Stephen Hayne | Colorado State University (original) (raw)

Papers by Stephen Hayne

This paper explores the effects of knowledge homogeneity (shared or common) and knowledge heterog... more This paper explores the effects of knowledge homogeneity (shared or common) and knowledge heterogeneity (distributed) on team outcomes and processes. An experiment was conducted in which teams made resource allocation decisions while physically dispersed and supported with a shared virtual work surface and chat. The task required teams to learn and recognize patterns and then collaborate to allocate their resources appropriately. Dependent measures included process (chat, movement, conflict), and outcome quality. All teams received significant financial rewards in direct proportion to their performance. Teams with common knowledge significantly outperformed teams with distributed knowledge. Heterogeneous teams appeared to use the leader/follower paradigm.

Proceedings of the 53rd Hawaii International Conference on System Sciences, 2020

We present an approach for Distributed Denial of Service (DDoS) attack detection and mitigation i... more We present an approach for Distributed Denial of Service (DDoS) attack detection and mitigation in near-real time. The adaptive unsupervised machine learning methodology is based on volumetric thresholding, Functional Principal Component Analysis, and K-means clustering (with tuning parameters for flexibility), which dissects the dataset into categories of outlier source IP addresses. A probabilistic risk assessment technique is used to assign "threat levels" to potential malicious actors. We use our approach to analyze a synthetic DDoS attack with ground truth, as well as the Network Time Protocol (NTP) amplification attack that occurred during January of 2014 at a large mountain-range university. We demonstrate the speed and capabilities of our technique through replay of the NTP attack. We show that we can detect and attenuate the DDoS within two minutes with significantly reduced volume throughout the six waves of the attack.

Proceedings of the 52nd Hawaii International Conference on System Sciences, 2019

Adversaries are always probing for vulnerable spots on the Internet so they can attack their targ... more Adversaries are always probing for vulnerable spots on the Internet so they can attack their target. By examining traffic at the firewall, we can look for anomalies that may represent these probes. To help select the right techniques we conduct comparisons of supervised and unsupervised machine learning on network flows to find sets of outliers flagged as potential threats. We apply Functional PCA and K-Means together versus Multilayer Perceptron on a real-world dataset of traffic prior to an NTP DDoS attack in January 2014; scanning activity was heightened during this pre-attack period. We partition data to evaluate detection powers of each technique and show that FPCA+Kmeans outperforms MLP. We also present a new variation of the circle plot for visualization of resulting outliers which we suggest excels at displaying multidimensional attributes of an individual IP's behavior over time. In small multiples, circle plots show a gestalt overview of traffic.

Decision Sciences, 2015

Reputation systems based on buyer feedback play an important role in today's online markets. ... more Reputation systems based on buyer feedback play an important role in today's online markets. In this article, we provide a rigorous methodology to establish a relationship between a seller's feedback history and risk of default. We validate this method against eBay's reputation system, using a dataset of terminated users (Not-A-Registered-User or NARU) and the feedback left for them by buyers. By treating feedback rating data as a function of time, we characterize the tendency of change in seller feedback ratings in order to predict the behavior of a seller. We find that NARU sellers have significantly more negative feedback in their final weeks. Applying functional principal component analysis and classification tree methods, we find that when projecting the feedback data to an appropriate space, NARU and non-NARU sellers can be distinguished at better than 92% accuracy. We use this to provide a quantitative mechanism for evaluating the risk of trading with a seller who has less than perfect feedback, and offer advice on how much a buyer should offer to pay, given an asking price on a commodity item and a seller's feedback history

Computers & Education, Jan 31, 2005

While the telepointer has been widely accepted in the Computer Supported Collaborative Work commu... more While the telepointer has been widely accepted in the Computer Supported Collaborative Work community, little work has been done to quantify its effect on performance and perception. We present preliminary results quantifying the telepointer's effect on knowledge retention and satisfaction in an online collaboration. In experiments, a remote expert communicated with small student groups to explain an online scanning probe microscope (SPM) interface. The expert used two-way audio–video plus a telepointer to describe the ...

International Conference on Information Systems, 1989

This paper presents an approach for integrating different types of information systems technologi... more This paper presents an approach for integrating different types of information systems technologies to support the functions of an Information Center (IC). A knowledge based system, Information Center Expert/Help Service (ICE/H), has been developed to provide support for the help services of an IC. A general process model to represent the consultation process in an IC is described. Based on this model, an architecture to support the consultation process has been developed. The architecture depicts the use of a knowledge management system, a data management system and a communication (E-mail) system to emulate the consultation process. The ICE/H system has been implemented using this architecture to support an IC with 5000 users.

Data Engineering, 1990. Proceedings. Sixth …, Feb 5, 1990

A description is given of the architecture and development of a knowledge-based system called MUV... more A description is given of the architecture and development of a knowledge-based system called MUVIS (multiuser view integration system) to support the design of distributed object-oriented databases. MUVIS is implemented using an object-oriented development environment. It assists database designers in representing user views and integrating these views into a global conceptual view. The view integration component is decoupled from the view modeling component. The underlying data model, the semantic data model, treats all ...

Professional Communication, IEEE Transactions on, Jun 1, 2008

This article provides an introduction to the Special Section on Darwinian Perspectives on Electro... more This article provides an introduction to the Special Section on Darwinian Perspectives on Electronic Communication. It starts with a discussion of the motivation for the Special Section, followed by several sections written by the Guest Editor (Ned Kock) and the Guest Associate Editors (Donald Hantula, Stephen Hayne, Gad Saad, Peter Todd, and Richard Watson). In those sections, the Guest Editor and Associate Editors put forth several provocative ideas that hopefully will provide a roadmap for future inquiry in areas related ...

System Sciences, 1993, …, Jan 5, 1993

The authors discuss the issues underlying the concept of gesturing. Specifically, they explore ge... more The authors discuss the issues underlying the concept of gesturing. Specifically, they explore gesturing as applied to users of group support systems. The definition of gesturing is extended beyond simple telepointers to include: the use of motion as a means of expression; and movement that expresses or emphasizes an idea, a sentiment or attitude. The authors address such issues as at what level of interactions should gesturing be supported, how large and what shape should gesture pointers be, how should they move, ...

A national survey of small Canadian firms was conducted using the Delphi technique. Major informa... more A national survey of small Canadian firms was conducted using the Delphi technique. Major information systems issues were identified including 1) using IS for competitive advantage; 2) improving IS project management practices and 3) improving the effectiveness of software development. It appears that small firms are lagging large firms where the technology is concerned, but are similar on conceptual issues.

Ibm Systems Journal, 1995

Abstract: The changing face of business practices in the current corporate accounting environment... more Abstract: The changing face of business practices in the current corporate accounting environment opens up a wide array of questions regarding the impacts of this new environment on decision making processes. Three of the primary changes that have radically changed organizational decision making are (1) an emphasis on work groups and management teams,(2) rightsizing and business process re-engineering efforts that have placed increased pressure on managers to increase their own productivity, and (3) an ...

Proceedings of the 1992 Acm Conference on Computer Supported Cooperative Work, Dec 1, 1992

ABSTRACT Group facilitation is a dynamic process that involves managing relationships between peo... more ABSTRACT Group facilitation is a dynamic process that involves managing relationships between people, tasks and technology, as well as structuring tasks and contributing to the effective accomplishment of the meetings outcomes. This is a difficult problem that becomes even more difficult as group work is geographically distributed. This paper provides a comprehensive framework, in the form of a meeting model, that defines the many activities that surround group work. We show that in existing systems support for facilitation is low ...

Proceedings of the 1994 Conference of the Centre For Advanced Studies on Collaborative Research, 1994

ACM SIGGROUP Bulletin, 1998

ABSTRACT

Economics has focused on models of individual rational agents. But many important decisions are m... more Economics has focused on models of individual rational agents. But many important decisions are made by small groups such as families, management teams, boards of directors, central bank boards, juries, appellate courts, and committees of various types. For example, bid amounts in common value auctions such as the Outer Continental Shelf oil lease auction are typically decided by committees. Previous experimental research with natural groups has found that group bidders are significantly less rational than individual bidders in how they use information in common value auctions. Experiments reported here involve cooperative and non-cooperative nominal groups. The unequal profit-sharing rule with non-cooperative nominal groups creates an incentive to free ride within the bidding groups. This incentive to free ride tends to offset the winner's curse and promote rational bidding.

IntroductiontoDarwinianPerspectivesonElectronicCommunication........................................ more IntroductiontoDarwinianPerspectivesonElectronicCommunication................................................. ....... ............................................... N. Kock, DA Hantula, SC Hayne, G. Saad, PM Todd, and RT Watson ... SPECIAL SECTION PAPERS Online Shopping as Foraging: The Effects of Increasing Delays on Purchasing and Patch Residence ...................... ............................................................................. . DA Hantula, DD Brockman, and CL Smith ... Online Hunting and Gathering: An Evolutionary Perspective on Sex Differences in Website Preferences and Navigation . . ............................. ...