• 한국작물학회:학술대회논문집
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• 한국작물학회 1999년도 추계 학술대회지
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• pp.80-101
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• 1999

Self-sufficiency ratio of food crops in Korea is estimated under $20{\%}$ in 2010 because total food consumption including feed will be increased. but food grain production will be decreased. It is necessary to maintain the optimum level of food self-sufficiency rate to secure national food demand/supply balance and non-trade and multiple function of agriculture in Korea. It will be possible to produce more food grains having the acceptable quality if the appropriate policy and cropping techniques are developed and practised in future. Breeding for high yielding varieties should be the first target to raise the production potential of food crops . Number of varieties developed during last 30 years is counted as 353 in food crops. New varieties developed in 1990s showed the higher yield potential and the improved agronomic characteristics compared with 1970s and 1980s varieties. But number of varieties planted on the farmer's field over $5{\%}$ of national planting area is less than one third of total varieties developed Breeding efforts to maintain planting area of main food crops should be focussed on consumer's demand and farmer's need. They are the best quality variety in each field of crop utilization, the newly designed variety adapting to changes of natural, rural and cropping environment, and the higher yielding variety. It is also needed to develop new quality crop varieties for inducing more consumption of crop grain produced in Korea for direct food or processing. Development of barley varieties for animal feed. high income soybean varieties, high quality wheat variety. and super yielding rice and barley varieties are also needed to keep or maximize national food production potential. In order to establish the appropriate cropping technique for domestic food security, the strong and continuous interest and financial support on crop breeding are required, and the inter-disciplinary and inter-institutionary researches should be strengthened for successful crop breeding.

• 지구물리와물리탐사
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• 제21권4호
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• pp.231-243
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• 2018

흐름 전위는 지하 공극 내 유체의 흐름에 의해 발생하는 자연 전위로 이러한 흐름 전위를 이용한 자연 전위 탐사는 유체 흐름 뿐만 아니라 지층 유체에 대한 정보도 파악할 수 있는 탐사법이다. 지하 매질과 유체 사이에 존재하는 전기 이중층과 같이 입자가 대전하고 있을 때 여러 원인에 의해 유체가 유동하여 발생하는 계면 동전기 현상 중 하나인 흐름 전위는, 발생 기작이 복잡하고 측정 전위 값이 비교적 작아 잡음에 취약하다는 어려움도 있지만 이를 이용한 자연전위 탐사는 인공적인 송신원이 없어 탐사가 용이할 뿐만 아니라 반복성도 좋기 때문에 지층 유체 모니터링 탐사에 적용이 확대되고 있다. 이 논문에서는 지금까지 흐름 전위의 발생 기작에 대한 연구와 지배 방정식들을 정리하여 설명한 뒤, 매질의 물리적 특성 변화에 따른 흐름 전위 반응 특성 및 다양한 국내외 유체 흐름 자연 전위 탐사의 사례 분석을 수행하였다. 이 기술보고에서는 흐름 전위에 대한 이해도를 높임과 동시에 적용 가능한 다양한 분야를 소개함으로써, 국내에서의 흐름 전위를 이용한 자연전위 탐사의 현장 적용 방안을 제시하고자 한다.

• 한국재료학회지
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• 제5권2호
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• pp.191-196
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• 1995

비정질 PEEK 필름의 self-bonding강도는 접합시의 공정변수(시간, 온도, 그리고 압력)와 밀접한 관계가 있다. 본 연구에서는 이러한 공정변수의 효과를 규명하기 위하여 각기 다른 접합조건하에서 개발된 시편들의 self-bonding강도를 single lap-shear test를 통하여 측정된 각각의 전단 응력(shear strength)으로 나타내었다. 개발된 self-bonding강도는 접합온도가 증가함에 따라 증가하였으며, 접합시간의 1/4승에 일차함수적으로 비례증가하였다. 접합공정 중의 압력의 효과는 단지 초기 접합단계인 wetting에 기여하였을 뿐 self-bonding강도 자체에는 거의 영향을 미치지 않는 것으로 사려되었다. 결론적으로 비정질 PEEK 필름의 self-bonding현상은 현장에서의 실제 접합공정에서 어떠한 접착재료의 사용없이도 모재와 같은 강도를 개발하는데 무한한 가능성이 있는 것으로 판단되었다.

• 한국산학기술학회논문지
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• 제11권1호
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• pp.352-360
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• 2010

본 연구는 자연친화적인 힐클라임 스포츠 참가자의 참가동기, 몰입경험이 자아성취감과 생활만족에 미치는 영향을 규명하는데 그 목적이 있다. 이러한 목적을 달성하기 위하여 본 연구에서는 강원도 대관령과 미시령 힐클라임 대회에 참여하고 있는 성인 남녀를 대상으로 206명을 표집하여 SPSS/PC+ 11.0 Version과 AMOS 7.0을 사용하여 통계분석을 실시하였다. 이 연구의 결론은 다음과 같다. 첫째, 자연친화적 힐클라임 스포츠 참가자의 참가동기, 몰입경험, 자아성취감 및 생활만족에 대한 기술통계분석 결과 비교적 높게 나타났다. 둘째, 자연친화적 힐클라임 스포츠 참가자의 참가동기, 몰입경험, 자아성취감 및 생활만족 간의 관계를 알아보기 위해 Pearson의 적률 상관분석을 실시한 결과, 참가도기는 생활만족에 양(+)의 상관관계가 있으며, 몰입경험은 자아성취감에 양(+)의 상관이 있는 것으로 나타났다. 셋째, 자연친화적 힐클라임 스포츠 참가자들의 참가동기와 생활만족, 몰입경험과 자아성취감 간에는 인과적 관계가 있는 것으로 나타났다. 이러한 결과들로 보아 정부나 지역자치단체에서 지역주민들이 자연친화적인 환경에서 운동을 통한 삶의 질을 높일 수 있은 방향으로 정책을 펼쳐야 한다.

• 한국병원경영학회지
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• 제14권3호
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• pp.49-66
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• 2009

Purpose : This study was aimed at examining the relationships of university students' self-efficacy to creative disposition and creative thinking ability. Method : A descriptive study was conducted with a sample of 320 students enrolled 4-year-undergraduate academic programs major in nursing as well as elderly care management in one University located in Pusan, Korea. This study used: (a) 24 items of Self-Efficacy Scale originally developed by Kim & Cha(1996), and (b) 39 items of creative thinking ability and 16 items of creative attitudes in a Self-Report Form of Integrative Creativity Scale developed by Bak & Kang(2006). The data were analyzed by using Pearson correlation and hierarchical multiple regression methods. Result : University students' self-efficacy has significantly positive impact on creative thinking ability(p<.001) with 26.4% of the variance and creative disposition(p<.001) with 48.9%. Creative thinking ability as well as the disposition related to creativity that university students possessed were significantly influenced by efficacy on self-control and efficacy on taking difficult tasks. Conclusion : This result supports Social Cognitive Theory and Investment Theory of Creativity in terms that self-efficacy is the factor affecting fostering creative ability and demonstration of creativity potential to the real. This also implies that healthcare educational programs reinforcing students' self-efficacy would contribute to breed them to healthcare professionals with creative competency.

• 반도체디스플레이기술학회지
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• 제4권2호
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• pp.11-14
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• 2005

In plasma processing reactors, it is common practice to control plasma density and ion bombardment energy by manipulating excitation voltage and frequency. In this paper, a dually excited capacitively coupled rf plasma reactor is self-consistently simulated with a three moment model. Effects of phase differences between primary and secondary voltage waves, simultaneously modulated at various combinations of commensurate frequencies, on plasma properties are investigated. The simulation results show that plasma potential and density as well as primary self-dc bias are nearly unaffected by the phase lag between the primary and the secondary voltage waves. The results also show that, with the secondary frequency substantially lower than the primary frequency, secondary self·do bias remains constant regardless of the phase lag. As the secondary frequency approaches to the primary frequency, however, the secondary self-dc bias becomes greatly altered by the phase lag, and so does the ion bombardment energy at the secondary electrode. These results demonstrate that ion bombardment energy can be more carefully controlled through plasma simulation.

• 천문학회지
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• 제38권2호
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• pp.197-201
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• 2005

It is well known that a rotating bar potential can transport angular momentum to the disk and hence cause the evolution of the disk. Such a process is particularly important in disk galaxies since it can result in fuelling AGNs and starburst ring activities. In this paper, we will present the numerical simulations to show how this mechanism works. The problem, however, is quite complicated. We classify our simulations according to the type of Lindbald resonances and try to single out the individual roles they play in the disk evolution. Among many interesting results, we emphasize the identification of the origin of the starburst rings and the dense circumnuclear molecular disks to the instability of the disk. Unlike most of the other simulations, the self-gravitation of the disk is emphasized in this study.

• 경영과학
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• 제21권3호
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• pp.85-99
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• 2004

The retention of customer is an increasingly pressing issue in today's competitive environment. The proposes of this paper is a personalized defection detection and the procedure of prevention based on economic analysis of customer defection possibility, and behaviour state transition cost. This procedure is based on the observation that potential defectors have a tendency to take a couple of months or weeks to gradually change their behaviour before their eventual withdrawal. In this procedure, the SOM(Self-Organizing Map) is used to determine the possible states of customer behaviour from past behaviour data, and to prevent the defection of potential defectors, the proposed procedure recommends the desirable behaviour state for the next period based on the analysis of transition cost. and likelihood of defection. The case study has been conducted for a Korean on-line game provider to evaluate of this procedure.

• 아동학회지
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• 제13권2호
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• pp.189-201
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• 1992

The purpose of this study was to investigate the effectiveness of teaching personal safety skills for prevention of potential child sexual abuse in Korean society. The subjects of this study were 80 first grade female students, sampled from elementary schools in Seoul. The instruments of this study were the Personal Safety Questionnaire (PSQ) and 'What if' Situations Test (WIST) modified by the present researcher. The t-test and Pearson's correlation coefficient were applied to analyze the data of this study. The results of the analysis were (1) after the Behavioral Skills Training, the children of the training group showed a higher level of knowledge about child sexual abuse than the control group. (2) After the Behavioral Skills Training, the children of the training group showed more adequate self-defensive skills than the control group when they faced situations of possible child sexual abuse. (3) The higher the level of knowledge about child sexual abuse, the more adequate self-defensive skills in situations of child sexual abuse. These results supported the effectiveness of Behavioral Skills Training as preventive education on potential child sexual abuse.

• Bulletin of the Korean Chemical Society
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• 제32권2호
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• pp.620-624
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• 2011

In recent years, the study of self-assembly peptide used in drug delivery system has been attracted great interest from scientists. In the category are self-assembly peptides in the structure either with one hydrophobic surface and another hydrophilic or a hydrophobic head and a hydrophilic tail. Here, we focus on a novel designed peptide EYK with double amphiphilic surfaces, investigating on the capability of peptide as a carrier for hydrophobic compound model pyrene. The fluorescence data presented the dynamic process of the transfer, showing that the pyrene was in the crystalline form in peptide solution, and molecularly migrated from its peptide encapsulations into the membrane bilayers when the peptide-pyrene suspension was mixed with liposome vesicles. The results indicated that the peptide EYK could stabilize hydrophobic pyrene in aqueous solution and delivered it into EPC liposome as a potential carrier.