• Journal of the Korean Data and Information Science Society
• /
• 제16권3호
• /
• pp.581-589
• /
• 2005

The purpose of this thesis is to develop and introduce Add-in program which we can systematically, visually and dynamically study discrete probability distribution of binomial distribution, poisson distribution and hypergeometric distribution, and continuous probability distribution of normal distribution, exponential distribution, and the definition and characteristics of t distribution, F distribution and ${\chi}^2$ distribution to be driven from normal distribution, and graphs, the computation process of probability by using VBA which is the device of Excel.

• 한국정보과학회논문지:정보통신
• /
• 제30권3호
• /
• pp.416-423
• /
• 2003

본 논문에서는 버퍼를 공유하는 패킷 교환기의 연속 시간 큐잉 모델을 제시하고 큐 길이 확률 분포를 구하는 근사 계산 알고리즘을 제안한다. N 개의 입력 프로세스는 상호 이질적인 버스트 특성을 갖는다. 입력 프로세스는 계차-2 콕시안 분포로서 모형화하며 서버의 서비스 시간은 계차-r 얼랑 분포로서 모형화한다. 근사 알고리즘은 통합된 상태 변수를 사용하여 큐잉 시스템을 표현한다. 먼저 N개의 입력프로세스는 하나의 통합된 상태 변수로 나타내며 큐잉 시스템은 서브 시스템으로 분해하고 이것을 통합된 상태 변수로 나타낸다. 그리고 이러한 통합된 상태 변수를 사용하여 반복적인 방법에 의해서 상태 방정식의 해를 유도한다. 근사 알고리즘의 타당성은 시뮬레이션을 통해서 검증한다.

• 정보처리학회논문지B
• /
• 제10B권1호
• /
• pp.87-94
• /
• 2003

사용자의 접근 형태에 따른 서버 부하의 특성에 관한 연구는 연속미디어 캐슁 정책과 서버 및 네트워크의 부하 분산 정책에 대한 통찰력을 제공한다 본 논문에서는 현재 인터넷을 통해 연속미디어 파일을 실시간 스트림 형식으로 제공하는 세개의 상용 사이트의 로그데이터론 이용하여, 각각의 서버가 보유한 연속미디어 파일의 특성과 각 연속미디어 파일에 대한 사용자 접근 요구의 특성을 분석하였다. 이들 서버는 이전에 발표되어진 연구의 서버보다 많은 연속미디어 파일을 보유하고 있으며, 매우 많은 사용자 접근 요구를 처리하고 있다. 각 서버가 보유한 연손 미디어 파일의 특성은 파일의 크기, 재생 시간, 인코딩 대여폭 등을 농해 분석하였으며, 사용자 접근 요구의 특성은 연속미디어 파일에 대한 사용자 요구 분포, 사용자의 접근 시간 분포, 파일의 인기도에 따른 접근율 분포, 시리즈 연속미디어 파일에 접근 요구수 분포 등을 통해 분석하였다.

• 물과 미래
• /
• 제28권2호
• /
• pp.145-154
• /
• 1995

강우량 자료들을 수공계획에 적절히 사용하기 위해서는 강우량에 대한 다양한 해석기법이 필요하다. 본 연구에서는 연속강우량에 따른 강우사상계열의 수문빈도해석을 위한 확률분포를 연구한 것이다. 2변량 정규분포, 2변량 대수정규분포, 2변량 gamma 분포가 강릉, 서울, 인천, 추풍령, 대구, 전주, 광주, 부산지점의 연속최대 강우량과 그 지속기간으로 이루어진 강우사상의 확률분포로서 적용되었다. 이들 지점의 강우사상 자료가 2변량 정규분포, 2변량 대수정규분포에는 적합되었으나 2변량 gamma 분포에는 적합되지 않았다. 적합도 검정을 통하여 선정된 최적 분포형으로부터 확률강우사상의 빈도곡선을 제시하였다.

• 유통과학연구
• /
• 제19권5호
• /
• pp.49-60
• /
• 2021

Purpose: This study aimed to explore the variables that may play a significant role in inducing Facebook users to use Facebook as online information distribution channels continuously. Research design, data, and methodology: The population of this study are all Facebook users who have actively used Facebook as a social media as online information distribution for at least one year. Purposive sampling technique was used in this study and 290 respondents were enrolled. The data was collected using a questionnaire and further analyzed with path analysis and SEM-PLS approach. Result: The results showed that perceived ease of use, perceived critical mass, perceived enjoyment, and perceived information intelligence have a positive and a significant effect towards perceived usefulness. Perceived usefulness also has a positive and significant effect on users' attitude, and users' attitude has a positive and significant effect on intentions to use Facebook continuously among its users. Conclusions: Hence, it is important for Facebook as an online information distribution channel to maintain its perceived usefulness in order to create a positive impact on its users' and induce Facebook users' to use social media continuously.

• 산경연구논집
• /
• 제14권12호
• /
• pp.11-21
• /
• 2023

Purpose: This study aims to investigate the impact of mobile shopping app components on shopping flow and the continuous usage intention of the shopping apps in the rapidly growing mobile market facilitated by advancements in the mobile environment. Research Methodology: A survey was conducted, targeting users aged 20 and older with experience in using mobile shopping apps. The responses of 456 participants were analyzed through frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, and structural equation modeling. Results: The study found that within the components of mobile shopping apps, enjoyment significantly impacted both shopping flow and the continuous usage intention of shopping apps. The diversity of product assortment had a significant effect only on shopping flow. The usefulness and ease of use influenced on the intention to continue using shopping apps. Conclusions: Based on the findings, it is recommended that shopping app operators try to identify essential components for stimulating user interest and engagement when developing or modifying apps. Additionally, a diverse range of products enhances the shopping experience and drives spontaneous purchases. Furthermore, providing an easy interface and minimizing the effort required, this experience can enhance user perception of its value and sustain consumers' continuous usage intention of the shopping app.

• Journal of applied mathematics & informatics
• /
• 제28권1_2호
• /
• pp.515-521
• /
• 2010

In multivariate analysis, the inversion formula of the Stieltjes transform is used to find the density of a spectral distribution of random matrices of sample covariance type. Let $B_n\;=\;\frac{1}{N}Y_nY_n^TT_n$ where $Y_n\;=\;[Y_{ij}]_{n\;{\times}\;N}$ is with independent, identically distributed entries and $T_n$ is an $n\;{\times}\;n$ symmetric non-negative definite random matrix independent of the $Y_{ij}$'s. In the present paper, using the inversion formula of the Stieltjes transform, we will find that the limiting distribution of $B_n$ has a continuous density function away from zero.

• 응용통계연구
• /
• 제21권4호
• /
• pp.659-664
• /
• 2008

Missing continuous covariates are pervasive in the use of generalized linear models for medical data. Multiple imputation is the most common and easy-to-do method of dealing with missing covariate data. However, there are always serious warnings in using this method. There should be concern to make imputed values more proper. In this paper, proper imputation from posterior predictive distribution is developed for implementing with arbitrary priors. We use empirical distribution of the posterior for approximating the posterior predictive distribution, to sample from it. This method is preferable in comparison with a presented imputation method of us which uses a full model to impute missing values using available software. The proposed methods are implemented on glucocorticoid data.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제11권1호
• /
• pp.165-177
• /
• 2019

This paper considers corrosion wastage of two ship hull structure members as a part of investigated fuel oil tanks of 25 aging bulk carriers. Taking into account that many factors which influence corrosion wastage of ship hull structures are of uncertain nature, the related corrosion rate ($c_1$) is considered here as a real-valued continuous distribution, assuming that the corrosion wastage starts after 5, 6 or 7 years. In all considered cases, by using available data and applying three basic statistical tests, it is established that between two-parameter continuous distributions, normal, Weibull and logistic distributions are best fitted distributions for the mentioned corrosion rate ($c_1$). Note that the presented statistical, numerical and graphical results concerning two mentioned ship hull structure members allow to compare and discuss the corresponding probabilistic estimates for the corrosion rate ($c_1$).

• Kyungpook Mathematical Journal
• /
• 제48권3호
• /
• pp.411-417
• /
• 2008

In the present paper we derive the distribution of single order statistics, joint distribution of two order statistics and the distribution of product and quotient of two order statistics when the independent random variables are from continuous Kumaraswamy distribution. In particular the distribution of product and quotient of extreme order statistics and consecutive order statistics have also been obtained. The method used is based on Mellin transform and its inverse.