Design Patterns in Beeping Algorithms

We consider networks of processes which interact with beeps. In the basic model defined by Cornejo and Kuhn, which we refer to as the BL variant, processes can choose in each round either to beep or to listen. Those who beep are unable to detect simultaneous beeps. Those who listen can only distinguish between silence and the presence of at least one beep. Stronger variants exist where the nodes can also detect collision while they are beeping (B_{cd}L) or listening (BL_{cd}), or both (B_{cd}L_{cd}). Beeping models are weak in essence and even simple tasks are difficult or unfeasible with them. This paper starts with a discussion on generic building blocks (design patterns) which seem to occur frequently in the design of beeping algorithms. They include multi-slot phases: the fact of dividing the main loop into a number of specialised slots; exclusive beeps: having a single node beep at a time in a neighbourhood (within one or two hops); adaptive probability: increasing or decreasing the probability of beeping to produce more exclusive beeps; internal (resp. peripheral) collision detection: for detecting collision while beeping (resp. listening); and emulation of collision detection: for enabling this feature when it is not available as a primitive. We then provide algorithms for a number of basic problems, including colouring, 2-hop colouring, degree computation, 2-hop MIS, and collision detection (in BL). Using the patterns, we formulate these algorithms in a rather concise and elegant way. Their analyses (in the full version) are more technical, e.g. one of them relies on a Martingale technique with non-independent variables; another improves that of the MIS algorithm (P. Jeavons et al.) by getting rid of a gigantic constant (the asymptotic order was already optimal). Finally, we study the relative power of several variants of beeping models. In particular, we explain how every Las Vegas algorithm with collision detection can be converted, through emulation, into a Monte Carlo algorithm without, at the cost of a logarithmic slowdown. We prove that this slowdown is optimal up to a constant factor by giving a matching lower bound

Low earth orbit nanosatellite: influence of heat dissipation on passive thermal analysis

The use of small satellites in ambitious missions presents challenges related to thermal breakdowns as one of the critical issues contributing to their failure. Heat dissipation and thermal management are still the major challenges in nanosatellite systems design. To meet the thermal stability requirements, it becomes statutory to manage passive and active thermal control to reach this goal while a variety of factors, such as high-powered components, sunlight and shadow on orbit, or a tight spacecraft layout, remain imposed.A spherical nanosatellite thermal analysis was performed to show the effect of energy dissipation in a low earth orbit and the stability of the system with a special attention to batteries, which persist as the weak link among electronics parts. Additionally, a set of different material coatings was used to demonstrate their impact on the nanosatellite’s thermal behaviour, hence highlighting their importance while designing such a spacecraft

Cloud Security in Crypt Database Server Using Fine Grained Access Control

Information sharing in the cloud, powered by good patterns in cloud technology, is rising as a guaranteeing procedure for permitting users to advantageously access information. However, the growing number of enterprises and customers who stores their information in cloud servers is progressively challenging users’ privacy and the security of information. This paper concentrates on providing a dependable and secure cloud information sharing services that permits users dynamic access to their information. In order to achieve this, propose an effective, adaptable and flexible privacy preserving information policy with semantic security, by using Cipher text Policy Element Based Encryption (CP-EBE) consolidated with Character Based Encryption (CBE) systems. To ensure strong information sharing security, the policy succeeds in protecting the privacy of cloud users and supports efficient and secure dynamic operations, but not constrained to, file creation, user revocation. Security analysis demonstrates that the proposed policy is secure under the generic bi- linear group model in the random oracle model and enforces fine-grained access control, full collusion resistance and retrogressive secrecy. Furthermore, performance analysis and experimental results demonstrate that the overheads are as light as possible

Delegation of Authority and Employee Performance Affect Management Decision Making Effectiveness in PT. Solusi Guna Sejahtera-Bekasi

This study explores the relationship between effective Delegation of authority and employee performance, highlighting the importance of clear communication, trust-building, and well-defined responsibilities in managerial decision-making. It examines the role of Delegation as a strategic tool for managers to empower employees and the impact of employee performance on management decision-making. High-performing employees can contribute valuable insights, innovative ideas, and data-based recommendations, while poor performance can lead to errors, misjudgments, and suboptimal choices. The interaction between Delegation and employee performance is analyzed, revealing a symbiotic relationship. Effective Delegation can stimulate employee engagement and motivation, leading to improved performance, while outstanding performance can strengthen managers' confidence in delegations, allowing them to entrust more responsibility to employees. On a scale of 1 to 5, the statements in the questionnaire are rated. SEM (Structural Equal Model) analysis on SmartPLS 4.0 in use the research findings indicate that (1) employee performance positively influences managerial decision-making, and (2) delegation positively influences managerial decision-making

Kiribati and Climate Displacement: How the Pacific Engagement Visa can help

The introduction of Australia’s Pacific Engagement Visa (PEV) represents a new era for Pacific migration. Announced in May 2022, the PEV will provide a new climate security pathway for small islands. However, it is not clear how the new visas will be allocated across the Pacific, or whether preferential access will be given to smaller island nations like Kiribati, which are more vulnerable to rising sea levels. This In Brief explores the potential opportunities the PEV could provide Kiribati given that there are no international laws or other mechanisms to protect climate-displaced persons (McAdam 2012). I-Kiribati see the new visa as an expression of te utu (family) values, in particular the obligation of families to assist each other in times of needs. By helping populations most affected by climate change, Australia is showing regional leadership.Australian Department of Foreign Affairs and Trad

EDUCATION, MÉDIAS & PUBLICS EN ALGÉRIE

Served by their strategic position at the crossroads of social exchanges, due to the slow but steady decline in the role of traditional institutions such as religion, family and school, and with the rapid technological development experienced by the information and communication sector, the media have acquired today a remarkable influence in the process of socialization and education of the young. But while the action of the traditional actors mentioned above provide direction and guidance, that of the media, as a whole, follow a logic of consumption that is at odds with the quality requirements of the general interest. As such, the Algerian user, in particular, on the one hand is weighed down by the mediocrity of the local media and cultural output and on the other hand, suffers the brunt of the onslaught of globalized and often inadequate digital content that the Internet pours out continuously. As a result, the public, especially the young, loses its bearings and becomes easily manipulated. By empowering him and strengthening his critical awareness and capacity for discernment, media literacy would help him develop a citizenship that is democratic, active, participative and responsible at the same time