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Medium 9781601323224

Performance of Hierarchical Polling-based MAC scheme for Wireless Body Sensor Network

Hamid R. Arabnia, Leonidas Deligiannidis, George Jandieri, Ashu M. G. Solo, Fernando G. Tinetti CSREA Press PDF

Int'l Conf. Wireless Networks | ICWN'14 |


Performance of Hierarchical Polling-based MAC scheme for Wireless Body Sensor Network

S. Motoyama

Faculty of Campo Limpo Paulista - FACCAMP

Master Program in Computer Science

Campo Limpo Paulista, S. Paulo, Brazil

Abstract - The MAC scheme called hierarchical pollingbased access scheme for Wireless Body Sensor Network

(WBSN), proposed in [24], is analyzed in this paper. The

MAC scheme, proposed in [24], is structured in hierarchy to collect data from sensor nodes inserted in human body. In first level of hierarchy the sensor nodes are divided into groups and sensor nodes of each group communicate with a sink node which collects data by using polling technique. In second level, the sink nodes communicate with a master node which collects data by also using polling technique. The performance analysis carried out in [24] considered that the sensor nodes from first level are provided with only single buffer to store data and the sink nodes have infinite size buffers. The master node used exhaustive polling technique.

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Medium 9780596527549

9.6 For More Information

James Avery O'Reilly Media PDF
Medium 9781565920002

3. Using Yacc

Doug Brown O'Reilly Media ePub

The previous chapter concentrated on lex alone. In this chapter we turn our attention to yacc, although we use lex to generate our lexical analyzers. Where lex recognizes regular expressions, yacc recognizes entire grammars. Lex divides the input stream into pieces (tokens) and then yacc takes these pieces and groups them together logically.

In this chapter we create a desk calculator, starting with simple arithmetic, then adding built-in functions, user variables, and finally user-defined functions.

Yacc takes a grammar that you specify and writes a parser that recognizes valid sentences in that grammar. We use the term sentence here in a fairly general wayfor a C language grammar the sentences are syntactically valid C programs.[8]

As we saw in Chapter 1, a grammar is a series of rules that the parser uses to recognize syntactically valid input. For example, here is a version of the grammar well use later in this chapter to build a calculator.

The vertical bar, |, means there are two possibilities for the same symbol, i.e., an expression can be either an addition or a subtraction. The symbol to the left of the is known as the left-hand side of the rule, often abbreviated LHS, and the symbols to the right are the right-hand side, usually abbreviated RHS. Several rules may have the same left-hand side; the vertical bar is just a short hand for this. Symbols that actually appear in the input and are returned by the lexer are terminal symbols or tokens, while those that appear on the left-hand side of some rule are non-terminal symbols or non-terminals. Terminal and non-terminal symbols must be different; it is an error to write a rule with a token on the left side.

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Medium 9780819883483

Station 5: The Warning of Betrayal

Julien Chilcott-Monk Pauline Books and Media ePub

“Truly, I say to you, one of you will betray me.” “Is it I, Lord?” (Matthew 26:20, 22)

“Truly, truly, I say to you, one of you will betray me.” “Lord, who is it?” (John 13:21–30)

Jesus was always conscious of discontent, and he was acutely aware of any murmurings of dissent. He knew what was in the hearts of those around him; he read Judas clearly. Of course Jesus was aware of the rumors circulating among the disciples that Judas was dipping into the common purse for his own purposes. It is likely that Jesus knew Judas might be susceptible to silver in exchange for false witness. He knew that his mission would culminate in horror; that the Heavenly Father’s will was that the Son of Man would first have to suffer in order to redeem.

We have already visited the upper room. We know how they lounge on the floor beside the low table. Leaning on their left elbows and forearms, they eat with their right hands. For moments of ritual, a more formal posture is adopted, and the men rise and sit back on their heels. Our Lord is alongside Judas Iscariot; John, whom we identify as the Beloved Disciple, is next to our Lord; and Peter lounges beside John. The confidential enquiry Peter makes of John, “Tell us, who it is of whom he speaks,” can be whispered easily and passed from John to Jesus: “Lord, who is it?” Jesus points to the traitor in a rather enigmatic way. At this stage only John knows the significance of the dipped bread. On such an occasion it would not have been an extraordinary act, but in the light of what Jesus says, this sign seems to confirm the commission Judas has already accepted. “Then … Satan entered into him.” Satan is he who obstructs, who comes between us and God as an almost impenetrable barrier; in a sense, we give him life and flesh. Satan will blind Judas as to the right course of action until it is too late. The morsel of bread is probably dipped in a confection of ground almonds and chopped apricots, a pleasant complement to the bitter herbs. He leaves the room with the words ringing in his ears: “What you are going to do, do quickly.”

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Medium 9780874254983

Gaining a DifferentPerspective

Jonamay Lambert HRD Press, Inc. PDF

Gaining a Different


15–20 minutes


To help participants realize that in a conflict situation they may have to change their position in order to see things from a different perspective.



Enough picture cards and envelopes so that when the group is divided into pairs, each pair has one card and an envelope.


1. Have the participants count off as As and Bs, and ask the As to come forward to collect envelopes with instruction slips (see Trainer’s Notes).

2. Ask each A to select a B, and pair up in a place where they can quietly talk, standing face-to-face. Give the As a few seconds to look over the instructions before they say anything to their partners, and then have them wait for a signal to begin.

3. Give the signal to begin, and then allow a minute or two for participants to follow the instructions and discuss what each person saw.

4. After participants have moved to see the other side of the card, have the group reconvene and ask the following questions:

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