• 환경영향평가
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• 제14권1호
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• pp.1-15
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• 2005

This study aims to analyze the objectives of environmental education in Environmental Impact Assessment (EIA) and the Education for Sustainable Development(ESD) factors used EIA in 'ecology and environment' textbook, and finally to analyze the situation and contents level of EIA domain in textbook to explore the possibility of the positive availability of EIA domain in high school for realization of effective ESD. To analyze the objectives of environmental education in EIA and ESD factors used EIA, researchers used the text, the activity and the teaching tip in three kinds of 'ecology and environment' textbook by the 7th curricula as the object of analysis. Framework to analyze the objectives of environmental education in EIA is the category of environmental education objectives of UNESCO presented according to 'Tbilisi Intergovernmental Conference on Environmental Education' and framework to analyze ESD factors used EIA is developed on the basis of the theory about EIA and ESD factors updated in this study. In conclusion, it proves that the EIA domain through the activity is effective for realization of ESD. According to the analysis of the study, it is proposed that the follow-up studies on the improvement of EIA domain in textbook in both quality and quantity as well as 'the teaching & learning methods and various development of teaching materials, etc: based on the emphasis on the activity are needed to progress steadily for realization of effective ESD in high school in the future.

• International journal of advanced smart convergence
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• 제4권1호
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• pp.145-153
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• 2015

Friction Stir Welding (FSW) is a solid state welding that could successfully weld the difficult-to-weldmaterials such as an aluminum alloy. In this welding process, the stirrer of the welding tool is one of the important factors for producing the perfect sound joint that indicates the higher joint strength. So, this report aims to apply the friction stir welding using various stirrer geometries to weld the AA6063-T1 aluminum alloy butt joint, investigates the mechanical properties of the joint and then compares the mechanical properties with the microstructure of the joint. An experiment was started by applying the friction stir welding process to weld a 6.3 mm thickness of AA6063-T1 aluminum alloy butt joint. A study of the stirrer geometries effect such as a cylindrical geometry, a cone geometry, a left screw geometry and a right screw geometry at a rotational speed of 2000 rpm and a welding speed of 50-200 mm/min was performed. The mechanical properties such as a tensile strength and a hardness of the joint were also investigated and compared with the microstructure of the joint. The results are as follows. A variation of FSW Stirrer shape directly affected the quality AA6063-T1 aluminum alloy butt joint. A cylindrical stirrer shape and a cone stirrer shape produced the void defect at the bottom part of the weld metal and initiated the failure of the joint when the joint was subjected to the load during the tensile test. Left and right screw stirrer shapes gave the sound joint with no void defect in the weld metal and affected to increase the joint strength that was higher than that of the aluminum base metal.

• Journal of Information Technology Applications and Management
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• 제17권4호
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• pp.157-180
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• 2010

The IT services industry is considered as the leading industry of the ubiquitous age that raises a nation's overall productivity and efficiency. Therefore, it is receiving increasing attention as the industry that can bring about economic takeoff and successful overseas market entrance for the next generation. In order to achieve successful development, the industry should be competitive and armed with strategies that well demonstrate the characteristics of IT services. Therefore, it is important to explore the competitive factors of the industry for its qualitative development from the perspectives of IT services industry policies and as well as IT services companies. This study categorized IT services into three types-system integration, IT consulting, and IT outsourcing- and then examined the competitive factors of each service type and their relationships with financial and non-financial performances. In conclusion, the current competitiveness of domestic IT services industry is attributed to institutions environment rather than its competitive advantages in technology, quality, know-how, and highly qualified human resources. In order to facilitate the sound growth of the IT industry and seek reasonable market competition, the environment that puts its priority on the improvement of institutions environment and the ability to carry out a project needs to be established. In all, this study can be utilized as an important knowledge for the establishment of polices to foster IT services industry and of strategies that raise competitiveness to maximize the performances of companies.

• The Journal of Asian Finance, Economics and Business
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• 제7권3호
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• pp.73-85
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• 2020

The study aims to provide better understanding of sustainable earnings by a comprehensive analysis of earnings persistence of business firms in Vietnam as an example of developing economies in South-East Asia. Dataset of 1,278 publicly listed firms (excluding banking and financial services firms) on Vietnam Stock Exchange for the period from 2008 to 2017 was collected. By applying fixed effect regression model, the empirical results provided the basis to measure the persistence index (Pers index) and find low level of their earnings persistence. The literature of earnings quality analysis in developed countries suggests earnings persistence as a noteworthy determinant of future earnings forecast and stock valuation. However, research of sustainable earnings in developing countries is still highly underdeveloped. For Vietnamese listed firms, the average Pers index was estimated for the period from 2008 to 2010, indicating low level of earnings persistence. We also incorporated earnings persistence level into future earnings forecast by running the quintile regression model divided the data into four equal levels and conducted each section independently to see the difference in each percentile, thence assessed the factors' influence on the specific model. The findings provide important information on the expected returns of firms, especially helping investors make sound decisions.

• KIEAE Journal
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• 제8권4호
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• pp.29-36
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• 2008

The rapid industrialization since the 1960s has caused considerable changes in the appearance of Korean cities. The huge demand and cityward tendency derived from the increase of population with such the expansion from 9 millions in 1960 to 43 millions in 2003, have resulted in number of problems such as the falling-off in the quality of life, amenity, and safety. And above all, the urban identities is not to be found obviously in the cities. With regard to these problems, the re-creation of cities should be emphasized to make environmental, economical, and social improvements and to restore human-oriented activities. In the course of making new improvements cities need to preserve the characteristics and maintain the concordance with their environments. In other words, the restoration of cities ought to be made in the aspect of continuity, which means the accession of genetic factors inherent in cities. In this background, concerning about the system on apartment house especially relating to environmentally sound restoration and comparing with that of Japan, this study proposes the direction needed in the development of urban space.

• 한국주조공학회지
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• 제24권6호
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• pp.314-322
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• 2004

The CaO crucible is expected to serve as a useful tool for melting Ti and its alloys due to its thermodynamic stability. However, tjere still remain problems that need to be resolved in the melting of Ti and its alloys to enable commerical use. The cause of the defects of Ti-6AI-4V alloy castings melted in the CaO crucible were examined and compared with induction skull melting. The key factors of the melting technique using the CaO crucible, affecting the quality of Ti-6AI-4V alloy castings, were investigated. Defects of the Ti-6AI-4V alloy castings are caused by the chemical reduction of CaO by Ti. Pressurizing with argon gas in a vacuum induction chamber is effective for reducing the defects. Preheating of the charged material in the crucible and quick pouring into a mold of lower temperature, just after melting down, are important for produsing sound Ti-6AI-4V castings.

• Plant Breeding and Biotechnology
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• 제6권4호
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• pp.454-462
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• 2018

Yield and grade are the key factors that affect production value of peanut. The objective of this study was to identify QTLs for pod yield, hundred-seed weight, and total sound mature kernel (TSMK). A total of 90 recombinant inbred lines, derived from Tamrun OL07 and a breeding line Tx964117, were used as a mapping population and planted in Brownfield and Stephenville, Texas. A genetic map was developed using 1,211 SNP markers based on double digest restriction-site associated DNA sequencing (ddRAD-seq). A total of 10 QTLs were identified above the permutation threshold, three for yield, three for hundred-seed weight and four for TSMK, with LOD score values of 3.7 - 6.9 and phenotypic variance explained of 12.2% - 35.9%. Among those, there were several QTLs that were detected in more than one field experiment. The commonly detected QTLs in this study may be used as potential targets for future breeding program to incorporate yield and grade related traits through molecular breeding.

• 한국보육지원학회지
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• 제18권2호
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• pp.19-38
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• 2022

Objective: The goal of this study is to develop an instrument for measuring the quality of teacher support for children's play (age 3-5) based on the Play Practice Resources for Teachers presented in the 2019 revised Nuri Curriculum. Methods: The subjects of this study were 333 early childhood educators. Exploratory and confirmatory factor analysis, as well as correlation analysis were all performed to confirm construct validity and concurrent validity. The reliability of each factor was verified using Cronbach's alpha. Results: The Preschool Teacher Play Support Scale (PTPSS) was finalized with 25 items, which included the following four sub-factors: interaction, play materials, play space, and play safety. The concurrent validity was also confirmed through significant correlations between the existing measures such as the Teacher Self-Efficacy Scale, the Teaching Efficacy Scale for Play, and the Teacher-Toddler Interaction Scale. The reliability of each factor was also desirable. Conclusion/Implications: The PTPSS was verified as a sound measure quantifying the play support behavior of teachers who respect the autonomy and initiative of young children which is being pursued by the 2019 revised Nuri Curriculum.

• 한국음향학회지
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• 제29권4호
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• pp.251-257
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• 2010

본 논문에서는 액체 매질 내 기포운에 의한 초음파의 감쇠 및 분산 특성을 다룬다. 액체 내 기포운은 다양한 기작에 의해 발생되며 이에 따라 기포운을 구성하는 기포들의 크기와 분포가 다양한 양상을 가지게 된다. 따라서 기포들의 크기와 분포에 따라 기포운의 감쇠와 분산 특성이 어떻게 변화하는지에 중점을 둔다. 특히 아직 보고된 바 없는 나노 기포운의 감쇠 및 분산 특성에 대하여 조명하고자 한다. 수치해석 결과, 기포운의 음향 감쇠 및 분산 특성은 구성 기포들의 첨예도에 따라 크게 변화하는 것으로 나타났다. 본 연구는 기포운 내 음향 전파의 심도 있는 이해에 일조할 것으로 기대한다.

• 한국산학기술학회논문지
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• 제18권12호
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• pp.434-442
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• 2017

본 연구는 부산지역 교정환자를 대상으로 부정교합의 종류와 교정치료에 대한 인식이 삶의 질에 미치는 영향을 파악하고, 부정교합의 종류에 따른 맞춤형 교육프로그램을 개발하여 삶의 질 향상의 기초자료로 삼고자 한다. 2015년 12월부터 약 6개월간 설문조사하여 최종 472부를 분석하였다. 연구결과는 부정교합의 가족력은 I급은 없음, II급, III급은 있음으로 응답하였고, 교육 실천은 자주실천에서 부정교합의 종류에 따른 차이를 보였다(p=0.003). 교정치료의 만족감에서는 불편감은 I급은 기간, II급과 III급은 통증(p=0.035)이였고, 통증부위에서는 치아가 가장 많았으나 II급에서 가장 높아 차이를 보였다(p<0.001). 교정치료 만족도에 따른 삶의 질에서는 현재 만족도가 높을수록, 자신감이 보통인 경우 삶의 질이 높았으며, 교정치료 시작 계기에서는 발음문제(p=0.013), 저작 불편감(p<0.001), 턱관절 소리(p<0.001)가 있는 경우 삶의 질이 낮았다. 구강건강관련 삶의 질에 미치는 요인으로는 교정치료시기(p<0.001), 현재 만족감(p<0.001), 자신감 변화(p=0.003), 주관적 치아상태(p=0.008), 교합의 종류(p=0.019)순으로 영향을 미쳤다. 따라서 교정치료를 받는 환자들의 구강건강 상태를 면밀하게 분석하고 맞춤형 교정상담프로그램을 통하여 교정기간에도 삶의 질을 향상시킬 수 있어야 한다.