• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.1
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• pp.1-11
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• 1999

In this paper, we proposed a design method of parameterized viterbi decoder, which automatically synthsizes the diverse viterbi deciders used in the digital mobile communication systems. It is designed to synthesize a viterbi decoder specified by user-provided parameters. Those parameters are constraint length, code rate generator polynomials of teh convolutional encoder, data rate and bits/frame of the data transmission, and soft decision bits of viterbi decoder. For the design of the parameterized viterbi decoder, we designed a user interface module C-language, and a viterbi decoder module in a hierarchical atructure using VHDL language and its generic statement. For the verification of the parameterized viterbi decoder, we compared our synthesized viterbi decoder with the conventional viterbi decoder which is designed for the IS-95 CDMA system. The proposed design method of the viterbi decoder will be a new method to obtain a required viterbi decoder in a very short time only by supplying the design parameters.

• Journal of the Korea Concrete Institute
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• v.21 no.3
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• pp.255-264
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• 2009

Permeability coefficient of concrete is a substaintial key parameter for understanding the durability performance of concrete and its microstructural densification. Many researches for the issue have been accomplished, however, it is very rare to deal with the theoretical study on permeability coefficient in connection with carbonation of concrete and the the effect of volumetric fraction of cement paste or aggregate on the permeability coefficient. The majority of these researches have not dealt with this issue combined with carbonation of concrete, although carbonation can significantly impact on the permeability coefficient of concrete. The purpose of this study is to establish a fundamental approach to compute the permeability coefficeint of (non)carbonated concrete. When simulating a microstructural characteristics as a starting point for deriving a model for the permeability coefficient by the numerical simulation program for cementitious materials, HYMOSTRUC, a more realistic formulation can be achieved. For several compositions of cement pastes, the permeability coefficient was calculated with the analytical formulation, followed by a microstructure-based model. Emphasis was on the microstructural changes and its effective change of the permeability coefficient of carbonated concrete. For carbonated concrete, reduced porosity was calculated and this was used for calculating the permeability coefficeint. The computational result was compared with experimental outcome.

• The Journal of the Korea Contents Association
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• v.16 no.6
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• pp.323-333
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• 2016

This study aimed at specifically validating the mediating effect of the elderly's leisure participation with regards to the impact of socio-economic factors on the elderly's satisfaction with life. This paper analyzed the data of 7,486 people who participated in the 4th research of the 2012 Korean Longitudinal Study of Ageing (KLoSa) by Korea Labor Institute. The outcome is as follows. First, among socio-economic factors, educational background, total household income and net asset were found to have positive impact on the elderly's satisfaction with life. When the level of the three factors was higher, the satisfaction with life was also greater. Second, the three socio-economic factors (educational background, total household income and net asset) affected the elderly's satisfaction with life through mediating effect of leisure participation. Those with higher educational background, total household income and net asset showed more leisure participation, leading to greater satisfaction with life.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.396-408
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• 2013

The purpose of this research is to derive space storytelling factors newly among the evaluating factors of the building artwork and to present their roles and functions and to verify the effectiveness thereof. Random sampling was carried out on 204 residents who experience space storytelling in Ilsan Wi-City. The new evaluation factor was extracted by deriving the space storytelling factor through a theoretical study on the building artwork evaluation factors: formativeness factor, sociality factor, and environmental factor. And the effects of the space storytelling factor extracted in this way and the existion sculpture evaluation factor on the facilities affinity and the purchase intention were examined. This study will serve as a momentum for the building artwork to be harmonized with the surrounding fine view within urban space and to raise the quality of life of the residents.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.263-276
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• 2013

The research analyzed to verify that self-support center employee's internal marketing, social exchange relation and personal characteristic effect on self-support program which is essential to provide job and to progress self-support ability for workable low-income group. The research used questionnaires of 156 substances to analyze in self-support center employee within Gwang-Ju area. The questionnaire was analyzed using statistical package for the social sciences(SPSS) program and it used factor analysis, reliability analysis and especially hierarchical regression multiple analysis for hypothesis test. The result of research that self-support center employee's education, training, delegation of authority and job efficacy effect on maximize business result through mediated effect of emotional immersion. Therefore, the research proposes improvement of self-support center employee's education, training, delegation of authority and job efficacy.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.263-271
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• 2018

The aim of this study was to investigate whether there is the relationship between husband support and depression mediated to connubial bliss in Korean married women. A total of 2,120 married women were selected from the database of the Fourth Korea Longitudinal Survey of Women and Families (KLoWF) in 2011-2012. By the structure equation model, among of the husband support, the husband awareness was regarded as the dominant factor related to depression in Korean married women. Then comes couple activity, visiting of parents and division of household labor in that order. This study suggests that husband support significantly associated with connubial bliss and depression in Korean married women. The above findings will help design policy plans to reduce the depression of married women in the nation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.1
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• pp.131-142
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• 1994

This paper analyzes the properties of such algorithm that corresponds to the nonlinear adaptive algorithm with additional update terns, parameterized by the scalar factors ${\alpha}1,\;and\;{\alpha}2$. The analysis of concergence leads to eigenvalues of the transition matrix for the mean filter coefficient vector. Regions in which the algorithm becomes stable are demonstrated. The time constant is derived and the computational complexity of the QFG algorithm is compared with those of the conventional LMS. sign, and LFG algorithm. The properties of convergence in the mean square error is derived and the neccessary condition for the CFG algorithm to be stable is attaned. In the computer simulation a channel equalization is utilized to demonstrate the performance feature of the QFG algorithm. The QFG algorithm has the more computational complexities but the faster convergence speed than LMS and LFG algorithm. Since the QFG algorithm has smoother convergence, it may be useful in case where error bursting is a problem.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.33 no.5
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• pp.331-338
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• 2020

In this study, the characteristic of a 3-D micro-woven material, which is one of the newly developed periodic open-cell structure, is analyzed through various computational simulations. To increase the accuracy of the numerical simulations, the distance between each directional wire is parameterized using six design variables, and its model geometry is precisely discretized using tetrahedron elements. Using the improved computational model, the material properties of the mechanical, thermal, and fluidic behavior are investigated using commercial software and compared with the previous experimental results. By changing the space between the x- and y-directional wires, a parametric test is performed to determine the tendency of the change in the material properties. In addition, the correlation between two different material properties is investigated using the Ashby chart. The result can further be used in determining the optimal pattern and wire spacing in 3-D micro-woven materials.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.1 no.1
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• pp.67-74
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• 1987

백열등의 POWER 평형 방정식을 통한 동작중의 필라멘트 온도와 광속 그리고 수명을 예측할 수 있는 이론이 제시되었다. POWER 평형 방정식을 설정함으로써 백열등 시스템을 모형화 하고, 방정식을 풀므로써 예측할 수 있는 형식으로 예측이론은 구성되었다. 가정용 110V전구에 대해 실측치와 비교해 본 결과, 충분한 타당성이 있음이 입증되었다. 본 이론의 정확한 예측성은 백열등을 해석, 이해하는 데 열쇠가 되는 제특성치를 제공할 수 있었는데 아직 생산단계에 있지 않은 크립톤가스등의 특성치도 추정할 수 있었다. 또 하나의 유용성은 백열등 설계를 위한 제 매개변수간의 관계식을 본 이론으로부터 도출하여 기존의 경험에만 의존하는 설계법을 보완하고 새로운 설계시 최적설계치를 선정할 수 있다는 점에 있다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.7 no.1
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• pp.111-120
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• 1987

A frequency analysis procedure for the multi-year drought severity/magnitude is developed using observed duration-dependent deficit properties. A standardization of the deficit with the decimated monthly deficit statistics and a data pooling procedure are performed to identify the change of mean deficit. The reproductive properties of the Gamma family of distribution for the deficit are utilized to estimate the parameters of drought magnitude and severity. Compounding of these distributions with the duration distribution and an implication of the results for the realtime forecasting are discussed.