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Dr. Omar Rojas
Universidad Panamericana. Facultad de Ciencias Económicas y Empresariales

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0 Machine Learning
0 Applied Mathematics and Optimization
0 Statistical Learning and Modeling
0 Time Series Analysis and Forecasting
0 Operations research and optimization

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Journal article
Published: 14 July 2021 in Entropy
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This paper presents a criterion, based on information theory, to measure the amount of average information provided by the sequences of outputs of the RC4 on the internal state. The test statistic used is the sum of the maximum plausible estimates of the entropies H(jt|zt), corresponding to the probability distributions P(jt|zt) of the sequences of random variables (jt)tT and (zt)tT, independent, but not identically distributed, where zt are the known values of the outputs, while jt is one of the unknown elements of the internal state of the RC4. It is experimentally demonstrated that the test statistic allows for determining the most vulnerable RC4 outputs, and it is proposed to be used as a vulnerability metric for each RC4 output sequence concerning the iterative probabilistic attack.

ACS Style

Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez. Information Theory Based Evaluation of the RC4 Stream Cipher Outputs. Entropy 2021, 23, 896 .

AMA Style

Evaristo Madarro-Capó, Carlos Legón-Pérez, Omar Rojas, Guillermo Sosa-Gómez. Information Theory Based Evaluation of the RC4 Stream Cipher Outputs. Entropy. 2021; 23 (7):896.

Chicago/Turabian Style

Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Information Theory Based Evaluation of the RC4 Stream Cipher Outputs." Entropy 23, no. 7: 896.

Journal article
Published: 24 May 2021 in Applied Sciences
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The search of bijective n×n S-boxes resilient to power attacks in the space of dimension (2n)! is a controversial topic in the cryptology community nowadays. This paper proposes partitioning the space of (2n)! S-boxes into equivalence classes using the hypothetical power leakage according to the Hamming weights model, which ensures a homogeneous theoretical resistance within the class against power attacks. We developed a fast algorithm to generate these S-boxes by class. It was mathematically demonstrated that the theoretical metric confusion coefficient variance takes constant values within each class. A new search strategy—jumping over the class space—is justified to find S-boxes with high confusion coefficient variance in the space partitioned by Hamming weight classes. In addition, a decision criterion is proposed to move quickly between or within classes. The number of classes and the number of S-boxes within each class are calculated, showing that, as n increases, the class space dimension is an ever-smaller fraction of the space of S-boxes, which significantly reduces the space of search of S-boxes resilient to power attacks, when the search is performed from class to class.

ACS Style

Carlos Legón-Pérez; Ricardo Sánchez-Muiña; Dianne Miyares-Moreno; Yasser Bardaji-López; Ismel Martínez-Díaz; Omar Rojas; Guillermo Sosa-Gómez. Search-Space Reduction for S-Boxes Resilient to Power Attacks. Applied Sciences 2021, 11, 4815 .

AMA Style

Carlos Legón-Pérez, Ricardo Sánchez-Muiña, Dianne Miyares-Moreno, Yasser Bardaji-López, Ismel Martínez-Díaz, Omar Rojas, Guillermo Sosa-Gómez. Search-Space Reduction for S-Boxes Resilient to Power Attacks. Applied Sciences. 2021; 11 (11):4815.

Chicago/Turabian Style

Carlos Legón-Pérez; Ricardo Sánchez-Muiña; Dianne Miyares-Moreno; Yasser Bardaji-López; Ismel Martínez-Díaz; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Search-Space Reduction for S-Boxes Resilient to Power Attacks." Applied Sciences 11, no. 11: 4815.

Journal article
Published: 05 May 2021 in Symmetry
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In recent years, the use of Genetic Algorithms (GAs) in symmetric cryptography, in particular in the cryptanalysis of block ciphers, has increased. In this work, the study of certain parameters that intervene in GAs was carried out, such as the time it takes to execute a certain number of iterations, so that a number of generations to be carried out in an available time can be estimated. Accordingly, the size of the set of individuals that constitute admissible solutions for GAs can be chosen. On the other hand, several fitness functions were introduced, and which ones led to better results was analyzed. The experiments were performed with the block ciphers AES(t), for t{3,4,7}.

ACS Style

Osmani Tito-Corrioso; Miguel Borges-Trenard; Mijail Borges-Quintana; Omar Rojas; Guillermo Sosa-Gómez. Study of Parameters in the Genetic Algorithm for the Attack on Block Ciphers. Symmetry 2021, 13, 806 .

AMA Style

Osmani Tito-Corrioso, Miguel Borges-Trenard, Mijail Borges-Quintana, Omar Rojas, Guillermo Sosa-Gómez. Study of Parameters in the Genetic Algorithm for the Attack on Block Ciphers. Symmetry. 2021; 13 (5):806.

Chicago/Turabian Style

Osmani Tito-Corrioso; Miguel Borges-Trenard; Mijail Borges-Quintana; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Study of Parameters in the Genetic Algorithm for the Attack on Block Ciphers." Symmetry 13, no. 5: 806.

Journal article
Published: 30 April 2021 in Entropy
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Entropy makes it possible to measure the uncertainty about an information source from the distribution of its output symbols. It is known that the maximum Shannon’s entropy of a discrete source of information is reached when its symbols follow a Uniform distribution. In cryptography, these sources have great applications since they allow for the highest security standards to be reached. In this work, the most effective estimator is selected to estimate entropy in short samples of bytes and bits with maximum entropy. For this, 18 estimators were compared. Results concerning the comparisons published in the literature between these estimators are discussed. The most suitable estimator is determined experimentally, based on its bias, the mean square error short samples of bytes and bits.

ACS Style

Lianet Contreras Rodríguez; Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez. Selecting an Effective Entropy Estimator for Short Sequences of Bits and Bytes with Maximum Entropy. Entropy 2021, 23, 561 .

AMA Style

Lianet Contreras Rodríguez, Evaristo Madarro-Capó, Carlos Legón-Pérez, Omar Rojas, Guillermo Sosa-Gómez. Selecting an Effective Entropy Estimator for Short Sequences of Bits and Bytes with Maximum Entropy. Entropy. 2021; 23 (5):561.

Chicago/Turabian Style

Lianet Contreras Rodríguez; Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Selecting an Effective Entropy Estimator for Short Sequences of Bits and Bytes with Maximum Entropy." Entropy 23, no. 5: 561.

Journal article
Published: 30 April 2021 in Symmetry
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This work demonstrates the ineffectiveness of the Ripley’s K function tests, the distance to the nearest neighbor, and the empty space function in the Graphical Authentication scenario with Passpoint for the detection of non-random graphical passwords. The results obtained show that none of these tests effectively detect non-random graphical passwords; the reason for their failure is attributed to the small sample of the spatial pattern in question, where only the five points of the graphical password are analyzed. Consequently, a test based on mean distances is proposed, whose experiments show that it detects with good efficiency non-random graphical passwords in Passpoint. The test was designed to be included in the Graphical Authentication systems with Passpoint to warn the user about a possibly weak password during the registration phase, and in this way, the security of the system is increased.

ACS Style

Joaquín Herrera-Macías; Carlos Legón-Pérez; Lisset Suárez-Plasencia; Luis Piñeiro-Díaz; Omar Rojas; Guillermo Sosa-Gómez. Test for Detection of Weak Graphic Passwords in Passpoint Based on the Mean Distance between Points. Symmetry 2021, 13, 777 .

AMA Style

Joaquín Herrera-Macías, Carlos Legón-Pérez, Lisset Suárez-Plasencia, Luis Piñeiro-Díaz, Omar Rojas, Guillermo Sosa-Gómez. Test for Detection of Weak Graphic Passwords in Passpoint Based on the Mean Distance between Points. Symmetry. 2021; 13 (5):777.

Chicago/Turabian Style

Joaquín Herrera-Macías; Carlos Legón-Pérez; Lisset Suárez-Plasencia; Luis Piñeiro-Díaz; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Test for Detection of Weak Graphic Passwords in Passpoint Based on the Mean Distance between Points." Symmetry 13, no. 5: 777.

Journal article
Published: 25 March 2021 in Axioms
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In 2005, Philippe Guillot presented a new construction of Boolean functions using linear codes as an extension of the Maiorana–McFarland’s (MM) construction of bent functions. In this paper, we study a new family of Boolean functions with cryptographically strong properties, such as non-linearity, propagation criterion, resiliency, and balance. The construction of cryptographically strong Boolean functions is a daunting task, and there is currently a wide range of algebraic techniques and heuristics for constructing such functions; however, these methods can be complex, computationally difficult to implement, and not always produce a sufficient variety of functions. We present in this paper a construction of Boolean functions using algebraic codes following Guillot’s work.

ACS Style

Guillermo Sosa-Gómez; Octavio Paez-Osuna; Omar Rojas; Evaristo Madarro-Capó. A New Family of Boolean Functions with Good Cryptographic Properties. Axioms 2021, 10, 42 .

AMA Style

Guillermo Sosa-Gómez, Octavio Paez-Osuna, Omar Rojas, Evaristo Madarro-Capó. A New Family of Boolean Functions with Good Cryptographic Properties. Axioms. 2021; 10 (2):42.

Chicago/Turabian Style

Guillermo Sosa-Gómez; Octavio Paez-Osuna; Omar Rojas; Evaristo Madarro-Capó. 2021. "A New Family of Boolean Functions with Good Cryptographic Properties." Axioms 10, no. 2: 42.

Conference paper
Published: 25 February 2021 in Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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This paper explores the usability of the Ripley’s K function and the nearest neighbor distance, in the detection of clustered graphical passwords in the graphical authentication stage. For it, both tests were applied to two bases of data of 10, 000 clustered graphical passwords each, the first with graphical passwords clustered in an area lesser than the fourth part of the original image, the second clustered in an area lesser than eighth part of the image. The results show that none of these tests is effective in the detection of clustered graphical passwords, the reason of such failure is due to the short size of the spatial pattern in question, only the 5 points of the graphical password analyzed.

ACS Style

Joaquín A. Herrera-Macías; Lisset Suárez-Plasencia; Carlos M. Legón-Pérez; Luis R. Piñeiro-Díaz; Omar Rojas; Guillermo Sosa-Gómez. Effectiveness of Some Tests of Spatial Randomness in the Detection of Weak Graphical Passwords in Passpoint. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2021, 173 -183.

AMA Style

Joaquín A. Herrera-Macías, Lisset Suárez-Plasencia, Carlos M. Legón-Pérez, Luis R. Piñeiro-Díaz, Omar Rojas, Guillermo Sosa-Gómez. Effectiveness of Some Tests of Spatial Randomness in the Detection of Weak Graphical Passwords in Passpoint. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. 2021; ():173-183.

Chicago/Turabian Style

Joaquín A. Herrera-Macías; Lisset Suárez-Plasencia; Carlos M. Legón-Pérez; Luis R. Piñeiro-Díaz; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Effectiveness of Some Tests of Spatial Randomness in the Detection of Weak Graphical Passwords in Passpoint." Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering , no. : 173-183.

Conference paper
Published: 25 February 2021 in Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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The probabilistic distribution of the characteristics of Voronoi polygons has been extensively studied due to its many areas of application. In various works that differ in the number of polygons generated and in the size of their regions, it is concluded that the expected value of the characteristic number of sides of Voronoi polygons is equal to 6. In this work, this characteristic in the polygons generated by the graphical passwords of the graphical authentication system PassPoint is studied. Its distribution is estimated and it is shown that the expected value of the number of sides of the Voronoi polygons in this scenario differs from previous works. The effectiveness of this feature is evaluated to detect weak graphical passwords made up of grouped dots. They are to be detected by estimating the entropy of the number of sides and by the expected value of the number of sides. It is concluded that the distribution of the number of sides in this scenario does not the 3-parameter gamma distribution reported in previous work or any of 61 distributions that were tested, and that the entropy and the expected value of the number of sides are not efficient for the detection of weak graphical passwords of PassPoint formed by 5 grouped points.

ACS Style

Lisset Suárez-Plasencia; Joaquín A. Herrera-Macías; Carlos M. Legón-Pérez; Raisa Socorro-Llanes; Omar Rojas; Guillermo Sosa-Gómez. Analysis of the Number of Sides of Voronoi Polygons in PassPoint. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2021, 184 -200.

AMA Style

Lisset Suárez-Plasencia, Joaquín A. Herrera-Macías, Carlos M. Legón-Pérez, Raisa Socorro-Llanes, Omar Rojas, Guillermo Sosa-Gómez. Analysis of the Number of Sides of Voronoi Polygons in PassPoint. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. 2021; ():184-200.

Chicago/Turabian Style

Lisset Suárez-Plasencia; Joaquín A. Herrera-Macías; Carlos M. Legón-Pérez; Raisa Socorro-Llanes; Omar Rojas; Guillermo Sosa-Gómez. 2021. "Analysis of the Number of Sides of Voronoi Polygons in PassPoint." Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering , no. : 184-200.

Research article
Published: 06 February 2021 in International Journal of Finance & Economics
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This paper analyzes the time‐varying causality between government bond and oil returns of the United States over the monthly period of 1859:10 to 2019:03, that is, the longest possible span of historical data, starting from the beginning of the modern era of the petroleum industry. While the standard constant parameter causality test fails to pick up any evidence of causality, the time‐varying framework shows evidence of bi‐directional spillovers over the entire sample period. The results are robust to the inclusion of stock returns as a control variable in the model. We also detect evidence of time‐varying causality‐in‐volatility between sovereign bond and oil markets, as well as spillovers in returns and volatility from the oil market to corporate bonds.

ACS Style

Semei Coronado; Rangan Gupta; Saban Nazlioglu; Omar Rojas. Time‐varying causality between bond and oil markets of the United States: Evidence from over one and half centuries of data. International Journal of Finance & Economics 2021, 1 .

AMA Style

Semei Coronado, Rangan Gupta, Saban Nazlioglu, Omar Rojas. Time‐varying causality between bond and oil markets of the United States: Evidence from over one and half centuries of data. International Journal of Finance & Economics. 2021; ():1.

Chicago/Turabian Style

Semei Coronado; Rangan Gupta; Saban Nazlioglu; Omar Rojas. 2021. "Time‐varying causality between bond and oil markets of the United States: Evidence from over one and half centuries of data." International Journal of Finance & Economics , no. : 1.

Journal article
Published: 02 November 2020 in IEEE Access
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Substitution boxes are the main nonlinear component of block ciphers. The security of these ciphers against linear, differential, or side-channel attacks is dependent on the design of such component and their intrinsic properties. There are several methods that aim to cryptographically define, generate, or search for strong substitution boxes. The application of combinatorial optimization algorithms is one of the most useful methodologies in this research area. In this paper, we present a novel hybrid method based on the Leaders and Followers and hill-climbing over Hamming Weight Classes metaheuristics, coupled with a new trade-off fitness function that generates 8-bit bijective substitution boxes with good resisting properties towards classical cryptanalysis and side-channel attacks by power consumption. We address the best Pareto optimal solutions for the multi-objective optimization of non-linearity and confusion coefficient variance.

ACS Style

Alejandro Freyre-Echevarria; Ismel Martinez-Diaz; Carlos Miguel Legon Perez; Guillermo Sosa-Gomez; Omar Rojas. Evolving Nonlinear S-Boxes With Improved Theoretical Resilience to Power Attacks. IEEE Access 2020, 8, 202728 -202737.

AMA Style

Alejandro Freyre-Echevarria, Ismel Martinez-Diaz, Carlos Miguel Legon Perez, Guillermo Sosa-Gomez, Omar Rojas. Evolving Nonlinear S-Boxes With Improved Theoretical Resilience to Power Attacks. IEEE Access. 2020; 8 (99):202728-202737.

Chicago/Turabian Style

Alejandro Freyre-Echevarria; Ismel Martinez-Diaz; Carlos Miguel Legon Perez; Guillermo Sosa-Gomez; Omar Rojas. 2020. "Evolving Nonlinear S-Boxes With Improved Theoretical Resilience to Power Attacks." IEEE Access 8, no. 99: 202728-202737.

Journal article
Published: 29 October 2020 in Applied Sciences
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The bit independence criterion was proposed to evaluate the security of the S-boxes used in block ciphers. This paper proposes an algorithm that extends this criterion to evaluate the degree of independence between the bits of inputs and outputs of the stream ciphers. The effectiveness of the algorithm is experimentally confirmed in two scenarios: random outputs independent of the input, in which it does not detect dependence, and in the RC4 ciphers, where it detects significant dependencies related to some known weaknesses. The complexity of the algorithm is estimated based on the number of inputs l, and the dimensions, n and m, of the inputs and outputs, respectively.

ACS Style

Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez; Raisa Socorro-Llanes. Bit Independence Criterion Extended to Stream Ciphers. Applied Sciences 2020, 10, 7668 .

AMA Style

Evaristo Madarro-Capó, Carlos Legón-Pérez, Omar Rojas, Guillermo Sosa-Gómez, Raisa Socorro-Llanes. Bit Independence Criterion Extended to Stream Ciphers. Applied Sciences. 2020; 10 (21):7668.

Chicago/Turabian Style

Evaristo Madarro-Capó; Carlos Legón-Pérez; Omar Rojas; Guillermo Sosa-Gómez; Raisa Socorro-Llanes. 2020. "Bit Independence Criterion Extended to Stream Ciphers." Applied Sciences 10, no. 21: 7668.

Journal article
Published: 19 October 2020 in Sustainability
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Small and medium-sized tourism companies (SMEs) strongly depend on their collaborators to achieve competitiveness and sustainability. In this sense, these organizations need to identify those factors that help them to use their resources and efforts to achieve the aforementioned goals. This article proposes a model oriented to organizational sustainability in the tourism sector. A systemic approach was adopted to articulate this research; therefore, the soft systems methodology was applied to structure the problem and express a conceptual model that suggests relationships as an alternative solution to the expressed problem. Partial least squares path modeling was applied to statistically validate the relationships expressed in the construct. Results suggest that the relationships proposed in the construct are valid and may promote organizational sustainability. The ideas developed are restricted to the organizational domain and although the results apply in a Mexican context, this potential limitation can be offset by the multi-methodological approach proposed, extending the model’s application to other types of organizations. This study may enable scholars and managers to improve communication and inter-organizational relationships, allowing organizations to focus their strategies and efforts using systems thinking to increase responsiveness and adaptation.

ACS Style

Juan Núñez-Ríos; Jacqueline Sánchez-García; Omar Rojas; Elias Olivares-Benitez. Factors to Foster Organizational Sustainability in Tourism SMEs. Sustainability 2020, 12, 8657 .

AMA Style

Juan Núñez-Ríos, Jacqueline Sánchez-García, Omar Rojas, Elias Olivares-Benitez. Factors to Foster Organizational Sustainability in Tourism SMEs. Sustainability. 2020; 12 (20):8657.

Chicago/Turabian Style

Juan Núñez-Ríos; Jacqueline Sánchez-García; Omar Rojas; Elias Olivares-Benitez. 2020. "Factors to Foster Organizational Sustainability in Tourism SMEs." Sustainability 12, no. 20: 8657.

Research article
Published: 25 September 2020 in Journal of Culinary Science & Technology
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The present work examined how the esthetic impression caused by a specific mug selection seems to influence the expected flavor elicited by a coffee beverage. Participants from Mexico viewed online photographs of espresso, Americano, latte and cappuccino presented in two different mugs, including a transparent glass mug and a white ceramic mug. The type of mug influenced participants’ subjective ratings of the drinks. Espresso and Americano were expected to be more aromatic, bitter, hotter and more intense when served in a transparent glass mug rather than in a white ceramic mug. Results extend the knowledge of consumer preferences and bring an idea for the best way to better fulfill customer’s sensory expectations.

ACS Style

Violeta Corona; Ivette Vargas De La Cruz; Gustavo A. Lujan-Moreno; Jose Albors-Garrigos; Purificación García Segovia; Omar G. Rojas. Sensory expectations from aesthetic perceptions of coffee beverages presented in different mugs. Journal of Culinary Science & Technology 2020, 1 -26.

AMA Style

Violeta Corona, Ivette Vargas De La Cruz, Gustavo A. Lujan-Moreno, Jose Albors-Garrigos, Purificación García Segovia, Omar G. Rojas. Sensory expectations from aesthetic perceptions of coffee beverages presented in different mugs. Journal of Culinary Science & Technology. 2020; ():1-26.

Chicago/Turabian Style

Violeta Corona; Ivette Vargas De La Cruz; Gustavo A. Lujan-Moreno; Jose Albors-Garrigos; Purificación García Segovia; Omar G. Rojas. 2020. "Sensory expectations from aesthetic perceptions of coffee beverages presented in different mugs." Journal of Culinary Science & Technology , no. : 1-26.

Journal article
Published: 21 September 2020 in Entropy
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Generating Boolean Functions (BFs) with high nonlinearity is a complex task that is usually addresses through algebraic constructions. Metaheuristics have also been applied extensively to this task. However, metaheuristics have not been able to attain so good results as the algebraic techniques. This paper proposes a novel diversity-aware metaheuristic that is able to excel. This proposal includes the design of a novel cost function that combines several information from the Walsh Hadamard Transform (WHT) and a replacement strategy that promotes a gradual change from exploration to exploitation as well as the formation of clusters of solutions with the aim of allowing intensification steps at each iteration. The combination of a high entropy in the population and a lower entropy inside clusters allows a proper balance between exploration and exploitation. This is the first memetic algorithm that is able to generate 10-variable BFs of similar quality than algebraic methods. Experimental results and comparisons provide evidence of the high performance of the proposed optimization mechanism for the generation of high quality BFs.

ACS Style

Isaac López-López; Guillermo Sosa-Gómez; Carlos Segura; Diego Oliva; Omar Rojas. Metaheuristics in the Optimization of Cryptographic Boolean Functions. Entropy 2020, 22, 1052 .

AMA Style

Isaac López-López, Guillermo Sosa-Gómez, Carlos Segura, Diego Oliva, Omar Rojas. Metaheuristics in the Optimization of Cryptographic Boolean Functions. Entropy. 2020; 22 (9):1052.

Chicago/Turabian Style

Isaac López-López; Guillermo Sosa-Gómez; Carlos Segura; Diego Oliva; Omar Rojas. 2020. "Metaheuristics in the Optimization of Cryptographic Boolean Functions." Entropy 22, no. 9: 1052.

Conference paper
Published: 09 September 2020 in Advanced Controllers for Smart Cities
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In this work, we introduce a heuristic segmentation algorithm for the detection and subsequent segmentation of the volume of cerebrospinal fluid (CSF) that allows from MRI to calculate the CSF due to the importance of this represents to calculate the amount of anesthesia to be used in patients.

ACS Style

Enrique González-Martín; Guillermo Sosa-Gómez; Omar Rojas. An Heuristic Algorithm to Calculate the Minimum Amount of Anesthesia Using MRI. Advanced Controllers for Smart Cities 2020, 27 -38.

AMA Style

Enrique González-Martín, Guillermo Sosa-Gómez, Omar Rojas. An Heuristic Algorithm to Calculate the Minimum Amount of Anesthesia Using MRI. Advanced Controllers for Smart Cities. 2020; ():27-38.

Chicago/Turabian Style

Enrique González-Martín; Guillermo Sosa-Gómez; Omar Rojas. 2020. "An Heuristic Algorithm to Calculate the Minimum Amount of Anesthesia Using MRI." Advanced Controllers for Smart Cities , no. : 27-38.

Conference paper
Published: 09 September 2020 in Advanced Controllers for Smart Cities
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In this chapter, we discuss results obtained on an application of the Hadamard transform to cryptanalysis, and in particular, we determine the probability to decipher different pseudo-random number generators used as components of stream ciphers.

ACS Style

Guillermo Sosa-Gómez; Omar Rojas; Octavio Páez-Osuna. An Application of Hadamard Transform to Test Stream Ciphers. Advanced Controllers for Smart Cities 2020, 255 -262.

AMA Style

Guillermo Sosa-Gómez, Omar Rojas, Octavio Páez-Osuna. An Application of Hadamard Transform to Test Stream Ciphers. Advanced Controllers for Smart Cities. 2020; ():255-262.

Chicago/Turabian Style

Guillermo Sosa-Gómez; Omar Rojas; Octavio Páez-Osuna. 2020. "An Application of Hadamard Transform to Test Stream Ciphers." Advanced Controllers for Smart Cities , no. : 255-262.

Journal article
Published: 10 August 2020 in International Journal of Energy Economics and Policy
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Electricity losses are an important problem worldwide that shuld be mitigated, since they generate an impact on CO2 emissions and drive a possible rate increase. The benefits of the reduction of such losses are savings, a better environment and less infrastructure needs, amongst others. However, in order to generate reductions, it is imperative to measure the factors associated with such losses. Thus, the objective of this study is to explore the factors associated with electricity losses in the world. A database of 91 countries and 10 years of available data, from 2005 to 2014, was built, with variables taken according to our literature review and obtaind from different publicly available sources. A panel data model with international information was then tested in order to find the determinants of power losses. The model with the best fit was one with random effects. Our results show that the variables unemployment and crime were significant and positive at one percent, while urbanization and education were significant and negative also at one percent. Finally, we provide some policy implications on the evidence of how electricity losses are associated with low education, high unemployment, high homicide rates, and less urbanization.Keywords: Electricity losses, T&D losses, electricity theft, non-technical losses, power losses, random effects.JEL Classifications: L94, N70, Q41DOI: https://doi.org/10.32479/ijeep.9599

ACS Style

Hugo Briseño; Omar Rojas. FACTORS ASSOCIATED WITH ELECTRICITY LOSSES: A PANEL DATA PERSPECTIVE. International Journal of Energy Economics and Policy 2020, 10, 281 -286.

AMA Style

Hugo Briseño, Omar Rojas. FACTORS ASSOCIATED WITH ELECTRICITY LOSSES: A PANEL DATA PERSPECTIVE. International Journal of Energy Economics and Policy. 2020; 10 (5):281-286.

Chicago/Turabian Style

Hugo Briseño; Omar Rojas. 2020. "FACTORS ASSOCIATED WITH ELECTRICITY LOSSES: A PANEL DATA PERSPECTIVE." International Journal of Energy Economics and Policy 10, no. 5: 281-286.

Journal article
Published: 04 July 2020 in Entropy
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The analysis of independence between statistical randomness tests has had great attention in the literature recently. Dependency detection between statistical randomness tests allows one to discriminate statistical randomness tests that measure similar characteristics, and thus minimize the amount of statistical randomness tests that need to be used. In this work, a method for detecting statistical dependency by using mutual information is proposed. The main advantage of using mutual information is its ability to detect nonlinear correlations, which cannot be detected by the linear correlation coefficient used in previous work. This method analyzes the correlation between the battery tests of the National Institute of Standards and Technology, used as a standard in the evaluation of randomness. The results of the experiments show the existence of statistical dependencies between the tests that have not been previously detected.

ACS Style

Jorge Augusto Karell-Albo; Carlos Miguel Legón-Pérez; Evaristo José Madarro-Capó; Omar Rojas; Guillermo Sosa-Gómez. Measuring Independence between Statistical Randomness Tests by Mutual Information. Entropy 2020, 22, 741 .

AMA Style

Jorge Augusto Karell-Albo, Carlos Miguel Legón-Pérez, Evaristo José Madarro-Capó, Omar Rojas, Guillermo Sosa-Gómez. Measuring Independence between Statistical Randomness Tests by Mutual Information. Entropy. 2020; 22 (7):741.

Chicago/Turabian Style

Jorge Augusto Karell-Albo; Carlos Miguel Legón-Pérez; Evaristo José Madarro-Capó; Omar Rojas; Guillermo Sosa-Gómez. 2020. "Measuring Independence between Statistical Randomness Tests by Mutual Information." Entropy 22, no. 7: 741.

Journal article
Published: 05 May 2020 in EAI Endorsed Transactions on Pervasive Health and Technology
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ACS Style

Enrique González-Martín; Guillermo Sosa-Gómez; Omar Rojas. Algorithm to detect and calculate the cerebrospinal fluid (CSF) through Magnetic Resonance Imaging (MRI). EAI Endorsed Transactions on Pervasive Health and Technology 2020, 5, 1 .

AMA Style

Enrique González-Martín, Guillermo Sosa-Gómez, Omar Rojas. Algorithm to detect and calculate the cerebrospinal fluid (CSF) through Magnetic Resonance Imaging (MRI). EAI Endorsed Transactions on Pervasive Health and Technology. 2020; 5 (20):1.

Chicago/Turabian Style

Enrique González-Martín; Guillermo Sosa-Gómez; Omar Rojas. 2020. "Algorithm to detect and calculate the cerebrospinal fluid (CSF) through Magnetic Resonance Imaging (MRI)." EAI Endorsed Transactions on Pervasive Health and Technology 5, no. 20: 1.

Construction management
Published: 28 April 2020 in KSCE Journal of Civil Engineering
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In the face of the high variability in the completion of construction projects, the following research is generated. In the literature we can find several proposals to program projects, however, the variability of the activities causes high variability in the completion date of the projects. We hope that the proposed method, by controlling the start of activities, will ensure the completion date of the projects, by fixing the start of every activity with a high level of probabilistic confidence for the planned project duration. The proposed fixed start method (FSM) was tested in two case studies by using discrete event simulation. Project completion duration results were compared with the critical path method (CPM) and the program evaluation and review technique (PERT). Project completion was evaluated in the case studies by the coefficient of variance (COV), mean, and variance. The new method decreased the scheduled duration variability while meeting project completion times.

ACS Style

Francisco Moreno; Francisco Orozco; Omar Rojas; Bolivar Senior; Mani Poshdar; Eric Forcael. A Fixed Start Scheduling Approach for Repetitive Construction Projects. KSCE Journal of Civil Engineering 2020, 24, 1671 -1682.

AMA Style

Francisco Moreno, Francisco Orozco, Omar Rojas, Bolivar Senior, Mani Poshdar, Eric Forcael. A Fixed Start Scheduling Approach for Repetitive Construction Projects. KSCE Journal of Civil Engineering. 2020; 24 (6):1671-1682.

Chicago/Turabian Style

Francisco Moreno; Francisco Orozco; Omar Rojas; Bolivar Senior; Mani Poshdar; Eric Forcael. 2020. "A Fixed Start Scheduling Approach for Repetitive Construction Projects." KSCE Journal of Civil Engineering 24, no. 6: 1671-1682.