• 한국심리학회지 : 문화 및 사회문제
• /
• 제27권3호
• /
• pp.285-303
• /
• 2021

이 연구는 Różycka-Tran, Boski, Wojciszke(2015)이 Belief in a Zero-Sum Game (BZSG) 모델을 토대로 개발한 제로섬 신념 척도를 국내 성인들을 대상으로 신뢰도와 타당도를 검증하고자 하였다. 이를 위해 전국에 거주하는 508명의 성인(대학생 252명, 일반성인 256명)을 대상으로 제로섬 신념, 사회적 신뢰, 주관적 사회경제적 지위, 개인주의-집단주의 문화 성향, 사회비교 지향성 척도로 구성된 온라인 설문조사를 실시하였다. 탐색적 요인분석과 확인적 요인분석 결과, 한국판 제로섬 신념은 단일요인 구조를 가지고 있는 것으로 확인되었고, 신뢰도 분석 결과, 양호한 내적 일치도를 확인할 수 있었다. 한국판 제로섬 신념 척도는 사회적 신뢰와 주관적 사회경제적 지위와는 관련이 없는 것으로 나타났다. 그러나 제로섬 신념 척도는 수직적 개인주의와 수직적 집단주의 문화 성향과 정적 관계를 나타냈고, 수평적 집단주의 문화 성향과는 부적 관계, 수평적 개인주의와는 관련성이 나타나지 않았으며, 사회비교 지향성과는 정적 관계로 나타났다. 하지만 이러한 결과는 대학생 집단이나 일반 성인 집단이냐에 따라 차이가 있었다. 마지막으로 이 연구가 국내에서 제로섬 신념과 관련된 많은 연구를 촉진할 수 있음을 밝혔고, 제로섬 신념에 영향을 주는 요인들을 살펴보고 제로섬 신념으로 인해 나타날 결과들을 밝히는 후속 연구가 필요하다는 제언을 제시하였다.

• 전기학회논문지
• /
• 제57권6호
• /
• pp.972-981
• /
• 2008

A New ZVS(Zero Voltage Switching) and ZVZCS(Zero Voltage and Zero Current Switching) Three-Level Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the all switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provide ZVZCS conditions to primary switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2kW(27V, 74A) 40 kHz IGBT based experimental circuit.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
• /
• pp.227-231
• /
• 2001

A new primary-side-assisted zero-voltage and zero-current switching (ZVZCS) three-level DC-DC converter with flying capacitor is proposed. The three-level converters are promising in high voltage applications, and ZVZCS is a very effective means for reducing switching losses. The proposed DC-DC converter uses only one auxiliary transformer and two diodes to obtain ZCS for the inner leg. It has a simple and robust structure, and offers soft-switching capability even in short-switching conditions. The proposed converter was verified by experiments in a 6KW prototype designed for communication applications and operating at 100kHz.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제20권1호
• /
• pp.59-70
• /
• 2013

The purpose of this study was to develop a zero-inflated Rasch (ZI-Rasch) model, a combination of the Rasch model and the ZIP model. The ZI-Rasch model was considered in this study as an appropriate alternative to the Rasch model for zero-inflated data. To investigate the relative appropriateness of the ZI-Rasch model, several analyses were conducted using PROC NLMIXED procedures in SAS under various simulation conditions. Sets of criteria for model evaluations (-2LL, AIC, AICC, and BIC) and parameter estimations (RMSE, and $r$) from the ZI-Rasch model were compared with those from the Rasch model. In the data-model fit indices, regardless of the simulation conditions, the ZI-Rasch model produced better fit statistics than did the Rasch model, even when the response data were generated from the Rasch model. In terms of item parameter ${\lambda}$ estimations, the ZI-Rasch model produced estimates similar to those of the Rasch model.

• 응용통계연구
• /
• 제28권3호
• /
• pp.583-592
• /
• 2015

영-과잉(zero-inflation) 현상은 최근 계수(count) 시계열 분석의 주요토픽으로 다루어지고 있다. 본 논문에서는 영-과잉 계수 시계열의 변동성을 연구하고 있다. 기존의 정수형 모형인 INGARCH(integer valued GRACH) 모형에 조건부 포아송 및 조건부 음이항 분포를 사용하여 변동성에 영-과잉 현상을 추가하였다. 모수 추정 방법으로 EM알고리즘을 사용하였으며 국내 콜레라 발생건수에 적용시켜 보았다.

• 한국경영과학회지
• /
• 제3권2호
• /
• pp.47-74
• /
• 1978

This paper reviews the zero-base budgeting whose concept was developed in the late 1960's, and applied to the actual budgeting situations in the early 1970's. Since then, it has been expanded to become one of major tools in corporate planning and control system. The primary purpose of this review is to clarify the followings: 1) concept of zero-base budgeting and its history, 2) relationships among zero-base budgeting, planning and program evaluation, 3) comparison of zero-base budgeting with other budgeting techniques, and 4) implementation procedure. Some discussions are also provided with respect to the practical implications of zero-base budgeting, its advantages and disadvantages, and others. Finally, the possibility of actual application in a local setting is investigated.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2011년도 전력전자학술대회
• /
• pp.438-439
• /
• 2011

In this paper, soft switching bidirectional DC-DC converter is proposed. The proposed topology is added two auxiliary switches, two resonant capacitors and one resonant inductor to convectional bidirectional DC-DC converter. Therefore, this proposed topology can reduce switching loss of each power switch by ZVS (Zero Voltage Switching) and ZCS (Zero Current Switching). We have performed mode analysis, simulation and experiment for the proposed topology.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
• /
• pp.79-84
• /
• 1998

A novel zero voltage and zero current switching (ZVZCS) full bridge (FB) PWM converter with low output current ripple is presented. A simple auxiliary circuit added in the secondary provides ZVZCS conditions to primary switches, ZVS for leading-leg switches and ZCS for lagging-leg switches, as well as reduces the output current ripple (ideally zero ripple). The auxiliary circuit includes neither lossy components nor additional active switches which are demerits of the previously presented ZVZCS converters. Many advantages including simple circuit topology, high efficiency, low cost and low current ripple make the new converter attractive for high performance high power (＞1kW) applications. The principle of operation, features and design considerations are illustrated and verified on a 2.5kW, 100KHz IGBT based experimental circuit.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제48권6호
• /
• pp.342-348
• /
• 1999

A new welding machine which adopts zero voltage and zero current switching(ZVZCS) full bridge(FB) DC-DC converter is proposed. The proposed ZVZCS FB DC-DC converter uses auxiliary transformer to obtain ZCS for leading leg. It has capability of controlling load current even in short circuit condition and is suitable for arc welding machines. The power rating of the auxiliary transformer is about one 5th to one 10th of the main transformer. Experimental results for 10KW prototype are shown to verify the principle of operation.

• 응용통계연구
• /
• 제25권5호
• /
• pp.859-864
• /
• 2012

Poisson regression and negative binomial regression are usually used to analyze counting data; however, these models are unsuitable for fit zero-inflated data that contain unexpected zero-valued observations. In this paper, we review the zero-inflated regression in which Bernoulli process and the counting process are hierarchically mixed. It is known that zero-inflated regression can efficiently model the over-dispersion problem. Vuong statistic is employed to compare performances of the zero-inflated models with other standard models.