• 한국산림과학회지
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• 제99권2호
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• pp.204-212
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• 2010

This study was performed in 22 unthinned Larix olgensis plantations in northeast China. Data were collected on 95 sample trees of different canopy positions and the diameter at breast height ($d_{1.3}$) ranged from 5.7 cm to 40.2 cm. The individual tree models for the prediction of vertical distribution of live crown, branch and needle biomass were built. Our study showed that the crown, branch and needle biomass distributions were most in the location of 60% crown length. These results were also parallel to previous crown studies. The cumulative relative biomass of live crown, branch and needle were fitted by the sigmoid shape curve and the fitting results were quite well. Meanwhile, we developed the crown ratio and width models. Tree height was the most important predictor for crown ratio model. A negative competition factor, ccf and bas which reflected the effect of suppression on a tree, reduced the crown ratio estimates. The height-diameter ratio was a significant predictor. The higher the height-diameter ratio, the higher crown ratio is. Diameter at breast height is the strongest predictor in crown width model. The models can be used for the planning of harvesting operations, for the selection of feasible harvesting methods, and for the estimation of nutrient removals of different harvesting practices.

• 한국화재소방학회논문지
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• 제25권5호
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• pp.47-53
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• 2011

건축물 적재가연물은 종류 및 양 등의 특성에 따라 화재지속시간과 화재규모 등에 크게 기여한다. 서점은 다른 건축용도보다 가연물이 다량 적재되어 있으므로 화재발생시 화재위험성이 클 가능성이 있다. 그러나 한편으로는 서점 내부의 서적은 연소하면 탄화층이 형성되고 적재가연물량에 비해 노출표면적이 작기 때문에 화재시 열분해가스의 생성이 작을 가능성도 있다. 이러한 가능성을 다양한 실험을 통해 파악하여 서점의 화재안전설계에 합리적으로 반영할 필요가 있다. 따라서 본 연구에서는 서점의 성능위주설계에 활용하기 위하여 적재가연물을 재현한 시험체를 가열로에 넣고 ISO834-1:1999 표준가열곡선에 따라 가열하는 일련의 실험을 실행하였다. 이 실험 결과를 바탕으로 서점의 적재가연물의 연소발열성상을 파악하고 성능위주설계에 필요한 연소속도 및 열방출률 등을 제시하였다.

• Geomechanics and Engineering
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• 제5권3호
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• pp.195-221
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• 2013

A centrifuge model study is carried out to investigate the behavior of pile subject to negative skin friction induced by pile installation, ground water drawdown and surcharge loading. A single end-bearing pile is examined as the induced negative skin friction would induce the most severe stress on the pile structural material as compared to friction piles. In addition, the behavior of the pile under simultaneous negative skin friction and dead/live loads is examined. To facilitate detailed interpretations of the test results, the model setup is extensively instrumented and involves elaborate test control schemes. To further examine the phenomenon of negative skin friction on an end-bearing pile, finite element analyses were conducted. The numerical analysis is first validated against the centrifuge test data and subsequently extended to examine the effects of pile slenderness ratio, surcharge intensity and pile-soil stiffness ratio on the degree of mobilization of negative skin friction induced on the pile. Finally experimental and numerical studies are conducted to examine the effect of applied transient live load on pile subject to negative skin friction.

• 융합보안논문지
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• 제7권2호
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• pp.91-100
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• 2007

포렌식 수사에 있어서 많은 포렌식 도구들이 수사에 사용되고 있지만 기존의 포렌식 도구는 일반 수사관이 사용하기에 불편하다는 단점이 있다. 정보 유출과 관련하여 긴급히 증거를 수집해야 할 상황에서 데이터를 수집해 증거로 활용할 수 있게 만들 때까지는 시간이 걸린다. 따라서 일반 수사관이 간단한 클릭만으로도 증거를 수집하고 또한 심층 수사로 갈 것인지를 판별할 수 있는 사전 조사격의 포렌식 도구가 필요하다. 따라서 본 고에서는 활성 시스템에서 수집할 수 있는 증거에 대해 알아보고 사전 조사에 사용할 수 있고 일반 수사관이 다루기 쉬운 포렌식툴을 설계 및 구현하고자 한다.

• Molecules and Cells
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• 제38권11호
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• pp.975-981
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• 2015

Precise 3D spatial mapping of cells and their connections within living tissues is required to fully understand developmental processes and neural activities. Zebrafish embryos are relatively small and optically transparent, making them the vertebrate model of choice for live in vivo imaging. However, embryonic brains cannot be imaged in their entirety by confocal or two-photon microscopy due to limitations in optical range and scanning speed. Here, we use light-sheet fluorescence microscopy to overcome these limitations and image the entire head of live transgenic zebrafish embryos. We simultaneously imaged cranial neurons and blood vessels during embryogenesis, generating comprehensive 3D maps that provide insight into the coordinated morphogenesis of the nervous system and vasculature during early development. In addition, blood cells circulating through the entire head, vagal and cardiac vasculature were also visualized at high resolution in a 3D movie. These data provide the foundation for the construction of a complete 4D atlas of zebrafish embryogenesis and neural activity.

• 한국수산과학회지
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• 제36권6호
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• pp.735-742
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• 2003

In order to develop a logical method for using selective fishing gear, the behaviour and habits of the aquatic animals must be investigated. However, until now, little national research has been carried out to investigate the behaviour and habits of the common octopus (Octopus minor). The purpose of this study henceforth, is to compile necessary behavioral data to develop fishing gear to catch the common octopus. Behaviour and habits of the common octopus were observed while breeding in a water tank from February to May, 2003. The feeding habits of common octopus are more vigorous at night than in the daytime. The common octopus feeds on 1-4 bait crabs per day and consume each crab in 40-50 min. The sensory organs of the common octopus are more influenced by the sense of touch and smell, than by vision. Using live bait is more effective and advantageous than using dead bait, as the common octopus responded more to live bait. The hiding habits of the common octopus were very intensive, as they hid around all the shelters that were provided in this study. They demonstrated territorial behavior and struggled to maintain their sphere of influence. In addition, out of the various colors for shelters and bait supplied, the common octopus preferred light colors.

• 대한간호학회지
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• 제37권5호
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• pp.724-735
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• 2007

Purpose: The purpose of this study was to explore and describe the experiences of the family caregivers using a nursing home for their elderly family members. Method: Participants for this study were 1 man and 9 women caregivers. Data was collected through in-depth interviews from October, 2005 to April, 2006 and analyzed using Strauss and Corbin's grounded theory methodology. Results: "Finding a way to live together" emerged as a core category and it reflected expanding consciousness allowing them to see each other in a more positive view. The basic social process of "finding a way to live together" includes 3 phases: 1) recognizing the problems, 2) finding solutions to the problems, and 3) accepting the changes in their surrounding. Lack of privacy, family troubles, extreme distress, and unavailable caregivers are reflected in the process of recognizing the problems. The process of finding solutions was making a decision, obtaining family agreement, choosing the best nursing home, and enduring the financial burden. Possible outcomes of the last phase include recovering peace of mind and continuing conflict. Conclusion: Findings from this study offer suggestions for developing a strategy to help not only the elderly but also the family caregivers.

• Human Ecology Research
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• 제54권3호
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• pp.307-319
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• 2016

This study examined the influences of both peer and parent-child relationships on suicidal ideation in adolescents with a focus on interpersonal relationships in adolescence that can act as risks as well as protective factors for youth suicide. This study analyzed 5,440 middle and high school students drawn from data, the seventh Happy Planet Index of children-adolescent in Korea, and conducted a series of logistic regressions. The results are as follows. First, both direct and indirect involvement in the school violence affects suicidal ideation as a risk factor in peer relationships. However, the quality and quantity of close friends of adolescents do not represent a protective role against suicidal ideation insofar as they are exposed to school violence. Second, adolescents who live apart from one of their parents are vulnerable to suicidal ideation than those who live with two parents. Third, very poor parent-child relationships in adolescence are not necessarily associated with suicidal ideation in adolescents. Fourth, shared time or activities between parents and adolescents in terms of family meal times are more likely to reduce suicidal ideation in adolescents than the emotional characteristics (trustworthiness or a close relationship) of parents and adolescents. The findings provide implications that frequent contact and shared activities in terms of family dining may contribute to the prevention of adolescent suicide.

• 한국간호교육학회지
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• 제17권2호
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• pp.306-316
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• 2011

Purpose: The purpose of this study was to compare health promotion lifestyles of college nursing students between students who live with their parents and students who are self-boarders. Methods: The sample consisted of 375 college nursing students in C and S city. Self report questionnaires were used to measure the variables. In data analysis, the SPSSWIN 18.0 program was utilized for descriptive statistics, Pearson's correlation coefficients, and multiple regression analysis. Results: The mean score for Health Promotion Lifestyle in living with the parents group was significantly higher than that of the self-boarders group (t=-2.16, p=.031). In multiple regression, perceived health state, exercise frequency, self-rated knowledge about health, and grade were significant predictors of Health Promotion Lifestyle in college nursing students, explaining 26.3%. Conclusion: This study suggests that perceived health state, exercise frequency, and self-rated knowledge about health, and grade are significant influencing factors in Health Promotion Lifestyle in college nursing students. Therefore, strategies which improve these variables must be developed for college nursing students.

• 한국주거학회논문집
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• 제25권4호
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• pp.47-57
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• 2014

The purpose of the study was to find out the preference of small house as the social relations of university students. The data for the analysis were collected through questionnaire survey method from September 24 to October 12, 2012, and the sample consisted of 283 students of the university in Seoul. The social relationship has been surveyed using modified life-style indicators. The community spaces and equipment in the small house has been divided into 21 community spaces and 3 equipments. The characteristics of small house preference were consisted of the residential comments, residence time, resident partner, house size, considered factors of the residence and small house ownership. The finding of this study were as following: 1) The social relationship of respondents were typed as the type of relationship oriented (oriented family, oriented friends and neighbors) and type of non-relationship oriented. The social relationship of respondents were the type of relationship oriented. 2) The respondents are willing to live in small houses, to live with 1-2 people and after work. When living in small house, they consider public transport accessibility and ease of use amenities. But neighbor relationship is not considered. 3) They are preferred security office, administrative office, home storage, parks and green space.