Anca Ralescu | University of Cincinnati (original) (raw)

Papers by Anca Ralescu

Journal of Advanced Transportation, Feb 23, 2022

e development of Information and Communication Technologies (ICT) has now reached some entirely u... more e development of Information and Communication Technologies (ICT) has now reached some entirely unexpected domains. Many applications in modern cities lead to novelties, resulting in new habits of the citizens of tomorrow's smart cities. ese innovations include Intelligent Transportation Systems (ITS). An important application domain of ITS is undoubtedly represented by the dynamic and optimized management of traffic-lighted road intersections. Although several works have already been presented in the literature over the years, many have not considered the new perspectives regarding the source of data to manage traffic lights, i.e., not only Wireless Sensor Networks (WSNs), but, mainly, the vehicular communications. is paper introduces an innovative approach to dynamically regulating traffic light cycles and phases in an isolated intersection. e suggested method can fit data management from WSNs and vehicular communications through IEEE 802.11p and LTE-V2V, employing various Fuzzy Logic Controllers (FLCs) that manage vehicles turning movements for dynamic controls of both the phase and the green time of traffic lights. e results obtained will allow us to observe that the proposed application is better than the others. Each of the implemented configurations will bring advantages and disadvantages that allow choosing one configuration or another based on specific project requirements.

Advances in Artificial Intelligence and Machine Learning, 2022

An important step in designing a fuzzy system is the elicitation of the membership functions for ... more An important step in designing a fuzzy system is the elicitation of the membership functions for the fuzzy sets used. Often the membership functions are obtained from data in a traininglike manner. They are expected to match or be at least compatible with those obtained from experts knowledgeable of the domain and the problem being addressed. In cases when neither are possible, e.g., insufficient data or unavailability of experts, we are faced with the question of hypothesizing the membership function. We have previously argued in favor of Cauchy membership functions (thus named because their expression is similar to that of the Cauchy distributions) and supported this choice from the point of view of efficiency of training. This paper looks at the same family of membership functions from the point of view of reliability.

Abstract--The design of a classifier usually has the important step of attribute or feature selec... more Abstract--The design of a classifier usually has the important step of attribute or feature selection. A computationally tractable scheme almost always relies on a subset of attributes that optimize a certain criterion is chosen, resulting in a good sub-optimal solution. We show ...

Communications in computer and information science, 2021

Fuzzy Sets and Systems, Sep 1, 2020

Timetable scheduling for public transit seeks to optimize service quality and utilization of limi... more Timetable scheduling for public transit seeks to optimize service quality and utilization of limited resources. A new method is proposed to find a sequence of time intervals adjusted to the dynamic passenger flow in a fuzzy environment with improved reverse-flow. The decision making is based on two fuzzy variables-passenger satisfaction and vehicle capacity usage. Compared with the original timetable, the optimized timetable can adjust to the varying passenger flow, while balancing passenger satisfaction and vehicle load, and it is optimized for any service time span. A practical implementation is provided on a case study of three bus lines for which timetables are designed and discussed in varying situations.

Kluwer Academic eBooks, 1994

Preface. 1: Future Vision of Fuzzy Engineering T. Terano. 2: Decision Support System S. Fukami, M... more Preface. 1: Future Vision of Fuzzy Engineering T. Terano. 2: Decision Support System S. Fukami, M. Yoneda. 3: Intelligent Plant Operation Support M. Yoneda, H. Tsunekawa. 4: Fuzzy Modeling and Process Control System Design K. Suzuki. 5: Inference Function for Understanding Linguistic Instructions T. Yokogawa. 6: Fuzzy Theory in an Image Understanding Retrieval System T. Norita. 7: Research into Intelligent Behavior Decision Making of Robots Y. Maeda. 8: Fuzzy Neural Net System T. Yamaguchi, K. Goto, T. Takagi. 9: Fuzzy Expert System Shell -- LIFE FEShell S. Tano. 10: The Fuzzy Computer H. Tokunaga, S. Yasunobu. Subject Index.

Springer eBooks, Sep 30, 2022

Fuzzy Optimization and Decision Making, Sep 19, 2018

The objective of designing timetables for public transportation is twofold: to ensure an efficien... more The objective of designing timetables for public transportation is twofold: to ensure an efficient use of limited resources and to provide a comfortable ride for passengers. Two models for timetable optimization are investigated in this study. Model 1 uses a crisp constraint on the rate of vehicle capacity usage. Model 2 improves on model 1 by translating the crisp constraint into a fuzzy goal representing passenger satisfaction, and a fuzzy constraint, representing the extent of vehicle usage. Both, the fuzzy goal and the fuzzy constraint, are fuzzy sets on the number of on-board passengers. Heuristic methods together with linear programming are proposed for finding the optimal headway. Model 1 selects the largest time interval under the bound on vehicle size. The set of optimal time intervals in model 2 is decided by the simultaneous level cuts of the fuzzy goal and constraint. Experimental results show that fuzzy-set based model 2 is the most flexible and effective way to generate an optimal timetable.

HAL (Le Centre pour la Communication Scientifique Directe), 2015

Attention, in particular visual attention, has been a subject of studies in various disciplines, ... more Attention, in particular visual attention, has been a subject of studies in various disciplines, including cognitive science, experimental psychology, and computer vision. In cognitive science and experimental psychology the objective is to develop theories that can explain the attention phenomenon of cognition. In computer vision, the objective is to inform image understanding systems by hypotheses on the human visual attention. There is, however, very little influence of studies across these two disciplines. In a departure from this state of affairs, this study seeks to develop an algorithmic approach to visual attention as part of an image understanding system, by starting with a theory of visual attention put forward in experimental psychology. In the process, it will become useful to revise some of the concepts of this theory, in particular by adopting fuzzy set based representations and the necessary calculus for them.

Springer eBooks, Sep 1, 1994

Proceedings of SPIE, Mar 28, 1995

ABSTRACT

Complex engineering systems, 2022

We propose an algorithm for n-dimensional regression problems with continuous variables. Its main... more We propose an algorithm for n-dimensional regression problems with continuous variables. Its main property is explainability, which we identify as the ability to understand the algorithm’s decisions from a human perspective. This has been achieved thanks to the simplicity of the architecture, the lack of hidden layers (as opposed to deep neural networks used for this same task) and the linguistic nature of its fuzzy inference system. First, the algorithm divides the joint input-output space into clusters that are subsequently approximated using linear functions. Then, we fit a Cauchy membership function to each cluster, therefore identifying them as fuzzy sets. The prediction of each linear regression is merged using a Takagi-Sugeno-Kang approach to generate the prediction of the model. Finally, the parameters of the algorithm (those from the linear functions and Cauchy membership functions) are fine-tuned using Gradient Descent optimization. In order to validate this algorithm, we considered three different scenarios: The first two are simple one-input and two-input problems with artificial data, which allow visual inspection of the results. In the third scenario we use real data for the prediction of the power generated by a Combined Cycle Power Plant. The results obtained in this last problem (3.513 RMSE and 2.649 MAE) outperform the state of the art (3.787 RMSE and 2.818 MAE).

International Journal of Advanced Intelligence Paradigms, 2014

The dynamic P300-based speller adjusts the number of flashes per character according to the chara... more The dynamic P300-based speller adjusts the number of flashes per character according to the character's probability of occurrence, as predicted by a language model. The speller consists of two modules: the modified P300 speller using a row-column paradigm, and the prediction by partial matching (PPM) language module. Two cases are considered, prediction hit and prediction miss, according to whether the character predicted by the model coincides with the character intended by the subject. Preliminary experimental results point to the possible advantages of the modified P300 speller which reduces total flash time, while preserving performance.

Fuzzy Sets and Systems, May 1, 1993

Abstract The 'ideal'solution of a learning problem is discussed. Our learning problem i... more Abstract The 'ideal'solution of a learning problem is discussed. Our learning problem is that of finding p in p→ q with a given data sequence of q, written as {qi, I= 1, 2,..., N}. Based on the concept of Zadeh's 'relative sigma-count', we formulate the problem as a multi-...

ABSTRACT Hybrid intelligent systems play an important role in the survival prediction of breast c... more ABSTRACT Hybrid intelligent systems play an important role in the survival prediction of breast cancer. The life-expectancy prediction of a patient is highly significant in decision making for treatments, medications and therapies. This paper addresses the motivation behind the need of hybrid model approach to survival prediction for breast cancer. The conventional approach of survival prediction faces difficulties in handling complex non-linear correlation between the prognostic factors and tumor progression, the censoring issue in medical data and the need to process the growing number of macro-scale and molecular-scale prognostic factors. The issues in breast cancer survivability are discussed with some examples of prominent works from machine learning approaches. Current trends and advancements of hybrid intelligent system are also presented.

Evolvable hardware is attractive as a design strategy to hardware engineers, but suffers due to i... more Evolvable hardware is attractive as a design strategy to hardware engineers, but suffers due to its lack of scalability to larger hardware systems. This work examines how hardware designers can make use of evolvable hardware to improve the security of their systems, and to create hardware systems that are better resistant to reverse engineering.

Journal of Japan Society for Fuzzy Theory and Systems, Aug 15, 1995

different from each other, share the same goal, namely identification in the sense described above.

Lecture Notes in Computer Science, 2003

Bibliographic information published by Die Deutsche Bibliothek Die Deutsche Bibliothek lists this... more Bibliographic information published by Die Deutsche Bibliothek Die Deutsche Bibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data is available in the Internet at <http://dnb.ddb.de>.

International series in intelligent technologies, 1994

Applied research in fuzzy technology : three years of research at the Laboratory for Internationa... more Applied research in fuzzy technology : three years of research at the Laboratory for International Fuzzy Engineering (LIFE) , Yokohama, Japan / edited by Anca L. Ralescu. p. cm.-(International series in intelligent technologies) Includes bibliographical references and index.