• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.1
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• pp.97-101
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• 2011

Quad band p-HEMT SP6T switch for handset applications was developed. To achieve the low insertion loss and high isolation, trade-off between "On" state and "Off" state was considered by optimization of unit cell. Especially, in case isolation between transmit port and receive port, it was achieved by large capacitors and miniaturization of chip size was achieved by common voltage control and ground using back via process. Designed SP6T switch has size of $950um{\times}100um$ and take into consideration the gate recess error, excellent loss and isolation was confirmed in operating frequency.

• The Research Journal of the Costume Culture
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• v.18 no.6
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• pp.1254-1260
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• 2010

In such special or precious occasions as a wedding ceremony, brides, handicapped or not, wish to wear a beautiful wedding dress. However, an ordinary wedding dress is not suitable nor convenient to a bride who has a bodily impediment. A one-piece type wedding dress, which even a normal bride needs assistants to help her wear, will create more inconvenience to crippled females. In this connection, this study is purposed to convert a normal ready-made wedding dress design into one suitable to the bodily handicapped females. For handicapped people on a wheelchair who generally put on and off a wedding dress while sitting on the chair, a one-piece type wedding dress is divided into the top and the skirt to make it a two-piece type wedding dress which is easy to get into and take off. The top should be separated from the skirt in such a manner that the wearer may not be aware of the division of the two pieces but easily put on and off since the sides or back of the top is opened. An opening is also given to the sides of the skirt so that handicapped people may sit on the skirt on the chair and then close the opening by themselves. Converting ready-made wedding dress design into functional clothes for handicapped people is really significant in that ready-made clothes can be recycled, their production cost reduced, and the economic burden of handicapped people relieved.

• International Journal of Contents
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• v.5 no.1
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• pp.51-55
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• 2009

In this paper, we present a structure of personalized e-Learning system to study for a test formalized by uniform multiple-choice using on/off line mixed estimations as is the case of Driver :s License Test in Korea. Using the system a candidate can study toward the license through the Internet (and/or mobile instruments) within the personalized concept based on IRT(item response theory). The system accurately estimates user's ability parameter and dynamically offers optimal evaluation problems and learning contents according to the estimated ability so that the user can take possession of the license in shorter time. In order to establish the personalized e-Learning concepts, we build up 3 databases and 2 agents in this system. Content DB maintains learning contents for studying toward the license as the shape of objects separated by concept-unit. Item-bank DB manages items with their parameters such as difficulties, discriminations, and guessing factors, which are firmly related to the learning contents in Content DB through the concept of object parameters. User profile DB maintains users' status information, item responses, and ability parameters. With these DB formations, Interface agent processes user ID, password, status information, and various queries generated by learners. In addition, it hooks up user's item response with Selection & Feedback agent. On the other hand, Selection & Feedback agent offers problems and content objects according to the corresponding user's ability parameter, and re-estimates the ability parameter to activate dynamic personalized learning situation and so forth.

• Journal of Hydrogen and New Energy
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• v.33 no.3
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• pp.247-254
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• 2022

Slush hydrogen containing liquid and solid hydrogen is expected to achieve zero boil-off by suppressing boil-off gas because heat of fusion for solid absorbe the heat ingress from atmosphere. In this paper, quantitative analysis on storage cost considering specific energy consumption between 1,000 m³ class liquid hydrogen storage system with re-liquefaction and slush hydrogen storage system during equivalent zero boil off period. Even though approximately 50% of total storage capacity should be converted into solid phase during the initial cargo bunkering, total energy consumption to convert into slush hydrogen is relatively 25% less than re-liquefaction energy for boil off hydrogen during zero boil off period. That's because energy consumption of slush phase change take up only 1.8% of liquefaction energy. moreover, annual revenue requirement including CAPEX, OPEX and electric cost for slush hydrogen storage could be more reduced approximately 32.5% than those of liquid hydrogen storage and specific energy storage cost ($/kg-H₂) could also be lowered by about 41.7% compared with liquid hydrogen storage.

• Proceedings of the Korean Society for Quality Management Conference
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• 1998.11a
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• pp.659-664
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• 1998

Even though advocates of TQM emphasize the role of TQM more than before, the interest of general public have decreased in recent years. A few months ago, the Fortune introduced a survey result showing that management tools (including TQM) are to some extent fashion items, becoming chic or declasse with the march of the management zeitgeist. According to the article, TQM has cooled off and other approaches have risen to take the place. Is TQM a really dying fad? This paper discusses the problem.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1999.06a
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• pp.53-60
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• 1999

As the flying height decreased, it is essential that hard disk drives perform reliable under various environmental conditions. In this paper the tribological characteristics of a head/disk interface are investigated under various temperature, relative humidity, altitude and outgas conditions. Specially, Contact-Start-Stop(CSS) tests were performed to assess the stiction, acoustic emission, slider take-off behavior, and track average amplitude(TAA). It is shown that the surface damage and head failure are accelerated by high temperature and humidity as well as low ambient pressure.

• The Magazine for Energy Service Companies
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• s.13
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• pp.26-29
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• 2001

네오정보시스템(대표 고재형)은 운전면허기능 온라인채점기(경찰청 등록 1호)로 국내 시장의 $80\%$를 장악하고 있는 ㈜네오텔레콤에서 지난해 1월 분사한 신생회사이다. 사내 연구인력이 자체 개발한 조명절전기(Neo Energy Saver)를 가지고 2000년 12월 에너지절약투자시장에 뛰어든 이 회사는 신생 ESCO로서 무리하지 않으면서 착실히 ESCO사업을 전개해 나가고 있다. 올 한 해가 시범적용의 탐색기였다면 내년부터는 본격 이륙기(Take-Off)가 될 것이라고 장담하고 있는 네오정보시스템의 에너지사업본부를 찾아가 본다.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.577-580
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• 1998

This paper presents the characteristics of each MOS device and Bipolar device, then investigates about how these devices take effect on BiCMOS inverter from 300K to 470K. The turn-off and Logic swing characteristics of BiCMOS inverter are degraded by the electrical characteristics of the MOS to around 400K, but over that temperature enhanced by the characteristics of the Bipolar transistor.

• Aerospace Industry
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• s.108
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• pp.66-67
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• 2010

수직이착륙, 영어로는 VTOL(Vertical Take-Off and Landing)이라 불리는 기술은 공기역학을 거부한 첨단 항공우주기술이다. 일반적으로 고정익 항공기는 날개에서 발생하는 양력으로 하늘을 날지만 VTOL 항공기는 순수한 엔진 추력만으로 수직으로 이착륙하거나 단거리에서 이륙할 수 있다. 다만 높은 기술적 완성도를 요구하는 만큼 현재까지 실전 배치된 군용기 중 이 기술이 적용된 군용기는 해리어(Harrier)와 V-22 오스프리(Osprey), Yak-38 정도가 고작이다. 수직이착륙 기술에 대해 소개한다.

• Proceedings of the Korean Nuclear Society Conference
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• 2003.05a
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• pp.120-120
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• 2003