http://hutorny.in.ua Programming in a small Fri, 15 Jan 2010 19:52:10 +0000 http://backend.userland.com/rss092 en Introduction ObjectTeams/Java (OT/J) is an extension to Java programming language that facilitates roles and collaborations as the first class language constructs. This article is an exercise on using (OT/J) for implementing collaborations. Subject area This exercise considers two bank operations – money transfer and fund cashing. The course of events for these two ... http://hutorny.in.ua/java/exercise-on-implementing-collaborations-with-objectteams-java Graphs, networks and trees are commonly used to model application domains. In some cases these structures are highly dynamic and can not be defined at design time. Yet there are also cases when they are rather static and do not change during the application life cycle. An example of such ... http://hutorny.in.ua/java/using-java-langauge-constructs-to-define-static-graphs-and-trees Where to keep SQL statements? This question arises almost for any more-less sophisticated Java application that accesses DBMS. Two most common approaches are: (1) as string constants in Java and (2) as text in external files. Both these approaches have significant drawbacks. Java strings get complicated when a string is ... http://hutorny.in.ua/java/a-convenient-approach-on-keeping-sql-in-java Abstract A dimmer is an electronic device that controls alternate voltage applied to a lamp through delivering a selected portion of the mains sinusoid. Engineer, designing a dimmer needs to estimate how big this portion should be to get a desired luminance level. This article uses a model of incandescent lamp, ... http://hutorny.in.ua/research/theoretical-aspects-of-dimming-an-incandescent-lamp ErWin 7.2 does not provide support for PostgreSQL, indeed with few tricks it still can be used to model database and generate valid SQL code. (Note: In ErWin 7.3 templates look very different from 7.2, but nevertheless, I believe, similar approach still can be applied). Trick 1. Use ... http://hutorny.in.ua/misc/customizing-erwin-templates-for-postgresql This is a maintenance release of the product that includes the following fixes: 1. SISAN v 1.1   1.1. Added SISAM88 hardware schematic   1.2. Fixed TX/RX typo on SISAM690 schematic   1.3. Fixed issue with beam pattern affecting ruler pattern 2. SISAM1 v 1.1   2.1. Fixed diagnostic failure, which made product unusable if high baudrate cannot be set   2.2. Fixed issue with BREAK is ... http://hutorny.in.ua/projects/w32/sisan/simplescope-v11-released Previous examples illustrated VELOOS programming aspects. This post provides an example of using object oriented paradigm for designing VELOOS application. Unlike the previous examples which were purely programming exercises, this example is dedicated to a utilitarian home appliance application and provides a "reference design" for ... http://hutorny.in.ua/projects/pic/miha675-multi-input-hall-automaton This example for PIC12F675 implements set of "actuators" and "generators" controlled via USART. Actuators produce one 300 ms pulse when it receives command 'ON' and three 100 ms pulses delimited with 100 ms spaces (pauses) on command 'OFF'. Generators, when turned on, produce pulses and spaces of the specified duration ... http://hutorny.in.ua/projects/pic/veloos/veloos-example-3 VELOOS is an object-oriented message-triggered cooperative operating system for 8-bit Microchip microcontrollers licensed to public under the Open Software License Release 1.0 includes VELOOS kernel and two timer drivers (TMR0 and TMR2 based). It has been tested on the following devices: PIC12F675, PIC16F690, PIC18F248. Download VELOOS v.1.0 Supporting other 14-bit core and 16-bit ... http://hutorny.in.ua/projects/pic/veloos/veloos-10-released This post continues series of examples and describes how VELOOS can be used for implementing time-triggered applications. Example2 - Heartbeat Driven PDO Design idea: Enhance previous example with a timer and two PDOs processing timer messages. Use EEPROM to keep instance-specific data. Value: Gives a simple example of implementing (1) time-triggered PDOs, (2) reenterable classes. Implements ... http://hutorny.in.ua/projects/pic/veloos/veloos-example-2