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청년기와 중년기 집단에서의 삶의 의미와 심리적 안녕감간의 관계
허지연(Jiyeon Heo),손은정(Eunjung Son) 계명대학교 사회과학연구소 2009 한국사회과학연구 Vol.28 No.2
The study examined the comparisons of meaning in life, self-efficacy(general self-efficacy and social self-efficacy), perceived social support(support of emotion, information, substance, and estimation), psychological well-being mean-levels between cohorts of young and middle-aged adults, and the mediated role of self-efficacy and perceived social support in the relationship between meaning in life and psychological well-being in cohorts of young and middle-aged adults. The participants were 179 young adults(average age 22.8 years, 97 men, 82 women) and 206 middle-aged adults(average age 43.5 years, 114 men, 92 women) in Seoul, Ulsan, and Jochiwon city. The instrument used for this study were Meaning in Life Questionaire(Steger, Frazier, Oishi, & Kaler, 2004), Self-Efficacy Scale(Sherer, Maddux, Mercandante, Prentice-Dunn, Jacobs, & Rogers, 1982), Social support scales(Park, 1985), Psychological Well-Being Scale(Ryff, 1995). This results of this study were summarized as follows. First, Mean-level analyses, young adults reported significantly higher social self-efficacy, support of emotion, information, substance, and estimation compared to middle-aged adults. Second, meaning in life had a significant effect on psychological well-being in cohorts of young and middle-aged adults. Third, general self-efficacy, social self-efficacy and support of estimation mediated the effect of meaning in life on psychological well-being in cohorts of young and middle-aged adults.
Heo, Yongju,Park, Jiyeon,Lim, Sung-il,Hur, Hor-gil,Kim, Daesung,Park, Kihong Royal Society of Chemistry 2010 Journal of environmental monitoring Vol.12 No.8
<P>Size-resolved bacterial concentrations in atmospheric aerosols sampled by using a six stage viable impactor at rice field, sanitary landfill, and waste incinerator sites were determined. Culture-based and Polymerase Chain Reaction (PCR) methods were used to identify the airborne bacteria. The culturable bacteria concentration in total suspended particles (TSP) was found to be the highest (848 Colony Forming Unit (CFU)/m<SUP>3</SUP>) at the sanitary landfill sampling site, while the rice field sampling site has the lowest (125 CFU/m<SUP>3</SUP>). The closed landfill would be the main source of the observed bacteria concentration at the sanitary landfill. The rice field sampling site was fully covered by rice grain with wetted conditions before harvest and had no significant contribution to the airborne bacteria concentration. This might occur because the dry conditions favor suspension of soil particles and this area had limited personnel and vehicle flow. The respirable fraction calculated by particles less than 3.3 μm was highest (26%) at the sanitary landfill sampling site followed by waste incinerator (19%) and rice field (10%), which showed a lower level of respiratory fraction compared to previous literature values. We identified 58 species in 23 genera of culturable bacteria, and the <I>Microbacterium</I>, <I>Staphylococcus</I>, and <I>Micrococcus</I> were the most abundant genera at the sanitary landfill, waste incinerator, and rice field sites, respectively. An antibiotic resistant test for the above bacteria (<I>Micrococcus sp</I>., <I>Microbacterium sp</I>., and <I>Staphylococcus sp</I>.) showed that the <I>Staphylococcus sp</I>. had the strongest resistance to both antibiotics (25.0% resistance for 32 μg ml<SUP>−1</SUP> of Chloramphenicol and 62.5% resistance for 4 μg ml<SUP>−1</SUP> of Gentamicin).</P> <P>Graphic Abstract</P><P>This study provides dominant types of airborne bacteria existing in different outdoor environments, leading to better understanding of their source and effects on human health. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0em00004c'> </P>
Heo, Seongmoo,Lee, Jiyeon,Jeon, Hyoungwoon,Kim, Myoungjun,Chung, Young-Shin The Korean Society of Food Hygiene and Safety 2021 한국식품위생안전성학회지 Vol.36 No.2
본 연구는 고삼 물추출물과 주 성분인 마트린의 유전독성 유발능을 마우스 간세포 및 혈구세포에서 체내 단세포전기영동 시험법을 사용하여 평가하였다. OECD TG 489에서 정하고 있는 체내 알카리코멧 시험법(in vivo alkanine Comet assay)을 수컷 마우스를 사용하여 수행하였다. 고삼물추출물의 투여 용량은 한계 용량을 포함하도록 체중 대비 1,000와 2,000 mg/kg으로 하였다. 마트린의 세 투여용량은 50, 100, 200 mg/kg으로 정하였고, 최고 투여용량은 용량 설정시험을 통하여 설정하였다. 음성대조물질과 시험물질은 경구로 3회 투여하였고, 양성대조물질(ethyl methanesulfonate, EMS)은 2회 투여하였다. 마지막 투여 후 3-4시간 내에 간조직과 혈액을 채취하였고 단세포전기영동을 알카리 조건에서 수행하였다. 코멧 시험 결과, 고삼 물추출물과 마트린에 의한 체중의 변화가 관찰되지 않았으며, 간세포와 혈구세포에서 통계적으로 유의성 있는 유전자 손상을 유발하지 않았다. 따라서, 본 연구조건에서 고삼 물추출물과 마트린은 유전독성 유발능이 없는 것으로 사료된다. The genotoxic potentials of the water extract of Sophorae Radix (WSR) and matrine as a major compound were investigated in murine hepatocytes and blood cells using single-cell gel electrophoresis. According to the test guidelines of OECD TG 489, an in vivo alkaline Comet assay was performed using male mice. The treatment doses of the WSR were 1,000 and 2,000 mg/kg body weight to include the limiting dose. The three test doses for matrine were 50, 100, and 200 mg/kg, and the maximum dose was estimated from a dose range-finding test. The negative control and test articles were administered three times by oral gavage, and the positive control (ethyl methanesulfonate, EMS) was administered twice. Within 3-4 h after the last treatment, the liver tissue and blood were collected, and single-cell electrophoresis was performed under alkaline conditions. The in vivo Comet assay showed no changes in body weights during the treatments with the test articles. The WSR and matrine did not induce significant DNA damage in the liver and blood cells of mice compared to the vehicle treatment. In conclusion, matrine and the WSR may not have genotoxic potential.
Jiyeon Nam,Jinwook Heo,Jeong Woo Kim,Hyungbo Shim,Jae Sung Bang,Jinsung Kim 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
In this paper, we address the problem of dynamic average consensus in a discrete-time setting. The objective of dynamic average consensus problem is for each state of agent to track the average of reference input signals of each agent in a distributed manner. Without initialization process, the proposed algorithm renders the state of each agent converge practically to the average of time-varying reference signals with any given bound. It is a simple time-domain algorithm based on two-time scale. Finally, by applying our algorithm to an distributed optimization problem, we provide two simulation results that converge correctly when the initial conditions are perturbed and that converge within certain amount of small error when numerical errors are injected every time step.
3세대 이동통신에서 DCH 고갈형 DoS 공격 탐지 기법
박지연(Jiyeon Park),강동화(Donghwa Kang),조유근(Yookun Cho),허준영(Junyoung Heo) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1A
피쳐폰(Feature Phone)이 주를 이루던 초기 3G(Third Generation)는 사용자의 데이터 사용량이 많지 않았다. 그러나 스마트폰이 등장하면서 데이터를 이용한 서비스의 다양화, 저렴한 데이터 요금 정책으로 데이터 사용량이 대폭 증가하였다. 이동통신사가 예상하지 못한 데이터 사용량 증가로 3세대 망의 새로운 보안상 취약점이 나타났고 이를 이용한 DoS(Denial of Service) 공격이 발생하고 있다. 본 논문에서는 3세대 망에서 나타날 수 있는 DoS 공격의 하나인 DCH(Dedicated Channel) 고갈형 Dos 공격에 대해 논의하고 정상 사용자의 패킷 사용 패턴을 이용한 탐지 기법을 제안한다.
스마트폰 사용 보행자를 위한 계단에서의 사고 방지 시스템 제안
이동운(Dongwoon Lee),이지연(Jiyeon Lee),허선행(Sunhang Heo),장준영(Junyoung Jang),조준동(Jundong Cho) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
인간은 여러 가지 감각을 통해 위험을 인지하고 그 위험에 대해 대처를 한다. 하지만 최근 들어 보행 중에 스마트폰을 사용하는 사람이 급증하고 있고 보행자는 스마트폰을 사용하는 동안 시각과 청각을 통해 위험을 감지하는 능력이 크게 감소함으로써 사고가 날 확률을 크게 만들었다. 본 연구는 스마트폰을 사용하며 계단을 이용하는 보행자에게 촉각, 시각적 자극을 줌으로써 시선을 계단으로 옮기게 하여 사고확률 감소에 영향을 미치는지를 알아보기 위한 계단 디자인을 제안하고자 한다.