• 한국도로학회논문집
• /
• 제16권5호
• /
• pp.109-119
• /
• 2014

PURPOSES : The control delay in seconds per vehicle is the most important traffic operational index to evaluate the level of service of signalized intersections. Thus, it is very critical to calculate accurate control delay because it is used as a basic quantitative evidence for decision makings regarding to investments on traffic facilities. The control delay consists of time-in-queue delay, acceleration delay, and deceleration delay so that it is technically difficult to directly measure it from fields. Thus, diverse analysis tools, including CORSIM, SYNCHRO, T7F, VISTRO, etc. have been utilized so far. However, each analysis tool may use a unique methodology in calculating control delays. Therefore, the estimated values of control delays may be different by the selection of an analysis tool, which has provided difficulties to traffic engineers in making solid judgments. METHODS : This study was initiated to verify the feasibility of diverse analysis tools, including HCM methodology, CORSIM, SYNCHRO, T7F, VISTRO, in calculating control delays by comparing estimated control delays with that measured from a field. RESULTS : As a result, the selected tools produced quite different values of control delay. In addition, the control delay value estimated using a calibrated CORSIM model was closest to that measured from the field. CONCLUSIONS : First, through the in-depth experiment, it was explicitly verified that the estimated values of control delay may depend on the selection of an analysis tool. Second, among the diverse tools, the value of control delay estimated using the calibrated microscopic traffic simulation model was most close to that measured from the field. Conclusively, analysts should take into account the variability of control delay values according to the selection of a tool in the case of signalized intersection analysis.

• 임상간호연구
• /
• 제14권1호
• /
• pp.33-44
• /
• 2008

Purpose: This study was performed to determine the effects of foot reflexology on pain and quality of sleep in patients with terminal cancer. Method: Quai-experimental research design was used. The subjects of this study were consisted of 19 for experimental group and 18 for control group. Visualue Scale(VAS) was used as the measurement tool of pain in this study, Verra & Snyder-Halpern Sleep Scale(VSH) and Visual Analogue Scale(VAS) were used as the measurement tool of perceived quality of sleep. Data were analyzed using statistical methods such as frequency, percent, $x^2$-test, t-test using SPSS WIN 12.0 program. Results: The hypothesis 1 that the experimental group with reflexology has less degree of pain than the control group without reflexology was supported (t=5.41, p<.001). The hypothesis 2 that the experimental group with reflexology has higher degree of VSH Scale than the control group without reflexology was supported(t=2.37, p=.02). The hypothesis 3 that the experimental group with reflexology has the difference among the mean of sleep VAS Scale during the 12 measurement periods was not supported(F=1.63, p=.08), and no significant interactions between group and time. Conclusion: It is considered that reflexology is effective for reducing cancer pain and improving quality of sleep in patients with terminal cancer.

• 한국실천공학교육학회논문지
• /
• 제2권2호
• /
• pp.61-67
• /
• 2010

인터넷기반의 IT기기의 발달과 함께 다양한 디자인을 선호하는 소비자니즈에 따른 새로운 제품의 출시를 위해서 이에 필요한 생산도구인 금형제작에 있어서도 리드타임이 짧은 금형개발기술의 필요성이 절실히 요구되고 있는 것이 현실이다. 금형개발기간 단축을 위한 공정기술이 금형개발 산업체에서의 매우 중요한 실무교육 중 하나이고, 신제품에 대한 납기단축, 품질 및 원가 세 가지 요소가 고루 갖춰지지 않는다면 경쟁에서 힘들기 때문이다. 본 논문에서는 기존의 제품개발에 따른 금형개발 교육훈련 프로그램이 체계적이지 못하고, 그리고 현실성이 부족한 교육훈련과정을 개선하여 실질적으로 현장에서 이행될 수 있는 실무기술능력 향상과 금형개발기간 단축을 위한 공정기술개선으로 실무중심 교육훈련 프로그램을 적용한 모형으로 발전시켜보고자 한다.

• 품질경영학회지
• /
• 제43권4호
• /
• pp.471-488
• /
• 2015

Purpose: Double sampling $T^2$ chart is a useful tool for detecting a relatively small shift in process mean when the process is controlled by multiple variables. This paper finds the optimal design of the double sampling $T^2$ chart in both economical and statistical sense under Weibull failure model. Methods: The expected cost function is mathematically derived using recursive equation approach. The optimal designs are found using a genetic algorithm for numerical examples and compared to those of single sampling $T^2$ chart. Sensitivity analysis is performed to see the parameter effects. Results: The proposed design outperforms the optimal design of the single sampling $T^2$ chart in terms of the expected cost per unit time and Type-I error rate for all the numerical examples considered. Conclusion: Double sampling $T^2$ chart can be designed to satisfy both economic and statistical requirements under Weibull failure model and the resulting design is better than the single sampling counterpart.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1993년도 하계학술대회 논문집 A
• /
• pp.421-423
• /
• 1993

A real time simulation is an effective tool for use in design, performance evaluation, and testing of the vehicle dynamic system. An alternate approach is to use a computer system designed specifically to provide an integrated simulation environment in which all aspects of hardware-in-the-loop simulation task have been taken into account.

• 한국공작기계학회논문집
• /
• 제15권1호
• /
• pp.63-69
• /
• 2006

This study deals with the friction welding of A2024- T6 to A6061- T6; The friction time was variable conditions under the conditions of spindle revolution of 2000rpm, friction pressure of 50MPa, upset pressure of 100MPa, and upset time of 5.0seconds. Under these conditions, the microstructure of weld interface, tensile fracture surface and mechanical tests were studied, of friction weld, and so the results were as follows. 1. When the friction time was 1.5seconds under the conditions, the maximum tensile strength of the friction weld happened to be 292MPa, which is $94.2\%$ of the base material's tensile strength(310MPa). At the same condition, the maximum shear strength was 2l2MPa, which is equivalent to $103\%$ of the base material's shear strength (205MPa). 2. At the same condition, the maximum vickers hardness was Hv 146 at A2024- T6 nearby weld interface, which is higher Hv3 than condition of the friction time 0.5seconds, and the maximum vickers hardness was Hvl20 from weld interface of A6061-T6, which is higher Hv28 then base material's. 3. The results of microstructure analysis show that the structures of two base materials have fractionized and rearranged along a column due to heating and axial force during friction, which has affected in raising hardness and tensile strength.

• 한국방사선학회논문지
• /
• 제6권4호
• /
• pp.305-311
• /
• 2012

본 연구에서는 MR영상의 신호획득 기법 중 TE(Time of Echo)신호와 움직임에 의한 인공물을 줄이기 위하여 신호수신 시간을 짧게 하는 UTE(Ultra Time of Echo)기법으로 신호를 획득하여 TE신호와 UTE신호의 차이를 공학적 도구인 MatLab의 DWT(Discrete Wavelet Transform) ToolBox를 이용하여 프로그램밍을 하여 특징을 추출한 후 UTE 기법의 유용성을 평가하고자 하였다. 추출된 특징값을 이용하여 TE신호(T2) 특징값과 UTE신호 특징값을 비교한 결과 거의 일치함을 알 수 있었다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.792-793
• /
• 2005

Circuit testing process is very important in IC Manufacturing there are two ways in research for circuit testing improvement. These are ATPG Tool Design and Test simulation application. We are interested in how to use parallel technique such as one-side communication, parallel IO and dynamic Process with data partition for circuit testing improvement and we use one-side communication technique in this paper. The parallel ATPG Tool can reduce the test pattern sets of the circuit that is designed in laboratory for make sure that the fault is not occur. After that, we use result for parallel circuit test simulation to find fault between designed circuit and tested circuit. From the experiment, We use less execution time than non-parallel Process. And we can set more parameter for less test size. Previous experiment we can't do it because some parameter will affect much waste time. But in the research, if we use the best ATPG Tool can optimize to least test sets and parallel circuit testing application will not work. Because there are too little test set for circuit testing application. In this paper we use a standard sequential circuit of ISCAS89.

• 한국공작기계학회논문집
• /
• 제16권3호
• /
• pp.109-116
• /
• 2007

The present study examined mechanical properties according to the change of outer circumference in the friction welding of A2024-T4 stock, which is used much as aircraft structure, truck wheel, stainless materials and A2024-T4 stock with 10 hollow at the center. Welding conditions were fixed at RPM 2,000rpm, friction pressure of 50MPa, friction time of 1.5sec, upset pressure of 120MPa and upset time of 2.0 seconds. From the result of this study were drawn conclusions as follows : According to the result of a tensile strength test, the solid shaft showed linear increase of tensile strength with the change of outer circumference, the hollow shaft showed maximum tensile stength when the length (L) was 2mm and decrease of tensile strength with the change of outer circumference, hardness appeared to increase and then decrease for welding interface, and it showed maximum hardness 155Hv at L=5mm of the solid shaft. Bending strength increased linearly far change of the distance (L) of outer circumference in the solid shaft and then decreased linearly in the hollow shaft. the result of examining tissue, the tissue grew finer around the welding interface and divided the basic material and the welding surface.

• 정보처리학회논문지A
• /
• 제12A권7호
• /
• pp.583-588
• /
• 2005

임베디드 시스템에서 요구하는 SoC 프로그램을 개발하기 위해서는 자원이 풍부한 호스트 시스템에서 원격으로 디버깅할 수 있는 도구가 필요하다 그러나 GDB를 이용하는 기존의 원격 디버깅 도구는 SoC 프로그램의 수행 시에 정보를 실시간으로 제공하지 못하므로 프로그램의 수행 양상을 실시간으로 감시하기 어렵고, 도구에 제한적인 고가의 어댑터를 사용한다. 본 논문은 지정된 명령문의 수행시마다 SoC의 상태를 수행 중에 기록할 수 있는 실시간 추적도구를 소개하고, 원격 디버깅을 위한 경제적인 USB-JTAG 어댑터를 제안한다 그리고 본 도구가 PXA255 프로세서 기반의 타겟 시스템에서 합성 프로그램의 수행을 실시간으로 추적할 수 있음을 보인다.