Computer Science

When I input my username and password to my banking sites, and other sites, the site usually takes several seconds to analyze my input and regard it as valid or not. Let's start there. . I've read that brute-force automated techniques are used by hackers to get into peoples' sites; however, if it takes several seconds to analyze a username and password, and the hackers have to try millions/billions of combinations of usernames and passwords, it would take weeks! Or longer. And that's just working on one account. Am I wrong here? . My point is if a person's computer hasn't been hacked for stolen data, or if a person's login info hasn't been found out physically (fr…

nobody can use my formulas or my fractal formula and this copyright lasts for the next ten years even if you take this down

Hello SF, I have a wi-fi router. Some 5 of us are sharing the network. Although the signal seems strong, the network is slow most of the time. I believe someone is eating too much of speed by often downloading video files of huge size. Is there any way I can configure the modem such that, certain sites remain restricted for use or it would be still better if I can completely restrict opening any video contents. Any kind of help/suggestion is very much appreciated Regards

Hello SF, I have a doubt regarding the sync process of Inventory management in a e-commerce business. Assume, that I run a e-commerce business. I will have an inventory management software to manage my inventory, manage incoming purchase orders, etc. However, my doubt is how will the data from the e-commerce website be sent to the Inventory management software? CAn anyone please explain me or atleast suggest me some good books where I can learn the process? Regards.

Hello, I am doing a project in R and am interested in creating a list of vectors of TRUES and FALSES as follows: FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE TRUE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE TRUE TRUE ... TRUE TRUE TRUE TRUE TRUE I have manually typed all 32 combinations; however, I am interested in doing this more elegantly. I imagine a loop and some sort of modulus operation are required. Any advice would be appreciated. Thank you!

Hi I doing unsupervised machine learning experiments. I used K-means algorithms however my question is how can I evaluate how good the data was grouped. I found something called Validity index. Would you please guide me how to evaluate clusters. Thanks

Convert -128 ( decimal) to binary,representing the number with Two's complement with 8 bits...when I convert it to binary it is 10000000..so it is already 8 bits, if I put the bit of sign then it is 9 bits...110000000 I also have to convert 115,375 (octal) to binary representing the number with 16 bits,but when I convert it I have 001001101,011111101..which is far more than 16 bits..where am I wrong?

Convert 7 and -7.25 to twos complement with 6 bits and add them.So , -7.25 is smth like 1001,01. When I add 000111 to it,the result is 1000,01...and if i convert this to twos complement the result is not -0.25...whats wrong?

I would be very greatful if someone could point me in the right direction. While I understand this to be the execute sequence for a PUSH in register transfer language: [AC] --> ALU --> ALUB [ALUB] --> MWB [sP] --> MAR [MAR] --> Address decoder [MWB] --> M [sP] + 1 --> SP I am unsure as to the POP instruction. Would it be the opposite of the push i.e. [sP] - 1 --> SP M --> [MWB] Adress decoder --> [MAR] or is this completely wrong. Any help would greately appreciated.

Hello, I have a small problem but I need quick help. For a few weeks I'm reading about Machine Learning issues, and in particular ML methods used in Information Retrieval problems. I try to find application ML in IR which is especially important in the last 3-5 years (not 10-12 years), and it is possible to perform a very simple test in WEKA, KNIME or Mloss programs. What kind of applications would be easy to implement in these programs for the ML beginner ? What do you think?

'I'm doing a research project titled"a polynomial model for bone fracture problem using line detction and need to learn about modelling bone fractures using line detection. Is anyone familiar with this at all?' The major problem i am facing is i currently do not have an idea about the topic and my supervisor is not ready to give me a new topic. please i need help!!! thanks in anticipation.

Hi, I am working on building a Class Hidden Markov Model consists of submodels which are connected as a whole model. The whole model is trained by Baum-Welch algorithm. I use training sequences which are DNA sequences of length 5000 to 10000 nucleic acids (samples). Because the training sequences are long I am facing an underflow problem in the training of the model. I used the LOG function in the calculations and I used scaled HMM but this did not solve the problem. Does any one have a better solution for this problem?? Thanks, Saj

can anyone help me with modelling of systems. i want to model a physical system and load it into computer for some simulation and testing purpose. the physical system includes two non-interacting vessels whose independent levels must be controlled through simulation in software like matlab. if i could get the basic idea on computer modelling of systems, it will be helpful for me to develop from it. the flow, pressure and volume can be adjusted or varied. two vesels contain different liquids. thanks in advance. please respond if anyone has got even a little or basic idea. thanks

i'm taking a computer science class in school and having a tough time understanding parameter passing and creating methods. i have this assignment i need to do that asks for the following: The program first asks the user to enter three rational numbers (fractions). Then the program finds the rational numbers that reperesent the maximum value and the minimum value and prints them (as rational numbers). Finally it also prints the average of the three rational numbers as a rational number too. For example, if the user enters 1/2, 2/5 and 3/8 the program must print the following: Maximum: 1 / 2 Minimum: 3 / 8 Average: 17 / 40 ive made a bit of progress so f…

Hey guys, I just finished my basic calculator in HTML/Javascript and I was wondering if anyone would be able to test it out. The coding isn't going to be 100% perfect since I'm fairly new at it and the teacher hasn't taught us all the ways to do things. So right now, I'm mostly looking to see if it works. Valid entries include #operator#, then hit =. Please don't enter like -4*+8. Both numbers can be negative, as well as decimals, but with one operator in between or in the case of a negative (-#*-#) is okay. I attached a notepad file of the code. Thanks! theADOLESCENT Edit: I can't find where you guys would see the attached file so I'll use t…

My question may sound crazy. however, I would like to know if a message sent as an SMS through mobile can be read automatically in a website. The website has to receive the data from SMS, process it and has to send a suitable reply as an SMS to another mobile. All this process has to be carried out in autonomous manner. Is it possible? Regards.

I am trying to make an application with C++Builder which communicates with a PIC16F877A which has a RS232 interface. Unfortunately my computer only has USB ports so I have bought a USB to RS232 converter cable. Well I am a complete beginner to C++ Builder so really at this point I don't even know it will be possible to do this... Any help and advice would be really appreciated.

Hey guys the name is Xavier. I have a question for all of you Computer Scientists out there. I really and truly want to get a Computer Science degree and I'm trying everything I can. From reading programming books to keeping up with different topics (Science, Math, History, so forth and so on). Now I've recently been studying up on Java and I'm picking it up real quick. But I've noticed something. I know the ins and outs of it so far. Like I can tell you the different data types and operators, things of that nature. When programs are brought up in the book, I can sit down and tell you what each expression is and statement and things like that. So I have no problem reading…

OK, so I'm in a Software Engineering class and we've just been assigned to groups for a project. Our project is to design an object-oriented system using the Unified Process. We can pick whatever system we want; some one suggested a system that does inventory for a bookstore. I don't know, that seemed a bit dull. So I'm looking for some other ideas that are more interesting - but not too complex as this is our first Software Engineering class and we only have until the end of November (of course we won't be constructing or implementing it, just going to end of Design/Elaboration phases). We are voting on a project Thursday so I need to have some good ideas by then! ...So,…

I'd really appreciate if someone could tell me how to determine the variable order in a truth table e.g. how should we go about creating a truth table for the Boolean expression (y.x)+w? Are we supposed to list these Boolean variables in alphabetical order: w|x|y|(y.x)|(y.x)+w 0|0|0| 0|0|1| 0|1|0| 0|1|1| 1|0|0| 1|0|1| 1|1|0| 1|1|1| Or do we list them in the order they appear in the expression(left to right): y|x|w|(y.x)|(y.x)+w 0|0|0| 0|0|1| 0|1|0| 0|1|1| 1|0|0| 1|0|1| 1|1|0| 1|1|1|

Hello every One!!! Plz suggest a topic for my master thesis!.... My domain is software engineering and I am also interesting in Databases and Object analysis and design (OOAD). I dnt have any idea about thesis topic selection Thank In advance

Simple question really, what free graphics rendering software do people here have experience with and would you recommend it?

Hi guys. I need some help on constructing an algorithm. The question is: Derive an algorithm to store the elements of a table with size n by n in a computer memory using row major. Obtain the elements of the table by: 1. Row 1 Column 1 has the value 1; obtained by (1*1) 2. Row 2 Column 6 = 12 (2*6) 3. Row m Column n = mn (m*n) All help will be gladly accepted and appreciated. Thanx!

Hi... I'm new here... I want to change my Bios splash screen logo.. My Motherboard: Intel D945GCCR OS: WinXp Sp2 Thanks IN Advance

Lets say I have a Variable Partitioning with free space: at address 32k a free space of 8k, and at address 15k a free space of size 11k. I need to create a first fit free table. and a best fit free table Am I doing the right thing for both of the tables please help +--------+-------+ |address | size | |32 |8 | |15 |11 | +--------+-------+