pin, continuous-time linear equalizer (CTLE) and 1-tap decision feedback equalizer (DFE) circuits support up to 28Gb/s/pin are designed. In addition, CTLE and 1-tap DFE operations are analyzed through post-simulation via the 28-nm CMOS process.
서상혁(Sang-Hyuk Seo),김우완(Wu-Wan Kim) 한국컴퓨터정보학회 2009 한국컴퓨터정보학회 학술발표논문집 Vol.16 No.2
무선네트워크 환경의 발전으로 인해 이동 중 대용량, 고속의 멀티미디어 서비스의 수요가 증가하고 있다. 이런 이동성 기술을 수용하기 위해 MIPv6가 현재까지 대표적인 표준 프로토콜 가능성을 가졌지만 이론과 구현의 괴리감으로 인한 한계와 핸드오버 지연시간으로 인한 서비스 품질을 저하로 표준화 기술로서 적합성은 힘들다는 전망이다. 최근 IETF NetLMM(Network-based Local Mobility Management) 워킹그룹에서 표준화 작업을 진행하고 있는 망 기반 이동성 제공 기법은 기존의 단말 기반 이동성 제공방식인 MIPv6(Mobile IPv6) 의 단점을 극복하기 위해 제안된 방식으로, 현재 PMIPv6(Proxy Mobile IPv6)를 워킹그룹 공식 프로토콜로 채택하고 표준화를 진행하고 있다. 본 논문에서는 이전의 표준화 기술인 KIIPv6의 단점이 무엇인지 알아보고 MIPv6의 단점을 보완한 새로운 표준 기술로 각광받고 있는 PMIPv6기술의 특징과 향후 전망에 대해 알아볼 것이다.
김동현,서상혁,이난주,전용순,Kim, Dong-Hyun,Seo, Sang-Hyuk,Lee, Nan-Joo,Chun, Yong-Soon 대한소아외과학회 2007 소아외과 Vol.13 No.2
Trauma is one of the leading causes of death in children. Abdominal trauma is about 10 % of all pediatric trauma. This study describes the sex and age distribution, injury mechanism, site of intraabdominal injury, management and mortality of children aged 16 years or less who suffered abdominal trauma. The hospital records of 63 patients treated for abdominal injury between March 1997 and February 2007 at the department of surgery, Inje University Pusan Paik Hospital, were analyzed retrospectively. The peak age of incidence was between 2 and 10 years (78%) and this report showed male predominance(2.7:1). The most common mechanism of blunt abdominal trauma was pedestrian traffic accident (49%). The most common injured organ was liver. More than Grade IV injury of liver and spleen comprised of 4(12%) and 5(24%), respectively. Fourteen cases (22%) had multiple organ injuries. Forty nine cases (78%) were managed nonoperatively. Three patients (4.8%) died, who had Grade IV liver injury, Grade IV spleen injury, and liver and spleen injury with combined inferior vena cava injury, respectively. All of the three mortality cases had operative management. In conclusion, the liver or spleen injury which was more than Grade 4 might lead to mortality in spite of operation, although many cases could be improved by nonoperative management.
Telos Device를 이용한 전방십자인대 Lachman 검사 시 무릎두 께와 활성도에 따른 인가압력에 대한 고찰
임종천 ( Jong-cheon Lim ),김상혁 ( Sang-hyuk Kim ),서상혁 ( Sang-hyuk Seo ),김연민 ( Yon-min Kim ) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.3
본 논문에서는 Telos Device를 이용한 검사 시 인가한 daN 힘의 차이와 무릎의 안정성에 관여하는 근육들의 개인차에 따른 전방십자인대의 동요 정도에 대해 연구하고자 한다. Telos Device를 이용한 Lachman Test로 검사하였으며, 오른쪽과 왼쪽을 각각 0, 15, 30 daN, 운동부하 후30 daN의 힘으로 변화하며 검사하여 전방십자인대의 변화를 측정하였다. 근육량 측정은 CT(Computed Tom ography)를 이용하였으며, 힘줄(tendon)을 피해 근육을 측정하기 위해 무릎뼈(patella) 상방 8 cm의 위치를 검사하였다. 전방십자인대(Anterior Cruciate Ligament)의 변화 정도는 Piview의 Caliper 기능을 이용하여 측정하였으며, 근육량은 CT 단면 영상을 Image J 프로그램을 이용하여 지방을 제외한 뼈와 근육의 면적을 측정하였다. 측정값들은 SPSS Ver. 18을 이용하여 결과 값을 얻었다. Telos Device 로 인가하는 힘의 변화에 따라 전방십자인대의 동요 정도를 측정한 결과 오른쪽과 왼쪽 모두 15 daN 과 30 daN의 힘을 인가하였을 때 통계적으로 유의한 무릎 동요의 차가 발생하였으며(p< 0.05), 30 daN 과 운동부하 후 30 daN 에서의 동요 정도는 유의한 차이를 보이지 않았다(p >0.05). 근육면적의 차이와 전방십자인대의 동요 정도와의 상관관계에서 15 daN의 압력에서 오른쪽 r=-0.45, 왼쪽 r=0.44로 음의 상관관계를 보였다(p<0.05). Telos Device에 인가하는 힘의 정도에 따라 전방십자인대의 동요는 커지는 것으로 분석되며, 또한 개인의 근육량의 차이에 따라 전방십자인대의 동요 정도에도 차이를 보이는 것으로 분석된다. 따라서 개인의 근육량의 차이에 따라 Telos Device에 인가되는 힘도 변화되어야 하는 것으로 사료된다. The purpose of study is to investigate the difference of the daN force applied during the examination using Telos Device and the degree of fluctuation of anterior cruciate ligament according to the individual differences of the muscles involved in knee stability. The examination was done by the Lachman test using Telos Device and the changes of anterior cruciate ligament were measured by varying the force of 0. 15, 30 daN on each right and left side and the force of 30 daN after the bruce protocol. Computed tomography(CT) was used to measure muscle mass. As a result of measuring the degree of fluctuation of the anterior cruciate ligament according to the change of the force applied to the Telos Device, there was a statistically significant difference in the knee fluctuation when 15 daN and 30 daN were applied on both right and left. Also, it is analyzed that the degree of fluctuation of anterior cruciate ligament varies according to the difference of individual's muscle mass. Therefore, it is considered that the force applied to the Telos Device should be changed according to the difference of individual's muscle mass.