• 전기학회논문지
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• 제67권6호
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• pp.715-723
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• 2018

The energy storage system consists of batteries, power conditioning system and energy management system. If ESS is installed and operated in the field, SAT(Site Acceptance Test) of ESS is being essentially required for the safety and performance of ESS. Furthermore, in order to more accurately and reliably validate the performance of the ESS in advanced countries, it has been required to perform not only performance testing by H/W equipments but also performance verification by S/W tool. Therefore, this paper proposes the modeling of portable test equipment in order to evaluate the performance and reliability of ESS by using the PSCAD/EMTDC S/W. And also, the prototype of 30[kW] scaled portable test equipments is implemented based on the S/W modeling. From the results of various simulations and testings such as power quality, LVRT and anti-islanding tests, it is confirmed that 30[kW] scaled portable test equipment is useful for SAT of ESS, because the simulation results of PSCAD/EMTDC are identical to them of 30[kW] test equipment at the same test conditions.

• 한국화재소방학회논문지
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• 제30권5호
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• pp.124-129
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• 2016

현행법상 현장방염 처리한 실내장식물은 관할 소방서에서 45도 연소시험을 통해 방염성능검사에 합격하여야 한다. 45도 연소시험법은 방염성능을 확인할 수 있는 가장 정확한 시험법이지만 시료 제출자가 부정시료를 제출하였을 경우에는 시험결과를 신뢰할 수 없다. 따라서 본 논문에서는 이러한 문제를 보완하기 위하여 X-선 형광분석기를 이용한 현장방염 검사방법을 제안하고자 한다. 총 10종의 방염도료를 합판 및 MDF에 처리하여 그 성분을 X-선 형광분석기로 분석한 결과 함유된 물질의 함량 차이로 인해 각 방염제마다 고유의 스펙트럼을 나타내고 있었으며, 측정기기로 손쉽게 각 물질별 함량(%)을 확인할 수 있었다. 따라서 제도적인 절차가 마련된다면 효율적인 현장방염검사방법으로 사용될 수 있을 것으로 기대된다.

• 터널과지하공간
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• 제33권6호
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• pp.472-482
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• 2023

격자형 또는 주방식 공법은 수평으로 매장된 광물을 채굴할 목적으로 적용되는 공법이다. 본 연구에서는 자연 암반을 암주로 사용하는 주방식 공법을 지하공간 건설에 적용하기 위해 설계와 파일럿 테스트를 수행하였다. 파일럿 테스트가 수행된 지역은 기존 골재 광산을 운영하는 곳으로 양호한 암반 조건과 적당한 심도를 보유하고 있었다. 파일럿 테스트 부지는 연구 결과 적용이 가능한 광산을 기반으로 접근성, 지반조건 등을 검토하여 후보지를 결정하였으며 상세 지반조사와 설계를 통해 부지 조성공사를 수행하였다. 파일럿 테스트는 암주형상을 8×8 m로 공간의 단면을 8×12 m 크기로 설계되었다. 시험발파를 통해 발파패턴을 결정하고 89공 3 m 굴진 단면 발파를 수행하여 총 92 m 굴진을 완료하였다. 현장 측정을 통해 평균 폭 12.5 m, 평균 높이 8.3 m을 확인하여 연구에서 고려하는 단면 모양과 유사하게 굴착공사를 진행할 수 있었다.

• 대한치과보철학회지
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• 제36권5호
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• pp.758-771
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• 1998

Assessment of implant mobility is an important and reliable method to clinically evaluate implant stability. PerioTest is a precise and reproducible device that cam dynamically measure the reaction of damping characteristics of peri-implant tissue. The aim of this study is to evaluate the effects of amount of implant surface area, diameter, type, implantation site, degrees of cortical engagement, and length of time in function on PTVs and to find out the most determining factor on PTVs. The results are as follows 1. 5.0mm diameter implants show significantly lower PTV than that of 3.75mm diameter implants. 2. PTV in the mandible is significantly lower than that of the maxilla 3. In the maxilla, there is no significant difference in PTV during the first year of implant function, but during the second year a significant decrease in PTV is noted. 4. In the mandible, there is a significant decrease in PTV during the first and second year of implant function. 5. Implantation site seems to be the most determining factor on PTV among the influencing factors in this study. In conclusion, the amount of implant surface area, type, degrees of cortical engagement had no significant effect on PTV, but installation site and diameter influenced significantly on PTV

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1997년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Fall 1997
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• pp.257-264
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• 1997

Seismic responses of the Hualien large scale seismic test model on a layered soil site are estimated for two recorded earthquakes and the analysis results are then compared and evaluated with the recorded responses. The method adopted for the analysis is based on substructuring method using a lumped parameter model in both the frequency and time domain. the study results indicate that the proposed method can reasonably estimate the earthquake responses of a soil-structure interaction system for engineering purposes.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 사면안정학술발표회
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• pp.93-101
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• 2003

Steel frame-type retaining walls(SFRW) are constructed by on site bolting of prefabricated steel frames and internal filling of materials such as rocks with the size of 150-300mm. Easy & fast construction, superior drainage performance and structural performance to rigorous site conditions are some of the merits of applying the SFRW to various construction sites. After the development of the structural details, a test construction of SFRW, with the height of 6m and 30m in length, was carried out at an apartment site. After completion, several months of monitoring was carried out on the structure to check displacement, tilting, settlement, soil pressures and drainage characteristics. The results of the structural behavior of SFRW along with its construction methods are presented in the paper.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1065-1070
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• 2004

Recenlty, there are many cases that structures are constructed on soft ground in domestic. Generally in those cases, appropriate geotechnical techniques for the ground are needed. In this study, an example for ground improvement of OO railroad station construction site is introduced and analyzed. The ground conditions of this site which is soft ground are that N value is under 6, average depth and ground water table is 24.4m, GL-1.7. So, as a countermeasure technique for bearing reinforcement, Compaction Grouting System (CGS) method was applied on construction site. To estimate the application of CGS method, piezo cone penetration test and static pile loading test were carried out during the construction. Results of analysis show that CGS method for improving the bearing capacity of soft ground is applicable for the ground well.

• Journal of electromagnetic engineering and science
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• 제8권1호
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• pp.1-5
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• 2008

In this paper, a biconical type antenna is proposed for EMI test site validation above 1 GHz. To achieve broadband and omni-directional radiation patterns required by international standard(CISPR), the proposed antenna consists of general bicones with cylindrical loads and adopts side feeding method to minimize the influence on H-plane pattern due to feeding cable, balun, and connector. The radiation patterns of the fabricated antenna are measured and the results are compared with CISPR criteria and commercial antenna in our interest frequencies. Although the proposed antenna has a few problems in frequency range of 1 GHz to 2 GHz, it has relatively better performance than commercial antenna.

• Elastomers and Composites
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• 제47권3호
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• pp.254-258
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• 2012

자동차 엔진 개스킷용 아크릴 고무(ACM)의 재료 특성과 수명 예측에 관하여 연구하였다. 클로린 가교사이트를 포함하는 ACM (Chlorine Cure-Site ACM)과 카르복실기 가교사이트를 포함하는 ACM (Carboxyl Cure-Site ACM)을 이용하여 최적상태의 배합물을 제작하여 특성을 살펴보았다. 엔진용 개스킷의 주요한 특성인 열과, 엔진오일에서의 압축영구줄음율을 시험 평가한 결과 Carboxyl Cure-Site ACM 배합물이 상대적으로 더 우수한 것으로 나타났다. Carboxyl Cure-Site ACM 고무 재료에 대한 수명을 예측하기 위해 가속열노화시험을 수행하여 시간-온도 환산식인 아레니우스(Arrhenius) 관계식을 구하였다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제21권6호
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• pp.1-13
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• 2016

The programmable logic array to match the treatment technology to the soil contaminated site based on the site properties in Korea was developed. Based on the previous technology screening system of FRTR (Federal Remediation Technology Roundtable) in USA, total 9 evaluation factors indicating the site characteristics were used for the technology matching process and 8 factors among them were quantitatively weighed in the order of importance. The class interval for each evaluation factor was linearly distributed to give the weighed score and 8 scores were summed up to prioritize the treatment technology. The optimal treatment technology for a specific site was determined according to the total score acquired from 8 evaluation factors used in this technology matching process. The reliability test for the developed technology matching system was done by using information of two real cleanup sites in Korea, suggesting that this guideline will be available to determine the most effective treatment technology to cleanup the soil contaminated site and also to assist the government or the company to design a successful and cost-effective site cleanup plan in Korea.