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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.
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.
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.
팽창펄라이트를 사용한 콘크리트의 특성에 관한 실험적 연구
전현규(Jeon Hyun-kyu),서치호(Seo Chee-Ho),김대희(Kim Dae-hoi) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Improve thermal insulated in structure of building and examination of development existing material of material that can improve performance of structure is required. There is expanded perlite that is having special quality suitable material to be used for composition material of building in various characteristic such as lightweight, incombustible, thermal insulation, sound absorption in this research. But, is used circumscriptively. Therefore, was going to apply to concrete and estimate the performance. Hereafter, I wished to recognize about practical use of expanded perlite as insulating lightweight concrete aggregate. Result that execute a concrete experiment that use in fine aggregate is as following. 1. According as the mixing rate increases 15% as result that average 2.25㎝ of slump value decreased. Air content was expose that 0.3∼0.4% increases. 2. Unit weight decreased by unit of average 23㎏/㎥ and 10㎏/㎥ according as increase by mixing rate 15% of expanded perlite. Improvement effect that is high more than wet condition that test piece gets into dry is expected. 3. Concrete compressive strength that use expanded perlite in fine aggregate expressed Compressive Strength of 248∼259kgf/㎠ in mixing design 210kgf/cm2. 240kgf/㎠'s mixing design expressed Compressive Strength of 290∼316kgf/㎠. Expressed higher value than 235kgf/㎠ and 279kgf/㎠ of standard mixing design. 4. Expanded perlite mixing rate rises, concrete compressive strength and tensile strength were fallen. Therefore, Choice of correct suitable mixing design to need in practical use usage. 5. Thermal conductivity is decrease average 0.059∼0.067㎉/mh℃ according as increase by mixing rate 15% of expanded perlite.
국내성인에 있어서 우울증이 자살생각에 미치는 영향에 관한 실증연구
전현규(Hyeon Gyu Jeon),심재문(Jae Mun Sim),이건창(Kun Chang Lee) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.7
자살생각은 자살행위의 초기 결정요인으로써 자살시도의 중요한 예측 인자이다. 그런데, KNHANES (국민건강영양조사) 자료를 분석한 선행연구에서는 자살 위험에 따라 대상 집단을 정하고 그 집단에 대한 구체적인 연구들은 활발하게 이루어진 반면, 우리나라 성인을 대상으로 한 연구는 미흡한 실정이다. 뿐만 아니라, 우울증 경험 유무에 따른 자살생각 위험요인 간의 관련성을 실증적으로 분석한 연구는 충분하지 않다. 따라서 본 연구에서는 국민건강영양조사(KNHANES) 자료를 바탕으로, 우리나라 성인들의 연령대별 자살생각 관련 위험요인을 밝히고, 더 나아가 우울증이라는 감성요인의 경험과 자살생각 위험요인 간의 관련성을 실증적으로 분석하고자 한다. 이를 위해 국민건강영양조사(KNHANES) 제4기(2008~2009년) 및 제5기(2010~2012년)의 최근 5년치 자료를 이용하여 자살생각 영향요인을 분석하였다. 성별에 따른 자살생각의차이는 청·장년층, 중년층, 및 노년층 모두에서 통계적으로 유의하게 나타났다. 전체적으로 모든 연령층에서 남성보다 여성이 자살생각을 크게 가지며, 연령으로 비교해보면 노년층이 청·장년층이나 중년층보다 자살생각을 크게 갖는 것으로 분석되었다. 우울증은 모든 연령층에서 자살생각과 긴밀한 관계가 있음이 확인되었다. Suicidal ideation has received much attention from both practitioners and researchers as Korean society becomes aging and individualistic. However, previous researches on the suicide ideation have focused on young generations instead of adults who seem to be more suffered from economic pressure and all kinds of exterior environments causing depression. Besides, there were research voids in the suicidal ideation area where depression was never taken into consideration. In this sense, we attempted to launch empirical studies on analyzing explanatory factors relevant to suicidal ideation in all the age groups by using KNHANES dataset from 2008~2012 years. Especially, we further analyzed KNHANES dataset to know how much depression affects suicidal ideation. Empirical results showed that depression is in a significant relationship with the suicidal ideation in all the demographic dimensions such as age, education, living area, etc.
전현규 ( Jeon Hyun-kyu ),임진규 ( Lim Jin-kyu ),서치호 ( Seo Chee-ho ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.3
In this study, study about fly ash and blast-furnace slag used as substitutive materials for cement, and the influence on the neutralization of high flow concrete durability with these substitutive materials was performed and analyzed. The results are as follows 1) Aggregate segregation was partially improved with the progress of the admixture input at the mix proportion above slump flow 65 cm 2) Compressive strength with the progress of the increasement of fly ash input was decreased in early age, but decrease range was improved in long term age. Also, in case of blast-furnace, similar or improved compressive strength was appeared. 3) The neutralization depth with fly ash input was noticeably increased. But blast-furnace slag was effective to prevent. 4) In this experiment, high powder content was advantageously affected on preventive effect of the neutralization, and the relationship between the compressive strength and the neutralization depth was inversely proportional.