• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.426-442
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• 2019

This study identifies possible determinants that may have influences on the switching behavior from the current payment system of credit or check cards to the easy payment service based on push-pulling-mooring model. And this research empirically tests how those determinants affect switching intention to the easy payment service. The moderating effect of policy expectation is also taken into account. The findings show switching intention to the easy payment service is influenced by the followings: dissatisfaction with the current payment system as a pushing factor, perceived easy of use and trust in easy payment service as pulling factors, and affective/cognitive inertia and unfavorable subjective norm as mooring factors. The results also show that moderating effect of policy expectation exists in the relationship between perceived ubiquitousness and switching intention.

• Journal of the Society of Naval Architects of Korea
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• v.58 no.3
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• pp.158-166
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• 2021

In this paper, a numerical analysis technique using a body force model is investigated to estimate the available net thrust of multi-pod-driven ice-breaking vessels under bollard pull and overload conditions. To employ the body force model in present flow simulations, drag and thrust components acting on the pod unit are calculated by using Propeller Open Water (POW) test data. The available net thrusts according to the direction of operation are evaluated in both bollard pull and overload conditions under deep water. The simulation results are compared with the model test data. The available net thrusts, calculated by the present analysis for ahead operating modes at 3~6 knots which are typical speeds of the target vessel in arctic field, are agreed well with the model test results. It is also found that the present result for astern operating mode appears approximately 6 % larger than the model test result. In addition, the available net thrusts are calculated under the both operating conditions accompanied by shallow water effects, and the main cause of the difference is studied. Based on the result of the present study, it is confirmed that the body force model can be applied to the performance evaluation of multi-pod propulsion system and the main engine selection in early design stage of the vessel.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.2
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• pp.527-536
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• 1995

Analysis of pultrusion process for the thermosetting composites containing volatiles was performed. Degree of cure, amount of volatile evolved and pulling force were calculated for the processing variables such as die temperature and pulling speed. Cure kinetics was modeled from the data obtained by DSC(Differential Scanning Calorimeter). The volatile evolution kinetics was modeled from the data by DSC as well as TGA(Thermo Gravimetric Analyzer). The cure kinetics and volatile evolution kinetics models were incorporated into the energy equation. The resulting governing equation was solved using finite element method. Pulling force was calculated through the analysis of pressure developed inside the pultrusion die. Experiments were performed and the data were compared with the calculated results. Good agreements were observed.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.219-222
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• 2007

The Full-Off Fitting of Movable Bracket using conventional line have received a dynamic contact impact between contact wire and pantograph of electric rolling stock, so this impact cause a rapid vibration of foreword and back near the supporting point of movable bracket. The Full-Off Fitting on Movable Bracket in conventional line differs from that in high speed line. Now conventional line have required a speed up for new electric locomotive and electric car. In speed-up track and big impact place, the Full-Off Fitting and the dropper often get demage. We have done a study of buffering function to solve that problem in conventional line. We have find a need adopting buffer fitting. It is decrease a dynamic impact between contact wire and pantograph of electric rolling stock.

• Proceedings of the Korean Society For Composite Materials Conference
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• 1999.04a
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• pp.103-108
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• 1999

A synthesized model of pultrusion process considering thermally induced deformatiion was established. The model was composed of liquid resin flow model thermo-chemical analysis and linear elastic analysis. in order to verify the above-mentioned models several experiments were performed. A laboratory scale pultrusion line was established and glass/polyester composites were fabricated. the experimental results were compared with the calculated ones. The model successfully could estimate degree of cure pulling force and amount of process-induced deformation.

• Proceedings of the KOSOMBE Conference
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• v.1995 no.05
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• pp.251-255
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• 1995

전기 유압식 좌심실 보조기에 있어서 현재 가장 큰 문제점 중의 하나로 지적되고 있는 것은 이완기에 좌심방의 혈액 유입상황을 고려하지 않은 과도한 밀판 당김 속도로 인해 생기는 좌심방의 함몰현상이다. 논문에서는 좌심방의 함몰현상을 구체적으로 정의하고, 좌심방의 함몰여부를 가늠하기 위해 외부에서 관측가능한 요소들과 좌심방의 상태와의 상관관계들을 고찰해 본 다음 이러한 함몰현상을 방지할 수 있도록 이완기 밀판 속도와 이동거리를 능동적으로 변화시키는 방식들을 구성하여 실험을 통해 그 효용성을 검증하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.7 no.2
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• pp.152-159
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• 2001

This paper presents a development of the recoil rod pull force measurement system suing the load cell with a sleeve normally available in the recoil system test. The commercial load cell cannot be used in the test of recoil system floating the breach contact point freely in the air. The load cell is designed and manufactured to meet the recoil system test condition. Theoretical analysis and experimental results show that the accuracy of the developed measurement system is within $\pm$0.5%. We notice that the measurement technique proposed in this paper is accurate and useful in the recoil rod pull force measurement of the recoil system.

• 한국정보통신설비학회:학술대회논문집
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• 2005.08a
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• pp.255-258
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• 2005

광케이블의 분기나 이전 공사 시 광케이블을 적확히 식별할 필요성이 있다. 현재의 광케이블 식별 방법은 인력당김에 의한 원시적인 방법이나 전자기 유도를 이용하는 방법 등이 사용되고 있으나 인력과 시간이 많이 소모되고 식별 가능한 거리에도 한계가 있다. 본 논문에서 제시하는 광케이블 식별 방법은 맨홀 등에서의 현장 작업자가 식별코자 하는 광케이블을 두드리는 등의 교란을 가하고, 이러한 교란을 광섬유 간섭계를 통하여 추출하여 다시 현장의 작업자에게 통신 수단을 통하여 전송하여 줌으로써 작업자가 직접 자신이 가한 교란 신호와 추출된 신호간의 일치 여부를 판단함으로써 광케이블을 식별할 수 있도록 하는 것이다. 이 방법에 따르면, 원격지의 현장에서도 수월하게 광케이블을 대조할 수 있어서 광케이블 절단 작업 시 오절단을 사전에 예방할 수 있다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.33 no.3
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• pp.257-261
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• 2000

Integumentary system of the polychaete, Perinezeis aibuhitensis was consisted cuticular, epidermal and dermal layers. Excretory pores opened in cuticular layer, which is covered with epicuticular projections. The hemidesmosomes were observed between supporting cell and basal area of cuticular layer. The epidermal layer was consisted supporting cells and unicellular glands. Supporting cell was relatively larger than the other neighbouring cells, and the nucleus had one to two nucleolus. Cytoplasm of the supporting cell had well-developed intracellular organs such as tonofilaments, mitochondria, rough endoplasmic reticula, free ribosomes and pigment granules of electron dense. The gland cells were reacted with blue in AB-PAS, and classified into the three types such as ${\alpha},\;{\beta}\;and\;{\gamma}$ from the transmission electron microscopic observation. Type ${\alpha}$ gland cell was ovoid and the cytoplasm had well-developed tonofilaments and membrane bounded secretory granules of $0.8{\~}1.5 {\mu}m$ in diameter. Type ${\beta}$ gland cell had a large vacuole and secretory granules of $0.5{\~}0.8 {\mu}m$, which scattered evenly in the cytoplasm. Type ${\gamma}$ gland cell had well-developed endoplasmic reticulum, Golgi auparatus and secretory granules of $0.2{\~}0.3 {\mu}m$ in diameter. The electron density of this granules was the highest among the granules.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.3
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• pp.331-338
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• 2008

Coal-tar enamel, blown asphalt and polyethylene have been used as wrapping materials of steel pipe in Korea. Currently, every manufacturer produces wrapped steel pipes with different materials and methods, and little research has been performed to get on wrapping methods and materials. In this research, properties of wrapping material of steel pipe used for water supply have been evaluated. All of the materials tested in this work were found to meet the standard. Among the wrapping materials of steel pipe tested, blown asphalt and coal-tar enamel were reasonable in price, and their mechanical properties were excellent. The quality of the wrapped steel pipes was being melted easily in organic solvent. When coated thick, the load of the steel pipes was higher than necessary. Tensile strength of cathode exfoliation and PE 3-layer wrapping method was excellent. The pulling intensity of T-Die PE 3-layer was stronger than PE fluidized in PE wrapping method. Cathode exfoliation area was smaller than PE fluidized. Mechanical property and thermo-property of T-Die PE 3-layer were excellent and its anti-chemical property was great. Liquid epoxy can change the property of coating materials depending on the hardening condition and resin selection. Polyurethane used in this test showed a less adhesive strength with steel pipes than epoxy. Moisture absorbance rate was higher than Epoxy's, however. To utilize polyurethane as wrapping materials, basic property of the matter should be improved followed by finding the best suited coating condition. The method of PE 3-layer by extrude method appeared to be the best in this study. However, identification of other wrapping materials requires further additional tests.