Directions: Choose the best answer to complete each of the questions or statements after each passage Passage one We have found our way to the old. and some of us have discovered that they often save the young

Directions: Choose the best answer to complete each of the following sentences 1.The assignment for Thursday is to write composition about your hometown A)a five-hundred-words B)a five-hundred-word C)a five-hundreds-word D)a five-hundreds-words

Lecture 2 Differential geometry of curves 2.1 Definition of curves 2.1.1 Plane curves Implicit curves f(, y)=0 Example:x2+y2=a2 It is difficult to trace implicit curves It is easy to check if a point lies on the curve Multi-valued and closed curves can be represented

How to Teach Internal Medicine 2005.2-7: Lecture_(Bilingual teaching) 2005.9-2006.1 Bedside teaching: rotation for weeks, including Respiratory system, Cardiovascular system, Gastrointestinal system, Kidney and urinary system, Endocrinology, Hematology, etc

They account for 50% of consultations with general practitioners for acute illness in young children and one-third of consultations in older children Respiratory illness leads to 20-35% of acute paediatric admissions to hospital They are the fifth most common cause of death in children ages between one and 14 years in the UK

History and development of Endocrinology(1) Roughly a hundred years ago, Starling coined the term hormone to describe secretin, a substance secreted by the small intestine into the blood stream to stimulate pancreatic secretion. In his Croonian Lectures, Starling considered the endo- crine and nervous systems as two distinct mechanisms for coordination and control of organ function. Thus, endocrinology found its first home in the discipline of mammalian physiology

Introduction Frequency-selective fading is a dominant impairment in mobile communications Fading reduces receive signal-to-noise ratio and degrades the bit-error-rate(BER) Frequency selectivity of the channel, i. e, delay spread, induces inter-symbol interference(ISI) To combat frequency-selective fading

Multiple Access shared transmission medium a receiver can hear multiple transmitters a transmitter can be heard by multiple receivers the major problem with multi-access is allocating the channel between the users the nodes do not know when the other nodes have data to send Need to coordinate transmissions

Be aware of what is selling and buying Be aware of the sales process Know how to negotiate on the phone Know how to negotiate an international deal

Carrier Sense Multiple Access(CSMA) In certain situations nodes can hear each other by listening to the channel “Carrier Sensing CSMA: Polite version of Aloha Nodes listen to the channel before they start transmission Channel idle=> Transmit Channel busy = Wait (join backlog) When do backlogged nodes transmit? When channel becomes idle backlogged nodes attempt transmission with probability q=1 Persistent protocol, q=1 Non-persistent protocol,< 1