WHAT IS GPRS
Short for General Packet Radio Service, a standard for wireless communications which runs at speeds up to 115 kilobits per second, compared with current GSM (Global System for Mobile Communications) systems' 9.6 kilobits.
GPRS, which supports a wide range of bandwidths, is an efficient use of limited bandwidth and is particularly suited for sending and receiving small bursts of data, such as e-mail and Web browsing, as well as large volumes of data.
HOW DOES GPRS WORK
Internet on the Mobile: For the first time, GPRS fully enables Mobile Internet functionality by allowing interworking between the existing Internet and the new GPRS network. Any service that is used over the fixed Internet today- File Transfer Protocol (FTP), web browsing, chat, email, telnet- will be as available over the mobile network because of GPRS.
Because it uses the same protocols, the GPRS network can be viewed as a sub-network of the Internet with GPRS capable mobile phones being viewed as mobile hosts. This means that each GPRS terminal can potentially have its own IP address and will be addressable as such.
Rich Media Applications: GPRS facilitates several new applications that have not previously been available over GSM networks due to the limitations in speed of Circuit Switched Data and message length of the Short Message Service (160 characters). GPRS will fully enable the Internet applications you are used to on your desktop from web browsing to chat over the mobile network. Other new applications for GPRS, profiled later, include file transfer and home automation- the ability to remotely access and control in-house appliances and machines.
Speed: GPRS allows large amounts of data to be sent over mobile networks at speeds three to four times greater than conventional GSM systems. Theoretical maximum speeds of up to 171.2 kilobits per second (kbps) are achievable with GPRS using all eight timeslots at the same time. This is about three to four times as fast as the data transmission speeds possible over today's fixed telecommunications networks and ten times as fast as current Circuit Switched Data services on GSM networks. By allowing information to be transmitted more quickly, immediately and efficiently across the mobile network, GPRS may well be a relatively less costly mobile data service compared to SMS and Circuit Switched Data.
Always On: GPRS facilitates instant connections whereby information can be sent or received immediately as the need arises, subject to radio coverage. No dial-up modem connection is necessary. This is why GPRS users are sometimes referred to be as being "always connected". Immediacy is one of the advantages of GPRS (and SMS) when compared to Circuit Switched Data. High immediacy is a very important feature for time critical applications such as remote credit card authorization where it would be unacceptable to keep the customer waiting for even thirty extra seconds.
Friday, March 9, 2007
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Wednesday, March 7, 2007
WEB HOSTING
WEBHOSTING SERVICE
A web hosting service is a type of Internet hosting service that allows individuals and organizations to provide their own websites accessible via the World Wide Web. Web hosts are companies that provide space on a server they own for use by their clients as well as providing Internet connectivity, typically in a data center. Webhosts can also provide data center space and connectivity to the Internet for servers they do not own to be located in their data center, called colocation.
Types of hosting
A web hosting service is a type of Internet hosting service that allows individuals and organizations to provide their own websites accessible via the World Wide Web. Web hosts are companies that provide space on a server they own for use by their clients as well as providing Internet connectivity, typically in a data center. Webhosts can also provide data center space and connectivity to the Internet for servers they do not own to be located in their data center, called colocation.
Types of hosting
Internet hosting services can run web server see internet providers
Hosting services limited to the Web:
- free web hosting service is free, (sometimes) advertisement-supported web hosting, and is extremely limited when compared to paid hosting.
- shared web hosting service: one's Web site is placed on the same server as many other sites, ranging from a few to hundreds or thousands. Typically, all domains may share a common pool of server resources, such as ram and the cpu.
- reseller web hosting: allows clients to become web hosts themselves. Resellers could function, for individual domains, under any combination of these listed types of hosting, depending on who they are affiliated with as a provider.
- virtual dedicated server: slicing up a server into virtual servers. each user feels like they're on their own dedicated server, but they're actually sharing a server with many other users.
- dedicated hosting service: the user gets his or her own Web server and gains full control over it (root access for Linux/administrator access for Windows); however, the user typically does not own the server.
- colocation web hosting service: similar to the dedicated web hosting service, but the user owns the server; the hosting company provides physical space that the server takes up and takes care of the server. This is the most powerful and expensive type of the web hosting service. In most cases, the colocation provider may provide little to no support directly for their client's machine, providing only the electrical, Internet access, and storage facilities for the server.
- clusterd hosting: having multiple servers hosting the same content for better resource utilization. Wikipedia's own servers are a good example of this.
Some specific Web services:
- file hosting service: hosts not web pages but files
- image hosting service
- video hosting service
- blog hosting service
- one-click hosting service
- shopping cart service
Saturday, February 17, 2007
HEART DISEASE
1. WHAT IS HEART DISEASE
Heart disease is any disorder that affects the heart. Sometimes the term "heart disease" is used narrowly and incorrectly as a synonym for coronary artery disease. Heart disease is synonymous with cardiac disease but not with cardiovascular disease which is any disease of the heart or blood vessels.
2.Heart disease – types of heart disease :
When you think of heart disease, usually people think of coronary artery disease (narrowing of the arteries leading to the heart), but coronary artery disease is just one type of heart disease. Among the many types of heart disease, see, for example: Angina; Arrhythmia; Congenital heart disease; Coronary artery disease (CAD); Dilated cardiomyopathy; Heart attack (myocardial infarction); Heart failure; Hypertrophic cardiomyopathy; Mitral regurgitation; Mitral valve prolapse; and Pulmonary stenosis. Heart disease is the leading cause of death for both men and women in the world. Heart disease is important to learn about your to help prevent heart disease. And, if you have cardiovascular disease, you can live a healthier, more active life by learning about your heart disease and treatments and by becoming an active participant in your care.
3.Most famous heart disease : Coronary Artery heart disease
Coronary artery disease (CAD) is atherosclerosis, or hardening, of the arteries that provide vital oxygen and nutrients to the heart.
4.Abnormal Heart Rhythms heart disease :
The heart is an amazing organ. It beats in a steady, even rhythm, about 60 to 100 times each minute (that's about 100,000 times each day!). But, sometimes your heart gets out of rhythm. An irregular or abnormal heartbeat is called an arrhythmia. An arrhythmia heart disease (also called a dysrhythmia) can involve a change in the rhythm, producing an uneven heartbeat, or a change in the rate, causing a very slow or very fast heartbeat.
5.Heart disease - Heart Failure :
The term "heart failure" can be frightening. It does not mean the heart has "failed" or stopped working. It means the heart does not pump as well as it should. Heart failure heart disease is a major health problem in the U.S., affecting nearly 5 million Americans. About 550,000 people are diagnosed with heart failure each year. Heart disease failure is the leading cause of hospitalization in people older than 65.
6.Congenital Heart Disease :
Congenital heart disease is a type of defect in one or more structures of the heart or blood vessels that occur before birth. It affects about 8 out of every 1,000 children. In this heart disease - Congenital heart defects may produce symptoms at birth, during childhood and sometimes not until adulthood. In most cases scientists don't know why they occur. Heredity may play a role as well as exposure to the fetus during pregnancy to certain viral infections, alcohol or drugs.
7.Congenital Heart Disease :
Congenital heart disease is a type of defect in one or more structures of the heart or blood vessels that occur before birth. It affects about 8 out of every 1,000 children. In this heart disease - Congenital heart defects may produce symptoms at birth, during childhood and sometimes not until adulthood. In most cases scientists don't know why they occur. Heredity may play a role as well as exposure to the fetus during pregnancy to certain viral infections, alcohol or drugs. Cardiomyopathies heart disease: Cardiomyopathies heart disease are diseases of the heart muscle itself. People with cardiomyopathies heart disease have hearts that are abnormally enlarged, thickened and/or stiffened. As a result, the heart's ability to pump blood is weakened. Without treatment, cardiomyopathies worsen over time and often lead to heart failure and abnormal heart rhythms. Aorta heart Disease and Marfan syndrome heart disease: The aorta is the large artery that leaves the heart and provides oxygen-rich blood throughout the body. Some conditions can cause the aorta to dilate (widen) or dissect (tear), increasing the risk for future life-threatening events People with aorta heart disease should be treated by an experienced team of cardiovascular specialists and surgeons. Heart disease – other important terms you should know : Heart disease - Tachycardia is an abnormally rapid beating of the heart, defined as a resting heart rate of 100 or more beats per minute in an average adult. Heart disease - heart murmur is an extra or unusual sound heard during your heartbeat. Murmurs range from very faint to very loud and sometimes sound like a whooshing or swishing noise. Normal heartbeat sounds—"lub-DUPP" or "lub-DUB"—are the valves closing as blood moves through the heart. (Go to the How the Heart Works section for more information about how a normal heart works.) Heart disease - Beta blockers are a class of drugs used for various indications, but particularly for the management of cardiac arrhythmias and cardioprotection after myocardial infarction. Heart disease - Malignant hyperthermia (MH or MHS for "malignant hyperthermia syndrome", or "malignant hyperpyrexia due to anesthesia") is a life-threatening condition resulting from a genetic sensitivity of skeletal muscles to volatile anaesthetics and depolarizing neuromuscular blocking drugs that occurs during or after anaesthesia. It is related to, but distinct from, the neuroleptic malignant syndrome. Heart disease -stent is either an expandable wire form or perforated tube (conventionally perforated by means of laser cutting) that is inserted into a natural conduit of the body to prevent or counteract a disease-induced localized flow constriction. Heart disease - Mitral valve prolapse (MVP) is a disorder that affects one of your heart's valves — the mitral valve. It occurs when the valve doesn't close correctly, allowing backward leaking of blood in your heart.
Heart disease is any disorder that affects the heart. Sometimes the term "heart disease" is used narrowly and incorrectly as a synonym for coronary artery disease. Heart disease is synonymous with cardiac disease but not with cardiovascular disease which is any disease of the heart or blood vessels.
2.Heart disease – types of heart disease :
When you think of heart disease, usually people think of coronary artery disease (narrowing of the arteries leading to the heart), but coronary artery disease is just one type of heart disease. Among the many types of heart disease, see, for example: Angina; Arrhythmia; Congenital heart disease; Coronary artery disease (CAD); Dilated cardiomyopathy; Heart attack (myocardial infarction); Heart failure; Hypertrophic cardiomyopathy; Mitral regurgitation; Mitral valve prolapse; and Pulmonary stenosis. Heart disease is the leading cause of death for both men and women in the world. Heart disease is important to learn about your to help prevent heart disease. And, if you have cardiovascular disease, you can live a healthier, more active life by learning about your heart disease and treatments and by becoming an active participant in your care.
3.Most famous heart disease : Coronary Artery heart disease
Coronary artery disease (CAD) is atherosclerosis, or hardening, of the arteries that provide vital oxygen and nutrients to the heart.
4.Abnormal Heart Rhythms heart disease :
The heart is an amazing organ. It beats in a steady, even rhythm, about 60 to 100 times each minute (that's about 100,000 times each day!). But, sometimes your heart gets out of rhythm. An irregular or abnormal heartbeat is called an arrhythmia. An arrhythmia heart disease (also called a dysrhythmia) can involve a change in the rhythm, producing an uneven heartbeat, or a change in the rate, causing a very slow or very fast heartbeat.
5.Heart disease - Heart Failure :
The term "heart failure" can be frightening. It does not mean the heart has "failed" or stopped working. It means the heart does not pump as well as it should. Heart failure heart disease is a major health problem in the U.S., affecting nearly 5 million Americans. About 550,000 people are diagnosed with heart failure each year. Heart disease failure is the leading cause of hospitalization in people older than 65.
6.Congenital Heart Disease :
Congenital heart disease is a type of defect in one or more structures of the heart or blood vessels that occur before birth. It affects about 8 out of every 1,000 children. In this heart disease - Congenital heart defects may produce symptoms at birth, during childhood and sometimes not until adulthood. In most cases scientists don't know why they occur. Heredity may play a role as well as exposure to the fetus during pregnancy to certain viral infections, alcohol or drugs.
7.Congenital Heart Disease :
Congenital heart disease is a type of defect in one or more structures of the heart or blood vessels that occur before birth. It affects about 8 out of every 1,000 children. In this heart disease - Congenital heart defects may produce symptoms at birth, during childhood and sometimes not until adulthood. In most cases scientists don't know why they occur. Heredity may play a role as well as exposure to the fetus during pregnancy to certain viral infections, alcohol or drugs. Cardiomyopathies heart disease: Cardiomyopathies heart disease are diseases of the heart muscle itself. People with cardiomyopathies heart disease have hearts that are abnormally enlarged, thickened and/or stiffened. As a result, the heart's ability to pump blood is weakened. Without treatment, cardiomyopathies worsen over time and often lead to heart failure and abnormal heart rhythms. Aorta heart Disease and Marfan syndrome heart disease: The aorta is the large artery that leaves the heart and provides oxygen-rich blood throughout the body. Some conditions can cause the aorta to dilate (widen) or dissect (tear), increasing the risk for future life-threatening events People with aorta heart disease should be treated by an experienced team of cardiovascular specialists and surgeons. Heart disease – other important terms you should know : Heart disease - Tachycardia is an abnormally rapid beating of the heart, defined as a resting heart rate of 100 or more beats per minute in an average adult. Heart disease - heart murmur is an extra or unusual sound heard during your heartbeat. Murmurs range from very faint to very loud and sometimes sound like a whooshing or swishing noise. Normal heartbeat sounds—"lub-DUPP" or "lub-DUB"—are the valves closing as blood moves through the heart. (Go to the How the Heart Works section for more information about how a normal heart works.) Heart disease - Beta blockers are a class of drugs used for various indications, but particularly for the management of cardiac arrhythmias and cardioprotection after myocardial infarction. Heart disease - Malignant hyperthermia (MH or MHS for "malignant hyperthermia syndrome", or "malignant hyperpyrexia due to anesthesia") is a life-threatening condition resulting from a genetic sensitivity of skeletal muscles to volatile anaesthetics and depolarizing neuromuscular blocking drugs that occurs during or after anaesthesia. It is related to, but distinct from, the neuroleptic malignant syndrome. Heart disease -stent is either an expandable wire form or perforated tube (conventionally perforated by means of laser cutting) that is inserted into a natural conduit of the body to prevent or counteract a disease-induced localized flow constriction. Heart disease - Mitral valve prolapse (MVP) is a disorder that affects one of your heart's valves — the mitral valve. It occurs when the valve doesn't close correctly, allowing backward leaking of blood in your heart.
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