• Journal of the Korean Data and Information Science Society
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• v.25 no.1
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• pp.263-269
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• 2014

When the loss of samples appears under repeated surveys, new samples can often replace missing values. Estimators using response probability can be considered under repeated surveys on two occasions where new samples are selected instead of missing data on the second occasion. We propose a new estimator that uses both respondents and new samples on the second occasion. It is considered for the simulation setting that missing values can happen at the second occasion and are replaced by new samples. We can see that the proposed estimator is more efficient than that using a weighting adjustment method for respondents at the second occasion.

• Journal of the Korean Society of Costume
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• v.35
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• pp.253-264
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• 1997

Han-Bok presents a unique consumption ex-perience different from Western dress which is common to our clothing life. This study is intended to propose the necessity of broad-ening deepening and systematizing a research related to the social aspects of Han-bok. A questionnaire consisted of 10 statements of attitude to Han-Bok 7 statements of the evaluation of the occasional appropriateness of Han-Bok preference questions about style color harmony and decorative materials of han-Bok was developed which includes 5 opinion statement of the importance of tra-ditiona and some demographic variables. During December 1996 and January 1997 the women aged above 20 responded to it and finally 702 data was analyzed. Korean urban women have positive attitude to Han-Bok And the conceit about Han-Bok was significantly higher than the intention to wear it . The most properly evaluated occasion for wearing han-Bok was 'holdays' like Seolnal and chuseok Han-Bok was evaluated im-proper for casual wear and out wear. Factor analysis of 7 occasions determined 3 factors; traditional occasion special occasion and cas-ual occasion. It is needed to identify the ef-ficiency of Han-Bok according to each differ-ent occasion. Korean urban women preferred the style of traditional line soft color and modern har-mony. In a viewpoint of tradition they put more importance in the line of Han-Bok that they do in the color of it.

• Fashion & Textile Research Journal
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• v.11 no.1
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• pp.156-165
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• 2009

The purpose of this study was to compare men's hair style preference by gender according to occassion. Data were collected through a survey of 149 males and 175 females and analyzed by SPSS packages. The results of this study were as follows : 1) Male prefers to short, straight and black hair while female prefers to shot, nature wave and black hair. 2) Both male and female don't prefer to permanent and hair dyeing. 3) On the occasion of job interview, both male and female prefer to short, straight and black hair. On the occasion of blind date, male prefers to short, straight and black hair while female prefers to short, natural wave and natural brown hair. On the occasion of matchmaker meeting for marriage, male prefers to short, straight and black hair while female prefers to short, natural wave and dark brown hair. On the occasion of club party, male prefers to middle length, straight and black hair while female prefers middle length, natural wave and natural brown hair. On the occasion of leasure time, male prefers to short, straight and black hair while female prefers to short, natural wave and natural brown hair. And both male and female prefer to use hats for skin protection during outdoor leasure time.

• Communications for Statistical Applications and Methods
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• v.20 no.4
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• pp.247-257
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• 2013

A variety of practical problems can be addressed in the framework of rotation (successive) sampling. The present work presents a sample rotation pattern where sampling units are drawn on two successive occasions. The problem of estimation of population variance on current (second) occasion in two - occasion successive (rotation) sampling has been considered. A class of estimators has been proposed for population variance that includes many estimators as a particular case. Asymptotic properties of the proposed class of estimators are discussed. The proposed class of estimators is compared with the sample variance estimator when there is no matching from the previous occasion. Optimum replacement policy is discussed. Results are supported with the empirical means of comparison.

• The Journal of the Korea Contents Association
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• v.17 no.6
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• pp.643-649
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• 2017

This research is to compare factors which influence to mobilize police force necessary for crowd gathering occasions, and the purpose of this research is to prepare scientific basis for mobilization of police force by understanding order of priority of obstructive factors to mobilize police force for progressing safe crowd gathering occasions. Crowd gathering occasion has a characteristic that minor cause can lead to huge damage because many people concentrically gather at a specific place. In order to control these risks, it is necessary to analyze criteria on order of priority which can arouse risk to mobilize police force. In this research, I classified the factors influencing safety of crowd gathering occasion as internal risk factor, external risk factor and traffic safety threatening and set up the level of private security manpower and participants mobilized to crowd gathering occasion as independent variable and set up mobilized police force from 2013 to 2014 as dependent variable and analyzed it hierarchical analysis. From the result of analysis, the biggest influence to mobilization of police force for crown gathering occasion was the number of participants, and next self order-keeping agents and reason of mobilizing police force. Based on the result of analysis that the biggest factor to mobilize police force to crowd gathering occasion is the number of participants, it can be resulted that the number of participants influence to the risk of crowd gathering occasion.

• Communications for Statistical Applications and Methods
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• v.24 no.3
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• pp.255-269
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• 2017

This article explores the analysis of longitudinal surveys in which same units are investigated on several occasions. Multivariate exponential ratio type estimator has been proposed for the estimation of the finite population median at the current occasion in two occasion longitudinal surveys. Information on several additional auxiliary variables, which are stable over time and readily available on both the occasions, has been utilized. Properties of the proposed multivariate estimator, including the optimum replacement strategy, are presented. The proposed multivariate estimator is compared with the sample median estimator when there is no matching from a previous occasion and with the exponential ratio type estimator in successive sampling when information is available on only one additional auxiliary variable. The merits of the proposed estimator are justified by empirical interpretations and validated by a simulation study with the help of some natural populations.

• Journal of the Korea Society of Computer and Information
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• v.14 no.2
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• pp.9-16
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• 2009

While the broadband network and multimedia technology are being developed, the commercial market of digital contents as well as using IPTV has been widely spreading. In this background, Time-Shift system is developed for requirement of multimedia. This system is independent of Time but is not independent of Place and Occasion. For solving these problems, in this paper, we propose the TPO(Time, Place, Occasion)-Shift system for mobile multimedia devices. The profile that can be applied to the mobile multimedia devices is much different from that of the setter-box. And general mobile multimedia devices could not have such large memories that is for multimedia data. So it is important to continuously store and manage those multimedia data in limited capacity with mobile device's profile. Therefore we compose the basket in a way using defined time unit and manage these baskets for effective buffer management. In addition. since the file name of basket is made up to include a basket's time information, we can make use of this time information as DTS(Decoding Time Stamp). When some multimedia content is converted to be available for portable multimedia devices, we are able to compose new formatted contents using such DTS information. Using basket based buffer systems, we can compose the contents by real time in mobile multimedia devices and save some memory. In order to see the system's real-time operation and performance, we implemented the proposed TPO-Shift system on the basis of mobile device, MS340. And setter-box are desisted by using directshow player under Windows Vista environment. As a result, we can find the usefulness and real-time operation of the proposed systems.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.10a
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• pp.498-501
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• 1999

Grinding machine rotating at high speed express the unbalance by the spindle and the weight of grinding wheel. Therefore, the parts requiring a precision processing for grinding machine need acutely to establish of automatic balancer. But the more wheel speed increases the more vibration amplitude increases, surface roughness show the satisfactory according to increase of the wheel speed. Surface roughness of the occasion installing the automatic balancer made better than an occasion no installing the automatic balancer.

• Journal of the Korean Mathematical Society
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• v.41 no.6
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• pp.1035-1047
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• 2004

In this paper, we study the unit tangent sphere bundles T$_1$M(4c) of complex space forms M(4c) with constant holomorphic sectional curvature 4c. In particular, we determine T$_1$M(4c) whose Ricci tensors satisfy the Einstein-like conditions.

• Journal of Korean Public Health Nursing
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• v.31 no.3
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• pp.478-491
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• 2017

Purpose: This study was conducted to determine whether alcohol drinking patterns (drinking frequency, drinking quantity, binge drinking frequency and risk drinking) were related to obesity and abdominal obesity. Methods: A total of 6,749 adult men from the sixth Korea National Health and Nutrition Examination Survey were evaluated. Multivariate logistic regression analyses were employed to determine if obesity and abdominal obesity was associated with alcohol consumption patterns after adjusting for covariates. Results: No relationship was observed between drinking frequency and obesity. The odds ratio vs. nondrinkers for obesity was significantly low for individuals who consumed 5 to 6 drinks per typical occasion and monthly binge drinking. However ${\geq}7$ drinks per typical occasion resulted in a significantly higher odds for obesity relative to nondrinkers. The odds ratio vs. nondrinkers for abdominal obesity was significantly lower in response to monthly binge drinking, whereas ${\geq}10$ drinks per typical occasion and daily binge drinking resulted in significantly higher odds for abdominal obesity. Risk drinking had higher odds for abdominal obesity than non-risk drinking. Conclusion: Although moderate alcohol drinkers have a lower prevalence of obesity and abdominal obesity than nondrinkers, higher drinking quantity and frequent binge drinking are indicators of a higher prevalence of obesity and abdominal obesity in men.