Optimization of Tool Path Length on Three-Dimensional Drilling Application Using Ant Colony Algorithm

The lower machining time is important characteristic in the drilling machining process. Drilling process costs will increase if the machining time is high. Therefore, the main objective of this research is to develop Ant Colony Algorithm (ACO) to reduce the machining time by obtain the optimal tool path length. By using this algorithm, it can minimize the tool path length and significantly decreasing the machining time of drilling process. Simulating in 3-dimensional drilling on ACO has been constructed to minimize the shortest path of the drilling process. There are two type of workpiece has been used, which is simple block with 10 holes and complex block design that has 154 holes. ACO algorithm has been developed in Matlab R2017b to determine the optimal parameters of ACO of tool path length in drilling. Besides, simulation also has been done to investigate the effect of ACO parameter which is weight of pheromone (α), weight of trail (β), evaporation coefficient (e), and number of iterations. As a result, by define the parameter of iteration number at 900, the optimum parameter of weight of pheromone (α) is 5, weight of trail (β) is 4 and evaporation coefficient (e) is 0.4. Based on these parameters, the minimal tool path length obtain for simple and complex model are 286.965 mm and 6770.9860 mm respectively. Then, the result of tool path length of ACO simulation has been compared with the Mastercam outcome. ACO achieves a total tool path length of 286.965 mm while Mastercam achieved 569.878 mm for simple block design. Meanwhile, for complex block design, ACO produces a total tool path length of 6770.9860 mm while Mastercam has generate 55828.9050 mm of tool path length. By comparing these two approaches, ACO and Mastercam, ACO has that the short total tool path length by 49.64% on simple block design and 87.87% for complex block design.

Measuring and predicting variation in the interestingness of physical structures

Curiosity drives much of human behavior, but its open-ended nature makes it hard to study in the laboratory. Moreover, computational theories of curiosity – models of how intrinsic motivation promotes complex behaviors – have been challenging to test because of technical limits. To circumvent this problem, we develop a new way to assess intrinsic motivation for building: we assume people build what they find interesting, so we asked them to rate the “interestingness” of visual stimuli – in this case, simple block towers. Adults gave a range of ratings to towers built by children, with taller towers rated higher. To probe interestingness further, we developed controlled tower stimuli in a simulated 3D environment. While tower height predicted much of the variation in ratings, people also favored more precarious towers, as inferred from geometric features and simulated dynamics. These ratings and features therefore give a clear target for computational accounts of curiosity to explain.

An ultra-low complexity of 2:1 multiplexer block in QCA technology

<p>The limitations related to CMOS such as power consumption and parasitic capacitance lead scientists to search for new technologies. Quantum-dot cellular automata (QCA) is a CMOS alternative technology that uses charges instead of voltage level for binary representation. In QCA, many metrics are used for circuit differentiation such as delay, complexity and area. In this work, a new simple block of 2:1 QCA-Multiplexer is proposed. The proposed block is more efficient than previous designs by 0.43%, 0.53%, 50% and 0.72 in terms of area, complexity, delay and cost. QCADesigner software is used to design and verify the proposed circuit.</p>

PENINGKATAN KOMPETENSI KONSTRUKSI BALOK SEDERHANA MELALUI MODEL PEMBELAJARAN PROBLEM BASED LEARNING DIPADUKAN DENGAN METODE DRILL

The purpose of this study was to improve the competence of calculating simple Block Construction through the Problem Based Learning Model Combined with the Drill Method. The implementation of this classroom action research consisted of two cycles (sycle I and cycle II) with each having two meetings. The choice of this title is based on the fact that the grades of Engineering Mechanics are low as evidenced by the student daily score. With the problem based Learning model combined with the Drll method, the competence of students increases in the competence of counting simple blocks.The results obtained showed that in first cycle, the student activeess aspect reached an average of 79 % (enough Active) and achievement of knowledge value was 38,2 % of competent students. In the second cycle, there was significant increase with student activeness increasing to an average of 87 % (Active), while the achievement of the knowledge score increased to 85,3 % of competent students

Updating bridge axle loads using WIM in Switzerland

<p>The Eurocode LM1 for traffic loads on bridges features side-by-side tandem axles, as well as uniformly distributed lane loads. This LM is mirrored in the Swiss code SIA 261, for new structures, as well as SIA 269, for existing structures, where updating is permitted based on existing traffic in the form of updated alpha factors, αQ1 and αQ2. The research herein uses an extensive WIM database to update alpha factors for Swiss traffic. For the first (slow) lane, this is done using simple block maxima of tandem axle statistics (daily, weekly, and yearly block maxima results are compared) with log-normal fitting to the extreme value statistic. For the second lane, a novel approach is used which reconstructs real multiple-presence scenarios from the WIM data to predict the total joint load across both lanes. The result of the single lane and joint analyses are recommended updated alpha factors reduced by a factor of one third as compared to those mandated for new construction.</p>

Modification of Industrial Polyphenylene Ether Sulfone by New Block Copolymers Containing Oxime Groups

New universal modifiers (UM) - simple block copoly-ether-hydroximates of various chemical structures were synthesized. It was found that a 5 % by weight addition of UM to Radel R, an industrial aromatic simple polyethersulfone, improves its heat, heat resistance and physicomechanical properties.

Classifying 3- and 4-designs on 28 points invariant under the group S6(2)

In this paper, we determine all simple block-transitive [Formula: see text]- and [Formula: see text]-designs on [Formula: see text] points admitting the group [Formula: see text] as the automorphism group. Thereby, we found 15 new [Formula: see text]-designs and two new [Formula: see text]-designs with the automorphism group [Formula: see text] up to isomorphism. Some of these designs are self-complementary and resolvable.

There’s an App for That, and I Made It

The Thunkable online platform is an easy-to-use resource for creating apps for mobile devices. Computational thinking is at the heart of problem solving in computer science, and research suggests students’ computational thinking improves when they use simple block coding systems similar to the format used for Thunkable.