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동적 분산병렬 하둡시스템 및 분산추론기에 응용한 서버가상화 빅데이터 플랫폼
송동호,신지애,인연진,이완곤,이강세,Song, Dong Ho,Shin, Ji Ae,In, Yean Jin,Lee, Wan Gon,Lee, Kang Se 한국데이터정보과학회 2015 한국데이터정보과학회지 Vol.26 No.5
시멘틱 웹 기술인 RDF 트리플로 표현된 지식을 추론 과정을 거치면 새로운 트리플들이 생성되어 나온다. 초기 입력된 수억개의 트리플로 구성된 빅데이터와 추가로 생성된 트리플 데이터를 바탕으로 질의응답과 같은 다양한 응용시스템이 만들어 진다. 이 추론기가 수행되는 과정에서 더 많은 컴퓨팅 리소스가 필요해 진다. 이 추가 컴퓨팅 리소스는 하부 클라우드 컴퓨팅의 리소스 풀로부터 공급받아 수행시간을 줄일 수 있다. 본 연구에서는 하둡을 이용하는 환경에서 지식의 크기에 따라 런타임에 동적으로 서버 컴퓨팅 노드를 증감 시키는 방법을 연구하였다. 상부는 응용계층이며, 중간부는 트리플들에 대한 분산병렬추론과 하부는 탄력적 하둡시스템 및 가상화 서버로 구성되는 계층적 모델을 제시한다. 이 시스템의 알고리즘과 시험성능의 결과를 분석한다. 하둡 상에 기 개발된 풍부한 응용소프트웨어들은 이 탄력적 하둡 시스템 상에서 수정 없이 보다 빨리 수행될 수 있는 장점이 있다. Inference process generates additional triples from knowledge represented in RDF triples of semantic web technology. Tens of million of triples as an initial big data and the additionally inferred triples become a knowledge base for applications such as QA(question&answer) system. The inference engine requires more computing resources to process the triples generated while inferencing. The additional computing resources supplied by underlying resource pool in cloud computing can shorten the execution time. This paper addresses an algorithm to allocate the number of computing nodes "elastically" at runtime on Hadoop, depending on the size of knowledge data fed. The model proposed in this paper is composed of the layered architecture: the top layer for applications, the middle layer for distributed parallel inference engine to process the triples, and lower layer for elastic Hadoop and server visualization. System algorithms and test data are analyzed and discussed in this paper. The model hast the benefit that rich legacy Hadoop applications can be run faster on this system without any modification.
송동호(Dong-Ho Song),하은혜(Eun-Hye Ha),오욱진(Wook-Jin Oh),고광범(Kwang-Bum Ko),류영민(Young-Min Lew) 대한소아청소년정신의학회 2008 소아청소년정신의학 Vol.19 No.3
Objectives: This study aimed to evaluate preliminarily the clinical effects of cognitive-behavioral treatment in children with anxiety disorders. Methods: Subjects were 11 children between 2nd and 6th grade with anxiety disorder. All subjects were diagnosed through Kiddie-Schedule for Affective Disorder and Schizophrenia Present and Lifetime Version (K-SADS-PL) interview. The CBT program consisted of sessions once a week (60min/session) for 14 weeks with parent education. Results: Children and parents reported significantly improved social skills, social competence and decreased anxiety. However, there were no significant changes in childrens negative thoughts and subjective depressive symptoms. Conclusion: Cognitive-behavioral treatment is expected to be effective in children with anxiety disorders such as generalized anxiety disorder, phobia, separation anxiety disorder, and obsessive-compulsive disorder.
오줌 유래 Trypsin 억제제가 출혈성쇼크에 미치는 영향
송동호(Dong Ho Song),조명행(Myung Haing Cho),김종민(Jong Min Kim),권오경(Oh Kyeong Kweon),이희천(Hee Chon Lee),정언승(Eon Seung Chung),양한석(Han Seok Yang),변종환(Jong Hwan Byun) 한국응용약물학회 1997 Biomolecules & Therapeutics(구 응용약물학회지) Vol.5 No.3
The protective effect of human urinary trypsin inhibitor(LTI) on acute hemorrhagic shock in beagle dog was studied. Hemorrhagic shock was experimentally induced in thoracotomized beagle dogs by removing blood and maintaining low arterial blood pressure for 30 min, and then blood removed was entirely transfused back into the dogs within one hour. When the blood was transfused, UTI was administered together to check the potential protective effect of UTI on hemorrhagic shock. The arterial blood pressure recovery was accelerated slightly by UTI treatment. Blood pH and P_aco₂ returned to normal level in shorter time in the UTI treatment group. These data suggest that UTI may have protective effects on experimentally induced hemorrhagic shock.
군 위성통신망에서의 호 연결 소요시간 및 성공률에 대한 연구
송동호(Dong-Ho Song),이태훈(Tae-Hoon Lee),조병각(Byung-Gak Jo) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.10
This paper proposes the multiple accesses channel structure for call connection requests of 2000 subscribers in the next generation military satellite communications network. That is consisted of 16 access channels for call connection requests based on eight 100ms slots by each channel and has the Slotted ALOHA slot structure composed of total 128 Slots. Applying this scheme, the call connection time up to 10 seconds and call success ratio of 2000 satellite communications terminals over 99% can be supplied in case of not only the normal situation call pattern but also the war situation one. We analyze the performance of the proposed scheme through simulations and show that it is a reliable multiple accesses channel structure for call connection requests available to the next generation satellite communications network. Also, limiting the number times of re-transmission to authenticate as a call success, we suggest that the call connection time against call success ratio could be traded off.