A Model of CAD Transactions
نویسندگان
چکیده
A CAD environment requires a significantly different model of transaction from that developed for typical data-processing applications. A viable model of CAD transaction must allow a group of cooperating designers to arrive at a design without being forced to wait over a long duration. It must also allow a group of designers to collaborate on a design with another group by assigning subtasks. In this paper, we provide both an intuitive description and a formal development of a new model of CAD transactions. collection of private systems connected to the public system [HASK82, KATZ84, LORI83, KlM84]. The public system manages the public database of stable design data and design control data. A private system manages the private database of a designer on a design workstation. A CAD transaction, initiated on a private system, consists of
منابع مشابه
Concurrency Control and Object-Oriented Databases
2 Transaction Approach 47 2.1 A Design Task Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 2.2 Compatibility Set Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 2.3 Constraint-Based Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 2.3.1 Intuitive Model of CAD Transaction . . . . . . . . . . . . . . . . . . . ...
متن کاملCompact CAD Models for the Signal Integrity Verification of Multi-Coupled Transmission Lines
A novel modal signal decoupling algorithm for multicoupled transmission lines is developed. Since the proposed method exploits a set of basis vectors associated with the characteristic impedances of the transmission line system, these multi-coupled signals can be efficiently decoupled regardless of dielectric media and conductors. Thus, compact forms of the signal integrity verification CAD mod...
متن کاملبررسی ارتباط پلی مورفیسمهای شایع ژن گیرنده ویتامین D با خطر ابتلا به بیماری عروق کرونر قلب: شواهد حاصل از یک مطالعه متاآنالیز با 5259 مورد بیمار
Background:Previous studies evaluating the association between ApaI, FokI, TaqI, and BsmI polymorphisms of vitamin D receptor gene (VDR) and risk of coronary artery disease (CAD) have produced inconsistent results. The present meta-analysis of eligible studies was conducted to reveal whether this polymorphism plays a role in susceptibility to CAD. Methods: Literature search...
متن کاملBusiness Ethics as a Prevention Paradigm of Banking Crimes
Background: One of the prominent features of ethics is to prevent conflict and tension in society and between individuals, and when ethics exist in society, some abnormalities in society will be eliminated. Ethics are also important in business relationships and will promote business prosperity, trust, honesty and goodwill, and economic transactions will result in a healthy and reassuring envir...
متن کاملAssociation of -77T>C and Arg194trp polymorphisms of XRCC1 with risk of coronary artery diseases in Iranian population
Objective(s): Coronary artery disease (CAD) is the leading cause of death in both male and female worldwide. The main cause of CAD is the atherosclerosis of coronary arteries, which is, mostly caused by genetic alteration. 50% of such cases occur in mitotic cells where single-strand breaks occur spontaneously or due to ionizing radiation. X-ray repair cross-complementing protein 1 (XRCC1) as a ...
متن کامل