• Journal of information and communication convergence engineering
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• 제17권3호
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• pp.198-204
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• 2019

In this study, the author introduces a supply-chain management (SCM) solution that connects suppliers, manufacturers, customers, and other companies within a transactional relationship to enable efficient inventory management and timely product supply, which ultimately maximizes corporate profits. This proposed solution exploits Fourth Industrial Revolution technologies, such as artificial intelligence (AI) and the Internet of Things (IoT), which provide solutions to complex management issues generated by the broader market. The goal of the current study was to develop an advanced and intelligent smart SCM solution that complies with logistics standards, to enhance the visibility, safety, and efficiency of a supply chain made up of manufacturers and suppliers. This smart SCM solution aims at maximizing corporate profits through efficient inventory management and timely supply of products, and solves the complex management problems caused by operating within a wide range of markets.

• 품질경영학회지
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• 제5권1호
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• pp.23-29
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• 1977

Geometric programming is very useful for the solution of certain nonlinear programming problems in which the objective function and the constraints are posynomial expressions. By solving the dual program, it can be obtained that the solution of the primal program of Geometric programming. And, more efficient solution is to form an Augmented program possessing degree of difficult zero. A regional water-quality management problem may involve a multistage constrained optimization with many decision variables. In this problem, especially, appling that solution to it is also useful. This paper is described that : 1) the efficient solution of a water-quality management model formed by Geometric programming and 2) the algorithm developed to apply easily a real system by modifing and simplifing the solution.

• 한국토양비료학회지
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• 제48권1호
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• pp.30-35
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• 2015

This study was conducted to investigate investigated the effect of nitrogen fertilizer on nitrate concentration in soil solution and to determine the relationship between yield and nitrate concentration in soil solution for cucumber cultivation under plastic film house. Nitrogen as urea was applied at rates of 0, 120, 240, 360, and $480kg\;N\;ha^{-1}$ as an additional fertilizer by trickle irrigation during cucumber cultivation. Monitoring of nitrate concentration in soil solution was investigated using porous cups at 25 cm depth under soil surface. Nitrate concentration in soil solution increased with increasing the rate of additional nitrogen. Correlation coefficient between EC value and nitrate concentration was positive in soil and soil solution (p<0.05). An additional nitrogen of about $300kg\;ha^{-1}$ was shown the highest yield of cucumber, and improved yield by 5% compared to N recommendation of $240kg\;N\;ha^{-1}$. The highest yield was determined at nitrate concentration of $82mg\;L^{-1}$ in soil solution by regression equation ($Y=74.2+0.73X+0.000504X^2$, $R^2=0.629^*$). These results means indicate that nitrate concentration in soil solution would be useful method to rapid determination for additional nitrogen during cucumber cultivation under plastic film house.

• Journal of Electrical Engineering and Technology
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• 제4권3호
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• pp.330-336
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• 2009

This paper proposes an on-line voltage management and control solution for a distribution system which can improve the efficiency and accuracy of existing off-line work by collecting customer voltage on-line as well as the voltage compensation capability of the existing ULTC (Under Load Tap Changer) operation and control strategy by controlling the ULTC tap based on pattern clustering and recognition. The proposed solution consists of an ADVMD (Advanced Digital Voltage Management Device), a VMS (Voltage Management Solution) and an OLDUC (On-Line Digital ULTC Controller). An on-line voltage management emulator based on multi-thread programming and the shared memory method is developed to emulate on-line voltage management and digital ULTC control methodology based on the on-line collection of the customer's voltage. In addition, using this emulator, the effectiveness of the proposed pattern clustering and recognition based ULTC control strategy is proven for the worst voltage environments for three days.

• 정보처리학회논문지C
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• 제15C권2호
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• pp.125-132
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• 2008

인터넷 기술의 발달에 따라 온라인 서비스를 이용하기 위해 개인이 관리해야 할 아이디의 수가 증가하였고, 사용자의 아이디와 패스워드를 안전하고 편리하게 관리할 수 있는 아이디/패스워드 통합 관리 제품이 개발되어 사용되고 있다. 하지만 이러한 제품에서 관리자 패스워드가 노출되면 사용자의 모든 정보가 노출될 수 있는 위험이 있다. 따라서 현재 상용 제품의 취약성 분석을 통해 보안요구사항을 도출하고, 안전한 아이디/패스워드 통합 관리 제품 개발의 지침으로 용될 평가기준이 필요하다. 본 논문에서는 도출된 보안요구사항을 바탕으로, 안전한 아이디/패스워드 통합 관리 제품을 위한 평가 기준을 제안한다.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.516-522
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• 2023

The co-precipitation process plays a key role in the decontamination of radionuclides from low and intermediate levels of liquid waste. For that reason, the removal of Cs ions from waste solution by the co-precipitation method was carried out. A simulated liquid waste (¹³³Cs) was prepared from a 0.1 M CsCl solution, while wastewater generated by washing steel ash served as a representative of radioactive cesium solution (¹³⁷Cs). By co-precipitation, potassium ferrocyanide was applied for the adsorption of Cs ions, while nickel nitrate and iron sulfate were selected for supporting the precipitation. The amount of residual Cs ions in the CsCl solution after precipitation and filtration was determined by ICP-OES, while the radioactivity of ¹³⁷Cs was measured using a gamma-ray spectrometer. After cesium removal, the amount of cesium appearing in both XRD and SEM-EDS was analyzed. The removal efficiency of ¹³³Cs was 60.21% and 51.86% for nickel nitrate and iron sulfate, respectively. For the ash-washing solution, the removal efficiency of ¹³⁷Cs was revealed to be more than 99.91% by both chemical agents. This implied that the co-precipitation process is an excellent strategy for the effective removal of radioactive cesium in waste solution treatment.

• 한국산학기술학회논문지
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• 제5권1호
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• pp.7-12
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• 2004

급액관리에 관련된 단계를 4단계로 나누었으며, 각 단계별 수분 이동 저항을 규명하고, 단계 중에서 급액 상황에 따라 관련 인자의 priority를 설정함으로써 펄라이트 자루재배할 경우 율속인자 중심의 적정 급액관리 기준을 제안하였다. 특히, 급액관리의 가장 중요한 율속인자인 뿌리까지의 수분도달거리를 최소한으로 하여 필요한 수분을 공급하는 과정과 역사성을 부여한 뿌리발달 조장이 가장 중요한 것으로 판명되었다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.990-992
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• 2011

In this paper, we introduce a new Tabu method to get K-anonymity character in database information privacy protection. We use the conception of lattice to form the solution space for K-anonymity Character and search the solution area in this solution space to achieve the best or best approach modification solution for the information in the database. We then compared the Tabu method with other traditional heuristic method and our method show a better solution in most of the cases.

• 한국컴퓨터정보학회논문지
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• 제11권3호
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• pp.97-105
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• 2006

변화하는 기업 환경에 효과적으로 대응하기 위해서는 우리나라 중견 제조업 환경에 적합한 생산 마스터 정보관리 솔루션 도입이 시급하다 따라서 본 논문에서는 사용하기 편리한 사용자 인터페이스를 가지며, 다양한 시스템들과도 쉽게 연동할 수 있도록 표준 데이터 구조를 설계하였다. 또한 표준 데이터 구조를 중간언어 형태로 생성해 주는 자동화 연동 모듈을 탑재하고, 생산 관리 데이터의 확장이 가능한 생산 마스터 정보관리 솔루션을 개발하였다. 본 개발을 통하여 업무적으로는 관리하지 않았던 데이터를 관리함으로써 보다 효율적인 업무 프로세스 구성을 이룰 수 있을 뿐만 아니라 시스템 확장 시 보다 안정적인 시스템 구축을 위한 근간을 제공할 수 있다.

• 한국경영과학회지
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• 제19권1호
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• pp.113-122
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• 1994

This study proposes a new procedure to find an initial solution to reduce the number of iterations of goal programming. The process of computing an initial solution is divided into two steps in this study. Decision variables which satisfy feasibility using Gaussian eliminations construct an initial solution reducing the iterations in the first step. It uses LHS as a tool that decision variables construct an initial solution. The initial solution which is constructed by the first step computes the updated coefficient of the objective function in the second step. If the solution does not satisfy the optimality, the optimal solution using the Modified Simplex Method is sought. The developed method doesn't reduce the overall computing time of goal programming problems, because time is more required for the process of constructing an initial solution. But The result of this study shows that the proposed procedure can reduce the large number of iterations in the first step effectively.