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박경섭,김도태 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
In this paper, a controller design procedure for an electro-hydraulic positioning systems have developed using H_(∞) control theory. The generalized models and weighting functions for a multiplicative uncertainty modelling error is presented along with H_(∞) controller designs in order to investigate the robust stability and performance. The multiplicative uncertainty case is specifically suited for the design of an electro-hydraulic positioning control systems using H_(∞) control.
아공정 Al-Si 합금에서 Si 함량과 냉각속도에 따른 제이차수지상간격의 변화
박경섭,김희수,Park, Kyeong-Seob,Kim, Hee-Soo 한국주조공학회 2017 한국주조공학회지 Vol.37 No.4
In this study, we investigated the effect of the Si content on the secondary dendrite arm spacing (SDAS) of hypoeutectic Al-Si binary alloys in the range of 4~10 wt% Si. Cooling curves were measured during the solidification of the alloy cast in a step-wise mold. We compared two kinds of solidification time: the first is the total solidification time for both dendritic and eutectic growth, and the second is the solidification time for only dendritic growth. The proportional constant in the relationship between SDAS and cooling rate was estimated, as this constant represents the stability of the cast microstructure. The proportional constant decreased with the Si contents from 4 wt% to 8 wt%, and it remains relatively uniform with up to 10 wt% of Si.
박경섭 대한전기학회 1992 전기의 세계 Vol.41 No.5
지난해부터 한국의 경제 특히 무역적자가 자체적으로 가능화되면서, 그 원인과 책임문제가 매스콤에 보도되고 마침내 노사문제와 더불어 기술이 그 주범으로 지적되어 비로소 기술의 중요성을 모두가 인식하기 시작하게 된것은 서글프면서도 다행하다고 생각된다. 오늘날 우리의 현실을 생각하면 지금부터라도 우리의 살길은 기술개발, 나아가서 자립 없이 우리의 현재는 물론 미래도 영원히 해결될 수 없으며, 상대적으로 우리는 후퇴할 수 밖에 없다고 예견된다.
박경섭 울산대학교 1994 공학연구논문집 Vol.25 No.2
자동으로 공통모드 보상이 가능한 광섬유 센서 시스템을 구현하였다. 시스템은 변형된 마크-젠더 간섭게, 신호처리 및 데이터 획듣회로, 위상조절회로 그리고 공통모드 보상을 수해하는 알고리즘이 내장된 PC로 구성된다. 제안된 간섭계에서는 감지회로와 보상회로로 구성되어 감지회로에서는 우리가 원하는 물리제량을 측정하고 보상회로는 공통모드 보상이 가능하도록 하는 회로이다. 감지회로의 초기 위상이 결정되면 PC에서는 공통모드 보상이 가능한 동작점을 결정하여 그 값을 보상회로의 위상조절회로에 인가하여 공통모드 보상이 가능하게 된다. 모든 실험결과는 이론치와 일치하였다. We implemented an optical fiber sensor system which can achieve common mode compensation automatically. The system consists of modified Mach-Zehnder Interferometer, signal processing and data acquisition circuit phase modulator and personal computer that provide an algorithm for common mode compensation. The modified interferometer consists of sensing circuit and compensating circuit. The sensing circuit measured the measurand and the compensating circuit provide common mode compensation with phase modulator. All experimental results agree with those expected.
Application of plasma lighting for growth and flowering of tomato plants
박경섭,김성겸,이상규,이희주,권준국 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.6
Plasma lighting systems have been engineered to simulate sunlight. The objective of this study was to determine the eff ectsof plasma lighting on tomato plant growth, photosynthetic characteristics, fl owering rate, and physiological disorders. Tomato plants were grown in growth chambers at air temperatures of 25/23 °C (light/dark period), in a 16 h day −1 lightperiod provided by four diff erent light sources: 1 kW and 700 W sulfur plasma lights (1 SPL and 0.7 SPL), 1 kW indiumbromide plasma light, and 700 W high pressure sodium lamp (0.7 HPS) as a control. The total dry weight and leaf area at 0.7 SPL were approximately 1.2 and 1.3 times greater, respectively, than that of 0.7 HPS at the 62 days after sowing (DAS). The maximum light assimilation rate was observed at 1 SPL at the 73 DAS. In addition, the light compensation and saturationpoints of the plants treated with plasma lighting were 98.5% higher compared with HPS. Those differences appearedto be related to more efficient light interception, provided by the SPL spectrum. The percentage of flowering at 0.7 SPLwas 30.5%, which was higher than that at 0.7 HPS; however, there were some instances of severe blossom end rot. Resultsindicate that plasma lighting promotes tomato growth, fl owering, and photosynthesis. Therefore, a plasma lighting systemmay be a valuable supplemental light source in a greenhouse or plant factory.