• The Bulletin of The Korean Astronomical Society
• /
• v.39 no.2
• /
• pp.56.1-56.1
• /
• 2014

Although the growth of structure, as traced by galaxy clusters, has been extensively studied through cosmological simulations and large-scale surveys, the early formation and evolution of their galaxy content, and its relation to the transformation of the host environment, are still somewhat poorly understood. This is particularly true of the processes that give rise to the quiescent galaxy population between z=3 and z=2. Recent discoveries at z~2 are now bridging the gap between the well-established massive clusters of the last 9 Gyr and the high-redshift universe, and new datasets are now giving us access to statistical populations of intermediate-mass structures at this epoch. I will discuss the properties of quiescent galaxies in the most distant confirmed X-ray detected galaxy clusters, their implications for galaxy quenching at high-redshift as well as the regulation of star formation at group scales at z~2.

• Proceedings of the Korea Association of Information Systems Conference
• /
• 1997.10b
• /
• pp.271-285
• /
• 1997

This paper address the issues of satisfaction factors to measure the service quality in computer communication service users. In order to develope a satisfaction factors' model, we study appropriate quality factors of the service through the focus group interviews with service users, and surveys the quality levels that users have felt in services. It also analyzes the relationship between the user's quality level and the quality factors by the statistical analyses. Based on the optimal regression model, we suggest an appropriate satisfaction model in PC communication service areas. That model shows that most users are interested in the fare for use. Use-fare factor is the most powerful one to the satisfaction model. Second one is usefulness, next is correctness. But connect-status factor is the only negative one. Most users think that its factor is in the way of fluent communication. So to keep the competitiveness in the PC communication service, the sixth negative factor should be modified as soon as possible.

• Asia pacific journal of information systems
• /
• v.12 no.3
• /
• pp.169-189
• /
• 2002

In this study, we newly classify services and service products in EC into Mass Service, Interactive Service, Ordering Service, and Professional Service. For classification, five selected variables and two factorized dimensions such as 1) ease of on-line interaction and 2) needs of on-line interactions are used. On the result of classification, we investigate the relationships with customer purchase intentions in EC. For this purpose, customer surveys were conducted on the respondent groups who are known to be frequent purchasers in EC and have advanced knowledge on services and service products. The survey is analyzed by statistical methods such as factor score plot, cluster analysis, analysis of variance, etc.

• Journal of the Korean housing association
• /
• v.19 no.2
• /
• pp.63-72
• /
• 2008

In general, the function of university dormitory includes residental, educational and many other functions for students who need quite environment and energetic living life. This functions influence the residental satisfaction of university dormitory. So this study attempts to evaluate many functions of the D-university dormitory according to the residents (students) needs and satisfaction. In the present work, SPSS window version 12.0 programs Anova (duncan, scheff, T-test. etc.) was used for analysis of statistical data which obtained from survey. The field surveys carried out for a total samples of 159 residents such as male (86), female (73), in the D-university dormitory. The result appears that the most dissatisfied factor of resident was the space and facilities of wash room. and students demand that various room and program in the dormitory except main space (unit room).

• The Korean Journal of Applied Statistics
• /
• v.16 no.2
• /
• pp.225-237
• /
• 2003

We analyze the factors leading to discrepancy in estimators and predictors of e-commerce size each survey institution, and then we make a evaluation criterion to obtain objective and standard results in e-commerce surveys. We would like to guarantee reliability for e-commerce statistics published by the survey institutes and the public ones by adapting the criterion which suggested.

• Journal of Korean society of Dental Hygiene
• /
• v.7 no.4
• /
• pp.433-439
• /
• 2007

This paper describes biomedical ethics problem perception in dental hygiene students. Questionnaire surveys were conducted for 285 in dental hygiene students from September 3th to 21th of 2007. For statistical analyses of collected data, the descriptive analyses and chi-square were adopted. This collected data showed that bribery as the most common ethical problem. Other frequently mentioned problems are unkindness of patient and treatment equality. They agreed to artificial abortion in 79.1%, human cloning was statistically significant by grade. Biomedical ethics problem except euthanasia and human cloning were statistically significant by resident area. Also, brain death was statistically significant by religion.

• Journal of the Korean housing association
• /
• v.19 no.1
• /
• pp.67-77
• /
• 2008

In general, the function of university dormitory includes residental, educational and many other functions for students who need quite environment and energetic living life. Among these many functions, the most important function is residental function (bed room). This study attempts to evaluate the bed room environment of four university dormitories in north region of Gyeongbuk Province using resident's (students) need and satisfaction. In the present work, SPSS window version12.0 program's Anova (duncan, scheff, t-test.) was used for analysis of statistical data which obtained from survey. The field surveys carried out for a total samples of 473 residents such as AD (118), DY (159), Kw (101) and SJ (95)) types of bed room in four university dormitories. The result appears that the most dissatisfied factor of resident was personal privacy, and the most satisfied factor was the direction (location) of bed room space.

• Journal of the Korean Dietetic Association
• /
• v.6 no.1
• /
• pp.26-32
• /
• 2000

The purposes of this study were to assess the importance and performance level of nutrition service in views of industrial employees and to explore the ways to improve the nutrition service quality. A survey of industrial foodservice operations located in Korea was undertaken and detailed information was collected from each, including surveys of 994 industrial employees. Statistical data was analysed by SAS PC 6.04 for descriptive analysis, t-test, and analysis of variance. The whole industrial employees assessed the importance and performance of the dieticians' role on nutrition service as '4.03' and '3.32' out of 5 respectively, which suggests that the industrial nutrition service needs to be improved. The variables which received higher scores than the average mean were safe meal provision, sanitation management and equipment & facilities management, whereas the score of individual nutrition counselling was low compared to other variables of nutrition service. The groups who scored low performance were characterized by labor work, experience with less than 10 years, single, aged below 29 years old, and female.

• Survey Research
• /
• v.1 no.1
• /
• pp.21-43
• /
• 2000

Although telephone surveys are an attractive alternative to household interviews it is important to determine whether the data collected by the two methods are comparable. To answer this question, findings from the telephone survey literatures are examined in the view point of i) direct effect which means expressions of preference of the interview detail of answers on open questions and item missing data rates ii) statistical estimates and iii) differences of interviewers and data collection modes. Differences are explained by social desirability effects on the telephone, cognitive ability of the survey question, and mode effects and interviewer effects.

• IE interfaces
• /
• v.9 no.3
• /
• pp.120-142
• /
• 1996

Asynchronous Transfer Mode (ATM) is considered to be the most promising transfer technique for BISDN due to its efficiency and flexibility. Queueing theory has been playing a very important role in performance evaluation of ATM for the past few years. This paper is composed of two parts. The first part is concerned with the several basic concepts of ATM. The second part surveys queueing approaches in ATM performance evaluation. It deals with stochastic models which have been proposed for the three basic categories of traffic sources (voice, data, video), various queueing models for statistical multiplexer and switch, and priority strategies for buffer control schemes.