Blog by alisha ansari | Digital Diary

Requirements modelling behaviour pattern

after our discussion of scenario based and class based model in chapters resonable to ask area those requirements model representation enough the only responsible answer it is that define depend for some type of software the use case may be the only requirements modelling representation that is required for others and object oriented approach in choose and class based model may be developed but in other situation Complex application requirements may demand and examination of how and application behave as external event.

Identifying events

with the use case that you learn that the use case represent a sequence of activity that involves after and the system in general and event of cures whenever the system and an actor exchange information and event is not the information that has been exchange but rather the fact that information has been exchange use case is mind 4 points of information exchange to illustrate the considered the use case for a person of the safe home security function....

state representation

in the contact of behaviour modelling to different characterization of states must be considered the state of each class a system perform its function and the state of the system as observed from the outside as the system perform its function the state of a classes tax on both passive and active characteristic passive state is simply the current status of all and subject object...

Component level design

component level design after the first ration of design has been completed at this stage the oral data and program structure of the software has been established the ancient is the translate the design model into operational software but the level of abstraction of the exciting design model is relatively hi and the abstraction level of the operational program is lower the in translation can be challenges...

what is a component

a component is a modular building block for computer software more for friendly the OMG unified modelling language specification define a component as a modular developer and replacement part of a system that exception implementation and exposes is set of interface...

an object oriented view

in the context of object oriented software engineer a component consent is set of collaborating classes each classes within a components has been fully elaborated to include all are tribute and operation that are relevant to its implementation as part of the design elaboration all interface that enable the classes to communication and collaboration with other design classes must also be define

User interface design

we live in a world of high Technology product and Virtually all of them consumer electronic industrial equipment automobile corporate and system and required personal computer software successful it must exhibit and good usblity a quality major of the is and efficiency with which a human can employee the function and feature afford by the high Technology product..

definition

for the first three decided of the computing Era visibility we was not in dominant concern among those who built software in this classic book on design Donald Norman a good that it was time for exchange in attitude...

the golden rules

the model coins three golden rules plays the user in control reduce the user memory load and make the interface conscious these called the rules actually from the basis for a set of user interface design principle that guides is important aspect of software design ....

user interface analysis and design

the oral process of analysing and designing a user interface beam with the creation of different motor of system function as received from the outside you being by dealing nating the human and computer oriented task that are required to achieve system function and them consideration the design issue that a blood to all interface design

Pattern base design

each of us has encounter a design problem and silently wounder if anyone has developed is solution for this the answer is almost always yes the problem is finding the solution in sorry that it does in fact with the problem you have encountered standard understanding the constant trained that may restrict the manner in which the solution is applied and finally translating the propose solution into your design environment..

. design patterns

ke design pattern can be characterized as a three part rule which expresses a relation between a certain contact a problem and a solution for software design contact allow the leader to understand the environment in which the problem residence and what solution might be appropriate within that environment is that of requirement including limitation and concentrated system of force that influence is how the problem can be interpreted within its context and how the solution can be faculty applied...

kinds of patterns

one of the reason that's software engineer are interested in design pattern is that human being are inherently good at patent recognisation it we want we be frozen in space and time unable to learn from past experience and wheeling two venture forward because of our nability to recognise solution situation that might have lead to high risk

Software quality assurance

the software engineering approad describe in this book work toward is single gold a produce on time high quality software yet many readers will repeat challenged by the question what is the software Philips crop c in this Landmark book on quality provides a very answer to this question the problem of quality management is not what people do not about it the problem it was they think they do can in this regard quality has much in common with everybody in for it under certain contrition condition...

background issues quality

control and assurance are essential activities for any business that produce product to be used by other prayer to the 20 country quality control was the soil responsibility of the craft as Timepass and mass production techniques become complaints...

elements of software quality

assurance software quality assurance and compasses a board range of concern and activities that focus on the management of software quality this can be summarised in following manner standard..

standard

The Other standard organisation have produced about array of software engineering standard and related document standard may be adopted volume by a software engineering organisation or imposed by the customer or the stack holder

Flooding

routine algorithm is implemented is rotate must make decision based on local knowledge not the complete picture of the network is simple local techniques with loading in which every incoming packet in sand out on every outgoing line except the one it arrived on...

definition

with a hope account can produce an expansion number of duplicate packets as the hope count grown and routers duplicate packet they have seen before a better technique for damage the food is to have router keep track of which packet have been fluid to avoid standing them out is second time on way to achieve this girl is to have the source but sequence number...

link State Routing

this and vector routine was used in the until 1979 when is replaced by Link state routine in the primary problem that cause it's demise was that the algorithm look too long to coverage after the network topically change due to the count to Infinity problem...

Multiple access protocol'

many algorithm for allocating a multiple access channel are in the following section we will study a small sample of the more interesting one and give some example of how they are commonly used in practice..

Aloha

the story of our first and ac start our in Pristine Haveli Hawaii in the early 1970 in this case Prestige can be interpreted as not having in working telephone system this is not my life more pleasant for researcher Norman abroad man and his colleges at the University of Huawei who were trying to connect user on remote land to the main computer in Honu Lulu...

pure Aloha

The basic idea of an Aloha system is simple late user transmit where they have data to be sand there will be collection of course and leading friends will be them is standard and made some way to find out if this is the case in the system after each station has send its Prem to the central computer the computer labradors cast the all the station..

career scenes multiplexes

protocol with floated Aloha the best channel utilisation that can be achieve this low result is hardly surprising scenes with station transmitting at will with out cannoving what the other station are doing there are bound to be many collision..

chennel allocation

The channel allocation problem the central theme of this chapter is how to locate is single broadcast channel among competing user the channel might be a person of the wireless subtraction in a Geographic region or single wire or tropical fibre to which multiple needs for connected it does not matter is both cases the channel contacts each user to all other user and any user who makes full use of the channel interface with other user who also wish to use the channel we will first look at the shortcoming of static allocation scheme for brusty channels..

. static channel allocation

that traditional way of allocating a single channel such as a telephone Trump coming multiple completing user is to chop up its capacity by using one of the multiplexing screen such as MDM Frequency division multiplexing if there are user the bandwid is divided into an equal sides portion with its user being assign one question is user has a private frequency band there is now to Interface among user...'

assumption for dynamic channel allocation

before we get to the fight of the many channel allocation method in this chapter is worth while to carefully formulate the location problem underline all the work done in this area are the following 5 key assumptions...

Independence traffic

the model consist of Independence station computer telephone each with a program or user that generates famous of Transmission the accepted number of generated is an interval of length where is a constant the arrival rate of new frame once a frame has been a little the station is blocked and does nothing until the frame has been successfully transmitted...

Ethernet

we have now finish our discussion of channel allocation Protocol in the Abstract so it is time to see how these principal apply to real system many of the design for personal local and metropolition areas network have been standardised under the name of some people who believe in rainy season come back as in member of the standard association to without the unfit...

what is classic Ethernate

physical layer the story of athlete is start about the same time as that of Aloha when is student named both medicals goat his bachelor degree at than the move of the river to get his Harvard during his studies he was export to Abraham a work he becomes on interested in it that after graduating from Harvard he decided to spend the summer in Haveli Huawei working with abrosham before starting..

classic ethernet

m.ac Sab layer protocol the format used to send frame is shown in first common premable of 8 by each containing the 10101010 with the exception of last bite in which the last to BITS are set this last bite is called the start of frame delimetre

Broadband wireless

we have been indoors to long let us go out doors where there is quite a bit of inter fasting interesting networking over the so called let smile with the delegation of the telephone system in many countries competited to the intensive telephone companies are now often allowed to of a local voice and high speed internet service there is certainly plenty of demand the problem is that running fibre of Cox to million of homes and business is ability expensive..

.Architecture and protocol

is tag the 802.6 is showing in base station connect directly to the provider backbone natwo which is in Run connected to the internet the big station communication with station over the wireless I interface to kinds of station by station remain in a fixed location for example internet access for homes mobile station can receive service will they are moving...

what is the sub layer protocol

the data link layer is divided into 3 supplier as we serve in it is the difficult to explain how high security some layer work surface is to say that any patient is used to keep secret all data transmitted only The Fame failure and crypted the header are not this property means that a snooker can see who is talking to whom but cannot tell what the are same to each other