Leo Ordinez

Modeling and Specifying Requirements for Cyber-Physical Systems

Cyber physical systems have to do with a strong interaction between the physical world and a computing system, which should be transparent to an external observer. In this paper, an approach for modeling and specifying requirements for these systems is presented. It is called 3D Approach and it is based on the well known 4 Variable Model. The proposed extension intends to tackle the particularities involved in the development of cyber-physical systems by a multidisciplinary team and consequently it emphasizes a practical and applied point of view. The 3D Approach came out as the result of systematizing lessons learned in the design of a biodigester, which allows the anaerobic digestion of biomass for the production of biogas.

Design Patterns for Cyber-Physical Systems: The Case of a Robotic Greenhouse

Cyber-physical systems (CPS) are a new discipline of research that involves electrical engineering, electronics, computer science, control and communications interacting with physical processes. This leads to a co-managed domain where both worlds (cyber and physical) must be taken into account to decide the actions to take. In this sense, this paper presents the design of a robotic greenhouse, which involves basically the greenhouse and a mobile robot interacting with the physical environment (collecting data and acting on plants). Thus, the main contribution is related to taking practical experience and generalize it by applying well-proven techniques to the development of CPS.

A behavior priority driven approach for resource reservation scheduling

In this paper a behavioral distinction of soft real-time tasks is introduced. The distinction is based on the behavior of the previous instance of each task and it is used to propose a scheduling algorithm. The algorithm, called BIDS, uses well-known server mechanisms with an extension to handle two priority queues within each server. The priority of a server is managed accordingly to the result that its associated task produce. Along with the formal presentation of the algorithm and the proofs of its properties some performance evaluations based on simulations are included.

Using open hardware in a harsh environment: A case study

This paper reports the experience of implementing a data logger for a diesel-electric locomotive using open hardware and software. The proposed system was designed for one of the main railway companies in Argentina under the requirement from the Government office for transport control security.

El enfoque de Cajas Negra y Blanca para la enseñanza de sistemas embebidos

This paper presents the experience of incorporating open hardware and open software paradigms to the microcontroller architecture and embedded systems course in the careers of Electronic Engineering and Computer Engineering. The traditional syllabus proposed in textbooks is changed and the use of Arduino platforms is incorporated in the first labs. The basis for this change comes from the “hands on learning” pedagogical paradigm that is partially implemented in the course.

A Clinically Assisted Collaborative System Architecture for Preventing Falls in Elderly People

Falls in older adults are not only frequent but also potentially disabling for them. Detecting and preventing these falls have an important impact in the life of the elderly people. This paper presents the architecture of a pervasive system designed to perform early detection of older adults in risk of falling or fell down. The system notifies the appropriate people or healthcare organizations in case of detecting a fall of the monitored person. This monitoring process produces minimum disruption in the life style of the elderly.

Estrategias de diseño basadas en patrones de un subsistema de movimiento para un robot pulverizador

The cyber physical systems (SCF) are a new field of knowledge, involving the electrical, electronics, computer engineering control and communications, and interact with physical processes. A key aspect in the development of cyber physical systems, modeling whole problem, the environment and the entities involved. In this paper the development of cyber- physical systems deepens from the point of view of design patterns, expanding its original definition to encompass aspects of the physical world, the software and hardware that comprise it. In particular, a standard for the design of a subsystem in a mobile robot motion is presented. The theoretical case is exemplified by the implementation of this model in a robot built to carry out fumigation in greenhouses, which was based on ROS (Robot Operating System).

Resource sharing in behavioral based scheduling

In this paper, two main contributions are presented. First, the Behavioral Importance Dual Priority Server (BIDS) reservation mechanism is extended to contemplate more than two importance levels. In fact, an integer-value function is used to postpone the reactivation of the server based on the last result obtained. Second, a resource contention algorithm for BIDS is presented. Although it may seem simple, the resource reservation paradigm may have certain anomalies while sharing resources. The proposal is an extension of the Stack Resource Policy which is formally proved.