• Journal of Dairy Science and Biotechnology
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• 제40권4호
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• pp.173-181
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• 2022

Industrial-scale Ca-fortified Dangmyon was manufactured with added casein phosphopeptides (CPP) to increase Ca adsorption in the intestine. Very low P content in eggshell Ca (egg Ca) and Dangmyon could make it possible to indirectly measure CPP content in Dangmyon. Partitions of the whole P present in Dangmyon were made into sweet potato, egg Ca, and CPP. The CPP content was obtained by multiplying CPP per P by the amount of P partitioned into CPP. It was found that 88.46% of CPP was obtained. However, when milk Ca, which was much higher in P, was added to fortify Dangmyon with CPP, it was found that the CPP content was either under- or over-estimated. Care must be taken when a much higher content of P as a Ca source is selected using this method. It was discovered that the added Ca and CPP were retained after cooking at boiling temperature; therefore, Dangmyon could be an excellent Ca and CPP carrier for humans.

• KEPCO Journal on Electric Power and Energy
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• 제6권1호
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• pp.49-52
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• 2020

Since power plant is an important system to provide electricity, it is necessary to monitor it in order to operate safely. Much information related with machine diagnosis exists in written form instead of digital data. So, it causes difficulties of analyzing and finding solutions. Rulebased expert system can provide flexible and effective solutions to users. In this paper, Recursive Bayesian Estimation is applied in order to increase accuracy of solutions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.694-695
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• 2007

최근 급속히 발전하고 있는 IT기술을 이용하여 송전선로 설계를 효율적이고 경제적으로 하기 위한 설계지원 프로그램인 PLS-CADD의 주요 기능을 살펴보고 기존 설계방식과 비교하여 어떠한 이점이 있는지를 알아보았다. 또한, 한국전력공사가 미얀마 500kV 기본설계에 사용한 실적이 있는 Optimal powerLINE과의 비교를 통해 어떠한 장점이 있는지를 검토하고 향후 국내외 송전선로 설계에 대한 PLS-CADD의 본격적인 적용을 위해 무엇을 검토해야 하는 지에 대한 방안을 제시하였다.

• KEPCO Journal on Electric Power and Energy
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• 제1권1호
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• pp.99-104
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• 2015

In this study, it has been initiated to investigate the specific abnormal vibration signal that has been captured in the power equipment. Array Microphone can be used in order to detect the direction and the position of the noise source. It is possible to track the abnormal mechanical noise in the power plant by utilizing the program and the microphone array system developed from this research. Array microphone system can be operated as a constant monitoring system.

• KEPCO Journal on Electric Power and Energy
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• 제3권1호
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• pp.49-56
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• 2017

In order to examine the feasibility of Carbon Capture & Sequestration, a major technological strategy for the national goal of greenhouse gas reduction, this paper studies the various methods and corresponding costs for the transportation of $CO_2$ captured at the domestic thermal power plants, as well as performing comparative analysis with overseas CCS demonstration projects. It is predicted that the investment cost would be about 98 million USD when the using land-based pipelines to transport captured $CO_2$ from the thermal power plant located in the south coast. And using marine-based offshore pipelines, it will cost about twice the amount. When the captured $CO_2$ is transported from the power plant in the west coast instead, the cost is expected to increase substantially due to the transportation distance to the storage site being more than double to that of the south coast power plant case.

• 대한화장품학회지
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• 제37권3호
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• pp.283-288
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• 2011

미네랄은 이온 상태로 존재하기 때문에, 카보머나 아크릴레이트 계 점증 시스템의 저점도 가용화 제형에서는 고농도로 안정화하기 어렵다. 본 연구에서는 젤 에센스 제형 내 고농도의 미네랄을 안정화하기 위하여, 염류에 안정한 실리콘 코폴리올을 이용한 네트워크 필름을 만들고, 네트워크 내에 미네랄을 고농도로 포집하여 피부에 오랜 시간 동안 고농도의 미네랄이 천천히 피부에 흡수될 수 있도록 제형을 설계하였다. 설계한 최적의 제형을 시료로 이용하여 6주간의 임상실험을 진행하였으며, 그 결과 피부 각질층의 미네랄 함량이 증가하고, 아미노산이 증가함으로써 각질층의 수분량이 증가하여 피부 투명도가 증가하였고 묵은 각질이 탈락하고 각질층이 정돈되어 피부 칙칙함과 피부 밝기가 개선됨을 확인하였다.

• KEPCO Journal on Electric Power and Energy
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• 제1권1호
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• pp.1-8
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• 2015

When the line and switchgear of the substation system are disconnected, ferro-resonance can occur. This happens even if the capacitive reactance and inductive reactance are not equal, which are not common resonance conditions. Resonance conditions vary depending on the busbar configuration environment. Although the damping resistance method applying the existing saturable reactor to cope with ferro-resonance has been successfully applied on site, there can be loss of normal function during long-term operation. The reason is because the rise in the operating frequency of saturable reactors means the saturation number is increased. Therefore, it can no longer function as saturable reactor since the resistor having inadequate capacity is burned out. To address this problem, in this paper, an EMTP-based simulation test was performed by designing and applying a dual reactor method, which adds an extended divergence reactor to the 1st side of the VT. The test result confirms that when the divergence reactor is inserted, the voltage and current values obtained at the 1st side and 2nd side of the VT as well as current values of divergence reactor part were stabilized from the transient phenomena and return to normal values. When compared with existing measures, although this method is similar in adding having a reactor added to a system regarding ferro-resonance, it has the advantage of being able to prevent ferro-resonance in advance since the reactor is added before the system is saturated. In addition, because it does not use damping resistance, it can extend the equipment life and stabilize its operation. Therefore, there are a lot of differences in terms of its operating characteristics and achivement of goal between the conventional method and new divergence reactor method.

• 한국건설관리학회논문집
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• 제10권5호
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• pp.95-103
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• 2009

하천시설공사의 경우, 비정형적인 하천공사의 특성과 개략 공사비 산정을 위한 기준단가의 부재와 기본 설계단계 부재에 따른 가용정보의 부족 및 변동의 가능성 등의 특정으로 개략공사비 산정에 많은 어려움이 존재한다. 기존의 하천공사의 개략공사비 산정은 하천제방의 대표 단면의 물량 산출을 통한 대표 단면 공사비 산정 후, 이에 단순히 연장(m)을곱하는 방식을 적용하고 있다. 본 연구에서는 체계적인 개략공사비 산정 방법론이 존재하지 않는 하천공사의 개략공사비 산정 방법론을 제시하는데 있어, 기본설계가 없는 하천시설물공사의 특성을 고려해 기획단계에서의 개략공사비 산정 모델을 개발하고자 한다. 이를 통해 국가예산이 투입되는 공공공사에서 국가예산의 낭비를 방지하고, 보다 체계적이고 정확한 공사비 산출을 가능하게 하고자 한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.463-467
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• 1992

This paper describes the automatic generation of sequence control programs for DCS(Distributed Control System), PLC(Programable Logic Controller) and so on. Since there is no same manufacturing process, it is difficult to standardize sequence programs. We propose the automatic sequence control program generator which is CAD software using knowledge engineering technique.

• 상하수도학회지
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• 제29권4호
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• pp.459-468
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• 2015

Deposits discharged through the cleaning mainly were cement mortar, bitumen paintings and rust pieces, and fragments of perforation, stones and gravels. Deposits were more removed through swabbing pig cleaning rather than air scouring cleaning on the whole. However, air scouring cleaning were not influenced by the constraint conditions such as a change in the diameter or the presence of the valve in water mains compare to swabbing pig cleaning. So, it was thought that air scouring cleaning might be more favorable to water distribution network cleaning in the future. After the cleaning, water quality including residual chlorine and turbidity also was improved because of the removal of a significant amount of the deposits. Therefore, if the cleaning is continuously and regularly implemented in water mains, it is expected that it will help to recover the reliability and to preserve the health of water quality.