• 폴리머
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• 제38권5호
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• pp.613-619
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• 2014

The polypropylene/polyamide elastomer (PP/PAE) blends were prepared by melt mixing. PP and PAE in PP/ PAE were immiscible completely. The size of PAE domains was large and the clear gap in the interface between PP and PAE existed, which did not meet the conditions enhancing toughness of polymers by elastomer. Therefore, maleic anhydride grafted polypropylene (MP) was used to improve the miscibility between PP and PAE. The miscibility between PP and PAE was improved and the size of dispersed phase PAE decreased by introducing MP. The crystallization of PP became easier by introducing PAE as a nucleating agent. With the increase of PAE content, the melt-crystallization temperatures of PP components in PP/PAE/MP blends increased gradually. The melt-crystallization of the polytetramethylene oxide segment of PAE component in PP/PAE blends were hampered by PP component. In addition, PAE can enhance significantly the toughness of PP, and the tensile strength and modulus did not decrease.

• Elastomers and Composites
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• 제53권2호
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• pp.57-66
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• 2018

Styrene-butadiene rubber (SBR), reinforced with different contents of silica (with or without modification using silane coupling agents), was prepared by a modified sol-gel method involving hydrolyzation of tetraethoxysilane over an acid catalyst. The structures of the as-prepared samples were characterized using various techniques, such as scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The mechanical properties of the as-prepared samples were discussed in detail. The results revealed an increasing of the storage modulus (G') with increase in the silica content without modification. In contrast, G' decreased after modification using silane coupling agents, indicating a reduction in the silica-silica interaction and improved dispersion of silica in the SBR matrix. Both tensile stress and hardness increased with increase in the silica content (with modification) in the SBR matrix, albeit with low values compared to the samples with un-modified silica, except for the case of silica modified using (3-glycidyloxypropyl) trimethoxysilane (GPTS). The latter observation can be attributed to the special structure of GPTS and the effort of oxygen atom lone-pair.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제2권4호
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• pp.293-297
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• 2021

The oriental stork (Ciconia boyciana) is listed as an endangered species internationally. Its resident population has been extirpated in South Korea since 1971. Its predicted historical habitat included forests (54%), rice paddy fields (28%), grasslands (17%), river-streams (less than 1%), and villages (less than 1%) based on pre-extirpation records in a previous study. However, habitat attributes of recently reintroduced oriental storks since 2015 remain unknown. To examine habitat use patterns and home ranges of recently reintroduced oriental storks, 2015-2017 tracking data of 17 individuals were used to analyze their spatial attributes with a Kernel Density Estimate method and breeding status. Their habitat use patterns from peripheral to core areas were highly associated with increasing rice paddy fields (26%) and decreasing forested areas (55%). Scale-dependent home ranges were 51% smaller for breeders than for non-breeders on average. Our study results highlight that the habitat use pattern of reintroduced oriental storks seems to be comparable to the historical pattern where the used area is likely to be more centralized for breeders than for non-breeders in South Korea. Furthermore, the direction of habitat management for oriental storks should focus on biodiversity improvement of rice paddy fields with chemical free cultivation and irrigation.

• 한국환경복원기술학회지
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• 제15권1호
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• pp.73-87
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• 2012

This study was conducted to provide sustainable measures for conservation and management to protect valuable natural/ecological resources, offer differentiated quality assurance services for eco-tourism products, and explore measures for eco-tourism certification/designation systems. To achieve its goals, the study discussed domestic and overseas trends and literatures that concern eco-tourism certification/designation system and investigated case studies that were presently operational. A group of experts and a group of non-experts were surveyed separatedly to investigate the awareness of the national eco-tourism certification/designation system. The results from the investigation indicate that Europe, since the late 1990s to early 2000, has actively introduced a system that establishes and operates a dedicated institution, and European members have created a cooperation framework to formulate international partnerships and develop standardized assessment benchmarks to adhere to the goals of the system, the period for certification was designated from one year to five years, and renewals were granted based on periodic monitoring and reassessment. In Korea, from early 2000, the Ministry of Culture, Sorts and Tourism and other organizations have certified product quality and assessed travel products and national park tour programs. The certification period was established to be set between one and three years, and the vast majority were not reassessed. Upon investigating the results for awareness of national eco-tourism certification/designation system, a high number of respondents agreed with the need to establish a eco-tourism certification/designation system (90% of respondents), and the respondents cited eco-tourism quality assurance, conservation of value, means to maintain established institutions, and environmental education and information as reasons for needing a certification/designation system. In Korea, a certification/designation system for the eco-tourism industry is presently in operation, but the system regulates target institutions based on their characteristics. Therefore, this study proposes its suggestions via various categories, including designated institutions, designated purpose, designated subjects, designated organization, laws, regulations, and incentives.

• 전기학회논문지
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• 제67권2호
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• pp.186-193
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• 2018

Generally, it is difficult to operate moveable-weir due to the expensive cost of the facility management and manpower consumption. Also, when it is installed in a remote area, there is a problem that the cost of connection for power system increases as well as the operating cost. Therefore, this paper proposes an optimal design algorithm to replace an existing power system with an Eco-friendly power supply system for movable-weir using PCS, PV module and lithium-ion battery. Also, this paper proposes a modeling method of environment-friendly power supply system for a movable-weir based on the PSCAD/EMTDC S/W and implements 5[kW] prototype environment-friendly power supply system. As a result of the performance test using the S/W modeling and the prototype system, it is confirmed that the proposed system has stable characteristics in the independent operation mode and the interconnection mode.

• 한국의상디자인학회지
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• 제17권1호
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• pp.117-130
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• 2015

As environmental issues have become a worldwide concern after the 20th century, the idea and the term of 'green growth development' has become familiar to the public. After 2008, the green growth development dramatically became an important ideology in Korea; thus industries, studies and product investments in relation are in active progress. Following the trend, the latter major unit of the middle school textbook "Technology & Home Economics" was named the revision of elementary, middle and high school textbooks in 2009. The learning goal of 'green' or 'eco-friendly' of the revised edition of the textbook will guide the middle school students to have better understanding of the issues of clothing habits and the environment. Furthermore, students will be able to apply the 'green' concepts in their real life and put eco-friendly clothing habits into action. Thus, the practice of effective learning will depend on the quality of the current issue of the textbook. Therefore this study analyzes the eco-friendly contents of the semi-unit from 7 different textbooks and presents an example of textbook production to the preliminary teacher of home economics.

• 한국콘텐츠학회논문지
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• 제13권11호
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• pp.1004-1013
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• 2013

본 연구는 자연재해 교육이 초등학교 저학년 통합학급 아동의 환경친화적 태도에 미치는 효과를 알아보고자 하였다. 이를 위하여 G광역시에 위치한 C초등학교 1학년 통합학급 2곳에 재학중인 일반아동 45명과 발달지체아동 2명을 선정하였다. 본 프로그램에 참여를 원하는 반을 실험집단, 다른 한 반은 비교집단으로 정하였다. 1학년 2학기에 총 18회기의 실험처치를 실시하였다. 자연재해 교육의 효과는 Musser와 Diamond가 제작한 CATES-PV를 기초로 허윤정이 수정 번안한 도구를 사용하여 측정하였다. 그 결과 자연재해 교육은 초등학교 저학년 통합학급 아동의 환경친화적 태도를 증진시키는데 효과적인 것으로 나타났다. 본 연구의 자연재해교육을 받은 아동들의 동식물 대한 애호와 관심, 생명에 대한 존중의식, 인공적인 환경 보다 자연환경에 대한 선호, 자연보호, 자원절약 등 현재 환경 관련 교육 이 목표로 하고 있는 능력, 태도가 증진되었다는 결과는 현재 우리나라 아동들을 위한 자연재해 교육에 대한 의미와 범위를 재고해 봐야할 필요성을 제시한다.

• 반도체디스플레이기술학회지
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• 제19권4호
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• pp.116-120
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• 2020

In this paper, we developed an electrochemical glucose sensor strip using a paper substrate. The paper glucose sensor strip is eco-friendly because it uses paper as a substrate, and it has the advantage that it can be manufactured only with four printing, drying and cutting processes. The paper glucose sensor is significantly simplified by the production process than the conventional glucose sensors because the production of only four printing on the paper substrate. In this paper, eco-friendly tracing paper was used to develop a paper glucose sensor strip, and screen-printing technology was used to form a carbon/silver electrode, insulating layer and glucose oxidase(GOD) layer. The developed paper glucose sensor strip has a flat structure with a size of 30 × 4.6 ㎟, and blood injection is a type of direct contact with the exposed enzyme layer above the strip. In this paper, the performance of paper glucose sensor strips was evaluated by analyzing the cyclic voltammetry(CV) and chronoamperometry(CA) characteristics.

• 한국환경교육학회지:환경교육
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• 제23권3호
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• pp.62-81
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• 2010

We are easily supposed to think that outdoor EE can help make Eco-Sense, furthermore 'Eco' means nature and natural resource itself. Relatively we are likely to think indoor EE is something theoretical or knowledge-oriented. It comes from our strong beliefs going into nature would be best choice for feeling Eco-mind. But every place in our daily life could be space for finding Eco-feeling(mind), as far as the relation to life in there. No life without ecological relation, so firstly we need to be rethink Eco-feeling could be enough trained in daily life, our EE trends that have distinguished between indoor and outdoor should be rearranged, going there is just for when we unavoidably need to go for outdoor experience. So I focus on two special causes bringing out these biases, 1st Environmental management-thinking, which has been passed over this trend under the name of training environmentally responsible citizen through Awareness, Knowledge, Skill and Attitudes. 2nd important cause is cultural metaphors, which means our thinking is fixed into some patterns, losing cultural thinking diversity, although eco-culture in our daily life has been figured our daily life out as ecological phenomenon hermeneutically. To illustrate this problematic trends, this paper will introduce theories of Bateson G. and Bowers C.A. mainly, who insist fixed pattern-thinking bound for environmental management could be obstacles to make students see and have Ecological intelligence in their mind throughout daily life. This paper will focus on how to feel Eco-mind in our daily life through cultural experience. Representative way for this is to research on rice paddy eco-system and rice culture.

• 디지털융복합연구
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• 제13권12호
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• pp.303-311
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• 2015

본 연구의 목적은 환경문제 인식, 친환경 태도, 친환경 간호수행의 상관관계를 알고자 하는데 있다. 191명의 병원 간호사가 2012년 10월부터 11월까지 자기기입식 설문을 작성하였으며, 자료 분석은 t-test, one way ANOVA, Pearson 상관관계, multiple regression analysis를 사용하였다. 설문은 환경문제인식, 친환경태도, 친환경보건 관리로 구성되었고, 환경문제인식 (r=.46, p<.001), 친환경태도 (r=.36, p<.001), 친환경 보건관리 사이에 양의 상관관계가 있었다. 변수들에 대한 설명력은 35.0%였다. 본 연구를 통해 국내 병원 간호사의 환경문제와 친환경태도에 대한 인식도를 향상시킬 필요가 있음을 증명하였다. 본 연구 결과를 통해 병원 간호사의 친환경 간호수행을 향상시키기 위한 병원 내 친환경 프로그램 개발 연구를 제언한다.