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OpenEHR is an open standard specification for developing flexible electronic health record (EHR) management system. It defines the standard service models and APIs, and offers a whole lifetime data storage method to the patient's record. As an important OpenEHR system component, EHRServer plays the role of back-end services repository for data storage and query. It complies with the openEHR specifications...
Open Platform Communication (OPC) also known as Object Linking and Embedding (OLE) for Process Control (OPC) is the platform for communication in automation and manufacturing fields among the group of networked devices. OPC standard supports the group of specifications known as OPC-Data Access (OPC-DA), OPC-Historical Data Access (OPC-HDA) and OPC-Unified Architecture (OPC-UA). In this paper, the...
OAuth is an open security standard that enables users to provide specific and time bound rights to an application to access protected user resources, stored on some external resource server, without needing them to share their credentials, with the application. Using OAuth, a client application gets one access token for further use through an HTTP redirect response from the resource server once the...
The paper presents a web-based platform able to offer access to one or more OPC UA Servers. The proposed platform may be used by web-users to exchange data with OPC UA Server without any knowledge of the standard. The software solution described in the paper is available on GitHub.
Hadoop is now the de facto standard for storing and processing big data, not only for unstructured data but also for some structured data. As a result, providing SQL analysis functionality to the big data resided in HDFS becomes more and more important. Hive is a pioneer system that supports SQL-like analysis to the data in HDFS. However, the performance of the early-version of Hive is not satisfactory...
In this paper, we advocate the notion of "BIG" cache as an innovative abstraction for effectively utilizing the distributed storage and processing capacities of all servers in a cache network. The "BIG" cache abstraction is proposed to partly address the problem of (cascade) thrashing in a hierarchical network of cache servers, where it has been known that cache resources at intermediate...
In-network processing pushes computational capabilities closer to the edge of the network, enabling new kinds of location-aware, real-time applications, while preserving bandwidth in the core network. This is done by offloading computations to more powerful or energy-efficient surrogates that are opportunistically available at the network edge. In mobile and heterogeneous usage contexts, the question...
This paper proposes an event detection module for distributed denial of service (DDoS) attacks on Internet of Things (IoT). Different from existing detection modules using knowledge-based filtering, the proposed module focuses on the system behavior under DDoS attacks and detects it utilizing information obtained from NTP used in synchronization service. We conducted demonstration experiments with...
The upcoming WebRTC-based browser-to-browser communication services present new challenges for user discovery in peer-to-peer mode. Even more so, if we wish to enable different web communication services to interact. This paper presents Identity Mapping and Discovery Service (IMaDS), a global, scalable, service independent discovery service that enables users of web-based peer-to-peer applications...
The scalability of n-tier systems relies on effective load balancing to distribute load among the servers of the same tier. We found that load balancing mechanisms (and some policies) in servers used in typical n-tier systems (e.g., Apache and Tomcat) have issues of instability when very long response time (VLRT) requests appear due to millibottlenecks, very short bottlenecks that last only tens to...
A scalable storage system becomes more important today for online social networks (OSNs) as the volume of user data increases rapidly. Key-value store uses consistent hashing to save data in a distributed manner. As a defacto standard, it has been widely used in production environments of many OSNs. However, the random nature of hashing always leads to high inter-server traffic. Recently, partitioning...
PIDs and PID Kernel Information, activities of the Research Data Alliance, have the potential to expand the utility and benefit of data provenance. The poster describes such expansion and outlines a study of the trade-offs of replacing the Research Object (RO) and OAI-ORE map solution of the SEAD publishing services with the PID Kernel Information approach.
Affordable and reliable supply chain visibility is becoming increasingly important as the complexity of the network underlying supply chains is becoming orders of magnitudeshigher compared to a decade ago. Moreover, this increase in complexity is starting to reflect on the cost of goods and their availability to the consumers. This paper addresses two key issues in the distribution phase of the supply...
In this paper we present the first cross-layer analysis of wireless LANs operating under downlink multi-user MIMO (MU-MIMO), considering the fundamental role played by closed-loop (TCP) traffic. In particular, we consider an 802.11ac scenario in which the access point transmits on the downlink via MU-MIMO, whereas stations must employ single-user transmissions on the uplink. With the help of analytical...
An enciphered method to sufficiently increase the security and privacy of data transmission applied in radio frequency identification system (RFID) was proposed. In this provided approach, a structure utilized suitably in electronic product code (EPC) compliant class-1 generation-2 system was studied to enable resistance to intruder aggression and attack by means of creating two-stage codes and virtual...
Maintainability of operation workflow is a critical issue for a telecom operator especially in a multi-vendor system environment. We demonstrate the implementation of an automated fault recovery workflow that is sustainable, versatile and applicable for fault management of both physical/virtual network functions.
The paper deals with numerical solution for time fractional-order diffusion-wave equation using explicit finite difference method in the web service form. This equation describes process of diffusion, process of heat conduction, process of fluid flow, process of mechanical vibration etc., which are part of technological processes in various fields of industry. In the paper is described mathematical...
There are already plenty of Internet of Things (IoT) architectures and systems available worldwide and this creates challenges for software development and systems entities that use these platforms. Global visibility and interoperability through the exposure of these platforms via the web can be achieved through a new paradigm to support an open framework for Web of Things (WoT), which is analogous...
The increased popularity of social media and mobile devices has radically changed the way people consume multimedia content online. As an example, users can experience the same event (e.g. a sports event or a concert) together using social media, even if they are not in the same physical location. Moreover, the introduction of the HTTP Adaptive Streaming principle has made it possible to deliver video...
Implementation of Web services technology in computer - aided design (CAD) systems and the problems involved are dealt with. Comparative evaluation of the possible software development methods based on Web services technology for platform-independent circuit CAD systems is made. General methodology of preliminary Web services testing and that of creating client applications in distributed platform-independent...
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