• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.295-299
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• 2004

본 논문에서는 주기 비안정 연속계의 해석을 위한 주파수 방법이 제안된다. 비안정시스템의 안정화를 위한 기존의 주파수 해석법을 일부 수정하여 연속계를 포함한 비안정 시스템에 적합하도록 수정하였으며, 직류모터와 동기발전기로 구성되어 있는 전기-기계 시스템에 적용하여 유용성을 보였다. 복잡한 비안정 연속계의 문제를 각 요소별 주파수 응답을 분리하고 조합하는 작업들을 통하여 쉽게 풀 수 있음을 보였다. 모터-발전기로 구성되어있는 전기-기계 시스템에서 발전기의 상호유도인덕턴스의 시간에 따른 주기적 변화와 장선(long electrical line)의 부하가 시스템의 불안정성을 야기함을 보였다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.11-12
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• 2015

본 논문은 LCL 필터를 사용하는 계통연계형 인버터의 안정적인 전류제어를 위한 공진주파수와 샘플링주파수의 관계 분석을 통해 주파수 및 이산시간영역에서 전류제어 안정도를 해석, 시뮬레이션 및 실험을 통해 검증하였다. 능동댐핑을 포함하지 않는 계통전류 제어의 경우, 공진주파수가 샘플링주파수의 1/6이 되는 $f_{base}$보다 높은 영역에 위치하면 안정, 낮은 영역에 위치하면 불안정한 특성을 분석하였고, 공진주파수 변화에 따른 전류제어루프의 안정도 해석을 기반으로 7kW 계통연계형 인버터 Psim 시뮬레이션 및 실험을 통해 동일한 결과를 도출함으로써 주파수간의 관계 분석 및 안정도 해석의 타당성을 검증하였다.

• Electric Engineers Magazine
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• v.229 no.9
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• pp.27-36
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• 2001

기존의 HID 램프용 안정기는 대부분이 인덕터와 콘덴서를 사용한 수동소자 회로이며 사용 전원 60HZ에서는 그 부피가 커짐은 물론 중량이 무거워 설치에 제약조건이 많고 효율이 나쁘기 때문에 전자식 안정기를 사용하여 단점을 보완할 필요가 있다.

• KOREAN POULTRY JOURNAL
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• v.18 no.10 s.204
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• pp.70-73
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• 1986

산업발전은 가격안정이 우선되어야 한다. 가격안정이 이루어지기 위해서는 생산자의 노력이 필요하며 그 방법은 수요와 공급의 조절이라 할 수 있다. 이에 본지는 정부의 양계산업안정화 방안중에서 발췌 게재한다.

• Food Industry
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• s.16
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• pp.21-24
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• 1973

우리나라 식품공업계는 그동안 안정된 가격선에서 각종 제품을 무제한 공급하므로써 국민식생환 개선, 국제수지개선, 물가안정 대책, 내자동원등으로 경제성장을 다각적으로 뒷바침 해나왔다. 그러나 지금은 원료확보, 제품가격현실화등 갖가지의 난제를 안고 있다.

• 월간낙농육우
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• v.17 no.10 s.186
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• pp.107-108
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• 1997

낙농산업의 안정적인 발전을 위하여는 집유체계의 일원화를 기하여 전체 낙농가가 참여 하는 계획생산과 전체 유가공 업체가 참여하는 수급체계를 안정화 함으로서 원유가격의 안정을 도모하고, 원유검사를 공영화 함으로서 유가공업체의 독단을 방지하여 낙농가의 안정적 수입을 보장하여야 할 것이라 하겠다.

• Journal of the Korean Geosynthetics Society
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• v.9 no.4
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• pp.17-25
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• 2010

Evaluation of stability in traditional designing of reinforced soil structures is executed by examination of internal and external stability. Analysis of internal stability is for pull-out and ductile strength. Analysis of external stability is for settlement, overturning and sliding. To minimize inherent uncertainties of soil properties and analytical model, reliability analysis was developed recently. In this study, reliability analysis method considering simultaneous failure probability for various failure mode of internal and external stability is proposed. By applying uni-modal bounds, Stability of system reliability of reinforced soil structures is evaluated by integrating multi failure mode for various analytical model. Because of complex consideration for various failure shapes and modes, it is possible to secure advanced safety by using simultaneous failure probability. And evaluation of reinforced soil structure is executed by representative index, simultaneous failure probability, than previous method.

• Journal of the Korean Geotechnical Society
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• v.31 no.1
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• pp.15-24
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• 2015

This paper presents the results of a reduced-scale physical model investigation into the effect of drilling fluid with different mix designs for bore hole collapse prevention. The bore hole collapse prevention mechanism for the bentonite based drilling fluid was first discussed together with the effect of conditioning with different additives on engineering characteristics of bentonite based drilling fluid. Reduced-scale model tests were then carried out considering field procedures for cases with a decomposed granitic soil with 20% fines and a sand with various drilling fluids with different mix designs. The results indicated that the addition of polymer to the bentonite based drilling fluid decreases the amount of drilling fluid injected, the drilling fluid infiltration thickness and increases the final depth of excavation. Also revealed is that the effect of polymer on the performance of drilling fluid is more pronounced in the decomposed granite soil with 20% fines than the sand. Practical implications of the findings from this study are discussed in great detail.

• Korean Journal of Agricultural Science
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• v.30 no.2
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• pp.164-174
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• 2003

This study was performed to suggest a rational method for the stability evaluation of agricultural reservoir in the very soft ground. The stability methods for agricultural reservoir was used to compare and analyze with various condition by limit equilibrium method. The behavior of settlement-displacement obtained by field monitoring system was used to compare and analyze with various stability methods, and to investigate the applicability of the methods for stability evaluation of agricultural reservoir. The horizontal displacement was abruptly increased when physical properties of soft clay reached its maximum values and therefore, the values of these properties could be used to the fundamental data for stability evaluation. The evaluation of the stability of agricultural reservoir was suggested to use the inclination of curve rather than critical line.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.158-162
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• 2008

Heart rate has many effect by environment factor and body factor and mind factor. Experimental testing decide to make relaxed condition. so It want to get correct data peoples different time and condition in the day so medical mans think relaxed to low Heart rate. but normal heart different from peoples and time. there was noting standard. so Heart rate is really hard to relaxed heart rate. Heart rate pattern must have long time analysis for good result. if you get relaxed heart rate so you don't need long-time analysis. Relaxed heart pattern used for guidance of auditory impulse public got concentration and solve to stress. it chose MC Square and mozart music. Two kind of auditory impulse analysis to make a relaxed Heart rate and relaxed pattern. way of analysis is HRV and minute of heart bit rate. result It have find Guidance to Relaxed Heart rate.