An Adaptive Block-Based Eigenvector Equalization for Time-Varying Multipath Fading Channels

In this paper we present an adaptive Block-Based EigenVector Algorithm (BBEVA) for blind equalization of time-varying multipath fading channels. In addition we assess the performance of the new algorithm for different configurations and compare the results with the least mean squares (LMS) algorithm. The new algorithm is evaluated in terms of intersymbol interference (ISI) suppression, mean squared error (MSE) and by examining the signal constellation at the output of the equalizer. Simulation results show that the BBEVA performs better than the non-blind LMS algorithm

An Efficient and Effective Pilot Space-Time Adaptive Algorithm for Mobile Communication Systems

In this paper we present a new adaptive space-time algorithm for mitigating the effects of CCI and ISI and minimizing the probability of error in mobile communication systems, and evaluate its performance for different mobile velocities. The proposed algorithm is computationally efficient and provides better performance than the conventional RLS algorithm

The use of the psychiatric history interview: a study made at the Rhode Island State Hospital

Thesis (M.S.)--Boston University, 1947. This item was digitized by the Internet Archive

The Collatz Conjecture and Integers of the Form \u3cem\u3e2\u3csup\u3ek\u3c/sup\u3eb−m\u3c/em\u3e and \u3cem\u3e3\u3csup\u3ek\u3c/sup\u3eb−1\u3c/em\u3e

One of the more well-known unsolved problems in number theory is the Collatz (3n + 1) Conjecture. The conjecture states that iterating the map that takes even n ∈ N to n/2 and odd n to (3n+1)/2 will eventually yield 1. This paper is an exploration of this conjecture on positive integers of the form 2kb−m and 3kb−1, and stems from the work of the first author\u27s Senior Seminar research. We take an elementary approach to prove interesting relationships and patterns in the number of iterations, called the total stopping time, required for integers of the aforementioned forms to reach 1, so that our results and proofs would be accessible to an undergraduate. Our results, then, provide a degree of insight into the Collatz Conjecture

Determining Biases in the Card-Chameleon Cryptosystem

Throughout history, spies, soldiers, and others have relied on so-called {\em hand ciphers} to send encrypted messages. Since the creation of Pontifex (also known as Solitaire) by Bruce Schneier in 1999, a number of hand ciphers utilizing a standard deck of playing cards have emerged. Since there are $52! \approx 2^{225.58}$ possible ways to order a deck of cards, there are over 225 bits of entropy in a well-shuffled deck of cards. Theoretically, this can provide enough security to rival modern computer-based cryptosystems. In this paper, we describe and analyze one such playing card cipher, Card-Chameleon, created by Matthew McKague. Our analysis reveals new weaknesses in this cryptosystem, particularly the tendency for a letter to encrypt to itself. This bias makes it easy to recover the plaintext if it is encrypted into multiple different ciphertexts. We will describe variations of Card-Chameleon which significantly reduced these weaknesses but did not completely eliminate them

DET FINNS INGA TVÅ LIKADANA: En antropologisk studie av autism och identitet

Detta är en studie av fyra olika individer som har fått en autismspektrumdiagnos. Autism är en utvecklingsrelaterad funktionsnedsättning som visar sig i hur en person uppfattar omvärlden och samspelar och kommunicerar med andra. Det finns stora skillnader mellan personer med autism, både vad gäller hur diagnosen visar sig och andra personliga egenskaper. Autism brukar därför beskrivas som ett spektrum, med många olika nyanser. Då allt fler får en autismspektrumdiagnos blir kunskapen kring autism och personer med autism allt viktigare. Denna studies syfte är därför att undersöka hur deltagarna uppfattar sig själva, sin diagnos och sin plats i samhället. Studien utgår från de teoretiska begreppen identitet, agens och stigma och argumenterar att det finns stor kunskapsbrist gällande autism i samhället. Studien visar att personer med autism är separata individer med personliga upplevelser och uppfattningar. Studiens deltagare har dock liknande upplevelser av förminskande och stigmatiserat bemötande. Studien visar även att en diagnos både kan vara bekräftande och begränsande för individens självbild och agensutövande. Studien baseras på sex semistrukturerade intervjuer med fyra personer som fått en autismspektrumdiagnos. Studien är skriven på svenska

VRAKA—A Probabilistic Risk Assessment Method for Potentially Polluting Shipwrecks

Shipwrecks around the world contain unknown volumes of hazardous substances which, if discharged, could harm the marine environment. Shipwrecks can deteriorate for a number of reasons, including corrosion and physical impact from trawling and other activities, and the probability of a leakage increases with time. Before deciding on possible mitigation measures, there are currently few comprehensive methods for assessing shipwrecks with respect to pollution risks. A holistic method for estimating environmental risks from shipwrecks should be based on well-established risk assessment methods and should take into account both the probability of discharge and the potential consequences. The purpose of this study was therefore to present a holistic risk assessment method for potentially polluting shipwrecks. The focus is set to developing a method for estimating the environmental consequences of potential discharges of hazardous substances from shipwrecks and to combine this with earlier research on a tool for estimating the probability of discharge of hazardous substances. Risk evaluation should also be included in a full risk assessment and is the subject of further research. The consequence assessment was developed for application in three tiers. In Tier 1, the probability of discharge and possible amount of discharge are compared to other shipwrecks. In Tier 2, a risk matrix, including a classification of potential consequences, is suggested as a basis for assessment and comparison. The most detailed level, Tier 3, is based on advanced tools for oil spill trajectory modeling and sensitivity mapping of the Swedish coast. To illustrate the method an example application on two wrecks is presented. Wreck number 1 present a lower probability of discharge and a lower consequence in a Tier 1 and Tier 3 assessment. For the Tier 2 consequence assessment, the two example wrecks present equal consequence. The tool for estimating the probability of discharge of hazardous substances from shipwrecks, and the approach for consequence estimation, offers a comprehensive method for assessing the risks presented by potentially polluting shipwrecks. The method is known as VRAKA (short for shipwreck risk assessment in Swedish) and provides decision support, facilitating prioritization of risk mitigation measures enabling efficient use of available resources