• 한국컴퓨터정보학회논문지
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• 제21권12호
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• pp.1-10
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• 2016

In this paper, we attempt to prevent certain cases by tracing a history and making genogram about open source software and its modification using similarity of source code. There are many areas which use open source software actively and widely, and open source software contributes their development. However, there are many unconscious cases like ignoring license or intellectual properties infringe which can lead litigation. To prevent such situation, we analyze source code similarity using program dependence graph which resembles subgraph isomorphism problem, a typical NP-complete problem. To solve subgraph isomorphism problem, we utilized harmony search of metaheuristic algorithm and compared its result with a genetic algorithm. For the future works, we represent open source software as program dependence graph and analyze their similarity.

• Journal of the Korean Data and Information Science Society
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• 제23권3호
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• pp.595-604
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• 2012

In this article, we consider chaotic behavior happened in nonsmooth dynamical systems. To quantify such a behavior, a computation of Lyapunov exponents for chaotic orbits of a given nonsmooth dynamical system is focused. The Lyapunov exponent is a very important concept in chaotic theory, because this quantity measures the sensitive dependence on initial conditions in dynamical systems. Therefore, Lyapunov exponents can decide whether an orbit is chaos or not. To measure the sensitive dependence on initial conditions for nonsmooth dynamical systems, the calculation of Lyapunov exponent plays a key role, but in a theoretical point of view or based on the definition of Lyapunov exponents, Lyapunov exponents of nonsmooth orbit could not be calculated easily, because the Jacobian derivative at some point in the orbit may not exists. We use an algorithmic calculation method for computing Lyapunov exponents using time series for a two dimensional piecewise smooth dynamic system.

• 소성∙가공
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• 제12권5호
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• pp.504-512
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• 2003

The plastic strain ratios(R-values) of low carbon steel sheets were determined by the automatic strain measurement method using two extensometers, the indirect photo method for the same tensile specimen during tensile test and the indirect method for the specimen after tensile test. The experimental results showed that the measured plastic strain ratios from the automatic strain measurement method using two extensometers coincided with those from the indirect photo method and the indirect method for all tensile specimens. In addition, the strain dependence of plastic strain ratios could be continuously recorded and the anisotropy of the strength coefficient, K, and strain hardening exponent, n, could be automatically calculated in three directions by computer through the use of two extensometers. The experimental results showed that the strain dependence of R-value was related to the anisotropy of strain hardening exponent in low carbon steel sheets.

• 한국공간구조학회논문집
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• 제23권4호
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• pp.51-58
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• 2023

In this study, the displacement dependence, strength, and energy dissipation capacity of the steel rod damper were evaluated. The test variables are the number of steel rod dampers and the lateral deformation prevention details. From test results, it was evaluated that the displacement dependence conditions in the structural design code were satisfied. The maximum strength and energy dissipation capacity increased linearly as the number of steel rod increased. In addition, the maximum strength and energy dissipation capacity were evaluated by more than 20 times increased by using of the lateral deformation prevention details.

• 한국컴퓨터정보학회논문지
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• 제24권11호
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• pp.255-262
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• 2019

본 연구는 청소년의 삶의 만족도에 영향을 주는 요인을 살펴보고자 한국 아동 청소년 패널조사(KCYS)의 중1 패널데이터를 대상으로 분석하였다. 이를 바탕으로 청소년들의 삶의 만족도를 높이기 위한 올바른 휴대폰 사용과 팬덤활동에 관한 실천적 정책적 방안을 제언하는 것을 목적으로 한다. 본 연구의 분석방법으로 AMOS 23.0을 활용하였으며, 연구결과, 첫째, 청소년의 삶의 만족도가 높을수록 휴대폰 의존도가 낮은 것으로 나타났다. 둘째, 청소년의 휴대폰 의존도는 자아탄력성에 의해 삶의 만족도에 유의한 영향을 미치는 것으로 나타났다. 결론적으로 청소년들의 삶의 만족도를 향상시키기 위해서는 사회정서발달 및 급변하는 문화 활동에 맞는 맞춤형 프로그램이 개발 보급되어야 할 것 임을 시사하고 있다.

• 천문학회보
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• 제44권1호
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• pp.40.3-40.3
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• 2019

There is growing evidence for the dependence of Type Ia supernova (SN Ia) luminosities on the environments. The origin of this correlation, however, is under debate. In order to explore the physical origin of the trend in detail, we analyze SN Ia light-curves by combining a sample of 1231 SNe Ia over a wide redshift range (0.01 < z < 1.37) in various SN surveys and employing two independent light-curve fitters of SALT2 and MLCS2k2. Although SALT2 is the most widely used fitter in the SN community, MLCS2k2 has a novelty in the context of an investigation of the luminosity evolution of SNe Ia. For this reason we use both fitters and analyze them separately. We also determine a stellar mass and a star formation rate (SFR) for a sample of ~600 host galaxies. In addition, because recent low-redshift studies suggest that this dependence manifests itself most strongly when using the local SFR at the SN location, we introduce a new method to infer the local environments by restricting the SN Ia sample in globally star-forming host galaxies to a low-mass host galaxy subset (${\leq}10^{10}M_{\odot}$). We find that SNe Ia in low-mass and star-forming host galaxies are fainter than those in high-mass and passive hosts, after light-curve corrections. Especially, for the first time in host studies, we show that SNe Ia in locally star-forming environments are $0.081{\pm}0.018$ mag fainter ($4.5{\sigma}$) than those in locally passive environments from the sample including SNe at the high-redshift range. Considering the significant difference in the mean stellar population age between these environments, the result would suggest that the origin of the environmental dependence is the luminosity evolution of SNe Ia.

• 문화기술의 융합
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• 제7권4호
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• pp.591-597
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• 2021

사회적으로 스마트기기를 통한 활용교육이 증가하고, 메타버스 등의 다양한 콘텐츠가 증가하면서 하면서 대학생들의 스마트기기의 과의존 또는 중독, 학습효과의 저하 등에 대한 부작용이 적지 않게 나타나고 있다. 이러한 스마트기기의 과의존은 왜 발생하는지를 파악하기 위해 스트레스, 스트레스 대처를 통한 구조적 관계를 분석하였다. 또한 대학생의 마음챙김 정도에 따라 이러한 구조적 관계에 차이가 나타나는지를 분석하였다. 분석결과를 요약하면 다음과 같다. 첫째, 대학생들이 지각하는 스트레스가 높아질수록 스트레스 대처가 높아지는 것으로 나타났다. 둘째, 적극적 대처가 높아질수록 스마트기기의 과의존이 낮아지고, 소극적 대처가 높아질수록 과의존이 높아지는 것으로 나타났다. 셋째, 마음챙김의 정도가 높을수록 스트레스에 대해 적극적 대처가 이루어지고 이로 인해 과의존은 낮아지며, 마음챙김의 정도가 낮을수록 스트레스에 대해 소극적인 대처가 이루어짐으로 인해 스마트기기의 과의존이 높아지는 것으로 나타났다.

• 대한불안의학회지
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• 제1권1호
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• pp.31-36
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• 2005

Benzodiazepine (BDZ) has the possibilities of development of tolerance, withdrawal symptoms, and abuse/addiction, as well as chronically adverse effects. Although many guidelines have proposed the restricted prescription of them, their uses in many psychiatric areas as well as primary practice are still wide spread. So we tried to reappraise the clinical characteristics of BDZ and then to consider the appropriate use. Firstly, meta-analyses on long-term use of BDZ indicated the cognitive impairment, which could be improved after discontinuation of BDZ. Next, there have been some evidences that the long-term use of BDZ does not develop tolerance, contrary to our concern, and maintains good anxiolytic effects. Also, physiological dependence should be discriminated from abuse/addiction, assuming the reality that the risk of BDZ abuse/addiction is surely overestimated. These issues are discussed in detail.

• Journal of Microbiology and Biotechnology
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• 제28권11호
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• pp.1883-1895
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• 2018

Alcohol dependence is a global public health problem, yet the mechanisms of alcohol dependence are incompletely understood. The traditional view has been that ethanol alters various neurotransmitters and their receptors in the brain and causes the addiction. However, an increasing amount of experimental evidence suggests that gut microbiota also influence brain functions via gut-to-brain interactions, and may therefore induce the development of alcohol use disorders. In this study, a rat model of alcohol dependence and withdrawal was employed, the gut microbiota composition was analyzed by high-throughput 16S rRNA gene sequencing, and the metagenome function was predicted by PICRUSt software. The results suggested that chronic alcohol consumption did not significantly alter the diversity and richness of gut microbiota in the jejunum and colon, but rather markedly changed the microbiota composition structure in the colon. The phyla Bacteroidetes and eight genera including Bacteroidales S24-7, Ruminococcaceae, Parabacteroides, Butyricimonas, et al were drastically increased, however the genus Lactobacillus and gauvreauii in the colon were significantly decreased in the alcohol dependence group compared with the withdrawal and control groups. The microbial functional prediction analysis revealed that the proportions of amino acid metabolism, polyketide sugar unit biosynthesis and peroxisome were significantly increased in the AD group. This study demonstrated that chronic alcohol consumption has a dramatic effect on the microbiota composition structure in the colon but few effects on the jejunum. Inducement of colonic microbiota dysbiosis due to alcohol abuse seems to be a factor of alcohol dependence, which suggests that modulating colonic microbiota composition might be a potentially new target for treating alcohol addiction.

• 대한가정학회지
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• 제38권4호
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• pp.33-48
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• 2000

This study was designed to examine the degree of dependence on dietary environment, evaluate the perception of metal service program and investigate factors affecting the demand for meal service programs for elderly parents. The purpose of this study provided the basic information for the development and systemization of meal service program for elderly. Eight hundred twenty semen adults who have elderly parents were surveyed using pre-designed written questionnaire. According to the results on the life environments of their elderly parents, psychological factors(41.7%), living condition(14.3%) and dietary environment (13.2%) had trouble. Physical and psychological conditions significantly affected the dietary environment(p<0.05). Only 9.2% of the subjects were already aware of recognized the meal service program for elderly, and the degree of recognition differed significantly by sex and education level. Women had better perception of meal service program for elderly than men. In men, they would expect to use congregate meal service(44.1%), home-delivered meal service (23.7%), nursing home meal service(16.9%) in order. On the other hand, for women, home-delivered meal service (41.2%), congregate meat service(44.1%), and nursing home meal service (16.8%) in order. Therefore there are significant differences between men and women what type they want(p<0.001). For those who haute both of the parents or either one of them, they would use more of congregate meal service (38.8%) and home-delivered meal service (38.8%) than nursing home meal service (15.5%). The group whose parents are lower socio-economic status would have tendency to use the nursing home meal service (p=0.06). The group of whom believe the dietary environment is the problem of their parents'life environment had preference of using congregate meal service and home-delivered meal service.