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Torus Ring : 계층 링 구조의 변형을 통한 상호 연결망의 성능 개선
곽종욱(Jong Wook Kwak),반형진(Hyong Jin Ban),전주식(Chu Shik Jhon) 한국정보과학회 2005 정보과학회논문지 : 시스템 및 이론 Vol.32 No.5·6
다중 프로세서 시스템에서 노드 간의 연결을 제공하는 상호 연결망이 전체 시스템의 성능에서 차지하는 비중은 매우 크다. 상호 연결망의 형태는 여러 종류가 있을 수 있으나 Mesh, 링, 계층 링 등의 형태가 많이 사용된다. 이 논문에서는 기존의 계층 링을 수정한 Torus Ring을 제안한다. Torus Ring은 계층 링과 완전히 동일한 복잡도를 가지면서도 지역 링 간의 연결 방법만을 변경한 형태의 상호 연결망이다. 이 연결망은 역방향 인접 링에 대한 요청에서 홉 수의 이득을 봄으로써 평균 홉 수를 감소시킨다. 또한 접근의 지역성을 고려하지 않은 균등분포의 가정 하에서도 평균 홉수의 기대값에서 계층링과 동일한 값을 가지며, 실제 병렬 프로그램이 수행되는 환경에서는 인접링에 대한 통신 비율이 증가할 가능성이 크기 때문에 더 큰 홉수의 이익을 기대할 수 있다. 이에 다라 상호 연결망의 요청과 응답의 지연 시간이 최대 19%까지 감소하였으며, 이러한 응답 지연 시간의 단축이 수행 시간을 최대 10% 저?가지 감소시키는 결과를 가져왔다. In multiprocessor systems, interconnection network design is critical for overall system performance. Popular interconnection networks, which are generally considered, are meshes, rings, and hierarchical rings. In this paper, we propose “Torus Ring”, which is a modified version of hierarchical ring. Torus Ring has the same complexity as the hierarchical rings, but the only difference is the way it connects the local rings. It has an advantage over the hierarchical rings when the destination of a packet is the neighbor local ring in the reverse direction. Though the average number of hops in Torus Ring is equal to that of the hierarchical rings when assuming the uniform distribution of each transaction, the benefits of the number of hops are expected to be larger because of the spatial locality in the real environment of parallel programming. In the simulation results, latencies in the interconnection network are reduced by up to 19%, and the execution times are reduced by up to 10%.
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Solitary schwannoma of the ascending colon
Chu, Myeong Su,Kang, Hyun Mo,Sun, Hyeong Ju,Kim, Dong Min,Kwak, Hyong Jong Yeungnam University College of Medicine 2016 Yeungnam University Journal of Medicine Vol.33 No.1
Schwannomas are uncommon neoplasms arising from Schwann cells of the neural sheath. Gastrointestinal schwannomas are rare, accounting for 1% of all malignant gastrointestinal tumors. Colonoscopic biopsy with immunohistochemical (IHC) staining is useful for confirming this tumor. We report on a patient with schwannoma arising from the ascending colon, which was detected by colonoscopy and endoscopic submucosal dissection was attempted. A 41-year-old man presented with abdominal discomfort. The patient was diagnosed with a subepithelial tumor on colonoscopy. He underwent endoscopic submucosal dissection. Histopathology and IHC staining confirmed that the colonic lesion was a benign schwannoma. However, the resection margin was positive. Therefore, laparoscopic ileocolectomy was performed.
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Solitary schwannoma of the ascending colon
( Myeong Su Chu ),( Hyun Mo Kang ),( Hyeong Ju Sun ),( Dong Min Kim ),( Hyong Jong Kwak ) 영남대학교 의과대학 2016 Yeungnam University Journal of Medicine Vol.33 No.1
Schwannomas are uncommon neoplasms arising from Schwann cells of the neural sheath. Gastrointestinal schwannomas are rare, accounting for 1% of all malignant gastrointestinal tumors. Colonoscopic biopsy with immunohistochemical (IHC) staining is useful for confirming this tumor. We report on a patient with schwannoma arising from the ascending colon, which was detected by colonoscopy and endoscopic submucosal dissection was attempted. A 41-year-old man presented with abdominal discomfort. The patient was diagnosed with a subepithelial tumor on colonoscopy. He underwent endoscopic submucosal dissection. Histopathology and IHC staining confirmed that the colonic lesion was a benign schwannoma. However, the resection margin was positive. Therefore, laparoscopic ileocolectomy was performed.
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모성 및 사회성 분리 백서 모델의 해마에서 유전자 칩을 이용한 유전자 발현 연구
이희제,손창희,곽형렬,이상현,한윤희,김수영,박종익,전완주,김성수,Lee, Hee Jae,Son, Chang Hee,Kwak, Hyong Ryol,Lee, Sang-Hyun,Han, Yoon Hee,Kim, Soo Young,Park, Jong-Ik,Chun, Wanjoo,Kim, Sung-Soo 대한생물정신의학회 2006 생물정신의학 Vol.13 No.2
Objectives : Alteration of hippocampus was demonstrated in the maternal social separation(MSS) pups, separated from dams on postnatal day(pnd) 14 and placed alone. Therefore, to understand the molecular events involved in the MSS, we have initiated a search for gene profiles that are up or down-regulated in the hippocampus of MSS pups. Methods : Analysis of cDNA microarray was performed by using total RNA extracted from the hippocampus of control and MSS pups on pnd 17. Also, passive-avoidance test was demonstrated on pnd 35. Results : Up-regulation of Nedd4a was observed in the hippocampus of MSS pups. Also, MSS rats showed less elongation of latency in passive avoidance test. Conclusion : We suggest that environmental effects of MSS may be altered the neural and/or glial differentiation and synapse formation-related genes which may lead cognitive alterations in MSS rats.
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