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A Microkernel API for Fine-Grained Decomposition
A Microkernel API for Fine-Grained Decomposition Sebastian Reichelt Jan Stoess Frank Bellosa System Architecture Group, University of Karlsruhe, Germany freichelt,stoess,[email protected] ABSTRACT from the microkernel APIs in existence. The need, for in- Microkernel-based operating systems typically require spe- stance, to explicitly pass messages between servers, or the cial attention to issues that otherwise arise only in dis- need to set up threads and address spaces in every server for tributed systems. The resulting extra code degrades per- parallelism or protection require OS developers to adopt the formance and increases development effort, severely limiting mindset of a distributed-system programmer rather than to decomposition granularity. take advantage of their knowledge on traditional OS design. We present a new microkernel design that enables OS devel- Distributed-system paradigms, though well-understood and opers to decompose systems into very fine-grained servers. suited for physically (and, thus, coarsely) partitioned sys- We avoid the typical obstacles by defining servers as light- tems, present obstacles to the fine-grained decomposition weight, passive objects. We replace complex IPC mecha- required to exploit the benefits of microkernels: First, a nisms by a simple function-call approach, and our passive, lot of development effort must be spent into matching the module-like server model obviates the need to create threads OS structure to the architecture of the selected microkernel, in every server. Server code is compiled into small self- which also hinders porting existing code from monolithic sys- contained files, which can be loaded into the same address tems. Second, the more servers exist | a desired property space (for speed) or different address spaces (for safety). -
Openvms Record Management Services Reference Manual
OpenVMS Record Management Services Reference Manual Order Number: AA-PV6RD-TK April 2001 This reference manual contains general information intended for use in any OpenVMS programming language, as well as specific information on writing programs that use OpenVMS Record Management Services (OpenVMS RMS). Revision/Update Information: This manual supersedes the OpenVMS Record Management Services Reference Manual, OpenVMS Alpha Version 7.2 and OpenVMS VAX Version 7.2 Software Version: OpenVMS Alpha Version 7.3 OpenVMS VAX Version 7.3 Compaq Computer Corporation Houston, Texas © 2001 Compaq Computer Corporation Compaq, AlphaServer, VAX, VMS, the Compaq logo Registered in U.S. Patent and Trademark Office. Alpha, PATHWORKS, DECnet, DEC, and OpenVMS are trademarks of Compaq Information Technologies Group, L.P. in the United States and other countries. UNIX and X/Open are trademarks of The Open Group in the United States and other countries. All other product names mentioned herein may be the trademarks of their respective companies. Confidential computer software. Valid license from Compaq required for possession, use, or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor’s standard commercial license. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is provided "as is" without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty. -
Mobile Application Development Mapbox - a Commercial Mapping Service Using Openstreetmap
Mobile Application Development Mapbox - a commercial mapping service using OpenStreetMap Waterford Institute of Technology October 19, 2016 John Fitzgerald Waterford Institute of Technology, Mobile Application Development Mapbox - a commercial mapping service using OpenStreetMap 1/16 OpenStreetMap An open source project • OpenStreetMap Foundation • A non-profit organisation • Founded in 2004 by Steve Coast • Over 2 million registered contributors • Primary output OpenStreetMap data Waterford Institute of Technology, Mobile Application Development Mapbox - a commercial mapping service using OpenStreetMap 2/16 OpenStreetMap An open source project • Various data collection methods: • On-site data collection using: • paper & pencil • computer • preprinted map • cameras • Aerial photography Waterford Institute of Technology, Mobile Application Development Mapbox - a commercial mapping service using OpenStreetMap 3/16 MapBox Competitor to Google Maps • Provides commercial mapping services. • OpenStreetMap a data source for many of these. • Large provider of custom online maps for websites. • Clients include Foursquare, Financial Times, Uber. • But also NASA and some proprietary sources. • Startup 2010 • Series B round funding 2015 $52 million • Contrast Google 2015 profit $16 billion Waterford Institute of Technology, Mobile Application Development Mapbox - a commercial mapping service using OpenStreetMap 4/16 MapBox Software Development Kits (SDKs) • Web apps • Android • iOS • JavaScript (browser & node) • Python Waterford Institute of Technology, -
A Comparison of Feature Density for Large Scale Online Maps
DOI: 10.14714/CP97.1707 PEER-REVIEWED ARTICLE A Comparison of Feature Density for Large Scale Online Maps Michael P. Peterson (he/him) University of Nebraska at Omaha [email protected] Large-scale maps, such as those provided by Google, Bing, and Mapbox, among others, provide users an important source of information for local environments. Comparing maps from these services helps to evaluate both the quality of the underlying spatial data and the process of rendering the data into a map. The feature and label density of three different mapping services was evaluated by making pairwise comparisons of large-scale maps for a series of random areas across three continents. For North America, it was found that maps from Google had consistently higher feature and label den- sity than those from Bing and Mapbox. Google Maps also held an advantage in Europe, while maps from Bing were the most detailed in sub-Saharan Africa. Maps from Mapbox, which relies exclusively on data from OpenStreetMap, had the lowest feature and label density for all three areas. KEYWORDS: Web Mapping Services; Multi-Scale Pannable (MSP) maps; OpenStreetMap; Application Programming Interface (API) INTRODUCTION One of the primary benefits of using online map Since the introduction of the technique in 2005 by services like those available from Google, Bing, and Google, all major online map providers have adopted the OpenStreetMap, is that zooming-in allows access to same underlying technology. Vector data is projected and large-scale maps. Maps at these large scales are not avail- divided into vector tiles at multiple scales. The tile bound- able to most (if any) individuals from any other source. -
Introduction to Unix
Introduction to Unix Rob Funk <[email protected]> University Technology Services Workstation Support http://wks.uts.ohio-state.edu/ University Technology Services Course Objectives • basic background in Unix structure • knowledge of getting started • directory navigation and control • file maintenance and display commands • shells • Unix features • text processing University Technology Services Course Objectives Useful commands • working with files • system resources • printing • vi editor University Technology Services In the Introduction to UNIX document 3 • shell programming • Unix command summary tables • short Unix bibliography (also see web site) We will not, however, be covering these topics in the lecture. Numbers on slides indicate page number in book. University Technology Services History of Unix 7–8 1960s multics project (MIT, GE, AT&T) 1970s AT&T Bell Labs 1970s/80s UC Berkeley 1980s DOS imitated many Unix ideas Commercial Unix fragmentation GNU Project 1990s Linux now Unix is widespread and available from many sources, both free and commercial University Technology Services Unix Systems 7–8 SunOS/Solaris Sun Microsystems Digital Unix (Tru64) Digital/Compaq HP-UX Hewlett Packard Irix SGI UNICOS Cray NetBSD, FreeBSD UC Berkeley / the Net Linux Linus Torvalds / the Net University Technology Services Unix Philosophy • Multiuser / Multitasking • Toolbox approach • Flexibility / Freedom • Conciseness • Everything is a file • File system has places, processes have life • Designed by programmers for programmers University Technology Services -
A Review of Openstreetmap Data Peter Mooney* and Marco Minghini† *Department of Computer Science, Maynooth University, Maynooth, Co
CHAPTER 3 A Review of OpenStreetMap Data Peter Mooney* and Marco Minghini† *Department of Computer Science, Maynooth University, Maynooth, Co. Kildare, Ireland, [email protected] †Department of Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy Abstract While there is now a considerable variety of sources of Volunteered Geo- graphic Information (VGI) available, discussion of this domain is often exem- plified by and focused around OpenStreetMap (OSM). In a little over a decade OSM has become the leading example of VGI on the Internet. OSM is not just a crowdsourced spatial database of VGI; rather, it has grown to become a vast ecosystem of data, software systems and applications, tools, and Web-based information stores such as wikis. An increasing number of developers, indus- try actors, researchers and other end users are making use of OSM in their applications. OSM has been shown to compare favourably with other sources of spatial data in terms of data quality. In addition to this, a very large OSM community updates data within OSM on a regular basis. This chapter provides an introduction to and review of OSM and the ecosystem which has grown to support the mission of creating a free, editable map of the whole world. The chapter is especially meant for readers who have no or little knowledge about the range, maturity and complexity of the tools, services, applications and organisations working with OSM data. We provide examples of tools and services to access, edit, visualise and make quality assessments of OSM data. We also provide a number of examples of applications, such as some of those How to cite this book chapter: Mooney, P and Minghini, M. -
Navegação Turn-By-Turn Em Android Relatório De Estágio Para A
INSTITUTO POLITÉCNICO DE COIMBRA INSTITUTO SUPERIOR DE ENGENHARIA DE COIMBRA Navegação Turn-by-Turn em Android Relatório de estágio para a obtenção do grau de Mestre em Informática e Sistemas Autor Luís Miguel dos Santos Henriques Orientação Professor Doutor João Durães Professor Doutor Bruno Cabral Mestrado em Engenharia Informática e Sistemas Navegação Turn-by-Turn em Android Relatório de estágio apresentado para a obtenção do grau de Mestre em Informática e Sistemas Especialização em Desenvolvimento de Software Autor Luís Miguel dos Santos Henriques Orientador Professor Doutor João António Pereira Almeida Durães Professor do Departamento de Engenharia Informática e de Sistemas Instituto Superior de Engenharia de Coimbra Supervisor Professor Doutor Bruno Miguel Brás Cabral Sentilant Coimbra, Fevereiro, 2019 Agradecimentos Aos meus pais por todo o apoio que me deram, Ao meu irmão pela inspiração, À minha namorada por todo o amor e paciência, Ao meu primo, por me fazer acreditar que nunca é tarde, Aos meus professores por me darem esta segunda oportunidade, A todos vocês devo o novo rumo da minha vida. Obrigado. i ii Abstract This report describes the work done during the internship of the Master's degree in Computer Science and Systems, Specialization in Software Development, from the Polytechnic of Coimbra - ISEC. This internship, which began in October 17 of 2017 and ended in July 18 of 2018, took place in the company Sentilant, and had as its main goal the development of a turn-by- turn navigation module for a logistics management application named Drivian Tasks. During the internship activities, a turn-by-turn navigation module was developed from scratch, while matching the specifications indicated by the project managers in the host entity. -
Software Development Methodologies on Android Application Using Example
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by VUS Repository POLYTECHNIC OF ŠIBENIK DEPARTMENT OF MANAGEMENT SPECIALIST STUDY OF MANAGEMENT Ivan Bumbak SOFTWARE DEVELOPMENT METHODOLOGIES ON ANDROID APPLICATION USING EXAMPLE Graduate thesis Šibenik, 2018. POLYTECHNIC OF ŠIBENIK DEPARTMENT OF MANAGEMENT SPECIALIST STUDY OF MANAGEMENT SOFTWARE DEVELOPMENT METHODOLOGIES ON ANDROID APPLICATION USING EXAMPLE Graduate thesis Course: Software engineering Mentor: PhD Frane Urem, college professor Student: Ivan Bumbak Student ID number: 0023096262 Šibenik, September 2018. TEMELJNA DOKUMENTACIJSKA KARTICA Veleučilište u Šibeniku Diplomski rad Odjel Menadžmenta Diplomski specijalistički stručni studij Menadžment Razvojne metode programa na Android platformi koristeći primjer Ivan Bumbak [email protected] Postoji mnogo razvojnih metoda programskih rješenja koje se mogu koristiti za razvoj istih na bilo kojoj platformi. Koja metoda će se koristiti ovisi o zahtjevnosti samog projekta, koliko ljudi radi na projektu, te u kojem vremenskom roku projekt mora biti isporučen. U svrhu ovog diplomskog rada razvijena je Android aplikacija putem tradicionalne metode, iako su danas sve više i više popularne takozvane agile metode. Agile, ili agilan, znači biti brz i sposoban reagirati na vrijeme te prilagoditi se svim promjenama u bilo kojem trenutku razvoja projekta. U radu su objašnjenje najpopularnije agile metode te su prikazane prednosti korištenja agile metoda u odnosu na tradicionalnu metodu. (37 stranica -
HP Openvms Utility Routines Manual
HP OpenVMS Utility Routines Manual Order Number: BA554-90019 June 2010 This manual describes the OpenVMS utility routines, a set of routines that provide a programming interface to various OpenVMS utilities. Revision/Update Information: This manual supersedes the HP OpenVMS Utility Routines Manual, OpenVMS Alpha Version 8.3. Software Version: OpenVMS Version 8.4 for Integrity servers OpenVMS Alpha Version 8.4 Hewlett-Packard Company Palo Alto, California © Copyright 2010 Hewlett-Packard Development Company, L.P. Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor’s standard commercial license. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. Intel and Itanium are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. ZK4493 The HP OpenVMS documentation set is available on CD. This document was prepared using DECdocument, Version 3.3-1B. Contents Preface ............................................................ xvii 1 Introduction to Utility Routines 2 Access Control List (ACL) Editor Routine 2.1 Introduction to the ACL Editor Routine ........................... ACL–1 2.2 Using the ACL Editor Routine: An Example ....................... ACL–1 2.3 ACL Editor Routine . ........................................ ACL–2 ACLEDIT$EDIT ........................................... -
Google Earth Engine Sentinel-3 OLCI Level-1 Dataset Deviates from the Original Data: Causes and Consequences
remote sensing Technical Note Google Earth Engine Sentinel-3 OLCI Level-1 Dataset Deviates from the Original Data: Causes and Consequences Egor Prikaziuk * , Peiqi Yang and Christiaan van der Tol Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, 7500 AE Enschede, The Netherlands; [email protected] (P.Y.); [email protected] (C.v.d.T.) * Correspondence: [email protected] or [email protected]; Tel.: +31-534-897-112 Abstract: In this study, we demonstrate that the Google Earth Engine (GEE) dataset of Sentinel-3 Ocean and Land Color Instrument (OLCI) level-1 deviates from the original Copernicus Open Access Data Hub Service (DHUS) data by 10–20 W m−2 sr−1 µm−1 per pixel per band. We compared GEE and DHUS single pixel time series for the period from April 2016 to September 2020 and identified two sources of this discrepancy: the ground pixel position and reprojection. The ground pixel position of OLCI product can be determined in two ways: from geo-coordinates (DHUS) or from tie-point coordinates (GEE). We recommend using geo-coordinates for pixel extraction from the original data. When the Sentinel Application Platform (SNAP) Pixel Extraction Tool is used, an additional distance check has to be conducted to exclude pixels that lay further than 212 m from the point of interest. Even geo-coordinates-based pixel extraction requires the homogeneity of the target area at a 700 m diameter (49 ha) footprint (double of the pixel resolution). The GEE OLCI dataset can be safely used if the homogeneity assumption holds at 2700 m diameter (9-by-9 OLCI pixels) or if the uncertainty in the radiance of 10% is not critical for the application. -
Location Platform Index: Mapping and Navigation
Location Platform Index: Mapping and Navigation Key vendor rankings and market trends: June 2019 update Publication Date: 05 Aug 2019 | Product code: CES006-000085 Eden Zoller Location Platform Index: Mapping and Navigation Summary In brief Ovum's Location Platform Index provides an ongoing assessment and subsequent ranking of the major vendors in the location platform market, with particular reference to the mapping and navigation space. The index evaluates each vendor based on two main criteria: the completeness of its platform and the platform's market reach. It considers the core capabilities of the location platform along with the information that the platform opens up to developers and the wider location community. The index provides an overview of the market and assesses the strengths and weaknesses of the leading players. It also highlights the key trends in the mapping space that vendors must keep up with if they want to stay ahead of the game. Ovum view . There are fresh opportunities for location data and services in the consumer domain. The deepening artificial intelligence (AI) capabilities of smartphones are enabling more immersive applications and experiences that can be further enhanced by location capabilities, such as the use of location to enrich augmented reality (AR) shopping applications or enhance contextual gaming. At the same time, AI assistants will draw more deeply on location data, not just on smartphones but also via AI assistants integrated with other connected platforms, including vehicles. Ovum predicts that the global installed base of AI assistants across all device types will grow from 2.39 billion in 2018 to 8.73 billion by the end of 2024. -
The 6 Key Benefits of Being an Api-Centric Organization
THE 6 KEY BENEFITS OF BEING AN API-CENTRIC ORGANIZATION © 2019 Radical I/O Technology Inc. FOREWORD Digital transformation is about more than adopting the latest technologies. It is about maximizing value by using technology to improve efficiency and productivity, drive engagement and growth, and ultimately make the lives of customers, partners and staff better. APIs play an integral role as the connectors between the systems, data, and people that enable digital transformation initiatives. This guide, the first in our series exploring API best practices, therefore focuses on what APIs are, how they work, and outlines six benefits they offer for achieving organizational goals. Radical I/O is a people-first technology consultancy and lab in Vancouver, BC that specializes in data-driven enterprise software development with highly performant API architecture at its core. We understand that the needs of private and public organizations are continually evolving, and we enjoy working collaboratively with our clients and partners to create forward-thinking technology solutions. IAN SIM Chief Technology Officer Radical I/O Technology [email protected] © 2019 Radical I/O Technology Inc. THE 6 KEY BENEFITS OF BEING AN API-CENTRIC ORGANIZATION 3 CONTENTS There’s an API for that ..........................................................................1 What is an API? ..................................................................................... 2 Types of APIs ...........................................................................................4