Comparison of the effect of temperature on survivorship and fecundity of two planthoppers, Laodelphax striatellus and Sogatella furcifera

Jeong Joon Ahn,Changu-Gyu Park,Hong-Hyun Park,Kwang-Ho Kim,Sang-Gye Lee,Hyun-Gwan Ko 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10

The small brown planthopper, Laodelphax striatellus, and the white backed planthopper, Sogatella furcifera, are important agricultural pests. L. striatellus could overwinter in Korean peninsula as nymph stage but S. furcifera could not. We investigated the survivorship and fecundity of two species for comparing population growth. The longevity and fecundity of two species were investigated at temperatures of 12.5, 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 32.5, and 35.0℃. Adult longevity and fecundity of two species were significantly influenced by temperature. Longevities of L. striatellus were longer than those of S. furcifera at different temperatures. Specially, oviposition period of L. striatellus was twice as long as that of S. furcifera. Total fecundity per female of L. striatellus were also more than those of S. furcifera. The oviposition model of each species was consisted of three components - age specific survival rate, age specific oviposition rate and total fecundity per female. The relationship between adult developmental rate and temperatures was described by exponential function. The age specific survival rate and the age specific cumulative oviposition rate were explained by two parameter inversed-Weibull function and Weibull function. Temperature dependent fecundity was estimated using three parameter Gaussian function. Daily egg production of two species in relation to adult age and temperature was estimated.

비젼 시스템을 이용한 LCD용 편광 필름의 결함 검사에 관한 연구

박종성,정규원,강찬구 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-

Recently, LCD(Liquid Crystal Display) is the display product widely used on various fields of industry. This is generally composed of many parts. Among many parts, polarizer film control the intensity of the transmitted light according to the degree of rotation of the polarizer axis. Therefore, this film must be free from defects. But it contains many defects such as the defects caused by dust or different thing, adhesive badness, scratch. Presently, the inspection of these defects is depending on the sight of operator. In this paper, we propose the vision system composed of telecentric lens and optical mirror. This system use the coaxial illumination and the light is specularly reflected on the optical mirror. And we develop the image processing algorithm using the threshold and morphological technique.

고강도 베이나이트강 크랭크샤프트 개발

김성환(Sunghwan Kim),이창구(Changu Lee),김학수(Haksoo Kim),박성환(Sunghwan Park),고영상(Youngsang Ko) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

The developments of high strength materials for automotive engine moving system have become a critical issue due to the trend of high horse power and down-size engines. A crankshaft, in particular, is of importance because it rotates with experiencing more load as engine power and fuel efficiency are increased. Therefore, stiffness and durability of crankshaft are great concern for entire engine performance as well as life-time. In this study, high strength bainite steel has been developed, and its durability has been increased by 10% compared to conventional high strength steels but maintaining cost and produce ability are similar to those. Also, hardening mechanism and fatigue properties were investigated.

위성영상을 위한 NIIRS(Natinal Image Interpretability Rating Scales) 자동 측정 알고리즘

김재희(Jeahee Kim),이찬구(Changu Lee),박종원(Jong Won Park) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.4

Risk assessment of pharmaceuticals in Korea

김영희(Younghee Kim),Kyungho Choi,Jeongim Park,Changu Park,Minyoung Kim,PanGyi Kim 한국보건교육건강증진학회 2006 한국보건교육·건강증진학회 학술대회 발표논문집 Vol.- No.-

Because pharmaceuticals are developed for specific biological effects, there are concerns about the potential for their impacts to non-target species when they are discharged into environment. The hazard of twenty six pharmaceuticals abundantly used in Korea were preliminary assessed employing a marine bacterium (Vibrio fischeri), a freshwater invertebrate (Daphnia magna) and the Japanese medaka (Oryzias latipes). The ecological hazards of these compounds were compared with environmental occurrence data obtained from our investigation and literature. Daphnia was the most susceptible among the test organisms employed in this study. The hazard quotients (HQ) derived from dividing environmental concentration with predicted no effect concentrations (PNECs) were mostly lower than unity. However a few chemicals including chlortetracycline showed high potential risk, suggesting a need of more detailed ecological risk assessment.

일부 농촌 지역 노인의 사회적 지지와 건강수준 및 건강행태와의 관련성

전보영(Boyoung Jeon),이혜재(Hyejae Lee),손창우(Changu Shon),김남권(Namkwon Kim),김애련(Aeryun Kim),박지은(Jieun Park),이은상(Eunsang Lee),이정화(Jeongwha Lee),최주현(Juhyun Choi) 한국농촌의학 지역보건학회 2009 농촌의학·지역보건 Vol.34 No.1

‘사회적 지지’는 자신이 사랑 받고 돌보아진다고 믿게 하는 정보로서 인지적ㆍ심리적 안정을 도우며 개인의 대응역량을 높여준다. 노인에 대한 사회적 지지는 심혈관 질환 등으로 인한 사망률에 영향을 주고, 우울증을 감소시키고, 스트레스와 우울 사이에 완충 역할을 하며, 건강행태 또한 사회적 맥락 속에서 결정된다고 알려져 있다. 우리나라는 노령인구의 농촌 편중 하에서, 농촌 노인들은 사회적 지지 측면에서도 도시 노인들보다 취약한 것으로 나타났다. 이에 본 연구의 목적은 일부 농촌지역 노인들을 대상으로 사회적 지지와 건강수준 및 건강행태와의 관련성을 알아 보기 위함이다. 연구대상은 강원도 춘천시 동산면 군자리에 거주하는 60세 이상 노인들 중 설문에 응한 총 79명이며, 2008년 6월 23일부터 29일까지 구조화된 설문지를 이용하여 직접면접조사를 하였다. 독립변수는 ‘가족 수, 가족과의 관계, 친한 친구 수, 참여모임 여부 및 사회적 지지 점수(MOS-SSS 수정)’로 하였고, 이에 따른 신체적 건강 즉, 주관적 건강과 만성질환 유무 그리고 정신적 건강으로 우울증을, 건강행태로 흡연, 음주, 규칙적인 운동, 숙면, 아침식사 여부와의 관계를 분석하였다. 대상 인구의 평균 연령은 72.0±7.0세 이고, 사회적 지지 점수는 20점 만점에서 평균 14.3±4.7점이었다. 정신적 건강의 SGDS 점수 측정결과 전체인구의 36.3%가 우울성향을 보였다. 건강수준에 영향을 준 요인으로서, 사회적 지지 점수가 다를때 우울 성향(p<0.001)과 운동여부(0.031)에서 유의한 차이가 있었다. 가족관계가 보통인 군에서 좋은 군보다 주관적으로 느끼는 건강수준이 낮고(OR=0.25, 95% CI=0.07-0.95), 숙면을 취하는 정도가 더 낮았다(OR=0.21, 95% CI=0.06-0.73). 친한 친구가 없는 군은 친한 친구 수가 5명 이상인 군에 비해 규칙적인 운동을 하는 경우가 더 낮았고(OR=0.21, 95% CI=0.05-0.94), 참여모임이 없는 사람은 참여모임이 있는 사람보다 ‘우울’로 나타남이 유의하게 높았다(OR=4.79, 95% CI=1.62-14.15). 이 연구를 통해 사회적 지지 점수 및 가족관계, 친구 수, 참여모임 수 등으로 대변되는 사회적 지지가 농촌 노인의 건강수준 및 건강행태와 관련이 있음을 알 수 있었다. 따라서 농촌 노인들의 건강증진을 위해서 사회적 지지를 고취시킬 수 있는 노력이 필요하겠다. Objective: The objective of this study was to evaluate the association of social support with health status and health behavior. Methods: This study was conducted with 79 elderly people in Gunja-ri, Dongsan-myun, Chuncheon. We performed face to face interview which was composed of socio-demographic characteristics, social support, health status and health behavior. The association between social support and result variables was analysed by Chi-square test and logistic regression. We used SAS ver9.1 for statistic analysis. Results: Mean age of the study population was 72.0±7.0, social support score was 14.3±4.7 with full marks of 20 and 36.25% of the total population were shown to have depression. When the social support score was changed, depression (p=0.0007) and physical exercise (p=0.0312) showed significant difference. The self-rated health status was significantly related to the relationship with family members (OR=0.25, 95% CI=0.07-0.95) and the quality of sleep was also significantly associated to the relationship with family members (OR=0.21, 95% CI=0.06-0.73). The physical exercise was done significantly less in the group ‘without’ close friends than in the group with ‘many’ close friends (OR=0.21, 95% CI=0.05-0.94) and the depression was significantly more in the group without community participation than in the group with community participation (OR=4.79, 95% CI=1.62-14.15). Conclusions: Through this study, we could conclude that the social support factors are associated with health status and health behavior. Therefore, to improve the health status of rural elderly, we need to approach to develop social support.