Sohail Chaudhry | Villanova University (original) (raw)

Papers by Sohail Chaudhry

Enterprise Information Systems, Apr 18, 2016

ABSTRACT To operate an in-orbit spacecraft, the spacecraft status has to be monitored autonomousl... more ABSTRACT To operate an in-orbit spacecraft, the spacecraft status has to be monitored autonomously by collecting and analysing real-time data, and then detecting abnormities and malfunctions of system components. To develop an information system for spacecraft state detection, we investigate the feasibility of using ontology-based artificial intelligence in the system development. We propose a new modelling technique based on the semantic web, agent, scenarios and ontologies model. In modelling, the subjects of astronautics fields are classified, corresponding agents and scenarios are defined, and they are connected by the semantic web to analyse data and detect failures. We introduce the modelling methodologies and the resulted framework of the status detection information system in this paper. We discuss system components as well as their interactions in details. The system has been prototyped and tested to illustrate its feasibility and effectiveness. The proposed modelling technique is generic which can be extended and applied to the system development of other large-scale and complex information systems.

Information Technology & Management, Jul 29, 2016

Technological Forecasting and Social Change, Oct 1, 2018

Negotiation Journal, 1989

Education and Computing, 1988

Decision Support Systems, 2007

International Journal of Production Research, Jun 15, 2005

Information Systems Frontiers, Apr 22, 2015

Expert Systems, Nov 1, 2010

Modern Internet routers have to handle a large number of packet classification rules, which requi... more Modern Internet routers have to handle a large number of packet classification rules, which requires classification schemes to be scalable both in time and space. In this paper, we present a scalable packet classification algorithm that is developed by combining two new concepts to the well‐known bit vector (BV) scheme. We propose a range search method based on a cache‐aware tree (CATree) which makes full use of processor's cache line to reduce the number of dynamic random access memory (DRAM) accesses. Theoretically, the number of DRAM accesses of CATree is about log(m+1) times lower than that of the widely used binary search algorithm, where m is the number of keys in a single cache line. Based on our computational results on a set of 1024 keys, the CATree algorithm is 36% faster than binary search algorithm and the performance is better when applied to a larger set of keys. In addition, we develop a rule re‐arrangement algorithm to reduce the bitmap space of BV. With this re‐arrangement, the rules for the same action may be assigned an identical priority. This reduces the number of priorities as well as the memory space of the bitmap. Furthermore, this also reduces the number of memory accesses and hence, increases the CPU cache utilization. With CATree and rule re‐arrangement, the cache‐aware bit vector with rule re‐arrangement algorithm achieves better performance in comparison with the regular BV scheme, both in space and time. In our experiments, the proposed algorithm reduces the bitmap memory space of a practical set of firewall rules by two orders of magnitude and is 91% faster than the regular BV.

Internet Research, Apr 4, 2016

International journal of purchasing and materials management, Sep 1, 1991

International Journal of Quality & Reliability Management, Aug 1, 1997

Aims to explore the role of management and control of quality in a process industry. Specifically... more Aims to explore the role of management and control of quality in a process industry. Specifically, focuses on the current practices in the process of making cheese. Develops a survey instrument to measure managers’ perceptions regarding the extent to which various quality management procedures are implemented in the production of cheese. Reveals several interesting observations: for instance, many of the managers believed that implementing more quality control procedures positively contribute towards better quality, increased productivity, and improved exporting capabilities. Moreover, employee training was viewed as a critical factor to the success of TQM initiatives in organizations. Reports other interesting results relating to the different types of tests that are commonly employed during the production of cheese and whether every plant should have a separate quality control department.

Education and Computing, 1989

ABSTRACT The article describes a systematic process which develops an expert systems course to ed... more ABSTRACT The article describes a systematic process which develops an expert systems course to educate business computer information systems professionals, with emphasis on both theoretical and applied aspects. The process includes: (1) identifying the field of practice in expert systems; (2) identifying a belief in the career of prospective business computer information systems professionals; (3) establishing an educational philosophy which emphasizes the need to promote both theoretical and applied aspects in expert systems study; (4) reinforcing some important topics which are to be stressed in the course; and (5) selecting appropriate teaching methods. An implementation of this approach in a university setting is briefly discussed.

Electronic Markets, Mar 29, 2019

Computers & Operations Research, Aug 1, 2012

One of the most important ways for promoting the service level during emergency management in pub... more One of the most important ways for promoting the service level during emergency management in public sectors is through enhancing management of strategic resources. From the perspective of vertical integration of operational process in emergency management, emergency resources can be classified as those resources used during the response period as well as those resources that are consumed during the recovery

Computers & Operations Research, May 1, 2003

ABSTRACT A hoist controlled by a computer is widely used for moving electroplates which is chemic... more ABSTRACT A hoist controlled by a computer is widely used for moving electroplates which is chemically treated in a sequence of tanks. The hoist scheduling directly affects the throughput of a production system. The objective of the hoist scheduling problem is ...

Computers & Operations Research, 1993

Journal of management analytics, Apr 3, 2015

The growing interest in the material flow (MF) theory has invoked much interesting research in re... more The growing interest in the material flow (MF) theory has invoked much interesting research in recent years. Although the MF theory is relatively new, a review of the related literature from a historical perspective shows that MF theory represents a new stage of the evolutionary development of interrelated subjects such as Physical Distribution (PD), Logistics, and Supply Chain Management (SCM). The purpose of this paper is to provide a summative review of the evolution of the subjects of PD, Logistics, and SCM, and their new development, MF theory. The paper aims at tracing how concepts and findings in PD, Logistics, SCM, and MF have been developed and have evolved. The study shows that PD evolved to Logistics in middle of the 1980s; starting from the late 1990s, Logistics has evolved to SCM; and today PD, Logistics, and SCM can be considered to be under the umbrella provided by a new theory called MF theory. This paper points out that MF theory is a necessity to deal with the overwhelming complexity of ...

Journal of management analytics, Apr 3, 2014

In this paper, a framework is developed that evaluates supermarket food safety and exposes its re... more In this paper, a framework is developed that evaluates supermarket food safety and exposes its relative strengths and weaknesses. The proposed framework is divided into three stages. During the first stage, an index system is constructed that is associated with supermarket food safety based on the supply chain. In the second stage, the Analytic Hierarchy Process (AHP) is applied to evaluate supermarket food safety. The third stage is associated with the application of the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). The proposed framework can assist managers in comprehending the present strengths and weaknesses of their food safety. Managers can identify good practices and are able to benchmark them for improving their weaknesses. This framework also facilitates the decision makers to better understand the complex relationships of the relevant supermarket food safety factors in decision-making.