• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제5B권2호
• /
• pp.154-161
• /
• 2005

In the machine tool industry, direct drive linear motor technology is an interesting means to achieve high acceleration, and to increase reliability. This paper analyzes and compares the characteristics of a tubular linear motor with Halbach and radial magnet array, respectively. First, the governing equations are established analytically in terms of the magnetic vector potential and two dimensional cylindrical coordinate systems. Then, we derive magnetic field solutions due to the PMs and the currents. Motor thrust, flux linkage and back emf are also derived. The results are shown to be in good conformity with those obtained from the commonly used finite element method. Finally, control parameters are obtained from analytical solutions.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
• /
• pp.107-107
• /
• 2012

Recently, large-area synthesis of high-quality but polycrystalline graphene has been advanced as a scalable route to applications including electronic devices. The presence of grain boundaries (GBs) may be detrimental on some electronic, thermal, and mechanical properties of graphene, including reduced electronic mobility, lower thermal conductivity, and reduced ultimate mechanical strength, yet on the other hand, GBs might be beneficially exploited via controlled GB engineering. The study of graphene grains and their boundary is therefore critical for a complete understanding of this interesting material and for enabling diverse applications. I present that scanning electron diffraction in STEM mode makes possible fast and direct identification of GBs. We also demonstrate that dark field TEM imaging techniques allow facile GB imaging for high-angle tilt GBs in graphene. GB mapping is systematically carried out on large-area graphene samples via these complementary techniques. The study of the detailed atomic structure at a GB in suspended graphene uses aberration-corrected atomic resolution TEM at a low kV.

• 대한수학회지
• /
• 제40권5호
• /
• pp.901-920
• /
• 2003

The notion of infinitely near singular points, classical in the case of plane curves, has been generalized to higher dimensions in my earlier articles ([5], [6], [7]). There, some basic techniques were developed, notably the three technical theorems which were Differentiation Theorem, Numerical Exponent Theorem and Ambient Reduction Theorem [7]. In this paper, using those results, we will prove the Finite Presentation Theorem, which the auther believes is the first of the most important milestones in the general theory of infinitely near singular points. The presentation is in terms of a finitely generated graded algebra which describes the total aggregate of the trees of infinitely near singular points. The totality is a priori very complex and intricate, including all possible successions of permissible blowing-ups toward the reduction of singularities. The theorem will be proven for singular data on an ambient algebraic shceme, regular and of finite type over any perfect field of any characteristics. Very interesting but not yet apparent connections are expected with many such works as ([1], [8]).

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2009년도 추계학술대회 논문집
• /
• pp.54-54
• /
• 2009

AFM anodic oxidation has the capability of patterning complex nano-patterns under relatively high speeds and low voltage. We report the fabrication using a atomic force microscopy (AFM) of silicon nano-ribbon and nano-field effect transistors (FETs). The fabricated nano-patterns have great potential characteristics in various fields due to their interesting electronic, optical and other profiles. The results shows that oxide width and the separation between the oxide patterns can be optimally controlled. The subsequently fabricated silicon nano-ribbon and nano-FET working devices were controled by various tip-sample bias-voltages and scan speed of AFM anodic oxidation. The results may be applied for highly integration circuits and sensitive optical sensor applications.

• 충청수학회지
• /
• 제23권1호
• /
• pp.91-98
• /
• 2010

One of the most interesting classes of algebraic codes is the class of quadratic residue (QR) codes over a finite field. A natural construction doubling the lengths of QR codes seems to be the double circulant constructions based on quadratic residues given by Karlin, Pless, Gaborit, et. al. In this paper we define a class of triple circulant linear codes based on quadratic residues. We construct many new optimal codes or codes with the highest known parameters using this construction. In particular, we find the first example of a ternary [58, 20, 20] code, which improves the previously known highest minimum distance of any ternary [58, 20] codes.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.1153-1156
• /
• 2005

We propose the RSS Channel retrieval system to activate the blog information transmission. The system consists of a web crawler and blog DB. Web Crawler moves in limited breath first searching method and it collects the RSS Channel Address. Blog DB renews information using RSS. The user could be recommended the RSS Channel using the various query.

• 한국생물공학회:학술대회논문집
• /
• 한국생물공학회 2001년도 추계학술발표대회
• /
• pp.374-377
• /
• 2001

답토에서 분리한 균주는 Candida sp. HY200이라 임시 명명하였고, Candida tropocalis 보다 짧은 시간에 xylose를 소모하고, 당내성이 우수하며, flocculation의 특성을 갖고 있다. 260 g/L의 고농도 xylose 배지에서 xylitol 발효는 수율 79%, 생산성 2.14 g/L ${\cdot}$ h의 결과를 얻었다.

• 한국정보교육학회:학술대회논문집
• /
• 한국정보교육학회 2005년도 하계학술대회
• /
• pp.304-313
• /
• 2005

RSS와 같은 신디케이션 기술은 사용자가 스스로 웹사이트에 접근하지 않아도, 새롭게 업데이트 되는 정보가 있을 때마다 RSS Aggregator를 통해 사용자에게 알려줌으로써 편리성을 가져다준다. 이러한 기술을 이용한다면 학습자들은 새로운 웹 문서가 게시될 때마다 해당 사이트를 방문할 필요 없이, 자동으로 신규 정보만 얻어오는 학습 자료의 습득 도구로서 활용이 가능하다. 하지만, 정의가 새롭게 추가되는 여부만을 판단하는 기존의 RSS Aggregator의 경우에 등록된 채널수가 늘어갈수록 사용자는 자신이 원하는 정보를 찾기 위해, 정보를 분류하고 검색하는 작업에 많은 노력을 기울여야한다. 본 논문에서는 이러한 문제점을 해결하고 사용자에게 의다 효율적인 정보 전달을 위해, 사용자 스스로 관심분야를 생성하여, 사용자에게 전달되는 신규자료는 각 분야에 자동적으로 분류되며, 사용자가 지정해 놓은 조건에 적합하도록 콘텐츠를 제공 받을 수 있는 시스템을 설계하였다. 신규자료를 분야에 자동적으로 분류하기 위해 초기 분류된 문서로부터 분야별 색인어 추출 방안을 제안하고자 한다.

• 한국경영정보학회:학술대회논문집
• /
• 한국경영정보학회 2008년도 춘계학술대회
• /
• pp.264-269
• /
• 2008

Considering our increasingly interconnected organizations heavily relying on business processes and the growing need for timely accurate knowledge to achieve greater agility in the enterprise, the idea of looking at business processes as a knowledge object is gaining momentum. Business process information is knowledge and should consequently be managed as a valuable organizational asset, particularly because organizations need to react in near real time to environmental changes and events. This paper provides an overview of the situation in this field arguing for a better definition of the intersections between knowledge and business process management. When business process is seen as knowledge, it should be managed as such. We assess and discuss some of the resulting benefits and considering the need for greater dynamic integration between the two domains, we look at ontologies as an interesting technical approach to bridging this gap showing an example for an ontology based sales order process.

• 대한교통학회지
• /
• 제14권3호
• /
• pp.7-26
• /
• 1996

The estimation of real-time Origin-Destination(O-D) parameters, which gives travel demand between combinations of origin and destination points on a urban freeway network, from on-line surveillance traffic data is essential in developing an efficient ATMS strategy. On this need a real-time O-D parameter estimation model is formulated as a parameter adaptive filtering model based on the extended Kalman Filter. A Monte Carlo test have shown that the estimation of time-varying O-D parameter is possible using only traffic counts. Tests with field data produced the interesting finding that off-ramp volume predictions generated using a constant freeway O-D matrix was replaced by real-time estimates generated using the parameter adaptive filter.