• Journal of Labour Economics
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• v.27 no.1
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• pp.77-105
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• 2004

Given the limitations of UI benefit and self-insurance through precautionary savings, this paper suggests a new scheme of income support for the unemployed, which offers unemployed workers not only UI benefit but also borrowings from their future pension incomes. Allowing individuals to have effective self-insurance through pension- borrowing, this scheme provides them with consumption-smoothing and reduction in risk burden while maintaining search incentives of the unemployed. Simulation study based upon household panel data in Korea suggests that a heavy reliance should be set upon self-insurance through pension-borrowings rather than upon UI benefit, even for the low-income individuals who are subsidized under UI system. This result provides us with insightful implications for a social safety net in (fast-growing) developing countries, where people cannot afford a good amount of UI benefit or of precautionary savings against unemployment although they expect their incomes to be much higher in the future. Indeed, it is consumption-smoothing effect of self-insurance through pension- borrowings, as well as its incentive-maintaining effect, that makes it a promising alternative of social safety net in developing countries.

• Korean journal of applied entomology
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• v.39 no.3
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• pp.141-147
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• 2000

This study was carried out to investigate the population changes of Liriomyza trijolii (Burgess) on chrysanthemum and its relationship to plant growth and damages. In spring culture of chrysanthemum, L. trifolii adults begun to be attracted by the yellow sticky trap from early May and maintained high population until the middle of July. Larval density increased gradually from late May and reached peak in early July. In autumn culture, the population density of adult was lower than that of spring culture but the number of adult was great in late September and the middle of October. This trend was similar to that of larval stage. Damaged leaves by larva could be found from 4 weeks after transplanting and its rate was low until 5 weeks but increased abruptly after 6 weeks and maintained 70% level until flowering stage in spring culture. Damaged leaves increased with plant growth in some varieties tested in this experiment.

• Korean journal of applied entomology
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• v.57 no.1
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• pp.51-52
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• 2018

Out of 60 quarantine insect pests in Korea, 42 species are classified into tephritid fruit flies. Most of these fruit flies are attracted to two natural products, methyl eugenol (ME) or raspberry ketone. Paraffin wax has been devised to formulate these lures. The formulated lures were applied to field test in Taiwan to attract quarantine fruit flies. Wax-ME formulation was installed in Delta trap and could attract 60-80 males of B. dorsalis per day during late August, while a wax formulation of Cue-lure (a methylated compound of raspberry ketone) attracted both B. cucurbitae and B. tau. These wax formulations can be applied to monitor these three quarantine species in Korea.

• Korean journal of applied entomology
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• v.54 no.4
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• pp.311-316
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• 2015

This study was performed to ascertain the potential of egg plant for use as a trap plant to attract Bemisia tabaci adults compared to that of tomato. Choice tests were conducted to compare the preference of B. tabaci adults to horseweed, egg-plant, cucumber, and tomato. B. tabaci adults were found to be more sensitive to visual cues than to odor cues, and they preferred the egg-plant and cucumber to horseweed. The attraction rates of the egg-plant and cucumber to B. tabaci adults were 82.3% and 82.5% respectively, compared to that of tomato. Because egg-plants are easier to manage compared to cucumber, we excluded cucumber from subsequent experiment. The attraction rate of egg-plant to B. tabaci adults was >90% when the height of egg-plant was equal or more than that of the tomato plant.

• Journal of Life Science
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• v.13 no.2
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• pp.175-183
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• 2003

The chimpanzee and gorilla are classified into hominidae, catarrhini, primates. These species are originated from Africa, so called African great apes. Recently, primatologists have classified that there are 2 species 5 subspecies of the chimpanzee and gorilla, respectively. Since the human genome project has been finished, the chimpanzee genome project has been launched to understand human evolution and genetic diseases. The sequences of chimpanzee chromosome 22 homologous to human chromosome 21 were completed, and then the Y chromosome of chimpanzee is being analyzed. Comparative analysis of human, chimpanzee and gorilla could provide the key for understanding of various human diseases and human origin. By detecting human specific-functional genes or mobile genetic elements (HERV, LINE, SINE) through primate research, we could understand what is human being\ulcorner gradually, For these comparative researches, we summarized fundamental knowledge of the feature, phylogeny and evolution of African great apes including humans.

• Journal of the Korea Society of Computer and Information
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• v.27 no.10
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• pp.67-80
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• 2022

In this study, I analyzed the inducing and hindering factors of online shopping malls on browsers in the process of browsing fashion products in online shopping malls. In-depth interviews were conducted by presenting browsing-related questions to women in their 20s and 50s who are interested in browsing fashion products online. Based on the answers of the interviewees, using grounded theory, we analyzed and presented six factors such as price factor, promotion factor, purchase review factor, visual information factor, product information factor, and service factor. Based on inducing and hindering factors to browsing analyzed in this study, a strategy to design a browsing environment in terms of shopping malls was suggested, which will be helpful for practical strategies and marketing in related industries. Basic data will be presented in a thesis on a new type of shopping mall browsing environment related to the rapidly developing information and communication technology. In addition, the negative emotions experienced in relation to the detrimental factors of shopping malls in the browsing process are expected to be helpful in researching fashion product browsing related to consumer psychology.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2023.04a
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• pp.29-29
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• 2023

특정도서(特定島嶼)의 다양한 자연생태계, 지형 또는 지질 등을 비롯한 자연환경의 보전에 관한 기본적인 사항을 정함으로써 현재와 미래의 국민 모두가 깨끗한 자연환경 속에서 건강하고 쾌적한 생활을 할 수 있도록 함을 목적으로 하는 '독도 등 도서지역의 생태계보전에 관한 특별법(도서생태계법)' 제6조 및 특정도서 보전기본계획(2015~2024)에 의거하여 한강유역환경청에서는 33개(강화군 8, 옹진군 23, 안산시 1, 화성시 1) 도서를 특정도서로 지정하여 관리하고 있다. 본 연구에서는 출입과 개발행위가 제한되어 있는 특정도서의 식물상 조사를 도서생태계법 제6조에 의거하여 수행하였고, 인근 유인도서와 식물상을 비교 기록하였다. 조사된 유인도서는 덕적도, 영흥도, 선재도, 측도, 문갑도, 소야도의 6개 도서이고, 무인도서는 특정도서로 지정된 33개 도서 전체를 대상으로 하였다. 무인도서에서는 90과 225속, 294종, 3아종, 22변종, 1품종, 총 320분류군이 기록되었다. 이 중 국 가적색목록은 지치(Lithospermum erythrorhizon), 이팝나무(Chionanthus retusus), 모새달(Phacelurus latifolius) 3분류군과 한반도 고유종은 새끼노루귀(Hepatica insularis) 등 3분류군이 확인되었으며, 메귀리(Avena fatua) 등 외래식물 24분류군과 돼지풀(Ambrosia artemisiifolia) 등 생태계교란식물 3분류군이 확인되었다. 대조군인 유인도서에서는 116과 350속, 532종, 7아종, 37변종, 3품종, 총 579분류군이 기록되었다. 이 중 선재도에서 멸종위기야생생물 II급 매화마름(Ranunculus trichophyllus var. kadzusensis)이 확인되었으며, 국가적색목록은 낙지다리(Penthorum chinense) 등 4분류군, 한반도 고유종은 할미밀 망(Clematis trichotoma) 등 7분류군이 확인되었으며, 미국자리공(Phytolacca americana) 등 53분류군의 외래식물과 가시박(Sicyos angulatus) 등 6분류군의 생태계교란식물이 확인되었다.

• The Journal of Information Systems
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• v.23 no.1
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• pp.1-28
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• 2014

소셜 네트워크 서비스의 확산과 더불어 소셜 네트워크 게임(이하에서는 소셜게임이라 함)이 부각되고 있다. 한편, 소셜게임이 인기를 끌면서 소셜 네트워크 서비스가 더욱 확산되는 계기가 되기도 한다. 사용자들을 소셜게임에 몰입하도록 유인하는 요인이 무엇인가를 파악하면 소셜 네트워크 서비스가 더욱 발전할 수 있는 방안을 찾을 수 있다. 따라서 본 연구는 사용자들을 소셜게임에 몰입하도록 유인하는 요인이 무엇인가를 분석하는데 있다. 본 연구에서는 대표적인 소셜 네트워크 사이트라 할 수 있는 페이스북의 소셜게임 사용자들을 대상으로 설문조사를 실시하였다. 280명의 사용자들을 대상으로 한 설문을 통해, 소셜게임에의 몰입, 게임스토리, 게임그래픽, 게임사회화, 게임 통제력, 게임 사용용이성의 관계를 구조방정식모형으로 분석하였다. 특히, 게임 사회화와 게임그래픽은 몰입에 직접적으로 영향을 주기도 하며 게임 사용용이성을 통해 간접적으로도 영향을 주었다. 한편, 게임스토리는 몰입에 직접적으로만 영향을 주고, 게임 통제력을 게임사용 용이성을 통해 간접적으로 영향을 준다. 본 연구는 몰입이론과 기술수용이론을 토대로 하고 있지만, 소셜게임에서의 몰입에 대한 최초의 연구이기 때문에 후속 연구에 지침이 될 수 있다. 또한 소셜게임을 개발하는 사업자들이 무엇에 역점을 두고 게임을 개발하고 서비스해야 할 것인가에 대한 지침이 될 수 있다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.41-43
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• 2022

항행선박에 위치정보를 제공하기 위하여 관내 유인등대 및 주요 항로상에 레이더 비콘 14기를 설치·운영 중이나, 대부분의 선박에서 전자해도와 AIS를 이용하고 다른 표지와 기능이 중복되어 레이더 비콘 운영에 대한 개선방안을 마련하였다..

• Korean journal of applied entomology
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• v.59 no.4
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• pp.295-301
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• 2020

In this study, we aimed to investigate the changes in the catch rate of Monochamus saltuarius, based on sexual maturation by using aggregation-sex pheromone traps. Ovariole development of caught M. saltuarius females was compared to that of the ones not caught using traps. In a mesh cage set up at the Hongneung experimental forest, we placed a multi-funnel trap with or without an aggregation-sex pheromone lure. M. saltuarius adults, which emerged from pine logs, were grouped in four according to the emergence dates (0, 1, 7, and 10 days after emergence [DAE]). We released beetles into the mesh cage to investigate the catch rate using the traps. In each group, a total of 80 beetles (20 beetles × 4 replications) were tested, making it a total of 320 beetles. Among the four groups, M. saltuarius adults in the 7 DAE group were caught more frequently using the traps, especially with a pheromone lure; the other groups showed a low catch rate. A similar number of female and male beetles were caught using the traps. Regarding ovariole development, all the female adults in the 0 and 1 DAE groups were immature, while those in the other two groups were completely developed. Therefore, aggregation-sex pheromone traps might have a limitation in the prevention of pine wilt disease because of the transmission of pine wood nematode during maturation feeding of newly emerged M. saltuarius adults. However, aggregation-sex pheromone traps can be effective for collecting sexually mature M. saltuarius adults, for the investigation of seasonal occurrence of beetles in forests.