Technology Articles Blog
A decision table represents the comlex decision logic associated with a data-processing job. A decision table summarized the action to be taken depending on the values of conditions that exist at the time the decision table is consulted. Decision tables override system flow charts in more complex circumstances, particularly those where several criteria determine an…
A system is a set of interacting elements that responds to inputs producing outputs. The events which together make up the development, operation and maintenance of such a computer system or information management system may be referred to as the ‘System Life Cycle’. The different elements of a system life cycle are – 1. Initial Study –…
Regular Falsi method is a numerical method to derive the root of a polynomial. The advantage of Regular Falsi over Bisection method is that the convergence is made faster. Below is explanation with a graphical representation and the solution –
Bisection method is the most simplest method of solving algebraic or transcendental equations. It involves selecting an interval [a,b] in which the root lies such that f(a)f(b) < 1. Below is a detailed solved version to find root of x = e<sup>-x</sup>. Enjoy!!
This is a core question that we need to ask when we talk about SOA (Service oriented architecture). SOA connects enterprise components within and outside by easy integration, coordination and loosely coupled processes that can be coupled easily. The main theme that comes up when the number of interacting components increases is the complex messaging…
Newton Raphson method is the core in computer Numerical analysis software programs to find root of equations such as e<sup>-x</sup> = Sin X. Complete solution is as below –
One of the most sought tools for a web designer / UI expert / anyone who wants to mock up a user interface based IT system/software is a wire-framing tool. Wire-framing is nothing but building screen / user interface mock of the targeted system which could be used as the medium to convey the user…
There are multiple Java based REST frameworks that is use today. Some of the top players are as below – 1. Reslet – http://www.restlet.org/ 2. Apache CXF – http://cxf.apache.org/ , http://cxf.apache.org/docs/jax-rs.html, http://jax-ws.java.net/2.2.7/docs/ 3. JAX-RS Reference implementation – Jersey – http://jersey.java.net/ All of the above frameworks supports J2EE resident Webservice API for…
HTTP methods are convenient methods that an outside process can use over simple http transport layer. For example REST (Representational transfer technology) uses http methods to communicate back and forth between resources/entities. There are two basic kinds of http methods – Safe and Idempotent methods. Simply put, safe methods are those methods (GET, HEAD) which…
The core concept behind Service oriented Architecture (SOA) is that it is focused on enabling design and implementation of business process as individual service components (in the form of software) which is loosely coupled and easily discoverable so that inter and intra business processes can interoperate easily and businesses can adapt to changes very quickly….
Product requirements need to be treated with suspicion as if they really needed for the essential capability for a product release. Always prioritize product requirements and keep the bare minimum and most needed requirements on the top of the product backlog with fine-grained description of the requirements which could be easily implemented using any development…
One would think that the a product’s success is directly proportional to the amount of complexity that it offers. In other words, majority of people think that a software product could be successfull only if it buries the user with complex features and functionalities. However it has been proven that the rule of thumb is…
Agile software development methodology is suitable for time-boxed iterative system development scenarios. The software product is released as various versions or releases, typically in time-boxes of a month. Agile development assumes and welcomes delays and late requirements or scope changes even during development/testing phase! Agile software development might not be suitable for all software development…
Solving 1.5x – tanx – 0.1 = 0, using iteration method – Iteration is a method of solving algebraic or transcendental equation and is widely used in computer mechanics and programming algorithms. A hand-written solution is as below –
Solving x = 1/ (1+x)1/2 using iteration method – Iteration is a method of solving algebraic or transcendental equation and is widely used in computer mechanics and programming algorithms. A hand-written solution is as below –
Outside caliper is a two legged precision instrument used for measuring or comparing thickness diameter and outside dimensions. The legs are tapered inwards and their ends are thin to make accurate measurement. The size of this caliper is found by taking the perpendicular distance from the center of the rivets to the leg points. If…
Micrometer is a precision instrument which is able to take delicate measurements of all classes of materials. In the classification of sizes, what is known as a one inch micrometer will measure from 0 to 1” and a two inch make from 1” to 2” and three inch make from 2” to 3” and so…
Vernier Caliper is a precision instrument which is used to measure and record data such as length, breadth, thickness etc of a body. The principle parts are fixed jaw, movable jaw, beam or blade, fine adjustment screw and fine adjustment clamp. The graduations are marked on the beam. The beam has a fixed jaw at…
Fitting is the assembling together of parts and removal of metals to secure necessary fit. Following safety measures need to be taken in fitting workshop – 1. Files must have well fitted handles 2. See that work piece is perfectly clamped or fixed in the vice. 3. Never use hammers with loose heads. 4. Use the…
Events and States are differentiated below – Events States Anything that happen in time Shows the attributes values of object at a particular point in time An event separate two states A state separates two events An event is said to have happened without regard to whether it changes a state or not A state…
Actors: Actors are objects represented in the functional model that produce or consume data. An actor may store some data for further processing steps. Data Stores: Data stores are store house of data represented in the functional model. A data store could only store or consume data, but could not produce data. Below is an…
The state diagram may be drawn by considering the concurrency property of the aggregate objects that make up the car object ie. each aggregate object has a state of its own. Below is a sample state diagram for a Car object – Below is the state diagram for Ignition System – State Diagram – Transmission…
Below is an example of implementation of multiple inheritance – The Class ‘Universal’ inherits from two classes A/ and D/C, thus exhibiting multiple inheritance. Mutiple inheritance could be avoid by creating new class as below – Universal Motors run both under A/C and D/C
1. Classes and Objects In an object oriented programming language, we code the program as a corporate collection of objects which are instantiated from various class abstractions. A class is only a logical abstraction and has no physical existence. An object is a specific instance of the class and it has physical existence inside the…
Abstraction may be defined as all those essential characteristics features of an object class which makes it different from other object classes. Abstraction as applied to inheritance refers to the specific features defined for each subclass in the class hierarchy. Such a representation of the object class including only its essential attributes and operations, leaving…
Multiplicity refers to the number of object class instances of one class may be associated to the other class. An n+ symbol indicates that there can be n or >n associations of the object class near to the n+ symbol to the other associated class. A solid ball indicates 1 or >1 associations and a…
Inheritance is the most basic feature of any Object Oriented programming language. It refers to the derivation of sub classes from a base/super class. The inherited sub classes inherit the common / basic features of the base / super class at the same time implements their own specific features. Inheritance helps us to reduce the…
Qualification is an association which involves an association and a qualifier which uniquely identifies certain features of one of the associated classes. Below example explains it. Multiplicity of association changed from many – many to many to 1. Stock exchange + Ticker symbol = Company
Object Modeling Technique used in object oriented modeling and design which use the usual principles of system development like analysis, design an implementation but applying object oriented software design. Using OMT, we model design and implement the system in terms of real-world objects in the application domain. This involves the use of three different system…
A sample instance diagram is as shown below. The diagram represents a expression evaluator –
Aggregation refers to combining the assembled parts of a single part. In terms of Object Management Technology, aggregation may be defined as representing the object classes as a hierarchy such that the object class at the root may only be visualized by aggregating other object classes in the hierarchy or in otherwords aggregation relates an…