• 제어로봇시스템학회논문지
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• 제4권5호
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• pp.666-673
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• 1998

To increase reliability and performance of an IMS(Intelligent Manufacturing System), fault tolerant control based on an accurate fault diagnosis is needed. In this paper, robot FDI(fault detection and identification) is proposed for IMS where the robot is controlled with state estimates of a nonlinear filter using a mathematical robot model. The Chi-square test and GLR(General likelihood ratio) test are applied for fault detection and fault size is estimated by a proposed bias filter. Performance of the proposed algorithm is tested by simulation for studies.

• 품질경영학회지
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• 제16권1호
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• pp.32-42
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• 1988

The general n/m job-shop problem is easy to state what is required, but it is extremely difficult to make any progress whatever toward a solution. This paper was first to examine a heuristic procedure of general n/m scheduling generation focused on the procedure of MWRK (Most Work Remaining) presented by Giffler and Thompson (1960) among others. Then modified procedure was proposed to obtain better solution in light of the key measure of performance compared with that of the literature presented by Baker (1974). The modified procedure then has been extended to other example problem to test the better results and to assure the properness of application.

• 대한방사선기술학회지:방사선기술과학
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• 제16권2호
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• pp.73-79
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• 1993

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2202-2203
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• 2011

AC substation of urban transit supplies a suitable AC power on electricity vehicles. AC substation is verified electrical safety of system through pre-operation inspection on electrical installations to be supplied power from KEPCO. However, because test items and method for AC traction system are unprepared on pre-operation inspection, the general safety and performance verification of AC traction system are very insufficient. Therefore this paper analyze the test examples such as factory equipment tests, factory combined tests and railway tests for the safety and performance verification of AC traction system and present a suitable test items and test standard in domestic.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.499-504
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• 2008

DC substation of urban transit supplies a suitable DC power on electricity vehicles by being supplied from KEPCO. DC substation is verified electrical safety of system through pre-operation inspection on electrical installations to be supplied power from KEPCO. However, because test items and method for DC traction system are unprepared on pre-operation inspection, the general safety and performance verification of DC traction system are very insufficient. Therefore this paper analyze the overseas test examples such as factory equipment tests, factory combined tests and railway tests for the safety and performance verification of DC traction system and present a suitable test items and test standard in domestic.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.333-336
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• 2004

This paper presents performance of the impact hammer drill with coefficient of restitution, lubrication and friction, pressure leakage, damper efficiency and the general quality test. The novel measurement systems are introduced in order to get the reasonable data. The mechanism of strikers with inner pressure is revealed in the general quality test. Due to these factors we are able to make the computational analysis correctly.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.445-447
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• 2016

SQLite, Realm 등은 리소스 제약이 큰 소형 기기에 적합한 데이터베이스 엔진들이며 리눅스 기반 모바일 기기에 많이 사용되고 있다. 이 엔진들은 대부분 오픈소스 프로그램들이며 범용 데이터베이스에 비해 가볍고 속도가 빠른 장점을 지닌다. 이 논문에서는 리눅스 기반 환경에서 SQLite 데이터베이스의 검색 성능을 파악하기 위한 테스트 프로그램을 구현하고 성능 실험을 실시한다. 실험은 같은 환경에서 실행되는 Oracle 데이터베이스와 비교하여 진행한다.

• 한국도로학회논문집
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• 제18권6호
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• pp.145-152
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• 2016

OBJECTIVES : Visibility at night can be improved by using retroreflection for short distances and phosphorescent line markings for long distances. In this study, we analyzed the characteristics of the phosphorescent line marking through a laboratory luminance test. Field performance analysis was performed through tests conducted on the road. We also examined the luminance measurement methods using the digital image obtained during the phosphorescent visibility evaluation. METHODS : In this study, the laboratory luminance test of the phosphorescent line marking was conducted using seven specimens to characterize the luminance changes according to the type of the glass beads, the thickness of the phosphorescent line marking, and the brightness and irradiation time of the light source. Phosphorescent and general line markings were made at 150 m to investigate the field luminance performance. A preliminary review of the luminance measurement methods was made using a digital image from a digital single-lens reflex (DSLR) camera. The measured luminance ratio of the general and the phosphorescent line markings was compared with the calculated luminance ratio using luminance analysis. RESULTS : Through the laboratory luminance test, it was seen that the change in luminance, which corresponds to the brightness of the light source, appears large but the influence of the thickness and irradiation time is low. The field performance test of the phosphorescent line marking conducted on the road involved measuring the luminance on the day the marking was made and 7 days after the marking was made. The luminance was found to be $190mcd/m^2$ at 30 min after sunset and approximately $10-12mcd/m^2$ 4h after sunset. The results of the luminance test were captured using a digital image for each time group. The luminance ratio of the phosphorescent line marking, when compared to that of the general line marking, showed a similar trend within a 13% maximum error. Additionally, when this luminance ratio is compared to the direct field measurement, it could be confirmed that the luminance ratio, as captured in the digital image, showed a similar tendency. CONCLUSIONS : 1) The change in luminance corresponding to the brightness of the light source is significant in comparison with that corresponding to the thickness and the irradiation time. In addition, the results of the field test for the phosphorescent line marking satisfied the phosphorescent fire protection standard. 2) We examined the validity of the luminance measurement method using a digital image and we concluded that the change in the luminance ratio shows a similar tendency in both the cases. The results can form the basis for luminance measurement methodology for the construction and maintenance of phosphorescent line markings.

• The Journal of Korean Physical Therapy
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• 제26권1호
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• pp.15-20
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• 2014

Purpose: We investigate to evaluate the effects of scapular stabilization exercise on dynamic standing balance in stroke patients. Methods: Thirty hemiplegic patients participated was divided into control group and training group randomly. Control group(n=15) had only general rehabilitation training and training group (n=15) had both the general rehabilitation training and intensive scapular stabilization exercise. They were treated for 15minute/5 times/4 week. We measured PALM (palpation meter) to measure affected side's distances from spine to scapular. We measured FRT (functional reach test), FSST (four squared step test), and BPM (balance performance monitering) to evaluate dynamic standing balance. Results: Training group showed a significant difference in the distances from spine to scapular, FRT, FSST, and variables of BPM comparing control group (p<0.05). But control group was not significant difference. Conclusion: These results suggest that scapular stabilization exercises have positive effects on dynamic standing position.

• 한국전문물리치료학회지
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• 제18권2호
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• pp.9-17
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• 2011

The objective of this research was to examine the effects of lumber stabilization exercise and a general physiotherapy program for caregivers with chronic low back pain. Sixteen people participated in this study and were randomly assigned to two groups for either lumbar stabilization exercise or for general physiotherapy, respectively. The experiment was performed for eight weeks. To examine the general as well as the medical characteristics of the participants, the following measurements were used: Visual Analogue Scale (VAS); Oswestry Disability Index (ODI); Back Performance Scale (BPS); Roland - Morris Disability Questionnaire (RMDQ); and Beck Depression Index (BDI). To compare the general and medical characteristics of the participants in the two groups, an independent t test were used. During the experiment, a paired t test was conducted to determine whether there was a significant difference in the values of VAS, ODI, BPS, RMDQ, and BDI before and after the experiment. To examine the difference in the VAS, ODI, BPS, RMDQ, and BDI values in the two groups, ANCOVA was used with pre test values as a covariate. According to the test results, in the lumbar stabilization exercise group, the VAS, ODI, BPS, RMDQ, and BDI values showed a statistically significant difference before and after the test (p<.05). In comparison, in the general physiotherapy program group, only the ODI and BPS values showed a statistically significant level of improvement. Regarding the degree of improvement, participants in the lumbar stabilization exercise group showed statistically significant progress compared to those in the general physiotherapy group. In summary, lumbar stabilization exercise is regarded as more effective than general physiotherapy for treating caregivers with chronic low back pain. In future studies, it will be useful to expand the research and to examine the long term effects of lumbar stabilization exercise on workers.