Required service rate for mixed traffic

В данной работе нами получены границы для скорости обслуживания при некоторых ограничениях на характеристики обслуживания в неоднородной модели входящего трафика, основанной на сумме независимых фрактального броуновского движения и симметричного $\alpha$-устойчивого движения Леви с разными коэффициентами Херста $H_1$ и $H_2=1/\alpha$. Хорошо известно, что для процессов, приращения которых имеют тяжёлые хвосты, методы расчета эффективной пропускной способности, основанные на производящей функции моментов входящего потока, не применимы. Однако существуют простые соотношения между характеристиками потока, скоростью обслуживания $C$ и вероятностями $\varepsilon(b)$ переполнения для конечного и бесконечного буфера, из которых при фиксированном значении $\varepsilon(b)$ можно выразить $C$. In this paper we analyse the nonhomogenous traffic model based on sum of independent Fractional Brownian motion and symmetric $\alpha$-stable Levy process with different Hurst exponents $H_1$ and $H_2=1/\alpha$ and present bounds for the required service rate under QoS constraints. It is well known that for the processes with long-tailed increments effective bandwidths are not expressed by means of the moment generating function of the input flow. However we can derive simple relations between the flow parameters, service rate $C$ and overflow probabilities $\varepsilon (b)$ for finite and infinite buffer. In this way it is possible to find required service rate $C$ under a constraint on maximum overflow probability.

Development of a Required Service-Learning Course: Lessons Learned and Stakeholders’ Perceptions

There is a growing movement for universities to include high-impact educational practices. This study explores the implementation and efficacy of one such practice in a construction management undergraduate program. During a recent curriculum revision, faculty decided to include a required service-learning course in the curriculum to enhance both student learning and civic engagement. The course assimilates all components of the construction process. Key assessments of the course include: written proposal & preconstruction presentation to the owner, project update reports, a mid-semester site inspection, and a final presentation accompanied by a written reflection. Students and owners voluntarily completed surveys at the end of the semester to determine the elements requiring improvement, elements that should remain unchanged, and the perceived knowledge gain through the experience. The results indicate the project owners were satisfied and the students acknowledged learning benefits. Owners, students and faculty all noted major challenges/frustrations with the course and the need for improvement. The paper summarizes the data to evaluate the efficacy of the required course and highlights lessons learned to improve the course. Dissemination of the results may be useful in starting or improving service-learning courses at other institutions.

On the Use of Similarity or Query Languages in Cloud Discovery Based on Ontology

Cloud computing is increasingly used so that the number of providers offering services is rapidly increasing. Thus, a need to organize these services and to express relations between them arises. To answer this need, ontologies are used. To query these services, the authors use query languages, such as SPARQL, that return two types of results: either a list of required services, or an empty list. However, the second result is not desired. In fact, if the required service is not available, users want to be offered by a list of similar ones instead of the empty list. It is in this sense that the similarity, which provides more results ranked according to their utilities, is used. This paper first presents the Cloud ontology on which the authors' work is based. It then defines and compares between two Cloud service discovery methods which are: the discovery based on query languages and the discovery based on similarity. To show the efficiency of the search based on similarity, the authors propose a search engine that allows the users to query services using a simple to use interface.

What Does Neoliberalism Have to Do with Teaching Research Writing?

Ask any progressive educator the question posed by my title, and you won’t have to wait long for an answer: everything. From the size of the class, to the quality of the computer lab, to the costs of textbooks, to the demographics and the class schedules of the students, to the workload and the compensation of faculty assigned to teach them—it is just so easy to name a few of the obvious material factors signaling the neoliberal economy’s effect on how we teach required service classes like research writing (or any course, for that matter). By and large, we share basic understandings about that history, so I am not going to rehearse it here.

Reusable Business Tier Components

Call Level Interfaces (CLI) are software API used for building business tiers of relational database applications whenever performance is a key requirement. Nevertheless, their use is cumbersome, mainly in large database applications with many and complex Create, Read, Update and Delete (CRUD) expressions. CLI are low level API conveying several difficulties during the development process of relational business tiers. Four of them are herein emphasized: 1) Programmers need to master the schemas of the underlying databases; 2) the same CRUD expression is frequently re-written to address different business needs; 3) CLI are not suited to cope with evolving business tiers and, finally, 4) CLI do not provide any feature to decouple development process of relational business tiers from the development process of application tiers. To tackle these difficulties, this paper proposes an architecture for building reusable relational business tier components based on CLI herein referred to as the Reusable Business Tier Architecture (RBTA). It relies on a customizable wide typed service to address a business area, such as accountability. The typed service is able to manage CRUD expressions, deployed at runtime, on behalf of application tiers and in accordance with users' needs. The only constraint is that the required service to manage each CRUD expression must be a sub-set of the implemented wide typed service. A proof of concept is also presented.

Effect of Particle Sizes on the Reinforcing Properties of Locally Sourced Filler in Rubber Vulcanisate

The effect of particle sizes on the reinforcing properties of locally sourced filler (P.K.S) on rubber compound (foot mat) was investigated. This was also compared with the characteristics of kaolin filled vulcanisate. Various particle sizes of kaolin and palm kernel shell (P.K.S); 75µm, 150µm, 212µm and 300µm were used. Different physical tests relating to the required service conditions (hardness and compression set) were carried out on the vulcanisate. From the results, it was observed that P.K.S (pH of 6.25 and moisture content of 10.9%) at particle sizes 75µm and 212µm had better hardness and compression set resistance and this could be recommended for products where these properties are desired.