Mobile satellite systems (MSSs) are expected to play a significant role in providing users with communication services worldwide. In such context, low earth orbit (LEO) satellite constellations seem to be a good solution to attain a global coverage and to allow the use of low-power lightweight mobile terminals. This paper analyzes the performance of a novel medium access control (MAC) scheme su...

In the Leo-III project, a new agent-based deduction system for classical higher-order logic is developed. Leo-III combines its predecessor’s concept of cooperating external specialist systems with a novel agent-based proof procedure. Key goals of the system’s development involve parallelism on various levels of the proof search, adaptability for different external specialists, and native suppor...

Whether a dwarf spheroidal galaxy is in equilibrium or being tidally disrupted by the Milky Way is an important question for the study of its dark matter content and distribution. This question is investigated using 328 recent observations from the dwarf spheroidal Leo I. For Leo I, tidal disruption is detected, at least for stars sufficiently far from the center, but the effect appears to be q...

The challenge of future mobile multimedia networks is to provide worldwide tetherless communication services. Low Earth Orbit-Mobile Satellite Systems (LEO-MSSs) will play a significant role by filling the coverage gaps of future generation terrestrial cellular networks. This lecture presents research results on demand-assignment Medium Access Control (MAC) schemes able to share efficiently LEO...

Future Low Earth Orbit (LEO) satellite networks are envisioned as distributed architectures of autonomous data processing nodes. Such ad hoc networks should deliver reliable communication channels for control commands and data among ground stations and satellites minimizing delay and power. The LEO satellite networks are different from the generic ad hoc scenario. In this paper, we first analyz...

As part of the reorganization of the JAIS Journal in 2002 the newly formed editorial team has decided to open the pages of the JAIS journal to the recipients of the Leo awardthe most distinguished award of AIS. The LEO Award was established in 1999 by the Council of the Association for Information Systems and the Executive Committee of the International Conference on Information Systems. Named ...

Leo Loeb [6] developed an experimental approach to studying cancer and pioneered techniques for tissue culture and in vitro [7] tissue transplantation which impacted early-to-mid twentieth century experimental embryology [8]. Loeb received his medical degree from the University of Zurich [9] in 1897. As part of his doctorate, he completed a thesis on the outcomes of tissue transplantation in gu...

In this paper, we discuss on two important issues through the realization of global personal communication networks with low earth orbital (LEO) satellites. The first issue is the selection of an effective multiple access scheme which can utilize the limited spectrum allocated to these systems. In this way, we focus on the schemes based on spread spectrum techniques and explain their unique cha...

Development of the past decade have confirmed that ATM technology has the potential of becoming the transport mechanism in many multimedia networks where high-speed traffic and Quality of Service guarantees must be provided. More recently, we have witnessed a surge of interest in Low Earth Orbiting (LEO) satellite networks with on-board ATM switches, which hold the promise of offering an econom...

Phishing website creators and anti-phishing defenders are in an arms race. Cloning a website is fairly easy and can be automated by any junior programmer. Attempting to recognize numerous phishing links posted in the wild e.g. on social media sites or in email is a constant game of escalation. Automated phishing website detection systems need both speed and accuracy to win. We present a new met...