arXiv subjects

Reginald D. Smith

Publications and source records attributed to Reginald D. Smith.

29 records · Page 2Linked to original sources

arXiv2010

Broadcasting but not receiving: density dependence considerations for SETI signals

This paper develops a detailed quantitative model which uses the Drake equation and an assumption of an average maximum radio broadcasting distance by an communicative civilization to derive a minimum civilization density for contact between two civilizations to be probable in a given volume of space under certain conditions, the amount of time it would take for a first contact, and whether reciprocal contact is possible. Results show that under certain assumptions, a galaxy can be teeming with civilizations yet not have a guarantee of communication between any of them given either short lifetimes or small maximum distances for communication.

physics.gen-ph↗

arXiv2009

The Spread of the Credit Crisis: View from a Stock Correlation Network

The credit crisis roiling the world's financial markets will likely take years and entire careers to fully understand and analyze. A short empirical investigation of the current trends, however, demonstrates that the losses in certain markets, in this case the US equity markets, follow a cascade or epidemic flow like model along the correlations of various stocks. This phenomenon will be shown by the graphical display of stock returns across the network as well as the dependence of stock returns on topological measures. Finally, whether the idea of "epidemic" or a "cascade" is a metaphor or model for this crisis will be discussed.

q-fin.ST↗

arXiv2009

Internet Traffic Periodicities and Oscillations: A Brief Review

Internet traffic displays many persistent periodicities (oscillations) on a large range of time scales. This paper describes the measurement methodology to detect Internet traffic periodicities and also describes the main periodicities in Internet traffic.

cs.NI↗

arXiv2009

Constructing word similarities in Meroitic as an aid to decipherment

Meroitic is the still undeciphered language of the ancient civilization of Kush. Over the years, various techniques for decipherment such as finding a bilingual text or cognates from modern or other ancient languages in the Sudan and surrounding areas has not been successful. Using techniques borrowed from information theory and natural language statistics, similar words are paired and attempts are made to use currently defined words to extract at least partial meaning from unknown words.

cs.CL↗

arXiv2009

Phase Diagrams of Network Traffic

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

cs.NI↗

arXiv2009

Plant-Mycorrhiza Percent Infection as Evidence of Coupled Metabolism

A common feature of mycorrhizal observation is the growth of the infection on the plant root as a percent of the infected root or root tip length. Often, this is measured as a logistic curve with an eventual, though usually transient, plateau. It is shown in this paper that the periods of stable percent infection in the mycorrhizal growth cycle correspond to periods where both the plant and mycorrhiza growth rates and likely metabolism are tightly coupled.

q-bio.PE↗

arXiv2009

Data Traffic Dynamics and Saturation on a Single Link

The dynamics of User Datagram Protocol (UDP) traffic over Ethernet between two computers are analyzed using nonlinear dynamics which shows that there are two clear regimes in the data flow: free flow and saturated. The two most important variables affecting this are the packet size and packet flow rate. However, this transition is due to a transcritical bifurcation rather than phase transition in models such as in vehicle traffic or theorized large-scale computer network congestion. It is hoped this model will help lay the groundwork for further research on the dynamics of networks, especially computer networks.

cs.NI↗

arXiv2008

Investigation of the Zipf-plot of the extinct Meroitic language

The ancient and extinct language Meroitic is investigated using Zipf's Law. In particular, since Meroitic is still undeciphered, the Zipf law analysis allows us to assess the quality of current texts and possible avenues for future investigation using statistical techniques.

cs.CL↗

arXiv2008

Average Path Length in Complex Networks: Patterns and Predictions

A simple and accurate relationship is demonstrated that links the average shortest path, nodes, and edges in a complex network. This relationship takes advantage of the concept of link density and shows a large improvement in fitting networks of all scales over the typical random graph model. The relationships herein can allow researchers to better predict the shortest path of networks of almost any size.

physics.soc-ph↗

arXiv2006

The Network of Collaboration Among Rappers and its Community Structure

The social network formed by the collaboration between rappers is studied using standard statistical techniques for analyzing complex networks. In addition, the community structure of the rap music community is analyzed using a new method that uses weighted edges to determine which connections are most important and revealing among all the communities. The results of this method as well as possible reasons for the structure of the rap music community are discussed.

physics.soc-ph↗

arXiv2002

Instant Messaging as a Scale-Free Network

The topology of an instant messaging system is described. Statistical measures of the network are given and compared with the statistics of a comparable random graph. The scale-free character of the network is examined and implications are given for the structure of social networks and instant messenger security.

cond-mat.stat-mech↗