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

Stock market index Stock market index is an indicator that is designed to reflect the performance of an entire market or a particular market segment. Indexes have many uses in investments: --allow us to quickly and easily assess market performance; --Serve as underlying securities for futures and options contracts;

INVESTMENTS Individhual assets and frontier portfolio So far we have learned: 1. Investor hold portfolios to reduce risk. \Non-systematic risks\ of individual assets does not matter. only \systematic risks\matter. 2. Investors hold only frontier portfolios. The natural questions to ask next are:

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

Yesterday, you interviewed two people for a job as Assistant manager in your office. Write two short letters, one to the person who got the job, and the other to the person who did not get it, telling them your decision. (Invent any details you need.)

Letter Writing Practice 2 Test Yourself You office needs to rent a video camera for one month. You need a small machine that produces a professional quality image. Write to Photofinish Ltd and ask them if they rent machines like that and the price. Write a full business letter. (invent any details you need)

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

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

Alexander graham bell an inspired black-haired scotsman of twenty eight, on the eve of marriage, vibrant and alive to new ideas Alexander Graham bell. The Man who invented the Telephone A| xander graham be‖l 1847to1922