• Corrosion Science and Technology
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• 제21권4호
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• pp.273-281
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• 2022

The effect of addition of Cu on the localized corrosion performance of aged duplex stainless steel in chloride media has yet to be explained in a consistent manner, and there is some controversy in the literature regarding the composition of stainless steel and the experimental conditions (pH, temperature, chloride concentration, etc.) used. In this work, the effect of the addition of Cu on the microstructure, hardness, and corrosion resistance of duplex stainless steel in an acidic chloride or high concentration sulfuric acid solutions was investigated for annealed and aged alloys. The Cu addition of annealed duplex stainless steel strengthened the alloy and reduced the ferrite contents of the alloy, and it also increased the polarization behavior in chloride or sulfuric solutions, except for the case of a high potential in acidic chloride solution. However, the Cu addition of aged duplex stainless steel reduced the formation of harmful phases such as sigma and kai and increased the polarization behavior in acidic chloride or sulfuric solutions up to 0.8 wt% of the Cu content, after which it slightly decreased at 0.8 wt% Cu or more.

• Transactions on Electrical and Electronic Materials
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• 제11권4호
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• pp.149-154
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• 2010

With soaring public concerns of environmental issues, many researchers have started to carry out research on various related topics in many areas of science and engineering. This paper describes a brief outline of typical recent research results obtained in the author's laboratory on electrical and optical properties of dielectric materials, done aiming at contributing to green power technology.

• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.273-276
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• 2014

• 혜화의학회지
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• 제17권1호
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• pp.11-19
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• 2008

Objective : We designed this study to analyse the anti-cancer effects of materials of green vegetable juice by using the natural standard methodology and apply the results to new studying and evaluating methods. Methods : We investigated the main stream of complementary and alternative medicine (CAM), the methodology of natural standard, guideline in CAM, and concrete 15 green vegetable juice in cancer therapy. Results : There are 15 graded materials of green vegetable juice that associated with cancer in natural standard contents. Most of them get grade C, unclear or conflicting scientific evidence. Conclusion : Natural Standard aims to provide high-quality, reliable information about CAM therapies to clinicians, patients, and healthcare institutions. We have to acquire more reliable evidence in future.

• 한국가정과교육학회지
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• 제23권1호
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• pp.19-36
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• 2011

이 연구의 목적은 한국과 일본의 고등학교 가정 교과서에 실린 녹색생활교육 학습자료 내용을 분석하는데 있다. 2007 개정 교육과정에 근거한 고등학교 l학년 기술 가정교과서 6권과 일본의 고등학교 교과서 4권을 포함하여 총 10권을 분석하였다. 한국과 일본의 고등학교 가정교과서 분석 결과, 두 나라 모두 녹색생활교육 자료가 가정경영/소비생활 영역에 가장 많고, 학습 자료 유형은 표/그림/사진 자료가 가장 많았다. 한국 가정교과서에는 녹색생활교육 관련 내용과 실천적 활동 학습자료가 전 영역에 거쳐 다양한 형태로 제시되어 있으나 출판사별 차이를 감안할 때 현장교사는 학교에서 채택한 교과서 이외에 다양한 교과서를 참조하는 것이 필요하다. 차기 가정과교육과정에는 선행연구에서 밝힌 녹색생활 내용요소들을 고루 포함하고, 중학교의 학습 자료 내용과 차별하여 심화된 실천적 행동을 유도할 수 있는 내용으로 구성하여야 할 것이다.

• Journal of Construction Engineering and Project Management
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• 제8권3호
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• pp.1-23
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• 2018

Since the protection the of human being from natural disaster and atmospheric factors have become an essential requirement, some attempts have been taken place to provide shelter and create a safe environment to a more comfortable life with welfare. For this purpose, using existing resources in nature and exploiting them in a different manner have been taken into account. Initially, the performed exploitations for construction had the least damage to the environment, but over time and as a result of population growth, aggressive exploitation of nature has led to destroying effects on the environment and resulted in consequences such as pollution and environmental destruction. Thus, the construction industry has been identified as the top pollutant factors of the environment. Among various construction factors, the building materials used in this industry are considered as the most important effective factors on the environment, as they have direct influences on the environment from the beginning of construction of the final steps. This research focuses on the review of the most of the existing green materials definitions and various approaches towards using eco-efficient construction materials. It presents and discusses possible ways of reducing the destructive effects on the environment by selecting and using green materials, review current literature and highlight the necessity of applying such materials in future constructions in all communities. This paper provides a base for this purpose that sustainable development communities and environment is realized by elimination of environmental pollution and approaching the criteria of green building by using sustainable materials.

• Transactions on Electrical and Electronic Materials
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• 제8권3호
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• pp.121-124
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• 2007

The $Zn_2SiO_4:Mn$ phosphors were prepared using polymer matrix technique in order to improve the performance of green emitting phosphors for plasma display panel(PDP). $Zn_2SiO_4:Mn$ phosphor exhibits a strong green emission around 520-530 nm. The emission intensity and particle size of powders were controlled by sintering temperature and raw material composition. The zinc silicate $Zn_2SiO_4:Mn$ single phase were obtained at lower temperature than prepared by solid-state reaction method. PL luminance of $Zn_2SiO_4:Mn$ phosphor was similar to the commercial material.

• Journal of Magnetics
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• 제15권1호
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• pp.12-16
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• 2010

Combined study of in-situ stress measurements and atomic force microscopy (AFM) revealed drastic stress relaxation in the CoCrPt and PS(styrene)-PVP(vinyl pyridine) polymer hybrid structure that was closely related to the growth structure of the film. We have observed not only no large initial growth stress at the initial stages of film growth but also twice smaller stress in magnitude with opposite sign in the CoCrPt/PS-PVP/Si sample. The microstructural studies using AFM at the various film growth stages revealed that the film growth structure plays an important role in the stress relaxation mechanism of CoCrPt films on a corrugated polymer surface.

• 한국군사과학기술학회지
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• 제15권4호
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• pp.475-491
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• 2012

Green Chemistry emerged at the end of 20th century, which aims the development of the technologies for the sustainable society at the molecular level. Most products we consume in everyday life are produced through chemical processes, and we often oversee the fact that huge amount of solvents are used and disposed. At the present time most solvents used in laboratories as well as industries are volatile organic compounds(VOC), which gives health and environmental problems. Therefore scientists are seeking new materials which have equivalent properties of VOCs as solvent, and at the same time gives no health and environmental problems. In this brief review, the author describes the present status of research and development activities of green solvent materials throughout research societies worldwide. At present the most attractive green solvent candidates are water, glycerol, supercritical carbon dioxide and ionic liquids. In order to give the pictures of these materials, the author tried to introduce the overall aspects of green solvents in various chemical reaction as well as catalytic roles.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2014년도 임시총회 및 하계학술연구발표회
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• pp.153-154
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• 2014