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박민재 ( Min-jae Park ),김광훈 ( Kwang-hoon Kim ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
워크플로우의 도입으로 인하여 다수의 기업은 업무의 효율성을 증대 시켰다. 하지만, 진정한 기업 업무의 효율성 증대는 워크플로우의 도입으로 인한 비즈니스 프로세스의 자동화뿐만 아니라 비즈니스 프로세스 설계의 최적화 및 개선이라고 판단된다. 이에 본 논문에서는 의존성 기반의 워크플로우 마이닝 기법에 관하여 제시 하며, 비즈니스 프로세스 설계의 최적화 및 개선을 위하여 어떠한 방법으로 접근해 나아가야 할지에 관하여 논한다.
다 채널 생체신호와 신경회로망을 이용한 가상환경 하에서의 임장감 분석
박민재 ( Min Jae Park ),박광석 ( Kwang Suk Park ),김현택 ( Hyun Taek Kim ) 한국감성과학회 2000 추계학술대회 Vol.2000 No.-
가상환경 하에서의 임장감을 객관적으로 계측하기 위한 방법으로 생체신호를 이용한 감성의 계측을 시도하였다. 여러 가지 가상환경 하에서 뇌파, 심전도, 호흡 등 다 채널의 생체신호를 계측하고 이때 피실험자가 느끼는 객관화된 임장감 지표들을 동시에 평가하여 이를 신경 회로망을 이용하여 분석하였다. 계측된 생체 신호를 사전 처리하여 일차적인 생체분석 지표들을 도출하고 이를 신경회로망의 입력으로 활용하였다. 임장감을 분석할 수 있도록 신경회로망을 학습시키고, 이를 이용하여서 가상환경 하에서 계측된 생체신호를 분석하여 임장감을 정량화하여 평가하였다.
실화재 실험을 이용한 시공단계에서의 일반 강도 콘크리트 폭렬로 인한 앵커 파괴 위험성
박민재(Park, Min-Jae),민정기(Min, Jeong-Ki) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.9
Explosive spalling is one of the significant considerations of concrete structures, despite the great fire resistance performance of the concrete. In general, explosive spalling of HSC (Hign Strength Concrete) was variously investigated due to the higher possibility of spalling rather than its of NSC (Normal Strength Concrete). However, in a specific condition such as higher than 4% w/c, explosive spalling of NSC can be occurred and concrete structures with NSC should be considered to preventing them. Due to several cases for spalling of NSC, the importance of investigating them was consolidated. In this study, the spalling of NSC under construction conditions was surveyed by large-scale fire tests, and the damage of concrete structures such as section loss was investigated. Due to violent spalling of NSC at early stages after heating, the cover of concrete was removed, and most of the reinforcements were exposed. These damages weakened the structural performance of concrete structures, and the temperatures of reinforcements dramatically rose. In other words, these damages can make the structures collapse. Also, connections such as anchors and splice sleeves can be failed due to section loss. For this reason, the capacities of the anchors in this study with intact section and damaged sections were investigated according to Korea Design Standard. The reduction ratios for capacities of the anchors under tension and shear were obtained.
화재에 노출된 강폴리머 조립식 바닥의 원형 스페이서 차열 설계
박민재(Park, Min Jae),민정기(Min, Jeong-Ki) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.10
Steel-Polymer prefabricated floor system that contained infilled polymers between the shallow top and bottom steel plates was developed to apply to steel structures. The thickness of the floor system mainly has a range from 25 mm to 70 mm. Despite the shallow thickness, the floor system has great structural performance, such as bending capacity, floor vibration performance. However, the fire resistance performance of the system needed to be improved to apply to actual buildings without fire-proofing materials. With the development of the polymers adding an additive, the fire resistance performance of the system was significantly improved, and studies about the structural fire behavior of the floor system were actively conducted with experimental and numerical approaches. Nevertheless, the behavior of circular spacers that had a role in enhancing out-of-plane buckling loads and ductility under large deformations and taking advantage in the manufacturing process has not been investigated. Therefore, the thermal behavior of circular spacers under fire conditions was studied with simplified numerical methods. And, with transient heat transfer analysis including nonlinear thermal properties of steel and polymers, nonlinear thermal contact conductance of the contact area between steel and polymers, the temperature changes of unheated surfaces where the spacers were installed at or not were obtained under fire conditions. Finally, the relation equation was proposed to calculate the temperature changes according to various specifications of circular spacers. Using this proposed equation, the thermal insulation design for the spacers of steel-polymer prefabricated were carried out at the end of this paper.