• Aerospace Engineering and Technology
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• v.10 no.2
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• pp.133-145
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• 2011

This paper is about the results in Qualification Management activity performed between the Autonomous Test(AT) season(August. 2008) of Launch Complex and the 2nd flight test season(June. 10, 2010) of KSLV-I. All cryogenic fluids(LOX, $LN_2$) and compressed gases(Air, $GN_2$, GHe) were qualified by qualification management activity during AT(Autonmous Test), QT(Qualification Test) season for LP(Launch Pad) and LVAB(Launch Vehicle Assembly Building) and FT(Flight Test) season of KLSV-I. As the results, total 428 times of check analysis and 111 times of full analysis were performed.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.199-201
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• 2015

국방 분야에서 전술작전센터를 구성하는 전술작전통제 플랫폼은 다양한 내/외부 체계 시험 장치를 연동하여 교전/작전 통제를 수행하는 플랫폼이다. 기존의 전술작전통제 플랫폼은 서로 다른 환경에서 개발된 시험 장치 소프트웨어를 통합 구축하는데 어려움이 있으며, 플랫폼을 구성하는 서버 자원의 탄력적 분배가 불가능하다. 본 연구는 전술작전센터를 구성하는 전술작전통제 플랫폼을 오픈스택 클라우드 및 KVM 하이퍼바이저를 기반으로 구축하여 내/외부 체계 시험 장치 소프트웨어의 실행 환경을 가상 머신으로 제공하였으며, 가상 머신 간 고속 데이터 통신을 위해 데이터 분산 서비스 및 10Gbps 이더넷, QDR 인피니밴드 네트워크를 활용하였다. 또한 오픈스택 클라우드 기반 전술작전통제 플랫폼의 네트워크를 구성하는 10Gbps 이더넷 및 QDR 인피니밴드 네트워크상에서 데이터 분산 서비스의 성능 평가를 수행하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1533-1536
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• 2004

위성의 비행소프트웨어는 위성이 주어진 임무를 수행할 수 있도록 위성을 제어하는 것으로 지상으로부터의 원격 명령을 받아 처리하고 원격측정 데이터를 지상으로 송신하는 기능과 자세 결정 및 제어, 전력 제어, 열 제어, 탑재체 관리 등의 기능을 수행한다. 본 논문은 다목적실용위성 2호의 비행소프트웨어에서 원격측정 데이터를 저장하고 지상으로 전송하는 기능을 수행하는 MMD (Mass Memory and Downlink Management) 소프트웨어의 설계 및 구현 내용과 시험절차, 방법, 시험결과 등에 대해서 서술하였다.

• Analytical Science and Technology
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• v.20 no.1
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• pp.41-48
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• 2007

The determination method for the trace lead and cadmium in glass materials was developed by ICP-AES. The lead- and cadmium-DDTC chelates were formed by adding Na-DDTC (sodium diethyldithiocarbamate) as a chelating agent and extracted into MIBK (methyl-isobutyl ketone). Direct measuring of the trace lead and cadmium in glass was not possible because of the interferences of matrix elements as Na, Si, Mg and Ca of glasses unless solvent extraction of lead and cadmium was applied. This procedure was confirmed to be valid quantitative method of Pb and Cd analysis in glass did not influence of sample matrix, by applying it procedure to artifact sample and NIST SRM 1412.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.580-581
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• 2011

국내의 지중케이블 시스템은 1970년대 154kV급 OF케이블이 도입된 이래로 현재까지 345kV급 OF/XLPE 케이블을 이용한 지중송전선로가 운영 중에 있으며, 도심지역의 전력공급을 위해 지중송전선로의 건설비중이 점차 증가하고 있다. 그러나 지중송전 계통에서 고장발생시 사회적 파장이 크고 가공송전선로에 비교할 때 복구에 대단히 많은 시간과 비용이 소요되므로 설비의 안전운전 및 장기신뢰성의 확보가 반드시 필요하다. 따라서 지중송전계통의 현장 조건을 고려한 실증시험장 구축의 필요성이 대두되어, 한국전력공사에서 정부의 인프라구축 지원사업으로 초고압 지중케이블에 대한 국제품질 공신력 확보 및 최적운영기술을 확보하기 위하여 장기 신뢰성 시험이 가능한 설비와 국제적 규모의 실증시험장을 구축하였다. 아울러 2011년 3월에는 ISO/IEC 17025에 따른 국제공인시험기관 자격을 취득하여, 국내외에서 제작되는 초고압 케이블에 대한 국제 공인시험이 가능하게 되었다. 따라서 본 논문에서는 한국전력공사 고창전력시험센터 내에 구축된 지중케이블 시험장 및 장기신뢰성 시험설비에 대한 소개와 더불어 국제표준에 따른 공인시험방안과 현재까지 지중케이블 시험장에서 수행된 케이블 시험에 대하여 소개하고자 한다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.5
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• pp.103-111
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• 2022

Fine dust can cause serious problems to human health, and fugitive dust generated at construction sites is one of the main sources of fine dust in Korea. However, monitoring of the amount of fugitive dust generated at the ready-mixed concrete plant site is not performed, and only passive monitoring methods are partially applied in the field. Since it is impossible to control fugitive dust after it is exposed to the air, it is very important to suppress the occurrence or to remove it immediately at the stage of occurrence. Therefore, after identifying the characteristics through real-time monitoring in the fugitive dust generation stage, systematic management is required for suppressing or removing scattering dust in the field. In this study, the scattering dust generation characteristics were analyzed by measuring the particle mass concentration(PMC) of Fugitive dust generated at the aggregate unloading site of the ready-mixed concrete plant in real-time.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.1
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• pp.15-22
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• 2022

In this study, the hydration reaction and strength characteristic of cement mortar with spent coffee ground(SCG) was investigated. As a result of the study, it was found that as the firing temperature of the SCG increased, the mass loss due to the combustion of organic matter increased, but the density increased. In addition, when the SCG were mixed, SCG interfered with the hydration reaction and the compressive strength was significantly lowered. On the other hand, the coffee grounds ash(SCG_Ash) calcined at 800 ℃ showed a hydration reaction and a compressive strength equivalent to or higher than that of OPC mortar.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.36 no.1
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• pp.81-87
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• 2023

Heaters using the resistance heating principle are used in various industrial fields that require heat and are also essentially used in bidet among small home appliances. A planar heater and a coil-inserted heater mounted on a conventional commercially used bidet have disadvantages and limitations of complicated manufacturing process and local heating. In this study, silver-palladium (Ag-Pd) powder material was used for a screen-printing process that is more advantageous in achieving simplification than the existing process, and a rod-type heater for bidet was manufactured. The on-off cycle test under actual conditions was conducted to confirm the durability and the capability of the fabricated heater, and the fabricated heater operated more than 2,600 on-off cycles, which means it could be applied for a commercial product. In addition, through the on-off cycles under harsh conditions, the cause of failure was identified after the test that the durability limit temperature of the heater was 850℃. Through Ag-Pd rod heater in this study, it is expected to contribute to the efficient development of electrode materials for heaters and the improvement of the durability of heaters in the future.

• Journal of TMJ Balancing Medicine
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• v.13 no.sup
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• pp.27-33
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• 2023

The purpose of this study is to describe the effects of temporomandibular joint balancing therapy on a patient with a spinal accessory neuropathy. A patient reported sternocleidomastoid muscle and trapezius muscle weakness after self-massage. The patient was instructed to wear the Accurate Balancing Appliance (ABA) for at least 8 hours per day and maintain an upright posture. The patient received cervical spine manipulation on day 2, 4, and 6. The patient's progress was tracked based on the angle at which the head turned to the right from the midline when she lifted her head while lying down, as well as the muscle strength and pain in the right trapezius muscle. The patient recovered spontaneously after 7 days. The ABA and cervical spine manipulation assisted the patient in reducing fatigue and discomfort during daily activities.

• The Korea Journal of Herbology
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• v.39 no.3
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• pp.97-105
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• 2024

Objective : This study examined the effects of yaksun recipe on the anti-fatigue and endurance enhancement properties in the forced swimming test (FST). Methods : The treatment groups were divided randomly into three groups: water-treated FST (control), 200 mg/kg of red ginseng-treated FST (RG200), 200 mg/kg of water extract of yaksun recipe-treated FST (YS200). After FST, an autopsy was performed, and the tissue and serum were collected. Results : The swimming exhaustion time in the RG200 and YG200 groups were significantly increased compared to the control group. The YG200 group fatigue indicators, D-Lactate, LDH(lactate dehydrogenase), creatine kinase, and ammonia content, significantly decreased compared to the control group. In addition, liver glycogen content significantly increased in the YG200 and tended to increase in RG200. Likewise, the glucose contents were significantly increased compared to the control group. The muscle damage indicators GPT (glutamic pyruvic transaminase) and BUN (blood urea nitrogen), a protein metabolite, in the YG200 group significantly decreased compared to the control group. Furthermore the concentration of liver lipid peroxidation, MDA(malondialdehyde) levels significantly decreased in the RG200 and YG200 compared to control group. Conclusions : These results suggest that YG200 can increase the endurance exercise capacity by decreasing the fatigue indicators, saving glycogen, and elevating the antioxidant defense system.