• 제목/요약/키워드: System Property

검색결과 4,647건 처리시간 0.033초

The effect of neutron irradiation on hydride reorientation and mechanical property degradation of zirconium alloy cladding

  • Jang, Ki-Nam;Kim, Kyu-Tae
    • Nuclear Engineering and Technology
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    • 제49권7호
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    • pp.1472-1482
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    • 2017
  • Zirconium alloy cladding tube specimens were irradiated at $380^{\circ}C$ up to a fast neutron fluence of $7.5{\times}10^{24}n/m^2$ in a research reactor to investigate the effect of neutron irradiation on hydride reorientation and mechanical property degradation. Cool-down tests from $400^{\circ}C$ to $200^{\circ}C$ under 150 MPa tensile hoop stress were performed. These tests indicate that the irradiated specimens generated a smaller radial hydride fraction than did the unirradiated specimens and that higher hydrogen content generated a smaller radial hydride fraction. The irradiated specimens of 500 ppm-H showed smaller ultimate tensile strength and plastic strain than those characteristics of the 250 ppm-H specimens. This mechanical property degradation caused by neutron irradiation can be explained by tensile hoop stress-induced microcrack formation on the hydrides in the irradiation-damaged matrix and subsequent microcrack propagation along the hydrides and/or through the matrix.

Lined Pipe의 응력해석을 위한 등가 물성치 계산 (Equivalent Mechanical Property for Stress Analysis on Lined Pipe)

  • 최재승;정진한
    • 대한기계학회논문집A
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    • 제26권3호
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    • pp.445-451
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    • 2002
  • The refractory-lined pipe is used to protect the system from high-temperature of the internal flow. The property of the refractory has an effect upon the stress analysis for fluid catalytic cracking(FCC) unit piping design. The equivalent elastic modulus and density considering steel and refractory must be applied in the stress analysis of the system. In the research, the theoretical method to obtain the value of the equivalent property is introduced and then the parametric analysis is carried out to understand the characteristic of the material properties, and the stress analysis is performed with reactor, the part of FCC unit.

하이브리드 용접에 의한 세립강 용접부의 기계적 성질에 관한 연구 (Mechanical Property of Ultra Fine Grained Steel Weld by Hybrid Welding)

  • 동현우;안용식
    • 동력기계공학회지
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    • 제15권1호
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    • pp.45-50
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    • 2011
  • The effect of Mn and Ti contents in filler wire on the microstructure and mechanical property of weld metal has been investigated after hybrid welding with ultra fine grained (UFG) steel. The microstructure and distribution of alloy compositions at the top region of weld zone were quite different with those at the bottom region after hybrid welding. The bottom region of weld zone contained higher Mn and Ti contents, and consequently the hardness of bottom region was higher than that of top region. With the increase of Mn and Ti contents in filler wire, the volume percent of acicular ferrite in weld metal decreased, and the weld zone showed higher hardness and better impact property.

MLRS 발사관 소재 및 구조특성 연구 (Research on the properties of MLRS launch tube material and structure)

  • 채경민;손현일;서혁;허윤
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2005년도 제25회 추계학술대회논문집
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    • pp.154-157
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    • 2005
  • MLRS는 2004년부터 국내에서 양산화된 무기 체계로 그 부품인 복합재 발사관은 미국 GD사(社)의 설비 및 공정조건을 참고하여 국내에서 독자적으로 개발/생산되고 있다. 본 연구는 지금까지 공정 분야에 치중되었던 제품 연구의 폭을 소재 및 구조특성 분야로 넓혀 발사관의 성능 개량 또는 이후에 개발되는 무기체계에 응용 가능한 기반을 수립하는데 목적이 있다. 연구 과정은 소재 특성, 공정 조건, 구조적 특성에 대한 연구 순서로 진행하였다.

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역학적 정수를 이용한 다짐관리기법에 관한 연구 (Soil Compaction Management Methodology using Mechanical Property)

  • 강규진;최준성;김종민;노한성;김태수
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2002년도 봄 학술발표회 논문집
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    • pp.127-132
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    • 2002
  • While the pavement design is based on mechanical property such dynamic elastic modulus, the quality of highway subgrade during construction is controled by the optimum moisture content(OMC) and maximum dry density(${\gamma}$$\_$dmax/). However, since the quality control based on the OMC and maximum dry density does not consider the mechanical characteristics, there is a conceptional gap between design and PMS(pavement management system). Therefore, it is necessary to develope a new qualify control system using mechanical property for highway construction in more rational way. To achieve this goal, it is planned to perform various laboratory tests to collect mechanical properties of subgrade soil samples from several highway construction sites and to propose the relationship between dry unit weight (or OMC) and mechanical parameters. In this paper, the experimental data so far obtained are presented and analyzed. In addition, further research plan is presented and discussed.

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DCT영역에서의 국부 Contrast 조절 기법 (Method for Local Contrast Control in DCT Domain)

  • ;;김원하;김선국
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 2013년도 추계학술대회
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    • pp.8-11
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    • 2013
  • We implement the foveation and frequency sensitivity feature of human visual system in discrete cosine transform (DCT) domain. Resolution of human visual perception decays as distance from the eye-focused point, known as foveation property, and the middle frequency components give most pleasant image quality to human than the low and high frequency components, which is the frequency sensitivity property of human visual system. For satisfying the foveation property, we enhanced the local contrast at the focused regions and smoothed local contrast at the non-focused regions in the DCT domain without bringing the blocking and ringing artifacts. Moreover, the energies at each DCT frequency components is modified with various degree to fulfill the frequency sensitivity property. The proposed method is verified by the subjective and objective evaluations that it can the improve the human perceptual visual quality.

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국가직무능력표준(NCS) 기반 지식재산교육을 위한 교육요구 분석 (Educational Needs Analysis on NCS-based Intellectual Property Education)

  • 박기문
    • 대한공업교육학회지
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    • 제43권1호
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    • pp.134-157
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    • 2018
  • 이 연구는 지식재산 분야의 실무형 인재를 양성하는 NCS 기반 교육체계를 도입 운영하기 위해서 지식재산교육체제에 대한 만족도와 문제점, 지식재산 NCS(지식재산관리, 지식재산정보조사분석, 지식재산평가 거래)에 대한 교육요구를 조사 분석하였다. 이에 대한 연구의 결론은 다음과 같다. 첫째, 지식재산교육체제에 대한 만족도는 교육내용(M=3.86), 강사(M=3.79), 강의방법 및 환경(M=3.66), 교육평가(M=3.50) 순으로 높게 나타났다. 개선해야 할 문제점은 교육내용에 대해 내용 체계성 미흡과 산업현장 요구를 미반영하여 현업적용도가 낮은 것, 강사는 교육역량과 수강생과의 상호작용이 미흡하며 실무 능력보다 이론 지식을 강조하는 것, 강의 방법은 교육매체 활용성이 낮고 흥미 및 동기부여 방법이 미흡한 것, 평가방법은 이론 지식과 실무 능력의 목표 달성이 부족, 이론 위주로 평가를 실시한다는 것 등이 높게 나타나 이에 대한 개선방안이 마련되어야 한다. 둘째, 지식재산 NCS에 대한 교육요구도는 지식재산평가 거래(요구도 평균=4.33), 지식재산관리(요구도 평균=3.68), 지식재산정보조사분석(요구도 평균=2.99)순으로 높게 나타났으며, 이를 NCS 기반 교육과정을 개편하거나 신규 개발하는 데 반영할 수 있도록 검토해야 한다. 결론적으로 기존 지식재산교육은 보통이상의 만족도를 보였지만 산업현장의 활용성을 높이기 위해 이론보다 실무 능력을 높이는 직무 중심의 교육을 요구하고 있는 것으로 나타났다. 이를 위해서는 산업현장의 요구를 반영한 지식재산 NCS를 도입하여 NCS 기반 교육과정으로 개편하거나 신규 개발이 이루어져야 한다. 또한 공급자가 아닌 수요자 중심의 교수학습방법, 이론 지식이 아닌 수행 및 과정 중심의 평가방법 등의 변화된 교육 패러다임으로 지식재산교육이 개선되어야 한다.

지적재산권분쟁의 중재적격에 관한 연구 -한국과 중국을 중심으로- (A Study on Arbitration Qualification of Intellectual Property Right Dispute - Focus on Korea and China -)

  • 최송자
    • 한국중재학회지:중재연구
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    • 제21권2호
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    • pp.27-46
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    • 2011
  • In the intellectual based society of the 21th century, intellectual property of nation and enterprise management has been the key element of nation's competitiveness and development. Therefore in countries like Korea, China, and many other countries, intellectual property of advancement strategy are being constructed and intellectual properties are protected at national level. Top priority task of protecting the intellectual property is to efficiently resolute intellectual property right disputes. Considering the nature of intellectual property right and arbitrage system, arbitration to solve intellectual property disputes is realistically the best method. However, not all cases of them are qualified. In order to relieve the intellectual property disputes through arbitration, qualification must be obtained. During the process, generally and globally, intellectual property right dispute is evaluated by three parts, intellectual property right contract dispute, intellectual property right violation dispute, and intellectual property right validity dispute. Based on UN's "Convention on the Recognition and Enforcement of Foreign Arbitral Awards Agreement" in 1958, June 10th, in New York, both arbitrage organization and judgment can be approved in both Korea and China countries. However, as of today, there is a big gap of arbitration qualification between two countries, which can be troublesome if intellectual property right disputes arise. For instance, in Korea, intellectual property right contract disputes and intellectual property right violation disputes are both generally accepted as arbitration qualification. However for intellectual property right validity dispute, arbitration qualification is only accepted for non-registered intellectual property as in copyright entity. It does not apply to other registered intellectual property right as in patents. In China, arbitration qualification is accepted for intellectual property right contract dispute, and also accepted for intellectual property right violation dispute to copyrights but restricted to others. As for intellectual property right validity dispute, arbitration qualification is completely denied. Therefore, when there is an intellectual property right dispute between Korea and China, the biggest problem is whether China will accept arbitrage judgments made in Korea. Theoretically, arbitrage judgement made in Korea should be also accepted in China's court. However, considering the criticism of China's passive nature of arbitration qualification for its own local intellectual property right disputes, it's very unlikely they'll actively accept arbitrary judgment made in foreign countries. Korea and China must have a more open minded approach for intellectual property disputes and arbitration qualification. Base on WTO's Intellectual Property Right Agreement, it's being defined as private right. Therefore, sovereign principle should be the basic principle of solving intellectual property right disputes. Currently, arbitration qualification is expanding internationally. So both Korea and China must also follow the trend expand the arbitration qualification with a more open minded and forward looking approach, for the good of intellectual property disputes.

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지식재산권분쟁(知識財産權紛爭)의 재판외(裁判外) 해결제도(解決制度)에 관한 연구(硏究) - 조정(調停)과 중재(仲裁)를 중심(中心)으로 - (A Study of Resolution of the Intellectual Property Dispute through Mediation and Arbitration)

  • 김용길
    • 한국중재학회지:중재연구
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    • 제19권1호
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    • pp.67-98
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    • 2009
  • Recently there are many cases on the intellectual property dispute. Among them some cases are solved through mediation and arbitration. Mediation and arbitration hold some advantage over court proceeding for intellectual property dispute. However the traditional litigation system has material limitation to settle down international intellectual property dispute. Without arbitration, litigation in court would be the only choice in case of no consensual settlement between the disputing parties. However, once being aware of the usefulness of the arbitration, people in international business widely realize that arbitration is generally preferred to litigation. Mediation is a method of settling dispute outside of court setting and many mediation committee are established since 1986 in Korea. Arbitrability has been a crucial issue in the intellectual property dispute. In most developed countries including the U.S.A. and Switzerland, arbitrability in the intellectual property dispute has been changed in recent years by law. Now in resolving the dispute with international intellectual property is needed for legal research, experience, working practices and knowledge of the intellectual property industry and so on.

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재산형성에 대한 주부의 기여도에 관한 연구 (- A Study on Wife's Contribution to Matrimonial Property -)

  • 문숙재
    • 대한가정학회지
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    • 제31권1호
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    • pp.13-24
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    • 1993
  • The reformed family law was enforced from Jan.1,1991 and the claim to division of matrimonial property in case of divorce, a newly enacted right in the law, is expected to increase the economic position of married women. By this system, married woman can claim her share in the matrimonial property in case of divorce if she verifies her contribution to it. But actually, household work of housewives has not been evaluated properly as compared with their husbands' work in deciding of property division rate, because there is no economic base about the value of household work. So, this study verified wives' role of contribution to matrimonial property and compared their work hours with their husbands. As the result, following suggestions can be presented. 1. The contribution rates of husband and wife to the matrimonial property have to be acknowledged equally and, in case of employed wife, her rate has to be evaluated higher than her husband. 2. Because the property division is not a solatium but a transfer of wife's share, responsibility which marriage has dissolved should not be taken more to women than men. 3. Decision of division rate has to be made regardless the amount fo property unless there are special reasons. 4. The donation tax and inheritance tax should not be imposed on matrimonoal property which was returned to wife from her husband.

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