• 프린팅코리아
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• s.20
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• pp.152-154
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• 2004

21세기를 사는 우리네 자화상이다. 하루종일 휴대전화, 이메일, 메신저를 통해 대화하고 확인한다. 정보화시대를 사는 우리는 디지털 세상에 단단히 접속되어 있음을 수시로 확인해야 직성이 풀린다. "나는 접속한다. 고로 존재한다"라는 명제는 진부할 정도다. 존재의 당위를 넘어 가히 집착의 수준이다. 디지털 문명의 노예가 되어버린 것이다. 20세기는 '접속' 이라는 단어가 모든 것을 가능케 해 줄 것만 같았던 시기였다. 21세기가 되자 접속이 중독을 낳는 상황이 초래되었다. 바로 이 지점에서 문제가발생한다. 인간의 심성구조, 생활패턴에서부터 사회구조에 이르기까지 우리 사회가 디지털 문명의 소용돌이에 휘몰리는 상황, 이른바 디지털 신드름에 빠지게 된 것이다. 그 속에서 살아가는 우리는 디지털 피로, 디지털 스트레스를 만성적으로 겪고 있다.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2001.05a
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• pp.132-132
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• 2001

Vitellogenin은 난황단백질의 전구체로서 생체내 발현은 에스트로젠과 에스트로젠 수용체가 반응함으로써 활성화되는 것으로 알려져 있다. 어류의 경우 간에서의 vitellogenin의 합성 및 분비는 성숙된 암컷에서만 일어날 수 있는 현상이나, 과거 여러 실험 결과를 바탕으로 수컷이나 미성숙한 암컷에서도 에스트로젠성 물질에 의해 합성이 유도되는 것으로 밝혀졌다. 따라서 수컷 또는 치어 plasma에서 vitellogenin의 측정은 외인성에스트로젠에 대한 노출을 평가할 수 있는 좋은 수단이 될 수 있다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.778-780
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• 2004

CG 기술의 발전으로 실사 이미지 위에 3d 애니메이션을 적용하는 실감나는 영화를 많이 볼 수 있다 그러나 아직까지도 실사 이미지와 3d 애니메이션 합성은 그래픽 아티스트의 수작업이 많이 필요하다. 본 논문에서는 자연 환경을 포함하는 실사 비디오에서 영상 분석 기법을 적용한 혼합 현실 시스템을 제안한다. 비디오 프레임에서 하늘, 바다 등 일정한 칼라 패턴을 가지는 영역을 분류하고 이 영역에 대해서 그래픽 객체를 삽입한다. 시스템의 각 단계에서 사용자 인터페이스를 제공하여 필요한 입력값을 제공받는다. 본 연구에서의 기법은 간단한 그래픽 입력 과정 이외에는 대부분의 과정이 자동으로 처리되므로 혼합 현실이 방송, 영화 특수 효과 등의 작업에 편리하게 이용될 수 있다.

• Korean Journal of Construction Engineering and Management
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• v.23 no.2
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• pp.95-101
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• 2022

This study attempts to identify the ways of reducing the floor impact sound, by applying six different types of the reinforced bar girders and stirrup arrangements to the Structure: (1) the longer-direction girder arrangements (2) the shorter-direction girder arrangements (3) the diagonal-direction arrangements (4) the longer-direction girder arrangements with stirrups (5) the shorter-direction girder arrangements with stirrups (6) the diagonal-direction arrangements with stirrups. In order to identify the most effective structural changes, each slab was tested with bang machines, measuring the level of the sound impact. The results showed that the longer-direction girder arrangements with stirrups were the most effective one. In addition, the effectiveness of slab was found to be remarkable, showing the level of minimum 1dB to maximum 5dB, where the slab was compared with the control models without girders and stirrups. In conclusion, it is suggested that the longer-direction girder arrangements with stirrups could possibly be applied to the Wall Structures to minimize the floor impact sound.

• Journal of dental hygiene science
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• v.15 no.5
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• pp.679-687
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• 2015

The purpose of this study was to examine the job stress and psychosocial stress of dental hygienists and risk factors related to psychosocial stress. The subjects in this study were 349 dental hygienists in dental hospitals and clinics located in Jeonbuk Province. A self-administered survey was conducted, and the collected data were analyzed. The findings of the study were as follows: The median of their total scores in job stress was 46.0, and the average of psychosocial stress scores was 23.67. As a result of analyzing their demographic characteristics and psychosocial stress, many of the respondents who were younger, who had less working experience and who drank once or twice a week belonged to the high-risk group of psychosocial stress (p<0.05). Concerning the relationship between job stress and psychosocial stress, many of the respondents who suffered from heavier job stress belonged to the high-risk group of psychosocial stress (p<0.05). The group whose occupational climate was less stressful was 3.6-fold more likely to belong to the high-risk group of psychosocial stress than the other whose workpalce culture was more stressful before the correction of the data, and the former was 3.4-fold more likely to do that than the latter after that. The group whose total score in workplace stress was higher was 2.3-fold more likely to belong to the high-risk group of psychosocial stress than the other whose workplace stress was lower before the correction of the data, and the former was 2.7-fold more likely to do that than the latter after that. Given the findings of the study, the development of job stress management programs is required, and everybody should make sustained self-management efforts to relieve their own stress and try to get rid of it in their own way.

• Composites Research
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• v.16 no.5
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• pp.7-14
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• 2003

Modeling of thick composite structures for finite element analysis is relatively complicated. 2-D plane elements may cause inaccurate result since the plane stress condition cannot be applicable in these structures. Therefore a 3-D modeling should be used. However, the difficulty to model all the layers with different material properties and ply orientation arise in this case. In this paper, an equivalent modeling is proposed and numerically tested for analysis of thick composite structures. By grouping layers with same material and ply orientation, number of elements through the thickness is remarkably reduced and still the result is close enough to the one from a detail finite element model. MSC/NASTRAN and PATRAN are used for the analysis. The proposed modeling technique has been applied for analysis of composite rotor hub system designed by Korea Aerospace Research Institute(KARI). Using the proposed equivalent modeling technique, we could conduct stress analysis for the hub system and check the safety factor of each part.

• Science of Emotion and Sensibility
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• v.20 no.2
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• pp.45-58
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• 2017

The present study tested a hypothesis that mood awareness and emotional expressivity would attenuate the association between academic stress and adjustment. In support of the hypothesis, the present research showed that emotional expressivity moderated the association between academic stress and adjustment among college students. That is, the association was attenuated by emotional expressivity when academic stress was high more than when academic stress was low. Curiously, we also identified an interesting diversion between two factors of mood awareness. Specifically, mood monitoring moderated the negative association between academic stress and adjustment, whereas mood labeling did not. That is, mood monitoring was particularly effective when academic stress was high, but mood labeling showed substantial benefits regardless of the level of academic stress. Overall, the present results suggest that mood awareness (in particular, mood labeling) and emotional expressivity serve as cognitive and behavioral protective factors that can buffer academic stress among college students.

• Journal of Venture Innovation
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• v.3 no.1
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• pp.87-99
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• 2020

This study empirical analysed how student's major satisfaction affected job-seeking stress. It also analysed the mean differences of major satisfaction and job-seeking stress between two groups(IPP experienced, non-experienced groups). 200 data were collected from the field survey questionnaires administered to a quota sample of university students who had IPP experience or non-experience. For hypothesis testing, the IBM SPSS Statistics 24.0 was used. As a result of empirical research analysis, first, it was found that major satisfaction had a negative effect on job-seeking stress. Among major satisfaction sub categories, subject satisfaction had negative effects on cognitive and physical stress, and relationship satisfaction also had negative effects on cognitive and physical stress. On the other hand, general satisfaction had a negative effect only on emotional stress. Second, there was a significant difference between major satisfaction and job-seeking stress. Major satisfaction of IPP experience group was high, and the job-seeking stress was low. Third, in the group of students who practiced IPP, subject satisfaction had a negative effect on emotional and physical stress, whereas subject satisfaction in the group of students who did not practice IPP had no significant effect on job-seekingt stress. In the case of relationship satisfaction, only non-practice groups had a negative effect on cognitive stress and physical stress. In the case of general satisfaction, only the IPP group showed negative effects on emotional stress. The results of this study supported the preceding studies that major satisfaction had an effect on job-seeking stress, and the study was meaningful in that it confirmed that there were differences between the IPP experienced, non-experienced groups. Based on this results, academic and practical implications were suggested.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.2
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• pp.206-210
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• 2008

The most noticeable aspect of progressive streaming is the media playback during its download through TCP to avoid a lengthy wait for a content to finish downloading. By employing TCP, it is usually possible to detect lost packets by using the checksum and sequence numbering functions of TCP Thereafter, we can recover the lost packets by the retransmission function of TCP. However, there must remain enough amount of media data in the recipient buffer in order to guarantee seamless media playback even during retransmission. In this paper, we propose an efficient algorithm for determining the initial buffering time before start of playback to guarantee seamless playback during retransmission considering the probability of client buffer under-flow. The effectiveness of the proposed algorithm will be proved through extensive simulation results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.437-442
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• 2001

Recently, transformerless inverters have been studied to reduce sizes and costs of utility-connected PV systems. This paper presents a transformerless PV inverter using a two-phase boost converter of reduced ripples in input current and output voltage, low voltage stress of semiconductor device and reduced size of input reactor. And new PWM method is introduced, whose on-off time is calculated from simultaneous equation induced by fourier series. To verify a validity of the proposed transformerless inverter, computer simulation has been carried out.