Quarantine region scheme to mitigate spam attacks in wireless sensor networks

The Quarantine Region Scheme (QRS) is introduced to defend against spam attacks in wireless sensor networks where malicious antinodes frequently generate dummy spam messages to be relayed toward the sink. The aim of the attacker is the exhaustion of the sensor node batteries and the extra delay caused by processing the spam messages. Network-wide message authentication may solve this problem with a cost of cryptographic operations to be performed over all messages. QRS is designed to reduce this cost by applying authentication only whenever and wherever necessary. In QRS, the nodes that detect a nearby spam attack assume themselves to be in a quarantine region. This detection is performed by intermittent authentication checks. Once quarantined, a node continuously applies authentication measures until the spam attack ceases. In the QRS scheme, there is a tradeoff between the resilience against spam attacks and the number of authentications. Our experiments show that, in the worst-case scenario that we considered, a not quarantined node catches 80 percent of the spam messages by authenticating only 50 percent of all messages that it processe

An economic evaluation of tick line deregulation in Queensland

Rhipicephalus microplus, the cattle tick, is widely distributed across many tropical and subtropical regions of the world and has been identified as the most economically important species of tick across a number of countries. Quarantine boundaries currently limit the spread of the cattle tick into northern New South Wales, parts of South East Queensland, the central parts of the Northern Territory and northern parts of Western Australia. The Queensland tick line (or quarantine boundary) largely follows the 500mm rainfall isohyet until it reaches southern Queensland. As the cattle tick is unlikely to become endemic to regions receiving median rainfall less than 500mm per annum, the region most likely to be effected by a deregulation of the tick line is located in the south east corner of the State “inside” the 500mm isohyet but “outside” of the tick line. There are a number of strategies available to beef producers running susceptible cattle within the region impacted by a deregulation of the tick line. For example, they could: o choose to apply acaricides into the foreseeable future, o choose to breed tick resistance into their livestock and apply acaricides during the conversion period, o replace their susceptible breeding herds with tick resistant stock from within the tick endemic region, or o continue with susceptible livestock and implement sufficient quarantine and pest management strategies to reduce the risk of tick infestation to a negligible level The economic evaluation of these strategies indicates that the total costs of deregulation depend upon the type of response made by industry and the level of that response.Resource /Energy Economics and Policy,

Analysis of Grouper (Ephinephelus Spp.) Export Contribution to Own-source Revenue South Sulawesi Province

This study aims to Determine the exsports contribution of groupers against region income in south Sulawesi and determine the contribution of groupers the next fiveyears against region income in South Sulawesi. This research was conducted during two months on May to June in Fish Quarantine, Handling Quality and Safety of Fishery products in South Sulawesi. The method used is secondary data analysis is sets (search-discover) the source data/information including, Fish Quarantine, Handling Quality and Safety of Fishery products of Marine nd Fisheries Agency of South Sulawesi, then collect data already available (within the document) as well as normalize the data if needed and possible (make data from various sources be equal in the same shape). The data used is primary data and secondary data, primary data obtained from interview by Hall of the information field quarantine quality handling fish and Fishery and safety findings from marine and fisheries department staff in South Sulawesi Province about information PNBP export of grouper. Secondary data were obtained from Quarantine Fish, Quality Control and Safety of Marine and Fisheries Agency in South Sulawesi. Based on this research grouper export contrinution to the South Sulawesi Regional Revenue an average of 32% annually and in 2015 obtained the highes contribution in 63 % and the contribution of groupers expors in the next five years in 2020 for region income in South Sulawesi is Rp 507.600.000,-

Strategies for COVID-19 Pandemic Recovery. Applying Engineering Asset Management Principles

Versión preprint permitida por el editor Elsevier para subir a repositorios: http://sherpa.ac.uk/romeo/issn/2468-2667/es/Current COVID-19 pandemic available data for Spain, Andalusia an its eight provinces have been analyzed. Utilizing a model recently published to predict pandemic behavior, confinement measures and their economic impact are analyzed. Applying principles for effective and efficient management of engineering assets, decision-making implications of establishing confinement at national, regional or local (province) level are analyzed. The quarantine time is formulated as a function of the delay in taking confinement measures in the territories. The delay is measured in time since the free expansion in the territory is observed. Results discussions and analysis help to formulate a recommended strategy that is presented in the paper. We aim for: (i) design action plans by local level but(ii) controlled centralized by a unique decisionmaking center considering by country. Benefits of that strategy are measured in quarantine times beside GDP loss toll recovery. The strategy would be even more convenient when tackling with successive waves of the pandemic, requesting immediate action on local relapse

A practical optimal quarantine measure

Quarantine programs have generally provided an essential protection against the importation of exotic diseases, thus protecting both consumers and producers from major health concerns and pests and diseases that can potentially destroy local agricultural production. However, quarantine measures also impose costs in the form of expenditures on the quarantine program itself and the welfare losses that are associated with such trade restrictions. This paper develops a simple model to determine the optimal level of quarantine activity for imported livestock by minimizing the present-value of the direct costs of the disease, the cost of the quarantine program and any resulting welfare losses. The result defines a practical measure for the optimal number of infected livestock that may potentially enter a region in a given year. The model is then applied to the case of Ovine Johne’s Disease and its potential entry to the sheep industry in Western Australia. All key parameter values are subject to random variation and the optimal solution and sensitivity measures are obtained with a genetic algorithm

Implementing biosecurity measures on dairy farms in Ireland

peer-reviewedDairy farms in Ireland are expanding in preparation for a new era of unrestricted milk production with the elimination of the European Union (EU) production quotas in 2015. Countries experiencing a changing agricultural demographic, including farm expansion, can benefit from documenting the implementation of on-farm biosecurity. The objectives of this study were to document and describe influences on biosecurity practices and related opinions on dairy farms. A representative response rate of 64% was achieved to a nationwide telesurvey of farmers. A 20% discrepancy was found between self-declared and truly ‘closed’ herds indicating a lack of understanding of the closed herd concept. Although >72% of farmers surveyed considered biosecurity to be important, 53% stated that a lack of information might prevent them from improving their biosecurity. Logistic regression highlighted regional, age, and farm-size related differences in biosecurity practices and opinions towards its implementation. Farmers in the most dairy cattle dense region were three times more likely to quarantine purchased stock than were their equivalents in regions where dairy production was less intense (P = 0.012). Younger farmers in general were over twice as likely as middle-aged farmers to implement biosecurity guidelines (P = 0.026). The owners of large enterprises were almost five times more likely to join a voluntary animal health scheme (P = 0.003), and were over three times more likely to pay a premium price for health accredited animals (P = 0.02) than were those farming small holdings. The baseline data recorded in this survey will form the basis for more detailed sociological and demographic research which will facilitate the targeting of future training of the farming community in biosecurity