CONTENTS THE OSI MODEL LAYERS IN THE OSI MODEL TCPIP PROTOCOL SUITE ADDRESSING Tcp/IP VERSIONS CSIE, NTUT, TAIWAN

Multiple Threads Master thread for connection requests Slave threads for handling communication with clients Thread of execution: an abstraction of independent computation Single process can contain one or more threads CSIE, NTUT, Taiwan

Conceptual Server Algorithm Simple Server Algorithm Create a socket Bind the socket to the port Enter an infinite loop Accept request Process request Reply request Not enough in practice generally

Introduction Single thread for multiple transport protocols Motivation Server design and process structure An iterative example Concurrent multiprotocol servers

Introduction Loosely specified protocol software interface Interface functionality Conceptual interface specification · System calls Two basic approaches to network communication Basic I/ functions in Linux

CONTENTS TCP SERVICES NUMBERING BYTES FLOW CONTROL SILLY WINDOW SYNDROME ERROR CONTROL TCP TIMERS CONGESTION CONTROL SEGMENT OPTIONS CHECKSUM

CONTENTS BRIEF HISTORY PROTOCOLS AND STANDARDS STANDARDS ORGANIZATIONS INTERNET STANDARDS INTERNET ADMINISTRATION CSIE, NTUT, TAIWAN

同质结:由同种半导体材料构成的N区或P区,形成的PN结。如将两块带隙宽度相同、掺杂不 同的半导体材料,在一定的条件下生长在一起形成同质结。 异质结:两种带隙宽度不同的半导体材料生长在同一块单晶上形成的结。 同型异质结:结的两边导电类型相同:NN,PP结 异型异质结:结的两边导电类型不相同:NP,PN结 对于异型异质结:两种材料的带隙不同

如果曲面由方程z=z(x,y)给出,则有 Dxy 简要证明: 已知(△S)=(△),其中当cosy>0(C取上侧)时取正号, 当cosy0(取下侧)时取负号 又当(,np)是上的一点时,有5=(5,n)因此有

第一章 1.1证明:1°由数学期望的定义,且X是非负随机变量,有:E(N)=nonp(n=n=1P(nn),令m=n-1,有:E(N)=np(nn)=mpnm+1)=2m=p(n>m)=n-p(n>n)2°先证明一般情况。由数学期望的定义,且X是非负随机变量,有:E(Xn)=)= Jntn-I- dt dF)