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온톨로지 기반의 상황정보관리에서 추론 성능 향상을 위한 어플리케이션 지향적 상황정보 선인출 기법
이재호(Jaeho Lee),박인석(Insuk Park),이동만(Dongman Lee),현순주(Soon Joo Hyun) 한국정보과학회 2006 정보과학회 컴퓨팅의 실제 논문지 Vol.12 No.4
유비쿼터스 컴퓨팅 환경에서 온톨로지 기반의 상황정보 모델은 추론을 통한 개념적 상황정보의 획득, 상황정보의 공유와 재사용의 이점을 제공하기 때문에 널리 사용되고 있다. 이 중에서 추론은 상황인지 어플리케이션이 센서로부터 직접 얻을 수 없는 개념적 상황정보를 이용할 수 있도록 해준다. 하지만 추론의 경우, 그 처리 시간이 대상이 되는 상황정보의 크기가 커질수록 증가하게 되며, 이때 야기되는 시간 지연은 상황인지 어플리케이션의 실제적인 동작을 방해한다. 본 논문에서는, 추론 속도를 향상시키기 위해 작업 메모리에서 처리 되는 상황정보의 크기를 줄이는 상황정보 선인출 기법을 제안한다. 우리는 상황인지 어플리케이션의 질의와 관련이 있는 상황정보를 결정하기 위해 기존의 쿼리트리를 이용한 방법을 확장한다. 제안한 기법을 이용하여 선인출된 상황정보만 작업 메모리에 유지함으로써, 온톨로지 기반의 상황정보가 제공하는 이점을 유지하면서 추론에 의해 야기되는 시간 지연을 줄일 수 있다. 우리는 제안한 기법을 기존의 유비쿼터스 컴퓨팅 미들웨어, Active Surroundings에 적용시키고 실험을 통해 성능 향상을 보였다. Ontology-based context models are widely used in ubiquitous computing environment because they have advantages in the acquisition of conceptual context through inferencing, context sharing, and context reusing. Among the benefits, inferencing enables context-aware applications to use conceptual contexts which cannot be acquired by sensors. However, inferencing causes processing delay and thus becomes the major obstacle to the implementation of context-aware applications. The delay becomes longer as the amount of contexts increases. In this paper, we propose a context pre-fetching method to reduce the size of contexts to be processed in a working memory in attempt to speed up inferencing. For this, we extend the query-tree method to identify contexts relevant to the queries of a context-aware application. Maintaining the pre-fetched contexts optimal in a working memory, the processing delay of inference reduces without the loss of the benefits of ontology-based context model. We apply the proposed scheme to our ubiquitous computing middleware, Active Surroundings, and demonstrate the performance enhancement by experiments.
유방암 환자에서 항암 치료 중 생긴 체중 변화와 재발과의 상관 관계
서광욱(Kwangwook Seo),조현진(Hyunjin Cho),안훈(Hoon An),박인석(Insuk Park),곽금희(Geumhee Gwak),양근호(Keunho Yang),배병노(Byungnoe Bae),김기환(Kihwan Kim) 대한종양외과학회 2013 Korean Journal of Clinical Oncology Vol.9 No.2
Purpose: Weight change during chemotherapy is reported to be associated with a worse prognosis in breast cancer. Our study was aimed to evaluate the relation of weight change during AC (anthracycline+cyclophosphamide) +taxanes chemotherapy and recurrence. Methods: Patients included 89 women diagnosed with breast cancer who have been treated by AC+taxenes chemotherapy regimen. The weight variation between prechemotherapy and postchemotherapy was calculated ([weight at postchemotherapy-weight at prechemotherapy]/weight at prechemotherapy×100) and categorized into either weight change (≥5%) or stable (<5%). And then, we evaluated the relation of weight change and recurrence through the radiologic image tests (positron emission tomography-computed tomography, breast sonography, mammography, bone scan, magnetic resonance imaging, abdomino-pelvic computed tomography) each group. Results: During chemotherapy, 37of total 89 patients (41.6%) presented notable weight change and 52 patients (58.4%) were not weight change. Median follow-up period was 45.1 months, 17 of total 89 patients (19.1%) presented recurrence on the radiologic image tests. Eight of 17 recurrence patients were presented notable weight change, 9 patients were not weight change. In univariate analyses, weight change was not associated with recurrence. Conclusion: In our study, weight change during AC+taxanes chemotherapy in breast cancer was not associated with recurrence. Many studies that relation of weight change and recurrence were presented various result. So, we need more clinical studies many patients included and well designed.