• Title/Summary/Keyword: Complicated Problems

Search Result 916, Processing Time 0.024 seconds

The Causes and Treatment of Complicated Chronic Insomnia (까다로운 만성불면증의 원인과 치료)

  • Lee, Sung-Hoon
    • Sleep Medicine and Psychophysiology
    • /
    • v.2 no.2
    • /
    • pp.138-145
    • /
    • 1995
  • The causes of complicated chronic insomnia are very various and interact with vicious circle. Patient with this insomnia has generally a strong fear and frustration about failing to control of sleep and a deep mistrust toward doctor. To solve this complicated problems detailed history taking and sleep questionnaires are needed with objective polysomnography. Through these procedures, doctor should clarify causes of insomnia and explain them to patient in details and kindly. This process would be very helpful to restore the mistrustful relationship between patient and doctor and reduce patient's vague fear for insomnia. In treatment of complicated chronic insomnia, it is most important for patient to understand his problems and participate in the treatment schedule actively with assurance. Also doctor should encourage patient persistently not to be drop out. Most important factor for prognosis is patient's personality. Causes of complicated chronic insomnia are like these, overdose of hypnotics and sedatives, daily drinking alcohol with hypnotics, insomnia associated depression, delayed sleep phase syndrome, sleep state misperception, marked fear for insomnia, hyperarousal at bed, insomnia associated periodic leg movement and sleep apnea, chronic hypnotic insomnia, and immature personality. And possible treatments of these insomnias were discussed.

  • PDF

A MONTE CARLO METHOD FOR SOLVING HEAT CONDUCTION PROBLEMS WITH COMPLICATED GEOMETRY

  • Shentu, Jun;Yun, Sung-Hwan;Cho, Nam-Zin
    • Nuclear Engineering and Technology
    • /
    • v.39 no.3
    • /
    • pp.207-214
    • /
    • 2007
  • A new Monte Carlo method for solving heat conduction problems is developed in this study. Differing from other Monte Carlo methods, it is a transport approximation to the heat diffusion process. The method is meshless and thus can treat problems with complicated geometry easily. To minimize the boundary effect, a scaling factor is introduced and its effect is analyzed. A set of problems, particularly the heat transfer in the fuel sphere of PBMR, is calculated by this method and the solutions are compared with those of an analytical approach.

A Study on the Extension of Fuzzy Programming Solution Method (Fuzzy 계확법의 해법일반화에 관한 연구)

  • 양태용;김현준
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.11 no.1
    • /
    • pp.36-43
    • /
    • 1986
  • In this study, the fuzzy programming is extended to handle various types of membership functions by transformation of the complicated fuzzy programming problems into the equivalent crisp linear programming problems with single objective. It is well-known that the fuzzy programming problem with linear membership functions (i.e., ramp type) can be easily transformed into a linear programming problem by introducing one dummy variable to minimize the worst unwanted deviation. However, until recently not many researches have been done to handle various general types of complicated linear membership functions which might be more realistic than ramp-or triangular-type functions. In order to handle these complicated membership functions, the goal dividing concept, which is based on the fuzzy set operation (i. e., intersection and union operations), has been prepared. The linear model obtained using the goal dividing concept is more efficient and single than the previous models [4, 8]. In addition, this result can be easily applied to any nonlinear membership functions by piecewise approximation since the membership function is continuous and monotone increasing or decreasing.

  • PDF

The Function of Computer Utilization in Educating and Researching Ocean Engineering Problems

  • Koo, Weon-Cheol;Kim, Moo-Hyun;Ryu, Sam
    • Journal of Ship and Ocean Technology
    • /
    • v.12 no.4
    • /
    • pp.1-6
    • /
    • 2008
  • Nowadays, the computational capability and graphical power based on PCs increase very rapidly every year. As a result, the complicated engineering or scientific problems that could have only been handled by supercomputers a couple of decades ago can now be routinely run on PCs. Besides, the PCs can be assembled in parallel to increase its computational capability theoretically without limitation. The Web-based interface and communication tools are also being enhanced very rapidly and the real-time distance learning (E-Learning) and project cooperation on web get increasing attention. Using the-state-of-the-art computational method, a number of complicated and computationally intensive problems are being solved by PCs. The results can be well demonstrated on screen by graphics and animation tools. Those examples include the simulations of fully nonlinear waves, their interactions with floating bodies, global-motion analysis of multi-unit floating production system including complicated mooring lines and risers. Several examples will be presented in this regard. Also, Web and java-applet based educational tools have been developed at Texas A&M University for better understanding of waves and wave-body interactions. The background and examples of such Web-based educational tools published in Kim et al. (2003) are briefly introduced here.

Signal Integrity Issues for Reliable Electronic System Designs

  • Eo, Yung-Seon
    • Proceedings of the Korean Reliability Society Conference
    • /
    • 2004.07a
    • /
    • pp.37-72
    • /
    • 2004
  • Future Circuit Design means "Unimaginable Intricate Engineering Problems" Thus, Future Circuit Designers may be "Victims" of "Inexorably Complicated Signal Integrity Problems".(omitted)grity Problems".(omitted)tted)

  • PDF

Dynamic Analysis of Soil-Structure System Considering Characteristics of Structure and Complicated Soil Profile (구조물과 복잡한 지층 특성을 고려한 지반-구조물 시스템의 동적 해석)

  • Park, Jang-Ho
    • Journal of the Korean Society of Safety
    • /
    • v.22 no.5
    • /
    • pp.50-56
    • /
    • 2007
  • In the past, a number of approaches, such as analytical, numerical or experimental methods, have been developed to deal with the soil-structure interaction effects. However, for many problems with complex geometry and material discontinuity most of approaches are nearly unpractical since it is difficult to model structures and complicated soil profiles precisely. This paper presents a soil-structure interaction analysis approach, which carl consider precisely characteristics of structures and complicated soil profiles. The presented approach overcomes the difficulties by adopting an unaligned mesh generation approach. From numerical examples, the applicability of the proposed approach is validated and dynamic responses of soil-structure systems subjected to earthquake loading are investigated considering characteristics of structures and complicated soil profiles.

The Application of Wraparound Model to Korean Adolescents with Complicated Problems: A bibliographical study (복합적 문제를 나타내는 청소년을 위한 랩어라운드 모델의 국내적용 가능성에 관한 문헌적 연구)

  • Lee, Jee-Sook
    • The Journal of the Korea Contents Association
    • /
    • v.16 no.3
    • /
    • pp.476-487
    • /
    • 2016
  • Although the number of adolescents with complicated problems and needs has increased, there has been a limited service for this population. In addition, a traditional social service could not alleviate the problems. In order to provide an alternative to a traditional social service to this population, the wraparound model is reviewed and explored. The study presents a review of literature on wraparound and social work via EBSOCO. By reviewing 12 articles on the subject, the study discovers 3 topics, such as (1) youth with various problems, (2) general characteristics of wraparound, and (3) evidence-based practice and wraparound. Based on 3 topics, the study also discusses the feasibility of wraparound service in Korea.

Analysis of Soil-Structure Interaction Considering Complicated Soil Profile (복잡한 지층 형상을 고려한 지반-구조물 상호작용 해석)

  • Park, Jang-Ho
    • Journal of the Korean Society of Safety
    • /
    • v.21 no.3 s.75
    • /
    • pp.87-93
    • /
    • 2006
  • When a structure is constructed at the site composed of soil, the behavior of a structure is much affected by the characteristics of soil. Therefore, the effect of soil-structure interaction is an important consideration in the design of a structure at the site composed of soil. Precise analysis of soil-structure interaction requires a proper description of soil profile. However, most of approaches are nearly unpractical for soil exhibiting material discontinuity and complex geometry since those cannot consider precisely complicated soil profiles. To overcome these difficulties, an improved integration method is adopted and enables to integrate easily over an element with material discontinuity. As a result the mesh can be generated rapidly and highly structured, leading to regular and precise stiffness matrix. The influence of soil profile on the response is examined by the presented method. It is seen that the presented method can be easily used on soil-structure interaction problems with complicated soil profile and produce reliable results regardless of material discontinuities.

Matrix-Based Intelligent Inference Algorithm Based On the Extended AND-OR Graph

  • Lee, Kun-Chang;Cho, Hyung-Rae
    • Proceedings of the Korea Inteligent Information System Society Conference
    • /
    • 1999.10a
    • /
    • pp.121-130
    • /
    • 1999
  • The objective of this paper is to apply Extended AND-OR Graph (EAOG)-related techniques to extract knowledge from a specific problem-domain and perform analysis in complicated decision making area. Expert systems use expertise about a specific domain as their primary source of solving problems belonging to that domain. However, such expertise is complicated as well as uncertain, because most knowledge is expressed in causal relationships between concepts or variables. Therefore, if expert systems can be used effectively to provide more intelligent support for decision making in complicated specific problems, it should be equipped with real-time inference mechanism. We develop two kinds of EAOG-driven inference mechanisms(1) EAOG-based forward chaining and (2) EAOG-based backward chaining. and The EAOG method processes the following three characteristics. 1. Real-time inference : The EAOG inference mechanism is suitable for the real-time inference because its computational mechanism is based on matrix computation. 2. Matrix operation : All the subjective knowledge is delineated in a matrix form, so that inference process can proceed based on the matrix operation which is computationally efficient. 3. Bi-directional inference : Traditional inference method of expert systems is based on either forward chaining or backward chaining which is mutually exclusive in terms of logical process and computational efficiency. However, the proposed EAOG inference mechanism is generically bi-directional without loss of both speed and efficiency.

  • PDF