By Miguel A. Labrador
Drawing at the authors’ greater than six years of R&D in location-based info platforms (LBIS) in addition to their participation in defining the Java ME position API 2.0, Location-Based info platforms: constructing Real-Time monitoring purposes presents details and examples for growing real-time LBIS in accordance with GPS-enabled mobile telephones. every one bankruptcy offers a normal real-time monitoring process instance that may be simply tailored to focus on any program area and which can contain different sensor facts to make the method "participatory sensing" or "human-centric sensing." The ebook covers all the parts had to improve an LBIS. It discusses mobile phone programming utilizing the Java ME platform, positioning applied sciences, databases and spatial databases, communications, buyer- and server-side info processing, and real-time facts visualization through Google Maps and Google Earth. utilizing freely to be had software program, the authors comprise many code examples and certain directions for development your individual procedure and establishing your whole improvement atmosphere. net ResourceA better half site at www.csee.usf.edu/~labrador/LBIS presents additional info and aiding fabric. It includes the entire software program applications and purposes utilized in the textual content in addition to PowerPoint slides and laboratory examples. even though LBIS functions are nonetheless firstly levels, they've got the aptitude to rework our day-by-day lives, from caution us approximately attainable illnesses to tracking toxins degrees round us. Exploring this novel expertise, Location-Based info structures describes the technical parts had to create location-based providers with an emphasis on nonproprietary, freely on hand recommendations that paintings throughout varied applied sciences and systems.
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Extra resources for Location-Based Information Systems: Developing Real-Time Tracking Applications (Chapman & Hall CRC Computer & Information Science Series)
Java compilers are faster because they avoid the translation process on a bytecode by bytecode manner. Java bytecode is compiled into native machine code and run in the hardware as any other compiled program. The compilation of Java bytecode can be done before the program is run, a process called static compilation, or at runtime, dynamic compilation. Static compilation is the usual procedure in which the program is compiled entirely offline and then the compiled program is run. Static compilation produces high quality code but does not allow dynamic class loading and only runs on a specific machine.
The bytecode is executed in the virtual machine, which is on top of the real operating system running on the device. It is worth mentioning that Java is not the only programming language that can be run in the JVM. Any programming language that can be compiled into bytecode can be run as well. The Java ME virtual machine consists of the execution engine, the heap, the stack, the garbage collector, the loader, the verifier, and the thread manager. The description of these modules is based on Sun Microsystems’s Kilo Virtual Machine (KVM), one of the most popular virtual machines built by Sun for resource-constrained devices.
If another unit is now added to the chip, it would increase its capacitance C2 (by an amount that is less than 2C1 ) but would make the whole chip as fast as it was before; however, the voltage needed to run the two units is reduced by half, and the power is decreased by a factor of four! Therefore, important power savings can be achieved by multiple or parallel processors while keeping the computational power constant. Of course, this also brings new challenges, such as finding more efficient ways to perform operations in parallel.