Radonszármazékok légúti transzportjának, kiülepedésének és egészségre gyakorolt hatásának számítógépes modellezése.

Több mint száz évvel a radioaktivitás felfedezése után a sugárzások biológiai hatására vonatkozó ismereteink még mindig hiányosak. Az epidemiológia a közepes és nagy dózisok emberre gyakorolt hatásának tanulmányozásának kiváló eszköze, de a kis dózisok tartományában elveszíti hatékonyságát. A kis dózisú sugárzások hatását a leginkább biológiai kísérletekkel és modellezéssel tanulmányozhatjuk, mely módszerek egymás kiegészítői. E tanulmányban a kis dózisok problémájának a modellek felőli megközelítését mutatom be, ismertetve és értelmezve modellszámításaim idevonatkozó eredményeit

A Pragmatic Analysis of Linguistic Humor

The aim of the study is to shed light on how linguistic humor is understood. The starting point of the paper is the supposition that viewers of humorous television programs must engage in some form of quasi-pragmatic analysis of language if they are to comprehend the linguistic humor with which they are presented. Through the application of theories of language use, linguistic data from television comedies are analyzed, and possible ways of viewers’ comprehension thereof are suggested. Episodes of the television series Blackadder, Only Fools and Horses, The Big Bang Theory, and The Two Ronnies are the sources of data. The findings show the importance of context and schemata in the interpretation of meaning, and the distinction between pragmatic and semantic meaning is also highlighted as a method of comprehension. It is demonstrated that Grice’s Cooperative Principle provides an appropriate analytical framework for understanding a wide range of humorous interactions. In addition, the implications that the presence of various speech acts in comedy programs have for meaning are also touched upon

Non-linear relationship of cell hit and transformation probabilities in a low dose of inhaled radon progenies

Cellular hit probabilities of alpha particles emitted by inhaled radon progenies in sensitive bronchial epithelial cell nuclei were simulated at low exposure levels to obtain useful data for the rejection or support of the linear-non-threshold (LNT) hypothesis. In this study, local distributions of deposited inhaled radon progenies in airway bifurcation models were computed at exposure conditions characteristic of homes and uranium mines. Then, maximum local deposition enhancement factors at bronchial airway bifurcations, expressed as the ratio of local to average deposition densities, were determined to characterise the inhomogeneity of deposition and to elucidate their effect on resulting hit probabilities. The results obtained suggest that in the vicinity of the carinal regions of the central airways the probability of multiple hits can be quite high, even at low average doses. Assuming a uniform distribution of activity there are practically no multiple hits and the hit probability as a function of dose exhibits a linear shape in the low dose range. The results are quite the opposite in the case of hot spots revealed by realistic deposition calculations, where practically all cells receive multiple hits and the hit probability as a function of dose is non-linear in the average dose range of 10–100 mGy

Optimization of Wi-Fi Access Point Placement for Indoor Localization

The popularity of location based applications is undiminished today. They require accurate location information which is a challenging issue in indoor environments. Wireless technologies can help derive indoor positioning data. Especially, the Wi-Fi technology is a promising candidate due to the existing and almost ubiquitous Wi-Fi infrastructure. The already deployed Wi-Fi devices can also serve as reference points for localization eliminating the cost of setting up a dedicated system. However, the primary purpose of these Wi-Fi systems is data communication and not providing location services. Thus their positioning accuracy might be insufficient. This accuracy can be increased by carefully placing the Wi-Fi access points to cover the given territory properly. In this paper, our contribution is a method based on simulated annealing, what we propose to find the optimal number and placement of Wi-Fi access points with regard to indoor positioning. We investigate its performance in a real environment scenario via simulations

On the Placement of Wi-Fi Access Points for Indoor Localization

Nowadays, the more and more popular location based applications require accurate position information even in indoor environments. Wireless technologies can be used to derive positioning data. Especially, the Wi-Fi technology is popular for indoor localization because the existing and almost ubiquitous worldwide Wi-Fi infrastructure can be reused lowering the expenses. However, the primary purpose of these Wi-Fi systems is different from being used for positioning services, thus the accuracy they provide might be low. This accuracy can be increased by carefully placing the Wi-Fi access points to cover the given territory appropriately. In this paper, we propose a simulated annealing based method to find, in a given area, the optimal number and placement of Wi-Fi access points to be used for indoor positioning. We investigate the performance of our method via simulations