• 전자공학회논문지B
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• 제32B권11호
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• pp.1434-1444
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• 1995

Current test has recently been known to be a promising testing method in CMOS VLSI because conventional voltage test can not make sure of the complete detection of bridging, gate-oxide shorts, stuck-open faults and etc. This paper presents a new BIC(built-in current sensor) for the internal current test in CMOS logic circuit. A single phase clock is used in the BIC to reduce the control circuitry of it and to perform a self- testing for a faulty current. The BIC is designed to detect the faulty current at the end of the clock period, so that it can test the CUT(circuit under test) with much longer critical propagation delay time and larger area than conventional BICs. The circuit is composed of 18 devices and verified by using the SPICE simulator.

• 전기학회논문지
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• 제59권2호
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• pp.328-332
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• 2010

The SLF(Short Line Fault) breaking capability test for high voltage class $SF_6$ GCB(Gas Circuit Breaker) was conducted. Simplified LC resonant circuit test facility was used for SLF breaking test. During test, Test current was measured by Rogwski coil and arc voltage was measured by voltage divider. Arc conductance was calculated by using these test results before 200ns at current zero. Critical arc conductance value at rated voltage 145kV class is about 2.3mS regardless of breaking current magnitude and arc conductance value at rated voltage 170kV class is about 2.6mS.

• 대한기계학회논문집A
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• 제24권3호
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• pp.761-768
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• 2000

In order to investigate how the fatigue damage effects on the critical properties of superconductor, a fatigue test at room temperature and an Ic measurement test at 4.2K were carried out in this study, respectively, using a 9 strand Cu-Ni/NbTi/Cu composite cable. Through the fatigue test of a 9 strand Cu-NUNbTi/Cu composite cable, a conventional S-N curve was plotted even though there was a possibility of fretting among strands. It was found that the maximum stress corresponding to the inflection point on the S-N curve obtained was nearly the same value as the yielding strength of cable obtained from the static tensile test. However, the effect of cabling in multi-strands superconducting cable on the fatigue strength was not noticeable. The critical current(Ic) measurement was carried out at 4.2K in a NbTi strand out of the fatigued cable. It showed a degradation of lc at high stress amplitude regions over 380NTa, and the degradation became significant as the applied stress amplitude increased.

• 간호행정학회지
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• 제17권4호
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• pp.443-450
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• 2011

Purpose: This study was a descriptive correlation study to increase understanding of, and relationships among critical thinking disposition, clinical decision making and job satisfaction of cancer center nurses. Method: The participants in this study were 150 nurses working in one cancer center located in Gyeonggi Province. The statistic program, SPSS WIN17.0 was used for data analysis and data were analyzed using t-test, ANOVA, and Pearson correlation. Results: The critical thinking disposition of the participants showed statistically significant differences according to areas of practice (F=4.426, p=.005), and current position (F=9.346, p=.000). For clinical decision making of the participants, statistically significant differences were found according to current position (F=10.667, p=.000). Furthermore, for job satisfaction, there were statistically significant differences according to income (F=6.779, p=.002), length of career (F=2.701, p=.033) and current position (F=5.423, p=.005). There were significant positive correlations for critical thinking disposition with clinical decision making, and with job satisfaction. Conclusions: The results of the study indicate that to improve clinical decision making and job satisfaction of cancer center nurses, it is necessary to increase critical thinking disposition. To make this change, appropriate programs are needed to increase critical thinking and clinical decision making of general cancer center nurses.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.249-251
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• 1996

Ag coating on the textured YBCO and PTFE coating on the sintering YBCO were prepared. The critical current densities of different YBCO samples with and without coatings were compared. Both of Ag coating and PTFE coating can well protect YBCO from moisture and $CO_2$.

• 한국초전도ㆍ저온공학회논문지
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• 제20권4호
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• pp.31-35
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• 2018

When REBCO coated conductors (CCs) are applied to superconducting devices such as coils and magnets, they are subjected to deformation in various modes such as compression/tension bending, uniaxial/transverse tension and torsion. Despite outstanding performances by REBCO CC tapes, their electromechanical properties have been evaluated primarily under uniaxial tension, therefore data about the critical current ($I_c$) response in the compressive strain region are lacking. In this study, the characteristic responses of $I_c$ in REBCO CC tapes under bending strains in the range from tensile to compressive were evaluated. The springboard bending beam was used, wherein the CC tape sample was soldered onto the surface of the springboard. A Goldacker-type bending test rig, which lacks a support holding the sample during testing, was used as a comparator. Degradation in $I_c$ behaviors, including strain sensitivity, in differently processed REBCO CC tapes were examined based on the test rig used.

• 한국응급구조학회지
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• 제10권3호
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• pp.5-20
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• 2006

Purpose: This study examines the degree of empowerment recognized by the 1st paramedics and the trend of their critical thinking, analyzes correlations between empowerment and critical thinking to reveal whether there is statistically significant difference between them and then is to provide basic materials necessary for research on empowerment and critical thinking. Method: This study distributes 105 structured self-report questionnaires to the 1st emergency medical technicians working at fire fighting police boxes, general hospitals, clinics and emergency medical information centers in G Metropolitan City and J province from April 29 to May 28, 2006, collects their responses directly and analyzes results with t-test, F-test(ANOVA) and Pearson's Correlation Coefficient. Result: 1. First, average score of empowerment of subjects was 4.68 out of 6 and according to scores by area, capacity 5.98 was highest, followed by significance 5.41, self- determination 4.44 and effectiveness 3.79. 2. degree of empowerment according to general characteristics of subjects showed statistically significant differences in final education(F=2.714, p= .049), level of salary (F=3.298, p= .014) and satisfaction of current job (F=5.399, p= .001). 3. average score of critical thinking of subjects was 3.28 out of 7 and according to areas, no bias 3.95 was highest, followed by maturity 3.68, structure 3.35, inquisitiveness 3.11, pursuit of truth 3.07, critical thinking and self-confidence 3.00, analyticity 2.98. 4. degree of critical thinking by general characteristics of subjects showed statistically significant differences in age(F=2.577, p= .041), final education (F=7.877, p= .000), current workplace (F=3.513, p= .018), level of salary(F=4.628, p= .002), satisfaction with current job(F=6.879, p= .000) and intention to transfer current job(t=15.21, p=.000). 5. as a result of correlations between empowerment and critical thinking of subjects, Pearson correlation coefficients between whole empowerment and critical thinking were r= .21, p=.013. Conclusion: It is considered that the 1st paramedic managers must seek how to keep and manage empowerment and development of education and training program which can enhance critical thinking is needed. Further, emergency educators must develop educational program based on the concept of empowerment to establish early awareness of a desirable organization culture and increase understanding of empowerment in the process of education.

• 한국초전도ㆍ저온공학회논문지
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• 제9권1호
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• pp.72-75
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• 2007

Magnetization loss of HTS wire is strongly dependent on the critical current density and the aspect ration of the HTS wire. This paper presents the magnetization loss of stacked BSCCO wire and stacked YBCO wires which had different critical current densities. Width of the BSCCO wire was 4mm and widths of two YBCO wires were 4mm and 8mm. Single wire, two stacked three stacked and four stacked wires were fabricated and tested. Ratio of magnetization loss of BSCCO wire to YBCO wire was presented at single wire. For stacked wire, ratio of magnetization loss of single wire to stacked wire was presented. Test results shows that magnetization losses of stacked wires were greater than that of single wire at large high magnetic field above critical magnetic field.

• Progress in Superconductivity
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• 제3권1호
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• pp.99-103
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• 2001

We have conducted two runs of interlaboratory comparison on Ag-sheathed Bi-2223 tapes to evaluate the level of measurement techniques for the critical current measurement. Two classes of specimens were prepared for parallel and serial routings and sent to four participating laboratories. The critical currents of specimens were measured at 77 K in zero magnetic field. In the first comparison, we used twenty different Bi-2223 tapes as specimens for comparison and participating laboratories measured the specimens using their own instruments and procedures. As a result, the scattering of data on the first comparison showed -3.0% to +l2.2% for the parallel routing and -0.7% to +l5.1% for the serial routing. Major sources of these variations were attributed to different measurement techniques. Thus, the second comparison of measurement was done on the same specimens under specified measurement conditions, particularly in terms of cooling procedure and sweep rate of the test current. The variations for the second comparison were decreased -3.1% to +3.2% far the parallel routing and -1.8% to +7.7% fur the serial routing.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.1254-1257
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• 2004

This paper presents a built-in current sensor(BICS) that can detect defects in CMOS integrated circuits through current testing technique - Iddq test. Current test has recently been known to a complementary testing method because traditional voltage test cannot cover all kinds of bridging defects. So BICS is widely used for current testing. but there are some critical issues - a performance degradation, low speed test, area overhead, etc. The proposed BICS has a two operating mode- normal mode and test mode. Those methods minimize the performance degradation in normal mode. We also used a current-mode differential amplifier that has a input as a current, so we can realize higher speed current testing. Furthermore, only using 10 MOSFETS and 3 inverters, area overhead can be reduced by 6.9%. The circuit is verified by HSPICE simulation with 0.25 urn CMOS process parameter.