A method is developed for optimizing surface machining plans on the basis of a mathematical model in which the influence of the diameter in each pass on the dimensional precision is taken into ...account in multipass surface machining on multispindle automatic lathes. That permits calculation of the number of operations, the cutting depth in each pass, and the intermediate quality classes corresponding to maximum machining productivity in automatic lathes.
This paper presents a method for automatic plants’ height measurements in indoor hydroponic plantations by using the OpenCV library and the Python programming language. Using the elaborated algorithm ...and Raspberry Pi driven system with an external camera, the growth process of multiple pak choi cabbages (Brassica rapa L. subsp. Chinensis) was observed. The main aim and novelty of the presented algorithm was to observe the plants’ height in hydroponic stations, where the reflective foil is used, to extract the plants’ growth rate as a parameter. Basing on the pictures of the hydroponic plantation, the bases of the plants, reflections, and plants themselves were separated. Finally, the algorithm was used for plants’ height estimation. The achieved results were then compared to the results obtained manually. The algorithm will be used in future research for plants’ growth optimization.
This paper presents a method for automatically measuring plants’ heights in indoor hydroponic plantations using the OpenCV library and the Python programming language. Using the elaborated algorithm ...and Raspberry Pi-driven system with an external camera, the growth process of multiple pak choi cabbages (Brassica rapa L. subsp. Chinensis) was observed. The main aim and novelty of the presented research is the elaborated algorithm, which allows for observing the plants’ height in hydroponic stations, where reflective foil is used. Based on the pictures of the hydroponic plantation, the bases of the plants, their reflections, and plants themselves were separated. Finally, the algorithm was used for estimating the plants’ heights. The achieved results were then compared to the results obtained manually. With the help of a ML (Machine Learning) approach, the algorithm will be used in future research to optimize the plants’ growth in indoor hydroponic plantations.
The present study highlights the design and testing of a robotic arm and its vulnerabilities. The purpose of this paper is to develop, manufacture, test, and improve the robotic arm as a separate ...system. Additionally, its actuators in operation and the evaluation of challenges in Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis (or vulnerability assessment) are considered. The specific objective consists in designing the robot’s actuators to generate effective work and torque in operational conditions of the external environment in which are found objects that have a resistance force. Another secondary specific objective is to realize an automatic loop with a corresponding architecture based on a previously stressed actuator configuration.
•A manual review of statistical usage in 161 papers in 5 top journals.•A semi-automatic classification of 5,196 papers in said journals.•Identification and analysis of statistical practices in ...empirical software engineering.•A conceptual model with suggestions on how to apply different statistical methods.•Proposal on how practical and statistical significance can be argued in practitioners’ context.
Software engineering research is evolving and papers are increasingly based on empirical data from a multitude of sources, using statistical tests to determine if and to what degree empirical evidence supports their hypotheses. To investigate the practices and trends of statistical analysis in empirical software engineering (ESE), this paper presents a review of a large pool of papers from top-ranked software engineering journals. First, we manually reviewed 161 papers and in the second phase of our method, we conducted a more extensive semi-automatic classification of papers spanning the years 2001–2015 and 5196 papers.
Results from both review steps was used to: i) identify and analyse the predominant practices in ESE (e.g., using t-test or ANOVA), as well as relevant trends in usage of specific statistical methods (e.g., nonparametric tests and effect size measures) and, ii) develop a conceptual model for a statistical analysis workflow with suggestions on how to apply different statistical methods as well as guidelines to avoid pitfalls.
Lastly, we confirm existing claims that current ESE practices lack a standard to report practical significance of results. We illustrate how practical significance can be discussed in terms of both the statistical analysis and in the practitioner’s context.
Automatics and Robotics subjects are always greatly improved when classroom teaching is supported by adequate laboratory courses and experiments following the "learning by doing" paradigm, which ...provides students a deep understanding of theoretical lessons. However, expensive equipment and limited time prevent teachers having sufficient educational platforms, and several low cost and flexible solutions have been developed to permit an effective teaching in Automatics and Robotics at a reasonable cost. Virtual and remote laboratories are inside this group of solutions as Web-based experimentation tools which have demonstrated the importance and effectiveness of hand-on experiences. This paper presents an experience teaching based on a blended-learning method using as experimentation tool a virtual and remote robotic laboratory called
RobUALab, which is also described in the paper, in Automatics and Robotics subjects of the Computer Science degree at the University of Alicante. Students experiment with a set of hand-on exercises about Automatics and Robotics using
RobUALab, firstly in face-to-face classes where they experiment in-situ with the real plant and, afterwards, they access to the experimentation environment in order to finish remotely their practical exercises outside the laboratory. The results obtained in the evaluation of the educational methodology proposed attest its efficiency in terms of learning degree and performance of the students.
► We present a teaching experience based on a blended-learning method using
RobUALab. ►
RobUALab is a virtual and remote lab for learning in Automatics and Robotics subjects. ► Students experiment with a set of hand-on exercises using
RobUALab. ► The results presented of the educational method proposed attest its efficiency.
Let
, where
is the sum of binary digits function. The sequence
is the well-known Prouhet-Thue-Morse sequence. In this note we study the sequence
, where
and for
we define
recursively as follows:
. We ...prove several results concerning arithmetic properties of the sequence
. In particular, we prove non-vanishing of
for
, automaticity of the sequence
for each m, and other results.
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