淨水場 單位工程의 最適化 自動制御 시스템에 관한 硏究

김성순,문교영,김갑진 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

본 연구는 상수도 공급의 합리적 방안 연구의 일환으로서 수질개선과 효율적인 공급관리 체계확립을 연구하였다. 먼저 상수도 체계도를 각각 단계별로 분류하였으며, 정수장의 수처리 공정에서 발생하는 근원적인 문제점과 실태를 조사ㆍ분석하여 개선책과 대안들을 제시하고자 하였다. 또한 상수도 관리공정의 자동화 및 계측제어 system 방식의 도입을 통하여 비효율적인 기존의 인위적 생산방식을 탈피하고, 제한된 용수자원을 최대한 호라용하여 능률적인 상수원 공급체계를 확립하고자 하였다. Water Supply in Water Treatment Plants has been accomplished at a great extent for last decade in Anyang City. Some problems to be solved were disclosed in the survey which dealt with operation and the installation procedure. Optimum Auto-Control System is a kind of preventive maintenance equipment which monitors continuously the operating condition of equipment and alarms to the operator in case of abnormal condition to prevent equipment from transition to big trouble. This system monitoring the efficiency of water treatment plants. By suggesting standard model of Optimizing Control System after completion, it will be possible to adapt this model to the renewaland/or new construction of other Water Supply System. Also it will contribute to the effective equipment operation by maintenancing cost cut-down and remote monitoring and control.

모델 추종형 적응 퍼지 제어기의 설계

남문현,김낙교,손재현 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-

In this paper, reference-model following fuzzy controller (RMFFC) was proposed in order to overcome the difficulty of extracting rules and defects of the adaptation performance in the FLC. RMFFC comprised inner feedback loop consisting of the FLC and plant, and outer loop consisting of adaptation mechanism which of the FLC. A Referenced-model was used for design criteria of a fuzzy controller which characterizes and quantizes the control performance required in the overall control system. Tuning control rules of FLC is performed by the adaptation mechanism. For this, the fuzzy model for tuning the control rules is designed in accordance with the feature of error information. Proposed algorithm was verified through simulation for various plant models which have different characteristics. And the results are obtained as follows. 1) Control performance required by a skilled operator was reflected to the control. 2) Unnecessary rule modification did not occur in steady-state, after completion of learning, by using the following error information 3) Performance of RMFFC was improved in various disturbances, comparing with conventional FLC and MRAC.

자기회귀 모델을 이용한 팔운동 근전신호의 기능분리

南文鉉,金正鉉,金洛敎 建國大學校 附設 産業技術硏究所 1992 논문집 Vol.17 No.-

본 연구에서는 AR 모델을 이용한 인간의 팔운동 근전신호의 기능분리에 관한 방법을 제시하였다. 4가지 기능의 팔운동 시에 근전신호의 특성을 잘 나타낼수 있는 매개변수를 공분산범과 연속적 최소제곱 알고리즘을 이용하여 각 기능에 대한 모델의 매개변수와 적정차수를 결정하였다. 또한 팔 기능을 분류하기 위한 신뢰구간은 총합제곱오차의 평균과 표준차로 결정하였다. AR 모델의 오차를 이용하여 각 운동에 대한 기능분리를 실행한 결과 차수가 4차일 때 가장 높은 인식률을 얻을 수 있었으며, 차수가 증가할수록 인식률은 감소하였다. 따라서 본 연구의 결과는 의용생체공학이나 재활공학에 응용할 수 있으리라 기대한다. In this thesis, general method using autoregressive model in the functional separation of the myoelectric signal of human arm movements are suggested. Covariance method and sequential least squares algorithm were used to determine the model parameters and the order of signal model to describe four arm movement patterns; the forearm flexion and extension, the wrist pronation and supination. The confidence interval to classify the functions of arm movement was defined by the mean and standard deviation of total squares error. With the error signals of autoregressive(AR) model, the result showed that the highest success tate was obtained in the case of 4th order, and success rate was decreased with increase of order. This technique might be applied to biomedical-and rehabilitation-engineering.

수용액에서 γ형 알루미나 표면에 대한 니켈이온(Ⅱ)의 흡착특성

홍교민,김문선,정재관 한국공업화학회 2003 공업화학 Vol.14 No.3

γ형 알루미나의 흡착특성을 구명하기 위하여 본 실험에서는 수용액에서 γ형 알루미나를 흡착제로 이용하여 온도와 pH가 니켈이온(Ⅱ)의 흡착능에 미치는 영향을 관찰하고 알루미나 표면과 니켈이온(Ⅱ) 간의 Langmuir와 Freundlich 흡착등온식과 Lagergren 흡착속도식을 결정했다. 5 g Al_2O_3/L의 조건에서 니켈이온은 10 h에 흡착평형상태에 도달했다. PH 2~6의 범위에서 pH가 증가할 때 흡착량은 급격히 증가하다가 PH 6에서 최대 흡착량을 나타냈으며 pH 6~9의 범위에서는 pH가 증가하여도 흡착량은 일정했다. 온도 20℃에서는 흡착량이 적었으나 30℃에서 급격히 흡착량이 증가하였으며 30~50 ℃의 범위에서는 온도 증가에 따라 흡착량이 완만하게 증가했다. Freundlich 흡착등온식의 결정계수는 0.9489로 Langmuir식의 0.9265보다 높았으며 Lagersen 흡착속도식에서의 k_ad값은 0.0023 h^-1으로 결정계수는 0.9497이였다. In this paper, Langmuir and Freundlich adsorption isotherms, and Lagergen adsorption rate were determined and the effect of temperature and pH on the adsorptivity of Ni(Ⅱ) ions were investigated in order t() stud)'the adsorption characteristics of γ-type alumina. For 5 g Al_2O_3/L, the adsorption equilibrium was obtained in 10 h. The adsorption amount increased rapidly when pH incrteased from 2 to 6, and the maximum adsorption amount was observed at pH 6. For pH 6 to 9, however, the adsorption amount remained constant. The adsorption amount was low at 20℃. However, The adsorption amount increased with increased in temperature; the amount increased rapidly at 30℃ and increased linearly with temperature from 30 to 50℃. The correlation coefficient (R_2) for Freundlich adsorption isotherm was 039489%, and this was higher than that for Langmuir adsorption isotherm of 0.9268%. The adsorption coefficient (k_ad) of lagergen equation was 0.0023h^-1, and the correlation coefficient (R^2) was 0.9497.

AM 放送의 指向性 안테나의 特性에 關한 硏究

李門浩,김종교 全北大學校 1981 論文集 Vol.23 No.-

The field radiated by any small linear antenna (=nondirectional antenna) is distributed uniformly. This type of radiated pattern is desirable for many broadcasting applications, but it is undesirable for point-to point and preferred coverage applications. The field strength can be increased in selected directions by appropriately exciting several antennas simultaneously. That is applications in which it is desired to radiate most of the energy in one direction, for example toward population city.

Supercritical Nano-Plating 시스템에서 전기도금된 니켈 막의 표면특성에 관한 연구

홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.2

In this study, experiments of a nickel electroplating were performed in a supercritical nano-plating(SCNP) system using CO₂as a supercritical fluid. Surface properties of nickel film electroplated by the electrolyte solution with 0.2 vol% surfactant and volume ratio of CO₂and electrolyte as 1:9 was the best in the plating properties, where surface roughness(Ra) of nickel film plated for 30 min by SCNP was 0.021 ㎛. The property of plated film with this new method was better than that by a conventional method.

20세기 한국의 농업기상재해 특징

심교문,이정택,이양수,김건엽 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.4

Recently, both climate change and unusual meteorological disasters are becoming a more frequent and serious threat to agricultural production. Destruction of the stabilizing base of agricultural productivity in Korea is a concern. This study provides basic information for stabilizing agricultural production by clarifying and analyzing the features of agro-meteorological disasters which have occurred recently in Korea. The occurrence of meteorological disasters has increased rapidly since the 1940s. A 19-fold increase in occurrence is noted over the past 60 years from 1941 to 2000. Meteorological disasters occurred mostly in August, then in July, and least often in October. In terms of regional occurrences, the frequency of meteorological disasters was the highest in Gangwon (751 times) and in Jeonnam (703 times) provinces, and the lowest in Jeju (459 times) province for the 97 years from 1904 to 2000. Agro-meteorological disasters which caused the most serious damage to cropland were rain storms and typhoons for the 10 years from 1991 to 2000, and they occurred 52 and 18 times during this period, respectively. Agro-meteorological disasters occurred mainly during the summer season (from June to September) when major crops are cultivated in Korea.

CO_2 초임계 유체/전도성 에멀젼용액을 이용한 구리판에 대한 니켈 나노도금에 관한 연구

홍교민,홍성철,김문선,정재관 한국공업화학회 2002 응용화학 Vol.6 No.2

In this study, experiments of a nickel elecroplating were performed by a conductive emulsion solution of CO_2/electrolyte/surfactant/entrainer in the supercritical nanoplating system to investigate the effect of the resistivity on plating properties. Resistivity values decreased 60, 35, and 22 Ω at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20 Ω. Surface properties of nickel film electroplated by the emulsion solution with 60 wt% electrolyte at 8 MPa was better than that at atmospheric pressure.

Supercritical nano-plating 시스템에서 전해질/계면활성제 조성이 니켈 전기도금에 미치는 영향에 관한 연구

홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.1

In this study, experiments of a nikel elecroplating were performed in a supercritical nano-plating system using CO_2 as a supercritical fluid. Electrolyte and surfactant were important parameters on the nickel plating proces. Resistivity values decreased 60, 35, and 22 at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20. Surface properties of nickel film electroplated by the 60 wt% electrolyte solution with 2 wt% surfactant. The weight ratio of CO_2 and electrolyte as 1:9 was better then any other ratio in the plating properties.

컴퓨터 시뮬레이션에 의한 밀링머시인의 精密度解析에 關한 硏究

李起卨,金敎亨,文鍾石 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1

Relationship between geometric errors which are due to X,Y,Z axis motion in milling machine and workpiece error is analyzed and the Simulation program that can forecast volumetric error in the working space of machine tool is developed. If the simulation program in this study is utilized, the volumetric error can be compensated in working space of machine tool because volumetric error can be forecasted in advance of machining by this simulation program. It is considered that the simulation program developed in this study can be applied to numerical control to improve workpiece accuracy.