고유동콘크리트의 특성에 관한 실험적 연구

전현규,김대회,이종찬,지석원,유택동,서치호,Jeon, Hyun-Kyu,Kim, Dae-Hoi,Lee, Jong-Chan,Ji, Suk-Won,Yoo, Taek-Dong,Seo, Chee-Ho 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.2

In this research, we used fly-ash and blast-furnace slag as substitute material of cement and fine aggregate, and we, through experiments, researched and analyzed the features of high-flowable concrete added high efficiency AE water reduction agent. The results are below. 1. Liquefaction generally presented high-slump flow value; on the other hand, partial segregation was observed in case of mixing proportion with 65 cm slump flow and above. This segregation was partially improved in accordance with mixing admixture. 2. Compressive strength according to mixing admixture and increasing mixing ratio of fly-ash were subject to be declined when it was initially cast-in, but its gap was improved when time was fully passed. 3. After mixing blast-furnace slag and fly-ash as substitute material, the result showed that the modulus of elasticity against freezing & melting was improved according to mixing blast-furnace slag and also increased in accordance with increasing pulverulent-body volume. 4. According to increasing the mixing volume of fly-ash, the durability factor was deteriorated because compressive strength became lower as well as air content was decreased when it was initially case-in. 5. The minimum air content to secure durability was 3.7%, for that reason, we had better secure admixture such as air entraining agent when cast-in high-flowable concrete.

원자력배관 건전성평가 전문가시스템 개발(II) -시스템 개발 및 사례해석-

전현규,허남수,김영진,박윤원,최영환,Jeon, Hyeon-Gyu,Heo, Nam-Su,Kim, Yeong-Jin,Park, Yun-Won,Choe, Yeong-Hwan 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6

The objective of this paper is to develop an expert system called NPIES for nuclear piping integrity. This paper describes the structure and the development strategy of the NPIES system. The NPIES system consists of 3 part; the data input part, the analysis part and the output part. The data input part consists of the material properties database module and the suer interface module. The analysis part consists of the LEFM, CDFD, J/T, limit load modules and the 12 analysis routines for different cracks and loading conditions are provided respectively. Analysis results are presented to screen, printer and text file in the output part. Several case studies on circumferentially cracked piping were performed to evaluate the accuracy and the usefulness of the code. Maximum piping loads predicted by the NPIES system agreed well with those by the 3-dimensional finite element analysis. In addition, even if the material properties were not fully given, the NPIES system provided reasonable evaluation results with the predicted material properties inferred from the material properties database module.

콘크리트의 열전도도 평가

전현규,Jeon, Hyun-Kyu 한국콘크리트학회 2013 콘크리트학회지 Vol.25 No.6

파이로 충격 모사 시험 장치 주요 매개변수에 따른 SRS 분석

전현규,김문국,김민성,권영민,유예진,김인걸,Jeon, Hyeonkyu,Kim, Munguk,Kim, Minsung,Kwon, Yeongmin,Yu, Yejin,Kim, In-Gul 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.4

The pyroshocks can cause failure of electronics devices and structures. Metal-metal impact methods are utilized to simulate mechanical pyroshock, and to adjust the knee frquency of the SRS(Shock Response Spectrum) through resonant structures. In this paper, the major parameters of pyroshock simulation device which affect the SRS were examined. Through the Hertzian contact law and the modal characteristics of the resonant bar, it was found that the SRS is affected by the length and mass of a bar and various impact conditions such as velocity and mass of impactor. The characteristics due to the geometric parameters of a resonant bar was analyzed by performing FEA and also the resonant bar was designed and fabricated. Through the pyroshock simulation test, the characteristics of SRS due to the variation of impact parameters were examined.

차륜/레일 접촉손상 해석기법

전현규,이동형,문형석,Jeon, Hyeon-Gyu,Lee, Dong-Hyeong,Mun, Hyeong-Seok 한국전산구조공학회 2009 전산구조공학 Vol.22 No.2

차륜-레일 구름접촉에 의한 피로손상 연구동향

전현규,이동형,서정원,권석진,Jeon, Hyeon-Gyu,Lee, Dong-Hyeong,Seo, Jeong-Won,Gwon, Seok-Jin 한국철도학회 2008 한국철도학회지 Vol.11 No.4

Influence of individual emotions on intention to share knowledge in competitive online advice communities

전현규 ( Hyeon Gyu Jeon ),이건창 ( Kun Chang Lee ) 한국지식경영학회 2017 지식경영연구 Vol.18 No.1

This study proposed that a relationship exists between individual emotions and knowledge sharing (KS) intentions in competitive online advice communities. Through statistical analysis of 220 valid questionnaires collected from qualified community members, we found that individuals` intentions to contribute knowledge were enhanced by playfulness and reciprocity, while their intention to seek knowledge from others was facilitated significantly by needs fulfillment, sense of competition, and playfulness. In addition, we found that playfulness was a common factor that affected the intention to seek, as well as to contribute, knowledge. Specifically, playfulness was a highly significant individual emotion that affected both individuals` intention to contribute and seek knowledge, while reciprocity was significant primarily in individuals` intentions to contribute knowledge. Needs fulfillment and sense of competition were significant emotions that affected primarily individuals` intentions to seek knowledge. Interestingly, the factors that affected the intention to seek knowledge were consistent both in all participants and in the high-level fear group. However, in the low-level fear group, playfulness influenced KS intentions.

IMT-2000 이동 단말기를 위한 5-Channel DMA Controller의 FPGA 구현

전현규(Hyun-Kyu Jeon),이재경(Jae-Kyung Lee) 한국통신학회 2001 한국통신학회 학술대회논문집 Vol.2001 No.7

스트레스와 신체활동, 그리고 건강관련 삶의 질의 연관성에 대한 실증분석

전현규(Jeon, Hyeon Gyu),심재문(Sim, Jae Mun),이건창(Lee, Kun Chang) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.8

국내에서 이뤄진 건강관련 삶의 질 관련 연구는 대부분 신체활동과 질환 간의 관계를 살피거나, 스트레스나 우울증과 삶의 질 간의 관계만을 살피는데 한정되어 있었다. 그러나, 스트레스와 같은 감정상태가 신체활동을 통한 건강관련 삶의 질에 미치는 영향에 관한 체계적인 실증연구는 아직 이루어지지 않고 있다. 이에 본 연구에서는 2008~2013년도 국민건강영양조사(KNHANES)자료를 토대로, 스트레스와 신체활동에 따른 건강관련 삶의 질 간의 관련성을 분석하였다. 이를 위해 교차분석과 집단별 로지스틱회귀분석을 수행하였다. 분석결과, 스트레스 비경험 군에서 남녀 모두 고강도 신체활동에 비하여 저강도 신체활동 수행시 삶의 질 수준이 낮아졌다(남: OR=1.15 p<0.001, 여: OR=1.18 p<0.001). 그러나, 스트레스 경험군에서는 남자는 스트레스 비경험군과 동일하게 저강도 신체활동 수행시 삶의 질 수준이 낮아졌지만(OR=1.79 p<0.01), 여자의 경우에는 오히려 삶의 질 수준이 높아졌다(OR=1.18 p<0.05). 이를 통해 스트레스에 따라 신체활동 수준이 건강관련 삶의 질에 미치는 영향에 차이가 있음을 발견하였다. In literature, empirical studies investigating how stress affects HRQOL (health related quality of life) through physical activities are insufficient. In this sense, on the basis of KNHANES dataset for 2008 ~ 2013, we conducted an empirical study. Empirical results revealed that in the male group with stress experience, HRQOL was significantly influenced by age, household income, education, occupation, physical activity level. To do so, we adapt the chi-square analysis and the logistic regression analysis. Meanwhile, in the stress non-experience group, the low level activity has lower HRQOL than the high level activity(male: OR=1.15 p<0.001, female: OR=1.18 p<0.001). In the stress experience group, the male has the same pattern of effect compared to the stress non-experience group(OR=1.79 p<0.01). However, in the female, the low level activity has the higher HRQOL than the high level activity(OR=1.18 p<0.05). Therefore, we confirmed that physical activity has a different effect on HRQOL through stress experience.

온라인 커뮤니티에서 개인의 감정과 공동체의식(SOVC)이 사용자의 지식공유의도에 미치는 영향에 관한 실증연구

전현규(Hyeon Gyu Jeon),이건창(Kun Chang Lee) 한국경영학회 2015 經營學硏究 Vol.44 No.6

In the context of online knowledge sharing community, it is important to analyze why the community users want to share knowledge with others because the degree of such knowledge sharing intention is a key success factor to the community. This becomes more certain when it comes to the fact that the community users compete with other to get more timely and valuable information. Moreover, users emotions affect such knowledge intention significantly. Based on these facts, this study aims to investigate role of emotions on users knowledge intention in the online community. To add a sense of reality much more, we classified emotions into two groups- individual emotions and SOVC as organizational emotions. For the sake of individual emotions, we consider “enjoy helping”, “sense of reciprocity”, “self efficacy”, and “sense of competition”. As organizational emotions, we consider “sense of membership”, “integration and fulfillment of needs”, and “emotional connection”. For the purpose of empirical experiments, we collected 258 valid questionnaires from the online community users. For the sake of obtaining more realistic results, we divided the data into two groups- dataset with strong competition-oriented individuals, and dataset with weak competition-oriented individuals. Applying SEM (structural equation models) to each dataset revealed robust results containing a lot of implications for both researchers and practitioners. Major findings from analyzing the 258 valid questionnaires are as follows. First, an emotional factor motivating individuals intentions for knowledge sharing is an emotional connection from an organizational perspective. Second, emotional factors motivating individuals intentions for knowledge utilization are sense of competition from an individual perspective, and integration and fulfillment of needs from an organizational perspective. Third, there exist no emotional factors keeping individuals from knowledge contribution. Fourth, those emotional factors affecting individuals with strong sense of competition are identical with those emotional factors influencing organizational knowledge sharing except self-efficacy. Fifth, those emotional factors affecting individuals knowledge contribution intentions include “enjoy helping”, and “sense of reciprocity” from an individual perspective, and “sense of membership”, “emotional connection” from an organizational perspective. Sixth, those emotional factors affecting individuals knowledge utilization intentions include “self-efficacy”, and “sense of competition” from an individual perspective, and “integration and fulfillment of needs” from an organizational perspective. As future study issues, we present that consideration of negative emotions will behave as an crucial moderating variable for individuals to show significantly different level of intentions for knowledge sharing, knowledge contribution, and knowledge utilization. Besides, we will perform psycho-physiological experiments in which EEG, ECG, GSR, and fMRI methods will be adopted to investigate in-depth roles of negative and positive emotional factors in manipulating individuals intentions for knowledge sharing, contribution, and utilization in a number of intriguing decision-making contexts.