Web Development - Science topic

I agree with Rana Hamza Shakil that an unidirectional data flow is a technique that is mainly found in functional reactive programming. It is also known as one-way data flow, which means the data has one, and only one way to be transferred to other parts of the application. Unidirectional flow means airflow moving in a single direction in a robust and uniform manner and at sufficient speed to reproducibly sweep particles away from the critical processing or testing area. Bidirectional and unidirectional dataflow refers to boundaries, domains, and direction data moves between services and views. Binding refers to a singular one-one-one relationship, while bidirectional and unidirectional refers to the relationship between components. A unidirectional down-flow of clean air ensures that only extremely clean air passes down over the process, protecting sensitive products and processes from airborne particulate. This means that the environment will be free from any particles shed from operatives, and any particles generated from the process. So the Data Flow that we are referring to in the term Unidirectional Data Flow is the flow of application data that goes from the component classes into the output DOM data structures generated by the rendering process, during the top to bottom rendering sweep of the component tree. Unidirectional data flow describes a one-way data flow where the data can move in only one pathway when being transferred between different parts of the program. React, a Javascript library, uses unidirectional data flow. The data from the parent is known as props. If the process is not followed correctly while rendering the data into the DOM, it leads to major issues like performance overhead and so on. This is why we need a unidirectional data flow mechanism, which ensures that the data is moving from top to bottom and that changes are propagated through the system. The flow of energy in the ecosystem is unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis. During the transfer of energy through successive trophic levels in an ecosystem, there is a loss of energy all along the path.The flow of energy in food chain in unidirectional because the sun is the only source of energy for all ecosystems on earth. Then the energy is captured by the autotrophs does not revert back to the sun. Therefore, in the food chain, the energy moves progressively through various trophic levels. A food chain outlines who eats whom. A food web is all of the food chains in an ecosystem. Each organism in an ecosystem occupies a specific trophic level or position in the food chain or web. Producers, who make their own food using photosynthesis or chemosynthesis, make up the bottom of the trophic pyramid.

focused on your project development, create idea and deploy your work in python Flask and DJANGO framework which is most using web development framework in these days.

there are distance education platforms that allow you to create surveys and questionnaires, as well as the possibility of uploading subjects and courses, we use MOODLE, if you are interested I can help you

Software development model in my opinion

As long you are able to demonstrate how your development able to fill the research gap and answer research problem, then it is good enough.

Your development must have its significant to other researchers, not just the public.

Hi my dear friend,

I recommend you to visit this website https://gtmetrix.com/

1) Test some websites : for testing you just need to enter the URL in the field and wait till gtmetrix analyze it.

2) Read carefully the metrics that on which gtmetrix calculate the score.

3) some of them are client side and some others are server side.

for example for the client side by doing these you can optimize the speed of site:

1) minify css and js documents.

2) reduce the size of images ( tinypng.come is very useful)

3) use font icons instead of images

4) learn about css sprite or svg sprite for some types of images.

5) learn about sass and about flat css selectors.

6) try to solve problems with less code. (less is more!!) while coding a website.

7) Avoid css @import. (of course sass @import is not the problem).

But one should not overlook the power and successive updates and powerful support of Laravel

But my suggestion is to you Laravel

Amina, I recommend using a good textbook which comes with lecture slides and labs with instructor's manuals. For cryptography, "Cryptography and Network Security" by Stallings 7th edition is pretty good! It is from 2017, so should have all the latest updates included

SVM

PCA

LDA

EP

ICA

EBGM

TRACE TRANSFORM

BAYESIAN FRAMEWORK

HMM

Some readymade facial recognition solutions :

http://www.ehu.eus/ccwintco/uploads/e/eb/PFC-IonMarques.pdf

Check StackOverflow survey: https://insights.stackoverflow.com/survey/2018/

I will be glad to help.

Regards

The general idea is that you get used to a software and you stick with it.

I know by experience that PhpStorm and WebStorm are really powerful softwares, but they're not free.

When you need to user free software, for which I strongly suggest Sublime Text 3.

Another suggestion: always take in account to spend time to customize your programs, set a nice font, set a nice font size and different plug-ins.

I had a really bad experience with Dreamweaver, but I heard it changed a lot. Still, I prefer Sublime Text above all for its really powerful customization and performance.

In deep customization and overall really good performance. I can count on one hand how many times it crashed in years.

Not a lot of experience with it, but really powerful and stable

It was a really "closed" software that used to correct your code and the performance was awful. I saw that it changed, never used since years.

In deep customization but performance is quite bad, I wouldn't recommend it. Someone says it's better than Sublime, I guess it always relate to "you get used to a software and you stick with it" .

Jumoke Soyemi thanks for this useful information

It is difficult for many SME institutions to pay for web analytics tools. One South African institution has used Google Analytics over almost a decade with interesting results

Just open the page in question, then type

javascript:alert(document.lastModified)

into your address bar.

Cheers!

I came across a web mining solution.

Check these links and I hope they help you:

Hi

this link is useful

List of AJAX Automated Testing and Debugging Tools

I think  OpenQA and Selenium are the popular testing tool that it is today. Selenium helps with functional testing of complex AJAX apps, but there isn’t an equivalent for load testing,  BrowserMob, a new type of load testing service.

Thank you so much for these articles.

Mary

Hi,

I'm not sure to fully understand your question, but it wonder if you are not mixing several concepts.

Indeed, unless a an application runs with root privileges, it cannot open or close a port itself. Ports can be opened or closed at the OS level, for instance using its firewall UI. In other words, MySQL (or any other app) doesn't need to run for its related ports being open or close. In fact, MySQL will not be able to run properly if the port(s) it uses are not open before it is launched. Thus, checking if ports are open or close will probably not be a solution for you. If I'm right (but again, I'm not sure to have fully understood your question), you need to check the traffic on the (open) ports. A right tool to do this is tcpdump. You'll find several examples around, for instance at http://superuser.com/questions/604998/monitor-tcp-traffic-on-specific-port

Hope this helps.

Hi Nikola,

It seems that you are addressing a multiobjective optimization problem with expensive evaluation by simulation. If you focus only on dealing with multiobjective optimization, you may consider comparing your algorithm with some well-known MOEAs such as MOEA/D and NSGA-III in terms of common metrics such as hypervolume and inverted generational distance (IGD). If you want to address both multiobjective optimization and expensive optimization, ParEGO and  MOEA/D-EGO might be candidates for the benchmark algorithms.

MOEA/D: http://dces.essex.ac.uk/staff/zhang/webofmoead.htm

NSGA-III: http://dx.doi.org/10.1109/TEVC.2013.2281535

ParEGO: https://www.cs.bham.ac.uk/~jdk/parego/

MOEA/D-EGO: http://dx.doi.org/10.1109/TEVC.2009.2033671

If you have a bunch of URLs and you have PHP, then a quick 10 line script will give a simple solution.

    - Use file_get_contents to read each webpage into a string (the scrape!)

    - Use preg_match_all to seek the tags within the string (pattern matching)  

This may need to more "stuff/tweaking" depending on the scale of the problem (how many URLs have you to got to check?)

Yes, you can do it. There are number of inbuilt functions in VC++. For these, you write your own programs. It all depends on your expertise in C++  / java. Best of luck

Hi, since the introduction in 2011 the adoption of schema.org seems to have been a little slow at the beginning (Homoceanu et al., 2014). However, the adoption of schema.org have increased probably because it was pushed by Yahoo!, Google, and Bing (later joined by Yandex), see Guha et al. 2016 and Paulheim, 2015. Guha et al. reported that 31.3% of their sample pages used Schema.org as markup, they say that a key driver for the adoption is the extensive support from third-party tools such as Drupal and Word-press extensions and support from vertical-specific content-management systems (such as Bandsintown and Ticketmaster).

One paper that describes the problem of implementing and the designing of website schema.org was written by Tort and Olivé. On the websites I have helped implement schema.org, scripts are used to generate the code using schema.org as a reference and parsers as extracting tools to verify it. Google, Yahoo! and others provide tools to verify the structured data on homepages.

Best regards, Tobias

Guha, R.V., Brickley, D., and Macbeth. S. (2016). Schema.org: evolution of structured data on the web. Communications of the ACM, 59(2), pp. 44-51.

Homoceanu, S., Geilert, F., Pek, C., W.-T., Balke. (2014). Any Suggestions? Active Schema Support for Structuring Web Information. In Database Systems for Advanced Applications, LNCS 8422, pp. 251-265.

Paulheim, H. (2015). What the Adoption of schema.org Tells About Linked Open Data. In Joint Proceedings of USEWOD and PROFILES 2015, pp. 85-90.

Tort, A., and Olivé, A. (2014) A Computer-Guided Approach to Website Schema.org Design. In Conceptual Modeling, LNCS 8824, pp. 28-42.

thank you Pierre, but these are all the mentioned "well known(common)" reasons :)  my point was that the web is machine oriented and having "clean" markup will ease the job of  "crawlers"  for instance  :) any other thoughts?

Hello Zehra, I fully recommend you to focus on a function, you already have it "We want to connect local agricultural communities". why? They should know the best reasons for them to be connected. Once they are connected as an added value, you could then add new functionalities based on their needs, you can suggest them using requests and messuring traffic. Think about facebook, first of all they built a site to share pictures with friends and now it has a lot of additional functionality. Look at LinkedIn, their first aim was for users to have a CV on it and connect with collegues and oportunities, now it has many more functionality. Good luck on it. Regards, Alfonso

@Goran Pavlov, 

The idea is not only to create such site, my research requires this as an initial set-up. Traffic has nothing to do with it. 

But tecnically those website do not perform a search in their own site, but perform searhes somewhere else to show them on their website.

If you want to implement a search engine in your own website you can use Google Custom Search Engine.

You can also add whatever domain or domains you want to get information from and ban sites you dont want  to ever show results.

If I understood correctly, you could use SPARQL queries to query triples. Sesame supports SPARQL.

Hi Neelaksh Sheel,

  You can have a look at a systematic mapping of quality models for web services, where you will find the list of performance metrics (among others) and how they are used/defined.

You can also have a look at the additional resources provided at:

http://gessi.lsi.upc.edu/qmodels/ 

Please find below some of the metrics:

Time behaviour:

- Response time, 

- Execution time

- Network Latency

- queue delay time

- Jitter

- Throughput

Resource utilization:

- Memory used

- CPU used

- Bandwith

- Queue length

- Input size

- Output size

Capacity:

- Maximum throughput

- Load balancing

- Processor speed

- Memory capacity

- Maximum concurrent connection

Hope it helps :)

Best regards,

Marc.

Currently we have reached some frontier where it is exceptionally "expensive" to increase the speed of the logic of a single core. This is the reason why microcontrollers resp microprocessors are currently not getting significantly faster but instead get multiple cores. And supercomputers consist of thousands of cores.

Regarding your original question: for an individual core we haven't yet reached the physical limit, but we are not far from that. But we have already found a way out: parallelism.

So: yes - "computers" can continue to get faster.

Dear Syed,

I you wish to create a static website,basic HTML knowledge with CSS and jQuery is enough...Angular JS will be added advantage.But if you go for dynamic website you should have some knowledge with PHP,Perl etc.

If you are interested to game engines I can suggest Game Engine Architecture (1st link) that offers a complete overview of all the aspects required to develop a game engine. For more information you can see the table of contents (2nd link).

The following 3 articles provide some overview of Web standards and the issues surrounding them. I hope they will be useful.

1) Yesilada, Y., & Harper, S.. (2008). Web 2.0 and the Semantic Web: Hindrance and Opportunity? W4A International Cross-Disciplinary Conference on Web Accessibility 2007, Conference Report SIGACCESS Accessibility Computing

2) Harper, S., & Chen, A.Q.. (2012). Web accessibility guidelines: A lesson from the evolving Web. World Wide Web, 15(1), 61-88.

3) Brajnik, G., Yesilada, Y., & Harper, S.. (2010). Testability and validity of WCAG 2.0: the expertise effect. Paper presented at the Proceedings of the 12th international ACM SIGACCESS conference on Computers and accessibility

hi, you may use one of the online  Performance Report tools for your website, it will give you detailed analysis and recommendations :

hope it helps

thanks all

You could also take a loot at Agile Software Development, Principles, Patterns, and Practices. Robert C. Martin's.

use system function to run the perl script if in windows or wamp server.

system()- Execute command line 

exec() - Execute an external program

passthru() - Execute an external program and display raw output

popen() - Opens process file pointer

escapeshellcmd() - Escape shell metacharacters

pcntl_exec() - Executes specified program in current process space

example

$str_pass="perl abc.pl ".$dir_name;

system($str_pass);

For that matter of problem consult the "Petri net-based method" in which Web Services by adding mediation net to deal with the message mismatches, and the Compatibility issue is resolved by modular timed state graphs..and for the reliable and usable execution paths which satisfies the timed compatibility can be derived to guided service execution and avoid temporal exception..

Many web hosting providers have a free tier or a free trial of their services so you can use their services for testing. Git repositories can be setup to automatically copy across your code to the web hosting provider through scripts associated with hooks.

If you do not wish to write your own scripts, you can use a service such as FortRabbit or PhpFog. Both providers have a free tier and support deployment through Git.

And I like that it's totally frre

Yes, there are models for that but you need to realize that there are different threats and failure modes you might want to protect against. Things can get quite complex very quickly when you mix HA and FT.

In the simplest form, FT H/W can mitigate faults that are bounded to a single machine. RAID storage arrays can mitigate faults bound to physical media. Then HA clusters can address faults bounded to a comprehensive FT machine or a network.

Then you can get into hybrid models, using HA clusters of FT nodes. Ideally, you would want to do so with a heterogeneous OS, to avoid the case where running code hits a driver error causing a crash of Node A. If the same OS/App load is then restored on Node B it is possible for Node B to crash after executing the same instruction set.

If you would like to go one step further you can also add HA Geo units, which are geographically distributed to avoid data center failure. The complexity and investment are unbounded, so it really comes down to what s the cost of downtime and how much of an investment makes sense to prevent that service outage.

Hope that gives you a sense of the possibilities out there.

Depends. Perhaps you should rephrase your question, as there is no "best of all breeds" combination (if there were such a thing, you would not find the high number of different solutions as you do today).

Also, asking for "the best", you'll only get answers like "Java is the best" - "No, C++ rules", which are not helpful.

Questions to consider in your choice:

1. Are legacy systems / components / libraries involved?

2. Do you have budgetary constraints (i.e., does it have to be open source)?

3. Do you have a partnership with a commercial vendor or a policy, where a typical solution framework is preferred, or even mandatory?

4. Do you need a framework for academic purposes, or do you want to commercially develop software (i.e., academic "cleanness" of a framework, vs. "hands-on power" in real-life situations)

5. Which DBMS requirements do you have? Does it have to run on a separate machine? Does it need to support different users? Should it seamlessly integrate into an application? Do you need big data, transactions? Do you need SQL at all?

6. How important is a good IDE? Debugging tools?

7. Last, not least: Availability of people who are familiar with the system (perhaps including yourself) - this might rule out some interesting candidates (typically functional languages).

You see it's not that easy ;-)

there must be some kind of standard which basically taking in considerations three points , accessible , user friendly , and EDI

Yes, in my opinion. NoSQL Databases are more efficient in i.e. knowledge representation. I have developed Association-Oriented Database (AODB) model and I used it during modeling Semantic Knowledge Base. It was very good approach to such problem. But it is not the only way of using another models then relational. It is important to remember Object-Relational Database (ORDB) model is still relational model. It is just a marketing cheat.

That is possible, each of those have different solutions (e.g. http://openid.net/add-openid/) and how you do it depends of you development platform and hosting environment. what is your problem? Start by reading on each id authorization's developer page. (beside open id, you can use facebook, google, or microsoft)

I think the difference is in the approach. Portlet is like a widget, it is not elemental part of a webpage/application. In Mashups [mash is synonym for mixture, hybrid] the emphasis is on the word: "different". It is a mixture of different API-s, different techniques, etc. Mashup can be a widget/portlet, or a whole website and of course, a porlet can also be a mashup.

Very good question, Mudasir. I happened to come over a European technical report with a questionnaire relating the developmental complexity of a Web project. From resulting metrics they could tell you, whether you should use a 'long' or 'short' lifecycle, another term for money spent, IIRC. The whole process was called e-minder. Maybe you can find this online, before I spot it in my papers.

Email the author and ask for the data set. :-).

Not directly associated with design, but contain some interesting information about financial impact: