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제약 프로그래밍과 메타휴리스틱을 활용한 차량 일정계획 시스템 개발에 관한 연구
김용환,장용성,유환주 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.- No.1(2)
Constraint Programming is an appealing technology for modeling and solving various real-world problems, and metaheuristic is the most successful technique available for solving large real-world vehicle routing problems. Constraint Programming and metaheuristic are complementary to each other. This paper describes how iterative improvement techniques can be used in a Constraint Programming framework(ILOG Solver and ILOG Dispatcher) for Vehicle Routing Problem. As local search gets trapped in local solution, the improvement techniques are used in conjunction with metaheuristic method.
Poly(ρ-phenylenesulfide)와 Poly(ρ-phenylene)으로부터 제조된 탄소의 리튬 이온 2차전지 anode 재료로서의 전기화학적 특성
유덕영,이주성,박수길,변지형,류신환,정윤이 한양대학교 에너지·환경기술연구소 1998 에너지·環境技術論文集 Vol.4 No.-
Poly(p-phenylenesulfide)와 poly(p-phenylene)으로부터 제조된 탄소를 리튬이온 2차전지용 음극재료로 사용하여 전기화학적특성을 연구하였다. 이들 고분자들을 질소 분위기하에서 승온속도 2℃/min로 1000℃까지 상승시킨 후, 1시간 동안 탄화시켜 탄소를 제조하였다. Poly(p-phenylene)으로부터 제조된 탄소가 보다 더 규칙적인 구조를 가지기 때문에 Poly(p-phenylenesulfide)으로부터 제조된 탄소보다 더 많은 용량과 충방전 효율을 나타내었다. 수산화리튬과 염화주석(Ⅱ)을 첨가하여 용량의 증가와 충방전 효율의 증가를 가져올 수 있었다. 이중에서 poly(p-phenylene)에 염화주석(Ⅱ)을 첨가시켜 제조된 탄소가 가장 큰 충방전 용량과 충방전 효율의 향상을 가져왔다. Carbon inaterials manufactured from poly(p-phenylene sulfide) and poly(p-phenylene), were studied on electrochemical characteristics as anode materials for lithium ion secondary battery. These polymer precursors were heat treated for 1hr at 1000℃ with the rate 2℃/min under nitrogen atmosphere. Carbon manufactured from poly(p-phenylene) showed higher capacity and coulomb efficiency of charge/discharge than carbon from poly(p-phenylene sulfide) because the former has better ordered structure. Carbon manufactured from polymer precursors adding stannous chloride or lithium hydroxide showed higher capacity and better efficiency of charge/discharge. Also, carbon manufactured by adding stannous chloride to poly(p-phenylene) showed the highest capacity and efficiency of charge/discharge.
The risk of psoriasis in patients with allergic diseases: a nationwide population-based cohort study
( Ju Hee Han ),( Chul Hwan Bang ),( Joon Ho Son ),( Hwa Jung Yook ),( Kyungdo Han ),( Jae Yeon Ryu ),( Jun Young Lee ),( Young Min Park ),( Ji Hyun Lee ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The spectrum of allergic diseases includes atopic dermatitis (AD), allergic rhinitis (AR), and asthma. To date, the association between allergic diseases and psoriasis has not been evaluated. Objectives: This study was conducted to determine the risk of psoriasis in patients with allergic diseases. Methods: This was a nationwide population-based cohort study in which data of 9,718,722 subjects ≥20 years of age were analyzed. Results: The incidence of psoriasis per 1,000 person-years was 9.57, 3.78, and 4.28 in the AD, AR, and asthma groups, respectively. The AD group exhibited a significantly increased risk of developing psoriasis (hazard ratio [HR], 3.18; 95% confidence interval [95% CI], 3.05-3.31) (P<0.001) after adjustment for confounding factors. The risk of psoriasis was significantly increased in the AR group (HR, 1.32; 95% CI, 1.31-1.34) (P<0.001) and asthma group (HR, 1.30; 95% CI, 1.27-1.33) (P<0.001). The risk of developing psoriasis tended to increase with the number of accompanying allergic diseases. In the presence of all three allergic diseases, the HR of psoriasis was 3.16 (95% CI, 2.70-3.69) (P<0.001). Conclusion: Allergic diseases, particularly AD, may be a risk factor for psoriasis.
( Ju Hee Han ),( Jae Woong Yoon ),( Jin Woo Park ),( Jae Yeon Ryu ),( Chul Hwan Bang ),( Jun Young Lee ),( Young Min Park ),( Suk Jun Lee ),( Ji Hyun Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Atopic dermatitis (AD) is a common, chronic inflammatory skin disorder which is known to be related with epidermal barrier function impairment and abnormal skin immune response. According to previous studies, increased risk of infectious disorder in AD is related with impaired epidermal function, abnormal systemic immune function and lower anti-microbial peptides. Objectives: The aim of our study was to identify the relationship between AD and infectious skin disorders in the reality through a population-based study using sequential pattern mining (SPM). Methods: We obtained population-based data recorded from 2011 to 2013 by the Health Insurance Research and Assessment Agency. SPM was used to identify the comorbidities and to measure the time onset of the comorbidities. Results: Patients with AD had a higher comorbidity of dermatophytosis, molluscum contagiosum, impetigo. AD patients were at higher risk for molluscum contagiosum (adjusted odds ratio (aOR) 5.273), impetigo (aOR 2.852), chicken pox (aOR 2.251), otitis media (aOR 1.748), eczema herpeticum (aOR 1.292) and viral wart (aOR 1.105). Conclusion: Our study demonstrates that AD could increase the risk of infectious disorders and that it might be meaningful for early diagnosis and also for management. In particular, care should be taken because of its high relevance with impetigo, molluscum contagiosum and otitis media which may help AD patients from worsening by preventing and managing them appropriately.
Shape and Contact Force Estimation of Inserted Flexible Medical device
Hwan-Taek Ryu,Jaehong Woo,소병록,Byung-Ju Yi 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.1
Flexible devices such as colonoscopy tube or catheter being inserted into the human-body make contact with the human tissues at several locations. Excessive contact force may damage the human tissues. To cope with this problem, the first aim of this paper is the shape estimation of the flexible body inside the human body using only two electromagnetic sensors. For this, the flexible body is modeled as kinematically redundant manipulator with many joints and links. The second aim is to estimate contact forces at a point, line contact, and multiple points. Cosserat-rod theory is employed to solve this problem. The effectiveness of the proposed algorithms is proved through both experiment and simulation for a flexible colonoscopy tube.