• 한국공간구조학회논문집
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• 제18권2호
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• pp.99-108
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• 2018

This paper presents the design, analysis, and experimental evaluations of precast reinforced UHPC (ultra high-performance concrete) beams with a new design concept of non-uniform flexural members. With outstanding mechanical properties of UHPC which can develop the compressive strength up to 200MPa, the tensile strengths up to 8~20MPa and the tensile strain up to 1~5%, a non-uniform structural shape of UHPC flexural beams were optimally designed using three-dimensional finite element analysis. The experiments were carried out and compared with the design strength in order to verify the performance of them. Proposed non-uniform UHPC beams were evaluated by a series of three-point beam loading test as well as estimated by design bending and shear strength of members. The newly designed UHPC beams show excellent performances not only in transverse load capacities but also in deformation capacities.

• Journal of Magnetics
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• 제15권2호
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• pp.85-90
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• 2010

This paper deals with the efficiency evaluations in a synchronous reluctance motor (SynRM) versus a permanent magnet assisted SynRM (PMASynRM), using a coupled transient finite element method (FEM) and Preisach modeling, which is presented to analyze the characteristics under the effects of saturation and hysteresis loss. We herein focus on the efficiency evaluation relative to hysteresis loss and copper loss on the basis of load conditions in a SynRM and PMASynRM. Computer simulation and experimental results for the efficiency, using a dynamometer, show the propriety of the proposed method and the high performance of the PMASynRM.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.232-235
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• 2001

This paper presents a circuit of the quasi-resonant DC link to achieve soft-switching three phase inverter using intelligent IGBT power module. The soft-switching operation in this circuit is confirmed simulation and experimental results. Its conductive noise is measured for electrical AC motor drive as compared with that of the conventional hard switching inverter.

• International Journal of Automotive Technology
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• 제5권2호
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• pp.115-122
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• 2004

Evaluation of active safety control systems usually relies heavily on field testing and is time-consuming and costly. Advances in computer simulations make it possible to perform exhaustive design trials and evaluations before field testing, and promise to dramatically reduce development cost and cycle time. In this paper, a comprehensive simulation-based evaluation procedure is proposed, which combines standard evaluation maneuvers, worst-case techniques, and a driver model for closed-loop path following evaluations. A vehicle dynamic controller (VDC) for a popular Sport Utility Vehicle is evaluated using the proposed procedure. Simulation results show that the proposed procedure can be used to assess the performance of the VDC under various conditions and provides valuable information for the re-design of the VDC.

• International Journal of Railway
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• 제6권3호
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• pp.125-130
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• 2013

Most of the test methods used for determining the acoustic performance of the noise barriers in Korean standards address the sound-proof panels but refer to noise barriers as a whole system or their in-situ performances less. Many new types of trains with different operating speeds have been developed and produced, and civil appeals against railway noise are becoming quite extensive. Considering these latest changes of circumstances, it is necessary to investigate the current standards and specifications pertaining to railway noise barriers. In this paper, criteria for the measurements and evaluations of noise barriers and sound-proof panels are examined and experimental studies are introduced. In order to suggest more efficient methods for reasonable evaluations of the noise barriers, frequency spectrums of the noise source, the power of the actual railway vehicles, are investigated and introduced.

• 한국산학기술학회논문지
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• 제18권2호
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• pp.356-373
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• 2017

본 연구는 발전공기업의 성과지향보수제도가 실질적으로 직원들의 조직몰입도를 유도하여 조직의 효율성 및 조직성과 제고에 기여하는 지의 여부를 실증적으로 분석하여 공기업의 성과지향보수제도가 나아가야 할 방향을 제시해보려고 했다. 연구결과에 의하면 성과연봉제의 개인별 성과보상 적정성과 성과연봉 확정을 위한 개인별 근무평정은 조직몰입에 유의한 영향을 미치는 반면, 성과배분제의 외부평가(정부경영평가) 및 내부평가는 조직몰입에 유의한 영향을 미치지 않았다. 성과연봉제와 성과배분제 모두는 조직성과에 유의한 영향을 미치는 것으로 나타났다. 또한 성과지향보수제도 중 성과연봉제의 보상적정성 및 개인별 근무평정은 조직성과에 직접적으로 영향을 미치며, 조직몰입을 경유하여 간접적으로도 조직성과에 영향을 주어 조직몰입도의 부분적 매개효과가 있음이 검증되었으나, 외부평가와 내부평가는 조직몰입과의 영향관계가 유의하지 못하여 매개효과 검증의 의미가 없는 것으로 나타났다. 연구결과가 시사하고 있는 점은 공정하고 수용성 있는 평가지표 개발 및 성과지향 보수체계에 대한 제도운영 정책을 회사, 노조 및 직원 모두의 지혜를 모아 수립하여 시행한다면 성과지향보수제도가 회사에 대한 직원들의 애사심 고취 및 조직성과를 향상시켜 국민과 정부에게 신뢰받는 진정한 공기업으로서의 역할을 할 수 있게 된다는 것이다.

• 한국통신학회논문지
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• 제33권9B호
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• pp.786-794
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• 2008

IETF의 NETCONF 워킹그룹에서는 구성관리의 상호운용성을 보장하기 위하여 구성관리표준 프로토콜인 NETCONF에 대한 표준을 제정하고 있다. 이러한 구성관리에서는 상호운용성 뿐만 아니라 성능도 구성관리에서 중요한 요소 중의 하나이지만 현재까지는 성능에 대한 논의가 많이 이루어지고 있지 않은 실정이다. 이러한 점을 고려하여 본 논문에서는 NETCONF 프로토콜의 성능을 측정하고 성능을 향상시킬 수 있는 방안을 제시한다. 또한 제시된 방안에 대한 성능검증 결과를 제시한다.

• 전자통신동향분석
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• 제33권4호
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• pp.43-53
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• 2018

As face recognition (FR) has been well studied over the past decades, FR technology has been applied to many real-world applications such as surveillance and biometric systems. However, in the real-world scenarios, FR performances have been known to be significantly degraded owing to variations in face images, such as the pose, illumination, and low-resolution. Recently, visual intelligence technology has been rapidly growing owing to advances in deep learning, which has also improved the FR performance. Furthermore, the FR performance based on deep learning has been reported to surpass the performance level of human perception. In this article, we discuss deep-learning based high-performance FR technologies in terms of representative deep-learning based FR architectures and recent FR algorithms robust to face image variations (i.e., pose-robust FR, illumination-robust FR, and video FR). In addition, we investigate big face image datasets widely adopted for performance evaluations of the most recent deep-learning based FR algorithms.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1241-1244
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• 1996

This paper present a performance evaluation method for Timed Place Petri Nets modeled by Live-and-Bounded Circuits (LB-circuits) through a bottom-up approach. The method can handle the case for the nets having common resources(CR). The target system is divided into the sub-systems by disconnecting the common Transition-Transition-Path(TTP) or Place-Place-Path (PPP) between sub-systems. The common PPP pattern is classified into Parallel Common Resource (PCR) and Sequential Common Resource (SCR) in detail for handling common resources. We evaluate the performance of each divided sub-system, and calculate the sub-systems affect on the performance of the whole system. The facts are generalized as a theorem. The developed theorem are applied into the performance evaluation of an automated assembly system shown in an example. All the results are verified by simulation.

• Computers and Concrete
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• 제23권6호
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• pp.459-470
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• 2019

Apart from strength properties, durability, toughness and workability are also important criteria in defining the performance of a concrete structure. Hence "High Performance Concrete (HPC)" is introduced. It is different from high strength concrete and can have various applications. In this paper, the properties (Mechanical and Durability) of High Performance Concrete blended with bagasse ash at 5%, 10%, 15% and 20% are studied. However, it is difficult to analyze the performance based on different properties obtained from different experiments. Hence it is necessary to combine all the criteria/properties into a single value to obtain a result by a technique called Analytical Hierarchy Process (AHP).It is an effective tool for dealing with complex decision making, and may aid the decision maker to set priorities and make the best decision. In addition, the AHP incorporates a useful technique for checking the consistency of the decision maker?s evaluations, thus reducing the bias in the decision making process.