1st:meaning:
ESMR (Enhanced Specialized Mobile Radio) is a wireless communication system in which numerous mobile/portable transceivers are linked in a network of repeaters. Each repeater has a range of approximately 5 to 10 miles. Operating frequencies are in the UHF (ultra-high-frequency) range, that is, between approximately 300 MHz and 3 GHz. Usually, the working band is near 900 MHz.
ESMR can function like its fundamentally simpler cousin, SMR, but it can also offer features similar to those of a cellular telephone network. The PTT (push-to-talk), half-duplex mode can be used; in this case the operation resembles communications between old style two-way radios. Full-duplex mode can also be used, so either party can listen and talk at the same time. Interconnection with the telephone networks is commonly done. In addition to voice communication, an ESMR system can offer paging, wireless fax, and data transmission.
ESMR systems use digital radio transmission. Spread-spectrum modes, such as frequency hopping, are common. In a well-designed ESMR system, connection is almost instantaneous, compared with the typical 15 to 20 seconds required to dial and set up a call in a public cellular network. The coverage of an ESMR system depends on the geographical distribution and needs of the users. Some systems are confined to single municipalities; others cover selected groups of metro areas; others operate over entire states or regions of a country.
Examples of ESMR networks include Ericsson's EDACS (Enhanced Digital Access Communications System), Motorola's IDEN (Integrated Dispatch Enhanced Network), and the Nextel System.
news recently:
Good news awaits coronary heart patients who cannot undergo angioplasty or bypass surgery.
The Universiti Malaya Medical Centre (UMMC) now has a therapy called the Ex-tracorporeal Shockwave Myocardial Revascula-risation (ESMR) procedure, which provides treatment without surgery.
UMMC Head of Cardiology Unit Prof Dr Wan Azman Wan Ahmad said the ESMR was a shockwave treatment directed to the heart muscle lacking in blood flow.
“The therapy will stimulate growth of new blood vessels in the heart muscle,” he told a news conference after delivery of the RM2.8mil ESMR equipment to UMMC here yesterday.
The non-invasive procedure is done by relieving blockages to the heart and allowing oxygen flow by using a special generator that produces low-intensity shockwaves.
“Each session takes about an hour, three times a week. Patients do not have to stay at UMMC. After undergoing treatment for a week, they rest for three weeks before the next treatment. Patients need to undergo treatment nine times,” said Dr Wan Azman.
He said the device would be used on patients for the first time tomorrow, and the procedure would cost RM2,500.
“The availability of the medical technology for the fist time in the country could spur research opportunities at UMMC.” — Bernama
New procedure, new hope: Dr Wan Azman explaining to Universiti Malaya vicechancellor Prof Datuk Ghauth Jasmon as PPUM faculty dean Prof Dr Datuk Ikram Shah Ismail looks on during the presentation yesterday. — BernamaN:B/2nd country yg mempunyai alat tercanggih dr jerman ini..
taken from:majalah3, the star ,others
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