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Artykuły w czasopismach na temat „Symmetrical Designs”

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Data publikacji: 8 września 2023

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1

Wang, Xiaodi, Xueping Chen i Dennis K. J. Lin. "Sliced symmetrical Latin hypercube designs". Journal of Statistical Planning and Inference 218 (maj 2022): 59–72. http://dx.doi.org/10.1016/j.jspi.2021.09.004.

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Bose, Mausumi. "The mathematics of symmetrical factorial designs". Resonance 8, nr 9 (wrzesień 2003): 14–19. http://dx.doi.org/10.1007/bf02837917.

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Reja, Ahmed Hameed, i Asaad A. M. Al Salih. "Symmetrical Designs of High Selectivity Metamaterialized LPFs". Procedia Computer Science 89 (2016): 716–25. http://dx.doi.org/10.1016/j.procs.2016.06.041.

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Gupta, Sudhir. "Designs for symmetrical parallel line assays obtainable through group divisible designs". Communications in Statistics - Theory and Methods 17, nr 11 (styczeń 1988): 3865–68. http://dx.doi.org/10.1080/03610928808829841.

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Oliynyk, O., i L. Kushmar. "Grapho-analytic method of determining the minimum groove at the pivot root of symmetrical switches". Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", nr 41 (28.06.2023): 107–16. http://dx.doi.org/10.32703/2617-9059-2023-41-9.

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Switches are a barrier place in the track for setting the permissible speeds for trains on the main tracks, as they have special structural devices for branching traffic from the main track to the secondary track. Symmetrical switches have a number of advantages compared to conventional ones: with the same brand with conventional switches, symmetric ones allow significantly higher speeds for the train movement with side tracks; symmetrical switches have a shorter length with the same radii of the transfer curves; it is possible to apply crosspieces with a larger angle than in the conventional switches while preserving the length of the curve and the radius. The specified qualities of single, versatile, symmetrical switches determined their use scope. On the main transport tracks, symmetrical switches are used in sorting parks of the stations, as well as in main tracks when it is necessary to achieve increased speeds of movement on both side tracks. Symmetric switches according to the purpose and design have the significant differences from the most conventional switches, and therefore the study of these designs is important and relevant. Moreover, very few scientific works were devoted to such studies of Ukrainian railways.

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Kota, S. "Automatic Selection of Mechanism Designs from a Three-Dimensional Design Map". Journal of Mechanical Design 114, nr 3 (1.09.1992): 359–67. http://dx.doi.org/10.1115/1.2926561.

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Often a simple (four-bar linkage) mechanism to trace a desired path is sought. Dimensions of linkages to trace a specified coupler curve exactly are difficult to determine. Precision point techniques do not guarantee that the desired path will be generated. The methodology presented in this paper is based on indirect synthesis approach to select four-bar linkages that trace a given desired path. A practical, computer-aided three-dimensional design chart for the selection of four-bar linkage candidate designs that trace symmetrical paths is presented. It is based on hypothesis that any arbitrary path can be approximated by a symmetrical path at least for the purpose of choosing an initial design. Four-bar linkages that generate symmetrical paths are easier to design and exhibit a definite pattern of changes in their shape as the linkage parameters are varied. General design categories and the corresponding solution subspaces in the 3-D design map are identified to aid in the selection of candidate designs. The automation of the design-selection process requires a satisfactory means to quantitatively compare the “desired” and the “known” coupler curves. This paper addresses the issues involved in quantitative comparison of two arbitrary curves using parameterization and shape evaluation. A design example of automated selection of mechanism designs is also presented.

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Vandenhende, Francois, i Benito J. Cerimele. "Symmetrical Crossover Designs for Bilateral Pharmacokinetic Drug Interactions". Drug Information Journal 34, nr 2 (kwiecień 2000): 411–19. http://dx.doi.org/10.1177/009286150003400209.

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Nigam, A. K., i G. M. Boopathy. "Incomplete block designs for symmetrical parallel line assays". Journal of Statistical Planning and Inference 11, nr 1 (styczeń 1985): 111–17. http://dx.doi.org/10.1016/0378-3758(85)90031-x.

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Sury, B., i S. S. Shrikhande. "The Impossibility of Certain Symmetrical Balanced Incomplete Block Designs". Resonance 26, nr 2 (luty 2021): 283–89. http://dx.doi.org/10.1007/s12045-021-1127-y.

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10

Qin, Hong, i Dan Li. "Connection between uniformity and orthogonality for symmetrical factorial designs". Journal of Statistical Planning and Inference 136, nr 8 (sierpień 2006): 2770–82. http://dx.doi.org/10.1016/j.jspi.2004.11.005.

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Qin, Hong, Ming-yao Ai i Jian-hui Ning. "Connection Among Some Optimal Criteria for Symmetrical Fractional Factorial Designs". Acta Mathematicae Applicatae Sinica, English Series 21, nr 4 (listopad 2005): 545–52. http://dx.doi.org/10.1007/s10255-005-0263-6.

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Ai, Mingyao, i Shuyuan He. "Interaction balance for symmetrical factorial designs with generalized minimum aberration". Statistical Papers 47, nr 1 (styczeń 2006): 125–35. http://dx.doi.org/10.1007/s00362-005-0276-5.

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13

Cárdenas, Rodrigo Andrés, i Lauren Julius Harris. "Symmetrical decorations enhance the attractiveness of faces and abstract designs". Evolution and Human Behavior 27, nr 1 (styczeń 2006): 1–18. http://dx.doi.org/10.1016/j.evolhumbehav.2005.05.002.

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14

Zhu, Wei, i Weng Kee Wong. "Bayesian optimal designs for estimating a set of symmetrical quantiles". Statistics in Medicine 20, nr 1 (2000): 123–37. http://dx.doi.org/10.1002/1097-0258(20010115)20:1<123::aid-sim643>3.0.co;2-5.

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15

Singh, M., i A. Dey. "A note on incomplete block designs for symmetrical parallel line assays". Communications in Statistics - Theory and Methods 16, nr 12 (styczeń 1987): 3555–64. http://dx.doi.org/10.1080/03610928708829590.

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Chang, Chebg-Tao, i Joanna Cheng. "Three-factor symmetrical balanced designs with full efficiency for main effects". Communications in Statistics - Theory and Methods 19, nr 12 (styczeń 1990): 4757–72. http://dx.doi.org/10.1080/03610929008830472.

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17

Qin, Hong, i Yin-Bao Chen. "Some results on generalized minimum aberration for symmetrical fractional factorial designs". Statistics & Probability Letters 66, nr 1 (styczeń 2004): 51–57. http://dx.doi.org/10.1016/j.spl.2003.10.006.

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Begun, Alexander, i Wilfried Seidel. "On Symmetrical Equidistant Minimax Designs in Statistical Experiments with Binary Data". Communications in Statistics - Simulation and Computation 33, nr 2 (2.01.2004): 459–88. http://dx.doi.org/10.1081/sac-120037247.

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19

Zaslavsky, Claudia. "Symmetry In American Folk Art". Arithmetic Teacher 38, nr 1 (wrzesień 1990): 6–12. http://dx.doi.org/10.5951/at.38.1.0006.

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Symmetrical designs and repeated patterns are important elements in the arts of many cultures—in fabrics, masks, pottery, and wood carvings, to mention just a few examples (Appleton 1971; Chatley 1986; Harris 1987; Krause 1983; Larsen and Gull 1977; Zaslavsky 1973, 1979, 1981, 1987). Many examples can be found in the textile arts alone. Symmetrical patterns in quilts and rugs, the subject of this article, often have symbolic meaning and play a role similar to writing in conveying ideas. The artist, who is usually anonymous, may introduce variations on the traditional themes or may boldly create new designs.

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20

Semenov, А. B., i T. S. Abbasova. "Synthesis of symmetrical cables for infocommunication systems with improved noise immunity characteristics". Informacionno-technologicheskij vestnik, nr 4 (30.12.2018): 99–108. http://dx.doi.org/10.21499/2409-1650-2018-4-99-108.

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A synthesis of construction of cables of category 6a for infocommunication systems with improved characteristics of noise immunity is carried out. The parameters of transient pickups and total transient pickups for the proposed cable design are calculated, and the cable diameter of the initial and proposed designs is estimated. The estimation of improvement of mass-dimension parameters of a cable of a proposed design is carried out. It is shown that due to chamber (group) unearthed screening, it is possible to significantly reduce the influence characteristics and the mass-dimensional parameters of the cable.

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21

Victorbabu, B. Re. "Modified Second Order Slope Rotatable Designs using Symmetrical Unequal Block Arrangements with two Unequal Block Sizes". Mapana - Journal of Sciences 5, nr 1 (21.06.2006): 21–29. http://dx.doi.org/10.12723/mjs.8.3.

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22

Koster, Lennard A., Joris E. Meinardi, Bart L. Kaptein, Enrike Van der Linden - Van der Zwaag i Rob G. H. H. Nelissen. "Two-year RSA migration results of symmetrical and asymmetrical tibial components in total knee arthroplasty: a randomized controlled trial". Bone & Joint Journal 103-B, nr 5 (1.05.2021): 855–63. http://dx.doi.org/10.1302/0301-620x.103b5.bjj-2020-1575.r2.

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Aims The objective of this study was to compare the two-year migration pattern and clinical outcomes of a total knee arthroplasty (TKA) with an asymmetrical tibial design (Persona PS) and a well-proven TKA with a symmetrical tibial design (NexGen LPS). Methods A randomized controlled radiostereometric analysis (RSA) trial was conducted including 75 cemented posterior-stabilized TKAs. Implant migration was measured with RSA. Maximum total point motion (MTPM), translations, rotations, clinical outcomes, and patient-reported outcome measures (PROMs) were assessed at one week postoperatively and at three, six, 12, and 24 months postoperatively. Results A linear mixed-effect model using RSA data of 31 asymmetrical and 38 symmetrical TKAs did not show a difference in mean MTPM migration pattern of the tibial or femoral components. Mean tibial component MTPM at two years postoperative of the asymmetrical TKA design was 0.93 mm and 1.00 mm for the symmetrical design. For the femoral component these values were 1.04 mm and 1.14 mm, respectively. No significant differences were observed in other migration parameters or in clinical and PROM measurements. Conclusion The TKA design with an asymmetrical tibial component has comparable component migration with the proven TKA with a symmetrical tibial component. This suggests the risk of long-term aseptic loosening of the two designs is comparable. Cite this article: Bone Joint J 2021;103-B(5):855–863.

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23

Karavai, M. F., P. P. Parkhomenko i V. S. Podlazov. "Combinatorial methods for constructing bipartite uniform minimal quasicomplete graphs (symmetrical block designs)". Automation and Remote Control 70, nr 2 (luty 2009): 312–27. http://dx.doi.org/10.1134/s000511790902012x.

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Ray, Steven, i Yessica Nataliani. "Pengolahan Citra Digital pada Pembuatan Motif Keramik Menggunakan Grup Simetri". Jurnal Buana Informatika 13, nr 1 (1.04.2022): 11–22. http://dx.doi.org/10.24002/jbi.v13i1.5499.

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Abstract. Digital Image Processing in Making Ceramic Patterns Using Symmetry Groups. The large number of requests for ceramic motifs makes ceramic craftsmen have to create a new and fast ceramic motif design idea. The generation of patterns on ceramic motifs digitally can be used by ceramic craftsmen. This study discusses the pattern of ceramic patterns using digital image processing with digital applications. The ceramic pattern design is made with a symmetrical pattern by the process of translation, rotation, reflection, and sliding reflection. The purpose of this research is to develop various ceramic patterns by applying symmetrical groups as motif designs on ceramics. The application is expected to make it easier for designers to find or create new designs from a basic pattern or what is commonly called a unit pattern or unit grid. The results obtained from this study are 17 patterns from 17 symmetric groups originating from one basic pattern. The combination of several patterns is also formed from the symmetry group into a new, more varied pattern.Keywords: Symmetric Group, Ceramic, Crystallography, Transformation. Abstrak. Banyaknya permintaan motif keramik membuat pengrajin keramik harus menciptakan sebuah ide desain motif keramik yang baru dan cepat. Pembangkitan pola pada motif keramik secara digital dapat digunakan oleh para pengrajin keramik. Penelitian ini membahas pola motif keramik menggunakan pengolahan citra digital dengan aplikasi digital. Desain motif keramik tersebut dibuat dengan pola simetris dari proses translasi, rotasi, refleksi, dan refleksi luncur. Tujuan penelitian ini adalah mengembangkan berbagai macam pola keramik dengan menerapkan grup simetris sebagai desain motif pada keramik. Aplikasi diharapkan dapat memudahkan para desainer untuk menemukan atau menciptakan desain-desain baru dari sebuah pola dasar atau yang biasa disebut pola satuan atau kisi satuan. Hasil yang didapat dari penelitian ini berupa 17 pola dari 17 grup simetri yang berasal dari satu pola dasar. Gabungan beberapa pola juga dibentuk dari grup simetri menjadi pola baru yang lebih bervariasi. Kata Kunci: Grup Simetris, Keramik, Kristalografi, Transformasi.

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Veloso, Carmen Lage. "DISEÑOS APOTROPAICOS. UN ENSAYO DE ANTROPOLOGÍA SIMÉTRICAApotropaic Designs. An Essay of Symmetrical Anthropology". Res Mobilis 9, nr 10 (16.01.2020): 170. http://dx.doi.org/10.17811/rm.9.10.2020.170-180.

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Algunos dispositivos retóricos han desempeñado, a lo largo de los tiempos, funciones de protección, advertencia, disuasión o fascinación. De fuerte componente abstracto, los patrones decorativos que se extienden por los paramentos, el mobiliario, los libros o los tejidos, se han relacionado, en numerosas ocasiones, con efectos apotropaicos. Como armas en potencia, estas sofisticadas trampas sirven indistintamente para la seducción y para la guerra.

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Fang, Kai-Tai, Yu Tang i Jianxing Yin. "Lower bounds for wrap-around L2-discrepancy and constructions of symmetrical uniform designs". Journal of Complexity 21, nr 5 (październik 2005): 757–71. http://dx.doi.org/10.1016/j.jco.2005.01.003.

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Gupta, Sudhir. "On block designs for symmetrical parallel line assays with even number of doses". Journal of Statistical Planning and Inference 21, nr 3 (marzec 1989): 383–89. http://dx.doi.org/10.1016/0378-3758(89)90054-2.

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Ceylan, Gülsüm, Gülsüm Sayın Özel, Gözde Memişoglu, Faruk Emir i Sevgin Şen. "Evaluating the Facial Esthetic Outcomes of Digital Smile Designs Generated by Artificial Intelligence and Dental Professionals". Applied Sciences 13, nr 15 (6.08.2023): 9001. http://dx.doi.org/10.3390/app13159001.

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This study evaluates the preference rates for smile designs created by professionals or by Artificial Intelligence (AI) among dentists, dentistry students, and laypeople. Four cases with symmetrical and asymmetrical features were selected based on the Facial Flow (FF) concept from the database of the Smile Designer app regarding anatomical facial points. Two smile designs were created for each selected case: one using Artificial Intelligence (AI) and one created manually. An online survey assessed participants’ preferences for the different smile designs. The chi-square test “Pearson’s and Fisher’s exact test (P)” was used to analyze the survey data. A total of 628 people completed the study. Dentists preferred the manually-created smile design for the first three cases. For Case 4, dentists who used the Smile Designer program preferred the manually-created design (55.88%), while those who did not use the program preferred the AI-generated design (55.84%). There was a significant difference in esthetic perception between dentists and dental students (p = 0.001) and between dentists and laypeople (p = 0.001) for Case 1, only between dentists and dental students (p = 0.003) for Case 2, and only between dentists and laypeople (p = 0.001) for Case 3. Furthermore, we found that females (p = 0.007) and orthodontists (p = 0.025) had a higher preference for the AI-generated design in this case compared to males and other dental specialties for Case 3. While age, education level, and clinical experience did not significantly impact dentists’ preference for manually-created or AI-generated smile designs (p > 0.05), our results suggest that there were some differences in preference for Case 3. Overall, our findings suggest that the use of AI-generated smile designs for symmetric faces is acceptable to both dentists and laypeople and can offer time-saving benefits for clinicians.

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Chang, Wen-Te. "On The 3D VR Simulated Rubik’s Cube Game for Smart Pads". Symmetry 14, nr 6 (9.06.2022): 1193. http://dx.doi.org/10.3390/sym14061193.

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In this study, interface designs of a VR 3D-simulated Rubik’s Cube game were developed and evaluated. A 2 × 2 × 2 mixed-design ANOVA was executed, with age (younger adult/older adult), interface (arrow/intuitive), and task complexity (easy, a single symmetrical task/difficult, a bio-symmetrical task) experimental design. The first three factors were between-subject designs while the latter was a within-subject design. The dependent variable was the percentage of the task performance and wayfinding questionnaire. The collected experimental data were analyzed by regression method to clarify the correlation among age, interface, task complexity, and wayfinding strategy. There were 96 subjects in the experiment, including 48 younger adults (aged from 18~22) and 48 older adults (aged from 60~85). The experimental results and statistical analysis showed that the task difficulty had a significant effect on task performance in the 3D VR Rubik’s Cube game. For the smart pad, the arrow interface was significantly more effective than the intuitive interface. The theoretical model regression analysis of the task complexity, interface, and wayfinding strategy was shown to be significant. Results showed that users may be affected either positively or negatively by the wayfinding strategy, as a higher score on familiarity indicates better VR game task performance, whereas for the usual spatial behavior wayfinding strategy, the opposite result was found for memory. These results can be used to assess VR game interface designs, taking into consideration age difference, task complexity, experiential self-report on 3D VR games, and including VR rotation navigational

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B, Sulochana. "Measure of Slope Rotatability for Second Order Response Surface Designs Under Tri-Diagonal Correlation Error Structure Using Symmetrical Unequal Block Arrangements with Two Unequal Block Sizes". International Journal for Research in Applied Science and Engineering Technology 9, nr VII (25.07.2021): 2409–24. http://dx.doi.org/10.22214/ijraset.2021.36827.

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In this paper, measure of slope rotatability for second order response surface designs using symmetrical unequal block arrangements with two unequal block sizes under tri-diagonal correlation error structure is suggested and illustrated with examples.

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Pesotan, H., i B. L. Raktoe. "On invariance and randomization in factorial designs with applications to D-optimal main effect designs of the symmetrical factorial". Journal of Statistical Planning and Inference 19, nr 3 (lipiec 1988): 283–98. http://dx.doi.org/10.1016/0378-3758(88)90037-7.

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Tirovic, M., i G. Ali. "Design synthesis of non-symmetrically loaded high-performance disc brakes Part 1". Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 215, nr 2 (1.03.2001): 101–9. http://dx.doi.org/10.1243/0954409011531431.

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Wheel-mounted disc brakes are exposed to severe non-symmetrical mechanical and thermal loads. The paper describes the design process for two high-performance, hub-mounted discs of different size and duty. The development has resulted in two very successful but fundamentally different hub designs and manufacturing methods. Initially, finite element analyses used in the design optimization were mainly concentrated on bulk thermal effects. Recently, in order further to improve the design process, analyses have included macro thermal effects, providing valuable results, particularly related to the prediction of disc permanent coning, one of the most critical design requirements.

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Noubiap, Roger Fandom, i Wilfried Seidel. "A minimax algorithm for constructing optimal symmetrical balanced designs for a logistic regression model". Journal of Statistical Planning and Inference 91, nr 1 (listopad 2000): 151–68. http://dx.doi.org/10.1016/s0378-3758(00)00137-3.

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Stoddard, J. E., D. J. Deehan, A. M. J. Bull, A. W. McCaskie i A. A. Amis. "No difference in patellar tracking between symmetrical and asymmetrical femoral component designs in TKA". Knee Surgery, Sports Traumatology, Arthroscopy 22, nr 3 (1.06.2013): 534–42. http://dx.doi.org/10.1007/s00167-013-2534-8.

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Vahedi, Zahra, Jamin Pelkey, Sari Park i Stéphanie Walsh Matthews. "Testing Symmetrical Knot Tracing for Cognitive Priming Effects Rules out Analytic Analogy". Symmetry 13, nr 1 (28.12.2020): 34. http://dx.doi.org/10.3390/sym13010034.

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Ritual knots are symmetrical crisscrossing designs that appear in distant cultures around the world. Their independent emergence is plausibly due to shared features of human cognition and experience that such patterns represent. Since empirical investigation of this possibility is lacking in the literature, our aim is to open up this research area. We do so by asking whether the cultural production and appreciation of ritual knots could be conditioned or motivated by alignments and affordances linked to creative human cognition—advanced analogical modeling processes that are themselves often discussed in terms of bidirectional blending and symmetrical mapping. If manual tracing of a traditional knot design had positive priming effects on such reasoning processes, as we hypothesize, this would suggest an explanatory link between the two. To begin testing this hypothesis, we selected a basic, traditional knot design from Tibet, along with three established measures of formal analogical reasoning and one original measure of syntactic preference involving reciprocal constructions. We then undertook a series of cognitive trials testing for potential cognitive benefits of manually tracing the design. We contrasted prime condition results with a control group and an anti-prime condition group. The data show observable effects of time across multiple measures but no significant effects of time or condition, controlling for reported mindfulness. While this rules out the short-term priming effects of enhanced analogical reasoning at the analytic level following brief manual tracing of this design, the research opens the way for further empirical experimentation on the nature and emergence of symmetrical knots and their potential relationships with patterns of human thought.

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Velasco, Carlos, Abhishek Pathak, Andy T. Woods, Andres Corredor i Andrew J. Elliot. "The relation between symmetry in food packaging and approach and avoidance words". Quarterly Journal of Experimental Psychology 73, nr 5 (19.11.2019): 654–63. http://dx.doi.org/10.1177/1747021819887172.

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Research on aesthetic science has demonstrated that people generally prefer symmetrical over asymmetrical compositions. However, it remains unclear whether and how such compositions relate to the concepts of approach and avoidance motivation, especially in consumer contexts. In addition, it is not known how symmetry may influence such concepts in contexts where objects can differ in terms of their hedonic values (symmetry/product taste congruency). In the present research, we evaluated the relation between visual symmetry of the packaging of products with different hedonic value (sweet, non-sweet, non-food) and approach and avoidance words. In two experiments, we found evidence that people associate symmetrical designs with approach words more often than asymmetrical designs. Importantly, however, we did not find evidence that such an effect is influenced by the hedonic value of the products. Our results have value for scholars and practitioners interested in the effect of aesthetic features of brand elements (such as a product’s packaging) on consumer motivation.

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Tang, Jun, Yudi Zhu, Wencong Gan, Haiming Mou, Jie Leng, Qingdu Li, Zhiqiang Yu i Jianwei Zhang. "Design, Control, and Validation of a Symmetrical Hip and Straight-Legged Vertically-Compliant Bipedal Robot". Biomimetics 8, nr 4 (1.08.2023): 340. http://dx.doi.org/10.3390/biomimetics8040340.

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This paper presents the development, modeling, and control of L03, an underactuated 3D bipedal robot with symmetrical hips and straight legs. This innovative design requires only five actuators, two for the legs and three for the hips. This paper is divided into three parts: (1) mechanism design and kinematic analysis; (2) trajectory planning for the center of mass and foot landing points based on the Divergent Component of Motion (DCM), enabling lateral and forward walking capabilities for the robot; and (3) gait stability analysis through prototype experiments. The primary focus of this study is to explore the application of underactuated symmetrical designs and determine the number of motors required to achieve omnidirectional movement of a bipedal robot. Our simulation and experimental results demonstrate that L03 achieves simple walking with a stable and consistent gait. Due to its lightweight construction, low leg inertia, and straight-legged design, L03 can achieve ground perception and gentle ground contact without the need for force sensors. Compared to existing bipedal robots, L03 closely adheres to the characteristics of the linear inverted pendulum model, making it an invaluable platform for future algorithm research.

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Takaoğlu, Faruk, Ali Alshahrani, Naim Ajlouni, Firas Ajlouni, Basil Al Kasasbah i Adem Özyavaş. "Robust Nonlinear Non-Referenced Inertial Frame Multi-Stage PID Controller for Symmetrical Structured UAV". Symmetry 14, nr 4 (26.03.2022): 689. http://dx.doi.org/10.3390/sym14040689.

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The design and implementation of a multi-stage PID (MS-PID) controller for non-inertial referenced UAVs are highly complex. Symmetrical multirotor UAVs are unstable systems, and it is thought that the kinematics of the symmetrical UAV rotor, such as the quadrotor and hexacopter resembles the kinematics of an inverted pendulum. Several researchers have investigated the structure and design of PID controllers for high-order systems during the last decade. The designs were always concerned with the enhanced response, robustness, model reduction and performance of PID controllers. An accurate tuning process of such a controller depends on the engineer’s experience level. This is due to the number of variables and hyperparameters tuned during the process. An adaptive genetic algorithm (AGA) is utilized to optimize the MS-PID controllers for controlling the quadrotor in this study. The proposed method optimizes the offline-planned approach, providing several possibilities for adapting the controllers with various paths and or varying weather conditions. The MS-PID parameters are optimized in parallel, as every PID controller affects the other controller’s behavior and performance. Furthermore, the proposed AGA generates new chromosomes for “new solutions” by randomly developing new solutions close to the previous best values, which will prevent any local minima solution. This study intends to investigate the design and development of a highly tuned robust multi-stage PID controller for a symmetrical multirotor UAV. The work presents a model for a non-referenced inertial frame multirotor UAV (quadcopter). Once the model is defined, a robust multi-stage PID controller for the non-inertial referenced frame symmetrical multirotor UAV is designed, tuned, and tested. A genetic algorithm (GA) will be used to tune the MS-PID controller. Finally, the performance comparison between the proposed and conventional methods is presented. The results show that the proposed method provides stability improvement, better transient response, and power consumption.

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Tamayo-Dominguez, Adrian, José-Manuel Fernández-González i Oscar Quevedo-Teruel. "Mechanically Reconfigurable Waveguide Filter Based on Glide Symmetry at Millimetre-Wave Bands". Sensors 22, nr 3 (27.01.2022): 1001. http://dx.doi.org/10.3390/s22031001.

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This paper presents the design and fabrication of a mechanically reconfigurable filter at W band based on the concept of glide symmetry. The tunability is achieved by breaking and regenerating the glide symmetry. The filters are made of two glide-symmetric pieces that can be displaced in a certain direction, and therefore, break the symmetry. The high filtering capacity of these designs is demonstrated by simulation and measurement and can also be adjusted mechanically. The transmission level in the manufactured filter varies from a value between −1 and −2 dB when the filter is in the glide symmetry position to values close to −40 dB in the stop-band when it is in the broken symmetry position. The transmission band obtained in the symmetrical mode is around 20%, but, after breaking the symmetry, it is split into two passbands of 6.5% and 11% separated by a stop-band of 6%. The position, bandwidth, filtering level and filter roll-off can be adjusted for both modes of operation by appropriately selecting the unit cell design parameters and the number of unit cells.

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Ji, Lina, i Wei Cheng. "Method of Bidirectional Green Wave Coordinated Control for Arterials under Asymmetric Release Mode". Electronics 11, nr 18 (8.09.2022): 2846. http://dx.doi.org/10.3390/electronics11182846.

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The existing coordinated control methods of green wave are complicated, difficult to operate and mainly applicable to intersection groups with symmetrical arriving upstream flows. Based on engineering practice, a new method of bidirectional progression green wave coordination control was presented by designing particular overlapping phases on the basis of NEMA dual-ring phasing configuration. Applying the characteristics of asymmetric release mode and the requirements of green wave coordinated control, the overall optimization designs of phase sequence combination and offset were carried out, and the influences of cruising speed and residual queues at red light on offset were considered, and then the classical bidirectional green wave graphic method was optimized. Based on the investigation data of the intersections group of Ziwu Road in Qujing City, bidirectional green wave designs were conducted under both symmetric and asymmetric release mode. The results show that the latter approach not only improved the bandwidth of bidirectional green wave band effectively, but also reduced the average delay and the average number of stops on the main road.

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Zhou, Xiaodong, Yunjuan Wang i Rongxian Yue. "Robust Optimum Life-Testing Plans under Progressive Type-I Interval Censoring Schemes with Cost Constraint". Symmetry 14, nr 5 (19.05.2022): 1047. http://dx.doi.org/10.3390/sym14051047.

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This paper considers optimal design problems for the Weibull distribution, which can be used to model symmetrical or asymmetrical data, in the presence of progressive interval censoring in life-testing experiments. Two robust approaches, Bayesian and minimax, are proposed to deal with the dependence of the D-optimality and c-optimality on the unknown model parameters. Meanwhile, the compound design method is applied to ensure a compromise between the precision of estimation of the model parameters and the precision of estimation of the quantiles. Furthermore, to make the design become more practical, the cost constraints are taken into account in constructing the optimal designs. Two algorithms are provided for finding the robust optimal solutions. A simulated example and a real life example are given to illustrate the proposed methods. The sensitivity analysis is also studied. These new design methods can help the engineers to obtain robust optimal designs for the censored life-testing experiments.

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Zhao, Haiqing, Guanghui Li i Junpeng Li. "Uniform Test on the Mixture Simplex Region". Symmetry 14, nr 7 (3.07.2022): 1371. http://dx.doi.org/10.3390/sym14071371.

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For the symmetrical mixture model and mixture test area, the lattice point set is used to partition, and then the corresponding test statistics can be constructed. In this paper, we first propose the partition methods under the lattice point sets and obtain several sub-simplexes without common interior points. Furthermore, we present a method for constructing a uniform design on the simplex using the center points of these sub-simplexes. The designs satisfy the uniformity of maximum distance deviation and provide good results for the mean square error deviation. Finally, the uniformity test on the mixture region is considered and illustrated by examples.

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Kenane, El Hadi, i Farid Djahli. "Optimum design of non-uniform symmetrical linear antenna arrays using a novel modified invasive weeds optimization". Archives of Electrical Engineering 65, nr 1 (1.03.2016): 5–18. http://dx.doi.org/10.1515/aee-2016-0001.

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Abstract This paper presents a new modified method for the synthesis of non-uniform linear antenna arrays. Based on the recently developed invasive weeds optimization technique (IWO), the modified invasive weeds optimization method (MIWO) uses the mutation process for the calculation of standard deviation (SD). Since the good choice of SD is particularly important in such algorithm, MIWO uses new values of this parameter to optimize the spacing between the array elements, which can improve the overall efficiency of the classical IWO method in terms of side lobe level (SLL) suppression and nulls control. Numerical examples are presented and compared to the existing array designs found in the literature, such as ant colony optimization (ACO), particle swarm optimization (PSO), and comprehensive learning PSO (CLPSO). Results show that MIWO method can be a good alternative in the design of non-uniform linear antenna array.

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Wen, C. Y., i H. T. Chang. "Design and Characterization of Valveless Impedance Pumps". Journal of Mechanics 25, nr 4 (grudzień 2009): 345–54. http://dx.doi.org/10.1017/s1727719100002835.

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ABSTRACTThis study designs, fabricates and characterizes three valveless impedance pumps, namely a symmetrical pump with a circular cross-section, an asymmetrical pump with a circular cross-section, and an asymmetrical pump with a rectangular cross-section. The pressure head and flow rate characteristics of the three pumps are investigated as a function of the compression location, the compression frequency and the compression amplitude. The experimental results show that the flow is reversible in every case. Moreover, the pressure head is found to be significantly dependent on the actuating frequency, the compression location and the compression amplitude. However, no pressure head is produced when the pinching effect is applied at the center of channel configuration for the symmetrical pump. In the symmetrical pump, a maximum pressure head of 590mm is obtained at a frequency of 26Hz, and results in a flow rate of 0.581/min in the positive direction (i.e. from the left-hand reservoir of the pump to the righthand reservoir). Meanwhile, in the asymmetrical pumps with circular and rectangular cross-sections, respectively, maximum pressure heads of −620mm and −570mm are developed at frequencies of 36Hz and 32Hz, respectively. The corresponding flow rates are determined to be 0.641/min and 0.531/min, respectively. In both cases, the fluid moves in the negative direction (i.e. from the right-hand reservoir of the pump to the left-hand reservoir). Overall, the valveless impedance pumps developed in this study generate a high pumping rate, are easily fabricated and have no moving mechanical valves. As a result, they are eminently suitable for pumping applications in such diverse systems as biomedical devices, fuel cells, PC cooling systems, and so forth.

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Chen, Zhi Yuan, Shao Bin Huang, Lin Shan Shen i Shuai Yang. "A New Approach of Distributed Query Processing Based on Database Grid". Applied Mechanics and Materials 328 (czerwiec 2013): 248–53. http://dx.doi.org/10.4028/www.scientific.net/amm.328.248.

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Distributed query processing technology is a difficult problem of data query, at the moment, the research and result of the query processing technology which is in view of grid environment is seldom. On the basis of the current grid standard and technology and aiming at the research of distributed relation join algorithm which adapts to grid environment, the paper designs the relevant solutions, achieves the efficient distributed query processing. For the characteristics of database grid, come up with the algorithm of relation join operation in database grid-symmetrical same-ordered semi-join algorithm, this algorithm can reduces the cost of communication and improves the parallelism, and is suitable for multi-join; Second, for the algorithm characteristics, researching the relevant SQL query processing method in order to generates efficient execution plan of symmetrical same-ordered semi-join algorithm.

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Xiao, Gaobiao, Ting Zang i Rui Liu. "Synthesis of Non-Mirror-Symmetrical Far-Field Patterns Using Two Parallel Current Sheets". Electronics 12, nr 4 (9.02.2023): 892. http://dx.doi.org/10.3390/electronics12040892.

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This paper shows that the radiation patterns and polarizations on the two sides of the source plane can be controlled separately if two parallel current sheets are used. An efficient algorithm is proposed to determine the propagation components of the currents on the two sheets directly from the specified radiation pattern. Numerical examples demonstrate that the algorithm is effective for synthesizing radiation patterns with complex footprints and beam-wise polarizations. Although the resultant continuous current distribution is not easy to implement in practical applications, it provides a useful base for further designs. If proper feeding techniques are developed, it will also be possible to spatially sample the continuous current distribution and realize the radiation pattern with large scale antenna arrays.

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Gimpilevich, Yu, I. Afonin, V. Vertegel i Yu Tyschuk. "Technical realization of the device for integrated monitoring of the parameters of the microwave path". Journal of Physics: Conference Series 2094, nr 3 (1.11.2021): 032040. http://dx.doi.org/10.1088/1742-6596/2094/3/032040.

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Abstract Two designs of a microwave sensor have been developed for a device for built-in monitoring of microwave path parameters, built on the basis of a broadband quadrature measurement method. The first sensor design is made on the basis of a symmetrical strip line, the second - on the basis of a segment of a coaxial line. Each of the microwave sensor designs consists of three parts: a directional coupler and two non-directional measuring probes. The microwave sensor is designed to operate in the 1 - 2 GHz frequency range. The paper also proposes a variant of the circuitry implementation of the built-in microwave control device, which implements the procedure for broadband automatic measurement of the complex reflection coefficient and the power level in the microwave path based on the method of quadrature measurements. The device solves the problem of long-term automatic monitoring of parameters and timely detection of the beginning degradation of the antenna-feeder path.

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Chiranjeevi, P. "Second Order Rotatable Designs of Second Type using Symmetrical Unequal Block Arrangements with Two Unequal Block Sizes". International Journal for Research in Applied Science and Engineering Technology 9, nr 2 (28.02.2021): 515–25. http://dx.doi.org/10.22214/ijraset.2021.33139.

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Marcinkiewicz, Jacek, Mikołaj Spadło, Zaneta Staszak i Jarosław Selech. "Shaping the Design Features of a Dynamometer for Measuring Resistance Biaxial Components of Symmetrical Coulters". Sensors 22, nr 1 (30.12.2021): 272. http://dx.doi.org/10.3390/s22010272.

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The article lays out the methodology for shaping the design features of a strain gauge transducer, which would make it possible to study forces and torques generated during the operation of symmetrical seeder coulters. The transducers that have been known up until now cannot be used to determine forces and torques for the coulter configuration adopted by the authors. For this purpose, the design of the transducer in the form of strain gauge beams was used to ensure the accumulated stress concentration. A detailed design was presented in the form of a 3D model, along with a transducer body manufactured on its basis, including the method for arranging the strain gauges thereon. Moreover, the article discusses the methodology of processing voltage signals obtained from component loads. Particular attention was paid to the methodology of determining the load capacity of the transducer structure, based on finite element method (FEM). This made it possible to choose a transducer geometry providing the expected measurement sensitivity and, at the same time, maintaining the best linearity of indications, insignificant coupling error, and a broad measurement range. The article also presents the characteristics of the transducer calibration process and a description of a special test stand designed for this purpose. The transducer developed within the scope of this work provides very high precision of load spectrum reads, thus enabling the performance of a detailed fatigue analysis of the tested designs. Additionally, the versatility it offers makes it easy to adapt to many existing test stands, which is a significant advantage because it eliminates the need to build new test stands.

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Bujakas, V. I. "Shape Control and Kinematic Waves in Large Statically Determinate Structures in Space". International Journal of Space Structures 13, nr 1 (marzec 1998): 13–22. http://dx.doi.org/10.1177/026635119801300102.

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Statically determinate designs are free of thermal stress, their assembly is possible with small efforts and static shape control by changing members length with small forces is available. For these reasons large statically determinate structures can be proposed as promising candidates for various space projects. Large one-dimensional linear, axially-symmetrical, and two-dimensional statically determinate controllable structures are developed and analyzed. Kinematic waves arising during static shape control are found and described. Algorithms of shape control are proposed.

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