• Journal of Haehwa Medicine
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• v.17 no.1
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• pp.1-9
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• 2008

Purpose: This study was attempted to verify the effects of Tai Chi exercise on the depression and self efficacy of the patients with rheumatoid arthritis. Method: It employed a non-equivalent control group pre- and post-test design. The research instruments used in this study were depression and self efficacy. Thirty-two patients in the experimental group carried out 50 minutes of Tai Chi exercise for 12 weeks, and 29 patients in the control group did not. Before and after the experiment, both groups were tested for depression and self efficacy. Collected data were processed using the SPSS/WIN 10.0 program analyzing by the frequency, percentage, $X^2$- test, and t-test. Results: Depression significantly decreased in the experimental group. However the improvement in self efficacy of the rheumatoid arthritis patients was not statistically significant but slight enhancement was. Conclusion: Tai Chi exercise is an effective nursing intervention that can be used for rheumatoid arthritis patients.

• Journal of Institute of Control, Robotics and Systems
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• v.22 no.11
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• pp.944-951
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• 2016

Resistance temperature detectors (RTDs) and thermocouple sensors are broadly used to measure temperatures in the engineering and research fields. The contents of this standard calibration procedure (SCP) describe procedures related to the calculation of an electrical temperature calibrator and show different ways to indicate the calibration results, such as measurement uncertainty. As an SCP for the electrical temperature calibrator has not been developed yet, we studied the SCP and found a solution to this problem. In this paper, we present a mathematical model of the data and measurement variations with the calibration data results.

• Korean Journal of Child Studies
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• v.21 no.4
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• pp.243-257
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• 2000

This empirical test of the efficacy of the literature-based reading instruction was conducted with 63(31 male and 32 female) 2nd grade elementary school children. Subjects in the experimental group had 40-45 minutes literature-based reading instruction twice weekly; those in the control group had only basic text reading. Procedures included a pilot study, pre-test, experimental period, and post-test. Research instruments included the Basic Learning Skill Test(Park et al., 1988), the Qualitative Reading Inventory(Leslie & Caldwell, 1990), and the Elementary Reading Attitude Survey(Mckenna & Kear, 1990). Data were graded and scored by each research question and then analyzed with a t-test of differences between the groups. The experimental group showed higher word recognition, text comprehension, and story grammar strategies than the control group. They also showed more improvement in each of these categories than the control group.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2321-2323
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• 1998

A control system using a PLC has been developed for a dual tower drier(DTD) in a CANDU type nuclear power plant. This system will replace the existing DTD control system which was implemented with mechanical timers and relays. The new control system makes it possible for an operator to perform more precise time and dew point control for the DTD, thanks to the high efficiency and flexibility of the PLC. The operational cost for the control system is much reduced compared to the existing system.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1995.11a
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• pp.184-192
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• 1995

Although ship's draught information onboard is substantial for both the safety of navigation and the estimation of loaded cargoes its accuracy depends in traditional surveying method on the skillfulness of observers and the condition of the sea surface round the vessel. To obtain more accurate information accessibly measuring instruments with sophisticated sensors such as mechanical electronic and ultrasonic transducers have been developed. however they have still limitation in accuracy and in making up a system due to the complexity of processing signal. In this paper we propose a he technique for analyzing ultrasonic pulse signal in order to improve the measurement accuracy and simplify a remote sensing system of draught by ultrasonic waves. This technique is useful for measuring draught being considered the influence of sea surface fluctuation and for transferring its data briefly to required equipment in integrated bridge system.

• Journal of Electrical Engineering and Technology
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• v.9 no.2
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• pp.670-676
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• 2014

The objective of this research is to utilize the ultrasonic method to analyze the property of partial discharge (PD) which is generated by the winding of the insulation stator in the generator. Therefore, a PD measurement system is built based on ultrasonic and virtual instruments. Three types of PD models (internal PD model, surface PD model and slot PD model) have been constructed. With the analysis of these experimental results, this research has identified the ultrasonic signals of the discharges which were produced by three types of PD models. This analysis shows the different features among these PD types. Both the time domain and frequency domain of the ultrasonic signals are obviously different. In addition, an experiment based on a large rotating machine has been done to analyze ultrasonic noises. The result indicates that the ultrasonic noises can be wiped off by the filters and algorithms. The application of this system is convenient for the detection of early signs of insulation failure, which is an effective method for diagnosis of insulation faults.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.955-956
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• 2007

차단기는 전력계통에서 사고시 고장점을 분리 차단하여 계통을 보호하고, 복구 완료시 전원을 투입하는 장치로 전력기기 중 가장 중요한 제품이며, 특히 저압 차단기는 실제 가정 및 소규모 공장에서 많이 사용되고 있어 안전성과 성능의 신뢰성이 가장 중요한 제품이므로 단락성능에 대한 성능평가가 이루어져야 한다. 이와 같은 단락성능평가를 위한 단락시험설비의 측정시스템은 시험 신뢰도의 확보를 위해 주기적으로 교정하여 사용하여야 한다. 본 논문에서는 측정시스템으로 구성된 각 계측기의 교정 결과를 이용하여 전체 측정시스템을 교정하고자 한다.

• KEPCO Journal on Electric Power and Energy
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• v.5 no.3
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• pp.165-171
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• 2019

The steam turbine used in nuclear power plant is modeled for the purpose of verification of control system rather than the operator education. The valves, reheater and generator are modeled also and integrated into the simulator. After that, the operation data and the designed data such as heat balance diagram are utilized to identify the model parameters. It was evident that model outputs of developed simulator are very close to the measured operating ones. The simulator within dynamic model was used to verify and validate the whole control system together with field instruments. And the target plant has been operating long time.

• Korean Journal of Optics and Photonics
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• v.16 no.5
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• pp.433-439
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• 2005

We have developed a biosensor reading system using a white light source and a color-sensor. To reduce the environmental effect, we used the ratio of specific color intensity to the entire white light intensity. Also we could improve the responsibility of the system by controlling the amplification of the color sensor output.

• Asia Pacific Journal of Business Review
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• v.3 no.2
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• pp.67-87
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• 2019

Anti-dumping instruments among trading partners have been the subject of research by both academicians and practitioners. This study attempts to establish an early-warning model of anti-dumping against Chinese textile exporting companies, which have suffered from anti-dumping regulations and got arbitration awards. After reviewing theories of anti-dumping arbitration, early-warning and relationship marketing, the measuring items and relationship marketing model of Chinese textiles exporters are investigated. Empirical methods are selected based on early-warning theories of companies. Eighty percent of 156 valid questionnaires by surveys and interviews are used as training data via Binary-Logistic regression while the other twenty percent are validated in the model. As a result, a proper early-warning model has been established.