• Journal of the Korean Data and Information Science Society
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• 제25권1호
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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.

• 복식
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• 제35권
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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.

• 한국의류산업학회지
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• 제11권1호
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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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• 제20권4호
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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.

• 한국콘텐츠학회논문지
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• 제17권6호
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• pp.643-649
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• 2017

이 연구는 다중운집행사에 필요한 경찰력을 통원하는데 영향을 미치는 요인들을 비교하는 연구로서 안전한 다중운집행사를 진행하기 위하여 경찰력을 동원하는데 장애요인의 우선순위를 파악하여 경찰력 동원에 과학적인 근거를 마련하기 위한 목적을 가지고 있다. 다중운집행사는 많은 사람들이 특정한 장소에 집중적으로 모여들기 때문에 사소한 원인에 의하여 많은 피해가 발생할 수 있는 특성을 가지고 있다. 이러한 위험을 통제하기 위하여 경찰력을 동원하곤 하는데 위험을 유발할 수 있는 우선순위에 대한 기준은 아직 부족하여 이에 대한 분석이 필요하다. 이 연구에서는 다중운집행사의 안전에 위협에 영향을 미치는 요인을 행사 내부 위험요소, 행사 외부 위험 요소, 교통안전 위협요소로 분류한 기준과 함께 다중운집행사에 동원된 민간경비인력 수준과 참여자를 독립변수로 설정하여 2013년에서부터 2014년까지 동원된 경찰력을 종속변수로 하여 위계적 회귀분석으로 살펴보았다. 그 결과, 다중운집행사의 안전 확보를 위한 경찰력 동원에 가장 크게 영향을 미친 요인은 참가 인원이었으며, 그 다음으로 자체질서요원 인원, 경찰력 동원 사유가 영향을 미치는 것으로 나타났다. 따라서, 다중운집행사의 위험성은 참가인원의 규모가 큰 영향을 미치는 것으로 볼 수 있다.

• Communications for Statistical Applications and Methods
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• 제24권3호
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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.

• 한국컴퓨터정보학회논문지
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• 제14권2호
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• pp.9-16
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• 2009

광대역 네트워크의 발달과 함께 멀티미디어 산업의 발달은 IPTV와 같은 디지털 콘텐츠 시장의 확산을 가져오고 있다. 이러한 배경 속에서 멀티미디어에 대한 욕구를 만족시키기 위해 Time-Shift 시스템이 개발되었다. 이 시스템은 시간(Time)에 대한 독립적 특성만 강조되었기 때문에 장소(Place)와 상황(Occasion)에 대해서는 독립적이지 못하다. 이러한 문제를 해결하기 위해서 본 논문에서는 휴대용 멀티미디어 디바이스를 위한 TPO(Time, Place, Occasion)-Shift 시스템에 대한 설계를 제안한다. 휴대용 멀티미디어 디바이스에서 지원 가능한 프로파일과 일반 셋탑박스에서 지원 가능한 프로파일은 다르고, 휴대용 디바이스에서는 대용량의 멀티미디어 데이터를 무한정으로 저장할 수 없기 때문에 한정된 양의 데이터를 원하는 프로파일로 계속저장하는 것이 설계의 핵심이다. 따라서 보다 효율적인 버퍼 관리를 위해서 지정시간 단위의 바스켓을 구성하고, 바스켓의 파일이름에 시간정보를 삽입함으로써 새로운 콘텐츠 구성을 위한 DTS(Decoding Time Stamp) 정보로 파일이름을 사용할 수 있다. 따라서 트랜스코딩을 통하여 데이터 변환할 때, DTS정보를 이용하여 새로운 포맷의 콘텐츠를 휴대용 멀티미디어 디바이스에 구성할 수 있게 된다. 또한 바스켓 기반의 버퍼시스템를 이용하여 모바일 디바이스에 실시간으로 컨텐츠를 구성하고 셋탑박스내에서 메모리를 적게 사용한다. 본 논문에서 제안한 TPO-Shift시스템은 윈도우즈 비스타의 환경에서 다이렉트쇼(Directshow) 재생기를 이용한 셋탑박스, 그리고 휴대용 디바이스인 MS340 단말기로 구현하였으며, 실시간으로 TPO-Shift 시스템을 충분히 실행함을 확인할 수 있었다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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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.

• 대한수학회지
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• 제41권6호
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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.

• 한국보건간호학회지
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• 제31권3호
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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.