The Law and the Human Target in Information Warfare: Cautions and Opportunities

This bachelor thesis will explore how two traffic shaping mechanisms can help preserve battery power while retaining a certain Quality of Service (QoS) in an Android based application developed for crisis management. The implemented user-space mechanisms will delay all elastic data requests in order to reduce the number of times the 3G transmission radio enters high power states. This lowers the QoS but extends the user equipment's battery life. The thesis will show that a shaping mechanism has the capability to reduce radio energy usage by up to 50% for the given Android application at the cost of added transmission delays by up to 134 seconds for background traffic. The study also presents two policies that help the application adapt to the current battery level and lower the QoS accordingly, namely one that has a lenient savings effect and one that has an aggressive savings effect

Determinants of agricultural protection from an international perspective: The role of political institutions

"This paper explores the role of political institutions in determining the ability of agriculture to avoid taxation in developing countries or attract government transfers in industrialized countries. The utilized model is based on a probabilistic voting environment, wherein rural districts are less ideologically committed than urban districts in industrialized countries, and the reverse is true in developing countries. As a consequence, in industrialized (developing) countries rural (urban) districts are pivotal in determining the coalition that obtains a majority, whereas urban (rural) districts are pivotal within the majority itself. In bargaining at the level of the legislature, this generates a conflict between a government that tends to favor rural (urban) districts, and a parliamentary majority that is dominated by urban (rural) concerns. As district size grows and the electoral system converges to a purely proportional system, both of these biases are attenuated. Overall, we see opposing nonlinear relationships between district size and agricultural subsidies on the one hand and district size and taxation on the other. In developing countries, taxation of agriculture first increases and then decreases with district magnitude; in industrialized countries, agricultural subsidization first increases and then decreases with district magnitude. Moreover, the impact of district magnitude on the level of agricultural subsidization is attenuated in presidential versus parliamentary systems, while the level of agricultural taxation is amplified in presidential systems. In the present paper, these findings are first theorized and then empirically confirmed by a cross-country analysis of data from 37 countries over a 20-year period." from authors' abstractpolitical economy of agricultural protectionism, Agricultural policies, Urban-rural differences, political institutions,

Determinants of Agricultural Protection in an International Perspective: The Role of Political Institutions

Abstract—This paper studies the role of political institutions in determining the political success of agriculture in avoiding taxation or attracting government transfers in developing and industrialized countries, respectively. The model is based on a probabilistic voting environment, where in industrialized countries rural districts are less ideologically committed than urban districts, while in developing countries urban districts are less ideologically committed than rural districts. As a consequence, in industrialized (developing) countries rural (urban) districts are pivotal in determining the coalition that obtains a majority, whereas urban (rural) districts are pivotal within the majority itself. In bargaining at the legislature, this generates a conflict between the government, who will tend to favor rural (urban) districts, and its parliamentary majority, that will be dominated by urban (rural) concerns. As district size grows and the electoral system converges to a pure proportional system, both of these biases are attenuated. Overall, an opposite nonlinear relationship between district size and agricultural subsidies on the one hand and district size and taxation on the other hand follows, i.e. in developing countries taxation of agriculture first increases and then decreases with district magnitude, while in industrialized countries agricultural subsidization first increases and then decreases with district magnitude. Moreover, the impact of district magnitude on the level of agricultural subsidization is attenuated in presidential when compared to parliamentary systems, while the level of agricultural taxation is amplified in presidential systems. Empirical results from cross-country analysis including 37 countries over 20 years mainly support our theory.Political Institutions, Agricultural Protection, Probabilistic Voting Model, International Relations/Trade,

Enumerations of Permutations Simultaneously Avoiding a Vincular and a Covincular Pattern of Length 3

Vincular and covincular patterns are generalizations of classical patterns allowing restrictions on the indices and values of the occurrences in a permutation. In this paper we study the integer sequences arising as the enumerations of permutations simultaneously avoiding a vincular and a covincular pattern, both of length 3, with at most one restriction. We see familiar sequences, such as the Catalan and Motzkin numbers, but also some previously unknown sequences which have close links to other combinatorial objects such as lattice paths and integer partitions. Where possible we include a generating function for the enumeration. One of the cases considered settles a conjecture by Pudwell (2010) on the Wilf-equivalence of barred patterns. We also give an alternative proof of the classic result that permutations avoiding 123 are counted by the Catalan numbers.Comment: 24 pages, 11 figures, 2 table

Slowness: An Objective for Spike-Timing-Dependent Plasticity?

Slow Feature Analysis (SFA) is an efficient algorithm for learning input-output functions that extract the most slowly varying features from a quickly varying signal. It has been successfully applied to the unsupervised learning of translation-, rotation-, and other invariances in a model of the visual system, to the learning of complex cell receptive fields, and, combined with a sparseness objective, to the self-organized formation of place cells in a model of the hippocampus. In order to arrive at a biologically more plausible implementation of this learning rule, we consider analytically how SFA could be realized in simple linear continuous and spiking model neurons. It turns out that for the continuous model neuron SFA can be implemented by means of a modified version of standard Hebbian learning. In this framework we provide a connection to the trace learning rule for invariance learning. We then show that for Poisson neurons spike-timing-dependent plasticity (STDP) with a specific learning window can learn the same weight distribution as SFA. Surprisingly, we find that the appropriate learning rule reproduces the typical STDP learning window. The shape as well as the timescale are in good agreement with what has been measured experimentally. This offers a completely novel interpretation for the functional role of spike-timing-dependent plasticity in physiological neurons

Parallel Graph Partitioning for Complex Networks

Processing large complex networks like social networks or web graphs has recently attracted considerable interest. In order to do this in parallel, we need to partition them into pieces of about equal size. Unfortunately, previous parallel graph partitioners originally developed for more regular mesh-like networks do not work well for these networks. This paper addresses this problem by parallelizing and adapting the label propagation technique originally developed for graph clustering. By introducing size constraints, label propagation becomes applicable for both the coarsening and the refinement phase of multilevel graph partitioning. We obtain very high quality by applying a highly parallel evolutionary algorithm to the coarsened graph. The resulting system is both more scalable and achieves higher quality than state-of-the-art systems like ParMetis or PT-Scotch. For large complex networks the performance differences are very big. For example, our algorithm can partition a web graph with 3.3 billion edges in less than sixteen seconds using 512 cores of a high performance cluster while producing a high quality partition -- none of the competing systems can handle this graph on our system.Comment: Review article. Parallelization of our previous approach arXiv:1402.328

Networks as determinants of rural migration

This paper focuses on networks as determinants of rural migration and the importance of networks in a rural development perspective. Furthermore the impact of public goods and amenities on migration decisions in rural regions is investigated. Special attention is paid on heterogeneity in peoples migration-decisive components. Data base is a non-farm household-survey of four rural communities in Poland. The estimations show that migration decisions are influenceable in different ways: Social networks as well as socio-economic components and the regional public-good endowment are important drivers of migration, but the direction and amount of influence depends on individual-preferences and on individual network-structures - among other things especially on the network-localization.Migration, rural development, social networks, latent class model, Community/Rural/Urban Development, R23, D83, H41,