• Korean Management Science Review
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• v.8 no.1
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• pp.51-70
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• 1991

This paper discusses planning and scheduling problems for efficient utilization of an FMS and presents an integrated decision support system for FMS production planning and scheduling problems. The decision support system, FMSDS(Flexible Manufacturing Systems Decision Support System), includes of data of handling module, part selection module, loading module, load adjusting module, scheduling module and simulation module etc. This paper includes the solution methodology of each subproblem. And an integrated interface scheme between the subproblems is presented. The interface scheme considers the relationships between the subproblems and generates solution using hierarchical and looping approaches. FMSDS is made up of six alternative models considering 3 loading objectives and 2 production order processing strategies. Performance comparisons among 6 alternatives and other decision support systems are shown using the non-terminating simulation techniques.

• Korean Journal of Computational Design and Engineering
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• v.11 no.3
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• pp.211-222
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• 2006

In collaborative environment, it is necessary that the participants in collaboration should share the same understanding about the semantics of terms. For example, they should know that 'COMPONENT' and 'ITEM' are different word-expressions for the same meaning. In order to handle such problems in information sharing, an information system needs to automatically recognize that the terms have the same semantics. So we develop an algorithm mapping two terms based on their ontological definitions and their similarities. The proposed algorithm consists of four steps: the character matching, the inferencing, the definition comparing and the similarity checking. In the similarity checking step, we consider relation similarity and hierarchical similarity. The algorithm is very primitive, but it shows the possibility of semi-automatic mapping using ontology. In addition, we design a mapping procedure for a mapping system, called SOM (semantic ontology mapper).

• IEMEK Journal of Embedded Systems and Applications
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• v.7 no.4
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• pp.201-207
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• 2012

Currently, NAND Flash memory has been widely used in consumer storage devices due to its non-volatility, stability, economical feasibility, low power usage, durability, and high density. However, a high capacity of NAND flash memory causes the high power consumption and the low performance. In the convention memory research, a hierarchical filter mechanism can archive an effective performance improvement in terms of the power consumption. In order to attain the best filter structure for NAND flash memory, we selected a direct-mapped filter, a victim filter, a fully associative filter and a 4-way set associative filter for comparison in the performance analysis. According to the results of the simulation, the fully associative filter buffer with a 128byte fetching size can obtain the bet performance compared to another filter structures, and it can reduce the energy*delay product(EDP) by about 93% compared to the conventional NAND Flash memory.

• Journal of the Korea Society of Computer and Information
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• v.3 no.3
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• pp.89-98
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• 1998

In this paper, we propose new image coding using wavelet transform. The new method constructs hierarchical bit plane and progressively transports each bit plane. The proposed algorithm not only supports multi-resolution, dividing original image into special band and various resolution but also reduces blocking effects that come into JPEG In encoding time, this algorithm considers each band characters and priority of transport order, and applies to fast search of image.

• Journal of Families and Better Life
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• v.28 no.2
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• pp.17-26
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• 2010

This study aimed to explore psychological separation from parents, family adaptability, and child's adjustment to college, in order to assess general standards and sex difference. It also investigated explaining variables on children's adjustment to college. The study subjects were 243 college students(male students; 123, female students; 120).The data collected from questionnaire were analyzed by descriptive statistics, t test, Pearson's correlation and hierarchical multiple regression. The main results were as follows: Firstly, psychological separation from parents of college students were lower than those of average score. But family adaptability and adjustment to college of students were higher than those of average score. Secondly, psychological separation from parents was negatively correlated to adjustment to college, but family adaptability was positively correlated to adjustment to college. Finally, variables that explain child's adjustment to college was cohavitation with parents and family adaptability. In addition to these variables, psychological separation from parents was a major factor for female students.

• Research in Community and Public Health Nursing
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• v.29 no.1
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• pp.21-32
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• 2018

Purpose: This study attempted to identify regional disparities of self-rated health among Korean wage workers and to investigate the influencing factors on them. Methods: The study subjects were 25,069 workers in 16 regions who were extracted from the 2014 Korean Working Condition Survey (KWCS). A multilevel analysis was conducted by building hierarchical data at individual and regional level. Results: In this study, 'financial autonomy rate' and 'current smoking rate' were identified as regional factors influencing the workers' self-rated health. When the socio-demographic and occupational factors of the workers were controlled, 'current smoking rate', a health policy factor, explained the regional disparity of workers' health status. Conclusion: We found that the health status of workers can be affected by the health behavior level of the whole population in their residential area. In order to improve the health status of working population and to alleviate their regional health inequalities, it is necessary to strengthen macro and structural level interventions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.4
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• pp.834-847
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• 1996

A selective coding scheme is proposed that describes a method for coding image sequences distinguishing bits between background and target region. The suggested method initially estimates global motion parameters and local motion vectors. Then segmentation is performed with a hierarchical clustering scheme and a quadtree algorithm in order to divide the processing image into the backgraound and target region. Finally image coding is done by assigning more bits to the target region and less bits to background so that the target region may be reconstructed with high quality. Simulations show that the suggested algorithm performs well especially in the circumstances where background changes and target regionis small enough compared with that of background.

• Journal of the Korean housing association
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• v.14 no.1
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• pp.11-18
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• 2003

The purpose of this study is to make clear the identity of Korean traditional housing. And I'm trying to search characteristics of boundary in Korean traditional housing. In this study, I have analyzed boundary of ‘Gwan-gajung’. It is constructed on a square shaped plan, there is an elegant middle court, and a counter-roofed shrine house in the rear of the inner building. In this study, the definition of boundary is made based on what has been perceived as the proper structure, whose characteristics can be described in terms of openness, inside and outside parts and orientation. As a critical factor to spatial qualities, boundary is closely related with the connection and disconnection, background and atmosphere, and inferior and superior relations and hierarchical order from the view of space. The result of study is like followings. The characteristics of boundary in Korean traditional housing is 1. one way direction of penetrability, 2. having the face and the back 3. orientation 4. duplication.

• Journal of the Korean housing association
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• v.11 no.2
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• pp.75-83
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• 2000

The purpose of this study was to analyze spatial characteristics of Chinese traditional residents. This study was carried out in order to have a clear understanding of how cultures of neighboring countries influence Korean residential history and to grasp an objective view on characteristics of Korean houses by comparing and contrasting the characteristics of Chinese residents. This survey was conducted by observing, interviewing, taking pictures and analyzing the pictures that were taken on the real spot. Additional data were collected by participating the seminars of Chinese experts on the traditional house. The spatial layouts and function of Chinese traditional house were analyzed by using pictures, sketches and data which were gathered by interviewing and observing. The shape of Chinese traditional unit plans of houses is basically linear. By repeating this linear shape in the south.north and east.west side, various shapes are formed as an outcome. tangwu and woshi, the living space of Chinese traditional house are strictly hierarchical.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.276-278
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• 1992

This paper presents a method of hierachical optimal control for time invariant large scale systems via Single Term Walsh Series. It is well known that the optimal control of a large scale system with quadratic performance criteria often involves the determination of time varying feedback gain matrix by solving the matrix Riccati differential equation, which is usually quite difficult. Therefore, in order to solve the problem, this paper is introduced to Single Term Walsh Series. The advantages of proposed method are simple and attractive for the control of large scale system in computation.