• Journal of Ocean Engineering and Technology
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• v.26 no.6
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• pp.33-38
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• 2012

In our study, a closed-type penetration unit for standard penetration test (SPT) equipment was developed in order to operate in an underwater environment. This type causes energy dissipation, mainly due to the small gap between an airtight case and moving hammer. The dissipation was estimated through a CFD analysis. The computed dissipated energy was less than 1.2% compared to the potential energy of the hammer with the given gap. Subsequently, the impact energy of the underwater SPT equipment was within 1.2% of that for the SPT equipment on land.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.764-767
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• 2010

The high enthalpy plasma research center in Chonbuk national university is under construction for MW class plasma wind tunnel. Four types of plasma equipment will be installed in the research center. The equipments are 1set of 0.4 MW class enhanced Huels type plasma equipment, 1 set of 2.4 MW class enhanced Huels type plasma equipment, 1 set of 60 kW RF plasma equipment and 1 set of 200 kW RF plasma equipment. And electrical, water and gas utilities to assistant plasma equipments are under construction. The research center consists of experiment building, research building, power supply building, air supply building, cooling tower foundation.

• Journal of the Korean Society of Propulsion Engineers
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• v.22 no.4
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• pp.125-132
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• 2018

The mechanical ground support equipment of a Korea Space Launch Vehicle-II launch complex is a collection of systems used for transporting, erecting and lowering the launch vehicle. It also provides an interface for supplying propellants. In this paper, compositions, functions and design results of mechanical ground support equipment are introduced. Additionally, the operational concept of each piece of equipment is presented with operation procedure.

• New & Renewable Energy
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• v.16 no.4
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• pp.49-64
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• 2020

Photovoltaic and Thermal collector (PV/T) systems are renewable energy devices that can produce electricity and heat energy simultaneously using solar panels and heat exchangers. Since PV/T systems are exposed to the outdoors, their reliability is affected by various environmental factors. This paper presents a reliability test for a PV/T system and evaluates the test results. The reliability assessment entails performance, environment, safety, and life tests. The factor that had the greatest influence on the life of the system was the hydraulic pressure applied to the heat exchanger. A test was conducted by repeatedly applying pressure to the PV/T system, and a reliability analysis was conducted based on the test results. As a result, the shape parameter (β) value of 5.6658 and the B10life 308,577 cycles at the lower 95% confidence interval were obtained.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.24-24
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• 2018

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.141-141
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• 2018

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.245-245
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.110-110
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.111-111
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.187-187
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• 2017