• Title/Summary/Keyword: Local Problems

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LOCAL EXISTENCE AND GLOBAL UNIQUENESS IN ONE DIMENSIONAL NONLINEAR HYPERBOLIC INVERSE PROBLEMS

  • Choi, Jong-Sung
    • Communications of the Korean Mathematical Society
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    • v.17 no.4
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    • pp.593-606
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    • 2002
  • We prove local existence and global uniqueness in one dimensional nonlinear hyperbolic inverse problems. The basic key for showing the local existence of inverse solution is the principle of contracted mapping. As an application, we consider a hyperbolic inverse problem with damping term.

A Study on Mea'sures to Improve Housing Policy for Population Declining Cities (인구감소형 도시의 주택정책 개선방안 연구)

  • Moon, Tae-Hoon
    • Korean System Dynamics Review
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    • v.12 no.2
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    • pp.127-151
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    • 2011
  • The purpose of this study is to examine measures to improve government's supply oriented housing policy in population declining cities. For this purpose, system dynamics simulation method was used to build urban-housing model and different sets of housing policies were tested to see their impact on local housing problems. Simulation result shows that there is no best set of housing policies that can solve all housing problems in population declining cities. It also indicates that housing policy that solve one type of problems can worsen other type of problems. Housing policy that increases population size has negative effect of housing oversupply. It also increases proportion of old houses in population declining cities. However, housing policy that makes city younger with newer houses tends to increase housing shortage and housing price. So, policy choice needs to be made with clear understanding of trade off between different policies. The result also shows it is difficult to expect a full scale effect of housing policy on local housing problems unless it is executed with regional economic development policy because local housing problems are so closely related with local economic problem in population declining local cities.

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A Study on Improvement for Local Telecommunication Network -A case of Pusan & Kyungnam Province- (지역정보통신망의 개선방안에 관한 연구 -부산.경남지역을 중심으로-)

  • 박민수;김광현;김기문
    • Journal of the Korean Institute of Navigation
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    • v.20 no.4
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    • pp.111-128
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    • 1996
  • This paper is focused on the desirable improvement schemes of the local network of information and telecommunication network. In this study, we examined whether polices of information and telecommunication of government have been carried out a desirable programme to meet the public interest, found out several problems in the these policies. Such problems as follows : (1) a system of local information & telecommunication is developing by a Model of Top-Down. In the present management system, an interest of the public of local society about the local telecommunication network is a much lower level, (2) there is no general controlling roll of the local information & telecommunication, (3) there is no service controlling system of local telecommuni-cation, and (4) there is no organic coordinating system of inter-departments in the central government level. In order to resolve these problems, this study suggests a few desirable sxhemes for the local telecommunication : (1) an establishment of middle-long range planning for the integrated future network of info-telecommunication, (2) an organizing of telecommunication network being suitable for the local characteristics toward B-ISDN.

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A Study on the Usefulness of the Countermeasures locally for the stack-effect in High-rise building (국소적 연돌효과 저감대책의 효용성에 관한 연구)

  • Seo, Jung-Min;Lim, Hyun-Woo;Lee, June-Ho;Lee, Joong-Hoon;Song, Doo-Sam
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.300-305
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    • 2009
  • High-rise buildings have some problems by stack effect. And, the solutions on the problems should be determined by considering an overall building. But, ordinarily, the countermeasures on the problems are applied to local part of the building. Local countermeasures often can be possible to arouse the secondary problems accompanied by the stack-effect. In this study, the usefulness of local countermeasures are evaluated in terms of both the reduction effect on problems and the possible secondary problems with simulations. The simulation results show that the application of countermeasures on an overall building is very important and that local countermeasures can be used optionally according to building's conditions.

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Local Governance from the Perspective of Community Welfare: Focusing on 'Gwangju Greenway' as a Case (지역사회복지관점에서 로컬거버넌스 특성 분석: 광주 푸른길 사례를 중심으로)

  • Shim, Mi-Seung
    • The Journal of the Korea Contents Association
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    • v.16 no.9
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    • pp.94-104
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    • 2016
  • Community recently pays attention to participation, network, and partnership of local residents and community stakeholders for the purpose of solving community problems and issues. This is the typical characteristics of local governance as an institutional setting to solve the problems which communities face with. The aim of this study is to attempt an analysis of local governance from the perspective of community welfare. To do that, it especially focuses on 'Gwangju Greenway' as a case. Participation of and communications among local residents strengthen their community's capabilities to deal with problems and seek better solutions. Above all, networking and cooperation between local government and local residents are required to improve the quality of local residents' participation at the process of planning and policy-making in the area of community welfare. 'Gwangju Greenway' is a good example of community welfare in that local residents actively seek to solve their own problems and realize common good within their local community through the improvement of social interaction and solidarity among local residents, thus resulting in good quality of life.

A Study on the Consumers' Role in the Local Food System (지역식량체계에서 소비자의 역할에 관한 연구)

  • Kim, Jong-Duk
    • The Korean Journal of Community Living Science
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    • v.18 no.4
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    • pp.617-627
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    • 2007
  • The problems of agriculture and food production in Korea are serious. These problems were brought about by the global food system. In this system, farmers and consumers are disconnected. The distance between food production on the farm to the consumer's table is too long. Farmers can not survive as their food dollar is steadily decreasing. Consumers have to eat old, unclean, and poor-quality foods because the foods do not come from nearby farms. They do not know where their food has come from or by whom their food was grown. In order to solve these problems, the transition from the global food system to a local food system is imperative. In a local food system, farmers and consumers are connected and they can help each other. This study identifies the consumers' role in the local food system. They are the purchasers of local food. They are active participants both in producing and distributing local food, and in taking part in the local food movement. Above all, they are the teachers of the younger generation consumers. While consumers in the global food system are passive, those in the local food system are active. We call the former "food illiterates" and the latter "food citizens." In order to revitalize the local food system, consumers must be food citizens, and therefore, consumer education is necessary. There are several interdependent media forms available for consumer education such as field trips, farm experiences, education for returning to the farm, and food education.

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Finite Element Analysis and Local a Posteriori Error Estimates for Problems of Flow through Porous Media (다공매체를 통과하는 유동문제의 유한요소해석과 부분해석후 오차계산)

  • Lee, Choon-Yeol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.5
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    • pp.850-858
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    • 1997
  • A new a posteriori error estimator is introduced and applied to variational inequalities occurring in problems of flow through porous media. In order to construct element-wise a posteriori error estimates the global error is localized by a special mixed formulation in which continuity conditions at interfaces are treated as constraints. This approach leads to error indicators which provide rigorous upper bounds of the element errors. A discussion of a compatibility condition for the well-posedness of the local error analysis problem is given. Two numerical examples are solved to check the compatibility of the local problems and convergence of the effectivity index both in a local and a global sense with respect to local refinements.

Progress and Problems in Local Public Library Policies of South Korea (지역 공공도서관정책의 추이와 과제 - 광역자치단체를 사례로 하여 -)

  • Jae-Whoan Lee;Chul Jung
    • Journal of Korean Library and Information Science Society
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    • v.54 no.3
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    • pp.1-32
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    • 2023
  • This article intends to explore both progress and problems in local library policies of South Korea, with emphasis on public libraries. Special concerns are given to analyze the strength and weakness of local library regulations and implementation plans, prepared for the promotion of local public libraries. Also investigated are the structural problems in both current procedures and systems for library policy making. The final discussion includes the customized solutions to make local library policies be healthy and reliable, as well as the analysis on the indigenous factors to make local library policies be weak and defective.

A GENERALIZATION OF LOCAL SYMMETRIC AND SKEW-SYMMETRIC SPLITTING ITERATION METHODS FOR GENERALIZED SADDLE POINT PROBLEMS

  • Li, Jian-Lei;Luo, Dang;Zhang, Zhi-Jiang
    • Journal of applied mathematics & informatics
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    • v.29 no.5_6
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    • pp.1167-1178
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    • 2011
  • In this paper, we further investigate the local Hermitian and skew-Hermitian splitting (LHSS) iteration method and the modified LHSS (MLHSS) iteration method for solving generalized nonsymmetric saddle point problems with nonzero (2,2) blocks. When A is non-symmetric positive definite, the convergence conditions are obtained, which generalize some results of Jiang and Cao [M.-Q. Jiang and Y. Cao, On local Hermitian and Skew-Hermitian splitting iteration methods for generalized saddle point problems, J. Comput. Appl. Math., 2009(231): 973-982] for the generalized saddle point problems to generalized nonsymmetric saddle point problems with nonzero (2,2) blocks. Numerical experiments show the effectiveness of the iterative methods.

A Hybrid of Evolutionary Search and Local Heuristic Search for Combinatorial Optimization Problems

  • Park, Lae-Jeong;Park, Cheol-Hoon
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.1 no.1
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    • pp.6-12
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    • 2001
  • Evolutionary algorithms(EAs) have been successfully applied to many combinatorial optimization problems of various engineering fields. Recently, some comparative studies of EAs with other stochastic search algorithms have, however, shown that they are similar to, or even are not comparable to other heuristic search. In this paper, a new hybrid evolutionary algorithm utilizing a new local heuristic search, for combinatorial optimization problems, is presented. The new intelligent local heuristic search is described, and the behavior of the hybrid search algorithm is investigated on two well-known problems: traveling salesman problems (TSPs), and quadratic assignment problems(QAPs). The results indicate that the proposed hybrid is able to produce solutions of high quality compared with some of evolutionary and simulated annealing.

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