• 제목/요약/키워드: long-term property

검색결과 346건 처리시간 0.028초

초기재령 콘크리트의 세공구조 형성 및 발영특성에 관한 미시역학적 모델 (Micromechanics based Models for Pore-Sructure Formation and Hydration Heat in Early-Age Concrete)

  • 조호진;박상순;송하원;변근주
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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    • pp.123-128
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    • 1999
  • Recently, as a performance based design concept is introduced, assurance of expected performances on serviceability and safety in the whole span of life is exactly requested. So, quantitative assessments about durability related properties of concrete in early-age long term are come to necessary, Especially in early age, deterioration which affects long-term durability performance can be occurred by hydration heat and shrinkage, so development of reasonable hydration heat model which can simulate early age behavior is necessary. The micor-pore structure formation property also affects shrinkage behavior in early age and carbonations and chloride ion penetration characteristic in long term, So, for the quantitative assessment on durability performance of concrete, modelings of early age concrete based on hydration process and micor-pore structure formation characteristics are important. In this paper, a micromechanics based hydration heat evolution model is adopted and a quantitative model which can simulate micro-pore structure development is also verified with experimental results. The models can be used effectively to simulate the early-age behavior of concrete composed of different mix proportions.

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감소인자에 의한 지오그리드의 내구성 평가 (Durability Assessment of Geogrids by Reduction Factors)

  • 전한용;허대영
    • 한국지반신소재학회논문집
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    • 제3권2호
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    • pp.31-38
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    • 2004
  • 2종류 지오그리드의 장기안정성의 검토되었다. 멤브레인 연신형 지오그리드는 지수함수형 인장거동을, 섬유형 지오그리드는 파단점에 가까울수록 빠른 인장특성 증가를 나타내었다. 섬유형 지오그리드의 경우 가속 크리프 시험을 실시하였지만 멤브레인 연신형 지오그리드의 경우에는 열적특성 때문에 가속 크리프 시험을 실시할 수 없었다. 멤브레인 연신형 지오그리드의 크리프 변형률은 인장시험에 의한 극한변형률보다 훨씬 큰 값을 나타내었으며, 섬유형 지오그리드의 크리프 변형에 의한 감소인자는 멤브레인 연신형 지오그리드에 비해 작은 값을 나타내었다.

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초고령화 사회를 대비한 노인장기요양보험제도에 관한 연구 (A Study on the Long-Term Care Insurance System prepare for the Super-Aged Society)

  • 김민주;황준용
    • 한국산학기술학회논문지
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    • 제20권10호
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    • pp.395-405
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    • 2019
  • 우리나라는 경제발전, 출산율 저하, 보건의료의 발달로 65세 이상 노인 인구의 비율이 2018년 14% 고령사회, 2026년 20% 초고령사회로 예상되어 빠른 인구구조의 변화를 겪고 있다. 고령화에 따라 치매, 중풍 등 일상생활이 어려운 노인들의 수는 날로 증가하고, 핵가족화, 여성의 사회참여 증가 등으로 장기요양이 필요한 노인들을 가정에서 돌보는 것이 어려워졌다. 이에 정부는 이러한 사회적 구조 및 노인문제를 해결하기 위해 장기요양대상 노인의 삶의 질 향상과 가족부양 부담의 완화 등을 목적으로 노인장기요양보험법을 제정하여 시행하고 있다. 따라서 본 연구는 시설의 민영화와 난립으로 서비스의 공적 책임과 시설의 질 제고에 대한 요청이 확산되고 있는 부분을 살펴보고자 한다. 이 밖에도 저임금 요양인력의 양산, 재원조달 방식에 관한 문제 등의 대비가 다각도로 부족한 부분을 도출하고자 하였다. 본 연구를 통하여 노인장기요양보험제도가 초고령화 사회를 대비하여 장기 지속적으로 유지 발전하기 위해서는 법 제도적 측면의 개선방안의 모색과 더불어 노인복지서비스가 신체적 건강 뿐만 아니라 노후 생활의 안정을 위한 정신적 심리적 조치를 강구하는 방안을 검토하고자 한다.

Long-Term Wildfire Reconstruction: In Need of Focused and Dedicated Pre-Planning Efforts

  • Harris, William S.;Choi, Jin Ouk;Lim, Jaewon;Lee, Yong-Cheol
    • 국제학술발표논문집
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    • The 9th International Conference on Construction Engineering and Project Management
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    • pp.923-928
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    • 2022
  • Wildfire disasters in the United States impact lives and livelihoods by destroying private homes, businesses, community facilities, and infrastructure. Disaster victims suffer from damaged houses, inadequate shelters, inoperable civil infrastructure, and homelessness coupled with long-term recovery and reconstruction processes. Cities and their neighboring communities require an enormous commitment for a full recovery for as long as disaster recovery processes last. State, county, and municipal governments inherently have the responsibility to establish and provide governance and public services for the benefit and well being of community members. Municipal governments' comprehensive and emergency response plans are the artifacts of planning efforts that guide accomplishing those duties. Typically these plans include preparation and response to natural disasters, including wildfires. The standard wildfire planning includes and outlines (1) a wildfire hazard assessment, (2) response approaches to prevent human injury and minimize damage to physical property, and (3) near- and long-term recovery and reconstruction efforts. There is often a high level of detail in the assessment section, but the level of detail and specificity significantly lessons to general approaches in the long-term recovery subsection. This paper aims to document the extent of wildfire preparedness at the county level in general, focusing on the long-term recovery subsections of municipal plans. Based on the identified challenges, the researchers provide recommendations for better longer-term recovery and reconstruction opportunities: 1) building permit requirements, 2) exploration of the use of modular construction, 3) address through relief from legislative requirements, and 4) early, simple, funding, and the aid application process.

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산림화재로부터 문화재를 보호하는 소방시설에 관한 연구 -미분무수설비를 중심으로- (A Study of the Suppression System based on the Fire Protection System the Korea Cultural Property due to the Forest Fire -About Water Mist System-)

  • 공하성
    • 한국화재소방학회논문지
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    • 제21권4호
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    • pp.44-51
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    • 2007
  • 우리나라 대부분의 문화재인 사찰은 목조 건축물로 가연성이 높고 도심과 떨어진 산속에 있어 화재 진화에도 소방력의 접근성이 용이하지 않아 초기 진화가 어렵다. 또한 장기 지속적인 화원으로부터 문화재 보호를 위한 수원의 확보 및 자체 소방시설도 한계가 있다. 따라서 본 연구에서는 산불로 인한 화재의 초기 진화 및 장기 지속적인 화원으로부터 문화재를 보호하고자 기존의 수계설비보다 피해를 최소화 할 수 있는 미분무수 설비를 적용하여 우리나라 문화재의 지형적 위치를 고려한 가연물의 발화에너지를 제거하는 방식의 소방시설과 차단벽을 활용한 방식의 소방시설을 제안하였다.

Development of New Detachable Connection for Glass Fiber Reinforced Polymer Considering of Short and Long-Term Behavior

  • Park, Don-U;Hwang, Kyung-Ju;Knippers, Jan
    • 한국공간구조학회논문집
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    • 제7권3호
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    • pp.141-151
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    • 2007
  • The appearance of many Glass Fiber Reinforced Plastic (GFRP) constructions look like ordinary steel construction, because GFRP has been imitated by the same way with the traditional steel's cross section as well as connection system. In terms of detachable connection, there was not enough appropriate option of GFRP connection, such as a traditional bolt connection for steel and wood structures. Most of all, from material characteristic of GFRP related to the deficient ductility, the shearstress principle of GFRP s not proper for the material property, which causes ineffective and not economic application of material. With this research problem, the innovative and detachable onnection system, which is more considered with appropriate material characteristic for FRP, is developed. Not only short time but also long time research with various connection variations is carried out.

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Inorganic Salt Doped Soluble Polyimide Type Alignment Layer for Improving Panel Reliability and DC Image Sticking Properties

  • Lee, Tae-Rim;Roh, Seung-Kwang;Lim, Young-Nam;Kim, Kyeong-Jin;Shin, Hyun-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.672-676
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    • 2009
  • Polymide is widely used alignment material of recent commercial LCD panel structure. Generally, polyimide alignment material is classified soluble polyimide type and polyamic acid type with their main bond structure of solution state. specially, compared to polyamic acid alignment layer, soluble polyimide type alignment layer have excellent reliability during long term LCD driving cause of their high imidazation ratio(%), high voltage holding ratio(%) and low ion density. The other side, this type alignment materials has significant DC image stickicng side effect for using in-plane switching mode lcd structure cause of their slow DC discharging property. we applied inorganic salt to usual soluble polyimide type alignment layer and found out this technique had good DC image sticking property without any loss of reliability property in inplane switching LCD cell structure. This approach leads excellent DC image sticking property with maintaining high reliability property this approach confirmed improves an image sticking and a reliability simultaneously from the horizontality aligned LCD mode whose relatively bad image sticking property.

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The role of Patent on Foreign Direct Investment: Evidence in Vietnam

  • PHAM, Nga Thi;PHAM, Huong Thi Thu
    • 유통과학연구
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    • 제18권6호
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    • pp.77-82
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    • 2020
  • Purpose: In the period of international integration, how is the implementation of intellectual property regulation in developing countries? Do intellectual property rights help attract more Foreign direct investment (FDI)? This study aims to show the effect of intellectual property rights, reflect in the number of patent registered (Patent distribution into two components: Patent_residents and Patent_non-residents) on FDI attraction in Vietnam. Research design, data and methodology: Using Autoregressive distributed lag (ARDL) model for the data collected from 1990 to 2018 with EViews version 9 software. Conclusions: The results indicate that the number of patent protection has a positive effect on FDI in both short term and long term. In particular, only patent registration of foreign individuals and organizations has a significant positive effect on attracting FDI, while that of Vietnamese patents is not statistically significant. From the results of this study, we provide some recommendations to help attract FDI based on raising awareness of intellectual property rights: Increase international cooperation for innovation to learn and encourage patent; Improve the capac ity of inventing as well as the ability to register patents of Vietnamese people; Government agencies are tasked to support a nd review registration procedures; Encouraging patent registration based on the patent.

Japanese Financing Policies for Innovation Since the 1990s

  • Intarakumnerd, Patarapong;Charumilin, Pattarawan
    • STI Policy Review
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    • 제4권2호
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    • pp.55-73
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    • 2013
  • Since the 1990s, the Japanese government has made considerable attempts at stimulating innovation with an aim to pull the country out of a possibly permanent economic decline. Several laws and policy initiatives were introduced to encourage better interaction between universities (and research institutions) and industry. The results of these efforts have been mixed. While the number of university-industry joint and commissioned research has increased, revenues from the licensing of university-owned patents have fluctuated year by year. Although the number of startups and spin-offs from universities rose, their long-term survival and contribution to the economy remain uncertain. The Japanese experience features both strengths and weaknesses. Strengths include the long-term commitment of policy makers, the ability to set specific targets, and the active engagement of several key economic ministries. Nevertheless, the effectiveness of these policy initiatives was hampered by limitations within the policies concerning the roles of universities and their mode of interaction with industry based on intellectual property rights, the inadequacy of demand-side innovation policies, the fragmentation of bureaucracy, and a lack of a credible evaluation system.

스타일 형성에 관한 연구 - Iris Van Herpen의 스타일을 중심으로 - (A Study on the Formation of a Style - Focusing on the Style of Iris Van Herpen -)

  • 김영선
    • 패션비즈니스
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    • 제16권2호
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    • pp.124-137
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    • 2012
  • This study aims to identify the meaning and formation cause of a style, and the essential elements of style formation, through psychobiological research as well as an analysis of the designs of Iris Van Herpen, a fashion designer, who in just 6 years has developed into a world-renowned new designer. As a result, it has been found that the psychobiological causes to form a style stem from the action of 'long-term memory', which is consolidated by 'selective attention', 'perceptional subjectivity', the principle of the 'neuron's connection specificity and invariance', and the principle of a 'neuronal signal's unilateral flow'. With such action, Herpen could develop her own original composition techniques. The formative shapes created by such composition techniques are characterized by enumeration, superposition, and hanging. The study has also found that the essential elements for a designer to be able to form his/her own style include 'aesthetic originality' in which the designer views the property of a thing from his/her inherent perspective, and finds the uniqueness from the thing that only he/she can express, 'technical differences' that are creative and original, and 'formative specificity' that is summarized into one property through an impressive shape.