• Journal of Species Research
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• v.5 no.3
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• pp.309-312
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• 2016

Cleantioides rotundata (Kussakin, 1982) is reported for the first time in South Korea. Specimens of C. rotundata were collected with a small hand net from the intertidal zone of Opo-ri, Yeongdeok-gun in South Korea. This species makes tubes using seagrass debris at our sampling location and distinguished by the following characteristics: pleotelson long, length almost 1.6 times as long as width; dorsum of distal one third with deeply bilobed depression on plane. In this paper, we provide descriptions of diagnostic characteristics and illustrations of morphology of C. rotundata. Additionally, a key to the Korean species of the genus Cleantioides is provided and the partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) are provided as molecular characteristics.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.11a
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• pp.63-64
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• 2005

CdS thin films were fabricated by rf magnetron sputter technique, and annealed in tube furnace using vacuum evaporated $CdCl_2$ layer, In addition, effects of the thickness of $CdCl_2$ layer and the annealing temperature on structural and optical properties of CdS films were investigated. The heat treatment process was carried out by heating the sample in air at $350-500^{\circ}C$ for 20 minute.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.75-75
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• 2004

Carbon/epoxy는 기존의 금속재료에 비해 피로강도 및 기계적 특성이 매우 우수하다. 따라서 최근 튜브형태의 Carbon/epoxy 활용방안이 부각되고 있다. 그러나 Carbon/epoxy는 탄소재료의 특성상 고압, 충격 및 부식에 매우 취약하다. 또한, 장기간 고압피로 및 크리프에 노출될 경우, 금속재료에서는 관찰할 수 없는 층간분리(delamination)가 발생된다. 이러한 층간분리는 섬유방향과 평행하게 진전될 때 급격한 파손을 야기하므로 층간분리에 대한 메커니즘을 이해하고 그 방지책을 강구하는 것은 매우 중요하다.(중략)

• Proceedings of the Korean Institute of Building Construction Conference
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• 2009.05b
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• pp.29-32
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• 2009

Building foundations for Top-Down construction require a special setting, because the foundations have to be placed way before excavation for the substructure of main building, Usually, the foundation goes into the layer of rock and it is often called rock-pier foundation, Currently, a cage of steel reinforcing bars is inserted to the pre-excavated hole in the rock layer, hanging down from the wide flange steel column above. This paper presents a new method for connecting the prefounded column and the steel cage with a coupler for better connection between the two, The use of a circular Concrete Filled Tube (CFT) as a prefounded column makes it possible to have this type of connection. The details of the connection and application to a Top-Down construction site is also included in this paper.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.934-941
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• 2000

We measured the electron transport coefficients, the electron drift velocity W and the longitudinal diffusion coefficient $D_{L}$ in the 0.526% and 5.05% $C_{3}F_{8}$-Ar mixtures over the E/N range from 0.01 Td to 100 Td by the double shutter drift tube, and compared the measured results by Hunter et al. with those. We determined the inelastic collision cross sections for the $C_{3}F_{8}$ molecule by the comparison of the present measurements and the calculation of electron transport coefficients in the $C_{3}F_{8}$-Ar mixtures by using a multi-term Boltzmann equation analysis.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.35
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• pp.1-8
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• 1995

Automatic inspection system software for display image characteristic of CRT is developed. There are two major contributions of this software development. One is that the data from measuring equipments which was usually collected manually is automatically collected through RS-232C port and is saved in computer, then, trend analysis graph and final reports are generated. The other is that evauation of characteristic of electron gun was automatically processed by CCD camera and image processing technique. The system is developed under MS-Windows environment utilizing Borland C++4.0 Compiler and DT 3852-8 image processor board. This system can save the time and man power to measure and to anayze the image characteristics relative to current method.

• Progress in Superconductivity and Cryogenics
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• v.8 no.3
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• pp.1-4
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• 2006

The characteristics of Bi2212 round wire was systematically studied depending on different heat treatment conditions. Initial wire was drawn after routine PIT (Powder In Tube) process. The wire was divided into 3 pieces with 10 cm in length and 2.5 mm in diameter. 3 wires were pre-heat treated separately by different heat treatment schedules, heated in air and nitrogen atmosphere and centrifugally melted. Pre-heated wires were annealed at $845^{\circ}C$ for 40 hours in oxygen atmosphere. SEM results indicate that all pre-heated wires showed highly oriented microstructure. However the wire by centrifugally melted process showed higher density and better electric properties as compared with 2 other wires pre-heated in air and nitrogen atmosphere. The critical current of a centrifugally melted wire was about 18 A in 77 K.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.04a
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• pp.170-171
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• 2022

In recent years, due to the occurrence of traffic accidents caused by black ice in winter, the number of personal injuries is increasing rapidly. Black ice is a phenomenon that occurs like a thin layer of ice on the road surface. Accordingly, many developments of heat-generating concrete are being developed to remove ice by increasing the temperature by supplying constant electricity to places where black ice is likely to occur. These heating elements are being developed by mixing a conductive material represented by carbon nanotubes with concrete. However, research up to now has been focused on efficient temperature rise and derivation of the optimum mixing ratio, and the evaluation of maintaining heat generation performance during continuous repetition is insufficient. Therefore, in this study, a heating test specimen was manufactured and 50V power was repeatedly supplied to evaluate the heating characteristics.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.11a
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• pp.67-68
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• 2021

In this study, Repair mortar was prepared using CNT powder with improved dispersibility and its characteristics were analyzed. As a result of the experiment, the compressive strength and flexural strength were found to be at similar levels compared to Plain without CNT. In addition, as a result of the drying shrinkage test, it was found that the drying shrinkage amount was decreased due to the effect of CNT mixed into the porous material filling the internal pores of the repair mortar.. The Bond strength of the repair mortar was at a similar level regardless of whether CNT was added or not

• Nuclear Engineering and Technology
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• v.55 no.11
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• pp.4032-4038
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• 2023

Cu, which exhibits excellent corrosion resistance in underground environments, has been investigated as a canister material for use in the deep geological disposal of spent nuclear fuels. In this study, the technical viability of atmospheric plasma spraying for producing Cu-coated canisters was investigated. A high-purity Cu film (millimeter scale) was deposited onto a stainless-steel substrate using a plasma gun with a shroud structure. Potentiodynamic polarization studies revealed that the Cu film exhibited a sufficiently low corrosion rate in the groundwater electrolyte. In addition, no pitting corrosion was observed on the Cu film surface after accelerated corrosion studies. A prototype cylindrical Cu film was fabricated on a 1/20 scale on a stainless-steel tube to demonstrate the scalability of atmospheric plasma spraying in producing Cu-coated canisters.