• 한국토양비료학회지
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• 제50권6호
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• pp.588-597
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• 2017

Food waste has been recognized as a critical problem in Korea and many research was conducted to efficiently reutilize or treat food waste. Main purpose of this research was to evaluate a feasibility for producing fermented organic fertilizer with mixture of earthworm cast (EC). Four different treatments were mixed with food waste and EC at the rate of 0, 10, 20, and 30%, respectively. Total days of composting experiment were 84 days and each sub samples were collected at every 7 days from starting of composting. Results showed that inner temperature in composting was increased to $70{\pm}4^{\circ}C$ within 5~10 days depending on mixing ratio of EC. Among different treatment, the highest increase of inner temperature was observed in treatment mixed with food waste and EC 30%. After finishing composting experiment, maturity was evaluated with solvita and germination test. Maturity index (MI) of each treatment was ranged between 5~7 indicating that manufactured fertilizer was curing or finished stage. Calculated germination index (GI) was at the range of 104~116 depending on mixing ratio of EC. Both MI and GI showed that manufactured fertilizer was suitable for fertilizer criteria while control (FW only) was not adequate for composting. Overall, earthworm cast can be utilized for improving compost maturity by mixing with food waste and more research should be conducted to make high quality of food waste compost with earthworm cast in agricultural fields.

• 영재교육연구
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• 제21권1호
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• pp.1-17
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• 2011

본 연구의 목적은 영재아와 일반 초등학교 학생의 독서성향과 진로태도 성숙 및 자기주도적학습 특성을 비교해보고 그 관계를 살펴보는 데에 있다. 영재아와 일반아의 독서성향을 비교하였을 때, 영재아는 일반아보다 독서흥미, 독서경험이 유의미하게 높은 결과를 나타냈으며 이는 독서수준이 높다는 결과와 일치하였다. 또한 영재아와 일반아의 진로태도성숙을 비교한 결과 진로태도성숙 하위 요인 중에서 결정성, 목적성, 확신성은 영재아가 일반아보다 유의미하게 높게 나타났다. 영재아와 일반아의 자기주도적학습 특성을 비교한 결과 모든 항목에서 영재아는 일반아보다 높은 점수를 나타냈다. 독서 성향과 진로태도성숙, 또 독서성향과 자기 주도적 학습 특성 사이에는 정적으로 유의미한 상관관계가 있었다.

• 산업기술연구
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• 제17권
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• pp.219-225
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• 1997

The maturity concept was adopted to predict the strength of concrete, which was subjected to several temperature levels and variable curing conditions. Penetration test and compressive test were conducted to measure the initial and final setting time and the compressible strength of concrete specimen, respectively. Also, the temperature and time were measured at some time intervals for calculating the maturity. The initial and final setting were delayed as the w/c ratio increased and curing temperature decreased. The relationships at the relative strength and the equivalent age were proposed at different w/c ratio for the several temperature curing conditions, and these were applied for the variable curing conditions.

• Applied Biological Chemistry
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• 제42권1호
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• pp.45-48
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• 1999

숙기가 다른 쌀을 분쇄한 다음 메쉬를 이용한 누적입도분포는 숙기별로 유의적인 차이가 없었으나 60메쉬 또는 80메쉬 통과분은 숙기별로 유의성이 있었다. 쌀알의 경도는 조생종이 가장 컸고, 중만생종이 가장 작았으며 20메쉬 미통과분과 정상관을, 60메쉬 또는 80메쉬 이상 통과분과는 부상관을 보였다. 입도크기별 아밀로그래프 최고점도는 입도가 고울수록 증가하였으나 60메쉬 통과분과 80메쉬 통과분은 유의적인 차이를 보이지 않았다.

• Computers and Concrete
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• 제6권1호
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• pp.19-40
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• 2009

This paper describes the development of modified heat of hydration and maturity-strength models for concrete containing fly ash and slag. The modified models are developed based on laboratory and literature test results, which include different types of cement, fly ash, and slag. The new models consider cement type, water-to-cementitious material ratio (w/cm), mineral admixture, air content, and curing conditions. The results show that the modified models well predict heat evolution and compressive strength development of concrete made with different cementitious materials. Using the newly developed models, the sensitivity analysis was also performed to study the effect of each parameter on the hydration and strength development. The results illustrate that comparing with other parameters studied, w/cm, air content, fly ash, and slag replacement level have more significantly influence on concrete strength at both early and later age.

• 한국가금학회지
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• 제2권1호
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• pp.4-6
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• 1975

Field trials and research works have shown that the sexually retarded pullets are better equipped to lay larger eggs at the commencement of lay than the pullets grown under the natural conditions with no control over the rate of maturity. The method of delaying the sexual maturity by restricting the nutrient intake is receiving a considerable attention from the research workers, since the nutrient restriction can be a method of reducing the rearing cost. Many experiments were carried out to study the effect of different methods of restricting the nutrient intake of the chicken. But the comparisons between these experiments are difficult because of the differences in the environment, management, type of breed and feed, and in the length of the time during which the feed intake was restricted. In addition the comparisons were not made on an economic basis in these experiments. This experiment was designed to provide information on the reproductive responses to three different methods of restricting the nutrient intake in a egg type stock and to establish which methods are economically profitable. (omitted)

• 대한공업교육학회지
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• 제37권1호
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• pp.21-41
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• 2012

본 연구는 학교청소년의 비행과 진로성숙도와의 관계를 파악하여 진로성숙도를 높이는 활동이 청소년비행에 대한 보호요소가 되는지를 살펴보는데 그 목적이 있다. 연구문제는 첫째, 학교청소년의 비행 정도는 어떠한가? 둘째, 학교청소년의 비행과 진로성숙도와의 상관관계는 어떠한가? 셋째, 학교청소년의 비행경험 여부에 따른 진로성숙도 차이는 어떠한가? 이다. 연구의 결과 첫째, 학교청소년의 55.8%는 지난 1년간 비행측정 문항에서 묻고 있는 14가지 비행행위 중 1가지 이상의 비행을 저지른 경험이 있는 것으로 나타났으며, 남학생의 비행 정도가 여학생 보다 높은 것으로 나타났다. 둘째, 학교청소년의 비행과 진로성숙도 간에는 유의미한 상관관계가 발견되지 않았다. 그러나 비행과 진로성숙도 하위요인 중 목적성 간에는 유의미한 부적 상관관계가 있었고, 독립성/결정성과는 유의미한 정적인 상관관계가 있었다. 비행유형별로는 지위비행 II(가출, 무단결석)는 진로성숙도 전체와 부적인 상관관계가 있었으며, 진로성숙도 하위요인 중 목적성/확신성 요인과 부적인 상관관계가 있었다. 셋째, 비행경험이 있는 집단과 비행경험이 없는 집단 간 진로성숙도 차이는 유의미한 차이가 발견되지 않았다. 그러나 진로성숙도 하위요인 중 목적성 수준은 비행을 경험하지 않은 집단이 비행을 경험한 집단보다 높게 나타났다. 비행유형별로는 지위비행 II(가출, 무단결석)를 저지른 경험이 없는 집단이 비행을 저지른 경험이 있는 집단보다 진로성숙도가 유의미하게 높았으며, 진로성숙도 하위요인 중 목적성과 확신성 수준이 유의미하게 높았다. 본 연구를 통해 진로성숙도 목적성 요인이 청소년 비행에 대한 보호요소가 될 수 있음을 시사 하였다. 또한 진로성숙도를 높이는 활동이 가출, 무단결석을 감소 시킬 수 있음을 시사 하였다. 이러한 연구 결과들은 학교청소년의 비행예방에 대한 진로상담적 접근 및 개업전략을 위한 기초자료가 될 수 있을 것이다.

• 수산해양기술연구
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• 제46권3호
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• pp.223-231
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• 2010

This paper showed the difference between the selectivity of gill net by least square method with polynomials in Kitahara's and that by maximum likelihood analysis for Japanese sandfish and Korean flounder. Catch experiments for Japanese sandfish using commercial vessels off the eastern coast of Korea were conducted with six different mesh sizes between October and December 2007 and those for Korean flounder with five different mesh sizes between 2008 and 2009. The mesh size of 50% probability of catch corresponding to biological maturity length of fish was not different between that by least square method and that by maximum likelihood analysis for Japanese sandfish, however, a little different for Korean flounder, that is, those mesh sizes of 50% probability of catch for biological maturity length of Korean flounder were 10.6cm and 10.1cm by least square method and maximum likelihood analysis, respectively.

• 한국작물학회지
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• 제12권
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• pp.43-48
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• 1972

CEPA를 답전작 및 우기전에 수확이 가장 빨리 촉진되면 또 니코친 함량이 저감되는지를 알고저 Yellow Special A 품종을 공시하여 적심 직후해당 농도의 CEPA 수용액을 살포한 후 일정기간을 두고 수확하여 처리수준별 성숙도 및 전 alkaloid함량을 조사하였던 바 그 결과는 다음과 같았다. 1) 처리농도가 높을수록 잎담배 성숙에 미치는 효과가 컸으며 그 효과는 처리 후 6-11일간에 있어서 현저하였다. 2) CEPA는 엽표면에만 처리해도 효과가 있으며 성숙촉진효과는 처리부분에 있어서 더욱 뚜렷하였다. 3) 처리농도가 높을수록 잎담배의 전 alkaloid 함량이 감소되는 경향이 있으며 그 효과는 성숙촉진작용후에 더 크게 나타났다. 4) CEPA의 성숙촉진작용은 성수기에 가까운 하부엽에서 컸고 alkaloid 축적억제작용은 반대로 숙기에 도달하지 않은 상부엽에서 컸다. 그러나 적기수확엽에 있어서는 축적억제효과가 부위에 관계없이 같았다. 5) CEPA 처리는 수량에 변화를 주지 않았으며 시용 적정농도는 500-2,000ppm 사이라고 느껴졌다. 6) CEPA의 성숙촉진 및 alkaloid 합성억제작용의 기구에 관하여는 금후 더욱 연구할 필요가 있다고 보았다.

• 한국학교ㆍ지역보건교육학회지
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• 제18권1호
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• pp.99-110
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• 2017

Objectives: The purpose of this study was to examine the effect of the field practice of health science majors on their career attitude maturity in our country in an effort to determine influential factors. Methods: The subjects in this study were 220 selected health science majors in three different colleges located in North Gyeongsang Province and South Chungcheong Province. A survey was conducted with structured questionnaires from September 1 to 10, 2016. As for statistical analysis. a statistical package SPSS 20.0 was used. Results: The factors of the field practice of the health science majors that affected their career attitude maturity were the career of people in charge(${\beta}=.145$, p-.034) and the content of field practice(${\beta}=.233$, p=.015), which were the factors of the institution for field practice, and the relationship between people in charge and trainees(${\beta}=.299$, p=.008) and satisfaction with field placement(${\beta}=-.262$, p=.013) that were the factors of field practice tasks were also influential. The influence of these factors were statistically significant. Conclusions: Institutions that provide health science majors with the opportunity of field practice should try to improve the competencies of people in charge, to ensure the substantiality of field practice in content and to develop standardized manuals for field practice. In schools, professors who are in charge of field practice should offer intensive guidance and feedback on problems with field practice. These efforts are expected to elevate the career attitude maturity of students.