• Structural Engineering and Mechanics
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• 제25권2호
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• pp.131-146
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• 2007

This paper presents the results of a study to show how the development of a crack alters the structural behavior of I-shaped steel beams and how this can be used to evaluate nondestructive evaluation techniques. The approach is based on changes in the dynamic behavior. An approximate finite element model for a cracked beam with I-shaped cross-section is developed based on a simplified fracture model. The model is then used to review different damage cases. Damage detection techniques are studied to determine their ability to identify the existence of the crack and to identify its location. The techniques studied are the coordinate modal assurance criterion, the modal flexibility, and the state and the slope arrays.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 추계 학술발표회 논문집
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• pp.98-105
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• 2002

The effects of the base-isolation system and elastic soil foundation on the behavior of a liquid storage tank are studied. To evaluate the seismic response of liquid storage tank accurately, the coupled dynamic system considering base isolation and soil interaction problem is formulated in time domain. Results show that the base isolation system reduces effectively the radial displacements, base shears, overturning moments, axial resultant stresses and the hydrodynamic pressure by providing flexibility and energy dissipation capability. Base Isolation may, however, increase the relative liquid sloshing amplitude due to the effect of liquid-structure interaction and cause excessive large relative displacements between structure and foundation. In addition to base-isolator, the dynamic behavior of liquid storage tank is related to the flexibility of base foundation, so the analysis of soil-structure interaction s achieved.

• 한국자기공명학회:학술대회논문집
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• 한국자기공명학회 2001년도 제18회 학술발표회
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• pp.32-32
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• 2001

• 복식문화연구
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• 제21권2호
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• pp.220-233
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• 2013

This study examined regarding the moderating effect of length of relationship in the relationship among the antecedent variables (i.e., specific investment, opportunistic behavior, communication, uncertainty, interdependence, power imbalance, shared value, and flexibility) of trust and commitment, trust and commitment and firm performance and relationship satisfaction. A total of 128 apparel manufacturers participated in this study. Flexibility exerted the most positive effect on trust in short-term relationship, followed by specific investment. And opportunistic behavior was found to exert negative effect on trust. Commitment was found to be most negatively affected by power imbalance, followed by interdependence. Trust was shown to be significantly affected by communication, shared value and flexibility in short-term relationship. In the case of long-term relationship, commitment was shown to be significantly affected by uncertainty, interdependence, power imbalance and flexibility. Firm performance was positively affected by both trust and commitment. As for the effect of trust and commitment on relationship satisfaction, relationship satisfaction was also affected by both trust and commitment. In case the length of relationship, firm performance was affected by both trust and commitment. As for the effect of trust and commitment on relationship satisfaction, relationship satisfaction was also affected by both trust and commitment. The result of this research provides valuable data for making a concrete suggestion regarding the strategy for improving trust and commitment for the sake of the desirable relationship between apparel manufacturers and contractors.

• 대한토목학회논문집
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• 제8권2호
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• pp.197-204
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• 1988

본(本) 연구(硏究)는 앵커로 지지(支持)된 유연(柔軟)한 널말뚝에 대한 실험연구(實驗硏究)로서, 굴착(掘鑿) 깊이에 따른 거동(擧動)을 확인한 것이다. 유연성(柔軟性)으로 인한 벽(壁)의 변위(變位)와 앵커 하중(荷重)에 따라 휨모멘트가 감소(減少)함을 알 수 있었고, Rowe의 모멘트 감소곡선(減少曲線)이 합리적(合理的)임을 확인하였다. 앵커로 지지(支持)된 널말뚝의 변위(變位)와 지반침하(地盤沈下)는 앵커 하중(荷重)과 벽(壁)의 유연성(柔軟性)의 선택에 의해서 감소(減少)시킬 수 있을 것으로 보인다.

• 정보저장시스템학회:학술대회논문집
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• 정보저장시스템학회 2005년도 추계학술대회 논문집
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• pp.210-214
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• 2005

The purpose of this paper is to study the effects of the flexibility of HDD base plates on spindle vibration via theoretical predictions and experimental measurements. The flexibility of the base plate can significantly affect HDD spindle vibration. This is the most prominent feature in 2.5 inch HDD. Nevertheless, theoretical analysis of the spindle vibration often neglects the flexibility of the non-rotating part including spindle, base plate, and top cover. Our theoretical model developed in University of Washington can include the flexibilities of spindle and base plate. As a result, our theoretical prediction generally agrees well with our experimental measurements in vibration analysis. Moreover, Because of its small form factor, industrial practice is to use flanged disks instead of regular disks in vibration testing of prototypes. Our experimental measurements indicate that flanged disks and regular disks have very different behavior when the frequency is above 1 KHz.

• 정보저장시스템학회논문집
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• 제2권2호
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• pp.111-116
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• 2006

The purpose of this paper is to study the effects of the flexibility of HDD base plates on spindle vibration via theoretical predictions and experimental measurements. The flexibility of the base plate can significantly affect HDD spindle vibration. This is the most prominent feature in 2.5 inch HDD. Nevertheless, theoretical analysis of the spindle vibration often neglects the flexibility of the non-rotating part including spindle, base plate, and top cover. Our theoretical model developed in University of Washington can include the flexibilities of spindle and base plate. As a result, our theoretical prediction generally agrees well with our experimental measurements in vibration analysis. Moreover, because of its small form factor, industrial practice is to use flanged disks instead of regular disks in vibration testing of prototypes. Our experimental measurements indicate that flanged disks and regular disks have very different behavior when the frequency is above 1 KHz.

• 한국지반환경공학회 논문집
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• 제24권11호
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• pp.5-10
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• 2023

지하수 제어가 필요한 분야에서 다방면으로 활용되는 Slag-CB는 CB의 일종으로 CB에 혼합되는 시멘트의 일부를 GGBS 로 치환하여 사용하는 차수벽의 일종이다. 일반적으로 Slag-CB는 GGBS의 치환율이 증가함에 따라 압축강도, 차수성, 내구성 및 내화학성 등이 장기적으로 향상되는 장점이 있으나, 벽체의 유연성 및 변형에 대한 저항성이 저하되며 파괴 시 취성을 보이는 문제가 있다. 이러한 문제를 해결하기 위해 일부 품질기준에서는 Slag-CB를 저강도로 설계하도록 권장하고 있어 GGBS 치환율이 높은 고강도의 Slag-CB의 현장 적용에 다소 어려움이 있다. 이에 본 연구에서는 Slag-CB의 유연성 및 변형에 대한 저항성을 개선하여 취성파괴를 방지함으로 Slag-CB의 현장 활용성 및 적용성을 향상시키기 위해 나일론 섬유를 혼합한 Slag-CB 차수벽을 대상으로 압축거동 특성을 평가하고, 이를 비교·분석함으로 Slag-CB의 유연성 및 변형에 대한 저항성을 향상시킬 수 있는 방안을 제시하였다.

• 수산경영론집
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• 제41권2호
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• pp.107-133
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• 2010

As policy makers are often concerned about dynamic effects of demand behavior and its welfare analysis by quantity changes, the paper shows how dynamic price formation systems can be built up to analyze the effect of policy options to the markets dynamically. The paper develops dynamic model of price formation for fish from the intertemporal optimization of the consumer choice problem. While the resulting model has a similar form of the error correction types of dynamic price formation system, it provides the rational demand behavior contrary to the myopic behavior of error correction demand models. The paper also develops appropriate tools of dynamic welfare analysis in quantity space using only short-run demand estimates both theoretically and empirically as a first attempt in the literature of price formation and fisheries. The empirical results of Korean fish markets show that the dynamic model and the welfare measures are reasonably plausible. The methodology and theory of this research can be applied and extended to the commodity aggregation, dynamic demand estimation, and dynamic welfare effects of regulation in the similar framework. Thus, it is hoped that this will enhance its applications to the demand-side economics.

• 한국소음진동공학회논문집
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• 제13권7호
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• pp.562-569
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• 2003

An iterative modal analysis approach is developed to determine the effect of transverse open cracks on the dynamic behavior of simply supported pipe conveying fluid subject to the moving mass. The equation of motion Is derived by using Lagrange’s equation. The influences of the velocity of moving mass and the velocity of fluid flow and a crack have been studied on the dynamic behavior of a simply supported pipe system by numerical method. The presence of crack results In higher deflections of pipe. The crack section is represented by a local flexibility matrix connecting two undamaged beam segments i.e. the crack is modelled as a rotational spring. Totally. as the velocity of fluid flow and the crack severity are increased, the mid-span deflection of simply supported pipe conveying fluid Is Increased. The time which produce the maximum dynamic deflection of the simply supported pipe Is delayed according to the increment of the crack severity.