Interface Shear Strength at Joints of Ultra‑High Performance Concrete Structures

Young?Jin Kim,Won?Jong Chin,Se?Jin Jeon 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.6

When ultra-high performance concrete (UHPC) is fabricated as precast members such as in a UHPC segmental bridge, the joint design between the precast members can significantly affect the overall integrity and safety of the structure. Therefore, the structural behavior of the UHPC joint was experimentally investigated in this study with test variables including joint type, number and height of shear keys, type of filler, curing temperature, and lateral compressive stress. The UHPC considered in this study is the K-UHPC developed in Korea with a specified compressive strength as high as 180 MPa and high flowability. The joint shear strengths affected by the test variables were investigated in detail. The test results were also compared with two representative predictive equations for interface shear strength to determine an appropriate equation for the joint design of UHPC. These equations did not match well with the test data because they were originally proposed for normal strength concrete. However, the JSCE equation could be improved by modifying a coefficient to show good agreement with the test especially in the case of the dry joint with epoxy application.

Tryophagus putrescentiae induces inflammatory cytokine secretions from the human cell lines THP-1 and EoL-1 cells

Jeon Sang‐Jin,Kim Eun Joo,Oh Jihyun,Yun Chi‐Young 한국곤충학회 2020 Entomological Research Vol.50 No.7

The present study aimed to identify the roles of the storage mite Tyrophagus putrescentiae (Tp) in relation to human skin diseases, such as atopic dermatitis. We examined the effects of T. putrescentiae extracts (TpE) on the secretion of inflammatory cytokines and their mRNA expression in human immune cells. Human monocytic THP-1 and eosinophilic EoL-1 cells were challenged with TpE and the inflammatory cytokines, interleukin-6 (IL-6), interleukin-8 (IL-8), and monocyte chemotactic protein-1 (MCP-1) secreted in culture supernatant were analyzed using an enzyme-linked immunosorbent assay (ELISA). The mRNA levels in the cell cultures were also measured via reverse transcriptase-polymerase chain reaction (RT-PCR). In the THP-1 cells, the TpE significantly induced the secretion of IL-6, IL-8, and MCP-1 in a time- and dose-dependent manner. It also stimulated increases in the expression levels of the IL-6, IL-8, and MCP-1 mRNA. However, while the TpE induced IL-8 and MCP-1 mRNA levels in the EoL-1 cells, it did not induce IL-6 expression. Using Western blot analysis, we confirmed the activation of extracellular signal-regulated kinase (ERK), a member of the mitogen-activated protein kinases (MAPKs), in response to TpE challenge of the THP-1 cells. Collectively, our results show that TpE challenge elicits inflammatory response in the human monocytic THP-1 and eosinophilic EoL-1 cells, and it induces increased production of the inflammatory cytokines IL-6, IL-8, and MCP-1.

유아의 성별, 연령에 따른 체력 특성

전영남,양점홍,김수진,이성민 釜山大學校 附設 體育科學硏究所 2005 體育科學硏究所 論文集 Vol.21 No.2

The purpose of this study is to examine the characteristics of young children's fitness development in accordance with gheir gender and age, providing information necessary for an effective physical education instruction for young children's growth and development. For the purpose, this researcher selected total 257 young children from K Kindergarten located at K-gu in B Metropolitan City who consisted of 73 boys and 45 girls, both of were fully aged 4, and 83 boys and 56 girls, fully aged 5.......

자동차 인스트루먼트 패널에 사용되는 플라스틱의 크리프 거동

김영삼(Young Sam Kim),전치훈(Chi Hoon Jeon),Erdenebat Tumur-Ochir,염영진(Young Jin Yum) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.12

자동차 인스트루먼트 패널에 사용되는 플라스틱의 온도와 시간에 따른 기계적 거동을 알아보기 위해 시편에 대한 인장 및 크리프 시험을 수행하였다. 여러 가지 온도에서의 물성치를 구한 결과 온도에 따라 물성치가 크게 변화함을 알 수 있었다. 4 가지 하중조건하에서의 3 점굽힘 크리프시험을 수행하고 지수법칙의 시간경화식을 적용하여 각종 계수를 구하고 크리프 거동을 간단한 식으로 표현하였다. 유한요소 크리프 해석 결과 하중이 커짐에 따라 수치해석 결과와 실험 결과가 차이가 커지지만 대체적으로 두 결과가 유사한 것을 확인할 수 있었다. Tensile and creep tests were performed at various temperatures to investigate the mechanical properties of plastics used in automotive instrument panels. Mechanical properties such as Young’s modulus and Poisson’s ratios changed markedly with the test temperature. Three-point bending creep tests were performed for three kinds of plastics under four loading conditions. Coefficients in the time-hardening power law creep equation were obtained from the experiment, and the creep behavior was represented by a simple expression. The results of finite element creep analysis showed good agreement with the experimental results, while the difference between the numerical and experimental results increased with the load.

농업인 교육 프로그램 분석

김진모,김진군,마상진,전영욱,이진화,주현미 한국농업교육학회 2007 농업교육과 인적자원개발 Vol.39 No.1

이 연구는 농업인을 대상으로 한 교육 프로그램의 내용 및 방법을 살펴봄으로써 향후 농업인 교육을 위한 기초자료를 제공하는 데 목적이 있었다. 농업인 교육프로그램 분석을 위한 개념적 틀은 관련문헌에 대한 고찰과 수집 자료에 대한 귀납적 분석을 통해 개발되었다. 그 결과, 8가지의 기관 유형, 17가지의 프로그램 내용 영역, 5가지의 교육방법, 3가지의 교육인원, 3가지의 교육기간이 도출되었다. 분석대상은 총 173개 기관의 2,483개 프로그램이었다. 이 연구의 주요 결과는 다음과 같다. 첫째, 우리나라의 농업인 교육은 국가기관 및 기술센터 등의 정부기관 주도로 이루어지고 있었다. 둘째, 재배/사육기술, 생활개선 및 농촌건강관리, 정보획득 등의 내용이 주요 교육내용으로 다루어지고 있었다. 셋째, 각 기관 유형별로 비중 있게 다루는 주요 교육내용에 있어서 다소 차이가 있었다. 넷째, 농업인 교육프로그램에서 활용되는 교육방법은 대체적으로 강의에 편중되어 있었다. 다섯째, 교육인원에 있어 중규모와 대규모 인원의 비중이 상대적으로 높았으며, 1 대 1 개별 교육은 전혀 없는 것으로 나타났다. 여섯째, 1일 혹은 3일 이상 이루어지는 교육의 비중이 상대적으로 높았으며, 2일 동안 이루어지는 교육의 비중은 비교적 낮은 편이었다. The purposes of this study were to analyze the farmer education programs in Korea, and to get implications for further program development. The framework for the analysis was developed through extensive literature review and an inductive method. As a result, eight types of organizations for farmer education, seventeen content domains of programs, five instructional methods, three categories of program participant size, and three categories of program period were derived. The subjects of analysis were 2,483 programs of 173 farmer education organizations. The major findings were as follows: 1) Farmer education programs of Korea were led by government agencies such as national organizations and extension agencies. 2) The content domains of cultivating/raising techniques, improvement of life quality and farmer health care, and information acquisition were relatively highly dealt with. 3) Main contents which were dealt with by each type of farmer education organization were differentiated. 4) In terms of instructional method, a lecture had the highest portion in most contents domains. 5) The portion of the middle size and large size of participants was relatively higher than others. And there are no programs which used one by one teaching method. 6) The portion of programs for 1 day or 3days was relatively higher, and the portion of programs for 2 days was lower.

정신보건관련시설 입원(소)자의 주요 정신장애 유병률 : 전국 20개 시설의 입원(소)자를 대상으로

조성진,조맹제,서동우,함봉진,홍진표,배재남,이준영,이동우,박종익,전홍진,김성주,김용익 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.6

Objectives : One of the objectives of this study is to estimate the prevalence rates of psychiatric diagnoses in the combined populations of psychiatric hospitals, psychiatric nursing facilities and homeless asylums using the Korean version of the Composite International Diagnostic Interview (K-CIDI), which is a comprehensive and fully standardized interview schedule to assess psychiatric disorders for diagnosis. The Other objective is to compare with previously studied prevalence rates of Psy-chiatric diagnoses using the results of this study. Methods : The study subjects, aged from 181o 64 years, were randomly selected from 64,582 institutionalized population of psychiatric hospitals, Psychiatric nursing facilities and homeless asylums as of 30, June, 2001. Twelve trained interviewers administered the K-CIDI to the selected respondents. A total of 1,875 respondents (male 1,194, female 681) completed the interview. Results : The lifetime and one year prevalences of any diagnosis excluding nicotine dependence · withdrawal, anxiety disorder, eating disorder, somatoform disorder were 88.2% (male 88.1%, female 88.3%), and 65.8% (male 62.7%, female 73.7%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were 78.5% (male 75.3%, female 83.7%), and 56.8% (male 51.9%, female 64.8%), respectively. The lifetime and one year prevalences of alcohol use disorder (dependence/abuse) were 26.7% (male 37.9%, female 8.3%), and 8.7% (male 12.8%, female 2.1%), respectively. The lifetime and one year prevalences of mood disorder were 18.1% (male 13.5%, female 25.8%), and 10.4% (male 7.2%,female 16.9%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were comparable with the 2001 community survey by 1.19% to 1.32%, and 0.51% to 0.61%, respectively. The lifetime and one year prevalences of schizophrenia were also comparable by 0.16% to 0.28%, and 0.16% to 0.25%, respectively. There were no significant changes of prevalence rates when correction were applied to other psychiatric diagnosis. Conclusion : The results of this study could be used for evaluating the distribution of psychiatric diagnoses in mental health related facilities and for planning mental health policies.

젊은 연령층과 고령층에서 발생하는 뇌동맥류의 임상적 비교연구

전용선,송시헌,고현송,염진영,김성호,김윤 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.8

남성화를 보이는 여성에서 발견된 난소의 Steroid Cell Tumor 1예

조인호,정대훈,박영미,서영진,손영실,정철회,강영미,정수전,김영남,이경복,성문수,김기태 인제대학교 2006 仁濟醫學 Vol.27 No.-

Steroid cell tumor is a rare ovarian sex cord-stromal tumor which accounts for 0.1% of all ovarian tumors. Until now, only 4 cases have been reported in domestic literatures. Steroid cell tumor often secrets testosterone and presents virilization in adult women or precocious puberty in children. Treatment is often performed by surgical removal, adjuvant chemotherapy and radiation, but completely accepted treatment was not existed. We experienced a case of steroid cell tumor, which was manifested by typical virilization in a 43-year old patient, who was previously performed hysterectomy and unilateral oophorectomy. So, we present with a brief review of the literatures.

서울의 PPNG 발생 빈도(1991-1992)

김재홍,윤기범,박평원,김영진,전경민,김영태,김중환,곽호,구상완,송민석,유옥,지혜구,김동원,문상은,박영립,정승호,성범진,성순제,엄주용,황정열,이기홍,이주협,전태진 대한화학요법학회 1994 대한화학요법학회지 Vol.12 No.1

The prevalence of PPNG among pretreated gonorrhea cases isolated at the STD clinic of Choong-Ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1991, 123 strains of N.gonorrhoeae were isolated, among which 58(47.1%) were PPNG. In 1992, 98 starains of N.gonorrhoeae were isolated, among which 51(52.0%) were PPNG. In all, 109(49.3%) strains were found to be PPNG among 221 strains isolated between 1991-1992. The prevalence of PPNG in Seoul showed increased tendency till 1989, thereafter, it has been stationary or slightly decreasing.

한ㆍ미ㆍ일 물류기업의 M&A 장기성과에 관한 실증적 연구 : 재무적 성과 분석을 중심으로

전호진,박영태 韓國東北亞經濟學會 2008 동북아경제연구 Vol.20 No.2

In this paper, we investigated M&A long-term performance especially focusing on the financial performance. In this paper, we used the event study method which measures a firms value, profitability, stability and growth which calculated by financial ratio analysis. The event study window is 1, 2, 3years before the event date(O day) and 1, 2, 3years after the date. The empirical study used the t-test for 4, 56, 36 samples which was derived from KOREA, U.S., JAPAN, was made with the use of firms value, profitability, stability and growth which calculated by financial ratio analysis. We found that after M&A, tobin'Q, market value was higher than before and after M&A, profitability, growth was higher than before M&A, but current ratio and quick ratio was lower than before except debt ratio. Judging from this, we can conjecture that in case of M&A, there was a positive effect on the firm value, profitability and growth. Therefore, we infer that economics of scale, economics of scope and synergy effect coexisted in M&A between logistics firms. Actually, we conjecture that acquirer firms, using a M&A, find theirs way into new world market, network and gain first mover advantage.