Biblio

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2020-02-17
Pérez García, Julio César, Ortiz Guerra, Erik, Barriquello, Carlos Henrique, Dalla Costa, Marco Antônio, Reguera, Vitalio Alfonso.  2019.  Faster-Than-Nyquist Signaling for Physical Layer Security on Wireless Smart Grid. 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America). :1–6.
Wireless networks offer great flexibility and ease of deployment for the rapid implementation of smart grids. However, these data network technologies are prone to security issues. Especially, the risk of eavesdropping attacks increases due to the inherent characteristics of the wireless medium. In this context, physical layer security can augment secrecy through appropriate coding and signal processing. In this paper we consider the use of faster-than-Nyquist signaling to introduce artificial noise in the wireless network segment of the smart grid; with the aim of reinforce the information security at the physical layer. The results show that the proposed scheme can significantly improves the secrecy rate of the channel. Guaranteeing, in coexistence with other security mechanisms and despite the presence of potential eavesdroppers, a reliable and secure flow of information for smart grids.
2020-01-28
Monaco, John V..  2019.  Feasibility of a Keystroke Timing Attack on Search Engines with Autocomplete. 2019 IEEE Security and Privacy Workshops (SPW). :212–217.
Many websites induce the browser to send network traffic in response to user input events. This includes websites with autocomplete, a popular feature on search engines that anticipates the user's query while they are typing. Websites with this functionality require HTTP requests to be made as the query input field changes, such as when the user presses a key. The browser responds to input events by generating network traffic to retrieve the search predictions. The traffic emitted by the client can expose the timings of keyboard input events which may lead to a keylogging side channel attack whereby the query is revealed through packet inter-arrival times. We investigate the feasibility of such an attack on several popular search engines by characterizing the behavior of each website and measuring information leakage at the network level. Three out of the five search engines we measure preserve the mutual information between keystrokes and timings to within 1% of what it is on the host. We describe the ways in which two search engines mitigate this vulnerability with minimal effects on usability.
2020-04-17
Xie, Cihang, Wu, Yuxin, Maaten, Laurens van der, Yuille, Alan L., He, Kaiming.  2019.  Feature Denoising for Improving Adversarial Robustness. 2019 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). :501—509.
Adversarial attacks to image classification systems present challenges to convolutional networks and opportunities for understanding them. This study suggests that adversarial perturbations on images lead to noise in the features constructed by these networks. Motivated by this observation, we develop new network architectures that increase adversarial robustness by performing feature denoising. Specifically, our networks contain blocks that denoise the features using non-local means or other filters; the entire networks are trained end-to-end. When combined with adversarial training, our feature denoising networks substantially improve the state-of-the-art in adversarial robustness in both white-box and black-box attack settings. On ImageNet, under 10-iteration PGD white-box attacks where prior art has 27.9% accuracy, our method achieves 55.7%; even under extreme 2000-iteration PGD white-box attacks, our method secures 42.6% accuracy. Our method was ranked first in Competition on Adversarial Attacks and Defenses (CAAD) 2018 — it achieved 50.6% classification accuracy on a secret, ImageNet-like test dataset against 48 unknown attackers, surpassing the runner-up approach by 10%. Code is available at https://github.com/facebookresearch/ImageNet-Adversarial-Training.
2020-03-09
Zakaria, Khairun Nisyak, Zainal, Anazida, Othman, Siti Hajar, Kassim, Mohamad Nizam.  2019.  Feature Extraction and Selection Method of Cyber-Attack and Threat Profiling in Cybersecurity Audit. 2019 International Conference on Cybersecurity (ICoCSec). :1–6.
Public sector and private organizations began using cybersecurity control in order to defend their assets against cybercriminals attack. Cybersecurity audits assist organizations to deal with cyber threats, cybercriminals, and cyber-attacks thatare growing in an aggressive cyber landscape. However, cyber-attacks and threats become more increase and complex in complicated cyber landscapes challenge auditors to perform an effective cybersecurity audit. This current situation puts in evidens ce the critical need for a new approach in the cybersecurity audit execution. This study reviews an alternative method in the execution of cybersecurity security checks. The analysis is on the character and behavioral of cyber-attacks and threats using feature extraction and selection method to get crucial elements from the common group of cyber-attacks and threats. Cyber-attacks and threats profile are systematic approaches driven by a clear understanding of the form of cyber-attacks and threats character and behavior patterns in cybersecurity requirements. As a result, this study proposes cyber-attacks and threats profiling for cybersecurity audit as a set of control elements that are harmonized with audit components that drive audits based on cyber threats.
2020-02-24
Ahmadi-Assalemi, Gabriela, al-Khateeb, Haider M., Epiphaniou, Gregory, Cosson, Jon, Jahankhani, Hamid, Pillai, Prashant.  2019.  Federated Blockchain-Based Tracking and Liability Attribution Framework for Employees and Cyber-Physical Objects in a Smart Workplace. 2019 IEEE 12th International Conference on Global Security, Safety and Sustainability (ICGS3). :1–9.
The systematic integration of the Internet of Things (IoT) and Cyber-Physical Systems (CPS) into the supply chain to increase operational efficiency and quality has also introduced new complexities to the threat landscape. The myriad of sensors could increase data collection capabilities for businesses to facilitate process automation aided by Artificial Intelligence (AI) but without adopting an appropriate Security-by-Design framework, threat detection and response are destined to fail. The emerging concept of Smart Workplace incorporates many CPS (e.g. Robots and Drones) to execute tasks alongside Employees both of which can be exploited as Insider Threats. We introduce and discuss forensic-readiness, liability attribution and the ability to track moving Smart SPS Objects to support modern Digital Forensics and Incident Response (DFIR) within a defence-in-depth strategy. We present a framework to facilitate the tracking of object behaviour within Smart Controlled Business Environments (SCBE) to support resilience by enabling proactive insider threat detection. Several components of the framework were piloted in a company to discuss a real-life case study and demonstrate anomaly detection and the emerging of behavioural patterns according to objects' movement with relation to their job role, workspace position and nearest entry or exit. The empirical data was collected from a Bluetooth-based Proximity Monitoring Solution. Furthermore, a key strength of the framework is a federated Blockchain (BC) model to achieve forensic-readiness by establishing a digital Chain-of-Custody (CoC) and a collaborative environment for CPS to qualify as Digital Witnesses (DW) to support post-incident investigations.
2020-01-21
Selvanathan, Nirojan, Jayakody, Dileepa, Damjanovic-Behrendt, Violeta.  2019.  Federated Identity Management and Interoperability for Heterogeneous Cloud Platform Ecosystems. Proceedings of the 14th International Conference on Availability, Reliability and Security. :1–7.
This paper describes an approach to overcome the interoperability challenges related to identity management systems supporting cross-collaboration between heterogeneous manufacturing platforms. Traditional identity management systems have shown many weaknesses when it comes to cloud platforms and their federations, from not being able to support a simplified login process, to information disclosure and complexity of implementation in practice. This paper discusses workflows to practically implement federated identity management across the heterogeneous manufacturing platforms and design interoperability at different levels, e.g. at the platform level and at the platform integration level. Our motivation to find the best federated identity management solution for heterogeneous cloud-based platforms is related to practical requirements coming from the ongoing European project eFactory.
2020-01-13
Hu, Jizhou, Qu, Hemi, Guo, Wenlan, Chang, Ye, Pang, Wei, Duan, Xuexin.  2019.  Film Bulk Acoustic Wave Resonator for Trace Chemical Warfare Agents Simulants Detection in Micro Chromatography. 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems Eurosensors XXXIII (TRANSDUCERS EUROSENSORS XXXIII). :45–48.
This paper reported the polymer coated film bulk acoustic resonators (FBAR) as a sensitive detector in micro chromatography for the detection of trace chemical warfare agents (CWA) simulants. The FBAR sensor was enclosed in a microfluidic channel and then coupled with microfabricated separation column. The subsequent chromatographic analysis successfully demonstrated the detection of parts per billion (ppb) concentrations of chemical warfare agents (CWAs) simulants in a five components gas mixture. This work represented an important step toward the realization of FBAR based handheld micro chromatography for CWA detection in the field.
2019-09-23
Zheng, N., Alawini, A., Ives, Z. G..  2019.  Fine-Grained Provenance for Matching ETL. 2019 IEEE 35th International Conference on Data Engineering (ICDE). :184–195.
Data provenance tools capture the steps used to produce analyses. However, scientists must choose among workflow provenance systems, which allow arbitrary code but only track provenance at the granularity of files; provenance APIs, which provide tuple-level provenance, but incur overhead in all computations; and database provenance tools, which track tuple-level provenance through relational operators and support optimization, but support a limited subset of data science tasks. None of these solutions are well suited for tracing errors introduced during common ETL, record alignment, and matching tasks - for data types such as strings, images, etc. Scientists need new capabilities to identify the sources of errors, find why different code versions produce different results, and identify which parameter values affect output. We propose PROVision, a provenance-driven troubleshooting tool that supports ETL and matching computations and traces extraction of content within data objects. PROVision extends database-style provenance techniques to capture equivalences, support optimizations, and enable selective evaluation. We formalize our extensions, implement them in the PROVision system, and validate their effectiveness and scalability for common ETL and matching tasks.
2020-01-27
Rocamora, Josyl Mariela, Ho, Ivan Wang-Hei, Mak, Man-Wai.  2019.  Fingerprint Quality Classification for CSI-based Indoor Positioning Systems. Proceedings of the ACM MobiHoc Workshop on Pervasive Systems in the IoT Era. :31–36.
Recent indoor positioning systems that utilize channel state information (CSI) consider ideal scenarios to achieve high-accuracy performance in fingerprint matching. However, one essential component in achieving high accuracy is the collection of high-quality fingerprints. The quality of fingerprints may vary due to uncontrollable factors such as environment noise, interference, and hardware instability. In our paper, we propose a method for collecting high-quality fingerprints for indoor positioning. First, we have developed a logistic regression classifier based on gradient descent to evaluate the quality of the collected channel frequency response (CFR) samples. We employ the classifier to sift out poor CFR samples and only retain good ones as input to the positioning system. We discover that our classifier can achieve high classification accuracy from over thousands of CFR samples. We then evaluate the positioning accuracy based on two techniques: Time-Reversal Resonating Strength (TRRS) and Support Vector Machines (SVM). We find that the sifted fingerprints always result in better positioning performance. For example, an average percentage improvement of 114% for TRRS and 22% for SVM compared to that of unsifted fingerprints of the same 40-MHz effective bandwidth.
2020-02-24
De, Asmit, Basu, Aditya, Ghosh, Swaroop, Jaeger, Trent.  2019.  FIXER: Flow Integrity Extensions for Embedded RISC-V. 2019 Design, Automation Test in Europe Conference Exhibition (DATE). :348–353.
With the recent proliferation of Internet of Things (IoT) and embedded devices, there is a growing need to develop a security framework to protect such devices. RISC-V is a promising open source architecture that targets low-power embedded devices and SoCs. However, there is a dearth of practical and low-overhead security solutions in the RISC-V architecture. Programs compiled using RISC-V toolchains are still vulnerable to code injection and code reuse attacks such as buffer overflow and return-oriented programming (ROP). In this paper, we propose FIXER, a hardware implemented security extension to RISC-V that provides a defense mechanism against such attacks. FIXER enforces fine-grained control-flow integrity (CFI) of running programs on backward edges (returns) and forward edges (calls) without requiring any architectural modifications to the RISC-V processor core. We implement FIXER on RocketChip, a RISC-V SoC platform, by leveraging the integrated Rocket Custom Coprocessor (RoCC) to detect and prevent attacks. Compared to existing software based solutions, FIXER reduces energy overhead by 60% at minimal execution time (1.5%) and area (2.9%) overheads.
2019-12-16
Zhu, Yan, Yang, Shuai, Chu, William Cheng-Chung, Feng, Rongquan.  2019.  FlashGhost: Data Sanitization with Privacy Protection Based on Frequent Colliding Hash Table. 2019 IEEE International Conference on Services Computing (SCC). :90–99.
Today's extensive use of Internet creates huge volumes of data by users in both client and server sides. Normally users don't want to store all the data in local as well as keep archive in the server. For some unwanted data, such as trash, cache and private data, needs to be deleted periodically. Explicit deletion could be applied to the local data, while it is a troublesome job. But there is no transparency to users on the personal data stored in the server. Since we have no knowledge of whether they're cached, copied and archived by the third parties, or sold by the service provider. Our research seeks to provide an automatic data sanitization system to make data could be self-destructing. Specifically, we give data a life cycle, which would be erased automatically when at the end of its life, and the destroyed data cannot be recovered by any effort. In this paper, we present FlashGhost, which is a system that meets this challenge through a novel integration of cryptography techniques with the frequent colliding hash table. In this system, data will be unreadable and rendered unrecoverable by overwriting multiple times after its validity period has expired. Besides, the system reliability is enhanced by threshold cryptography. We also present a mathematical model and verify it by a number of experiments, which demonstrate theoretically and experimentally our system is practical to use and meet the data auto-sanitization goal described above.
2020-01-21
Ferretti, Luca, Marchetti, Mirco, Colajanni, Michele.  2019.  Fog-Based Secure Communications for Low-Power IoT Devices. ACM Transactions on Internet Technology (TOIT). 19:27:1-27:21.
Designing secure, scalable, and resilient IoT networks is a challenging task because of resource-constrained devices and no guarantees of reliable network connectivity. Fog computing improves the resiliency of IoT, but its security model assumes that fog nodes are fully trusted. We relax this latter constraint by proposing a solution that guarantees confidentiality of messages exchanged through semi-honest fog nodes thanks to a lightweight proxy re-encryption scheme. We demonstrate the feasibility of the solution by applying it to IoT networks of low-power devices through experiments on microcontrollers and ARM-based architectures.
2020-01-13
Dyyak, Ivan, Horlatch, Vitaliy, Shynkarenko, Heorhiy.  2019.  Formulation and Numerical Analysis of Acoustics Problems in Coupled Thermohydroelastic Systems. 2019 XXIVth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). :168–171.
The coupled thermohydroelastic processes of acoustic wave and heat propagation in weak viscous fluid and elastic bodies form the basis of dissipative acoustics. The problems of dissipative acoustics have many applications in engineering practice, in particular in the development of appropriate medical equipment. This paper presents mathematical models for time and frequency domain problems in terms of unknown displacements and temperatures in both the fluid and the elastic body. Formulated corresponding variational problems and constructed numerical schemes for their solution based on the Galerkin approximations. The method of proving the well-posedness of the considered variational problems is proposed.
2020-04-13
R P, Jagadeesh Chandra Bose, Singi, Kapil, Kaulgud, Vikrant, Phokela, Kanchanjot Kaur, Podder, Sanjay.  2019.  Framework for Trustworthy Software Development. 2019 34th IEEE/ACM International Conference on Automated Software Engineering Workshop (ASEW). :45–48.
Intelligent software applications are becoming ubiquitous and pervasive affecting various aspects of our lives and livelihoods. At the same time, the risks to which these systems expose the organizations and end users are growing dramatically. Trustworthiness of software applications is becoming a paramount necessity. Trust is to be regarded as a first-class citizen in the total product life cycle and should be addressed across all stages of software development. Trust can be looked at from two facets: one at an algorithmic level (e.g., bias-free, discrimination-aware, explainable and interpretable techniques) and the other at a process level by making development processes more transparent, auditable, and adhering to regulations and best practices. In this paper, we address the latter and propose a blockchain enabled governance framework for building trustworthy software. Our framework supports the recording, monitoring, and analysis of various activities throughout the application development life cycle thereby bringing in transparency and auditability. It facilitates the specification of regulations and best practices and verifies for its adherence raising alerts of non-compliance and prescribes remedial measures.
2020-01-20
Wang, Ti, Ma, Hui, Zhou, Yongbin, Zhang, Rui, Song, Zishuai.  2019.  Fully Accountable Data Sharing for Pay-As-You-Go Cloud Scenes. IEEE Transactions on Dependable and Secure Computing. :1–1.
Many enterprises and individuals prefer to outsource data to public cloud via various pricing approaches. One of the most widely-used approaches is the pay-as-you-go model, where the data owner hires public cloud to share data with data consumers, and only pays for the actually consumed services. To realize controllable and secure data sharing, ciphertext-policy attribute-based encryption (CP-ABE) is a suitable solution, which can provide fine-grained access control and encryption functionalities simultaneously. But there are some serious challenges when applying CP-ABE in pay-as-you-go. Firstly, the decryption cost in ABE is too heavy for data consumers. Secondly, ABE ciphertexts probably suffer distributed denial of services (DDoS) attacks, but there is no solution that can eliminate the security risk. At last, the data owner should audit resource consumption to guarantee the transparency of charge, while the existing method is inefficient. In this work, we propose a general construction named fully accountable ABE (FA-ABE), which simultaneously solves all the challenges by supporting all-sided accountability in the pay-as-you-go model. We formally define the security model and prove the security in the standard model. Also, we implement an instantiate construction with the self-developed library libabe. The experiment results indicate the efficiency and practicality of our construction.
2020-02-10
Singh, Neeraj Kumar, Mahajan, Vasundhara.  2019.  Fuzzy Logic for Reducing Data Loss during Cyber Intrusion in Smart Grid Wireless Network. 2019 IEEE Student Conference on Research and Development (SCOReD). :192–197.
Smart grid consists of smart devices to control, record and analyze the grid power flow. All these devices belong to the latest technology, which is used to interact through the wireless network making the grid communication network vulnerable to cyber attack. This paper deals with a novel approach using altering the Internet Protocol (IP) address of the smart grid communication network using fuzzy logic according to the degree of node. Through graph theory approach Wireless Communication Network (WCN) is designed by considering each node of the system as a smart sensor. In this each node communicates with other nearby nodes for exchange of data. Whenever there is cyber intrusion the WCN change its IP using proposed fuzzy rules, where higher degree nodes are given the preference to change first with extreme IP available in the system. Using the proposed algorithm, different IEEE test systems are simulated and compared with existing Dynamic Host Configuration Protocol (DHCP). The fuzzy logic approach reduces the data loss and improves the system response time.
2020-02-17
Rodriguez, Ariel, Okamura, Koji.  2019.  Generating Real Time Cyber Situational Awareness Information Through Social Media Data Mining. 2019 IEEE 43rd Annual Computer Software and Applications Conference (COMPSAC). 2:502–507.
With the rise of the internet many new data sources have emerged that can be used to help us gain insights into the cyber threat landscape and can allow us to better prepare for cyber attacks before they happen. With this in mind, we present an end to end real time cyber situational awareness system which aims to efficiently retrieve security relevant information from the social networking site Twitter.com. This system classifies and aggregates the data retrieved and provides real time cyber situational awareness information based on sentiment analysis and data analytics techniques. This research will assist security analysts to evaluate the level of cyber risk in their organization and proactively take actions to plan and prepare for potential attacks before they happen as well as contribute to the field through a cybersecurity tweet dataset.
2020-01-27
Cayabyab, Gerald T., Sison, Ariel M., Hernandez, Alexander A..  2019.  GISKOP: A Modified Key Scheduling Operation of International Data Encryption Algorithm Using Serpent Key Scheduling. Proceedings of the 2nd International Conference on Computing and Big Data. :53–57.
Cryptography is a method of storing and transmitting data in a particular form. Only those for whom it is intended can read, use it, and return it back to the original data by using various techniques. The International Data Encryption Algorithm "IDEA" is a block cipher that works with 64-bit plaintext block and ciphertext blocks and it has a 128-bit input key. This paper describe the designing and implementation of a modified key schedule operation of IDEA called GISKOP. It uses the same number of rounds and output transformation that operates using 128 bit user input plaintext and a modified way of key scheduling operation of 256 bit keys. The modified algorithm uses Serpent key scheduling operation to derive the different sub keys to be used in each rounds. The algorithm was implemented to provide better security on user's password within the Document Management System to protect user's data within the cloud database. It has gone through initial testing and evaluations with very encouraging results.
2020-01-13
Gopaluni, Jitendra, Unwala, Ishaq, Lu, Jiang, Yang, Xiaokun.  2019.  Graphical User Interface for OpenThread. 2019 IEEE 16th International Conference on Smart Cities: Improving Quality of Life Using ICT IoT and AI (HONET-ICT). :235–237.
This paper presents an implementation of a Graphical User Interface (GUI) for the OpenThread software. OpenThread is a software package for Thread. Thread is a networking protocol for Internet of Things (IoT) designed for home automation. OpenThread package was released by Nest Labs as an open source implementation of the Thread specification v1.1.1. The OpenThread includes IPv6, 6LoWPAN, IEEE 802.15.4 with MAC security, Mesh Link Establishment, and Mesh Routing. OpenThread includes all Thread supported device types and supports both SOC and NCP implementations. OpenThread runs on Linux and allows the users to use it as a simulator with a command line interface. This research is focused on adding a Graphical User Interface (GUI) to the OpenThread. The GUI package is implemented in TCL/Tk (Tool Control Language). OpenThread with a GUI makes working with OpenThread much easier for researchers and students. The GUI also makes it easier to visualize the Thread network and its operations.
2020-03-27
Richter, Michael, Mehlmann, Gert, Luther, Matthias.  2019.  Grid Code Compliant Modeling and Control of Modular Multilevel Converters during Unbalanced Faults. 2019 54th International Universities Power Engineering Conference (UPEC). :1–6.
This paper presents necessary modeling and control enhancements for Modular Multilevel Converters (MMC) to provide Fault-Ride-Through capability and fast fault current injection as required by the new German Technical Connection Rules for HVDC. HVDC converters have to be able to detect and control the grid voltage and grid currents accurately during all fault conditions. That applies to the positive as well as negative sequence components, hence a Decoupled Double Synchronous Reference Frame - Phase-Locked-Loop (DDSRF-PLL) and Current Control (DDSRF-CC) are implemented. In addition, an enhanced current limitation and an extension of the horizontal balancing control are proposed to complement the control structure for safe operation.
2020-01-27
Lundberg, Lars, Lennerstad, Håkan, Boeva, Veselka, García-Martín, Eva.  2019.  Handling Non-linear Relations in Support Vector Machines through Hyperplane Folding. Proceedings of the 2019 11th International Conference on Machine Learning and Computing. :137–141.
We present a new method, called hyperplane folding, that increases the margin in Support Vector Machines (SVMs). Based on the location of the support vectors, the method splits the dataset into two parts, rotates one part of the dataset and then merges the two parts again. This procedure increases the margin as long as the margin is smaller than half of the shortest distance between any pair of data points from the two different classes. We provide an algorithm for the general case with n-dimensional data points. A small experiment with three folding iterations on 3-dimensional data points with non-linear relations shows that the margin does indeed increase and that the accuracy improves with a larger margin. The method can use any standard SVM implementation plus some basic manipulation of the data points, i.e., splitting, rotating and merging. Hyperplane folding also increases the interpretability of the data.
2020-02-10
Hu, Taifeng, Wu, Liji, Zhang, Xiangmin, Yin, Yanzhao, Yang, Yijun.  2019.  Hardware Trojan Detection Combine with Machine Learning: an SVM-based Detection Approach. 2019 IEEE 13th International Conference on Anti-counterfeiting, Security, and Identification (ASID). :202–206.
With the application of integrated circuits (ICs) appears in all aspects of life, whether an IC is security and reliable has caused increasing worry which is of significant necessity. An attacker can achieve the malicious purpose by adding or removing some modules, so called hardware Trojans (HTs). In this paper, we use side-channel analysis (SCA) and support vector machine (SVM) classifier to determine whether there is a Trojan in the circuit. We use SAKURA-G circuit board with Xilinx SPARTAN-6 to complete our experiment. Results show that the Trojan detection rate is up to 93% and the classification accuracy is up to 91.8475%.
2020-05-22
Markchit, Sarawut, Chiu, Chih-Yi.  2019.  Hash Code Indexing in Cross-Modal Retrieval. 2019 International Conference on Content-Based Multimedia Indexing (CBMI). :1—4.
Cross-modal hashing, which searches nearest neighbors across different modalities in the Hamming space, has become a popular technique to overcome the storage and computation barrier in multimedia retrieval recently. Although dozens of cross-modal hashing algorithms are proposed to yield compact binary code representation, applying exhaustive search in a large-scale dataset is impractical for the real-time purpose, and the Hamming distance computation suffers inaccurate results. In this paper, we propose a novel index scheme over binary hash codes in cross-modal retrieval. The proposed indexing scheme exploits a few binary bits of the hash code as the index code. Based on the index code representation, we construct an inverted index structure to accelerate the retrieval efficiency and train a neural network to improve the indexing accuracy. Experiments are performed on two benchmark datasets for retrieval across image and text modalities, where hash codes are generated by three cross-modal hashing methods. Results show the proposed method effectively boosts the performance over the benchmark datasets and hash methods.
2020-03-27
Cabrini, Fábio H., de Barros Castro Filho, Albérico, Filho, Filippo V., Kofuji, Sergio T., Moura, Angelo Rafael Lunardelli Pucci.  2019.  Helix SandBox: An Open Platform to Fast Prototype Smart Environments Applications. 2019 IEEE 1st Sustainable Cities Latin America Conference (SCLA). :1–6.
This paper presents the Helix SandBox, an open platform for quick prototyping of smart environment applications. Its architecture was designed to be a lightweight solution that aimed to simplify the instance integration and setup of the main Generic Enablers provided in the FIWARE architecture. As a Powered by FIWARE platform, the SandBox operates with the NGSI standard for interoperability between systems. The platform offers a container-based multicloud architecture capable of running in public, private and bare metal clouds or even in the leading hypervisors available. This paper also proposes a multi-layered architecture capable of integrates the cloud, fog, edge and IoT layers through the federation concept. Lastly, we present two Smart Cities applications conducted in the form of Proof of Concept (PoC) that use the Helix SandBox platform as back-end.
2020-03-09
Gregory, Jason M., Al-Hussaini, Sarah, Gupta, Satyandra K..  2019.  Heuristics-Based Multi-Agent Task Allocation for Resilient Operations. 2019 IEEE International Symposium on Safety, Security, and Rescue Robotics (SSRR). :1–8.
Multi-Agent Task Allocation is a pre-requisite for many autonomous, real-world systems because of the need for intelligent task assignment amongst a team for maximum efficiency. Similarly, agent failure, task, failure, and a lack of state information are inherent challenges when operating in complex environments. Many existing solutions make simplifying assumptions regarding the modeling of these factors, e.g., Markovian state information. However, it is not clear that this is always the appropriate approach or that results from these approaches are necessarily representative of performance in the natural world. In this work, we demonstrate that there exists a class of problems for which non-Markovian state modeling is beneficial. Furthermore, we present and characterize a novel heuristic for task allocation that incorporates realistic state and uncertainty modeling in order to improve performance. Our quantitative analysis, when tested in a simulated search and rescue (SAR) mission, shows a decrease in performance of more than 57% when a representative method with Markovian assumptions is tested in a non-Markovian setting. Our novel heuristic has shown an improvement in performance of 3-15%, in the same non-Markovian setting, by modeling probabilistic failure and making fewer assumptions.