Secure mobile radio communication over narrowband RF channel.

by Wong Chun Kau, Jolly.Thesis (M.Phil.)--Chinese University of Hong Kong, 1992.Includes bibliographical references (leaves 84-88).ABSTRACT --- p.1ACKNOWLEDGEMENT --- p.3Chapter 1. --- INTRODUCTION --- p.7Chapter 1.1 --- Land Mobile Radio (LMR) CommunicationsChapter 1.2 --- Paramilitary Communications SecurityChapter 1.3 --- Voice Scrambling MethodsChapter 1.4 --- Digital Voice EncryptionChapter 1.5 --- Digital Secure LMRChapter 2. --- DESIGN GOALS --- p.20Chapter 2.1 --- System Concept and ConfigurationChapter 2.2 --- Operational RequirementsChapter 2.2.1 --- Operating conditionsChapter 2.2.2 --- Intelligibility and speech qualityChapter 2.2.3 --- Field coverage and transmission delayChapter 2.2.4 --- Reliability and maintenanceChapter 2.3 --- Functional RequirementsChapter 2.3.1 --- Major system featuresChapter 2.3.2 --- Cryptographic featuresChapter 2.3.3 --- Phone patch facilityChapter 2.3.4 --- Mobile data capabilityChapter 2.4 --- Bandwidth RequirementsChapter 2.5 --- Bit Error Rate RequirementsChapter 3. --- VOICE CODERS --- p.38Chapter 3.1 --- Digital Speech Coding MethodsChapter 3.1.1 --- Waveform codingChapter 3.1.2 --- Linear predictive codingChapter 3.1.3 --- Sub-band codingChapter 3.1.4 --- VocodersChapter 3.2 --- Performance EvaluationChapter 4. --- CRYPTOGRAPHIC CONCERNS --- p.52Chapter 4.1 --- Basic Concepts and CryptoanalysisChapter 4.2 --- Digital Encryption TechniquesChapter 4.3 --- Crypto SynchronizationChapter 4.3.1 --- Auto synchronizationChapter 4.3.2 --- Initial synchronizationChapter 4.3.3 --- Continuous synchronizationChapter 4.3.4 --- Hybrid synchronizationChapter 5. --- DIGITAL MODULATION --- p.63Chapter 5.1 --- Narrowband Channel RequirementsChapter 5.2 --- Narrowband Digital FMChapter 5.3 --- Performance EvaluationChapter 6. --- SYSTEM IMPLEMENTATION --- p.71Chapter 6.1 --- Potential EMC ProblemsChapter 6.2 --- Frequency PlanningChapter 6.3 --- Key ManagementChapter 6.4 --- Potential Electromagnetic Compatibility (EMC) ProblemsChapter 7. --- CONCLUSION --- p.80LIST OF ILLUSTRATIONS --- p.81REFERENCES --- p.82APPENDICES --- p.89Chapter I. --- Path Propagation Loss(L) Vs Distance (d)Chapter II. --- Speech Quality Assessment Tests performedby Special Duties Unit (SDU

Proceedings of the Second International Mobile Satellite Conference (IMSC 1990)

Presented here are the proceedings of the Second International Mobile Satellite Conference (IMSC), held June 17-20, 1990 in Ottawa, Canada. Topics covered include future mobile satellite communications concepts, aeronautical applications, modulation and coding, propagation and experimental systems, mobile terminal equipment, network architecture and control, regulatory and policy considerations, vehicle antennas, and speech compression

Caractérisation des interactions glycosaminoglycannes/protéines dans le but de développer des molécules d'intérêt thérapeutique : <br />exemples de l'Endocan et de l'interféron gamma

Proteoglycans are complex macromolecules which consist structurally of a core protein and one or more covalently linked glycosaminoglycan chains. Both components can interact with a variety of binding proteins known to be involved in various pathophysiological processes such as inflammation and cancer. The characterization of the specific interactions between glycosaminoglycans and their binding partners should raise new therapeutic opportunities in drug development.In this context, we first studied a recently discovered proteoglycan called endocan. By developing new processes for high yield production and purification, we have been able to further characterise the structure of endocan using different biochemical approaches and also to study the interactions with various binding partners including interferon Γ and hepatocyte growth factor. In the same time, the characterisation of the specific interaction of interferon gamma and the particular glycosaminoglycan of heparan sulphate type allowed the synthesis by sugar chemistry of glycosaminoglycan mimetics. Among these molecules, a glycoconjugate modulates the activity of the cytokine and could lead to the development of a new type of drugs.Les protéoglycannes exercent de nombreuses fonctions par le biais de leur partie protéique ou de leurs glycosaminoglycannes. La caractérisation des interactions entre les glycosaminoglycannes et des protéines a ouvert de larges champs d'applications. Dans ce cadre, deux thèmes de recherche ont été développés. Premièrement, nous nous sommes intéressés à un nouveau protéoglycanne appelé endocan. La développement des capacités de production et de purification de cette macromolécule, nous a permis par différentes approches de déterminer le profil structural de sa chaîne glycannique et de sa partie protéique, mais aussi d'étudier les interactions avec plusieurs de ses partenaires protéiques dont l'interféron Γ et l'hépatocyte growth factor, impliqués respectivement dans l'inflammation et le développement tumoral. Parallèlement, une étude structurale et fonctionnelle de l'interaction entre l'interféron gamma et des glycosaminoglycannes de type héparanes sulfates a conduit au développement de mimes oligosaccharidiques obtenus par synthèse chimique. Parmi ces molécules, certaines permettent de moduler in vitro l'activité de la cytokine, et constituent une base possible pour le développement de nouveaux médicaments

Prediction of Time-Dependent Deflection of High Strength Concrete Panels

This work presents a model for predicting analytically the time dependent deflection of high strength concrete HSC slabs. This model considers the factors that are significantly influence the long-term deflection of concrete slabs. Realising the effect of time on slab flexural rigidity, the proposed method follow the method of conducting short-term deflection of slabs.The analytical deflection based on the proposed method are compared with the experimental work conducted by the authors in 2005 (1) and also with several field measured deflections

RESIDENTIAL BUILDING DEVELOPMENT PROCESS IN KURDISTAN REGION GOVERNMENT

Nowadays, Residential buildings have become the most important part of real-estate markets in (KRG). The layout of housing in Kurdistan has transformed the face of major cities across the Region. Rapid changes since 2003, have witnessed copious architectural structures and large housing projects that have reshaped the landscape of its cities. The aim of this study is to study the housing developing policy in KRG. The objectives of the study are to evaluate the KRG's housing development policy and to investigate the types of house and the price range preferred by the potential buyer. The study focus on private residential building development projects and it is carried out by questionnaires and interviews. The respondents are the house buyers and the developers. A total of 100 questionnaires were distributed to the respondents and 78 questionnaires were returned duly answered. The data collected is analyzed using the SPSS (Statistical Package for the Social Sciences) and Average Index. The results of research indicated that the KRG’s housing development policy covers the ownership of the project land, full repatriation of project investment and profits allowed, import of spare parts tax exempt up to 15% of project cost and the employment of foreign workers allowed. Moreover, the types of house preferred by the house buyers are of double storey type and to be of corner lot. The price range preferred by the potential buyers are between (40,000 to 100,000) USD

Prediction Of Pressure Coefficients For Flat Lip Vertical Gates

The main function of dam structures is to regulate the discharges and heads of water required to satisfy the demand of power generation and water quantity supplied to river or stream behind the structure, hence the sluice gate will play the big role to achieve this process and then its design needs much more attention. The sluice gate within the tunnel of the dam is exposed to many types of static and hydrodynamic forces .Among these forces is the hydraulic downpull force which created from difference between downward force produced by flow passing over the top surface of gate and uplift force exerted by the jet flow on bottom gate surface . The evaluation of positive and / or negative downpull force values is important due to its effects on closure of the gate. The estimation of such force needs determination of many related parameters such as pressure distribution along and cross the bottom gate surface, top pressure ,jet velocity issuing below the gate ,operation head and the head downstream the gate shaft. In present research, the hydraulic model is used to carry out the required measurements and different types of gate lip shapes have been examined with various flow conditions and gate openings to evaluate the downpull force coefficient. The analysis of results assured that the geometry of the lip gate has significant effects on the hydrodynamics forces and consequently on its operation which in the case of its negative value will prevent the gate to close and make some failures and damages

Erbil Citadel Landscape Assessment In Order To Regional Best Practices

Many heritage areas around the world are suffered from neglect in maintenance or rehabilitation, and never consider their historical values as an attraction places for visitors, in addition to these problems a lot of ancient buildings were removed in different old cities and a new modern constructions were shown instead of traditional ones, and that leads to visual and structural distortion and thus a problem in tourism. The area surrounding the citadel of Erbil suffered from many of these troubles, thus we have to focus on them, and present suggestions to solve the problems by presenting a world successful experience in this fiel

Sustainability In Construction Projects: Part 2 (Case Studies)

The guideline developed in a companion study by the authors is applied and studied in this work to assess the sustainability score of several big construction projects in Kurdistan Region of Iraq. Results were varied as the sustainability measures being applied on certain steps and neglected on many others .Attention on this issue can be found in the conclusions