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다중스레드 구조에서 병렬 객체지향 계산을 위한 효과적인 실행시간 모델
송종훈(Jonghoon Song),김흥환(Heunghwan Kim),한상영(Sangyong Han) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.11
객체지향 기법은, 사용자가 각 객체를 병렬로 실행되는 메시지 전달 장치로 다룰 수 있는 환경을 제공하기 때문에, 병렬 및 분산시스템에서 효과적으로 이용될 수 있는 패러다임이다. 그러나, 다중스레드 구조에 기초한 객체지향 환경은 빈번한 프레임의 할당 요청으로 인해서, 다른 계산 환경에 비해 메시지 교환량에 따른 오버헤드가 크다. 본 논문에서는 다중스레드 구조에 기반을 두고 있는 객체 지향 시스템 OOId/DAVRID에서 객체지향 계산의 성능을 향상시킬 수 있는 실행시간 모델을 제안한다. 이 모델은 클래스 상속을 효과적으로 지원하며, 메시지 오버헤드를 줄이기 위해서 기존의 객체 프레임 할당과 멤버 함수 호출을 개선하였으며, 변경 가능한(mutable) 멤버를 효과적으로 접근하도록 하였다. 성능분석의 결과는 제안된 모델이 기존의 모델보다 성능이 우수함을 보여준다. 그리고, 그 성능 향상의 정도는 많은 객체가 동적으로 생성되어 객체 관련 메시지가 빈번한 응용에서 더 크게 나타남을 확인할 수 있었다. The object-oriented paradigm is ideal for parallel and distributed systems, because users can naturally treat an object as the message-passing unit which is executed concurrently. But, in the object-oriented environment based on multithreaded architecture, the message traffic is heavier than in other environments because of the frequent requests for frame allocation We suggest a runtime model on object-oriented system OOId/DAVRID, which can improve the performance of object-oriented computing in multithreaded architecture. This model supports class inheritance efficiently and improves the object frame allocation and member function call to reduce the message overhead. It also allows efficient access to the mutable member. The simulation results show that the proposed model is superior to a previous model in performance and the performance gain is larger in the application where many objects are dynamically created.
송종훈(Jong-Hoon Song),장향인(Hyang-In Jang),정학근(Hak-Geun Jeong),서승직(Seung-Jik Suh) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
It is shown that the optical performance of window has a large effect on the amount of energy consumed in a building. However, the amount of energy consumed will change, in case the performance of window isn"t maintained. Therefore, the performance of window due to external pollutants was measured by using Window Energy Profiler. The change of performance was analyzed in the measurement results, and the amount of energy consumed in a building was compared and analyzed by using energy analysis program on the basis of the analyzed results.
송종훈(Jong Hoon Song),홍성화(Sung Wha Hong),동석호(Seok Ho Dong),김효종(Hyo Jong Kim),장영운(Young Woon Chang),이정일(Joung Il Lee),장린(Rin Chang),이주희(Ju Hie Lee) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.6
An association between the use of oral contraceptives and the development of benign dis- ease of the liver was first suggested by Baum et al. Since then there have been many reports of such an association and there is now firm evidence that the use of oral contraceptives in- creases the incidence of benign liver tumors and particularly of hepatocellular adenoma. But, a definite relationship between the oral contraceptive use and malignant liver tumors has not been established. Since the mid-1970s, there have been many reports of hepatocellular carcino- ma in young women using oral contraceptives. Several abnormal characteristics associated with the pathology and natural history of hepatocellular carcinoma in young users of oral con- traceptives have also been noted. The tumors usually occur in non-cirrhotic livers without raised alpha fetoprotein concentration. This evidence, together with the occasional reports of malignancy progressing from benign adenoma, which is certainly associated with the use of oral contraceptives, suggests that there could be a specific group of liver carcinomas related to oral contraceptives. Hepatocellular adenoma associated with the use of oral contraceptives had been reported in Korea, but hepatocellular carcinoma associated the use of oral contraceptives had not been reported. We experienced a case of hepatocellular carcinoma without liver cirrho- sis, markers of hepatitis infection, excess alcohol consumption, or known hepatotoxins, and it was confirrned by operation and histologic examination.(Korean J Gastroenterol 1994; 26: 1041 1047)
다중스레드 계산 모델을 이용한 병렬 객체지향 프로그래밍 환경의 구현 및 성능 평가
송종훈(Jonghoon Song),김흥환(Heungwan Kim),한상영(Sangyong Han) 한국정보과학회 1999 정보과학회 컴퓨팅의 실제 논문지 Vol.5 No.6
본 논문에서 제안하는 시스템은 일반적인 병렬 시스템의 하드웨어 구조에서, 다중 스레드 계산 모델을 이용하여 객체 지향 프로그래밍 환경을 구현한 시스템이다. 제안하는 시스템을 효과적으로 구현하기 위하여 컴파일러와 실행 시간 시스템의 측면에서 여러 가지 기법을 제시한다. 컴파일러의 측면에서는 멤버 변수의 접근 분석, 메소드의 병렬성 분석 기법을 제시하고, 실행 시간 시스템에서는 실시간 스레드/메시지 결합, 프레임 공유 기법을 제시한다. 본 논문에서 제안된 프로그래밍 환경은, MPI 메시지 인터페이스를 이용하여 구현하였으며, 벤치마크 프로그램을 실행함으로써 성능 분석을 하였다. 분석의 결과는 실행시간 시스템의 여러 가지 기법들이 성능 향상에 많은 효과가 있음을 보여주며, 이러한 결과는 일반적인 병렬 시스템에서도 적용 가능하다. In this paper, we suggest an object-oriented programming environment with multithreaded computation model on general parallel processing systems. We developed many methods for our environment to be efficient. in complier, the analysis of member variable and method parallelism, and in runtime system, thread/message merging and frame sharing. The programming environment is implemented with MPI message interlace, and its performance is analyzed with executing benchmark programs. The results show that the developed methods have influence on performance improvement, and this improvement can be applied to general parallel processing systems.
송종훈(Jong Hoon Song),홍성화(Sung Wha Hong),동석호(Seok Ho Dong),김효종(Hyo Jong Kim),김병호(Byung Ho Kim),장영운(Young Woon Chang),이정일(Joung Il Lee),장린(Rin Chang),이주희(Ju Hie Lee) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.6
Focal nodular hyperplasia is a benign epithelial tumor of the liver, occuring on noncirrhotic liver. It occurs usually in productive age women, but it is not associated with oral contraceptive use. We should differnentiate it from hepatocellular adenoma or hepatocellular carcinoma, histologically. Focal nodualr hyperplasia had not been reported in Korea. We experienced a case of focal nodular hyperplasia without liver cirrhosis of 23 years old woman. And it was con- firmed by operation and histologic examination. (Koren J Gastroonterol 1994; 26: 1034 1040)
송종훈(Jong Hoon Song),김도헌(Do Hern Kim),허준(Jun Hur),전욱(Wook Chun),김종현(Jong Hyun Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.1
Purpose: The most common cause of death in massive burn patients is burn wound sepsis. Therefore we have been using allograft skin for preventing burn wound sepsis. Methods: Included in this study were 71 subjects who had sustained extensive burns from December 2003 through February 2006. 1. Early selective Escharectomy was performed for full thickness burn areas. 2. Allograft skins were grafted on excision area. 3. An autograft was performed for areas with a formation of granulation tissue after the allograft skin had come away. 4. A modified sandwich grafting technique (1:4∼6 meshed autograft with Cultured Epithelial Autografts) was performed in large sized burns. 5. Acellular dermal substitute was concurrently used to prevent burn scar contraction on joint areas. Results: Seventy one subjects were included (Fresh allograft: 9 cases, Cryo-preserved allograft: 42 cases, Glycerol preserved allograft: 20 cases). The average burn area was 41.8 (20∼92) %TBSA (Total Body Surface Area). The mean area of the allograft skin used was 26.9 (8∼70) %TBSA. The grafted allograft skins usually came away 3 weeks later. Four cases of initial take failure were occurred. All of these cases were pediatric patients using cadaver skin. Nine patients were dead from heart failure, severe inhalation, respiratory failure, pneumonia in old age, renal failure etc. There was no definite wound sepsis. Cultured Epithelial Autografts (CEAs) were used in fourteen cases. In twentyfive cases, acellular dermal substitute was simultaneously used. Conclusion: Early selective escharectomy, allograft skin coverage, acellular dermal substitutes and wide meshed autograft with CEA application would be immensely helpful techniques in patients with extensive burns.
송종훈(Jong Hoon Song),동석호(Seok Ho Dong),김효종(Hyo Jong Kim),김병호(Byoung Ho Kim),장영운(Young Woon Chang),이정일(Jeong Il Lee),장린(Rin Chang),홍성화(Sung Wha Hong),이주희(Ju Hie Lee) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.4
Focal nodular hyperplasia is a benign epithelial tumor of the liver, occuring on noncirrhotic liver. It occurs usually in productive age women, but it is not associated with oral contraceptive use. We should differnentiate it from hepatocellular had not been reported in Korea. We experienced a case of focal nodular hyperplasia without liver cirrhosis of 23 years old woman, and it was confirmed by operation and histologic examination. (Korean J Gastroonterol 1994; 26 : 1034-1040)
송종훈(Jong Hoon Song),홍기환(Ki Hwan Hong),홍용태(Yong Tae Hong),김은지(Eun Ji Kim) 대한두경부종양학회 2017 대한두경부 종양학회지 Vol.33 No.2
Bronchogenic cysts are congenital malformations of the bronchial tree, a type of bronchopulmonary foregut malformation. The presentation of the bronchogenic cyst is variable, making pre-operative diagnosis difficult. They aremostly asymptomatic orarefound incidentally when the chest is imaged. They can present as lower neck massesor mediastinal masses that may enlarge. They cause mass effect due to local compression and may result in tracheobronchial obstruction leading to air trapping and respiratory distress. The treatment is somewhat controversial, and in general,these lesions are treated using the transcervical or transbronchial approach. When these cysts arelocalized in the upper mediastinum, it may be possible to removethemusing the transcervical approach. In our three cases, the patientscomplained of mild dysphagia, foreign body sensation, and dyspnea. We report three cases of a large bronchogenic cyst in the lower neck and the upper mediastinum treated using the transcervical approach.