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Internet users routinely and often unknowingly download and run programs, such as Java applets; and some Web servers let users upload external programs and run them on the server. Although the practice of executing these external programs has the sanction of widespread use, its security implications haven’t yet been systematically addressed. In the brief,(More)
There is considerable interest in developing runtime infrastructures for programs that can migrate from one host to another. Mobile programs are appealing because they support efficient utilization of network resources and extensibility of information servers. This paper presents a scheduling scheme for allocating resources to a mix of real-time and non(More)
There is considerable interest in developing runtime infrastructures for programs that can migrate from one host to another. Mobile programs are appealing because they support efficient utilization of network resources and extensibility of information servers. In this paper, we present a scheduling scheme for allocating resources to a mix of real-time and(More)
The paper discusses a method for detection of weak signal having low signal to noise ratio (SNR). SNR can be improved using fixed filters or using a suitable adaptive filter. In practical application, the statistical characteristics of signal and noise are usually unknown. The design of fixed filter is based on priori knowledge of both the signal and noise.(More)
There is increasing interest in computing models that support extensibility of systems through code migration. Although appealing both from the system design and extensibility points of view, extensible systems are vulnerable to an external program’s aberrant execution behaviors. In this paper, we examine the problems of resource access control and resource(More)
Conventional radar altimeter systems such as Pulsed or Frequency modulated continuous wave (FM CW) have limitations on measurable range and security. In this paper, we propose a Direct sequence spread spectrum (DSSS) based radar altimeter that offers good resolution and low probability of intercept. We carried out MATLAB simulations of the system and(More)
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