• 한국응급구조학회지
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• 제16권1호
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• pp.19-29
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• 2012

Purpose: This study was focused on the training effects of the cardiopulmonary resuscitation(CPR) which is based on the AHA guideline 2010 for lay person. The purpose of this study was to investigate the effectiveness of the CPR training for civilian by checking the performance ability of the subjects before and after the CPR education. Method: This study was a single primary experimental study designed with pre and post test. Study subjects were 55 apartment managers who participated in all test on December 5 and December 11, 2011. The tools of this study were CPR performing evaluation sheet and CPR teaching program(AHA). Data were analysed by descriptive statistics, t-test, repeated ANOVA and Bonferroni with SPSS 18.0 program. Result: The CPR practice performing ability was significantly increased by test. The CPR practice performing ability of the learning experience group had significantly higher score than that of non-experience group. The self-confidence on CPR practice when faced emergency situation was highly increased after practice training. Conclusion: Practical performance evaluation score has improved step by step. The primary and secondary practical evaluation showed a significant difference in all items and practice-oriented education was found to be effective in CPR training.

• Journal of Computing Science and Engineering
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• 제2권4호
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• pp.375-393
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• 2008

The dynamic cast operation allows flexibility in the design and use of data management facilities in object-oriented programs. Dynamic cast has an important role in the implementation of the Data Management Services (DMS) of the Mission Data System Project (MDS), the Jet Propulsion Laboratory's experimental work for providing a state-based and goal-oriented unified architecture for testing and development of mission software. DMS is responsible for the storage and transport of control and scientific data in a remote autonomous spacecraft. Like similar operators in other languages, the C++ dynamic cast operator does not provide the timing guarantees needed for hard real-time embedded systems. In a recent study, Gibbs and Stroustrup (G&S) devised a dynamic cast implementation strategy that guarantees fast constant-time performance. This paper presents the definition and application of a cosimulation framework to formally verify and evaluate the G&S fast dynamic casting scheme and its applicability in the Mission Data System DMS application. We describe the systematic process of model-based simulation and analysis that has led to performance improvement of the G&S algorithm's heuristics by about a factor of 2. In this work we introduce and apply a library for extracting semantic information from C++ source code that helps us deliver a practical and verifiable implementation of the fast dynamic casting algorithm.

• Journal of Mechanical Science and Technology
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• 제20권3호
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• pp.366-375
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• 2006

In this paper, it is intended to introduce a method to solve multi-objective optimization problems and to evaluate its performance. In order to verify the performance of this method it is applied for a vertical roller mill for Portland cement. A design process is defined with the compromise decision support problem concept and a design process consists of two steps: the design of experiments and mathematical programming. In this process, a designer decides an object that the objective function is going to pursuit and a non-linear optimization is performed composing objective constraints with practical constraints. In this method, response surfaces are used to model objectives (stress, deflection and weight) and the optimization is performed for each of the objectives while handling the remaining ones as constraints. The response surfaces are constructed using orthogonal polynomials, and orthogonal array as design of experiment, with analysis of variance for variable selection. In addition, it establishes the relative influence of the design variables in the objectives variability. The constrained optimization problems are solved using sequential quadratic programming. From the results, it is found that the method in this paper is a very effective and powerful for the multi-objective optimization of various practical design problems. It provides, moreover, a reference of design to judge the amount of excess or shortage from the final object.

• 대한기계학회논문집B
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• 제28권12호
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• pp.1475-1483
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• 2004

Loop thermosyphon(LTS) has many good characteristics such as low thermal resistance, no power consumption, noiseless operation and small size. To investigate the overall performance of LTS, we have performed various experiments varying three parameters: input power of the heater, working fluid(water, ethanol, FC3283) and filling ratio of the working fluid. At a combination of these parameters, temperature measurements are made at many locations of the LTS. The temperature difference between the evaporator and the condenser is used to obtain the thermal resistance. In addition, flow visualization using a high speed camera is carried out. The thermal resistance is not constant. It is lower at higher input power, which is one of the distinct merits of LTS. Flow instabilities are frequently observed when changing the working fluid, the input power and the filling ratio. The results show that the LTS can be readily put into practical use. Future practical application in electronic cooling is recommended.

• 인터넷정보학회논문지
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• 제8권4호
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• pp.17-29
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• 2007

본 논문에서는 RNG 기반의 스캐터넷 토폴로지 구성, 자기 치유 및 라우팅 경로의 최적화를 위한 알고리즘(RNG-FHR)을 제시하고, ns-2와 블루투스 확장인 blueware 시뮬레이터를 이용하여 알고리즘의 성능을 분석하였다. 소규모 분산망 환경에서 스캐터넷 구성, 노드의 링크 설정 및 자기 치유 관점에서 분석한 결과, 초기에는 이웃노드 발견을 위한 메시지 교환량이 증가하여 지연이 점차 증가하지만 시간이 지남에 따라 이웃노드 발견과 충분한 로컬 정보 교환에 따라 지연이 다소 줄어듦을 알 수 있다. 결국 블루투스 망을 RNG 기반으로 확장하여 소규모의 분산망에 적용하는 경우 소량의 메시지 교환과로컬 정보 교환으로 인해망 구성, 자기 치유 및 라우팅 경로의 최적화가 가능하여 성능과 구현측면에서 충분히 실현 가능함을 알 수 있다.

• 간호행정학회지
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• 제16권1호
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• pp.5-16
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• 2010

Purpose: This study was done to identify the effectiveness of CPR training for nurses in the 6-sigma course. Method: The participants were nurses and doctors who worked in the medical center. For data analysis, the SPSS/PC14.0 program was used. Result: The total 11 categories of the primary problems were revealed on the recognition of carrying out CPR by nurses and doctors. After understanding the nurses' CPR knowledge and the practical ability, the survey showed 14.97 points and 67.12 points. After the education, the scores were increased from 14.87 to 23.25 in knowledge and from 67.12 to 93.43 in practical ability. The 6-sigma problem was ended as worked up the management plan and understood the changes over the management improving team. Conclusion: This study carries an emphasis on understanding of various CPR performance problems applied with 6-sigma in ward. In addition, improvement activities in relation to policy of hospitals suggest the high possibilities that the application of the improvement activities could be extended into the entire hospitals.

• 한국통신학회논문지
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• 제31권6A호
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• pp.611-616
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• 2006

본 논문에서는 Max-Log-MAP 알고리듬을 바탕으로 Gray 부호화된 직교 QAM 신호를 위한 비트별 연판정 계산식의 실제 구현 방법을 제안한다. 비트별 연판정 계산식의 구현은 변조 차수, 심벌간의 거리 등 송수신 시스템이 서로 공유하는 정보들과 수신된 심벌 값만을 이용한다. 또한, 위상 변위기(phase shifter) 등 직교 변/복조에 사용되는 소자들의 비 이상적 특성으로 인해 발생되는 I/Q 위상 불균형을 갖는 QAM 신호의 반복 복호 성능을 비트별 연판정 방법을 이용하여 분석한다.

• Structural Engineering and Mechanics
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• 제14권1호
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• pp.21-38
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• 2002

A control algorithm combining viscous and non-linear Reid damping mechanisms has been recently proposed by the authors to command active friction dampers. In this paper, friction dampers and the proposed algorithm are applied to control the seismic responses of a nonlinear 20-story building. Piezoelectric stack actuators are used to implement the control algorithm. The capacity of each damper is determined by the practical size of piezoelectric actuators and the availability of power supply. The saturation effect of the actuators on the building responses is investigated. To minimize the peak story drift ratio or floor acceleration of the building structure, a practical sequential procedure is developed to sub-optimally place the dampers on various floors. The effectiveness of active friction dampers and the efficiency of the proposed sequential procedure are verified by subjecting the building structure to four earthquakes of various intensities. The performance of 80 dampers and 137 dampers installed on the structure is evaluated according to 5 criteria. Numerical simulations indicated that the proposed control algorithm effectively reduces the seismic responses of the uncontrolled 20-story building, such as inelastic deformation. The sub-optimal placement of dampers based on peak acceleration outperforms that based on peak drift ratio for structures subjected to near-fault ground motions. Saturation of piezoelectric actuators has adverse effect on floor acceleration.

• Journal of Electrical Engineering and Technology
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• 제9권4호
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• pp.1332-1342
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• 2014

This paper proposes a novel test circuit for SiC transistors. On-state resistance under practical application conditions is an important characteristic for the device reliability and conduction efficiency of SiC transistors. In order to measure the on-state resistance in practical applications, high voltage is needed, and high current is also necessary to ignite performance for the devices. A soft-switching circuit based on synchronous buck topology is developed in this paper. To provide high-voltage and high-current stresses for the devices without additional spikes and oscillations, a resonant circuit has been introduced. Using the novel circuit technology, soft-switching can be successfully realized for all the switches. Furthermore, in order to achieve accurate measurement of on-state resistance under switching operations, an active clamp circuit is employed. Operation principle and design analysis of the circuit are discussed. The dynamic measurement method is illustrated in detail. Simulation and experiments were carried out to verify the feasibility of the circuit. A special test circuit has been developed and built. Experimental results confirm that the proposed circuit gives a good insight of the devices performance in real applications.

• 한국항행학회논문지
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• 제8권2호
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• pp.129-135
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• 2004

본 논문에서는 의사위성의 기본개념과 더불어 응용방안에 대해 설명하였다. GPS의 성능 향상을 위한 많은 방법들이 현재 연구 중에 있다. 이러한 방법들은 대개 GPS 수신기외에 비컨(Becon) 수신기와 같은 별도의 장비를 요구한다. 의사위성의 경우 별도의 장비 없이 기존의 프로그램의 수정만으로도 GPS 성능을 향상시킬 수 있다. 본 논문에서는 의사위성만을 이용한 항법시스템과 보다 정밀한 항법 시스템을 위한 GPS와 의사위성의 통합 시스템에 대해서 소개하였다. 또한 의사위성의 장점에 대해 시뮬레이션을 통해 검증하였다.