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Nowadays, REpresentational State Transfer Application Programming Interfaces (REST APIs) are widely used in web applications, hence a plethora of test cases are developed to validate the APIs calls. We propose a solution that automates the generation of test cases for REST APIs based on their specifications. In our approach, apart from the automatic generation of test cases, we provide an option for the user to influence the test case generation process. By adding user interaction, we aim to augment the automatic generation of APIs test cases with human testing expertise and specific context. We use the latest version of OpenAPI 3.x and a wide range of coverage metrics to analyze the functionality and performance of the generated test cases, and non-functional metrics to analyze the performance of the APIs. The experiments proved the effectiveness and practicability of our method.
Ovidiu BaniaČ™; Diana Florea; Robert Gyalai; Daniel-Ioan Curiac. Automated Specification-Based Testing of REST APIs. Sensors 2021, 21, 5375 .
AMA StyleOvidiu BaniaČ™, Diana Florea, Robert Gyalai, Daniel-Ioan Curiac. Automated Specification-Based Testing of REST APIs. Sensors. 2021; 21 (16):5375.
Chicago/Turabian StyleOvidiu BaniaČ™; Diana Florea; Robert Gyalai; Daniel-Ioan Curiac. 2021. "Automated Specification-Based Testing of REST APIs." Sensors 21, no. 16: 5375.
In mixed criticality systems (MCSs), the time-triggered scheduling approach focuses on a special case of safety-critical embedded applications which run in a time-triggered environment. Sometimes, for these types of MCSs, perfectly periodical (i.e., jitterless) scheduling for certain critical tasks is needed. In this paper, we propose FENP_MC (Fixed Execution Non-Preemptive Mixed Criticality), a real-time, table-driven, non-preemptive scheduling method specifically adapted to mixed criticality systems which guarantees jitterless execution in a mixed criticality time-triggered environment. We also provide a multiprocessor version, namely, P_FENP_MC (Partitioned Fixed Execution Non-Preemptive Mixed Criticality), using a partitioning heuristic. Feasibility tests are proposed for both uniprocessor and homogenous multiprocessor systems. An analysis of the algorithm performance is presented in terms of success ratio and scheduling jitter by comparing it against a time-triggered and an event-driven method in a non-preemptive context.
Eugenia Ana Capota; Cristina Sorina Stangaciu; Mihai Victor Micea; Daniel-Ioan Curiac. Towards Fully Jitterless Applications: Periodic Scheduling in Multiprocessor MCSs Using a Table-Driven Approach. Applied Sciences 2020, 10, 6702 .
AMA StyleEugenia Ana Capota, Cristina Sorina Stangaciu, Mihai Victor Micea, Daniel-Ioan Curiac. Towards Fully Jitterless Applications: Periodic Scheduling in Multiprocessor MCSs Using a Table-Driven Approach. Applied Sciences. 2020; 10 (19):6702.
Chicago/Turabian StyleEugenia Ana Capota; Cristina Sorina Stangaciu; Mihai Victor Micea; Daniel-Ioan Curiac. 2020. "Towards Fully Jitterless Applications: Periodic Scheduling in Multiprocessor MCSs Using a Table-Driven Approach." Applied Sciences 10, no. 19: 6702.
Cyber Physical Systems (CPSs) are a fast-evolving technology based on a strong synergy between heterogeneous sensing, networking, computation and control modules. When coping with critical applications that require real-time performance and autonomous operation in uncertain conditions, the design of such complex systems is still facing significant difficulties. A particular challenge in this respect derives from the software intensive nature of these systems - the need to develop flexible and specifically tailored task scheduling techniques. In our view, an appropriate line of thinking is to take advantage of mixed criticality concepts following the lessons learned from avionics and automotive domains, where complexity, safety, determinism and real-time constraints are extreme. From this perspective, our work aims at facilitating the integration of mixed criticality systems-based strategy in cyber physical systems by identifying the particularities of the latter and their influence on scheduling mechanisms, by describing the standard mixed-criticality task model in the cyber physical systems context, and by analyzing and proposing the most suitable scheduling algorithms to be implemented in cyber physical systems. Moreover, the perspectives on future developments in this area are discussed, as new horizons in research arise with the integration of mixed criticality concepts in the cyber physical systems context.
Eugenia Ana Capota; Cristina Sorina Stangaciu; Mihai Victor Micea; Daniel-Ioan Curiac. Towards mixed criticality task scheduling in cyber physical systems: Challenges and perspectives. Journal of Systems and Software 2019, 156, 204 -216.
AMA StyleEugenia Ana Capota, Cristina Sorina Stangaciu, Mihai Victor Micea, Daniel-Ioan Curiac. Towards mixed criticality task scheduling in cyber physical systems: Challenges and perspectives. Journal of Systems and Software. 2019; 156 ():204-216.
Chicago/Turabian StyleEugenia Ana Capota; Cristina Sorina Stangaciu; Mihai Victor Micea; Daniel-Ioan Curiac. 2019. "Towards mixed criticality task scheduling in cyber physical systems: Challenges and perspectives." Journal of Systems and Software 156, no. : 204-216.
Daniel-Ioan Curiac; Florin Dragan; Ovidiu Banias; Daniel Iercan. A knowledge based system approach in securing distributed wireless sensor networks. 2018, 1 .
AMA StyleDaniel-Ioan Curiac, Florin Dragan, Ovidiu Banias, Daniel Iercan. A knowledge based system approach in securing distributed wireless sensor networks. . 2018; ():1.
Chicago/Turabian StyleDaniel-Ioan Curiac; Florin Dragan; Ovidiu Banias; Daniel Iercan. 2018. "A knowledge based system approach in securing distributed wireless sensor networks." , no. : 1.
Ovidiu Banias; Daniel-Ioan Curiac; Radu-Emil Precup. Sensor Networks Architecture for Vehicles and Pedestrians Traffic Control. 2018, 1 .
AMA StyleOvidiu Banias, Daniel-Ioan Curiac, Radu-Emil Precup. Sensor Networks Architecture for Vehicles and Pedestrians Traffic Control. . 2018; ():1.
Chicago/Turabian StyleOvidiu Banias; Daniel-Ioan Curiac; Radu-Emil Precup. 2018. "Sensor Networks Architecture for Vehicles and Pedestrians Traffic Control." , no. : 1.
Daniel-Ioan Curiac; Ovidiu Banias; Ioan Borza. Structural health monitoring with distributed wireless sensor networks. 2018, 1 .
AMA StyleDaniel-Ioan Curiac, Ovidiu Banias, Ioan Borza. Structural health monitoring with distributed wireless sensor networks. . 2018; ():1.
Chicago/Turabian StyleDaniel-Ioan Curiac; Ovidiu Banias; Ioan Borza. 2018. "Structural health monitoring with distributed wireless sensor networks." , no. : 1.
Living organisms have developed and optimized ingenious defense strategies based on positional entropy. One of the most significant examples in this respect is known as protean behavior, where a prey animal under threat performs unpredictable zig-zag movements in order to confuse, delay or escape the predator. This kind of defensive behavior can inspire efficient strategies for patrolling robots evolving in the presence of adversaries. The main goal of our proposed bioinspired method is to implement the protean behavior by altering the reference path of the robot with sudden and erratic direction changes without endangering the robot’s overall mission. By this, a foe intending to target and destroy the mobile robot from a distance has less time for acquiring and retaining the proper sight alignment. The method uses the chaotic dynamics of the 2D Arnold’s cat map as a primary source of positional entropy and transfers this feature to every reference path segment using the kinematic relative motion concept. The effectiveness of this novel biologically inspired method is validated through extensive and realistic simulation case studies.
Daniel-Ioan Curiac; Ovidiu Banias; Constantin Volosencu; Christian-Daniel Curiac. Novel Bioinspired Approach Based on Chaotic Dynamics for Robot Patrolling Missions with Adversaries. Entropy 2018, 20, 378 .
AMA StyleDaniel-Ioan Curiac, Ovidiu Banias, Constantin Volosencu, Christian-Daniel Curiac. Novel Bioinspired Approach Based on Chaotic Dynamics for Robot Patrolling Missions with Adversaries. Entropy. 2018; 20 (5):378.
Chicago/Turabian StyleDaniel-Ioan Curiac; Ovidiu Banias; Constantin Volosencu; Christian-Daniel Curiac. 2018. "Novel Bioinspired Approach Based on Chaotic Dynamics for Robot Patrolling Missions with Adversaries." Entropy 20, no. 5: 378.
Sensor networks become increasingly a key technology for complex control applications. Their potential use in safety- and time-critical domains has raised the need for task scheduling mechanisms specially adapted to sensor node specific requirements, often materialized in predictable jitter-less execution of tasks characterized by different criticality levels. This paper offers an efficient scheduling solution, named Hybrid Hard Real-Time Scheduling (H2RTS), which combines a static, clock driven method with a dynamic, event driven scheduling technique, in order to provide high execution predictability, while keeping a high node Central Processing Unit (CPU) utilization factor. From the detailed, integrated schedulability analysis of the H2RTS, a set of sufficiency tests are introduced and demonstrated based on the processor demand and linear upper bound metrics. The performance and correct behavior of the proposed hybrid scheduling technique have been extensively evaluated and validated both on a simulator and on a sensor mote equipped with ARM7 microcontroller.
Mihai-Victor Micea; Cristina-Sorina Stangaciu; Valentin Stangaciu; Daniel-Ioan Curiac. Novel Hybrid Scheduling Technique for Sensor Nodes with Mixed Criticality Tasks. Sensors 2017, 17, 1504 .
AMA StyleMihai-Victor Micea, Cristina-Sorina Stangaciu, Valentin Stangaciu, Daniel-Ioan Curiac. Novel Hybrid Scheduling Technique for Sensor Nodes with Mixed Criticality Tasks. Sensors. 2017; 17 (7):1504.
Chicago/Turabian StyleMihai-Victor Micea; Cristina-Sorina Stangaciu; Valentin Stangaciu; Daniel-Ioan Curiac. 2017. "Novel Hybrid Scheduling Technique for Sensor Nodes with Mixed Criticality Tasks." Sensors 17, no. 7: 1504.
Constructing chaotic systems tailored for each particular real-world application has been a long-term research desideratum. We report a solution for this problem based on the concept of relative motion. We investigate the periodic motion on a closed contour of a coordinate frame in which a chaotic system evolves. By combining these two motions (periodic on a close contour and chaotic) new customized shape trajectories are acquired. We demonstrate that these trajectories obtained in the stationary frame are also chaotic and, moreover, conserve the Lyapunov exponents of the initial chaotic system. Based on this finding we developed an innovative method to construct new chaotic systems with customized shapes, thus fulfilling the requirements of any particular application of chaos.
Daniel-Ioan Curiac; Constantin Volosencu. A generic method to construct new customized-shaped haotic systems using the relative motion concept. Nonlinear Analysis: Modelling and Control 2016, 21, 413 -423.
AMA StyleDaniel-Ioan Curiac, Constantin Volosencu. A generic method to construct new customized-shaped haotic systems using the relative motion concept. Nonlinear Analysis: Modelling and Control. 2016; 21 (3):413-423.
Chicago/Turabian StyleDaniel-Ioan Curiac; Constantin Volosencu. 2016. "A generic method to construct new customized-shaped haotic systems using the relative motion concept." Nonlinear Analysis: Modelling and Control 21, no. 3: 413-423.
Being often deployed in remote or hostile environments, wireless sensor networks are vulnerable to various types of security attacks. A possible solution to reduce the security risks is to use directional antennas instead of omnidirectional ones or in conjunction with them. Due to their increased complexity, higher costs and larger sizes, directional antennas are not traditionally used in wireless sensor networks, but recent technology trends may support this method. This paper surveys existing state of the art approaches in the field, offering a broad perspective of the future use of directional antennas in mitigating security risks, together with new challenges and open research issues.
Daniel-Ioan Curiac. Wireless Sensor Network Security Enhancement Using Directional Antennas: State of the Art and Research Challenges. Sensors 2016, 16, 488 .
AMA StyleDaniel-Ioan Curiac. Wireless Sensor Network Security Enhancement Using Directional Antennas: State of the Art and Research Challenges. Sensors. 2016; 16 (4):488.
Chicago/Turabian StyleDaniel-Ioan Curiac. 2016. "Wireless Sensor Network Security Enhancement Using Directional Antennas: State of the Art and Research Challenges." Sensors 16, no. 4: 488.
Daniel-Ioan Curiac. Towards wireless sensor, actuator and robot networks: Conceptual framework, challenges and perspectives. Journal of Network and Computer Applications 2016, 63, 14 -23.
AMA StyleDaniel-Ioan Curiac. Towards wireless sensor, actuator and robot networks: Conceptual framework, challenges and perspectives. Journal of Network and Computer Applications. 2016; 63 ():14-23.
Chicago/Turabian StyleDaniel-Ioan Curiac. 2016. "Towards wireless sensor, actuator and robot networks: Conceptual framework, challenges and perspectives." Journal of Network and Computer Applications 63, no. : 14-23.
This chapter presents the main challenges in developing complex systems built around the core concept of Video-Based Wireless Sensor Networks. It summarizes some innovative solutions proposed in scientific literature on this field. Besides discussion on various issues related to such systems, the authors focus on two crucial aspects: video data processing and data exchange. A special attention is paid to localization algorithms in case of random deployment of nodes having no specific localization hardware installed. Solutions for data exchange are presented by highlighting the data compression and communication efficiency in terms of energy saving. In the end, some open research topics related with Video-Based Wireless Sensor Networks are identified and explained.
Dan Pescaru; Daniel-Ioan Curiac. Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks. Mobile Computing and Wireless Networks 2016, 1986 -2005.
AMA StyleDan Pescaru, Daniel-Ioan Curiac. Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks. Mobile Computing and Wireless Networks. 2016; ():1986-2005.
Chicago/Turabian StyleDan Pescaru; Daniel-Ioan Curiac. 2016. "Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks." Mobile Computing and Wireless Networks , no. : 1986-2005.
During their task accomplishment, autonomous unmanned aerial vehicles are facing more and more threats coming from both ground and air. In such adversarial environments, with no a priori information about the threats, a flying robot in charge with surveilling a specified 3D sector must perform its tasks by evolving on misleading and unpredictable trajectories to cope with enemy entities. In our view, the chaotic dynamics can be the cornerstone in designing unpredictable paths for such missions, even though this solution was not exploited until now by researchers in the 3D context. This paper addresses the flight path-planning issue for surveilling a given volume in adversarial conditions by proposing a proficient approach that uses the chaotic behaviour exhibited by the 3D Arnold’s cat map. By knowing the exact location of the volume under surveillance before take-off, the flying robot will generate the successive chaotic waypoints only with onboard resources, in an efficient manner. The method is validated by simulation in a realistic scenario using a detailed Simulink model for the X-4 Flyer quadcopter.
Daniel-Ioan Curiac; Constantin Volosencu. Path Planning Algorithm based on Arnold Cat Map for Surveillance UAVs. Defence Science Journal 2015, 65, 483 -488.
AMA StyleDaniel-Ioan Curiac, Constantin Volosencu. Path Planning Algorithm based on Arnold Cat Map for Surveillance UAVs. Defence Science Journal. 2015; 65 (6):483-488.
Chicago/Turabian StyleDaniel-Ioan Curiac; Constantin Volosencu. 2015. "Path Planning Algorithm based on Arnold Cat Map for Surveillance UAVs." Defence Science Journal 65, no. 6: 483-488.
Providing unpredictable trajectories for patrol robots is essential when coping with adversaries. In order to solve this problem we developed an effective approach based on the known protean behavior of individual prey animals-random zig-zag movement. The proposed bio-inspired method modifies the normal robot's path by incorporating sudden and irregular direction changes without jeopardizing the robot's mission. Such a tactic is aimed to confuse the enemy (e.g. a sniper), offering less time to acquire and retain sight alignment and sight picture. This idea is implemented by simulating a series of fictive-temporary obstacles that will randomly appear in the robot's field of view, deceiving the obstacle avoiding mechanism to react. The new general methodology is particularized by using the Arnold's cat map to obtain the timely random appearance and disappearance of the fictive obstacles. The viability of the proposed method is confirmed through an extensive simulation case study.
Daniel-Ioan Curiac; Constantin Volosencu. Imparting protean behavior to mobile robots accomplishing patrolling tasks in the presence of adversaries. Bioinspiration & Biomimetics 2015, 10, 56017 .
AMA StyleDaniel-Ioan Curiac, Constantin Volosencu. Imparting protean behavior to mobile robots accomplishing patrolling tasks in the presence of adversaries. Bioinspiration & Biomimetics. 2015; 10 (5):56017.
Chicago/Turabian StyleDaniel-Ioan Curiac; Constantin Volosencu. 2015. "Imparting protean behavior to mobile robots accomplishing patrolling tasks in the presence of adversaries." Bioinspiration & Biomimetics 10, no. 5: 56017.
Daniel-Ioan Curiac; Constantin Volosencu. A 2D chaotic path planning for mobile robots accomplishing boundary surveillance missions in adversarial conditions. Communications in Nonlinear Science and Numerical Simulation 2014, 19, 3617 -3627.
AMA StyleDaniel-Ioan Curiac, Constantin Volosencu. A 2D chaotic path planning for mobile robots accomplishing boundary surveillance missions in adversarial conditions. Communications in Nonlinear Science and Numerical Simulation. 2014; 19 (10):3617-3627.
Chicago/Turabian StyleDaniel-Ioan Curiac; Constantin Volosencu. 2014. "A 2D chaotic path planning for mobile robots accomplishing boundary surveillance missions in adversarial conditions." Communications in Nonlinear Science and Numerical Simulation 19, no. 10: 3617-3627.
Rapid advances in computing, sensing and telecommunication technology offer unprecedented opportunities for artificial intelligence concepts to expand their applications in the field of traffic management and control. Our methodology gravitates around a powerful decision-making method: ensemble-based systems. This technique is used to accurately classify the near future traffic conditions and to make efficient decisions for adapting the traffic lights sequences within an urban area to optimize the traffic flows. The proposed approach requires only measurements provided by traffic sensors located along the principal roads entering the zone. This reduced number of sensors are considered to be enough relevant for classifying the near future state of the traffic and moreover, their measurements can be validated through analytical/hardware redundancy. Our methodology is meant to be implemented within the framework of a wireless sensor and actuator network and is confirmed by computer simulation, including normal or abnormal traffic conditions, for the central part of the city of Timisoara-Romania.
Dan Pescaru; Daniel-Ioan Curiac. Ensemble based traffic light control for city zones using a reduced number of sensors. Transportation Research Part C: Emerging Technologies 2014, 46, 261 -273.
AMA StyleDan Pescaru, Daniel-Ioan Curiac. Ensemble based traffic light control for city zones using a reduced number of sensors. Transportation Research Part C: Emerging Technologies. 2014; 46 ():261-273.
Chicago/Turabian StyleDan Pescaru; Daniel-Ioan Curiac. 2014. "Ensemble based traffic light control for city zones using a reduced number of sensors." Transportation Research Part C: Emerging Technologies 46, no. : 261-273.
Distributed sensing, computing and communication capabilities of wireless sensor networks require, in most situations, an efficient node localization procedure. In the case of random deployments in harsh or hostile environments, a general localization process within global coordinates is based on a set of anchor nodes able to determine their own position using GPS receivers. In this paper we propose another anchor node localization technique that can be used when GPS devices cannot accomplish their mission or are considered to be too expensive. This novel technique is based on the fusion of video and compass data acquired by the anchor nodes and is especially suitable for video- or multimedia-based wireless sensor networks. For these types of wireless networks the presence of video cameras is intrinsic, while the presence of digital compasses is also required for identifying the cameras’ orientations.
Dan Pescaru; Daniel-Ioan Curiac. Anchor Node Localization for Wireless Sensor Networks Using Video and Compass Information Fusion. Sensors 2014, 14, 4211 -4224.
AMA StyleDan Pescaru, Daniel-Ioan Curiac. Anchor Node Localization for Wireless Sensor Networks Using Video and Compass Information Fusion. Sensors. 2014; 14 (3):4211-4224.
Chicago/Turabian StyleDan Pescaru; Daniel-Ioan Curiac. 2014. "Anchor Node Localization for Wireless Sensor Networks Using Video and Compass Information Fusion." Sensors 14, no. 3: 4211-4224.
This chapter presents the main challenges in developing complex systems built around the core concept of Video-Based Wireless Sensor Networks. It summarizes some innovative solutions proposed in scientific literature on this field. Besides discussion on various issues related to such systems, the authors focus on two crucial aspects: video data processing and data exchange. A special attention is paid to localization algorithms in case of random deployment of nodes having no specific localization hardware installed. Solutions for data exchange are presented by highlighting the data compression and communication efficiency in terms of energy saving. In the end, some open research topics related with Video-Based Wireless Sensor Networks are identified and explained.
Dan Pescaru; Daniel-Ioan Curiac. Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks. Design Methodologies and Tools for 5G Network Development and Application 2014, 196 -215.
AMA StyleDan Pescaru, Daniel-Ioan Curiac. Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks. Design Methodologies and Tools for 5G Network Development and Application. 2014; ():196-215.
Chicago/Turabian StyleDan Pescaru; Daniel-Ioan Curiac. 2014. "Data Processing and Exchange Challenges in Video-Based Wireless Sensor Networks." Design Methodologies and Tools for 5G Network Development and Application , no. : 196-215.
Information security represents the cornerstone of every data processing system that resides in an organisation's trusted network, implementing all necessary protocols, mechanisms and policies to be one step ahead of possible threats. Starting from the need to strengthen the set of security services, in this article we introduce a new and innovative process named controlled information destruction (CID) that is meant to secure sensitive data that are no longer needed for the organisation's future purposes but would be very damaging if revealed. The disposal of this type of data has to be controlled carefully in order to delete not only the information itself but also all its splinters spread throughout the network, thus denying any possibility of recovering the information after its alleged destruction. This process leads to a modified model of information assurance and also reconfigures the architecture of any information security management system. The scheme we envisioned relies on a reshaped information lifecycle, which reveals the impact of the CID procedure directly upon the information states.
Daniel-Ioan Curiac; Mihai Pachia. Controlled information destruction: the final frontier in preserving information security for every organisation. Enterprise Information Systems 2013, 9, 384 -400.
AMA StyleDaniel-Ioan Curiac, Mihai Pachia. Controlled information destruction: the final frontier in preserving information security for every organisation. Enterprise Information Systems. 2013; 9 (4):384-400.
Chicago/Turabian StyleDaniel-Ioan Curiac; Mihai Pachia. 2013. "Controlled information destruction: the final frontier in preserving information security for every organisation." Enterprise Information Systems 9, no. 4: 384-400.
The design of unpredictable trajectories for autonomous patrol robots when accomplishing surveillance missions represents, in many situations, a key desideratum. Solutions to this problem had often been associated with chaotic dynamics. While for area surveillance missions, relevant techniques to produce chaotic motion had been reported, in the case of monitoring a number of precise locations no viable solutions had been proposed. The present paper covers this research gap by offering a complex methodology that involves a mixture of two types of chaotic trajectory segments, based on Lorenz and Chen systems, in obtaining unpredictable trajectories when an arbitrary number of specified locations have to be monitored. The developed path-planning strategy produces trajectories that can cope efficiently with dynamical degradation of chaos or with obstacle avoidance issues.
Daniel-Ioan Curiac; Constantin Volosencu. Chaotic Trajectory Design for Monitoring an Arbitrary Number of Specified Locations Using Points of Interest. Mathematical Problems in Engineering 2012, 2012, 1 -18.
AMA StyleDaniel-Ioan Curiac, Constantin Volosencu. Chaotic Trajectory Design for Monitoring an Arbitrary Number of Specified Locations Using Points of Interest. Mathematical Problems in Engineering. 2012; 2012 ():1-18.
Chicago/Turabian StyleDaniel-Ioan Curiac; Constantin Volosencu. 2012. "Chaotic Trajectory Design for Monitoring an Arbitrary Number of Specified Locations Using Points of Interest." Mathematical Problems in Engineering 2012, no. : 1-18.