• The Journal of Society for e-Business Studies
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• v.16 no.4
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• pp.139-154
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• 2011

Recently Internet keyword search service providers tends to use CPC advertizement method rather than CPM method. However researches how much the CPC method is beneficial to advertisers than CPM method in certain perspectives are insufficient and not performed systematically. So this paper tries to do comparative analysis about the two methods by analyzing the real transactional DB data from an advertizement agency. Due to the difficulties of direct comparison between the two methods because of their different expose positions on the Web and different types of attributes in DB, we did some preprocessing step for the transactional data. From the result of analysis, the click rate of CPC is higher than CPM by 1.3% and the unit cost for the CPC per one click is lower than CPM method by 51 Won. It shows the CPC method is more effective than CPM method for advertizement from the point of advertizement effectiveness (CTR) and advertizement cost (CPC). We hope this research would give useful information to advertisers and marketing managers in making advertizement strategy, marketing decision and budgeting.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.1
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• pp.183-193
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• 2014

Korean personal data(information) protection law requires privacy policies post on every website. According to recent survey results, users' interests on these policies are low due to these policies' low readability and accessibility. This study proposes a layout that effectively conveys online privacy policy contents, and assesses its impact on information understandability, vividness, and recognition of users. Studies on privacy policies and layouts, media richness theory, social presence theory, and usability are used to develop the new layered approach. Using experiments, three major layouts are evaluated by randomly selected online users. Research results shows that information understandability, vividness, and recognition of privacy policies in the revised-layered approach are higher than those of in the text-only or table-based layouts. This study implies that employing visual guides like icons on privacy policy layouts may increase users' interest in those policies.

• Journal of the Society of Disaster Information
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• v.16 no.4
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• pp.658-669
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• 2020

Purpose: This study was conducted for Pohang citizens who experienced Pohang earthquake damage. The purpose of this study is to examine how these post-traumatic stress level affect post-traumatic growth and to examine the mediating effects of stress coping on the causal relationship between post-traumatic stress level and post-traumatic growth. Method: The survey was conducted for the citizens who experienced Pohang earthquake, and the survey data were statistically analyzed using the SPSS 25.0 program. Result: Post traumatic stress level has been shown to affect post traumatic growth. In addition, as a result of examining the mediating effect of stress coping method on the relationship among these variables, the problem solving center and the social support method had a mediating effect, but the evasion method did not mediate. Conclusion: The post-traumatic stress level caused by disasters such as earthquakes was found to be able to overcome the obstacle and grow after trauma, as the coping method is problem solving and social support.

• The KIPS Transactions:PartB
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• v.14B no.2
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• pp.119-126
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• 2007

This paper presents a study investigating the effects of VR learning style on user attention and memory. The study involved users performed the guided or unguided style learning in the virtual environment while user attention was measured through physiological sensors (EEG, ECG, and GSR) and an eye tracking system. The users experienced the five specific events in a virtual environment associated with different stimuli, while they were given more specific goals during the guided task whereas they were given more goal asking them to actively search for the interesting items during the unguided task. The subject's attentions workload, feelings, memories about VR experience were measured by using a variety of physiological sensors during the task, video analysis, and post test survey. The results showed that the unguided task followed by the guided task made a considerable learning effect by giving a preview effect to the user. Moreover, the guided task drew more user attention and mental workload than the unguided task did.

• Food Science and Preservation
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• v.24 no.7
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• pp.992-999
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• 2017

The purpose of this study was to investigate the effects of the Bambusae Caulis in liquamen (BCL) on blood circulation in animal models. Previous studies on BCL have shown effects on thrombolytic activity and angiotensin-converting enzyme (ACE) inhibitory activity. In the mouse model, the triglyceride content were 301.5 mg/dL in the high fat diet+BCL II 0.01% group, 289.2 mg/dL in the high fat diet+BCL II 0.05% group, which was significantly lower than the high fat diet group. The total cholesterol content was 311.9 mg/dL in high fat diet+BCL II 0.01% and 293.7 mg/dL in high fat diet+BCL II 0.01% 0.05%, respectively, which was significantly lower than the high fat diet group. The HDL-cholesterol level was 206.0 mg/dL for the high fat diet, 196.6 mg/dL for the high fat diet+BCL II, and 189.2 mg/dL for the high fat diet+BCL II. There was no significant difference between the 0.01% and 0.05% groups. The high-fat diet+0.05% group was significantly improved in the blood flow compare to the high fat diet and the high fat diet+0.01% group. Platelet aggregation inhibition ability was inhibited in the high fat diet+0.01% and 0.05% groups compared to the high fat diet group.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.4
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• pp.9-17
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• 2012

In this paper, we show the memory effect of the high-power amplifiers for wied-band signals, present a compensation method for the nonlinearity combined with memory effect, and analyze its performance. For the modeling and the compensation of the nonlinear high-power amplifier with memory effect, we investigate the Volterra series model, the Wiener model, and the Hammerstein model. As a compensator scheme, we propose a digital feedforward technique. Compared to analog feed-forward scheme, the proposed scheme has better stability and adaptability to the environmental changes. It has a simpler structure than the conventional digital nonlinear compensation schemes. The result of computer simulations using ADS of the Agilent shows that spectral re-growth is suppressed by more than 20 dB, which amounts to at least 10 dB back-off. Considering the compensation performance, implementation complexity, and convergence rate, we could conclude the Wiener model is most suitable for the proposed scheme.

• The Korean Journal of Financial Management
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• v.17 no.1
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• pp.283-306
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• 2000

최근 국내에서는 은행산업의 구조조정과 부실은행의 정리과정에서 은행합병이 실시되었다. 1998년 6월 5개 은행이 퇴출되었고 이들 은행의 우량자산과 부채는 계약이전 방식에 의하여 우량은행들에게 인수되었다. 이어 1999년 1월부터 상업은행과 한일은행이 한빛은행으로, 하나은행과 보람은행이 하나은행으로 그리고 국민은행과 한국장기신용은행이 국민은행으로 합병되었다. 1999년 9월에는 조흥은행, 강원은행 및 충북은행이 합병을 실시하였다. 본 연구에서는 최근 실시된 국내 은행간 합병의 효과를 살펴보기 위하여 합병시점을 전후하여 위험성과 수익성 및 비용효율성을 비교 분석하였다. 합병은행과 자산부채이전(P&A) 방식의 인수은행으로 표본은행을 구분하고 합병효과를 분석하였는데 합병은행의 경우 합병후 수익성이 대체로 증가하나 위험도 증가하는 것으로 나타났다. 자산부채이전방식의 경우 합병후 위험이 증가하였으며 수익성은 대체로 악화되는 것으로 나타났다. 비용효율성 분석에 있어서 합병은행의 경우 합병전 기간에 비용감소를 보였으나 합병후에는 뚜렷한 비용감소가 없었는데 자산 부채이전 방식의 인수은행은 합병후 비용감소를 보였다.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.497-498
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• 2015

Random PWM 방식은 기본파의 배수 고조파에 밀집된 성분을 광대역화할 수 있기 때문에 특정 주파수의 노이즈 감소 및 소음 저감 등에 효과가 있는 인버터 스위칭 방식이다. Random PWM을 구현하는 방법은 랜덤 변수를 생성하고 이를 이용하여 스위칭 주파수를 가변하거나, 인가되는 벡터의 위치를 변화시키는 등의 다양한 방법이 있다. 본 연구에서는 Random PWM 구현 방식, 랜덤 변수의 변동 주기, 랜덤 변수가 적용되는 크기 등의 차이에 따라 주파수 광대역화에 미치는 효과를 분석하였다. 이 결과로부터 구현을 위해 요구되는 조건에 따른 Random PWM의 효과를 비교할 수 있으며, 투입 비용 및 시스템 제한 조건 대비 최적의 Random PWM 방식을 선정할 수 있는 기준으로 활용될 수 있다.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.36S no.4
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• pp.23-31
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• 1999

본 논문에서는 Ka 밴드 위성시스템에서 가장 큰 신호감쇠 요인으로 작용하는 강우효과를 분석하고 그 보상 방안으로서 계층형 8-PSK 변조방식을 제안하였다. 동기복조를 가정한 이론적인 BER 성능과 국내 강우 데이터에 근거한 예상되는 수신신호 품질을 분석하고 기존의 계층형 16-QAM 변조방식과 제안한 계층형 8-PSK 변조방식간의 성능을 비교하였다. 강우강도 및 강우감쇠는 대수정규 분포함수를 이용하여 추정하고 수신신호 품질은 서비스 중단 확률, 평균 수신 SNR에 대해 분석하였다. 결론적으로 제안한 계층형 8-PSK 변조방식은 기존의 계층형 16-QAM 변조방식과 비교해서 전반적으로 매우 우수한 성능을 가짐을 확인하였다.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.509-518
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• 2019

This study was to examine the effects of social relations on school adjustment of in the middle school students on the mediating effect of stress coping style. The data of 3,406 middle school students in the study on '2016 Measurements of Korean Youth Competence and International Comparative Study III' by the NYPI were analysed. For data analysis, reliability analysis, correlation among variables, analysis of multiple linear regression analysis were conducted. The results of the study were: (1) social relations were found a key factor affecting the school adjustment of middle school students, (2) their social relations affected stress coping style, (3) stress coping style affected school adjustment, (4) stress coping style was proved to have the mediating effect between social relations and school adjustment. In conclusion, the implications and limitations were suggested for future research.