Daniel Ochoa

Dr. Daniel Ochoa


Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Verified
Journal Article
Open access
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ALAngel J. Lopez
Angel J. Lopez
PAPaola Astegiano
Paola Astegiano
SGSidharta Gautama
Sidharta Gautama
DODaniel Ochoa
Daniel Ochoa
CTChris M. J. Tampère
Chris M. J. Tampère
CBCarolien Beckx
Carolien Beckx
Common goals of sustainable mobility approaches are to reduce the need for travel, to facilitate modal shifts, to decrease trip distances and to improve energy efficiency in the transportation systems. Among these issues, modal shift plays an important role for the adoption of vehicles with fewer or zero emissions. Nowadays, the electric bike (e-bike) is becoming a valid alternative to cars in urban areas. However, to promote modal shift, a better understanding of the mobility behaviour of e-bike users is required. In this paper, we investigate the mobility habits of e-bikers using GPS data collected in Belgium from 2014 to 2015. By analysing more than 10,000 trips, we provide insights about e-bike trip features such as: distance, duration and speed. In addition, we offer a deep look into which routes are preferred by bike owners in terms of their physical characteristics and how weather influences e-bike usage. Results show that trips with higher travel distances are performed during working days and are correlated with higher average speeds. Usage patterns extracted from our data set also indicate that e-bikes are preferred for commuting (home-work) and business (work related) trips rather than for recreational trips.

28 August 2020 in Applications in Plant Sciences
Verified
Journal Article
Open access
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JFJorge Ugarte Fajardo
Jorge Ugarte Fajardo
OAOswaldo Bayona Andrade
Oswaldo Bayona Andrade
RBRonald Criollo Bonilla
Ronald Criollo Bonilla
JCJuan Cevallos-Cevallos
Juan Cevallos-Cevallos
MMMaría Mariduena‐Zavala
María Mariduena‐Zavala
José Luis Vicente-VillardónJosé Luis Vicente-Villardón
José Luis Vicente-Villardón
Premise: Black Sigatoka is one of the most severe banana (Musa spp.) diseases worldwide, but no methods for the rapid early detection of this disease have been reported. This paper assesses the use of hyperspectral images for the development of a partial‐least‐squares penalized‐logistic‐regression (PLS–PLR) model and a hyperspectral biplot (HS biplot) as a visual tool for detecting the early stages of black Sigatoka disease.Methods: Young (three‐month‐old) banana plants were inoculated with a conidia suspension of the black Sigatoka fungus (Pseudocercospora fijiensis). Selected infected and control plants were evaluated using a hyperspectral imaging system at wavelengths in the range of 386–1019 nm. PLS–PLR models were run on the hyperspectral data set. The prediction power was assessed using leave‐one‐out cross‐validation as well as external validation.Results: The PLS–PLR model was able to predict the presence of the disease with a 98% accuracy. The wavelengths with the highest contribution to the classification ranged from 577 to 651 nm and from 700 to 1019 nm.Discussion: PLS–PLR and HS biplot effectively estimated the presence of black Sigatoka disease at the early stages and can be used to graphically represent the relationship between groups of leaves and both visible and near‐infrared wavelengths.

6 September 2018 in Sensors
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Journal Article
Open access
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JRJorge Rodriguez-Echeverria
Jorge Rodriguez-Echeverria
ISIvana Semanjski
Ivana Semanjski
SGSidharta Gautama
Sidharta Gautama
Nico Van de WegheNico Van de Weghe
Nico Van de Weghe
DODaniel Ochoa
Daniel Ochoa
Understanding tourism related behavior and traveling patterns is an essential element of transportation system planning and tourism management at tourism destinations. Traditionally, tourism market segmentation is conducted to recognize tourist’s profiles for which personalized services can be provided. Today, the availability of wearable sensors, such as smartphones, holds the potential to tackle data collection problems of paper-based surveys and deliver relevant mobility data in a timely and cost-effective way. In this paper, we develop and implement a hierarchical clustering approach for smartphone geo-localized data to detect meaningful tourism related market segments. For these segments, we provide detailed insights into their characteristics and related mobility behavior. The applicability of the proposed approach is demonstrated on a use case in the Province of Zeeland in the Netherlands. We collected data from 1505 users during five months using the Zeeland app. The proposed approach resulted in two major clusters and four sub-clusters which we were able to interpret based on their spatio-temporal patterns and the recurrence of their visiting patterns to the region.

1 January 2011
Verified
Book Chapter
Closed access
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JVJonas De Vylder
Jonas De Vylder
DODaniel Ochoa
Daniel Ochoa
WPWilfried Philips
Wilfried Philips
LCLaury Chaerle
Laury Chaerle
DSDominique Van Der Straeten
Dominique Van Der Straeten

1 May 2017
Verified
Conference Paper
Closed access
AVAngel J. Valencia
Angel J. Valencia
RIRoger M. Idrovo
Roger M. Idrovo
ASAngel D. Sappa
Angel D. Sappa
DGDouglas Plaza Guingla
Douglas Plaza Guingla
DODaniel Ochoa
Daniel Ochoa
In general, robot grasping approaches are based on the usage of multi-finger grippers. However, when large size objects need to be manipulated vacuum grippers are preferred, instead of finger based grippers. This paper aims to estimate the best picking place for a two suction cups vacuum gripper, when planar objects with an unknown size and geometry are considered. The approach is based on the estimation of geometric properties of object's shape from a partial cloud of points (a single 3D view), in such a way that combine with considerations of a theoretical model to generate an optimal contact point that minimizes the vacuum force needed to guarantee a grasp. Experimental results in real scenarios are presented to show the validity of the proposed approach.

30 September 2022 in Plants
Verified
Journal Article
Open access
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JFJorge Ugarte Fajardo
Jorge Ugarte Fajardo
MMMaría Maridueña-Zavala
María Maridueña-Zavala
JCJuan Cevallos-Cevallos
Juan Cevallos-Cevallos
DODaniel Ochoa
Daniel Ochoa
Current chemical methods used to control plant diseases cause a negative impact on the environment and increase production costs. Accurate and early detection is vital for designing effective protection strategies for crops. We evaluate advanced distributed edge intelligence techniques with distinct learning principles for early black sigatoka disease detection using hyperspectral imaging. We discuss the learning features of the techniques used, which will help researchers improve their understanding of the required data conditions and identify a method suitable for their research needs. A set of hyperspectral images of banana leaves inoculated with a conidial suspension of black sigatoka fungus (Pseudocercospora fijiensis) was used to train and validate machine learning models. Support vector machine (SVM), multilayer perceptron (MLP), neural networks, N-way partial least square–discriminant analysis (NPLS-DA), and partial least square–penalized logistic regression (PLS-PLR) were selected due to their high predictive power. The metrics of AUC, precision, sensitivity, prediction, and F1 were used for the models’ evaluation. The experimental results show that the PLS-PLR, SVM, and MLP models allow for the successful detection of black sigatoka disease with high accuracy, which positions them as robust and highly reliable HSI classification methods for the early detection of plant disease and can be used to assess chemical and biological control of phytopathogens.