• Journal of the Korean Society for Precision Engineering
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• v.16 no.1 s.94
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• pp.49-60
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• 1999

This paper addresses a welding task sequencing for robot arc welding process planning. Although welding task sequencing is an essential step in the welding process planning, it has not been considered through a systematic approach, but it depends rather on empirical knowledge. Thus, an effective task sequencing for robot arc welding is required. Welding perations can be classified by the number of welding robots. Genetic algorithms are applied to tackle those welding task sequencing problems. A genetic algorithm for traveling salesman problem (TSP) is utilized to determine welding task sequencing for a MultiWeldline-SingleLayer problem. Further, welding task sequencing for multiWeldline-MultiLayer welding is investigated and appropriate genetic algorithms are introduced. A random key genetic algorithm is also proposed to solve multi-robot welding sequencing : MultiWeldline with multi robots. Finally, the genetic algorithm are implemented for the welding task sequencing of three dimensional weld plate assemblies. Robot welding operations conforming to the algorithms are simulated in graphic detail using a robot simulation software IGRIP.

• Journal of Power System Engineering
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• v.17 no.6
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• pp.63-72
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• 2013

The main purpose of this study is to analyze the collection characteristics of multi-layer multi-stage porous plate system with ionizer and dielectric-substance experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with experimental parameters such as applied voltage, inlet velocity, stage number and inlet particle concentration, etc. In results, for multi-layer multi-stage porous plate system of inflow type, at 5 stage and $v_{in}$=2.58 m/s, the pressure drop becomes lower 15 $mmH_2O$ as 95 $mmH_2O$ than that of non-inflow type system. It is estimated that for the present system with ionizer and dielectric-substance, the collection efficiency represents 98.5% showing higher 5.2% comparing to that of multi-layer multi-stage porous plate system without ionizer and dielectric-substance at 5 stage, $v_{in}$=2.58 m/s and inlet concentration $3g/m^3$(fly ash).

• Journal of Distribution Science
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• v.15 no.5
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• pp.39-47
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• 2017

Purpose - This study investigated xenophobia that has been a serious social problem, and classified multi-cultural groups in Korea into married immigrant, foreign labor workers and foreign students studying in Korea to examine the effects of fixed idea on multi-cultural persons, multi-cultural education experience, multi-cultural sensitivity, good feeling on multi-cultural persons upon social distance with multi-cultural persons, and to find out counteractions and cultural capacity on the xenophobia. Research design, data, and methodology - The study classified multi-cultural persons into married women immigrant, foreign labor worker, and foreign students studying in Korea to examine the effects of their thoughts on cultural cognition. Self-administered questionnaire was used. The subject was college students in Gyeonggi, Gyeongnam and Chungcheong with industrial complexes, more married women immigrants and more foreign students studying in Korea. Results - As shown in the findings, Korean people had different emotion and preference on married immigrant or foreign students studying in Korea and foreign labor workers. Conclusions - This study investigated the effect of multi-cultural person's cultural distance upon xenophobia. Different preference to multi-cultural persons depending upon fixed idea might produce xenophobia, so that the government was demanded to establish various kinds of policies of lives to live life together with immigrant at government level.

• Journal of the Korean Institute of Rural Architecture
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• v.8 no.1
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• pp.1-8
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• 2006

This thesis has the aim of studying that the problems of space;time, effectiveness of space, economic characters in the architectural space that should be solved in accordance with the multi-purpose furniture in the multi-purpose rooms on the architectural planning method. The scope of this study is on the space of houses, schools and churches. The possibilities of using the methods between the multi-purpose rooms and multi-purpose furniture were tested. And the real furniture designed by the author was introduced among the pages. References, observations and the feedback from the users were used as the method of this study. The following are the contents of this study; 1. Background and the characters of the space in the multi-purpose rooms. 2. Present and potential features of the multi-purpose rooms. 3. Design method of the multi-purpose rooms. 4. Real multi-purpose furnitures designed and the evaluation on those goods. As a result of this study the multi-purpose furniture could be recommended as a good method to improve the spacial enhancement for the multi-purpose rooms. From now on, the researches like this could be studied as good problem seeking methods.

• Journal of Family Resource Management and Policy Review
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• v.13 no.3
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• pp.85-101
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• 2009

The Multi-cultural Family Support Center provides various educational programs and services for multi-cultural families. However, there are controversies regarding integration and assimilation, ethnic identity and ethnocentrism, and state-sponsored multi-culturalism. From the home economist's perspective, it was necessary to explore the direction of integration of family life culture in the multi-cultural society. This study concluded that there is a necessity to accept foreign culture and create a new culture while still maintaining their and our own cultural identity respectively. For this purpose, integration and assimilation must progress side by side to maintain the cultural identity and stability of multi-cultural families. But, women migrants are to adapt in their everyday life, they need to attend a Korean-language course and take part in a traditional Korean culture program such as having an assimilational characteristics. Also for the happiness of multi-cultural families ultimately not for the confronted problems, it requires sometimes education of changing migrants' own traditional customs and life culture partly. In this sense, educational and cultural programs held by Multi-Cultural Family Support Center are meaningful and their importance in adapting into everyday life must be recognised by all of us.

• Journal of the Korean Society for Precision Engineering
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• v.14 no.6
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• pp.22-27
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• 1997

In general, the load which acts on the structure is almost independent of time in many locations. In this case. It is difficult to estimate the life with the service load history, because the structure is on the multi- axial and multi-point loading states. In this study, the service load of the excavator which is widely used in industry field was calculated using measured cylinder pressures and displacements. The fatigue life was estimated using the multi-axial and multi-point load counting method. Service load history of 4 pin joint which act independently each other is yielded by mult-axial and multi-point load counting method. The stress spectrum is yielded by superposition of the results of FEM stress analysis applied unit load. Palm- gren-Miner's cumulative Damage is 0.000804 for Von Mises equivalent stress sequence by one side fillet weld S-N curve. This result agress with Bench test results. As a result of this study, the fatigue life esti- mation using the multi-axial and multi-axial and multi-point load counting method is useful.

• Human Ecology Research
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• v.51 no.6
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• pp.649-663
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• 2013

As cultural diversity has gained a great deal of attention and the social fabric of Korean society is redefined, the number of studies on multi-cultural family homes has been growing in the area of human ecology, but relevant research is rarely found on the subject of housing. While the emphasis of housing research is on multidisciplinary approaches and empirical research is highly valued, a theoretical and methodological platform for discussing the new rising agenda of multi-cultural family homes is lacking. The purpose of this study was to explore approaches to and to discuss the issues in research for multi-cultural family homes in terms of housing theories and multidisciplinary approaches. To understand the housing related needs of multi-cultural families, this study highlights social constructionism, the ecological perspective, and feminist epistemology. These three multidisciplinary approaches were useful for generating an ontological analysis of multi-cultural family homes. Further, this study highlights two housing related theories, the microsociological and housing pathways approaches, for dealing with multi-cultural family homes. In conclusion, the five approaches were useful for exploring issues in housing research on multi-cultural family homes with appropriate research methods like hermeneutics, quantitative, and qualitative methods, and field research. Insights into using perspectives and holistic approaches might be useful for solving the problems of multi-cultural family homes in Korea.

• Journal of Korea Society of Digital Industry and Information Management
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• v.8 no.2
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• pp.117-130
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• 2012

Due to the development of network and device, it is called mobile age that boosts various distribution routes of multi-media content and it constructs a new digital content consumption trend. N-screen is one of the new-introduced examples in the digital age and broadcasting industry believes it as a crisis and challenge as well. It becomes a ubiquitous multi-media environment that people watch multi-media content everywhere and any time they want to and competition happens beyond the boundaries such as network industry, terminal industry, pay TV market, traditional terrestrial TV, etc. And then how should the broadcasting service prepare for the N-screen business? The present research proposes a few terrestial broadcasting content strategies in the multi platform environment. First, instead of N-screen, it proposes multi platform, especially One Source Multi Platform(OSMP). Second, so-called 'Integrated Terrestrial Broadcasting OSMP Alliance(IBPA)' must be founded. Third, IBPA should support multi-tasking UX for viewers to have rich experience. Last, it becomes more important and necessary to support local terrestrial broadcasting service for public service in the multi platform age.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.7
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• pp.1-11
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• 2006

Through the analysis of conventional TVD limiters, a new multi-dimensional limiting function is derived for an oscillation control in multi-dimensional flows. Then, Multi-dimensional Limiting Process (MLP) is developed with the multi-dimensional limiting function. The major advantage of MLP is to prevent oscillations across a multi-dimensional discontinuity, and it is readily compatible with more than 3rd order spatial interpolation. Moreover, MLP shows a good convergence characteristic in a steady problem and it is very simple to be implemented. Through numerical test cases, it is verified that MLP substantially improves accuracy, efficiency and robustness both in continuous and discontinuous flows.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.15 no.9 s.102
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• pp.1037-1044
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• 2005

This paper is concerned with the active vibration control of a grid structure equipped with piezoceramic sensors and actuators. The grid structure is a replica of the solar panel commonly mounted on satellites, which contains complex natural mode shapes. The multi-input and multi-output positive position feedback controller is considered as an active vibration controller for the grid structure. A new concept, the block-inverse technique, is proposed to cope with more modes than the number of actuators and sensors. This study also deals with the stability and the spillover effect associated with the application of the multi-input multi-output positive position feedback controller based on the block-inverse technique. It was found that the theories developed in this study are capable of predicting the control system characteristics and its performance. The new multi-input multi-output positive position feedback controller was applied to the test structure using a digital signal processor and its efficacy was verified by experiments.