122,194 research outputs found
Lim Keun-Woo
No full text학위논문(박사)--아주대학교 일반대학원 :컴퓨터공학과,2014. 2본 논문에서는 WLAN 기반 멀티 홉 네트워크에서 데이터를 보급할 때 서비스 품질 (QoS) 을 향상시키기 위한 효율적인 기술에 대해 연구한다. 스마트폰 및 이동 네트워킹 기술이 큰 발전을 이룸에 따라, 새로운 무선 네트워킹 서비스 및 어플리케이션이 대두될 것으로 기대되고 있다. 이 트랜드를 따라 WLAN 기반의 네트워킹 제품 및 디바이스가 미래 서비스를 지원하기 위한 가장 핵심 기술로 떠오르고 있다. 하지만, 기존 WLAN 환경에서의 QoS 를 지원하기 위한 연구는 미래의 다양한 서비스 및 어플리케이션이 요구하는 요구사항을 만족할 수 없다. 그렇기 때문에, WLAN 기반의 통신 기술은 미래의 다양한 서비스 지원을 위해 이러한 요구사항을 충족하고 효율적인 QoS 를 지원할 수 있는 방법을 제시하여야 한다.
본 논문에서는 WLAN 기반 멀티 홉 네트워킹 환경의 다양한 미래 시나리오 및 사용 예시를 분석하고 이러한 환경에서 발생할 수 있는 문제점을 분석한다. 또한, 이러한 문제점을 해결하기 위하여 새로운 기술을 제시하고, 성능 분석을 통해 해당 기술들이 미래 다양한 WLAN 기반 서비스의 효율성을 높일 수 있다는 것을 증명한다. 특히 QoS 향상을 위한 다음 3가지 기술에 초점을 맞춘다: 1) 차량 통신 시스템에서의 QoS 향상 기술, 2) 실시간 멀티미디어 감시 시스템 기술, 3) 에너지 효율적인 QoS 향상 기술. 각각의 QoS 향상 기술은 WLAN 기반 멀티 홉 네트워킹 환경에서 요구하는 다양한 요구 사항에 맞춰 서비스 품질을 향상시킬 수 있을 것이라 기대된다.CHAPTER I INTRODUCTION
I.A Contributions of this Thesis
I.B Overview of the Thesis
CHAPTER II BACKGROUND AND RELATED WORK
II.A IEEE 802.11 WLAN standard
III.A.1 Service Differentiation
III.A.2 Multi-hop routing
III.A.3 Mobility Management
III.A.4 Wi-Fi Direct for mobile D2D communication
II.B Taxonomy of QoS in WLAN based networks
II.C Work on Ensuring Mobile Reliability
II.C.1 Related Work on Fast Handover
II.C.2 Related Work on Mobile Data Provisioning
II.D Work on WLAN Access Control
II.D.1 Related Work on Rate Control
II.D.2 Related Work on Multi-hop Flow Control
II.D.3 Related Work on Admission Control
II.E Work on Service Differentiation
II.E.1 Related Work on Queue-based Service Differentiation
II.E.2 Related Work on Station-based Service Differentiation
II.F Design Considerations for enhancing QoS in future services
CHAPTER III QOS-ENHANCED DATA HARVESTING IN VEHICULAR NETWORKS
III.A Background
III.B Proposed Scheme
III.B.1 Scheme 1: Multi-hop Data Harvesting with Replicas (MDH-R)
III.B.2 Scheme 2: Multi-hop Data Harvesting with Replicas and Aggregation (MDH-RA)
III.C Performance Evaluation
III.C.1 Simulation Environments
III.C.2 Simulation Results of MDH-R
III.C.3 Simulation Results of MDH-RA
III.D Chapter Summary
CHAPTER IV REAL-TIME DATA DISSEMINATION IN WLAN MESH NETWORKS
IV.A Background
IV.B Proposed Scheme
IV.B.1 Adaptive Mesh Network Architecture
IV.B.2 Multi-Gateway Route Selection
IV.B.3 Congestion Prediction
IV.B.4 Congestion Avoidance
IV.B.5 Routing Loop Prevention
IV.B.6 Example of MGR-CA Operation
IV.C Performance Evaluation
IV.C.1 Testbed Implementation
IV.C.2 Simulation Results
IV.D Chapter Summary
CHAPTER V POWER-EFFICIENT QOS IN WLAN BASED D2D ENVIRONMENTS
V.A Background
V.B Proposed Scheme
V.B.1 Problem Statement
V.B.2 Dynamically Synchronized Power Management
V.B.3 Adaptive CTWindow Control (AC)
V.B.4 Adaptive Temporary CTWindow Control (AT)
V.C Performance Evaluation
V.C.1 Formulation of Duty Cycle and End-to-End delay
V.C.2 Performance Evaluation
V.C.3 Formulation and Evaluation of AC and AT control
V.D Chapter Summary
CHAPTER VI CONCLUSIONDoctoralThis thesis focuses on methods of enhancing Quality-of-Service (QoS) in WLAN based multi-hop networks for more efficient data dissemination. With great advancements in the technology of smartphones and mobile networking, the global society is beginning to embrace another boom of various wireless networking services and applications. Following this trend, WLAN based networking devices and products have become the most popular means of data communication for supporting these future services. However, contrary to existing QoS researches conducted in WLAN environments, these future applications have unique demands and requirements depending on the type of service they provide. Therefore, as being the primary means of communication in the present and future alike, WLAN based communication technology must account for these difference in services and provide efficient means of supporting QoS for them.
This thesis views various scenarios and use cases of WLAN based multi-hop networking environments and analyzes the problems that current WLAN systems may pose. To account for these problems, novel solutions are proposed and analyzed to show that the contributions in this thesis can greatly improve the efficiency of future WLAN based services. Especially, three technologies of supporting QoS are discussed: 1) Enhancing QoS for data dissemination in vehicular speed communications systems, 2) Streaming multimedia surveillance systems, and 3) Power efficient QoS for battery-limited systems. It is expected that each technology can improve the performance of QoS in WLAN based multi-hop networking applications depending on the various requirements that they demand
Selecive Catalytic Reduction of NOx in Lean Burn Engine Exhaust by Highly Active Pt Supported on V-impregnated MCM-41
No full textOn the Pt/V/MCM-41 catalyst with 1wt% Pt and 4wt% V, the maximum conversion of NO reduction into N2+N2O by C3H6 was about 73%, which was 10% higher than on 1wt% Pt/silica, and this maximum conversion was maintained over a temperature range of 70.DEG.C. between 270 and 340.DEG.C.. (author abst.
The Eric Woo Project
No full textThe Eric Woo Project is a short film that demonstrates how communication skills that show empathy and compassion lead to better health outcomes for a person considering self harm or suicide
[without title] / Agnus Dei - JWK Mus.Ms. 16 : V, org; f; StrK WoO 6.13
No full textNotiert auf der Rückseite des Benedictus StrK WoO 12. - Oben links Signaturschild "J N|o 97."Johann Wenzel Kalliwoda [ermittelt]Diplomatischer Titel: [heading:] Agnus DeiQuelle: Autograph manuscriptBesetzungshinweis: V, or
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
[without title] / Benedictus - JWK Mus.Ms. 16 : V, org; B|b; StrK WoO 6.12
No full textAuf der Rückseite der Partitur wurde das Agnus Dei StrK WoO 6.13 notiert. - Oben links Signaturschild "J N|o 97."Johann Wenzel Kalliwoda [ermittelt]Diplomatischer Titel: [heading:] BenedictusQuelle: Autograph manuscriptBesetzungshinweis: V, or
7-ketocholesterol jako modulátor adheze a zánětlivé odpovědi v jaterních sinusoidálních endotelových buňkách
No full textUniverzita Karlova, Farmaceutická fakulta v Hradci Králové Katedra biologických a lékařských věd Název diplomové práce: 7-ketocholesterol jako modulátor adheze a zánětlivé reakce v sinusoidálních endoteliálních buňkách jater Autor: SungWook Woo Vedoucídiplomové práce: PharmDr. Petra Fikrová, Ph.D Chronická onemocnění jater, jako je ztukovatění jater spojené s metabolickou dysfunkcí (MAFLD) a steatohepatitida spojená s metabolickou dysfunkcí (MASH), jsou úzce spojena se změnami v jaterních sinusoidálních endoteliálních buňkách (LSECs). Tyto buňky hrají klíčovou roli v regulaci vaskulární homeostázy, imunitní tolerance a v mezibuněčné komunikaci s ostatními typy jaterních buněk. Oxidované deriváty cholesterolu, zejména 7-ketocholesterol (7-KC), jsou považovány za významné faktory přispívající k endoteliální dysfunkci, avšak jejich působení na LSECs dosud nebylo dostatečně objasněno. Cí lem této práce bylo zkoumat vliv 7-KC na zánětlivou aktivaci a adhezivní vlastnosti LSECs in vitro. Primární lidské LSECs byly kultivovány a ošetřeny 25 µM 7-KC po různě dlouhou dobu. Exprese mezibuněčné adhezní molekuly-1 (ICAM-1), vaskulárníadhezní molekuly-1 (VCAM-1), endoteliálnísyntázy oxidu dusnatého (NOS3) a chemokinu C-C motiv ligand 2 (CCL2) byla analyzována na úrovni mRNA pomocíqPCR. Na proteinové úrovni byly...Katedra biologických a lékařských vědDepartment of Biological and Medical SciencesFaculty of Pharmacy in Hradec KrálovéFarmaceutická fakulta v Hradci Králov
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Aliens-Refugees-Resettlement in Third Country not Relevant to Determination of Eligibility for Refugee Status. Chien Woo v. Rosenberg (9th Cir. 1969)
No full textThis recent case discusses Chien Woo v. Rosenberg (9th Cir. 1969)
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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