Using very large scale integrated optics (VLSIO) to create high-complexity optoelectronic components

1996 ◽  
Author(s):  
Lawrence C. West ◽  
Charles W. Roberts ◽  
Emil C. Piscani ◽  
Madan Dubey ◽  
Kenneth A. Jones ◽  
...  
Keyword(s):  
Integrated Optics ◽  
Large Scale ◽  
High Complexity

Three-dimensional packaging of very large scale integrated optics (VLSIO) for high-complexity optical systems

1996 ◽  
Author(s):  
Lawrence C. West ◽  
Charles W. Roberts ◽  
Emil C. Piscani ◽  
Madan Dubey ◽  
Kenneth A. Jones ◽  
...  
Keyword(s):  
Integrated Optics ◽  
Large Scale ◽  
Three Dimensional ◽  
Optical Systems ◽  
High Complexity

scholarly journals On the Root Causes of the Fukushima Daiichi Disaster from the Perspective of High Complexity and Tight Coupling in Large-Scale Systems

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 414
Author(s):  
Atsuo Murata ◽  
Waldemar Karwowski
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Large Scale ◽  
High Complexity ◽  
Tight Coupling ◽  
Large Scale Systems ◽  
Safety Issues ◽  
Loss Of Coolant ◽  
Station Blackout ◽  
Fukushima Daiichi

This study explores the root causes of the Fukushima Daiichi disaster and discusses how the complexity and tight coupling in large-scale systems should be reduced under emergencies such as station blackout (SBO) to prevent future disasters. First, on the basis of a summary of the published literature on the Fukushima Daiichi disaster, we found that the direct causes (i.e., malfunctions and problems) included overlooking the loss of coolant and the nuclear reactor’s failure to cool down. Second, we verified that two characteristics proposed in “normal accident” theory—high complexity and tight coupling—underlay each of the direct causes. These two characteristics were found to have made emergency management more challenging. We discuss how such disasters in large-scale systems with high complexity and tight coupling could be prevented through an organizational and managerial approach that can remove asymmetry of authority and information and foster a climate of openly discussing critical safety issues in nuclear power plants.

scholarly journals Order reduction of hierarchical interconnected dynamical systems

2018 ◽  
Vol 16 ◽  
pp. 89-97
Author(s):  
Michael Popp ◽  
Wolfgang Mathis
Keyword(s):  
Large Scale ◽  
Piecewise Linear ◽  
Hierarchical Structures ◽  
Order Reduction ◽  
System Structure ◽  
High Complexity ◽  
Interconnected System ◽  
Nonlinear Dynamical ◽  
Modern Engineering ◽  
Large Systems

Abstract. The simulation of large scale nonlinear dynamical interconnected systems, as they arise in all modern engineering disciplines, is a usual task. Due to the high complexity of the considered systems, the principle of thinking in hierarchical structures is essential and common among engineers. Therefore, this contribution proposes an approach for the numerical simulation of large systems, which keeps the hierarchical system structure alive during the entire simulation process while simultaneously exploiting it for order reduction purposes. This is accomplished by embedding the trajectory piecewise linear order reduction scheme in a modified variant of the component connection modeling for building interconnected system structures. The application of this concept is demonstrated by means of a widely used benchmark example and a modified variant of it.

Large-scale integrated optics using TriPleX waveguide technology: from UV to IR

2009 ◽  
Author(s):  
René Heideman ◽  
Arne Leinse ◽  
Willem Hoving ◽  
Ronald Dekker ◽  
Douwe Geuzebroek ◽  
...  
Keyword(s):  
Integrated Optics ◽  
Large Scale

scholarly journals Universal Service Systems for Scalable Copper Packaging of Discrete Circuit Components

2021 ◽  
Vol 15 ◽  
pp. 1744-1750
Author(s):  
Shuh-Ping Sun ◽  
Jerry Hu
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Service System ◽  
Copper Substrate ◽  
Universal Service ◽  
Core Material ◽  
High Complexity ◽  
Semiconductor Chip ◽  
Bonding Density ◽  
Circuit Components

In the decade of digital electronics, no matter what type is, high-value, high-complexity, high-performance devices (such as the main microprocessor core in smart phones) is undoubtedly crucial. However, simple discrete circuit components (such as capacitors, resistors, diodes, transistors, etc.) are also essential for mobile phones. In order to continue to increase functionality and reliability, reduce size and power consumption, reduce costs, and any function we seek in electronic equipment, there is always the basic principle of squeezing everything onto the same semiconductor chip. However, in some unavoidable situations, not all circuit components can run on the same chip. This service system uses a copper substrate as the core material for packaging, and can package chips with high bonding density. It provides a universal service platform for packaged products called: Scalable Universal Copper-based Packaging (CopperPak) service system. This service system is attributed to copper-based packaging (CopperPak) as a solution for expansion packaging, which can package the chip on the multifunctional component as much as possible. Scalable universal copper-based packaging (CopperPak) service system, including miniature copper-based packaging (TyniCopk) and large-scale copper-based packaging (MassyCopk) modules, used to package discrete circuit components, not only solve the discrete circuit components size, heat transfer and positioning alignment issues, and simplify the packaging process and improve yield rate.

scholarly journals Large-Scale Evolutionary Strategy Based on Gradient Approximation

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jin Jin
Keyword(s):  
Covariance Matrix ◽  
Large Scale ◽  
Experimental Results ◽  
Test Suite ◽  
Evolutionary Strategy ◽  
Large Scale Optimization ◽  
Next Generation ◽  
High Complexity ◽  
Historical Information ◽  
Scale Optimization

For large-scale optimization, CMA-ES has the disadvantages of high complexity and premature stagnation. An improved CMA-ES algorithm called GI-ES was proposed in this paper. For the problem of high complexity, the method in this paper replaces the calculation of a covariance matrix with the modeling of expected fitting degrees for a given covariance matrix. At the same time, to solve the problem of premature stagnation, this paper replaces the historical information of elite individuals with the historical information of all individuals. The information can be seen as approximate gradients. The parameters of the next generation of individuals are generated based on the approximate gradients. The experimental results were tested using CEC 2010 and CEC2013 LSGO benchmark test suite, and the experimental results verified the effectiveness of the algorithm on a number of different tasks.

Combined denitrification and phosphorus removal in a biofilter

2000 ◽  
Vol 41 (4-5) ◽  
pp. 493-501 ◽  
Author(s):  
C.M. Falkentoft ◽  
P. Harremoës ◽  
H. Mosbæk ◽  
P. Wilderer
Keyword(s):  
Phosphorus Removal ◽  
Large Scale ◽  
Phosphate Uptake ◽  
Computer Control ◽  
Batch Experiments ◽  
High Complexity ◽  
Biofilm Thickness ◽  
Uptake Rates ◽  
On Line ◽  
Insight Into

A lab-scale biofilter was run continuously for 1½ years for combined denitrification and phosphorus removal. lternation between anaerobic and anoxic (nitrate) conditions was used to obtain an enriched culture of denitrifying, phosphate accumulating organisms. Batch experiments were performed to test the importance of diffusion and zonation in the biofilm. Half- and zero-order anaerobic phosphate release and anoxic phosphate uptake rates were verified, which was taken as an indication of a zonated biofilm. To investigate the practical applicability of the process, the development of a computer model is necessary due to the high complexity of the process. AQUASIM is suitable for this purpose. The model can provide insight into what goes on inside the biofilm and act as a tool when predicting required tank sizes, optimal phase lengths and biofilm thickness etc. for a large-scale system. For control of the process, on-line measurements and computer control of the system are essential.

scholarly journals Multidimensional quantum entanglement with large-scale integrated optics

Science ◽  
2018 ◽  
Vol 360 (6386) ◽  
pp. 285-291 ◽  
Author(s):  
Jianwei Wang ◽  
Stefano Paesani ◽  
Yunhong Ding ◽  
Raffaele Santagati ◽  
Paul Skrzypczyk ◽  
...  
Keyword(s):  
Quantum Entanglement ◽  
Integrated Optics ◽  
Large Scale

Germanium waveguide for optical interconnects in very large scale integrated optics

1996 ◽  
Author(s):  
Madan Dubey ◽  
Richard T. Lareau ◽  
Melanie W. Cole ◽  
Kenneth A. Jones ◽  
Lawrence C. West ◽  
...  
Keyword(s):  
Integrated Optics ◽  
Optical Interconnects ◽  
Large Scale

scholarly journals Beyond dipolar Huygens’ metasurfaces for full-phase coverage and unity transmittance

Nanophotonics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Aso Rahimzadegan ◽  
Dennis Arslan ◽  
David Dams ◽  
Achim Groner ◽  
Xavi Garcia-Santiago ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Integrated Optics ◽  
Theoretical Basis ◽  
Large Scale ◽  
Rotational Symmetry ◽  
Resonant Wavelength ◽  
Identical Particles ◽  
Duality Symmetry ◽  
Wavelength Scale

AbstractMetasurfaces made from densely packed resonant wavelength-scale particles enable abrupt modulation of impinging electromagnetic radiation within an ultrathin surface. Combining duality symmetry of particles and rotational symmetry of their arrangement led to the development of Huygens’ metasurfaces with perfect transmission. However, so far, when identical particles are considered, only their dipolar multipolar contributions are engineered. There, the achievable phase coverage at a fixed wavelength when modifying the period is smaller than 2π, being a clear limitation for applications. To lift such limitation, we consider dipolar-quadrupolar Huygens’ metasurfaces. They consist of scatterers that require a dipolar and a quadrupolar term to capture their response. We show that such metasurfaces offer access to the desired 2π phase coverage while preserving the perfect efficiency when the conditions of duality and symmetry continue to be met. We also propose core-multishell and disk-multiring particles made from realistic materials to meet the requirements and that can be used to build such metasurfaces. Our results are important as a theoretical basis for large-scale fabrications in imaging and integrated optics.

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