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John Korb

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Limiris Mugambi

KCA University

Daniela Grejdanescu

Dr. D. P. Mishra

Bhilai Institute of Technology , Durg, Chhattisgarh

TST Tech Society Tamil

Bharathiar University, Coimbatore, Tamilnadu, INDIA

Mohammad Ashraf Hossain Sarker

Comilla University

Information Technology Institute

Modern Science and Arts (MSA) university

Kyungpook National University

Univerzitet VITEZ Travnik

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Papers by John Korb

Some Experiments with TCP/IP Protocols over an X.25 Network

This report describes some experiments to test the viabili~of highspeed (56K bps access line) X.2... more This report describes some experiments to test the viabili~of highspeed (56K bps access line) X.25 network service as a carrier for IF datagraIll.5. The conclusion, based on results with the ACCUNET service provided by AT&T, i3 that X.25 can provide a reasonable carrier, but that TCP requires careful tuning~o~ake advantage of the reliable, but long delay, service.

Fortran Interface Blocks as an Interface Description Language for Remote Procedure Calls

IFIP TC2/WG2.5 Publications, 1991

Teaching Computational Thinking to Science Majors

by John Korb and Mark Haugan

This paper describes the development and initial evaluation of a new course "Introduction to... more This paper describes the development and initial evaluation of a new course "Introduction to Computational Thinking" taken by science majors to fulflll a college computing re- quirement. The course was developed by computer science faculty in collaboration with science faculty and it focuses on the role of computing and computational principles in scientiflc inquiry. It uses Python and Python libraries

The Proposed DARPA IP-to-X.25 Interface Standard: Performance Optimization with Multiple Circuits

The Defense Advanced Research Projects Agency recently proposed guidelines for interfacing the De... more The Defense Advanced Research Projects Agency recently proposed guidelines for interfacing the Department of Defense Internet Protocol (IP) to public packet-switched networks that use the CCITT X.25 protocol. Thi9 paper briefly reviews the problem, and gives the details of an implementation that adheres to the guidelines. It describes experiments with the interface software that isolated a serious bottleneck, and shows how performance can be improved dramatically by multiplexing traffic over multiple virtual circuits. Finally, it describes a model of the underlying network that can be used to accurately predict saturation, a point at which increasing the number of virtual circuits increases the cost without increasing throughput.

Interface Structures I: Abstract Structures for Computing About Physical Objects

This is the first of two reports to define the internal interface structure for the Computing Abo... more This is the first of two reports to define the internal interface structure for the Computing About Physical Objects project. These two repons define the "operands" and "operators" at an abstract level. Later repotts will define these at the concrete and environment specific levels. The operands (or structures) 3!e described as they appear within the CAPO environment. The operators define how these structures may be created, modified and manipulated. We take the principal components of the interface structure to be geometry (geometrical objects), analysis (functions, equations and problems) and properties (simpler, unstructured information). A moderately complex example is described in detail.

The paramagnetic relaxation in structural and dynamic studies on lyotropic systems

Mammary tumor virus rna

The icon programming language

ACM SIGPLAN Notices, 1979

a 1 . Introduction

Binding software to specific native hardware in a VM environment

Proceedings of the 1st ACM workshop on Virtual machine security - VMSec '08, 2008

Page 1. Binding Software to Specific Native Hardware in a VM Environment: The PUF Challenge and O... more

Computing About Physical Objects

Computing about Physical Objects. This project has received equipment and infrastructure support ... more

The TILDE Project

by John Korb, Walter Tichy, and Tim Korb

The TILDE project investigates general-purpose computing systems that run on a multi·machine comp... more The TILDE project investigates general-purpose computing systems that run on a multi·machine computing engine. A multi-machine computing engine is a cluster of heterogeneous processors loosely coupled with a high-speed local area network. The goal of the project is to explore computing systems in which the user interlace hides details of the underlying architecture, making the distributed computing engine appear to be a single, large time-sharing system. This paper presents prqject plans and status. It describes the architecture of the TILDE computing engine as well as research in the areas of operating systems. user interfaces, and computational services. The novel computational services planned for TILDE include high-level electronic mail, a timed event service, satellite bulletin· board broadcast, supercomputer access, and otbers.

Challenges and opportunities in conducting educational research in the computer science classroom

Proceedings of the 43rd ACM technical symposium on Computer Science Education - SIGCSE '12, 2012

Abstract This workshop will provide CS educators with tools to conduct educational research. Prim... more Abstract This workshop will provide CS educators with tools to conduct educational research. Primary objectives of this workshop are:(1) learn basic principles of educational research;(2) learn about educational research designs: qualitative vs. quantitative; experimental vs. quasi-experimental; case studies, survey; and (3) to practice designing research. This workshop will help participants make informed decisions when faced with limitations of educational research and collect empirical evidence about what works in the ...

2001 NSF CISE/EIA RI and MII PI's Workshop Yearly Project Report

Introducing computational thinking in education courses

by Ninger Zhou and John Korb

Proceedings of the 42nd ACM technical symposium on Computer science education - SIGCSE '11, 2011

As computational thinking becomes a fundamental skill for the 21st century, K-12 teachers should ... more As computational thinking becomes a fundamental skill for the 21st century, K-12 teachers should be exposed to computing principles. This paper describes the implementation and evaluation of a computational thinking module in a required course for elementary and secondary education majors. We summarize the results from open-ended and multiple-choice questionnaires given both before and after the module to assess the students' attitudes toward and understanding of computational thinking. The results suggest that given relevant information about computational thinking, education students' attitudes toward computer science becomes more favorable and they will be more likely to integrate computing principles in their future teaching.

Measurement of spin-spin and spin-lattice relaxation rates for inhomogeneously broadened lines. I. Rapid spectral diffusion case

Journal of Magnetic Resonance (1969), 1980

A model involving two coupled thermodynamic reservoirs is used to describe the homogeneous satura... more A model involving two coupled thermodynamic reservoirs is used to describe the homogeneous saturation behavior of an inhomogeneous system of strongly coupled spins in interaction with a microwave field and a lattice. A semiclassical treatment in the rotating frame, in the weak-and strong-saturation limits, leads to expressions for the slow-passage dispersion, absorption, and first derivative, which can be cast into analytic forms as functions of a small number of specific parameters. This allows the determination of spin-spin and spin-lattice relaxation rates from extremum-saturation curves and unsaturated-line profiles. An algorithm is also proposed to deal with the intermediate-saturation range.

Command execution in a heterogeneous environment

ACM SIGCOMM Computer Communication Review, 1986

As a user's computing environment grows from a single time-shared host to a network of specialize... more As a user's computing environment grows from a single time-shared host to a network of specialized and general-pwpose machines, the capability for the user to access all of these resources in a consistent and transparent manner becomes desirable. Instead of viewing commands as binary files, we expect the user to view commands as services provided by servers in the network. The user interacts with a personal workstation that locates and executes services on his behaH.

CSNET protocol software

ACM SIGCOMM Computer Communication Review, 1983

CSNET is built on the Department of Defense network (ARPANET), public packet-switched physical ne... more CSNET is built on the Department of Defense network (ARPANET), public packet-switched physical networks (Telenet), and a telephone-based relay network (Phonenet). Some CSNET sites have direct connections to ARPANET, some have direct connections to Telenet, and some have connections only to telephone-based relay machines. The chief objective of CSNET is to provide a network interconnection for all groups engaged in

Generators in Icon

ACM Transactions on Programming Languages and Systems, 1981

Icon is a new programming language that includes a goal-directed expression evaluation mechanism.... more Icon is a new programming language that includes a goal-directed expression evaluation mechanism. This mechanism is based on generators--expressions that are capable of producing more than one value. If the value produced by a generator does not lead to a successful result, the generator is automatically activated for an alternate value. Generators form an integral part of Icon and can be used anywhere. In addition, they form the basis for the string scanning facility and subsume some of the control expressions found in other languages. Several examples are given.

Some Experiments with TCP/IP Protocols over an X.25 Network

This report describes some experiments to test the viabili~of highspeed (56K bps access line) X.2... more This report describes some experiments to test the viabili~of highspeed (56K bps access line) X.25 network service as a carrier for IF datagraIll.5. The conclusion, based on results with the ACCUNET service provided by AT&T, i3 that X.25 can provide a reasonable carrier, but that TCP requires careful tuning~o~ake advantage of the reliable, but long delay, service.

Fortran Interface Blocks as an Interface Description Language for Remote Procedure Calls

IFIP TC2/WG2.5 Publications, 1991

Teaching Computational Thinking to Science Majors

by John Korb and Mark Haugan

This paper describes the development and initial evaluation of a new course "Introduction to... more This paper describes the development and initial evaluation of a new course "Introduction to Computational Thinking" taken by science majors to fulflll a college computing re- quirement. The course was developed by computer science faculty in collaboration with science faculty and it focuses on the role of computing and computational principles in scientiflc inquiry. It uses Python and Python libraries

The Proposed DARPA IP-to-X.25 Interface Standard: Performance Optimization with Multiple Circuits

The Defense Advanced Research Projects Agency recently proposed guidelines for interfacing the De... more The Defense Advanced Research Projects Agency recently proposed guidelines for interfacing the Department of Defense Internet Protocol (IP) to public packet-switched networks that use the CCITT X.25 protocol. Thi9 paper briefly reviews the problem, and gives the details of an implementation that adheres to the guidelines. It describes experiments with the interface software that isolated a serious bottleneck, and shows how performance can be improved dramatically by multiplexing traffic over multiple virtual circuits. Finally, it describes a model of the underlying network that can be used to accurately predict saturation, a point at which increasing the number of virtual circuits increases the cost without increasing throughput.

Interface Structures I: Abstract Structures for Computing About Physical Objects

This is the first of two reports to define the internal interface structure for the Computing Abo... more This is the first of two reports to define the internal interface structure for the Computing About Physical Objects project. These two repons define the "operands" and "operators" at an abstract level. Later repotts will define these at the concrete and environment specific levels. The operands (or structures) 3!e described as they appear within the CAPO environment. The operators define how these structures may be created, modified and manipulated. We take the principal components of the interface structure to be geometry (geometrical objects), analysis (functions, equations and problems) and properties (simpler, unstructured information). A moderately complex example is described in detail.

The paramagnetic relaxation in structural and dynamic studies on lyotropic systems

Mammary tumor virus rna

The icon programming language

ACM SIGPLAN Notices, 1979

a 1 . Introduction

Binding software to specific native hardware in a VM environment

Proceedings of the 1st ACM workshop on Virtual machine security - VMSec '08, 2008

Page 1. Binding Software to Specific Native Hardware in a VM Environment: The PUF Challenge and O... more

Computing About Physical Objects

Computing about Physical Objects. This project has received equipment and infrastructure support ... more

The TILDE Project

by John Korb, Walter Tichy, and Tim Korb

The TILDE project investigates general-purpose computing systems that run on a multi·machine comp... more The TILDE project investigates general-purpose computing systems that run on a multi·machine computing engine. A multi-machine computing engine is a cluster of heterogeneous processors loosely coupled with a high-speed local area network. The goal of the project is to explore computing systems in which the user interlace hides details of the underlying architecture, making the distributed computing engine appear to be a single, large time-sharing system. This paper presents prqject plans and status. It describes the architecture of the TILDE computing engine as well as research in the areas of operating systems. user interfaces, and computational services. The novel computational services planned for TILDE include high-level electronic mail, a timed event service, satellite bulletin· board broadcast, supercomputer access, and otbers.

Challenges and opportunities in conducting educational research in the computer science classroom

Proceedings of the 43rd ACM technical symposium on Computer Science Education - SIGCSE '12, 2012

Abstract This workshop will provide CS educators with tools to conduct educational research. Prim... more Abstract This workshop will provide CS educators with tools to conduct educational research. Primary objectives of this workshop are:(1) learn basic principles of educational research;(2) learn about educational research designs: qualitative vs. quantitative; experimental vs. quasi-experimental; case studies, survey; and (3) to practice designing research. This workshop will help participants make informed decisions when faced with limitations of educational research and collect empirical evidence about what works in the ...

2001 NSF CISE/EIA RI and MII PI's Workshop Yearly Project Report

Introducing computational thinking in education courses

by Ninger Zhou and John Korb

Proceedings of the 42nd ACM technical symposium on Computer science education - SIGCSE '11, 2011

As computational thinking becomes a fundamental skill for the 21st century, K-12 teachers should ... more As computational thinking becomes a fundamental skill for the 21st century, K-12 teachers should be exposed to computing principles. This paper describes the implementation and evaluation of a computational thinking module in a required course for elementary and secondary education majors. We summarize the results from open-ended and multiple-choice questionnaires given both before and after the module to assess the students' attitudes toward and understanding of computational thinking. The results suggest that given relevant information about computational thinking, education students' attitudes toward computer science becomes more favorable and they will be more likely to integrate computing principles in their future teaching.

Measurement of spin-spin and spin-lattice relaxation rates for inhomogeneously broadened lines. I. Rapid spectral diffusion case

Journal of Magnetic Resonance (1969), 1980

A model involving two coupled thermodynamic reservoirs is used to describe the homogeneous satura... more A model involving two coupled thermodynamic reservoirs is used to describe the homogeneous saturation behavior of an inhomogeneous system of strongly coupled spins in interaction with a microwave field and a lattice. A semiclassical treatment in the rotating frame, in the weak-and strong-saturation limits, leads to expressions for the slow-passage dispersion, absorption, and first derivative, which can be cast into analytic forms as functions of a small number of specific parameters. This allows the determination of spin-spin and spin-lattice relaxation rates from extremum-saturation curves and unsaturated-line profiles. An algorithm is also proposed to deal with the intermediate-saturation range.

Command execution in a heterogeneous environment

ACM SIGCOMM Computer Communication Review, 1986

As a user's computing environment grows from a single time-shared host to a network of specialize... more As a user's computing environment grows from a single time-shared host to a network of specialized and general-pwpose machines, the capability for the user to access all of these resources in a consistent and transparent manner becomes desirable. Instead of viewing commands as binary files, we expect the user to view commands as services provided by servers in the network. The user interacts with a personal workstation that locates and executes services on his behaH.

CSNET protocol software

ACM SIGCOMM Computer Communication Review, 1983

CSNET is built on the Department of Defense network (ARPANET), public packet-switched physical ne... more CSNET is built on the Department of Defense network (ARPANET), public packet-switched physical networks (Telenet), and a telephone-based relay network (Phonenet). Some CSNET sites have direct connections to ARPANET, some have direct connections to Telenet, and some have connections only to telephone-based relay machines. The chief objective of CSNET is to provide a network interconnection for all groups engaged in

Generators in Icon

ACM Transactions on Programming Languages and Systems, 1981

Icon is a new programming language that includes a goal-directed expression evaluation mechanism.... more Icon is a new programming language that includes a goal-directed expression evaluation mechanism. This mechanism is based on generators--expressions that are capable of producing more than one value. If the value produced by a generator does not lead to a successful result, the generator is automatically activated for an alternate value. Generators form an integral part of Icon and can be used anywhere. In addition, they form the basis for the string scanning facility and subsume some of the control expressions found in other languages. Several examples are given.