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TakaTuka
TakaTuka is a Java virtual machine (JVM) mainly focused on wireless sensor network devices. The VM focussed on supporting small devices with at least 4 KiB of RAM and greater than 48 KiB of flash memory. TakaTuka currently offers CLDC compatible library support. TakaTuka was developed by University of Freiburg and first went public on SourceForge in 2009. It was created to reduce the learning time of developing wireless sensor network applications by introducing a common Java language among all supported mote. TakaTuka stores Java Class files into a highly compact format named Tuk. This format strips all unnecessary information, such as class names and retains only essential information for runtime. It also shares a similar Split VM architecture with Squawk virtual machine. Furthermore, TakaTuka also employs extensive bytecode compaction that results in smaller code size and faster bytecode execution. Supported motes * Crossbow IRIS * Crossbow MICA2/MICAz * Crossbow TelosB * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Java Virtual Machines
This article provides non-exhaustive lists of Java SE Java virtual machines (JVMs). It does not include every Java ME vendor. Note that Jakarta EE runs on the standard Java SE JVM but that some vendors specialize in providing a modified JVM optimized for enterprise applications. Much Java development work takes place on Windows, Solaris, Linux, and FreeBSD, primarily with the Oracle JVMs. Note the further complication of different 32-bit/64-bit varieties. The primary Java VM reference implementation is the OpenJDK HotSpot, produced by Oracle Corporation and many other big and medium-sized companies (e.g. IBM, Redhat, Microsoft, Azul, SAP). Free and open source implementations Active * Codename One – uses the open source ParparVM * GraalVM – is based on HotSpot/OpenJDK, it has a polyglot feature, to transparently mix and match supported languages. * HotSpot – the open-source Java VM implementation by Oracle. * IKVM – Java for Mono and the Microsoft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Random-access Memory
Random-access memory (RAM; ) is a form of Computer memory, electronic computer memory that can be read and changed in any order, typically used to store working Data (computing), data and machine code. A random-access memory device allows data items to be read (computer), read or written in almost the same amount of time irrespective of the physical location of data inside the memory, in contrast with other direct-access data storage media (such as hard disks and Magnetic tape data storage, magnetic tape), where the time required to read and write data items varies significantly depending on their physical locations on the recording medium, due to mechanical limitations such as media rotation speeds and arm movement. In today's technology, random-access memory takes the form of integrated circuit (IC) chips with MOSFET, MOS (metal–oxide–semiconductor) Memory cell (computing), memory cells. RAM is normally associated with Volatile memory, volatile types of memory where s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossbow Technology
Crossbow Technology, Inc. (also referred to as XBOW) was a California-based company that specialized in navigation products, including gyroscopes and guidance, navigation, and control units. History Crossbow was founded by Mike A. Horton in 1995. It created products based on technology developed at the University of California, Berkeley, supported by A. Richard Newton and had investment from Cisco, Intel, and the Paladin Capital Group in 2005. Crossbow was one of the first suppliers of the Berkeley-style MICA sensor nodes that it called "motes" which ran the TinyOS operating system. Crossbow received awards for these products, including a "Best of Sensors Expo Gold 2006" and the BP Helios Award. Formerly a joint venture, Crossbow Japan became the Sensor Networks and Systems department of Sumitomo Precision Products. On June 5, 2011, Crossbow was acquired by Moog Inc. for about $32 million. Products The AHRS500GA, introduced in 2003, was a completely solid-state FAA-c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bytecode
Bytecode (also called portable code or p-code) is a form of instruction set designed for efficient execution by a software interpreter. Unlike human-readable source code, bytecodes are compact numeric codes, constants, and references (normally numeric addresses) that encode the result of compiler parsing and performing semantic analysis of things like type, scope, and nesting depths of program objects. The name ''bytecode'' stems from instruction sets that have one- byte opcodes followed by optional parameters. Intermediate representations such as bytecode may be output by programming language implementations to ease interpretation, or it may be used to reduce hardware and operating system dependence by allowing the same code to run cross-platform, on different devices. Bytecode may often be either directly executed on a virtual machine (a p-code machine, i.e., interpreter), or it may be further compiled into machine code for better performance. Since bytecode instruct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squawk Virtual Machine
Squawk is a Java micro edition virtual machine for embedded system and small devices. Most virtual machines for the Java platform are written in low level native languages such as C/ C++ and assembler; what makes Squawk different is that Squawk's core is mostly written in Java (this is called a meta-circular interpreter). A Java implementation provides ease of portability, and integration of virtual machine and application resources such as objects, threads, and operating-system interfaces. The Squawk Virtual Machine figure can be simplified as: * Write as much of the VM in Java as possible * Targeting small, resource constrained devices * Enable Java for micro-embedded development The research project was inspired by Squeak. Squawk has a Java ME heritage and features a small memory footprint. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Class (file Format)
A Java class file is a file (with the filename extension) containing Java bytecode that can be executed on the Java Virtual Machine (JVM). A Java class file is usually produced by a Java compiler from Java programming language source files ( files) containing Java classes (alternatively, other JVM languages can also be used to create class files). If a source file has more than one class, each class is compiled into a separate class file. Thus, it is called a file because it contains the bytecode for a single class. JVMs are available for many platforms, and a class file compiled on one platform will execute on a JVM of another platform. This makes Java applications platform-independent. History On 11 December 2006, the class file format was modified under Java Specification Request (JSR) 202. File layout and structure Sections There are 10 basic sections to the Java class file structure: * Magic Number: 0xCAFEBABE * Version of Class File Format: the minor and maj ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SourceForge
SourceForge is a web service founded by Geoffrey B. Jeffery, Tim Perdue, and Drew Streib in November 1999. SourceForge provides a centralized software discovery platform, including an online platform for managing and hosting open-source software projects, and a directory for comparing and reviewing B2B software that lists over 104,500 business software titles. It provides source code repository hosting, bug tracking, mirroring of downloads for load balancing, a wiki for documentation, developer and user mailing lists, user-support forums, user-written reviews and ratings, a news bulletin, micro-blog for publishing project updates, and other features. SourceForge was one of the first to offer this service free of charge to open-source projects. Since 2012, the website has run on Apache Allura software. SourceForge offers free hosting and free access to tools for developers of free and open-source software. , the SourceForge repository claimed to host more than 502,00 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Connected Limited Device Configuration
The Connected Limited Device Configuration (CLDC) is a specification of a framework for Java ME applications describing the basic set of libraries and virtual-machine features that must be present in an implementation. The CLDC is combined with one or more profiles to give developers a platform for building applications on embedded devices with very limited resources such as pagers and mobile phones.CLDC Overview http://java.sun.com/javame/technology/cldc/overview.jsp The CLDC was developed under the Java Community Process as JSR 30JSR 30, CLDC 1.0 http://www.jcp.org/en/jsr/detail?id=30 (CLDC 1.0) and JSR 139JSR 139, CLDC 1.1 http://www.jcp.org/en/jsr/detail?id=139 (CLDC 1.1). Typical requirements CLDC is designed for devices that have limited processing power, memory, and graphical capability. Devices typically have the following features: * 16- bit or 32-bit CPU with a clock speed of 16 MHz or higher * At least 160 KB ROM allocated for the CLDC libraries and virtu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flash Memory
Flash memory is an Integrated circuit, electronic Non-volatile memory, non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR gate, NOR and NAND gate, NAND logic gates. Both use the same cell design, consisting of floating-gate MOSFETs. They differ at the circuit level, depending on whether the state of the bit line or word lines is pulled high or low; in NAND flash, the relationship between the bit line and the word lines resembles a NAND gate; in NOR flash, it resembles a NOR gate. Flash memory, a type of floating-gate memory, was invented by Fujio Masuoka at Toshiba in 1980 and is based on EEPROM technology. Toshiba began marketing flash memory in 1987. EPROMs had to be erased completely before they could be rewritten. NAND flash memory, however, may be erased, written, and read in blocks (or pages), which generally are much smaller than the entire devi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Freiburg
The University of Freiburg (colloquially ), officially the Albert Ludwig University of Freiburg (), is a public university, public research university located in Freiburg im Breisgau, Baden-Württemberg, Germany. The university was founded in 1457 by the House of Habsburg, Habsburg dynasty as the second university in Austrian-Habsburg territory after the University of Vienna. Today, Freiburg is the List of universities in Germany#Universities by date of establishment, fifth-oldest university in Germany, with a long tradition of teaching the humanities, social sciences and natural sciences and technology and enjoys a high academic reputation both nationally and internationally. The university is made up of 11 faculty (division), faculties and attracts students from across Germany as well as from over 120 other countries. Foreign students constitute about 18.2% of total student numbers. The University of Freiburg has been associated with figures such as Hannah Arendt, Rudolf Carna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lahore University Of Management Sciences
Lahore University of Management Sciences, also known by its acronym LUMS, is a Private university, private research university in Lahore, Punjab, Pakistan, Punjab, Pakistan. Founded in 1985, it is ranked as one of the most prestigious modern List of universities in Pakistan, universities in Pakistan. In 1984, Syed Babar Ali recognized the shortage of qualified managers in the country. He proposed to establish a world-class university that would attract and retain the highest caliber of students and faculty. He shared this idea with fellow businessman and close friend, Abdul Razak Dawood, who was in full support of the vision. The university has since then expanded, launching a Liberal arts education, liberal arts undergraduate school in 1994, an engineering school in 2008, a Shaikh Ahmad Hassan School of Law, law school in 2004 and an education school in 2017. The university launched a National Outreach Programme (NOP) in 2001 to provide financial aid to students and in 2015, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Java Virtual Machine
A Java virtual machine (JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation. Having a specification ensures interoperability of Java programs across different implementations so that program authors using the Java Development Kit (JDK) need not worry about idiosyncrasies of the underlying hardware platform. The JVM reference implementation is developed by the OpenJDK project as open source code and includes a JIT compiler called HotSpot. The commercially supported Java releases available from Oracle are based on the OpenJDK runtime. Eclipse OpenJ9 is another open source JVM for OpenJDK. JVM specification The Java virtual machine is an abstract (virtual) computer defined by a specification. It is a part of the Java runtime environment. The garbage collection ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
