• Fisheries and Aquatic Sciences
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• 제16권1호
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• pp.25-34
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• 2013

Early ontogenic development in Siberian sturgeon Acipenser baerii was documented and the effects of different temperatures on embryonic and prelarval development were examined. Photograph-assisted data on morphogenesis in Siberian sturgeon prolarvae agreed well with published descriptions of their ontogeny and ecological behaviors, although certain aspects of differentiation, such as gill covering and scute development, could be rearing condition-sensitive. The present study provides the first characterization of the transient development of teeth during early larval stages; the pattern was congruent with the transition of prolarvae to exogenous feeding. From examinations of embryonic and prelarval development under different temperature conditions ($12-24^{\circ}C$), developmental speed was inversely related with temperature. Overall, hatchability was higher and hatching events were more synchronized at $20^{\circ}C$ than at lower temperatures. After hatching, similar patterns of temperature-dependency were observed in yolk sac absorption and the evacuation of the pigment plug. Our results suggest that the incubation of Siberian sturgeon embryos and prolarvae at temperatures close to $20^{\circ}C$ would be advantageous in hatcheries, based on reductions in the duration and uniformity of egg and prolarval developmental stages.

• 대한약학회:학술대회논문집
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• 대한약학회 2005년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.128-129
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• 2005

• 가정과삶의질연구
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• 제26권6호
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• pp.95-105
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• 2008

This study examined the mediation effect of life satisfaction between social support and loneliness. The subjects were two hundred and eighty fifth grade elementary school and second grade middle school adolescents in Seoul. The instruments used were questionnaires about loneliness and other factors relevant to loneliness. Social support factors existing in an adolescent's external environment include the support of parents, peers, and teachers. And life satisfaction as a psychological characteristic was concerned with the adolescent's sense of self, school life, home environment, and family relations. Data were analyzed by using the t-test, Pearson's correlation and regression. Major findings were as follows: (1) There were significant differences in parent and teacher support, satisfaction with school life, home environment, and family relations between early adolescents and mid adolescents. (2) Parental, peer, and teacher support, contentment with oneself, school life, home environment, and family relations were negatively related to the fifth-grade early adolescent's loneliness. Peer support and contentment with oneself, school life, and home environment were negatively related to the second-grade middle adolescent's loneliness. (3) Life satisfaction had a mediation effect between peer, parental, and teacher support and loneliness in fifth grade early adolescence. Whole life satisfaction had a mediation effect between only peer support and loneliness.

• International Journal of Concrete Structures and Materials
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• 제10권2호
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• pp.205-219
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• 2016

High-early-strength-concrete (HESC) made of Type III cement reaches approximately 50-70 % of its design compressive strength in a day in ambient conditions. Experimental investigations were made in this study to observe the effects of temperature, curing time and concrete strength on the accelerated development of compressive strength in HESC. A total of 210 HESC cylinders of $100{\times}200mm$ were tested for different compressive strengths (30, 40 and 50 MPa) and different curing regimes (with maximum temperatures of 20, 30, 40, 50 and $60^{\circ}C$) at different equivalent ages (9, 12, 18, 24, 36, 100 and 168 h) From a series of regression analyses, a generalized rate-constant model was presented for the prediction of the compressive strength of HESC at an early age for its future application in precast prestressed units with savings in steam supply. The average and standard deviation of the ratios of the predictions to the test results were 0.97 and 0.22, respectively.

• 한국콘텐츠학회논문지
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• 제10권7호
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• pp.142-148
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• 2010

20세기 초 근대성의 모순이 첨예하게 드러나고 테크놀로지의 발달에 따라 문자문화에서 시각문화로의 패러다임이 전환하는 사회 속에서 벤야민은 당대가 직면한 사회 역사적인 문제들의 해결책을 실천적으로 제시하고자 했다. 문화산업을 비판한 아도르노와는 대조적으로 그는 새로운 테크놀로지의 발달에 의해 등장한 대중예술매체에서 기존의 고정된 가치질서들을 전복시키고 현실을 변혁하는 가능성을 발견한다. 그리고 이러한 유토피아적 가능성은 비록 파편적이기는 하나 디즈니 초기 애니메이션에 대한 그의 사유에서 나타난다. 본 논문은 벤야민이 사유했던 유토피아적 가능성이 초기 디즈니 애니메이션에서 어떻게 구현되고 있는지를 고찰한다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 추계 학술논문 발표대회
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• pp.1-5
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• 2008

In this study, batcher plant composition test and mock-up test were carried out to conduct comparison and analysis on flow behavior and strength properties of concrete at early age. As a result, it was found that slump and amount of air in batcher plant composition test reached the target range. As for compressive strength, composition using HESPC showed the most excellent strength development. In mock-up test which was carried out to find out the strength properties, two methods with specimen and core test body both revealed HESPC as the most excellent composition. However, strength estimation with ultrasonic survey presented less reliable data. As a result of the previously conducted indoor composition test and the mock-up test in this study, target performance of concrete at early age was 4day/cycle. It was found that the optimum conditions that meet the required strength, 5MPa/18hr and 14MPa/36hr in mullion and transom are; curing temperature above 15℃, W/B 45%, unit-water 165kg/㎥ and CHC cement.

• 한국구조물진단유지관리공학회 논문집
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• 제14권5호
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• pp.63-71
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• 2010

본 논문은 프리캐스트 콘크리트 구조물의 조기강도를 촉진시키기 위한 양생공법 중에서 증기양생에 대한 연구내용으로서, 콘크리트 원주형 공시체와 목업체의 실험을 통하여 초기재령에서 요구되는 강도가 발현될 수 있는 증기양생주기와 최고온도를 정량화하여 최적 증기양생온도주기를 고찰하였다. 또한 고온의 증기양생으로 인하여 발생된 콘크리트의 높은 온도와 거푸집 제거시에 발생되는 균열의 발생원인과 대책에 대하여 기술하였으며, 궁극적으로는 PC 부재를 생산하는 과정에서의 조기강도발현과 품질확보를 동시에 만족하면서 경제성 있는 제작방법을 제시하였다.

• 아동복지연구
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• 제16권2호
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• pp.67-85
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• 2018

The purpose of this study was to analyze the trends in the studies on safety education of infant-early childhood teachers in order to provide basic data for a variety of studies in the field of child education. We consulted a total of 59 dissertations and journals articles on the safety education of infant-early childhood teachers published from 2008 to 2018. Our results were as follows: First, we found that the largest number of studies concerned safety awareness, followed by status and awareness, safety actions, safety education analysis, safety accidents and countermeasures, emergencies, development of programs, and teacher education. Second, we found that the most popular targets were child-care of teachers, followed by teacher-trainees, and center directors. Third, among the types of studies, we found that investigative quantitative studies were the most prevalent, followed by correlational studies, qualitative studies, and experimental studies. In terms of methods of gathering data, we found that questionnaires were the most commonly used, followed by qualitative studies, literature reviews, qualitative/quantitative studies, and quantitative literature reviews.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2781-2784
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• 2007

Early detection of a disease is important to tackle treatment issues in a better manner. Several diagnostic techniques are in use, these days; for such purpose and tremendous research is going on to develop newer and newer methods. However, more work is required to be done to develop cheap and reliable early detection techniques. Micro-fluidic chips are also playing key role to deliver new devices for better health care. The present study focuses on a review of recent developments in the interrogation of different techniques and present state-of-the-art of microfluidic sensor for better, quick, easy, rapid, early, inexpensive and portable POCT (Point of Care testing device) device for a particular study, in this case, bone disease called osteoporosis. Some simulations of the microchip are also made to enable feasibility of the development of a blood-chip-based system. The proposed device will assist in early detection of diseases in an effective and successful manner.

• 한국생활과학회지
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• 제22권4호
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• pp.511-524
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• 2013

The purpose of this study was to examine the impact of the communicative competence of early childhood teachers on their teaching efficacy and job satisfaction in an attempt to provide some information on the development of the communicative competence of early childhood teachers. Study results show that, first, the teaching efficacy of early childhood teachers differed according to their age, education and career level and their communicative competence differed according to their career level. Second, communicative competence had a statistically significant positive correlation with teaching efficacy and job satisfaction. Third, among the sub-factors of communicative competence, focusing attention and responding exerted a statistically significant positive influence on teaching efficacy. Among the sub-factors of communicative competence, focusing attention, analyzing and evaluating exerted a statistically significant positive influence on job satisfaction.