Parallel Doherty RF Power Amplifier For WiMAX Applications

abstract: This work covers the design and implementation of a Parallel Doherty RF Power Amplifier in a GaN HEMT process for medium power macro-cell (16W) base station applications. This work improves the key parameters of a Doherty Power Amplifier including the peak and back-off efficiency, operational instantaneous bandwidth and output power by proposing a Parallel Doherty amplifier architecture. As there is a progression in the wireless communication systems from the first generation to the future 5G systems, there is ever increasing demand for higher data rates which means signals with higher peak-to-average power ratios (PAPR). The present modulation schemes require PAPRs close to 8-10dB. So, there is an urgent need to develop energy efficient power amplifiers that can transmit these high data rate signals. The Doherty Power Amplifier (DPA) is the most common PA architecture in the cellular infrastructure, as it achieves reasonably high back-off power levels with good efficiency. This work advances the DPA architecture by proposing a Parallel Doherty Power Amplifier to broaden the PAs instantaneous bandwidth, designed with frequency range of operation for 2.45 – 2.70 GHz to support WiMAX applications and future broadband signals.Dissertation/ThesisMasters Thesis Electrical Engineering 201

U.S. Coast Guard alternatives for distributed data base management systems

The United States Coast Guard is a relatively small federal agency tasked with a number of duties. Its multi-mission nature and low budget is driving the Coast Guard to realize better use of its resources. A pivotal factor in this goal is the investment in the information systems architecture of the future, today. Within the information architecture, data base technology plays an important role. It is to be employed in major operational and administrative systems, as well as in the future Coast Guard District Minicomputer Procurement. The purpose of this thesis is to examine the alternatives available to the U.S. Coast Guard for implementing data base technology.http://archive.org/details/uscoastguardalte00fiegLieutenant, United States Coast GuardApproved for public release; distribution is unlimited

Desain Dan Implementasi Layanan Penyedia Data Penerimaan Mahasiswa Baru Berbasis Web Services Untuk Menunjang Executive Support System

A design and implement a data provider services (services provider) new admissions web-based services to support the needs of data for executive support system without reducing the workload of academic database server, ensure interoperability and security systems in Lampung State Polytechnic. With the data provider services (services provider) is a web-based services, the future of academic data base server can be accessed and processed using a multi-platform applications.Methods floating system used in this study are the method of software engineering approach, Linear Models. Starting with the analysis, to collect and analyze data through field studies. Later stages of the design, architectural design services for data providers, data design, interfaces and applications required. The next stage is the implementation of the service architecture design data providers (services provider) web-based services, data, interfaces and applications implemented on the real or actual conditions. The final step is testing the method of black box testing, test architecture for service providers warrant the entire system runs well and fi

Resources-Events-Agents Design Theory: A Revolutionary Approach to Enterprise System Design

Enterprise systems typically include constructs such as ledgers and journals with debit and credit entries as central pillars of the systems’ architecture due in part to accountants and auditors who demand those constructs. At best, structuring systems with such constructs as base objects results in the storing the same data at multiple levels of aggregation, which creates inefficiencies in the database. At worst, basing systems on such constructs destroys details that are unnecessary for accounting but that may facilitate decision making by other enterprise functional areas. McCarthy (1982) proposed the resources-events-agents (REA) framework as an alternative structure for a shared data environment more than thirty years ago, and scholars have further developed it such that it is now a robust design theory. Despite this legacy, the broad IS community has not widely researched REA. In this paper, we discuss REA’s genesis and primary constructs, provide a history of REA research, discuss REA’s impact on practice, and speculate as to what the future may hold for REA-based enterprise systems. We invite IS researchers to consider integrating REA constructs with other theories and various emerging technologies to help advance the future of information systems and business research

DECISION MODEL IMPLEMENTATION IN THE GLOBAL INFORMATION NETWORK ARCHITECTURE

The future battlefield is one that will be heavily influenced by rapidly changing technological capabilities of near-peer adversaries. Success in this environment will require simple to use systems that are adaptable to situations and capable of integration with other forces and systems. The Multi-Domain Operations Command, Control, Computers, Communications, Combat Systems, and Intelligence (MDOC5i) aims to prepare the Marine Corps for the future battlefield. Due to certain drawback of traditional machine learning techniques, MDOC5i uses vector relational data modeling (VRDM) to provide the Marine Corps with systems suitable for dynamic employment. MDOC5i uses the Global Information Network Architecture (GINA) as its VRDM platform. This research uses GINA to create a ubiquitous decision model that can be configured to USMC scenarios. The research implements the ubiquitous model and proves functionality through a network analysis use case. This decision model will serve as the base model for all GINA implementations. The ability to quickly construct and adapt GINA models based on scenarios and integrate those models into a common framework will provide the Marine Corps with information overmatch against future adversaries.Captain, United States Marine CorpsApproved for public release. Distribution is unlimited

Extracting Maximum Benefits from Web-Based Searching

With huge amounts of information connected to the Internet, efficient and effective discovery of resource and knowledge using the Internet has become an imminent research issue. A vast array of networks services is growing up around the Internet and massive amounts of information is added everyday. Users can now access massive amounts of information in various forms, thereby creating an equally massive problem. This rapid growth in data volume, user base, and data diversity render Internet-accessible information increasingly difficult to be used effectively. Therefore, search for a specific information on this massive and exploding Internet information resource base becomes highly critical. In this paper we discuss the issues involved in the application of machine learning techniques to the problem of Internet-based information overload. We present a general architecture and describe how it has been instantiated in a functional system we developed. The system attempts to concurrently maximize and optimize the resource/knowledge discovery, and custimize the information to individual users. We discuss the design issues involved in the attempt to develop an evolvable architecture which can easily and inexpensively accommodate future generations of web-based systems and technologies

TSAT4: A Modular 3U CubeSat Characterizing Anabaena Cylindrica in Low Earth Orbit

TSAT4 is the fourth iteration of the University of Manitoba Space Applications and Technology Society’s 3U nanosatellite design with a decentralized modular systems architecture that supports a biological payload. The payload tests the effects of exposure to a low earth orbit (LEO) environment on the growth cycle of Anabaena cylindrica bacteria. In addition to providing a potential base tropic layer for more advanced biological experiments, Anabaena cylindrica has shown potential for use in bioreactors for spacecraft life support and food production. As such, detailed characterization of how their lifecycle is affected by the LEO environment will be an important factor for future missions. This paper provides details about this scientific payload as well as the overall systems design, including: attitude determination and control, command and data handling, communications, power, structure, and thermal subsystems

Anomaly Detection for Next-Generation Space Launch Ground Operations

NASA is developing new capabilities that will enable future human exploration missions while reducing mission risk and cost. The Fault Detection, Isolation, and Recovery (FDIR) project aims to demonstrate the utility of integrated vehicle health management (IVHM) tools in the domain of ground support equipment (GSE) to be used for the next generation launch vehicles. In addition to demonstrating the utility of IVHM tools for GSE, FDIR aims to mature promising tools for use on future missions and document the level of effort - and hence cost - required to implement an application with each selected tool. One of the FDIR capabilities is anomaly detection, i.e., detecting off-nominal behavior. The tool we selected for this task uses a data-driven approach. Unlike rule-based and model-based systems that require manual extraction of system knowledge, data-driven systems take a radically different approach to reasoning. At the basic level, they start with data that represent nominal functioning of the system and automatically learn expected system behavior. The behavior is encoded in a knowledge base that represents "in-family" system operations. During real-time system monitoring or during post-flight analysis, incoming data is compared to that nominal system operating behavior knowledge base; a distance representing deviation from nominal is computed, providing a measure of how far "out of family" current behavior is. We describe the selected tool for FDIR anomaly detection - Inductive Monitoring System (IMS), how it fits into the FDIR architecture, the operations concept for the GSE anomaly monitoring, and some preliminary results of applying IMS to a Space Shuttle GSE anomaly