3,294 research outputs found
A Survey on Load Balancing Algorithms for VM Placement in Cloud Computing
The emergence of cloud computing based on virtualization technologies brings
huge opportunities to host virtual resource at low cost without the need of
owning any infrastructure. Virtualization technologies enable users to acquire,
configure and be charged on pay-per-use basis. However, Cloud data centers
mostly comprise heterogeneous commodity servers hosting multiple virtual
machines (VMs) with potential various specifications and fluctuating resource
usages, which may cause imbalanced resource utilization within servers that may
lead to performance degradation and service level agreements (SLAs) violations.
To achieve efficient scheduling, these challenges should be addressed and
solved by using load balancing strategies, which have been proved to be NP-hard
problem. From multiple perspectives, this work identifies the challenges and
analyzes existing algorithms for allocating VMs to PMs in infrastructure
Clouds, especially focuses on load balancing. A detailed classification
targeting load balancing algorithms for VM placement in cloud data centers is
investigated and the surveyed algorithms are classified according to the
classification. The goal of this paper is to provide a comprehensive and
comparative understanding of existing literature and aid researchers by
providing an insight for potential future enhancements.Comment: 22 Pages, 4 Figures, 4 Tables, in pres
Multi-modal Embedding Fusion-based Recommender
Recommendation systems have lately been popularized globally, with primary
use cases in online interaction systems, with significant focus on e-commerce
platforms. We have developed a machine learning-based recommendation platform,
which can be easily applied to almost any items and/or actions domain. Contrary
to existing recommendation systems, our platform supports multiple types of
interaction data with multiple modalities of metadata natively. This is
achieved through multi-modal fusion of various data representations. We
deployed the platform into multiple e-commerce stores of different kinds, e.g.
food and beverages, shoes, fashion items, telecom operators. Here, we present
our system, its flexibility and performance. We also show benchmark results on
open datasets, that significantly outperform state-of-the-art prior work.Comment: 7 pages, 8 figure
A component-based collaboration infrastructure
Groupware applications allow geographically distributed users to collaborate
on shared tasks. However, it is widely recognized that groupware applications are
expensive to build due to coordination services and group dynamics, neither of which
is present in single-user applications. Previous collaboration transparency systems
reuse existing single-user applications as a whole for collaborative work, often at
the price of inflexible coordination. Previous collaboration awareness systems, on
the other hand, provide reusable coordination services and multi-user widgets, but
often with two weaknesses: (1) the multi-user widgets provided are special-purpose
and limited in number, while no guidelines are provided for developing multi-user
interface components in general; and (2) they often fail to reach the desired level of flexibility in coordination by tightly binding shared data and coordination services.
In this dissertation, we propose a component-based approach to developing group-
ware applications that addresses the above two problems. To address the first prob-
lem, we propose a shared component model for modeling data and graphic user inter-
face(GUI) components of groupware applications. As a result, the myriad of existing
single-user components can be re-purposed as shared GUI or data components. An
adaptation tool is developed to assist the adaptation process.
To address the second problem, we propose a coordination service framework
which systematically model the interaction between user, data, and coordination
protocols. Due to the clean separation of data and control and the capability to dynamically "glue" them together, the framework provides reusable services such as
data distribution, persistence, and adaptable consistency control. The association
between data and coordination services can be dynamically changed at runtime.
An Evolvable and eXtensible Environment for Collaboration (EXEC) is built to
evaluate the proposed approach. In our experiments, we demonstrate two benefits of
our approach: (1) a group of common groupware features adapted from existing single-
user components are plugged in to extend the functionalities of the environment itself;
and (2)coordination services can be dynamically attached to and detached from these
shared components at different granules to support evolving collaboration needs
Developing Collaborative XML Editing Systems
In many areas the eXtensible Mark-up Language (XML) is becoming the standard exchange and data format. More and more applications not only support XML as an exchange format but also use it as their data model or default file format for graphic, text and database (such as spreadsheet) applications. Computer Supported Cooperative Work is an interdisciplinary field of research dealing with group work, cooperation and their supporting information and communication technologies. One part of it is Real-Time Collaborative Editing, which investigates the design of systems which allow several persons to work simultaneously in real-time on the same document, without the risk of inconsistencies.
Existing collaborative editing research applications specialize in one or at best, only a small number of document types; for example graphic, text or spreadsheet documents. This research investigates the development of a software framework which allows collaborative editing of any XML document type in real-time. This presents a more versatile solution to the problems of real-time collaborative editing.
This research contributes a new software framework model which will assist software engineers in the development of new collaborative XML editing applications. The devised framework is flexible in the sense that it is easily adaptable to different workflow requirements covering concurrency control, awareness mechanisms and optional locking of document parts. Additionally this thesis contributes a new framework integration strategy that enables enhancements of existing single-user editing
applications with real-time collaborative editing features without changing their source code
A Review of Platforms for the Development of Agent Systems
Agent-based computing is an active field of research with the goal of
building autonomous software of hardware entities. This task is often
facilitated by the use of dedicated, specialized frameworks. For almost thirty
years, many such agent platforms have been developed. Meanwhile, some of them
have been abandoned, others continue their development and new platforms are
released. This paper presents a up-to-date review of the existing agent
platforms and also a historical perspective of this domain. It aims to serve as
a reference point for people interested in developing agent systems. This work
details the main characteristics of the included agent platforms, together with
links to specific projects where they have been used. It distinguishes between
the active platforms and those no longer under development or with unclear
status. It also classifies the agent platforms as general purpose ones, free or
commercial, and specialized ones, which can be used for particular types of
applications.Comment: 40 pages, 2 figures, 9 tables, 83 reference
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