이동 애드 혹 네트워크에서의 환경적응형 QoS AODV 라우팅 프로토콜에 관한 연구

裵振勝,宋東勳,吳世德,鄭燦赫,金玄郁,李光培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance vector routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end points is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average data reception rate. At that time, we used evaluation parameters such as node's mobility-stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.293%, 15.914%, 17.238% for 300 mobility-stop second case and 4.809%, 4.264%, 2.956% for 300 mobility-stop second case.

무선 애드 혹 기반 액티브네트워크상에서 QoS지원에 관한 연구

李基源,裵振勝,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - In this thesis, we propose a QoS supporting method on wireless ad hoc-based active network for improving reliability. On the loss of route path, the existing DSR routing protocol has several problems with wireless network communication because of decease of data reception rate and increase of network load. The proposed method improves reliability of data transfer by using functions of active network. That is, by using functions of active nodes and active packets, the proposed method supports QoS with reservation transfer method that saves data packets on transfer at intermediate nodes with lost path and then re-transmit the packets after route reconfiguration.

비행시험 기법 : 스핀 SPIN

나승혁,이주하 한국항공운항학회 1994 한국항공운항학회지 Vol.2 No.-

본 연구 논문은 항공기 개발에 있어서 비행시험의 최종 단계라 할 수 있는 스핀시험의 정의, 스핀 시험방법 및 스핀 진입시의 회복방법과 실제 비행에서의 스핀 특성으로 스핀에 대한 안전성 제고 및 비행시험의 중요성을 논하였다.

X-선 산란에서 동경 성분의 분포함수에 관한 연구

임승혁,정윤근 여수대학교 1990 論文集 Vol.4 No.-

The interference function I(k), the radial distribution function(RDF) 4πr².ρ(r), and the probability function W(r)= ?? , where ρ(r) is the number of atoms per unit volume at a distance r from a reference atom and ?? is the average atomic density, can be determined from the experimentally measured X-ray scattering pattern of a liquid, amorphous or micropoly-crystalline binary alloy. The measured X-ray intensities are corrected for background, polarization and absorption which are characteristic of the diffraction geometry. The resulting corrected intensities are then normalized to an absolute scale with the normalization constants determined by the high-angle, the RDF, and the Krogh-Moe-Norman methods including the Laue monotonic scattering due to the difference in scattering factors ?? and ?? of the elements A and B in the binary alloy of concentration ?? of A atoms. The coherent scattering intensities per atom in absolute units, J ?? is the basis for the calculation of the interference function I(k): ?? where k= ?? Consisting of the measured intensities of the binary alloy, the background intensities, the atomic scattering factors and the Compton Scattering of the individual elements, we are shown the scattered intensities, ?? in electron units, the interference function I(k), the function F(k), the Fourier coefficients G(r), the radial distribution function(RDF) 4πr²ρ(r), the average atomic distribution ?? , the probability function W(r) and the coordinatio number CN= ??

Chalcopyrite 결정구조에 대한 진동모드와 고유치 및 고유벡터에 관한 연구

임승혁,정윤근 여수대학교 1995 論文集 Vol.9 No.-

We report a detailed investigation of the zone-centered phonons in chalcopyrites at ?? -point. The equations of motion of ZnSnP₂, CdSnP₂, CdSiP₂, and CdGeP₂ in chalcopyrite sturcture are formulated by using the harmonic approximation method. In this study, we got 3 acoustic and 21 optical phonons at ?? -point, the modes of 21 optical phonons are assigned by comparing with the results of group theoretical analysis. These results are agreed that ZnSnP₂is ?? (X₃) mode, CdSnP₂is ??( ?? ) mode, CdSiP₂ is ?? (X₃) mode and ??( ?? ) mode, CdSeP₂is ??( ?? ) mode and ??( ?? ) mode. These are compared with the experimental Raman shifts and Bettini's. The value of our results is very similar to Bettini's value for Raman shifts.

염산증기 흡입에 의해 발생한 화학성 폐렴 1예

장재혁,원경준,권세훈,하성일,권용은,이승일,윤성호 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

A 38-year-old man with dyspnea admitted to the emergency department after exposure to hydrochloric acid in pharmaceutical product manufacturer. Crackle was auscultated in both lung fields in initial physical examination. Chest radiograph showed consolidation and diffuse parenchymal infiltration in both lung fields. Arterial blood gas analysis showed severe hypoxia. This patient was treated by mechanical ventilation, corticosteroid, antibiotics and bronchodilators and was improved completely in a week after the admission. The authors report a rare case of chemical pneumonitis caused by hydrochloric acid.

정보통신산업에서의 기술혁신 유인과 시장구조 진화

신혁승,윤충한,한경동 한국국민경제학회 2003 경제연구 Vol.21 No.1

기술혁신 및 시장구조의 진화과정에서 효율적 기업이 계속하여 신기술을 독점하는 지배적 구조의 지속 현상(increasing dominance)과 각 기업의 기술적 우위와 계속하여 교차하는 현상(action-reaction)이 어떠한 상황에서 발생하게 되는지를 기업의 기대 종류, 기업의 초기비용 구조 등을 통해 살펴보고, 특히 정보통신산업에서 나타나는 네트워크 외부성의 존재가 기업의 기술혁신 유인과 시장구조의 진화 패턴에 미치는 영향을 고찰하고 있다. We examine the evolution of market structure by technological innovation. There are two kinds of phenomena in the evolution. One is the 'increasing dominance' where the efficient firm continues to be a leading firm. The other is the 'action-reaction' where technological superiority of firms changes over time. We derive the conditions under which these two phenomena occur. Also, we look at the effect of network externality on the pattern of the innovation incentive and market evolution.

헬리컬관외 침전 및 적하 열전달 특성에 관한 연구

황승기,윤상국,김동혁,이승갑 韓國海洋大學校 附設 海洋科學技術硏究所 2001 硏究論文集 Vol.10 No.2

An experimental study is carried out to investigate the cahracteristics of heat transfer of outside helical tubes. The main heat exchanger consists of twelve curved columns with each 300mm diameter and the total length of 1.2m copper tube having an outer diameter of 19.05mm with 1.5mm thickness. Water flows down the outside of helical tube, where flow patterns are the vertical film falling flow, immerged flow, and mixed-flow which is the combination of film falling flow and immerged flow. Refrigerant 11 flows the inside of the tub countercurrently. The experimental range of inside flow rate is 1.7∼3.2ℓ/min. The results are presented as Nusselt number with corresponding Reynolds number for variety of outside and inside flow rates. The heat transfer rates of the mixed flow are 8 to 56% higher than those of film falling flow or immerged flow only. Interpretation of the results is given on the basis of physical reasoning and the correlation equations.

톨루엔의 一回 및 反復吸入 露出이 白鼠에 미치는 影響 : 血中 濃度 및 細胞外性 아미노酸 神經傳達物質의 濃度變化 Blood concentration and extracellular amino acid neurotransmitter levels

백승경,신윤열,박용훈,이진훈,최태혁,이완구 內務部 國立科學搜査硏究所 1996 國立 科學 搜査 硏究所 年報 Vol.28 No.-

커뮤니케이션 수단으로서의 아이콘 디자인에 관한 연구

신승혁 한국디자인과학학회 2000 디자인과학연구 Vol.5 No.-

아이콘은 컴퓨터 존재물의 표시로서 인간과 컴퓨터의 인터페이스에서 효과적으로 작동한다. 사람들은 동일한 사물을 말로 표현하는 것보다 그림으로 표현한 것을 더 빨리 알아보고 이해한다. 예를 들어 심볼을 가지고 있는 교통표지판은 말로만 된 표지판보다 먼 거리에서 더 알아보기 쉽다고 여러 연구 결과는 입증하고 있다. 아이콘 인터페이스는 명령어와 같은 다른 매체들을 사용하지 않고 다른 매체들과 비교하여 같거나 아니면 더 작은 실질적인 표시 공간을 사용하면서도 더 풍부한 정보를 전달할 수 있는 아이콘을 이용하여 더 쓰기 편리한 인터페이스를 제공한다. 대화식 시스템에서 사용자는 작업을 직접 조절하려는 욕망을 지니게 된다. 사용자는 컴퓨터를 완전히 제어하여 무언가를 직접 다룬다는 성취감을 느끼며 작업을 하고 싶어함에 따라 의미전달이 잘되는 아이콘을 제작하기 위해서 다양한 아이콘에 대해 알아보고 효율적인, 컴퓨터와 사용자간의 커뮤니케이션 방법을 제시하고 문제점과 개발방법 등을 제시하고자 한다. Icon is the sign for what computer exists and efficiently works as a interface between human and computer. People can understand what is expressed by picture easier than what is expressed Just by language. For example, several research prove that the traffic signal board which has a symbol is easer to understand than the sign board expressed by language. Icon provides much more convenient interface than other imperative terms, although it never uses other mediums and uses smaller space than other imperative terms. Users tend to have a desire to control operations completely when they use computer. That's why users always try to develop various cons which are useful in communication.