containing the components of a computer central processor, complete with instruction processing unit, arithmetic, interrupt , and basic communication facilities. Such devices have been around since the early 1970s and have greatly benefitted from the continuing

devices the techniques were tailored to gate networks of the type described above. The term gate was already in use in the forties to denote the logical elements discussed earlier. There are very many good references on Boolean algebra and we may quote only a selected few of them. Suffice it to mention the texts by Hill and Peterson [1974], Kohavi [1978], and Hohn [1966]. These books give

100.1 Models Classes of Systems to Be Modeled • Two Major Approaches to Modeling • Forms of the Model • Nonuniqueness • Approximation of Continuous Systems by Discrete Models 100.2 Dynamic Response

99.1 Introduction 99.2 History 99.3 The Internet Today

98.1 Introduction 98.2 Definitions of Failure, Fault, and Error 98.3 Failure Rate and Reliability 98.4 Relationship Between Reliability and Failure Rate 98.5 Mean Time to Failure 98.6 Mean Time to Repair 98.7 Mean Time Between Failures

97.1 Computer and Communications Security Physical Security Cryptology Software Security Hardware Security Network Security Personnel Security 97.2 Fundamentals of Cryptography Central Paradigms Pseudorandomness Zero-Knowledge

96.1 Introduction 96.2 Types of Operating Systems 96.3 Distributed Computing Systems 96.4 Fault-Tolerant Systems 96.5 Parallel Processing 96.6 Real-Time Systems 96.7 Operating System Structure 96.8 Industry Standards 96.9 Conclusions

95.1 Introduction 95.2 Classifications 95.3 Types of Parallel Processors

94.1 Databases Database Abstraction • Data Models • Relational Databases • Hierarchical Databases • Network Databases • Architecture of a DBMS • Data Integrity and Security • Emerging Trends 94.2 Rule-Based Expert Systems

7.1.1在图题7.1.1所示的各电路中,哪些元件组成了级间反馈通路?它们所引入的反馈 是正反馈还是负反馈?是直流反馈还是交流反馈?(设各电路中电容的容抗对交流信号均可忽 略) 解图题7.1.1a中,由电阻R2、R1组成反馈通路,引入负反馈,交、直流反馈均有;b图中, 由Ra引入负反馈,交、直流反馈均有,由Rn、R引入直流负反馈;c图中,由R1、Ra引入负反 馈,交、直流反馈均有;d图中,由R2、R1引入负反馈,交、直流反馈均有;e图中,由A2、R3引人 负反馈,交、直流反馈均有:图中,由R。引入负反馈,交、直流反馈均有