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        DVB-RCS2 기반 차세대 군 위성 네트워크 랜덤 액세스 채널 적응형 제어 기법

        이원균,장대희,정종문 한국인터넷정보학회 2020 인터넷정보학회논문지 Vol.21 No.2

        In this paper, we analyze the most suitable RA method among PAMA, DAMA, and RA classified by the multiple access method of satellite communication in the rapidly changing traffic environment according to the emergency and tactical situation. It suggests an alternative to improve the limit of output degradation. Based on the CRDSA protocol selected as the standard of DVB-RCS2 among the current satellite communication methods, CRDSA2R (Contention) maintains an optimal RA channel environment by checking the limitations in an environment where packet volume is rapidly increasing and observing channel load and channel conditions. We propose a Resolution Diversity Slotted ALOHA with Adaptive Random Access. 본 논문에서는 비상대비 상황에서 위성통신의 Multiple Access 방식으로 구분되는 PAMA, DAMA, RA 중에서 전술상황에 따라 트래픽이 급변하는 환경에서 가장 적합한 RA 방식에 대해 분석하고, RA 방식이 트래픽 급증 시 충돌로 인한 재전송이 발생하여 출력 저하가 나타나는 한계점을 개선하기 위한 대안을 제시한다. 현재 위성통신 방식 중 DVB-RCS2의 표준으로 선정된 CRDSA 프로토콜을 예시로 하여 패킷양이 급증하는 환경에서 가지는 한계점을 확인하고 채널 로드와 채널 상태를 관찰하여 최적의 RA 채널 환경을 유지하는 CRDSA2R(Contention Resolution Diversity Slotted ALOHA with Adaptive Random access) 기법을 제안한다.

      • 朝鮮 中宗朝 臺諫의 交遞實態

        李源鈞 釜山水産大學校 1985 論文集 Vol.35 No.-

        The purpose of this thesis is to examine roughly how Dae Gan(臺諫) in the times of King Jung Jong-a government official attached to SA Hon Bu(司憲府) and Sa Gan Won(司諫院)-was actually replaced on the basis of an Authentic Record of King Jung Jong (中宗實錄). The conclusion resulted from here is summarized as follows: (1) Dae Gan of the Choson Dynasty was too often replaced from the times of King Jung Jong on. (2) The reason Dae Gan was so often replaced was that he not only quitted his office on the charge of trivial misdemeanors but he himself let his fellow Dae Gan resign from the position so that he might maintain his dignity and grace. (3) The repeated replacement of Dae Gan frequently brought an effect on that of government officials attached to other ministerial institutions in those days

      • LUC 구조를 이용한 윌킨슨 전력분배기 설계

        이원균,황희용 강원대학교 정보통신연구소 2008 정보통신논문지 Vol.12 No.-

        In this paper, the exact analysis of the LUC(Lowpass filter Unit Cell) and application to Wilkinson power divider are presented. The Z-parameter of LUC is derived. The structure of LUC shows wide stop band and sharp skirt characteristics. Using the characteristics we designed a miniaturized Wilkinson power divider with wide harmonic-suppressed band. The size of the proposed Wilkinson power divider is 10% smaller then the conventional Wilkinson power divider. The frequency response is the same with that of the conventional ones on near 2.45 GHz center frequency. Including the fifth harmonics, up to 13 GHz spurious responses are suppressed below to -18 dB.

      • 企業失敗 豫測모델과 財務困境의 進行過程에 관한 연구

        李源均 慶一大學校 1989 論文集 Vol.5 No.1

        It is desirable to have a system that can reliably identify firms with potentially serious financial problems. Such a warning system will enable various interest groups to terminate their relationships with a firm before the firm’s financial distress becomes apparent. A number of earlier studies have focused on predicting business failure, instead of financial distress. The researches used financial ratios to predict failure can be divided into two groups; the univerate and multivariate studies. The first group is concerned with the predictive ability of individual financial ratios, whereas the second group is more concerned with preformance of several ratios combined together to predict failure. Two multivariate studies used are multiple discriminant analysis(MDA), and multionmial logit analysis(MLA). The four aspects of the previous studies on predicting financial difficulty that require improvement are as follow; (1) narrow definition of failure, (2) lack of theoretical framework for selecting explanatorv variables, (3) fitfalls in MDA study, and (4) weakness in data collection. There should be a continuum of failing events which leads up to liquidation. Events on the continuum include the omission of common and preferred dividends, defaulting on interest and principal payments, and filing petition to the count. All of the previous studies have focused on only the last stage on this continuum. This narrow definition of failure leads to the restricted populationsize used in their studies. Generally, a firm is thought to be in financial distress if it intentionally takes some financial actions resulting in monetary losess to external parties. Thus, a firm is viewed as in financial distress if it has entered into one of the following states; (1) omitting or reducing annual dividend payments, (2) technical defaulting and defaulting on loan interest and principal payments, (3) filing protection under bankruptcyact, and (4) declaring bankruptcy or liquidation. Typically, a firm does not suddenly or unexpectedly become bankrupt. Instead, it passes through into three stages; (1) incubation period, (2) period of deficit funds-flow, and (3) period of financial distress or financial recovery.

      • Simulation-Based Energy Usage Profiling of Machine Tool at the Component Level

        이원균,이찬영,민병권 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.3

        This paper describes a virtual machine tool (VMT) that can be used to estimate the energy consumption of machine tools at the component level. The VMT was designed by focusing on accurately estimating the dynamic behavior and energy consumption of the servo system, which has a major impact on the total energy consumption. Simulation models of the controller and feed drive were constructed. The energy consumption levels of the feed drive components were analyzed theoretically and integrated into the model. An experimental setup of the servo system incorporating a hardware-in-the-loop simulation testbed was constructed to evaluate the proposed model. Simplified models of the spindle, auxiliary units, and cutting dynamics were included in the VMT to estimate the energy consumption of the machine tool components during milling. This simulation technique was used to quantify the effects of machine tool design modification and process control and to simulate the relationship between the specific energy consumption and the material removal rate in order to reduce the overall energy consumption.

      • 불상광배(光背)에 나타난 문양(紋樣)을 응용한 주얼리 디자인연구

        이원균,안일훈 가야대학교 2007 가야대학교 논문집 Vol.16 No.-

        Buddhism art is regarded as one of the most famous cultural inheritance in the history of world cultures as it developed various ways through more than 2,000 years. One of the main streams of Buddhism art is Budda's statue and its most beautiful decorative point is halo. This study comprehends halo's meaning from Buddhist theory and develops its figurative decoration that contributes continuous development of Buddhism art. As for works, they are wearable Buddhist personal ornaments like rings, brooches, earings, which represent Buddhist spiritual images by simplified patterns of halo. Its shape and details are based on Buddhist halo and focused on decorative, practical purpose that can be recognized as modern Buddhist art piece, also strengthen a sense of Buddhism. This study is not only using traditional Buddhist patterns but also understanding Buddha's real to the users meaning of great mercy and compassionand implicate this to the works so help to cultivation of the buddhist mind.

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