AMERICAN SCIENTIST The Science of Computing 1992 - 2 ( March - April )

نویسنده

  • Peter J. Denning
چکیده

In 1960, the year of the first time-sharing systems, we crossed a divide in the history of computing. Time-sharing systems were the first to allow multiple users interactive access to their files in the same memory system. They were the first to allow users to specify who else could read and write their files. The password was invented as a means of identifying users to the system so that access specifications could be enforced.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Sustainable Design for Pervasive Computing Systems

Bio: Ravi Jain received the Ph. D in Computer Science from the University of Texas at Austin in 1992. Prior to that he worked at Syntrex Inc., SES Inc. and the Schlumberger Laboratory for Computer Science on developing communications and systems software, performance modeling, and parallel programming. Since 1992 he has been a Research Scientist and then a Senior Scientist in Applied Research, ...

متن کامل

Automatic face interpretation using fast 3D illumination-based AAM models

April 19921996 From April 1992 to December 1996, Ph.D. Student at the Technical University of Munich, Germany. Advisor: Prof. Bernd Radig. Doctoral Thesis: "Automatic Generation of Geometrical Models for Objects in 2D". March 1992 Presentation of the qualifying exams towards the Ph.D. degree in Computer Science at the Technical University of Munich Germany. Informatics Institute: March-April 19...

متن کامل

Epidemiological shift in leprosy in a rural district of central India following introduction of multi-drug therapy (April 1986 to March 1992 and April 1992 to March 2002).

This study compares the epidemiological pattern of leprosy in pre- (April 1986 to March 1992) and post- (April 1992 to March 2002) multi-drug therapy (MDT) periods by retrospective analysis of 3274 registered leprosy cases in the rural field area of Regional Leprosy Training & Research Institute (RLTRI), situated in Raipur district of Chattisgarh province of Central India. The area has high end...

متن کامل

Mapping Unstructured Grid Problems to the Connection Machine

We present a highly parallel graph mapping technique that enables one to efficiently solve unstructured grid problems on massively parallel computers. Many implicit and explicit methods for solving discretized partial differential equations require each point in the discretization to exchange data with its neighboring points every time step or iteration. The time spent communicating can limit t...

متن کامل

The influence of convective outflow on water vapor mixing ratios in the tropical upper troposphere An analysis based on UARS MLS measurements

The source of increased water vapor mixing raregions of convective outflow. These studies dealt with varitios over the central and eastern tropical Pacific region during ations in relative humidity over a broad region of the tropthe 1992 E1 Nifio event is examined using measurements of ical upper troposphere (i.e., 200-500 hPa). Presently, it is upper tropospheric water vapor provided by the Mi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1992