• 전기학회논문지
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• 제61권3호
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• pp.442-450
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• 2012

Almost domestic power plants are being operated by foreign distributed control system. Many korean power plants are being operated over their lifetime so they need to be retrofitted. So we are developing the distributed control system to solve this problem by our own technique. The simulator was already made to verify the reliability of the algorithms. The unit loop function tests of all algorithms were finished in the actual distributed control system for installation of power plant and their results were satisfactory. The unit loop function tests are for each unit equipment algorithm. So the total operation tests will be made with all algorithms together in the actual distributed control system to be applied to power plant. When the verification through all tests is finished, algorithms with hardware will be scheduled to be installed and operated in the actual power plant. This research result will contribute to the safe operation of the deteriorated power plant and korean electric power supply as well as domestic technical progress. This entire processes and results for the development are written for the example of boiler feedwater master algorithm out of all algorithms in this paper.

• 조명전기설비학회논문지
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• 제26권7호
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• pp.99-109
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• 2012

Sub-station, key equipment in electric power infrastructure, are being exposed to increasing risk of hacking. For this, soft redundancy sub-station system needs to be formulated with automatic restoration mechanism. For this it is important to assess the reliability of the applicable range of data that are used in actual system operation, as well as the methods and findings of the tests. At the same time performance of soft redundancy system and total security mechanism, which are aligned for the protection of the sub-station, need to be tested. For testing the above-mentioned, this paper presented a viable formation of a soft redundancy practical VPN system within a panel to protect the latter from hacking or cracking incidences, and conducts a test to check if the considered system actually serves the protection function in the actual operation setting, gathering evidence from the data from the testing of the actual performance of the system as well as of emergency scenario simulation operations. Because tested soft-redundancy & restorative sub-station system is expected to be widely applicable for various cases such as Smart-grid or electricity IT system, where VPN with enhanced level of security is required.

• 한국수소및신에너지학회논문집
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• 제11권4호
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• pp.149-159
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• 2000

This paper is concerned with the performence of a steam reformer for 25kW class MCFC, which is compared with the theoretically calculated results at various operating conditions. The theoretical $H_2$ production amount and $CH_4$ conversion rate are calculated with variations of temperature and steam/carbon (S/C) ratio using fortran program, and the actual values are measured from flowmeter and gas chromatography. As a result of the comparison of theoretical and actual values, the theoretical $H_2$ production amount is calculated by $24.4m^3/hr$ at the normal operating condition(LNG $9m^3/hr$, S/C ratio 5, absolute pressure $2.77kg/cm^2$, $610^{\circ}C$), but the actual production amount is only $19.4m^3/hr$, which is 79.5% of the theoretical value. Nevertheless, at the normal operating condition, the reformer for 25kW class MCFC performed well for a 2,100 hr long run operation, constantly producing $H_2$.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.921-926
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• 2006

The present study has been conducted economic analysis through actual operation of EHP and GHP which are installed at the same building of an university Cost items, such as initial cost, annual energy cost and maintenance cost of each system are considered to analyze LCC and economical efficiency is compared. The initial cost is considered on the basis of actual costs, and annual energy cost is converted into the cost after measuring electricity and gas consumption a day. LCC applied present value method is used to assess economical efficiency of both them. Variables used to LCC analysis are electricity cost escalation rate, natural gas cost escalation rate, interest rate, and service lives and when each of them are 4%, 2%, 8%, and 20 years, results of analysis short that EHP(148,257,306 won) is 8.05%(12,981,990 won) more profitable than GHP(161,239,295 won).

• 공학교육연구
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• 제26권4호
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• pp.66-78
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• 2023

The purpose of this study was to analyze the actual condition of the innovative sharing university project. To this end, a focus group interview was conducted by selecting officials participating in the innovative sharing university project as study participants. The collected data was analyzed using the content analysis method. The results of the study are as follows. First, in terms of the promotion system and operation dimension of project group, study participants presented difficulties and improvements in terms of the national promotion system and university-level project operation. Second, in terms of curriculum management dimension, study participants presented difficulties and improvements in content development and sharing, engagement support for professors and students participation, and securing and sharing educational infrastructure. Third, in terms of management of project performance indicators, study participants presented difficulties and improvements in managing core performance indicators, managing autonomy performance indicators, and sharing project performance. Based on these study results, suggestions for the use of research results were presented.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년도 추계학술발표대회 논문집
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• pp.192-197
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• 2009

Nowadays, apartment is become a representative residential pattern. With these tendency, the concern about the apartment community in order to recover the dreary relationship with neighbors which is one of theproblem of the modern society and supplement of insufficien space of the community. However, this kind of community facirlities programs aren't individualized and it's operation is so paltry that it's actuasituation is no more than a simplesupply. Therefore, this study selected two cases of the apartments which are similar in size of number of families and construction year among winners of an excellent apartment award. I would like to focus on actual conditions of operation and use of the community facilities in management sides' view attempted a comparative analysis.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.196-201
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• 2004

Adhesive joints have been widely used for fastening thin adherends because they can distribute the load over a larger area than mechanical joints, require no hole, add very little weight to the structure and have superior fatigue resistance. However, the fatigue characteristics of adhesive joints are much affected by applied pressure during curing operation because actual curing temperature is changed by applied pressure and the adhesion characteristics of adhesives are very sensitive to manufacturing conditions. In this study, cure monitoring and torsional fatigue tests of adhesive joints with an epoxy adhesive were performed in order to investigate the effects of the applied pressure during curing operation. From the experiments, it was found that the actual curing temperature increased as the applied pressure increased, which increased residual thermal stress in the adhesive layer. Therefore, the fatigue life decreased as the applied pressure increased because the mean stress during fatigue tests increased due to the residual thermal stress.

• 한국초전도ㆍ저온공학회논문지
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• 제1권2호
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• pp.25-29
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• 1999

The purpose of this paper is to find the magnetic filed distribution inside the motor in order to find out if the high-Tc superconducting tapes operate stably in actual motor operation in a detailed model of the actual motor was analyzed through F.E.M.(finite Element Method). As a result, it has been proved that the high-Tc superconducting tapes can with-stand 4 A of current with staility. 4 A was the amount of current with stability. 4 A was the amount of current needed to achieve 600 A·turns which is required by the previous simulation aimed at developing this the flux damper reduces armature reactance during the motor operation. But it was observed that the flux damper generates loss by means of leakage flux and this decreases the output of the motor by about 5%.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 하계종합학술대회 논문집
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• pp.89-93
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• 1989

In this paper, a mathematical engine model based on the actual engine operation is formulated to be adapted for the evalution and development of engine control system. In the model the classification of fuel paticle siza is considered. The model is simulated through the mathematical interpretation of intake manifold in the rapidly-accerated state. The spark-timing is analyzed with respect to engine r.p.m. The result shows that the model behaves similar performance to the actual engine operation and the spark-timing is very important to the characterization of engine r.p.m..

• 한국농촌건축학회논문집
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• 제9권2호
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• pp.49-56
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• 2007

The aim of this study is actual conditions to analyse of community center in Cheongweon-gun and propose operation method. In this study, I deduced some problems and proposed improvement planing corresponded to new needs through such as external appearance, inner space analysis, operating actual conditions analysis and etc., of existing community center in Cheongweon-gun. And I wish to present more efficient architectural space organization and operation method with these surveying results. The result of this study are as follows; Community center as representative community facilities is necessary to reflect of village characteristics on the exterior of buildings, and decision of scale and usage considered number of residents, visitors, and ages. For management of the community center, it is necessary of sustainable obtain of management cost, and provision against rebuilding and enlargement of building.