• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.356-360
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• 2006

Recently, for the purpose of improving the isolation performance of impact noise, many resilient materials have been installed in a residential building. As one of the reduction method for improving the performance of light-weight impact noise, this study is focused on the load condition of floating layer over resilient material. We studied the correlation between the mass or load of the floating layer and the reduction of light-weight impact noise by experiments in reverberation chamber for testing the impact noise. The results show that the reduction of impact noise is improved by increasing the mass per unit area of floating layer until about $140kg/m^2$. But the reduction is not obvious by adding extra mass on the floating layer.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.26-33
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• 2004

In this study, a boundary-layer bleeding and a two-staged fuel injection were applied to a scramjet engine for suppressing unstart transition and improving the thrust performance under Mach 6 flight conditions. With the boundary-layer bleeding, the engine could operate without unstart transition around at the fuel equivalence ratio of unity ($\Phi$ = 1). The thrust increment from the no fuel condition (dF) increased to 2460 N, which was about 1.4 times as large as that of the case without the bleeding and maximum in our Mach 6 tests. It was confirmed that the boundary-layer bleeding suppressed the separation during the engine operation. The two-staged fuel injection was less effective for improving the thrust performance com-pared with the single-staged one with the bleeding at Mach 6.

• 한국정밀공학회지
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• 제14권2호
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• pp.120-128
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• 1997

In this paper, A design strategy of the Surface Mounting Device for accurate and better performance is studied. Analytical modeling, sensitivity analysis, and optimization are being conducted. The ANSYS software and experimental method are used for the verification of the analytical equations with boundary conditions. Through the sensitivity analysis, the most dominant design parameter can be detected. The optimum design parameters for improving the given performances are selected by using the optimiza- tion algorithm. The design tool based on the design strategy for the analysis, modeling, and optimization will be useful for are-design and better improving of the SMD.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.87-89
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• 2006

A handover for DVB-H(Digital Video Broadcasting for Handheld) is the action of switching a receiver from receiving one signal to receiving another, when moving between the border of their coverage areas. This paper proposes new approaches for improving loss-free handover performance in the DVB-H networks. The proposed handover schemes are targeted to two different DVB-H receivers: One is for the receivers equipped with GPS devices. The other is for ones without GPS support. The first handover approach modifies the cell description table(CDT) proposed in the literature[1]. The second proposes a novel handover region estimation technique based on a new handover map table(HMT). This new handover approach estimates a predefined hand over region described in the HMT using measured RSSIs signal patterns. The estimation success rate is simulated and the benefits of the proposed method are discussed considering time and power consumption.

• 한국ITS학회 논문지
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• 제17권3호
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• pp.46-58
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• 2018

농어촌지역에서 수요응답형교통(demand response transport, DRT)이 정착하기 위해서는 수요부족의 문제가 있는 농어촌버스보다 긍정적 측면이 많아야 된다. 연구는 기존 농어촌버스와 DRT가 혼용 운행되고 있는 지역에서 DRT의 중요도와 실행도(importance- performance analysis, IPA)를 분석하고, 농어촌버스 만족도와의 관계성 분석하기 위해 IPA의 불일치 이론을 적용한다. IPA 결과로 가장 시급한 개선항목은 DRT 운행범위이며 환승위치, 환승시간, 환승거리, 정시도착, 안전운전, 운행시간, 차량수가 개선항목이다. 불일치이론 결과 농어촌버스와 비교하여 DRT 활성화를 위해서는 실행도보다 중요도가 큰 경우, 환승 편리성, 운행 시간 및 범위, 운행차량에 대해 실행도를 높인다. 실행도보다 중요도가 작은 경우 차량청결도, 안전운전, 운영자 친절, 환승요소, 운행요소, 요금은 지속적인 실행도가 유지되도록 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.291-294
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• 2005

This paper presents a method of improving performance of an electromagnetic clutch for the next generation tank gun. One of the most important things in the design of the clutch is to satisfy the requirement for the maximum torque even if the torque is varied. To achieve this requirement, it is needed to expand the operation range of the torque. Consequently, we have performed shape changes in order to cancel magnetic flux bottlenecks on the magnetic path. Simulation results from the finite element method show that the method proposed in this paper is proper for the clutch.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 1997년도 추계학술대회논문집 기업경쟁력 향상을 위한 정보통신 기술의 활용
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• pp.283-295
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• 1997

Comparing two pharmaceutical companies which one is adopted a leading-edge information technology for years but the other is still operated by the traditional business styles. This study presented the power of the importance of information technology for improving business foundation for improving business foundation and the top manager have to control the resources of information technology more efficiently for rapid enterprise growth. Information technology adoptions should be considered as an assessing models which could performance the effects of user satisfaction productivity, performance and concentration on the job. The study results revealed that positive attitude toward usage and perceived behavioral control on information technology and helped more other than specific elements in the business. All the outcomes positively related to attitudes toward usage of information technology and its devices.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1436-1438
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• 2000

It is one of the most effective methods for improving the performance of electric railway vehicles to make better the wheel-rail adhesion characteristics. To study adhesion characteristic is to develop the equivalent reduction machine to experiment on the adhesion system. The experiment system makes it possible to change the wheel-rail adhesion force with various adhesion parameters, and therewith to test the adhesion control system with the reduction machine in a laboratory. In this paper, for improving adhesion performance shows actually control methods.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.659-664
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• 2006

It is one of the most effective method for improving the performance of electric railway vehicles to make better the wheel-rail adhesion characteristics. To study adhesion characteristic is to develop the equivalent reduction machine to experiment on the adhesion system. The experiment system makes it possible to change the wheel-rail adhesion force with various adhesion parameters, and therewith to test the adhesion control system with the reduction machine in a laboratory. In this paper for improving adhesion performance show actually control methods.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.800-803
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• 2006

본 논문에서는 여러 환경 변화에 민감한 특성을 가지고 있는 얼굴 인식의 성능 향상을 위해 혼합형 신경회로망 방식을 제안한다. 제안한 방식은 SOM과 LVQ를 이용하여 얼굴 인식의 성능을 향상시킨다. 제안한 방식의 유용성을 확인하기 위하여 ORL의 얼굴 영상을 이용하여 시뮬레이션을 수행하였다. 시뮬레이션 결과 제안한 방식이 고유얼굴 방식이나 은닉 마코프 모델 방식, 다층 신경회로망 방식보다 우수함을 확인하였다.