• 마이크로전자및패키징학회지
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• 제28권1호
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• pp.21-29
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• 2021

Recently, semiconductor chips and electronic components are increasingly being used in IT devices such as wearable watches, autonomous vehicles, and smart phones. As a result, there is a growing concern about device malfunctions that may occur due to electromagnetic interference being entangled with each other. In particular, electromagnetic wave emissions from wearable or flexible smart devices have detrimental effects on human health. Therefore, flexible and transparent electromagnetic interference (EMI) shielding materials and films with high optical transmittance and outstanding shielding effectiveness have been gaining more attention. The EMI shielding films for flexible and transparent electronic devices must exhibit high shielding effectiveness, high optical transmittance, high flexibility, ultrathin and excellent durability. Meanwhile, in order to prepare this EMI shielding films, many materials have been developed, and results regarding excellent EMI shielding performance of a new materials such as carbon nano tube (CNT), graphene, Ag nano wire and MXene have recently been reported. Thus, in this paper, we review the latest research results to EMI shielding films for flexible and transparent device using the new materials.

• Journal of Advanced Marine Engineering and Technology
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• 제30권2호
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• pp.260-266
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• 2006

A tracer gas technique based on ASTM Standard E741-83 was used to measure ventilation performances in a model chamber ($0.84m{\times}0.68m{\times}0.7m$) with an exhaust fan and a supply fan. Experiments were performed for the ventilation effectiveness on three types of mechanical ventilation systems. For all cases. higher ventilation effectiveness was found in the type to ventilation system due to shorter residual time of air compared to type 1 and type 3.

• International Journal of Advanced Culture Technology
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• 제9권4호
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• pp.94-101
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• 2021

This study is quasi-experimental study of nonequivalent control group pretest-posttest design which applied simulation nursing education programs by standardized patient instructor to look into the effect on the Teaching Effectiveness and Clinical Nursing Performance of nursing students. There was a significant difference between two groups in the Teaching Effectiveness of the nursing students(t= 3.68, p<0.001). There was a no significant difference between two groups in the Clinical Nursing Performance of the nursing students.(t = 1.724, p = 0.089). The simulation nursing education by standardized patient instructor program can help then relieve the Teaching Efficacy of the nursing students. In addition, it is required to develop an appropriate simulation nursing education by standardized patient instructor program considering level and experience of nursing students.

• 대한기계학회논문집
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• 제17권7호
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• pp.1678-1685
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• 1993

This paper considers a time delay control of noncolocated flexible mechanical systems in discrete time domain. A stability criterion suggested in the previous paper is,extended in the consideration of infinite mode property of flexible systems and finite control sampling frequency. Based on the stability criterion, the one step advanced discrete time derivative control is suggested, which can stabilize infinite number of modes of a flexible system. The sensitivity analysis shows the robustness of the one step advanced control to the system parameter uncertainties and time delay errors. Application to a simply supported beam verifies the extended stability criterion and the effectiveness of the one step advanced D-control.

• 한국군사과학기술학회지
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• 제5권1호
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• pp.96-106
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• 2002

Many modern guided weapon systems employ sophisticated target sensors as well as powerful computing systems. Due to such advanced features, they are required to achieve better guidance accuracy, and at the same time other guidance objectives for better weapon effectiveness and survivability. In this paper, we overview some of the technical considerations in such advanced guidance algorithm development, and briefly look at some related research works. More specifically, we discuss impact angle control, time-varying nature of the guidance system, time-to-go estimation, guidance loop stability, effect of autopilot lag and physical limitations in control variables, parasitic paths in guidance loops, etc. We also briefly look at some advanced concepts such as integrated guidance and control loop design, target adaptive guidance, guidance law development based on dual control concept, and terminal evasive maneuver.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.299-302
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• 2000

In this paper, a Inter-Working Function Unit(IWF) has been developed and designed in order to change to advanced subscriber system the Remote Subscriber System(RSS) that is operating with simple services(PSTN Function only). Regarding the cost and the effectiveness, RSS should be connected to Access Subscriber System with PCM cables directly. As this method being used, in the period of Retrofit, the connecting job covering RSS will be handled easily and safely.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.336-340
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• 2001

In a digital system, there are inevitable delays in calculations and applying the inverter output voltages to the motor terminals. Because of the delays, the conventional predictive current controller implemented in the digital system has large overshoot and large harmonics. A new predictive current controller, considering the delays, for a permanent magnet synchronous motor (PMSM) is presented. The effectiveness and feasibilities are shown by experimental results.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1632-1636
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• 2005

This paper presents synchronization of two identical Modified Chua's circuits using two strategies of error feedback coupling. In the first method the synchronization is achieved by linear unidirectional and in the second one by linear bidirectional error feedback coupling. Both proposed methods can make the states of the Modified Chua's circuits globally asymptotically synchronized. Numerical results are provided to show the effectiveness of the proposed approaches and to compare them together based on different criteria.

• 한국정보통신학회논문지
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• 제21권3호
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• pp.620-628
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• 2017

본 논문에서는 안전항해를 위한 IT서비스 집합인 16가지의 MSP 중 두 번째 항목인 항해 지원 서비스와 관련하여 설문조사 과정 등을 통해 항로 계획 공유 서비스를 도출하였다. 또한, 도출한 서비스의 유용성을 평가하기 위한 시나리오를 개발하였으며, 개발한 시나리오를 기반으로 FMSS를 활용하여 유용성을 평가하기 위한 시뮬레이션을 수행하였다. 이를 통해 근접도 평가, 제어도 평가, 심리적 평가에 대한 시뮬레이션 결과를 분석함으로써 항로 계획 공유 서비스의 유용성을 평가하였다. 만약 새로운 서비스를 평가하기 위한 실험을 실제 선박이나 VTS 센터에서 수행한다면 시간적/경제적 문제를 비롯하여 여러 위험이 뒤따를 수 있다. 따라서 시뮬레이션 기반의 예비 유용성 평가 과정이 요구되며, 서비스의 도입 및 시행에 있어서도 다방면의 검증 과정을 반드시 거쳐야할 것으로 판단된다. 왜냐하면, 유용할 것으로 기대되는 서비스일지라도 실제와 유사한 환경에서 평가를 진행해보면, 그 결과는 기대에 미치지 못할 수 있기 때문이다.

• 한국정보시스템학회지:정보시스템연구
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• 제15권1호
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• pp.145-168
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• 2006

Current computer viruses are one of the most serious problems in information age due to their potential demage and impact on use of information systems. To make the problem worse, virus development technology has been advanced rapidly, and use of network systems has expanded widely. Therefore computer viruses are much more complex and use of anti-virus software(AV S/W) is not enough to prrevent virus incidents. It implies that computer viruses as well as other information security matters are not solely a technical problem but also a managerial one. This study emphasized on computer virus controls from managerial perspective of information security and investigated factors influencing the effectiveness of computer virus controls. Organization's comprehensive security policies provide guidelines on how organization or individual can protect themselves from computer viruses. Especially, user's education has positive impact on user's security related characteristics. Based on the analysis of research model using structural equation modeling technique, security policies were influencing security controls and improving user's computer viruses related awareness. Also security controls had positive impact on security effectiveness. However, no significant relationship was found between user's security related characteristics and security effectiveness.