• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1991년도 추계학술대회
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• pp.66-69
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• 1991

This paper describes a design of transducer for non-invasively detecting pressure radial pulse wave in aterial system and a recording system that for the studing the aterial pulse diagnosis of korean traditional medicine. The mechanism of transducer is composed of sensing mechanism, pressure sensor, conditioning amplifier. The variation of radial pulse pressure in the sensing mechanism is converted to the electric signal by piezo-resistive pressure sensor and it converted to the digital signal after preprocessing via A/D converter. The converted signals inputed to the computer as data files and then it display to the monitor for waveform watching and this datas can be used as the aterial pulse diagnosis data. This system effectively detect non-differential radial pulse wave and we conside that if analizing the recorded radial pulse wave, compared each other, it can be helpful in quantify radial pulse wave diagonosis of the Korean traditional medicine.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 추계학술대회
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• pp.182-195
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• 2000

Indigenous bacteria from poplar roots (Populus mnadensis var. eugenei, 'Imperial Carolina') and Southern Californian shrub rhizospheres as well as two tree-colonizing Rhizobium strains (ATCC 10320 and 35645) were genetically engineered to express constitutively and stably toluene o-monooxygenase (TOM) from Burkholderia cepacia G4 by integrating the torn locus into the chromosome. The poplar and Rhizobium recombinants degraded trichloroethylene (TCE) at 0.8-2.1 nmol/min.mg protein (initial TCE concentration, 10u M) and competitive against the unengineered hosts in wheat and barley rhizospheres for one month (colonization at 1-23 $\times$ 10$^{5}$ CFU/cm root). In addition, six of these recombinants colonized poplar roots stably and competitively with populations as high as 79 $\pm$ 12% of all rhizosphere bacteria after 28 days (0.2-31 $\times$ 10$^{5}$ CFU/cm root). Furthermore, five of the most-competitive poplar recombinants (e.g., Pb3-1 and Pb5-1 which were identified as Pseudomonas PsK) retained the ability to express TOM for 29 days as 100 $\pm$ 0% of the recombinants detected in the poplar rhizosphere had constitutive expression of TOM.

• 대한수의학회지
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• 제36권1호
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• pp.51-56
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• 1996

Clinical findings of white muscle disease or dystrophia were reported in Hokkaido horses from 1960. This disease was caused by selenium and $\alpha$-tocopherol deficiency. Therefore, this study were conducted to measure serum selenium and $\alpha$-tocopherol levels in Cheju island horses using feedstuffs containing volcanic ashes. The results were as follows : 1. The mean values of serum total selenium and $\alpha$-tocophcrol were $91.90{\pm}49.18ppb$(13.20ppb-193.80ppb) and $0.345{\pm}0.253mg/dl$(0.056mg/dl-1.159mg/dl) in female respectively. There were no significant relation between serum total selenium and $\alpha$-tocopherol levels. 2. 22%(15 of 68) of the horse examined showed selenium levels below 50ppb. 11.8%(8 of 68) showed $\alpha$-tocopherol levels lower than 0.10mg/dl. These results could be useful to diagnose of white muscle disease of Cheju island foals and quality control of feedstuffs of pregnant mares.

• 혜화의학회지
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• 제10권1호
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• pp.109-114
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• 2001

To evaluate the antitumor activity of Paridis Rhizoma(PR), studies were done experimentally. The results were obtained as follows: 1. In cytotoxicity against MCF-7, SK-OV-3, HCT15, concentration inhibiting cell growth up to below 50% of control was recognized at $100-200{\mu}g/m{\ell}$ of PR and also against A549, XF498 was recognized at $50-100{\mu}g/m{\ell}$. 2. In Inhibitory effect on activity of DNA topoisomerase I, the $IC_{50}$ was shown $50-100{\mu}g/m{\ell}$ of PR. 3. The concentration inhibiting adhesion of A549 and SK-OV-3 to complex extracellular matrix up to below 50% of control was recognized at $10-100{\mu}g/m{\ell}$ of PR. 4. The T/C% was 137.9 in PR-treated group in S-180 bearing ICR mice. From above results it was concluded that PR could be usefully applied for the prevention and treatment of cancer.

• 한국물환경학회지
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• 제28권5호
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• pp.663-668
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• 2012

The feasibility of enhancing biological nutrient removal from an industrial wastewater was tested with food waste leachate and sugar liquid waste as external carbon sources. Long term influences of adding external carbon sources were investigated to see how the biological nutrient removal process worked in terms of the removal efficiency. The addition of the external carbons led to a significant improvement in the removal efficiency of nutrients: from 49% to approximately 76% for nitrogen and from 64% to around 80% for phosphorus. Approximately, 20% of the removal nitrogen was synthesized into biomass, while the remaining 80% was denitrified. Though the addition of external carbon sources improved nutrient removal, it also increased the waste sludge production substantially. The optimal observed BOD/TN ratio, based on nitrogen removal and sludge production, was around 4.0 in this study.

• 한국농공학회논문집
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• 제56권5호
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• pp.29-36
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• 2014

The purpose of this study is to improve the Generic Agricultural Systems Simulator (GASS) which can simulate various rural systems based on object-oriented model. GASS provides the configuration platform of various system components to simplify integrated agricultural system models such as irrigation systems for rice farming. The new connection and communication modules of GASS improve applicability for modelling diverse systems. The geometric connection of GASS replaces topological connection, and communication protocols expand to analyze not only homogeneous system but also heterogeneous system. In this paper, we applied GASS2 to simulate the water heights of linked tanks and the simulation outputs were verified through comparing with analytical solutions of differential equations. The two new modules make it possible to analyze the 4-tank problem which includes topological and heterogenous issues with GASS2.

• 제어로봇시스템학회논문지
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• 제17권4호
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• pp.289-294
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• 2011

Digital redesign is yet another efficient tool to convert a pre-designed analog controller into a sampled-data one to maintain the analog closed-loop performance in the sense of state matching. A rising difficulty in developing a digital redesign technique for trackers with time-varying references is the unavailability of a closed-form discrete-time model of a system, even if it is linear time-invariant. A way to resolve this is to approximate the time-varying reference as a piecewise constant one, which deteriorates the state matching performance. Another remedy may be to decrease a sampling period, which however could numerically destabilize the optimization-based digital redesign condition. In this paper, we develop a digital redesign condition for time-varying trackers by approximating the time-varying reference through a triangular hold and by introducing delta-operated discrete-time models. It is shown that the digitally redesigned sampled-data tracker recovers the performance of the pre-designed analog tracker under a fast sampling limit. Simulation results on the formation flying of satellites convincingly show the effectiveness of the development.

• 한국지능시스템학회논문지
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• 제12권1호
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• pp.80-84
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• 2002

본 논문은 2자유도 실험용 헬리콥터 시스템의 제어를 위한 분산 제어기 설계 기법을 제안한다. 분산제어기법은 특히 대규모 제어 시스템에 적합하다고 알려져 있다. 본 논문에서는 Lyapunov 안정도 설계 방법을 이용하여 상호 연결된 TS 퍼지 시스템의 안정도 조건을 유도하고 선형 행렬 부등식을 이용하여 제어기 설계 조건을 공식화한다. 제안된 방법의 유용성을 검증하기 위해, 컴퓨터 시뮬레이션뿐 만 아니라 실험을 통해 그 결과를 도출한다.

• 한국지능시스템학회논문지
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• 제23권2호
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• pp.133-138
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• 2013

본 논문은 연속시간에서의 타카키-수게노 퍼지모델 기반 다개체 시스템의 상태일치를 위한 제어기 설계 기법을 제안한다. 그래프 이론을 통해 각 개체간의 정보를 교환하는 네트워크를 표현한다. 제어기 설계 조건은 선형 행렬 부등식의 형태로 유도되며, 수치적 예제를 통해 제안된 방법의 효율성을 증명한다.

• 한국지능시스템학회논문지
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• 제26권4호
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• pp.308-315
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• 2016

본 논문은 이산시간 장주기모델로 구성된 다개체시스템의 타카기-수게노(Takagi-Sugeno: T-S) 퍼지 군집제어 기법을 제안한다. 이산시간 모델은 오일러(Euler) 방법을 이용하여 유도한다. 이에 대한 T-S 퍼지 모델은 피드백 선형화 기법을 통해 구성하며, 이를 점근적으로 안정화하기 위한 퍼지제어기를 설계한다. 제어기 설계조건은 선형행렬부등식의 형태로 표현된다.