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design algorithms for contemporary pattern-based building envelopes

AIN SHAMS ENGINEERING JOURNAL 2024年第5期15卷

作者： Saeid, Anfal Y. Al-kazzaz, Dhuha A. Univ Mosul Dept Architecture Engn Mosul Iraq

Pattern -based building envelope is a modern style of contemporary facades. Architects may rely on imitating known practices without knowing the processes involved in their design. Therefore, this paper seeks to identify the algorithmic steps implemented in the derivation of contemporary fa & ccedil;ade. The design algorithms of patternbased building envelopes are classified into generative algorithms of the basic pattern and elements, and transformation algorithms. An experimentation method was applied using Grasshopper for Rhino to simulate the formation of nine contemporary pattern -based envelopes. The finding reveals that several approaches are implemented such as elements are extruded from the basic pattern or separated from it. The envelope pattern may result from repeting the elements, or the envelope pattern may be devoid of elements. Modification techniques can manipulate the basic pattern, the elements, or both patterns and elements. They act on the patterns and elements simultaneously in the same way, or separately using different ways.

关键词： Pattern Building envelope Fa & ccedil ade design algorithms Digital design

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Systematic Behavioral design algorithms

Systematic Behavioral Design Algorithms

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2023 Congress in Computer Science, Computer Engineering, and Applied Computing, CSCE 2023

作者： Simmonds, Devon M. University of North Carolina Wilmington WilmingtonNC United States

ISBN: (纸本)9798350327595

algorithms to support systematic software design are needed to enable practitioners to mechanize and coherently manage the engineering of quality software. In practice, design is both an art and a science, and this dichotomy has led some to under-focus on the science and engineering side of software development. In our previous research, we presented a design algorithm for structural design focused on UML use case and requirements class diagrams. In this paper we shift focus to systematic behavioral design algorithms illustrated by UML state and activity diagrams. We present the systematic behavioral design algorithms, their application to a specific case study, as well as contingent results, implications, and lessons learned. © 2023 IEEE.

关键词： design algorithms low-code model driven engineering software design software engineering

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Advancements and challenges in the design and implementation of tensegrity networks of zero mean curvature

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MECCANICA 2025年第3期60卷 709-721页

作者： Liapi, Katherine A. Papantoniou, Andreana Univ Patras Dept Architecture Univ Campus Patras 26504 Greece

The research on tensegrity structure for architectural applications, has been intricately tied to the advancement of both lightweight conventional and temporary structures. The morphological exploration of tensegrity structures is expected to significantly contribute to their application in the fields of building design and construction. This paper is focused on novel configurations of double layer tensegrity networks the two layers of which are minimal surfaces. These minimal surface tensegrity structures that can be defined as zero mean curvature tensegrity networks, constitute a novel category that presents significant advantages in their practical application. The investigation of the geometric properties of these networks/structures has resulted in a set of algorithms that address distinct configurations of tensegrity structures the two layers of which are of helical, catenoid or enneper shape. These algorithms were applied and tested in the process of designing and constructing tensegrity structures with the aforementioned characteristics. For the implementation of the algorithms, a method that permits the construction of double layer tensegrity structures from the assembly of collapsible tensegrity units was employed. Case studies of space enclosure or space covering zero mean curvature tensegrity networks that utilize all developed algorithms and processes, and the way spatial constraints and constructability challenges were addressed, are presented and discussed in the paper. The realization of these structures has substantiated the validity of the algorithms, and the challenges encountered provide valuable insights for refining both the design algorithms and the methods employed in construction and assembly.

关键词： Tensegrity structures Minimal surfaces Surfaces of zero mean curvature Enneper Helicoid Catenoid design algorithms Tensegrity construction

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Digital Engineering in Diffractive Optics for Precision Laser Processing

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PHOTONICS 2025年第4期12卷 306-306页

作者： Murzin, Serguei P. TU Wien Karlspl 13 A-1040 Vienna Austria Samara Natl Res Univ Moskovskoe Shosse 34 Samara 443086 Russia

This article focuses on the application of digital engineering in diffractive optics for precision laser material processing. It examines methods for the development of diffractive optical elements (DOEs) and adaptive management approaches that enhance the accuracy and efficiency of laser processing. Key achievements are highlighted in numerical modeling, machine learning applications, and geometry optimization of optical systems, along with the integration of dynamic DOEs with laser systems for adaptive beam control. The discussion includes the development of complex diffractive structures with improved characteristics and new optimization approaches. Special attention is given to the application of DOEs in micro- and nanostructuring, additive manufacturing technologies, and their integration into high-performance laser systems. Additionally, challenges related to the thermal stability of materials and the complexity of adaptive DOE control are explored, as well as the role of artificial intelligence in enhancing laser processing efficiency.

关键词： diffractive optical elements laser material processing digital engineering design algorithms numerical modeling beam shaping adaptive control energy redistribution spatial light modulators system integration

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Image encryption using a combination of Grain-128a algorithm and Zaslavsky chaotic map

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IET IMAGE PROCESSING 2020年第6期14卷 1120-1131页

作者： Balaska, Nawel Ahmida, Zahir Belmeguenai, Aissa Boumerdassi, Selma Univ 20 Aout 1955 Skikda Lab Rech Elect Skikda BP 26 Skikda 21000 Algeria Conservatoire Natl Arts & Metiers 292 Rue St Martin F-75141 Paris 03 France

Encryption is a very important way to secure data in storage and communication, and it is a process of encoding messages or information in such a manner that only authorised persons can access it. Different techniques are used to protect confidential image data against illicit access. In image encryption using chaotic systems, most authors use or design algorithms to generate the initial parameters' values from the secret key. However, as the key size depends on the number of these parameters, the used algorithms show little sensitivity to small changes in the key. To enhance both security and sensitivity in the choice of the initial parameters, this work combines the use of the Grain-128a stream cipher algorithm with two-dimensional Zaslavsky chaotic map. Firstly, the Grain-128a algorithm is applied to generate the required parameters of Zaslavsky's chaotic map from a fixed length 256-bit secret key. Secondly, the sequences generated by the chaotic map are used to encrypt the image using a bit confusion and diffusion process. The simulation results on greyscale, colour, binary, indexed, and medical images together with the scores obtained in the evaluation of the algorithm show that the proposed method is very sure and effective in encrypting images of any size and any type.

关键词： chaos cryptography image sequences image coding data protection image encryption chaotic systems design algorithms secret key two-dimensional Zaslavsky chaotic map bit confusion diffusion process medical images grain-128a algorithm encoding message process confidential image data protection grain-128a stream cipher algorithm fixed length 256-bit secret key current 128 0 A

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Transceiver design for multiple-input multiple-output full-duplex amplify-and-forward relay communication systems

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IET COMMUNICATIONS 2019年第1期13卷 66-73页

作者： Shao, Yunlong Dai, Yongyu Gulliver, Thomas Aaron Dong, Xiaodai Univ Victoria Dept Elect & Comp Engn POB 1700 STN CSC Victoria BC V8W 2Y2 Canada

This study examines the linear source and relay precoder and destination combiner design for multiple-input multiple-output full-duplex (FD) relay communication systems. The effect of the residual interference due to the imperfect loop interference cancellation is considered in the design. Two design algorithms are proposed to minimise the mean squared error of the received signal at the destination. The first is a tri-step alternating iterative algorithm while the second is a bi-step iterative algorithm, which has lower complexity and performance comparable to that of the first algorithm. The convergence of these algorithms is evaluated. Results are presented, which show that the proposed FD relay system can provide approximately double the achievable rate of the corresponding half-duplex system if the residual interference is not high.

关键词： MIMO communication amplify and forward communication relay networks (telecommunication) interference suppression radio transceivers radiofrequency interference iterative methods precoding transceivers transceiver design full-duplex amplify- relay communication systems -forward relay communication systems linear source relay precoder residual interference imperfect loop interference cancellation design algorithms mean squared error received signal tri-step alternating bi-step iterative algorithm lower complexity FD relay system corresponding half-duplex

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The Taylor-Couette Disc Contactor

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CHEMICAL ENGINEERING & TECHNOLOGY 2016年第11期39卷 2087-2095页

作者： Grafschafter, Annika Aksamija, Enes Siebenhofer, Matthaeus Graz Univ Technol NAWI Graz Inst Chem Engn & Environm Technol Inffeldgasse 25C A-8010 Graz Austria

The Taylor-Couette disc contactor is a hydrodynamic hybrid of a rotating disc contactor and a Taylor-Couette contactor. For application in reactive bioseparations, this type of liquid-liquid contactor may offer advantageous operation features. This paper summarizes the design characteristics of the Taylor-Couette disc contactor. For hydrodynamic characterization, experimental data of the mean Sauter diameter and dispersed-phase hold-up were compared with results predicted by empirical correlations, which were originally developed for rotating disc contactors. Several correlations were modified for the application on Taylor-Couette disc contactors. Operation characteristics have been deduced from mass-transfer experiments on the pilot-plant scale.

关键词： design algorithms Hydraulic correlations Reactive separations Separation efficiency Taylor-Couette disc contactor

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Privacy sets for constrained space-filling

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JOURNAL OF STATISTICAL PLANNING AND INFERENCE 2016年 171卷 1-9页

作者： Benkova, Eva Harman, Radoslav Mueller, Werner G. Comenius Univ Dept Appl Math & Stat Bratislava Slovakia Johannes Kepler Univ Linz Dept Appl Stat Linz Austria

Utilizing a typology for space filling into what we call "soft" and "hard" methods, we introduce the central notion of "privacy sets" for dealing with the latter. This notion provides a unifying framework for standard designs without replication, Latin hypercube designs, and Bridge designs, among many others. We introduce a heuristic algorithm based on privacy sets and compare its performance on some well-known examples. For instance, we demonstrate that for the computation of Bridge designs this algorithm performs significantly better than the state-of-the-art method. Moreover, the application of privacy sets is not restricted to cuboid design spaces and promises improvements for many other situations. (C) 2015 The Authors. Published by Elsevier B.V.

关键词： Computer experiments design algorithms Optimal design

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design And Implementation Of Controllers For Contactless Power Transfer On FPGA 9

Design And Implementation Of Controllers For Contactless Pow...

引用

9th Int Conf Ind Information Syst (ICIIS2014)

作者： Khan, Patan Imran Kumar, Praveen Trivedi, Gaurav Indian Inst Technol Guwahati Dept Elect & Elect Engn Gauhati India

ISBN: (纸本)9781479964994

In this paper, design algorithms for implementing controllers for DC to AC converter and DC to DC converter using Field Programmable Gate Arrays (FPGA) are presented. We used DC to AC converter proposed in [1], which uses free oscillation and discrete energy injection technology for our experiments. For DC to DC converter, Cuk converter [2] was used in our experiments. The controller of DC to AC converter for different values of capacitors, for minimum switching losses on FPGA has been tested satisfactorily. The controller for DC to DC converter, to set the output voltage to a reference voltage irrespective of the input voltages has also been tested successfully.

关键词： DC-AC power convertors DC-DC power convertors field programmable gate arrays Cuk converter DC-AC converter DC-DC converter FPGA capacitors contactless power transfer controllers design algorithms minimum switching losses Field programmable gate arrays Generators Logic gates MOSFET Radiation detectors Software packages Voltage control Field programmable gate arrays DC-DC power convertors AC to DC converters Controllers AC converter Radiation detectors Software packages Capacitors Voltage regulation Logic gates power transfer direct current DC converter dynamos metal-oxide-semiconductor field effect transistors

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Analysis and design of a modular underactuated mechanism for robotic fingers

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2012年第C1期226卷 242-256页

作者： Yao, S. Ceccarelli, M. Zhan, Q. Carbone, G. Lu, Z. Univ Cassino LARM Lab Robot & Mechatron I-03043 Cassino Fr Italy Beihang Univ Sch Automat Sci & Elect Engn Beijing Peoples R China Beihang Univ Inst Robot Beijing Peoples R China

This paper presents an analysis of the design problems and requirements for underactuated mechanisms for robotic fingers. The case of performing a grasping task is considered and a solution is proposed that consists of a series of linked underactuated mechanisms. Optimality criteria are analysed with the aim of formulating a general design algorithm based on a suitable optimization problem. An example of a four-phalanx modular finger is used to highlight the practical feasibility of the proposed modular design concepts and procedures.

关键词： robotic fingers modular design underactuated mechanisms design algorithms optimality criteria

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