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1
Content available Design and optimisation of a cascaded RI-MMI-based 2 × 4 quadrature phase and power splitter with integrated thermo-optic phase shifters
Thanh Thuy Tran Thi, Nguyen Tan Hung, Cao Dung Truong
Opto-Electronics Review
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2025
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Vol. 33, No. 4
art. no. e157330
EN
In this study, we present the design and optimisation of a 2 × 4 quadrature phase and power splitter based on cascaded restricted interference-multimode interference (RI-MMI) couplers integrated with thermo-optic phase shifters on a silicon photonic platform. The device operates in the RI regime to achieve a compact, efficient configuration. The proposed circuit consists of two cascaded 2 × 2 RI-MMI couplers with integrated Ti-based heaters enabling precise thermo-optic phase control and switching capability. Numerical simulations using the 3D beam propagation method (BPM) show that the splitter performs effectively across a broad wavelength range of 1.5-1.6 μm, with an excess loss of approximately 0.2 dB at the central wavelength. The four output ports exhibit well-balanced power distribution, with a maximum deviation of about 15 dB, and maintain stable 90° phase differences among the outputs. The device also demonstrates robust thermal stability and tolerance to fabrication errors up to ± 1 nm, ensuring consistent optical performance. These findings highlight the strong potential of the proposed device for advanced optical signal processing applications such as quadrature phase-shift keying (QPSK) modulators, multicarrier phase-coded orthogonal frequency-division multiplexing (OFDM) systems, optical phasors, and multiphase local oscillators, providing a robust, high-precision platform that operates reliably across multiple wavelength bands.
2
Content available 3D-BPM simulation design of a compact 3-dB optical power splitter using a 2 × 2 RI-MMI coupler on silicon waveguide
Thanh Thuy Tran Thi, Trung Hien Nguyen, Nguyen Tan Hung, Cao Dung Truong
Opto-Electronics Review
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2025
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Vol. 33, No. 3
art. no. e155674
EN
Multimode interference (MMI) waveguides are favoured for their wide bandwidth, extensive fabrication tolerance, high stability, effective light confinement, and minimal transmission loss. In this study, the authors propose a numerical design of an optical power splitter based on restricted interference (RI) mechanisms using silicon-on-insulator waveguides, where the precise positioning of input pairs and subsequent adjustment of the MMI region length are essential aspects. The RI-MMI configuration facilitates the reduction of the MMI length due to the applied interference theory. The authors’ design undergoes a rigorous simulation and optimization using a highly accurate three-dimensional beam propagation method (3D-BPM) simulation method to ensure optimal performance. Simulation results confirm the authors high-performance design with low excess loss (< 2.7 dB), small relative phase difference (< 2%), negligible residual (< -18 dB), excellent coupling ratio (- 0.09 dB to 0.05 dB), and high balance factor (< - 17 dB) across the wide range of 100 nm (1500 nm–1600 nm). Furthermore, the authors’ optimized design exhibits a width tolerance of ± 2.1 μm and a height tolerance of ± 10 nm. Notably, the core component of the splitter is housed within an extremely compact footprint area of 6 μm × 65 μm. These exceptional characteristics position the authors’ proposed device as highly promising for large-scale integrated optical circuits, as well as photonic neural networks in ultrawideband telecom applications.
3
Content available Quality Information and Quality Performance: Roles of Process Control as a Mediator and Shop Floor Leadership as a Moderator
Anh Nguyen Ngoc, Phan Anh Chi, Thoa Pham Thi Xuan, Matsui Yoshiki
Management and Production Engineering Review
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2021
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Vol. 14, No. 4
13--26
EN
This study investigates (1) the effect of quality information on quality performance through process control and (2) the moderating role of shop floor leadership on the relationship between quality information and quality performance in the context of manufacturing plants on a global basis. The moderated mediation analysis with a bootstrapping approach was employed to analyse data for hypotheses testing. The data is from the fourth-round dataset of the High- Performance Manufacturing Project, collected from manufacturing plants worldwide. The results indicate that (1) quality information is positively associated with quality performance through process control, and (2) shop floor leadership (i.e., supervisory interaction facilitation) positively moderates the indirect effect of quality information on quality performance; that is, the shop floor leadership practice strengthens the effect of quality information on quality performance through process control. This study also has a practical implication for top managers who should consider the vital role of leadership practices adopted by shop floor supervisors in implementing total quality management practices and should raise awareness that leadership practices are not only for the ‘C-suite’ but also for shop floor supervisors.
4
Content available Analysis of High-Performance Near-threshold Dual Mode Logic Design
Bikki Pavankumar
International Journal of Electronics and Telecommunications
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2019
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Vol. 65, No. 4
723--729
EN
A novel dual mode logic (DML) model has a superior energy-performance compare to CMOS logic. The DML model has unique feature that allows switching between both modes of operation as per the real-time system requirements. The DML functions in two dissimilar modes (static and dynamic) of operation with its specific features, to selectively obtain either low-energy or high-performance. The sub-threshold region DML achieves minimum-energy. However, sub-threshold region consequence in performance is enormous. In this paper, the working of DML model in the moderate inversion region has been explored. The near-threshold region holds much of the energy saving of subthreshold designs, along with improved performance. Furthermore, robustness to supply voltage and sensitivity to the process temperature variations are presented. Monte carol analysis shows that the projected near-threshold region has minimum energy along with the moderate performance.
5
Content available remote The influence of coarse aggregate shape on the properties of high-performance, self-compacting concrete
Ostrowski K.
Technical Transactions
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2017
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Vol. 5(114)
25--33
EN
High-performance, self-compacting concrete (HPSCC) represents a very significant step in the development of concrete technology. The most important features of SCC are specific rheological properties which include flowability, segregation resistance and passing ability. Therefore, a crucial requirement is to maintain an appropriate balance between the slump flow and plastic viscosity of concrete mixtures. In general, the rheological properties are modified by effective superplasticisers and a proper ratio of water to binder. The aim of this study is to focus on the important aspect of the impact of shape of the coarse aggregate on fresh concrete mixture properties and the strength of high-performance, self-compacting concrete (HPSCC).
PL
Samozagęszczalny beton wysokowartościowy stanowi bardzo istotny krok w rozwoju technologii betonu. Najistotniejszą cechą betonu samozagęszczalnego są specyficzne właściwości reologiczne mieszanki, do których zaliczamy płynność, stabilność i zdolność do przepływu przez zbrojenie. Bardzo ważne jest więc zachowanie odpowiedniego balansu pomiędzy granicą płynięcia a lepkością plastyczną mieszanki. Na ogół właściwości reologiczne są modyfikowane poprzez stosowanie efektywnych superplastyfikatorów oraz odpowiedni stosunek wodno-spoiwowy. Celem niniejszej pracy jest zwrócenie uwagi na istotny aspekt wpływu foremności ziaren kruszywa na właściwości reologiczne świeżej mieszanki betonowej oraz wytrzymałość samozagęszczalnego betonu wysokowartościowego.
6
Content available Comparative Analysis of the Bursting Strength of Knitted Sandwich Fabrics
Ciobanu A. R., Ciobanu L., Dumitras C., Sârghie B.
Fibres & Textiles in Eastern Europe
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2016
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Vol. 24, no. 2 (116)
95--101
EN
This study presents the mechanical properties of weft knitted sandwich fabrics (bursting strength) and the effect of the raw materials used. Two types of fabrics, with and without reinforcing yarns, were analyzed. To determine the influence of the raw material type, a combination of three structure variants were obtained by changing the position in the structure architecture of two types of raw material: Kevlar® and linen yarns. Each of these variants was studied at three levels of density, given by the position of the quality cam, in order to determine the influence of this parameter. Tests were organized in two stages: the first concerned the bursting behavior of single layer fabrics, and the second considered the study of more layers of sandwich fabrics with different orientation. Satisfactory results were obtained after this study regarding the possibility of replacing the high-performance yarns with natural ones.
PL
Praca przedstawia właściwości mechaniczne wątkowych dzianin warstwowych, w tym wpływ stosowanego surowca na wytrzymałość na zerwanie. Dla stwierdzenia wpływu stosowanego materiału wyprodukowano 3 warianty strukturalne zmieniając strukturę warstw wykonanych z Kevlaru i włókien lnianych. Każdy z wariantów był badany przy 3 rożnych wartościach gęstości poprzez zmianę pozycji krzywki w celu określenia wpływu na badane parametry. Testy przeprowadzono w dwóch stopniach. Pierwszy uwzględniał badanie wytrzymałości na zerwanie dzianin jednowarstwowych, drugi uwzględniał udział większej ilości warstw wielowarstwowej struktury dzianiny przy rożnej orientacji. Uzyskano zadowalające wyniki uwzględniające możliwość zastąpienia wysokowytrzymałych przędz poprzez przędze surowców naturalnych.
7
Content available remote High Performance Computing on New Accelerated Hardware Architectures
Błażewicz M., Kurowski K., Ludwiczak B., Napierała K.
Computational Methods in Science and Technology
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2010
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Vol. spec. iss. (1)
71-79
EN
This paper presents recent work that has been performed in the context of high performance computing and hybrid architectures at Poznan Supercomputing and Networking Center. Three algorithms: JPEG2000 – compression/decompression, computational fluid mechanics and motion tracking have been parallelized on various architectures and compared to reference sequential applications. The performance results, implementation issues and best practices are discussed as well.
8
Content available remote Experiments with high performance steel and composite members
Dolejs J., Tunega I., Hatlman V.
Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
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2009
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z. 52 [264]
33-42
EN
It is generally known that reduction of total construction mass leads to a decrease of secondary costs as for example transport, assembly, disassembly etc. High performance materials can be effectively used in many types of common structures. Despite a good accessibility they are still not frequently used nowadays. The basic difficulty is a missing knowledge of their behaviour in structures.
9
Content available Metodyka sprzętowej akceleracji obliczeń w środowisku obliczeniowym komputerów dużej mocy
Pietroń M., Russek P., Wiatr K.
Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
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2007
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T. 11, z. 3
149-156
PL
W środowisku komputerów dużej mocy obliczeniowej sprzętowa akceleracja obliczeń jest zagadnieniem relatywnie nowym. Oczywiście technika sprzętowej akceleracji rozumiana jako zastosowanie do określonych zadań obliczeniowych specjalnie zaprojektowanych architektur jest od dawna znana i stosowana w innych obszarach przetwarzania danych. Jednak nieprzerwany rozwój w dziedzinie technologii półprzewodnikowej oraz w obszarze narzędzi do projektowania sprzętu doprowadził do możliwości stosowania tej techniki do zadań tradycyjnie zarezerwowanych dla systemów dużej mocy obliczeniowej. Artykuł prezentuje stosowane przez autorów techniki i metody, dzięki którym możliwe jest osiągnięcie większej wydajności obliczeniowej poprzez wspomaganie realizowanych algorytmów za pomocą specjalnie projektowanych akceleratorów sprzętowych.
EN
In the area of high performance computing hardware acceleration is relatively new method. Undoubtly utilization of custom hardware is well known and widely used in several areas of digital systems. Beside that constant progress in the field of reconfigurable devices and EDA tools enhancement lead to the opportunity to use reconfigurable hardware based acceleration techniques in the area traditionally occupied by general purpose processors. This paper presents some methods used by authors to get higher computation power in scientific computation thanks to custom hardware implemented in programmable devices.
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