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폴리우레탄을 이용한 ISFET 요소센서의 제작 및 특성
최성문,손병기,김의락 ( Sung Moon Choi,Byung Ki Sohn,Ui Rak Kim ) 한국센서학회 1993 센서학회지 Vol.2 No.1
An ISFET urea sensor was fabricated by immobilizing the urease using polyurethane on the H^+ sensing Si₃N₄ thin film of pH-ISFET. The sensor could determine the urea concentration 1∼50 mg/dl with fast response of 3∼5 min. and good repeatability. For its application to clinical analysis, the results of the urea measurements in blood plasma using ISFET urea sensor were compared with these of conventional Urease-Indophenol method.
신재생에너지 출력제한 개선을 위한 VPL의 최적용량 산정방안에 관한 연구
최성문,김지명,김윤호,유현상,유경상,노대석 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.11
The installation of renewable energy sources is rapidly being increased according to the basic roadmap for national greenhouse gas reduction by 2030 and the 10th Basic Plan for Long-Term Electricity. However, power curtailment of renewable energy sources frequently has occurred due to the imbalance between the power supply and the demand. To solve these problems, an investment in power facility infrastructure is required, which has enormous cost and a long period of construction. Therefore, this paper presents the operation characteristics of a VPL to improve the power curtailment of renewable energy sources and avoid investment in the power system infrastructure. We propose a method to calculate the optimal capacity of ESS for a VPL. An estimation method of optimal capacity is the minimum capacities of ESS (kW and kWh) are estimated based on the active power required to maintain voltages within the allowable limits for customers. The modeling of a VPL-connected distribution system was performed, which is composed of distribution substations, a VPL, a PV system, customer loads, and an energy prosumer using PSCAD/EMTDC S/W. The simulation results confirmed that the customer voltages are maintained within the allowable voltage limit according to the operation characteristics of a VPL. Therefore, power curtailment of renewable energy sources can be improved economically without investment in power facility infrastructure.
최성문 인제대학교 1993 仁濟醫學 Vol.14 No.3
118명의 접촉피부염 환자에서 European standard series를 사용, 칩포시험을 시행하여 다음과 같은 성적을 얻었다. 1.MOHL index는 33.9-26.2-22.9-0이었다. 2.한개 이상의 항원에 양성 반응을 보인 환자는 80명(67.8%)으로, 남자 24명 (60.0%), 여자 56(71.8% )이었다. 3.양성율이 높은 항원은 cobalt chloride(25.4%), potassium dichromate(21.2%), nickel sulfate (21.2%), mercury ammonium chloride(13.6%), thimerosal(10.2%) 등의 순이었다. 4.남자는 고무 제품과 관련된 carba mix에, 여자는 nickel sulfate 등의 장신구 및 화장품과 관련된 항원에 상대적으로 높은 양성율을 보였다. 5.연령별로는 20대와 30대에서 nickel sulfate, cobalt chloride, potassium dichromate, mercury ammonium chloride 등에 높은 양성율을 보였으며, p-phenylenediamine은 대부분 50대 이후에서 양성 반응을 보였다. Between August 1989 and June 1992, a study on patch tests with European standard series was performed on 118 patients with contact dermatitis. The tapes employed were Finn Chamber on scanpor tapeR, and placed with the antigen on the back of the patients for 48 hours and read at 30 minutes and 48 hours following removal of the attached patches, in accordance with the method recommended by the International Contact Dermatitis Research Group(ICDRG). The results were as follows ; 1.The MOHL index was as 33.9-26.2-22.9-0 2.Eighty(67.8%) were positive to the patch test The positive incidence in male and female were 24(60.0%) and 56(71.8%), respectively. 3.The frequency of positive antigens in order were cobalt chloride(25.4%), potassium dichromate(21.2%), nickel Sulfate(21.2%) mercury ammonium chloride(13.6%), thimerosal(10.2%), and others(less than 10%). 4.Males showed a relatively high positive rate on carba mix associated with rubber ; whereas females showed a high positive rate on antigens associated with jewelry and cosmetics, for example nickel sulfate. 5.The high positive rate on nickel sulfate, cobalt chloride, potassium dichromate, and mercury ammonium chloride were found in the age group between 20 and 39. The positive incidence of p-phenylenediamine was found to be mostly higher after 50 years of age.
신경회로망을 이용한 오이 배양액의 배액내 이온농도 예측
최성문,최영수 全南大學校 農業科學技術硏究所 2014 農業科學技術硏究 Vol.48 No.-
A closed recycling system has been considered as the most effective system in hydroponics because the system helps plants absorb fertilizer in nutrient solution and can contribute environmental pollution by deducing direct discharging of surplus fertilizer in fields. For the development of a closed recycling system, an automatic control system of discharged nutrient solution by monitoring real-time absorption is necessary in order to control inorganic ions individually and exclude surplus inorganic ions in nutrient solution. But, the real-time monitoring system has not been put to practical use because of high price and low accuracy of sensors such as ion-selective electrodes. A model for predicting ion-concentrations in discharged nutrient solution can be a alternative method to replace the real-time monitoring system. This study was carried out to develop a model for the prediction of ion-concentrations in discharged nutrient solution using an artificial neural network with the backpropagation learning algorithm. Experiment results showed that the neural network showed excellent trained results with training data for all macronutrients of NO3 -, Ca2+, Mg2+, K+, SO4 2- and PO4 2-. Coefficients of determination (R2) were over 0.99 for all ions. Also, the trained neural network showed good prediction performance with verification data for macronutrients of NO3 -, Ca2+, Mg2+. The developed neural network can be applied to the prediction of ion-concentrations for other hydroponic plants and the replacement of a real-time monitoring system for a closed recycling system in hydroponics.