• 한국초전도ㆍ저온공학회논문지
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• 제18권4호
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• pp.25-29
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• 2016

The high temperature superconducting (HTS) contra-rotating propulsion (CRP) systems comprise two coaxial propellers sited on behind the other and rotate in opposite directions. They have the hydrodynamic advantage of recovering the slipstream rotational energy which would otherwise be lost to a conventional single-screw system. However, the cooling systems used for HTS CRP system need a high cooling power enough to maintain a low temperature of 2G HTS material operating at liquid neon (LNe) temperature (24.5 - 27 K). In this paper, a single thermo-syphon cooling approach using a Gifford-McMahon (G-M) cryo-cooler is presented. First, an optimal thermal design of a 1.5 MW HTS motor was conducted varying to different types of commercial 2G HTS tapes. Then, a mono-cryogenic cooling system for an integration of two 1.5 MW HTS motors will be designed and analyzed. Finally, the 3D finite element analysis (FEA) simulation of thermal characteristics was also performed.

• 대한전자공학회논문지
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• 제18권5호
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• pp.35-45
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• 1981

직각 쐐기는 유전체에 평면 전자파가 입사할때 일어나는 산란파에 대한 점근해를 구하였다. 산란파는 유전체경계면으로부터 반사된 파 및 고절된 파와 유전체 끝 모서리로부터 회석된 도간면파로 구성하였다. 모서리에서 회절된 전제는 물리광학 근사법에 의한 해에 교정항을 더하여 구하였으며, 이 교정 전계는 수치 계산에 의하여 풀 수 있는 이중 급수 방정식으로부터 구하였다. 구해진 점근해의 유효성은 유전체의 상대 유전률 ε의 값이 -에 갈때와 1에 가까운 값을 가질때의 두 극한치에서 검토 되었다. ε이 작을때는 Rawlins이 구한 ε Neumann계수해의 계산 결과와 같았으며, ε이 ∞에 접근할때 모서리의 회절 패턴은 도체 모서리의 회절패턴에 접근함을 보일 수 있다.

• 한국전자파학회논문지
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• 제25권9호
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• pp.919-929
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• 2014

최근 전자기기의 활용도가 높아짐에 따라 전자기파에 대한 안정성이 요구되었다. 소형화 전자기기 및 다양한 전자부품들은 맥스웰 방정식 (Maxwell Equation)으로 해석되었으나, 복잡도가 높은 대형 구조물에 대한 전자기파 안정성이 요구되는 현시점에 맥스웰 방정식은 여러 한계점을 가지고 있다. 본 논문에서는 복잡한 대형 구조물을 확률론과 위상학적 모델링을 연동하여 해석하고자 한다. 특히, 확률론을 바탕으로 한 해석 방법인 PWB(Power Balance) Method와 BLT(Baum-Liu-Tesch) 방정식을 연동하여 대형 구조물의 주파수 응답을 풀이할 경우, 해석시간이 상당히 줄어드는 장점이 있다. 본 논문에서는 복잡한 대형구조물의 예로 이중 공진구조 내부에 PCB가 존재하는 경우를 고려해 보았다.

• 디지털융복합연구
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• 제16권2호
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• pp.27-36
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• 2018

재무적 IT 투자 효과 측정 방법들은 기업의 요구를 충족시킬 수 없었다. 그러므로, IT 투자에 대한 종합적이고 비 재무적 성과측정 모형에 대한 많은 요구가 있었다. 본 연구에서는, 이러한 요구에 부응하기 위해 기업의 업무 프로세스에 기반 한 IT 성과측정 모형을 제시하고 있다. 본 연구에서 제시된 모형은 기업의 IT목표와 전략적 조정을 측정변수로 사용하여 기업의 성과측정 모형을 제시한다. 국내 125개 기업을 IT에 대한 목표에 따라 다음과 같이 네 개의 그룹으로 분류하여 데이터를 수집하였다: "무 중심", "운영 중심", "시장 중심", "이중 중심". 분석결과를 통해서 우리는 IT에 대한 더 높은 집중(중심)을 갖고 있는 기업일수록 보다 더 높은 IT 투자 성과를 인지하고, 또한 이는 IT에 대한 기업 목표의 정도가 IT 투자의 성과를 측정하기 위한 척도가 된다는 것을 알 수 있었다.

• 한국실내디자인학회논문집
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• 제24권2호
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• pp.58-66
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• 2015

This study was conducted to determine a 'platform' as a mean of interactions between users in contemporary spatial design and network(web) and to verify the similarity between the platform and space of Rem Koolhaas, one of the leading contemporary architects of our time. A platform, referring to tangible or intangible structures designed for common use in a variety of ways, is activated by the networking effect of participants. Aided by the recent development of the IT industry encompassing computers and smart phones, the concept of platforms is extending to all areas of modern life, in general. In this study, the similarity between architectural space and platforms after reviewing the computer-related platforms, ecological features that refer to virtuous circulation, and various cases applied with platform thinking. Through this process, the platform feature of architectural platforms is defined as the 'open spatial system combined with control and freedom that acts more than one function and facilitates direct/indirect exchanges between users regardless of its type or size'. Establishing the criteria for spatial analysis based on this definition, analysis was conducted on interior design projects that were planned and conducted by Rem Koolhaas after 2000. As a result of this analysis, it was learned that Rem Koolhaas designs space using dual space structures where the extension and mixture of the user group, mixture of various functions defined by users, loose control that induces voluntary participation, community reinforcement, and inducement of accidental events, and opening and closing coexist. In addition, this design approach was found to be a design strategy similar to the concept of platforms that began to be developed in the IT field.

• 복식
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• 제42권
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• pp.91-112
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• 1999

This study mainly focuses on the dissatisfaction of the post-purchase behavior regarding the consumer dissatisfaction complaining behavior and repurchase intention In the literature study approach it was hypothe-sized that dissatisfaction variables was consisted of the cognitive process and emotion. And the dissatisfaction variables and the individual vari-ables and situational variables were set up to contribute to form the complaining behavior. In the process of the complaining behavior the first thing the consumers would do when they would seek for redress or not. Consumers who sought redress and actually received the fair treatment from a store practiced positive word-of-mouth. However consumers who received unfair treat-ment practived negative word-of-mouth exit behavior or the third party complaining Behavior. And consumers who did not seek any redress either showed exit behavior practiced negative word-of-mouth or no complaining behavior at all. Therefore. complaining behavior process consists of redress seeking process and non-redress seeking process. For the empirical study the survey method was used and two other researches were previously conducted. First of all the research was designed to comprehend consumer complaining behaviors process Secondly it was conducted for measuring validity and reliability: Cronbach's q. The sqmple was 569 women aged 2-'s to 5-'s living in Seoul and other suburban areas. The various methods were used to analyze the date such as frequency, percentage and multiple regression analysis. Overall the results were verified. 1) The dissatisfaction variables and individual variables influenced situational variables. 2) The complaining behavior intention was affected by dissatisfaction variables indivi-dual variables and situational variables. 3) The repurchase intention occurred more when the justice was performed Consequently the complaining behavior proce-dure was consisted of the redress seeking and non-redress seeking. And dissatisfaction vari-ables and individual variables were verified to influnce situational variables. These complaining behavior variables affected complaining behavior Especially in a case of redress seeking process complaining behavior and repurchase rate were highly affected by the perceived justice from a store.

• Asian-Australasian Journal of Animal Sciences
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• 제29권12호
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• pp.1675-1681
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• 2016

The aim of this study was to detect positional candidate genes located within the support interval (SI) regions based on the results of red blood cell, mean corpuscular volume (MCV), and mean corpuscular hemoglobin quantitative trait locus (QTL) in Sus scrofa chromosome 13, and to verify the correlation between specific single-nucleotide polymorphisms (SNPs) located in the exonic region of the positional candidate gene and the three genetic traits. The flanking markers of the three QTL SI regions are SW38 and S0215. Within the QTL SI regions, 44 genes were located, and runt-related transcription factor 1, dual-specificity tyrosine-(Y)-phosphorylation regulated kinase 1A (DYRK1A), and potassium inwardly-rectifying channel, subfamily J, member 15 KCNJ15-which are reported to be related to the hematological traits and clinical features of Down syndrome-were selected as positional candidate genes. The ten SNPs located in the exonic region of the three genes were detected by next generation sequencing. A total of 1,232 pigs of an $F_2$ resource population between Landrace and Korean native pigs were genotyped. To investigate the effects of the three genes on each genotype, a mixed-effect model which is the considering family structure model was used to evaluate the associations between the SNPs and three genetic traits in the $F_2$ intercross population. Among them, the MCV level was highly significant (nominal $p=9.8{\times}10^{-9}$) in association with the DYRK1A-SNP1 (c.2989 G$F_2$ intercross, our approach has limited power to distinguish one particular positional candidate gene from a QTL region.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.294-297
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• 2007

Steam and advection fogs are frequently observed in the Yellow Sea located between Korea and China during the periods of March-April and June-July respectively. This study uses the remote sensing (RS) data for monitoring sea fog. Meteorological data obtained from the Ieodo Ocean Research Station provided an informative synopsis for the occurrence of steam and advection fogs through a ground truth. The RS data used in this study was GOES-9, MTSAT-1R images and QuikSCAT wind data. A dual channel difference (DCD) approach using IR and near-IR channel of GOES-9 and MTSAT-1R satellites was applied to estimate the extension of the sea fog. For the days examined, it was found that not only the DCD but also the texture-related measurement and the weak wind condition are required to separate the sea fog from the low cloud. The QuikSCAT wind is used to provide a weak wind area less than threshold under stable condition of the surface wind around a fog event. The Laplacian computation for a measurement of the homogeneity was designed. A new combined method of DCD, QuikSCAT wind speed and Laplacian was applied in the twelve cases with GOES-9 and MTSAT-1R. The threshold values for DCD, QuikSCAT wind speed and Laplacian are -2.0 K, 8 m $s^{-1}$ and 0.1, respectively. The validation methods such as Heidke skill score, probability of detection, probability of false detection, true skill score and odds ratio show that the new combined method improves the detection of sea fog rather than DCD method.

• 인터넷정보학회논문지
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• 제8권4호
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• pp.93-103
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• 2007

네트워크 환경은 외부의 침입으로부터 항상 노출되어 있으며 프라이버시 보장에도 위험이 따른다. 전파 송신을 통한 브로드캐스트의 속성 때문에 무선기기들은 유선 네트워크에 연결된 통신기기보다 더 많은 위험 상황을 경험하게 된다. 본 논문은 무선통신 기기가 두 개의 통신채널을 장착하고 있다고 가장한다. 하나는 3G서비스를 통해 인터넷을 접속하는데 사용되며 다른 하나는 애드 혹 네트워크를 구성하여 익명의 통신 서비스를 제공하는데 사용된다. 프라이버시 위험을 극복하기 위해 본 논문에서는 무선기기들이 애드 혹 네트워크를 구성해 익명 통신채널을 구축하여 이를 이용해 자료를 교환하는 방법을 소개한다. 익명 통신채널을 구축하기 위해서는 하나 이상의 무선기기가 익명 채널의 경로에 참여해야 한다. 제안한 익명 통신방법은 트래픽 분석을 어렵게 하며 사용자의 프라이버시를 향상시킨다. 모의실험 결과에 따르면, 애드 혹 네트워크에서 익명성을 제공하는 통신은 송신자나 수신자 근처에 있는 중간 무선기기를 선택하여 익명 채널의 경로로 선택하는 것이 무작위로 중간 무선기기를 선택하는 방식보다 좋은 성능을 보였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1998년도 Proceedings of International Workshop on Advanced Image Technology
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• pp.92-97
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• 1998

For the efficient searching and browsing of digital video, it is essential to extract the internal structure of the video contents. As an example, a news video consists of several sections such as politics, economics, sports and others, and also each section consists of individual topics. With this information in hand, users can ore easily access the required video frames. This paper addresses the problem of automatic shot boundary detection and selection of representative frames (R-frames), which are the essential step in recognizing the internal structure of video contents. In the shot boundary detection, a new algorithm that have dual detectors which are designed specifically for the abrupt boundaries (cuts) and gradually changing bounaries respectively is proposed. Compared to the existing 미algorithms that mostly have tried to detect both types by a single mechanism, the proposed algorithm is proved to be more robust and accurate. Also in the problem of R-frame selection, simple mechanical approaches such as selecting one frame every other second have been adopted. However this approach often selects too many R-frames in static short, while drops important frames in dynamic shots. To improve the selection mechanism, a new R-frame selection algorithm that uses motion information extracted from pixel difference is proposed.