Efficient Multi-user Similarity Search Over Encrypted Data in Cloud Storage

Wireless Personal Communications - In cloud-assisted data outsourcing systems, the privacy of sensitive data is a major concern. Thus, data are uploaded in encrypted form in many cloud applications...     

Detailed assessment of mesh sensitivity for CFD simulation of coal combustion in a tangential-firing boiler

Journal of Mechanical Science and Technology - Computational fluid dynamics (CFD) has become an essential tool for optimizing the design and diagnosing the operation of a boiler. However, the...     

Hybrid approach of parallel implementation on CPU–GPU for high-speed ECDSA verification

The Journal of Supercomputing - Since the advent of deep belief network deep learning technology in 2006, artificial intelligence technology has been utilized in various convergence areas, such as...     

A Multi-service Group Key Management Scheme for Stateless Receivers in Wireless Mesh Networks

Wireless mesh networks facilitate the development of the many group oriented applications by extending the coverage area of the group communication. Group communication in a wireless mesh network is complicated due to dynamic intermediate mesh points, access control for communications between different administrative domains, and the absence of a centralized network controller. In this study, we propose a topology-matching decentralized multi-service group key management scheme for wireless mesh networks. It allows service providers to update and deliver their group keys to valid members in a distributed manner using the identity-based encryption scheme. The analysis result indicates that the proposed scheme has advantages with regard to the rekeying cost and storage overhead for a member and a mesh point in multi-sender group communication environments. The stateless property is also achieved such that a stateless member, who could not be constantly online, can easily decrypt the rekeying messages without recording the past history of transmission.     

Annealing behavior of TiO<Subscript>2</Subscript>-sheathed Ga<Subscript>2</Subscript>O<Subscript>3</Subscript> nanowires

TiO₂-sheathed Ga₂O₃ one-dimensional (1D) nanostructures were synthesized by thermal evaporation of GaN powders and then sputter-deposition of TiO₂. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis results indicate that the Ga₂O₃ cores are of a single crystal nature with a monoclinic structure while the TiO₂ shells are amorphous. Photoluminescence (PL) emission is slightly decreased in intensity by TiO₂ coating, but it is significantly increased by thermal annealing in an oxygen atmosphere. The emission peak is also shifted from ~500 to ~550 nm by oxygen annealing. The increase in the green emission is due to the increase in the concentration of the Ga vacancies in the cores by the inflow of oxygen during oxygen annealing. On the other hand, annealing in a nitrogen atmosphere leads to a red shift of the emission to ~700 nm originating from nitrogen doping.     

Developing strategic planning schemes for urban regeneration through mixed-use development in Seoul

Whilst the generic visions and directions of urban regeneration in cites are well documented, far less is understood about the strategic approaches to this issue which are being used in specific urban contexts. This paper investigates strategic planning schemes (SPSs) and visions for mixed-use development to support urban regeneration in Seoul (South Korea), using a combination of a literature review and a survey. The results contribute to understanding the construction of SPSs for future urban development as well as to improving strategic planning for urban regeneration on a wider scale.     

SALA: Smartphone-Assisted Localization Algorithm for Positioning Indoor IoT Devices

This paper proposes a Smartphone-Assisted Localization Algorithm (SALA) for the localization of Internet of Things (IoT) devices that are placed in indoor environments (e.g., smart home, smart office, smart mall, and smart factory). This SALA allows a smartphone to visually display the positions of IoT devices in indoor environments for the easy management of IoT devices, such as remote-control and monitoring. A smartphone plays a role of a mobile beacon that tracks its own position indoors by a sensor-fusion method with its motion sensors, such as accelerometer, gyroscope, and magnetometer. While moving around indoor, the smartphone periodically broadcasts short-distance beacon messages and collects the response messages from neighboring IoT devices. The response messages contains IoT device information. The smartphone stores the IoT device information in the response messages along with the message’s signal strength and its position into a dedicated server (e.g., home gateway) for the localization. These stored trace data are processed offline through our localization algorithm along with a given indoor layout, such as apartment layout. Through simulations, it is shown that our SALA can effectively localize IoT devices in an apartment with position errors less than 20 cm in a realistic apartment setting.     

A Simple and Enriched Closed-Form Formula for Cell Residence Time in 5G Heterogeneous Networks

Wireless Personal Communications - Libraries may become a liability for users security. Existing studies show that libraries can be exploited to propagate malware. Hackers utilize fake or modified...