Apache Cassandra Database is highly scalable and available platform for distributed database systems with no single point of failure.It is employed in commodity servers that deal with large sets of structured data. It is free, open-source (source code can be changed at any point of time) and possesseslower latency making it survive regional outages. It is driving many of today’s modern application businesses.
Cassandra serves both real-time operational store database (online transactional applications) and read-intensive database (large scale Business Intelligence system). It does not support a fully relational data model, instead, it supports a simple data model with dynamic control of data layout and format.
Cassandra is flexible in its data storage as it stores all kinds of unstructured, semi-structured and structured data across data centers as well as cloud. Changes to this data can be updated as per the need. Cassandra ensures strong security and also lowers Total Cost of Ownership (TCO).
Some of the key points include:
- Cassandra is consistent and fault-tolerant
- Its database is column-oriented
- Created on Facebook, it completely differs from RDBMS
- Successfully employed and deployed by some of the notable enterprises like Twitter, Netflix, Cisco, eBay, etc.,
- Its design is inspired from Amazon’s Dynamo, and
- Its data model is inspired from Google’s Bigtable so that it avails maximum flexibility with quick response time.
- It supports simple transactions with both read and write scalability.
- Cassandra Query Language (CQL, just like SQL) moves any kind of RDBMS to Cassandra.
Tools like nodetool (command line management) and Cassandra-stress (load-stressing a basic benchmarking) are installed in Cassandra by default. Cassandra supports numerous language drivers so that any kind of applications can run optimally, be it: Python, Ruby, Java, C++, etc.,
Cassandra architecture is designed keeping in mind the fact that “system hardware errors can and do occur”. The architecture is distributed and data is placed on different machines. It is a type of NoSQL database, but Cassandra’s architecture is forefront, making it even outperform NoSQL alternatives in real applications. Its architecture is built-for-scale, which means it can handle petabytes of information and thousands of operations per second, independent of special hardware or software.
Cassandra runs on a single daemon. To run a program, there is no need of a complex set of configuration, locking, and other services.It is far from the legacy concept of “master” node, and all nodes are identical and communicate equally with each other. Its design is in the form of a “masterless” ring with the multi-master approach, that is easy to setup and maintain.
Here the circled numbers in red represent nodes, whereas the interlinking in blue represents distributed architecture. In the image above, the client is sending data to the various nodes present in its architecture. Operation and scale out are simple and none of the nodes havea special role.
Cassandra complementing Hadoop
Apache Cassandra is complementing Hadoop as it comes out as a perfect choice for online Web and Mobile applications and has a batch-oriented data warehouse environment which aids processing of colder data for the purpose of analytics.This enables any IT Organization to effectively support analytic “tempos” required for the efficient run of business.
Apache Cassandra Developers develop and work on projects. They also develop applications that leverage on databases.Cassandra training helps both the Administrator or Architectwith knowledge on the latest advancements in Cassandra and you can land in a decent job if you are a fresher seeking a job. You learn to implement appropriate use cases using the highly scalable database.These days, the job market for Cassandra is on a high rise, growing at a rate of 300%. Hence, it is high time to take a step towards Apache Cassandra.
IPTV refers to multimedia services that are transmitted through an IP network. This is the current trendin television broadcasting that provides viewers with high quality entertainment experience by allowing interactivity. It enables viewers to choose their own programsunlike in the case of traditional television where consumers can’t enjoy the same privileges.IPTV technology broadcasts single signals as compared to others using simultaneous program broadcasting. This technology is very reliable, convenient and efficient.IPTV supports multiple multimedia video codecs such as MPEG2, MPEG4. The beauty of IPTV is that viewers can easily record their favorite television programs to watch them later. They can also watch latest movies online via Video on Demand services.
Common terms used in IPTV are:
Internet Protocol Television (IPTV)
IPTV refers to the process of providing multimedia entertainment in video or audio format through internet protocol networking from your local telecommunication network. This kind of television transmission is becoming more popular in modern world. One is required to have enough broadband bundles for uninterrupted television services from your broadcasting company.
VoD refers to video on-demand. It enables viewers to request multimedia content such as movies and music from television services providers. They can either watch these videos through live streaming or record them for later viewing. Video on demand makes it easy for viewers to enjoy uninterrupted real time programs online wherever they are.
When IPTV consumers are able to watch high quality videos via the internet it’s referred to as video streaming. The viewers request for the content online and receive them after data synchronization. To enjoy this kind of multimedia transmission you require to be connected to the internet.
Set-top boxes are electrical devices that make IPTV channelswatching possible. They are normally bought in electronic stores either online or physical then installed in viewers’homes. They only function efficiently when being connected to multimedia devices such as television sets, laptops, PCs,etc. They enable the IPTV clients to receive video signals on their preferred electronic devices. They are normally categorized under two groups which are basic and hybrid. Consumers purchase them according to their functionality, quality, prices and models.
This refers to the software that enables interactivity in IPTV. It makes it possible for viewers to enjoy numerous interactive media services such as VOD, real time HD TV, MOD,DVD,radio and camera among many others without any restrictions.
This refers to the IPTV testing process after a successful installation. It’s normally done to ensure that everything is functioning properly for customer satisfaction. After IPTV testing viewers are able to enjoy high quality television services through internet data networks.
Summary: A lot of people in Bangalore are starting companies that provide Bangalore Escorts Service. So if you need an escort, you can contact these agencies in the city.
The business of providing escorts services is no different than any other business. You need to remember this if you are planning on starting one. Just like any other business, there are legal formalities to be done, and laws to be followed while setting up the company. The Independent Escorts In Bangalore only difference is that the things you need to worry about in this business vary from any other business. Other businessmen worry about assets and manufacturing units while you need to stay informed about the escort laws of the country or city. It is the most important part of this business.
The Legal Steps
Every country has a different set of law. So you need to make sure the laws of the country permits the business of Bangalore Escort. Once you get clearance from the law, you can start your escort company. Just like any other business, you need to pay taxes, and get a proper license for continuing with the business. You can advertise for your company on the internet. There are many websites who rates and advertises various escort agencies.
Getting A Review
You need to make sure your company gets high rating in these websites. Many clients contact Bangalore Escorts basedon the data provided on these websites. Providing good service will automatically get you good reviews and ratings. You can’t just send girls out to meet strangers in the name of providing escort services. You need to understand your client. Make sure you know what kind of girl he wants to spend time with and then pick someone accordingly. Otherwise, the whole time is wasted for both the girl and the guy.
Protecting The Girls
There are many types of services provided by companies. There are telephonic, out-call and in-call services. Telephonic services are rare, and the girls need to go on out and attend in-call meetings most of the time. It is the responsibility of agencies to make sure these meetings are safe for the girls. In case of an in-call service to a client, the place of meeting should be somewhere convenient and safe for the girl and not her residence. It is important for an agency to keep the address and contact number out of the clients reach.
Technology titan and Apple competitor Samsung has announced that they are set to unveil another addition to their latest technology gadgets. It has been a long wait, but the Samsung Galaxy S2 will have its successor in the new Samsung Galaxy S3.
Samsung smartphones have become a real success with the help of their mobile operating system, Android. With that, the Samsung Galaxy S2 was a real success to consumers who have it (I have one as well). But come 3rd of May, as what the press invitations have stated, Samsung will have a better surprise to everyone. So don’t get shocked if they announce and unveil the new Galaxy S3.
On May 3, Samsung’s latest technology gadgets will be unveiled.
No one can definitely tell the exact specifications, or the exact hardware look of the new Galaxy. But a few hopefuls would want the latest smartphone to be smaller than the Galaxy S2. Compared to its close rival iPhone, the Samsung Galaxy S2 is relatively bigger, and even compared to most smartphones in the market! With that, everyone wants it to be more convenient and conventional by making the successor’s size smaller.
Just like any other tech rumors, there are a lot of websites who has posted some hardware specs that the Galaxy S3 would or might have. GSMArena is just one of those many sites that we were referring to. According to the website, the new smartphone will make use of the latest 4G network, and its dimensions are 131.3 x 63.7 x 8 mm. It will have full touch screen capability, with 720 x 1280 pixels on a 4.7 inch size screen.
The phone’s memory is also quite a treat, with a card slot that supports up to 32GB and internal storage of either 16 or 32 GB. It will also house a 1 GB of RAM. The Android OS v4.0 (Ice Cream Sandwich) will be used on the Galaxy S3, and a Exynos chipset. It will have a Quad core 1.5 GHz of central processing unit.
Data transfers available for this smartphone are GPRS, EDGE, WiFi capable, Bluetooth, NFC, and USB.
The back camera will be a 12 mega pixel cam, with 4000 x 3000 pixels. Added camera features are autofocus and LED flash.
Well, these are the rumored features that we found on GSMArena. We can never tell if these are the exact specs that the Samsung Galaxy S3 will be having. But come May 3, every question about this new and exciting smart phone will be answered.
Network Optimisation is a critical component in the effective management of information systems. Information technology is growing at an exponential rate – with more and more applications consuming greater amount of network bandwidth as well as business users producing larger volumes of data from these applications (which in a majority of cases has to flow through the corporate network). This continued growth adds to the strain of an already over-stressed network architecture within an organisation.
This situation is unlikely to improve as fast as the technology and computer usage rates increase. The only viable solution from the corporate management point of view is to improve the IT infrastructure and data flow management within the company.
The phenomenon is especially noticeable in the UK, which does not have the same high percentage of fibre optics per user as in North America and portions of Asia. While this problem is being actively addressed by British Telecom, there is a noticeable lag between the installation and implementation of an integrated solution using the high-capacity broadband communications.
This leaves the IT manager in a quandary: with the continued and projected growth of the IT network within the business community, competition for finite resources – e.g., the hardware network – becomes more than prudent; it is now imperative. Not helping the situation is the current economic climate. With the average business spending 10% of its budget to support IT operations, shaving percentage points off that amount can have a significant impact on corporate profits. While initial capital outlay may seem to be disproportionate – optimisation isn’t something readily apparent as a budget line item. However, when data flow management and systems engineering is laid out in spreadsheets and graphs, the exotic technical jargon and cryptic content is suddenly presented in a form that business managers, senior executives and upper-level corporate managers can readily understand, plan and promote to the wider organisation.
Network Optimisation starts at the individual workstation and winds its way to the server farm until it is shipped out onto the Internet or disseminated through the local area network (LAN). Tools in the form of software and hardware can go a long way to increase efficiency without compromising either security or data integrity. However, these tools on their own are of little value without organisations taking a real hard and serious look at their application estates and determining which applications could be consolidated, re-engineered (to reduce their data and network bandwidth footprints), replaced or even retired. Additionally, organisations need to scrutinise internal processes and, where necessary, update, re-design or even create new ones so that the people managing and using the network resources within the organisation are doing so more efficiently.
In the case of large corporate infrastructures, the use of a dedicated team of knowledgeable and qualified network analysts, architects and business specialists (who understand applications, infrastructure and data and can interface between the technical and the business communities) will ensure greater success in implementing network optimisation across the organisation. In any case, the end result should incorporate a usable and easy to understand graphic interface – and the appropriate throttles and regulators – to ensure load-balancing and employing the best value for the available resources. The days of simply adding more bandwidth without regard to the optimisation of data packeting and streaming are essentially gone.
The sooner the corporation takes a proactive approach to data flow management and improving the network hierarchy, the less work will be required to optimise in the future. Network Optimisation is not one of the steps that can be ignored. It is the 500-pound gorilla in the room and it isn’t going to go away by itself. An unfortunate axiom of IT is: “there is never time to do it right, but always time to do it over”.
Take the time. Analyse the problem, then implement the solutions. It is not too late – the last thing an organisation wants is the sudden realisation that the light at the end of the tunnel isn’t daylight; it’s an on-coming train.
© Copyright Imran Zaman, DAYWATCHER.COM 2009-13. All Rights Reserved.
The corporate work culture has changed a lot over the couple of years. With the growing competition in the market it has now become essential to incorporate various advanced technology for proper growth and development of the organization. Collecting valuable resources for a strong networking system plays an important role in such cases which would help in better and faster performance.
This is possible with the introduction of the forth generation wireless communication system know as the 4G network. It is a step ahead to the basic networking technology. It has the potential to provide better internet protocol system with higher security and faster data transmission thus providing higher quality service. It can also be implemented in the mobile technology which reduce the malfunctions in transmission. Mainly there are two separate type of 4G wireless network
Type of 4G Wireless Network
1. Long term evolution or LTE and
2. World wide Interoperability for Microwave Access or WiMAX
Features of 4G wireless technology
1. To enable large number of wireless- enabled devices it has 4G, IPv6 support
2. It has developed assess schemes
3. It has advanced antenna system
4. It uses SDR or software -defined Radio
5. It uses WiMax or LTE and other packet base data transmission systems
Advantages of 4G mobile technology
1. Better reception and transmission of data, at least 100 Mbit/s
2. It has secured IP based solutions such as – ultra – broadband internet access, gaming services, streamed multimedia, IP telephony etc
3. It has flexible channel bandwidth which varies from 5 – 20 MHz up to 40 MHz
4. It has smooth hand off over heterogeneous networks
5. It has femtocell which has the capacity for better coverage
The special type of antennas used in this process popularly known as Spacial multiplexing makes this technology efficient for multitasking by performing various functions simultaneously. This accelerates the data exchange rate. The global communication network used by different organization will gain stability and security by applying 4G technology in different aspects of their day to day activity. This will help them to understand the market scenario in a better way to utilize the right opportunity at the right time.
It is an exciting time in solar energy for materials scientists. Dye sensitized solar cells are narrowing the efficiency gap, carbon solar cells have become a reality and transparent solar cells are becoming practical. Despite these developments there is still significant room for third generation solar cell technology to improve. In order to understand where solar research is heading, we need to explore where it started and how it works. This article will present recent breakthroughs in transparent solar cells in their historical context and explain the basics of this promising technology.
News and Background
Since Michael Gratzel’s landmark paper on dye sensitized solar cells in 1991, transparent cells have been a promising area of photovoltaic research. This concept promises cheap, easy to install, electricity generating windows in our near future. Up until recently, the properties of such devices had remained too weak for them to be practical. Most importantly the efficiency of transparent cells could not compete with crystalline technology, which remains the king of solar. Crystalline panels have 18% average efficiency, nearly double that of thin film, its nearest competitor. This is far beyond the 1% efficiency of most transparent cells. Though transparent cells, and other third generation technologies, are not very efficient or durable, they can be flexible, easy to install and have unique physical properties. Part of the reason these cells lag behind is that they are a relatively new field of study. Fortunately, the past few years have shed light on some novel techniques that have brought transparent photovoltaics closer to the marketplace.
In 2011, a research paper from MIT by Bulovic, professor of electrical engineering, and Lunt, post doctoral researcher, presented a cell with impressive properties. The team’s organic solar cell was 1.7% efficiency and greater than 65% transparency. While this was an important result that made global news, the cell’s efficiency was still rather low and compound stability concerns still existed. These are chronic problems in organic photovoltaic cells, whose materials are less efficient than silicon and degrade quickly with use. However, the new solar cell developed at UCLA has taken significant steps to improve performance.
UCLA researchers’ latest PV publication describes a new plastic photovoltaic cell, which has an efficiency of 4% and nearly 70% transparency. These are both milestones. 70% is a record for photovoltaic transparency and, while 4% may not seem like much, keep in mind that thin film solar cells have an average of 10% efficiency. Considering the easy implementation, high efficiency and transparency of these cells, we may have photoelectric displays and windows sooner than we thought. Yang Yang, the professor who led the study, said “These results open the potential for visibly transparent polymer solar cells as add-on components of portable electronics, smart windows and building-integrated photovoltaics and in other applications.”
Transparent solar cells operate using the same mechanism as more common solar panels to produce electricity: the photovoltaic effect. Incident light on a semiconductor is converted into electricity by promoting electrons to the conduction band. These electrons then create a current as they travel between the cell’s front contact and back contact. Transparent cells differ from crystalline and thin film panels in that they absorb only non-visible light, such as infra red and ultraviolet. Most visible wavelengths, which lie between 400nm and 700nm, pass through the material unimpeded. This allows us to see through the cell. In addition, the cells are often flexible since they are not made from silicon wafers and have efficient manufacturing methods, such as rolling, that produce huge economies of scale.
Many different designs and materials are used to make transparent photovoltaic cells. Naturally, a key part of the technology is ensuring that no visible light is absorbed. Plastics, composite and a whole host of exotic materials have been used to do this. In the case of the UCLA study, a near-infrared photoactive polymer was used. The cell therefore produces most of its electricity from infrared light. This means that it is relatively reliable, producing some electricity even in dark conditions. Unfortunately the material remains somewhat unstable. The researchers were not very concerned about this, saying that some additional research could extend the cell life considerably.
Often third generation technologies, such as transparent solar cells, use titania (TiO2) nanoparticles to improve their efficiency. This material is abundant and very effective in solar cells. The UCLA cell is no exception. The cell’s conductor, which is entirely transparent, consists of a silver nanowire film doped with titania nanoparticles. Not only does the material have excellent optical properties, it is also inexpensive to produce via solution processing. Many have pointed to this conductor as a key element to the device’s success. Previous designs included opaque conductors which, quite naturally, did not make for very good transparent photovoltaic cells.
Glass is everywhere. You can find it on building’s windows, greenhouses and practically any electronic device. Transparent photovoltaic material can be used in all of these applications to produce clean, reliable electricity. A major benefit of all these potential uses is that there are no extra mounting or installation costs. For example, when new windows are needed in a building, transparent solar cells can be replace glass panels for very little extra cost. Solar glass is an easy choice for businesses as the cells, which are likely to be very cheap, will lower their electricity costs. Unlike crystalline and thin film panels, experts do not even need to be called in for installation.
The application attracting the most intense interest is portable electronic displays. Cell phone batteries are notoriously short lived. Most of our devices run out of power in under a week. By partially recharging our devices using transparent solar displays, battery life can be prolonged and electricity consumption (from the grid) reduced. Designs have already been made where the cell would reside directly on the screen, below the capacitance level, allowing for users to keep using their phones as touch screens. A company called Wisips has recently been marketing this idea. Many also believe that the cells could be successfully installed in skyscrapers and other large businesses which have a lot of windows and sunshine. 3M has their own transparent solar cell that they are planning to pitch to government and corporate buildings.
It may be a while before this technology makes it into the average households, but this will probably happen eventually. Many homes have windows that face the equator (south in the northern hemisphere, north in the southern hemisphere) and would welcome lower electricity bills. Buying a grid tie inverter for solar windows may impose an extra cost on the homeowner, but it would not be very significant. Note that if the individual already has a distributed electricity source, adding solar windows becomes even more simple.
One area that few people have discussed is using this technology in crystalline solar panel glass. Low cost and durable transparent cells could complement current solar technology by increasing the range of wavelengths of light that are absorbed. Crystalline silicon has a band gap of around 1 eV, meaning it converts light from near infrared with the greatest efficiency, but also absorbs radiation with frequencies up to that of blue visible light. The UCLA cell, which runs mainly on infrared light, may not be complementary to this technology, but a cell with a different band gap might be. By combining the two technologies, the efficiency of panels would go up, lowering the cost of solar energy.
The gaming industry is a huge multi-billion-dollar a year sector of the world economy. There are makers of gaming consoles, designers of games, retail outlets, and so many new innovations in technology happening so fast that it’s impossible to keep up with it all.
There is a lot of media coverage of the different players in the gaming industry. That’s not surprising, since there are so many devoted fans of the different consoles, and so many gaming fanatics who enjoy playing new games and updated versions of older games.
It’s real easy to start digging into the Internet sources of gaming industry news. For starters, you can search in any search engine for “gaming news” or similar search term. The trouble with that approach is that you get so many results in the list that is returned, that it’s very time-consuming to look at more than a few sites that way.
Following is a short list of five websites where you can get started digging into gaming news, perhaps with a site that suits your style or special interests.
Gametab lists the recent news articles from a wide range of gaming news websites. Categories are the different websites themselves. You can find lists of latest releases and latest news, reviews by platform, and you can participate in their forums.
N4G is a nice source of diverse news from various sources, categorized neatly so you can easily zero in on Xbox 360, PS3, Wii, or other console or platform. They also have categories for industry news, dev news, tech, and week’s hottest news.
Joystiq is a site that serves up news in the style of a blog, so it has a more relaxed and personal feel than some of the other news sites. The focus is mainly on games themselves, and the postings are categorized in a fairly usable form via a platform-specific menu.
1up covers news and gossip, and is constantly updated. The focus on mainly on gaming company related news. However, you can also find a wide range of video game reviews and previews on their site. One way to keep up with upcoming games is to check their “Launch Centers” section. And a Cheats section may be of interest to those who want to find some game shortcuts.
Gamesarefun (or GAF) is a news site that does not provide updates as often as some of the others. However, an interesting feature is a video game database. This isn’t a complete listing of all games ever made, but it sure can help you find some details on a game that you have been wondering about for awhile. GAF also has a cheats section and forums that you can browse.
Well that’s the short list. There are definitely a lot more gaming news sites out there, and they are easy to find using the method described above. So dig into these sites for your “gaming news fix” and have fun reading.
A nouse is a novel computer technology. What is unique about this technology is that it permits you as the PC user to make use of your nose and eyes as pointers. Accordingly, these parts of your body serve as hands-free taking the place of the mouse pointer that’s commonly associated with PC devices. Nouse technology comes with quite a lot of features. The most important is face and head detection. The face detection characteristic permits your pc to detect your face, as it’s what you’ll be using as the pointer. The head detection characteristic makes it possible for the PC to detect the actions and movements of your head.
Blink detection is one more characteristic of nouse technology. It’s understood that your nose can’t make obvious and deliberate movements. Accordingly, nouse technology comes with a way by which you need to use your face for purposes of making clicks. That is the use of the blinking motions of your eyes. The nouse technology system has been calibrated in such a manner that it is able to interpret say, three or 4 consecutive blinks as choices or clicks. Because it is a new technology, nouse might take a while before people can learn how to make efficient use of it.
Nouse technology also comes with a facial gestures recognition feature. That is what is used to acknowledge and detect the person’s facial gestures that can be used to perform different tasks. What is most interesting is that each of the user’s facial gestures will be accompanied by corresponding duties and commands. One other characteristic you will discover on the technology is user recognition. This characteristic will be used to acknowledge the user’s face every time the pc is in use. The importance of this specific characteristic is that it will allow your pc to not only mechanically load but in addition use distinct yet customized settings for all users.
The ultimate characteristic on nouse technology is the digital keyboard. This eliminates the necessity of a bodily keyboard. The biggest advantage of this characteristic is that it makes hands-free computing and typing possible. The characteristic can be found in the computer control and the hands-free operating system. In case you find working with a physical keyboard and mouse considerably cumbersome, it’s best to try nouse. Nevertheless, while the technology affords comfort, it doesn’t come cheap. What is more, you may not get it at your local pc retailer as it’s still comparatively new.
The nouse technology will be significantly helpful to handicapped people and people with bodily disabilities. If you already know somebody who has trouble or is unable to successfully use his/her hands because of disease or injury, you should get her or him this technology. The technology permits people to interchange pointing devices such as mouse with their very own faces. Accordingly, disabled folks will not only be capable to work but in addition talk with others. It could be right to state that when the technology becomes mainstream, bodily limitations will probably be a thing of the past.
Today technology has been used world wide to achieve the unexpected with the help of computers. Computer technology helps us in getting things done the easy way and making us feel good. What was not achievable few years back is now done with the lick of the mouse.
But technology if used as a boon can make dreams come true like the making of Avatar and can be a curse if used for destruction of humans and other living organisms. Technology can help make the world a better living space with so much to offer if used in an appropriate manner. Let the boon of technology help us achieve what we want and not do things that we might curse after it is done.
We see the world as techno savvy 25 years from now on where things no one has imagined will happen with the help of this technology and help the cause of green earth and make it a reality with this technology. So let us all come together and make sure that this technology is used not to destruct but to create marvels everyone on this earth will remember for ever and make a mark in millions of people all across the globe.
I have this vision of how the earth will be with the upcoming technologies and may this vision come true so that our children may thank us for whatever we have done for them with this technology and take it forward from there. All said and done technology is and will be our FUTURE.