• The Transactions of the Korean Institute of Electrical Engineers P
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• v.59 no.4
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• pp.351-357
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• 2010

In this paper, a vector control of the IPMSM drives for the next generation domestic high speed railway system is presented. The applied control method uses one pulse mode field weakening control in constant power region, and maximum torque control per ampere control in constant torque region considering current and voltage limits. An overmodulation control interval is inserted to improve the transient characteristics during transition period of the control modes. Simulation programs based on Matlab/Simulink are developed. Finally the designed system is verified by simulation and their characteristics are analyzed by the simulation results.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.7
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• pp.1351-1362
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• 1992

Qualitative models in model-based expert system needs modeling paradigm which provides intelligent control of modeling assumptions and extracts robust inferences without quantitative information about the system to be modeled. Qualitative reasoning methodologies has proved the property of the completeness but not the soundness to the corresponding quantitative model. We propose new methodology of qualitative reasoning by introducing the concept of Centroid-Oriented Composite Interval to improve the soundness problem. Arithmetic operations and equivalence classes were composed using this definition. Qualitative simulation results were compared to Kuipers's results and the improvements in the soundness problem is verified.

• Journal of the Korean GEO-environmental Society
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• v.9 no.7
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• pp.61-71
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• 2008

This study investigates the lateral resistance of micro-pile system when surcharge load is acting on the back of retaining wall. Both laboratory experiments and numerical analysis were performed. The experimental retaining wall model was developed on the laboratory-sized foundation. While surcharge load was acting, the interval and length varied as experimental variables. From the investigation it is known that the micro-pile system can effectively control the lateral displacement which is developed on the precast retaining wall. The effectiveness became increased as the pile interval reduced and the length of pile increased. The greatest reinforcing efficiency was shown when the pile length was 0.5H and the interval was 7D.

• Fire Science and Engineering
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• v.30 no.4
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• pp.128-134
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• 2016

The ambulance service time interval, in particular the response time, has been used as an important indicator for the quality control of ambulance services in that it can be improved to increase the probability of survival and decrease the sequela-related disability. Based on the 2011~2014 Prehospital Care Reports in a metropolitan city, this study analyzed the time interval of ambulance services considering the patient's characteristics and chief complaints. If the definition of the time of ambulance services can be refined further, and a variety of economic and social factors and local characteristics would can be analyzed, the quality of the ambulance service is expected to be enhanced significantly.

• Journal of Aquaculture
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• v.13 no.2
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• pp.181-186
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• 2000

Relationship between hsp 70 expression and development of thermotolerance in the olive flounder was investigated by exposing the fish to 23 or 26$^{\circ}C$ for 1 h. After selected intervals, they were re-exposed to 31$^{\circ}C$ for a duration of 15 min. Theremotolerance rapidly developed with increasing interval and peaked at 3 h interval. Subsequently, it gradually decayed and disappeared by 24 h interval. The flounder displayed remarkably high levels of hsp 70 mRNA and protein, as compared to control flounder. Hence, the olive flounder acquires thermotolerance, which is positively correlated with the synthesis of hsp 70.

• Journal of Biosystems Engineering
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• v.17 no.3
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• pp.213-222
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• 1992

To develop the wireless remote opreating system of walking rice transplanter, this study was carried out for manufacturing the wireless remote control system acting upon the transplanter. The first report of this study contained about the construction and operating method of a developed remote control system for 2-row walking type transplanter. It is the second report about the field test for an experimental transplanter being attached a wireless control system and for a conventional transplanter. The test was executed to investigate the characteristics of velocity, rectilinearity, turning time, interval of roots and of rows, and field capacity in accordance with various engine speeds for an experimental transplanter. The measurements of this test were compared with those of the conventional transplanter. The obtained results were as follows : 1. The operating velocity of the experimental transplanter was faster than the conventional one when the high speed range of the engine but the variances were very large. 2. The rectilinearity, interval of raws and of roots, and the turning time of the experimental transplanter was inferior to the conventional one at some speed ranges of the engine. 3. Field capacity of the experimental transplanter was superior to the conventional one at high speed of the engine. 4. There were some disadvantages for the experimental transplanter to operate, because it was constructed without any aid devices, such as float and hydraulic system for instance. But if the remote control system of this study equip at the modern walking transplanter, it will be improved and utilized without defects which was revealed from this test.

• Research in Plant Disease
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• v.13 no.3
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• pp.197-203
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• 2007

An isolate of Ampelomyces quisqualis 94013(AQ94013) was selected as an effective parasite for biological control of cucumber powdery mildew. In the greenhouse, occurrence of cucumber powdery mildew was significantly suppressed for nine days by pre-treatment with $5.0{\times}10^6/ml$ and $5.0{\times}10^7/ml$ of conidial suspension of AQ94013. The disease was effectively controlled within three to seven days by post-treatment with the $5.0{\times}10^6/ml-conidial$ suspension of AQ94013. When AQ94013 was treated at concentration of $5{\times}10^6/ml$ three times at seven-day interval in the vinylhouse, the control effect was higher than that treated twice at ten-day interval and that treated with fenarimol twice. As the results, Ampelomyces quisqualis 94013 could be a prospective biofungicide for biological control of powdery mildew of cucumber.

• Journal of the Ergonomics Society of Korea
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• v.32 no.3
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• pp.267-271
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• 2013

Objective: The purpose of this study is to examine the test-retest reliability of paper-pencil test for investigating population stereotype of burner-control linkages of four-stove gas ranges. Background: Much of the research on gas-range stereotype strength has been performed using the paper-pencil test. While the use of the paper-pencil tests has the advantage of collecting data in a large group of subjects against reasonable costs, concerns regarding the reliability of the paper-pencil test has also been stated. Method: Three paper-pencil tests classified by intervals of test-retest were performed, in which eight types of burner-control arrangements were investigated. Sixty eight subjects were test-retested within two weeks, 85 subjects were test-retested within four weeks and 58 subjects were test-retested three times in series with interval of two and four weeks. Results: Chi-square test showed that three intervals of test-retest including two, four and two & four weeks have not statistically significant effect on subjects' responses irrespective of eight types of burner-control linkages dealt with in this study(p>0.10). Concordance rates of subjects' responses ranged between 73.5% and 100.0% for two-week test-retest, between 67.1% and 97.6% for four-week test-retest, and between 65.5% and 100.0% for two- and four-week serial test-retest. The concordance rates were linearly correlated with proportion of subjects' responses for stereotypes of burnercontrol linkages. Conclusion: It is concluded that the paper-pencil tests for investigating gas range relevant stereotypes could reproduce reliable results compared to baseline test within interval of four weeks. Application: The results of this study would be useful as an ergonomic guideline when designing the paper-pencil tests for stereotype relevant studies.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.17 no.2
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• pp.72-80
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• 2004

Background and Objectives: Recently the incidence of allergic rhinitis has increased but treatment in most cases has only dealt with the symptoms. Medicine has been developed that shows fewer side effects. However, some side effects and the psychological stress over taking medicine have remained. There have been no studies so far performed on the effect of Lizhongtang plus Baidusan Extract. This study aimed to find out the therapeutic effects of its exclusive use in rats with Allergic Rhinitis. Materials and Methods : Thirty Sprague-Dawley rats were divided into three groups: the control group, the cetirizine HCI group and the sample group. To induce allergic rhinitis in the control group, the cetirizine HCI group and the sample group, rats were sensitized intraperitoneally with 0.1$\%$ ovalumin solution 3 times at an interval of I week. Then intranasal sensitization was performed by diffusing 0.1$\%$ ovalumin solution 3 times at an interval of 2 days. After that time, rats of the cetirizine HCI group were orally administered with cetirizine HCI. Rats of the sample group were treated with Lizhongtang plus Baidusan Ex. for 28 days. We observed changes in nasal mucosa and submucosa. Also we found changes in the segment of neutrophil and lympocyte in Leukocyte. We used the statistical methods of ANOVA test(p 〈0.05). Results: The loss of the cilium and the secretion of mucus in the treated group was rare when compared to control group. Effects of Lizhongtang plus Baidusan Ex. on the liver function were also studied in rats. Treatment of Lizhongtang plus Baidusan Ex. did not affect AST and ALT. The segment of neutrophil was significantly increased in the treated group when compared with the control group and the cetirizine HCI group(p 〈0.05). The segment of lympocyte was significantly decreased in the treated group when compared with the control group and the cetirizine HCI group(p 〈0.05). Conclusion: This study shows that Lizhongtang plus Baidusan Ex. decreases the inflammatory response in rats with Allergic Rhinitis.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.633-636
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• 1986

We have developed an automated ECG interpretation technique by micro-computer for rapid analysis of ECG data in the clinical hospital. This system is consisted of 16 bit microcomputer including bandpass-filter, comparator, A/D converter in order to obtain the QRS width, R-R interval.