• Computational Structural Engineering
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• v.28 no.4
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• pp.38-48
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• 2015

• Proceedings of the Korea Society of Design Studies Conference
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• 1999.10a
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• pp.90-91
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• 1999

산업디자인을 행하는 디자이너는 프리랜서이건 기업의 디자이너이건 간에 누군가를 위해 디자인을 하게 된다. 물론 디자이너 스스로 제품의 생산판매까지를 담당하는 경우는 드물기도 하지만 제외하고서. 기업의 디자이너는 경영자에게, 프리랜서라면 클라이언트에게 자신의 디자인을 프리젠테이션하게 되고 그것을 통해 자신의 디자인이 받아들여 지도록 경영자 혹은 클라이언트를 설득해야만 한다.(중략)

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2004.09a
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• pp.201-209
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• 2004

As the European Community's Directive on the Restriction of Hazardous Substances in Electrical and Electronic Equipment banning lead (Pb) in electronics products will take effect on July 1, 2006, most electronics manufacturers will be commencing with volume production of Pb-free components by the middle of 2004. Electrodeposited pure tin finishes on electronic components are a leading contender to replace the industry standard tin-lead. Commensurate with this shift will be a somewhat steep learning curve as manufacturers adapt a variety of equipment and processes to contend with the issues surrounding this critical, industry-wide material conversion. Since the electrodeposited finish directly influences the critical reliability characteristics of the component itself, the nature of the Pb-free component finish must be well characterized and understood. Only through a thorough examination of the attributes of the electroplated tin deposit can critical decisions be made regarding component finish reliability. This paper investigates the properties of electrodeposited tin that may have an effect on component reliability, namely, grain structure (size and shape), oxide formation, tin whisker formation, and solderability. Data will be presented from laboratory and production settings, with the objective being to enable manufacturers to draw their own conclusions regarding previously established perceptions and misconceptions about electrodeposited tin properties.

• IEMEK Journal of Embedded Systems and Applications
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• v.12 no.5
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• pp.319-330
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• 2017

In remote USV (Unmanned Surface Vehicle) maritime operation, the remote operation and control technic and autonomous control technic is required and the emergency mode algorithm is needed certainly for sailing and accomplishing various surveillance, reconnaissance, and underwater search missions of USV. In this paper, we review the countermeasures in emergency situation of the existing USV system (Barracuda) and propose the emergency mode algorithm considering the operation and control, and autonomous control level for the stable USV operation in case of emergency. We analyzed the autonomous control level in view of the mission complexity and environmental difficulty, and human interface, and verified the performance of the autonomous control level when we apply four emergency mode algorithms. It is expected that more stable and reliable operation and cotrol are possible if the proposed algorithm is applied to the environments requiring the various multi-mission USV sailing and mission achievement.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.11
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• pp.1443-1445
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• 2016

In this paper, we propose a exclusive-OR TCP coding technic imply with TCP Hybla on split PEP for enhancing the file transfer speed of the satellite communication. To evaluate performance of the proposed method, we set up a test-bed of satellite communication network. As a result of the performance evaluation, the file transmission speed enhanced more than 12% within high packet loss range. Therefore, we can expect that the proposed methodology could contribute to enhancing of data transmission speed in the satellite communication.

• Journal of the Korean Institute of Landscape Architecture
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• v.19 no.1
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• pp.61-80
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• 1991

The purpose of this study is to present the design method to embody the cultural heritage and to reproduce the image of Korean Traditional Garden these days. For this purpose, to begin with, the major elements which can be applied to the planning and design were extracted by to study on the prototype of Korean Traditional Garden, and the process and the outcome for reconstruction of traditional garden were presented by design proposal for the Korean Garden in the exhibition space of EXPO '90, the International Garden and Greenary Exposition, Osaka, Japan, 1990. The study on the prototype of Korean Garden is focused on the spatial organization, the facilities allocation, and the gardening technic of traditional garden, and the major contents of the case study are as follow ; (1) To investigate the constraints and the opportunities of site development by the analysis and the synthesis of the site condition for the case study, (2) To study on the planning technic which can be applied to the site, (3) To establish the planning models which can be introduced into the site and to choose the final model by the comparison and valuation of them, (4) To set up the Master Plan on the basis of the final model. In spite of the fact that the method and the contents have a lot of problems, the significance of this study is to present a possibility to reproduce the Korean Traditional Garden these days, moreover to grope for the opportunities to propagate it internationally.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.27 no.2
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• pp.204-212
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• 2017

The rotor dynamics and balancing technic for rotating equipment during engineering and manufacture stage are to be carefully considered in order to minimize the operation troubles regarding vibration during commissioning stage. In this paper, the test rig, which includes the disks as balancing plane, is designed and manufactured, so that the characteristic of rotor dynamics can be analyzed such as critical speed and mode shape. The critical speed predicted through natural frequency analysis is verified by the actual measurement on bearing housing vibration during start-up condition of test rig. The low speed balancing and the operating speed balancing test are performed respectively with consideration of first critical speed, and the residual unbalance amounts are estimated in accordance with the relevant method described in API standard. In addition, the single and dual plane balancing are carried out on main disk and trim disk depended on phase information at each balancing step.

• Current Photovoltaic Research
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• v.3 no.2
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• pp.61-64
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• 2015

In solar industry, numerous researchers reported about cold spray method among various electrode formation technic, but there are no known a bonding mechanism of metal powder. In this study, a cross-section of copper electrode formed by cold spray method was observed and heterogeneous phase between silicon substrate and copper electrode was analyzed using morphology observation technic. SEM and TEM analysis were performed to analyze a crystallinity and distribution shape of heterogeneous copper phase. Molecular dynamics simulation was performed to calculate glass transition temperature of copper metal. In the result, amorphous copper phase was observed near interface between silicon substrate and metal electrode. The results of the molecular dynamics simulation show that an amorphous copper phase could be formed at a temperature below the melting point of copper because cold spraying resulted in a lower glass transition temperature.

• The Journal of the Korea Contents Association
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• v.10 no.8
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• pp.66-72
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• 2010

This paper is focus on 3D virtual building design technic that construction materials are showed by components and these components are part of patterns, and building design using pattern is possible. To use this technique in process of construction, design, analysis, change, assembly, etc, we will develop flexible building design system that it supports efficient building change and low cost by construction design simulation. Specially also the designer and the user use a pattern and easily will be able to change the building and according to change pattern information of the materials, design of the buildings which are changed creates automatic. Also we will implement knowledge retrieval engine which is necessary to personal skill or visualization.

• Journal of Korean Ophthalmic Optics Society
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• v.4 no.2
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• pp.105-111
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• 1999

This paper presents experimental results on the electrical properties of hydrogenated amorphous carbon films(a-C:H) prepared by PECVD. DC conductance of a-C:H was measured as a function of temperatures in the range of 100 to 423K. We studied two a-C:H films: one was well explained by the Mott's Variable Range Hopping(VRH) rule, but the other sample did not follow it. However, the conduction data of second sample were well fitted to Shimakawa's Multi-Phonon Hopping(MPH) model according to which conductivity is proportional to $T^M$ with m=15-17. but, in our samples, m was 10-12. Also a-C:H showed several bias effects like relaxation of conductance, bias-dependent conductance and the change of conductance slope in 1n(${\sigma}{\sqrt{T}}$) vs. $T^{1/4}$ plot. In this study we interpret these data by bias-dependent detrapping model.