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1

Analysis on electromechanical coupling vibration characteristics of in-wheel motor in electric vehicles considering air gap eccentricity

Li Y., Wu H., Xu X., Cai Y., Sun X.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2019

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Vol. 67, nr 5

851--862

EN

The distortion of air gap magnetic field caused by the rotor eccentricity contributes to the electromechanical coupling vibration of the brushless DC (BLDC) permanent magnet in-wheel motor (PMIWM) in electric vehicles (EV). The comfort of the BLDC in-wheel motor drive (IWMD) EV is seriously affected. To deeply investigate the electromechanical coupling vibration of the PMIWM under air gap eccentricity, the PMIWM, tyre and road excitation are analyzed first. The influence of air gap eccentricity on air gap magnetic density is investigated. The coupling law of the air gap and the unbalanced magnetic force (UMF) is studied. The coupling characteristics of eccentricity rate, air gap magnetic density, UMF, phase current and vibration acceleration are verified on the test bench in the laboratory. The mechanism of the electro-mechanical coupling vibration of the BLDC PMIWM under air gap static eccentricity (SE), dynamic eccentricity (DE) and hybrid eccentricity (HE) is revealed. DE and HE deteriorate the vibration acceleration amplitude, which contributes the electromechanical coupling vibration of the PMIWM. The research results provide a solid foundation for the vibration and noise suppression of the PMIWM in distributed drive EV.

2

The influence of ship rolling motion on take-off aerodynamic characteristics of aircraft

He Z., Sun X., Gu X.

Polish Maritime Research

|

2018

|

S 2

23--29

EN

Ship motion is an important factor affecting on the safety of ski-jump take-off. The simplified frigate ship SFS1 was numerically simulated, and the results were compared with the experimental data, the feasibility of the calculation method was verified; Meshless method and WALE turbulence model were used to simulate the process of aircraft skijump take-off, aerodynamic characteristics under different rolling conditions during the aircraft ski-jump take-off process were presented. The results showed that: the influence of ship rolling motion on lift coefficient, drag coefficient and pitching moment was small, side force and rolling moment were greatly affected by rolling motion; the region of downwash with the maximum speed was about 10 m from the bow; the safety of ski-jump take-off was greatly affected when aircraft was close to the bow within 20 m.

3

Kinetic research of quinoline, pyridine and phenol adsorption on modified coking coal

Sun X., Xu H., Wang J., Ning K., Huang G., Yu Y., Ma L.

Physicochemical Problems of Mineral Processing

|

2018

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Vol. 54, iss. 3

965--974

EN

Adsorption is widely used in wastewater treatment. In this work, the removal of quinoline, pyridine and phenol from coking wastewater by using modified coking coal, which was treated by four different modification methods i.e. acidification sodium hydroxide (5 mol/dm3), hydrochloric acid (5 mol/dm3) and acetic acid (5 mol/dm3) and low-temperature (105 oC) oxidation, was investigated. The modified coal was characterized by the surface area analysis, SEM, total acidity and basicity and FT-IR. The results showed that the surface area from high to low follows the order: modification with acetic acid, modification with hydrochloric acid, raw coal, modification with sodium hydroxide and modification with low-temperature. Experimental data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion. The adsorption of all followed pseudo-second-order kinetics. The result showed that the removal efficiency of coal modified by hydrochloric acid and acetic acid are higher than raw coal, while modified by sodium hydroxide and low-temperature are lower than raw coal., The coal modified by hydroxide acid had the best adsorption capacity.

4

Preparation and Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Polypropylene Grafting Maleic Anhydride Two-Component Materials

Sun X., Ge Y.

Fibres & Textiles in Eastern Europe

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2018

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Vol. 26, no. 3 (129)

17--22

EN

In order to provide a theoretical basis for the preparation and spinnability of two-component materials, poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) and polypropylene grafting maleic anhydride (PP-g-MAH) blends were prepared by melt mixing with different ratios (100/0, 75/25, 50/50, 25/75, 0/100). Properties of the blends system were investigated by means of a mixed rheometer, scanning electron microscope, simultaneous thermal analyser, differential scanning calorimetry and X-ray diffraction. The results demonstrate that PHBV/PP-g-MAH blends exhibit different morphology of the sea-island with a change in the mix ratio. The initial thermal decomposition temperature of PHBV in the blending system is over 250 °C, which means the thermal stability of PHBV is markedly improved. The crystallisation of PHBV varied according to the blending process parameter. When the cooling velocity increases, the crystallisation peak becomes wide, the temperature of crystallisation decreases, and the crystallisation temperature of PHBV increases significantly. PHBV has a high sensitivity to variation in the shear rate, and PHBV/PP-g-MAH blends have the mixing characteristic of shear thinned liquid. There is no diffraction peak at 2θ = 22.8°, and this result certifies that PP-g-MAH changes the crystal form of PHBV. and that PP-g-MAH addition is beneficial to the spinnability of PHBV. Results show that the interplay between PHBV and PP-g-MAH is of great significance and universal for both plastics and fibres.

PL

Celem pracy było zapewnienia teoretycznych podstaw przygotowania i przędzenia materiałów dwuskładnikowych z mieszaniny poli (3-hydroksymaślan-co-3-hydroksywalerianian) (PHBV) i polipropylenu przy użyciu szczepów bezwodnika maleinowego (PP-g-MAH). Przygotowano mieszanki o różnych stosunkach: 100/0, 75/25, 50/50, 25/75, 0/100. Właściwości układu mieszanin badano za pomocą reometru, skaningowego mikroskopu elektronowego, analizatora termicznego, różnicowej kalorymetrii skaningowej i dyfrakcji rentgenowskiej. Wyniki wykazały, że mieszanki PHBV/PP-g-MAH wykazują różną morfologię typu „wyspa morska” wraz ze zmianą proporcji mieszania. Początkowa temperatura rozkładu termicznego PHBV w układzie mieszania wynosiła ponad 250 °C, co oznacza, że stabilność termiczna PHBV została znacznie poprawiona. Krystalizacja PHBV zmieniała się zgodnie z parametrem procesu mieszania. Gdy prędkość chłodzenia wzrastała, pik krystalizacji stawał się szeroki, temperatura krystalizacji zmniejszałą się, a temperatura krystalizacji PHBV znacząco wzrastała. PHBV ma wysoką czułość na zmienność szybkości ścinania, a mieszanki PHBV/PP-g-MAH mają charakterystykę mieszania ścinanej cieczy. Nie wykryto piku dyfrakcyjnego przy 2θ = 22,8°, co poświadcza, że PP-g-MAH zmienia postać krystaliczną PHBV i że dodatek PP-g-MAH jest korzystny dla zdolności przędzenia PHBV. Wyniki pokazują, że wzajemne oddziaływanie pomiędzy PHBV i PP-g-MAH ma ogromne znaczenie i jest uniwersalne zarówno dla tworzyw sztucznych, jak i włókien.

5

Digital control system design for bearingless permanent magnet synchronous motors

Sun X., Shi Z., Yang Z., Wang S., Su B., Chen L., Li K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

|

Vol. 66, nr 5

687--698

EN

This study investigates a digital control system which is used in bearingless permanent magnet synchronous motors (BPMSMs). Compared with traditional permanent magnet synchronous motors, a BPMSM is characterized by higher speed and no mechanic friction. Therefore, the application value of the latter to the special area is higher than that of the former. An analysis from previous work on the BPMSM had proved its feasibility, and some performances such as suspension force, inductance and so on were also investigated. Based on this analysis, this study focuses on solving control problems in practical applications by designing a control system. The control system design includes overall schematic, hardware and software designs. Main software systems, including the force/current transform module and closed loop control module for radial displacement, are analyzed. Interface circuit for radial displacement, current feedback circuit and dead zone protection circuit are designed for the hardware system. Finally, several performance experiments have been conducted to verify the effectiveness of the designed digital control system. Experiment results indicate that the rotor has unique characteristics, such as stable suspension performance, good start-of-suspension performance, and rapid anti-disturbance features.

6

Phase Transition and Plasticity Enhancement of Ti-Cu-Based Bulk Metallic Glasses

Wang L., Wang X., Zhang G., Sun X.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 1

387--391

EN

In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, Trg. The first exothermic event just occurs when annealing the BMG samples in the supercooled liquid region, leading to the Avrami exponent deviating from conventional modes affected by the residual amorphous phase. For Ti43Cu43Ni7Zr7 BMG, the plasticity can be improved by pre-annealing at a sub-Tg temperature of 623K (≈50K below Tg) for 0.5 hour, however, deteriorated by 1 hour annealing, which could be related to the change in stability of this BMG against crystallization with different pre-annealing times.

7

Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets

Sun X., Su B., Chen L., Yang Z., Li K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 6

833--843

EN

In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.

8

Comparative study of fault-tolerant performance of a segmented rotor SRM and a conventional SRM

Sun X., Xue Z., Han S., Chen L., Xu X., Yang Z.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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Vol. 65, nr 3

375--381

EN

Due to the separation of magnetic field, electrical isolation and thermal isolation, motor drives possess a high fault-tolerance characteristic. In this paper, comparative study of mutual inductance between the proposed segmented rotor switched reluctance motor (SSRM) and the conventional switched reluctance motor (SRM) is carried out first, illustrating that the proposed SSRM has less mutual inductance between phases than the conventional SRM. In addition, if winding faults or power converter faults lead to phase failure, a comparative analysis on fault-tolerant performance under phase failure condition between the proposed SSRM and the conventional SRM is simulated in detail using the finite element method (FEM). Simulation results reveal that dynamic performance of the proposed SSRM, including output torque and phase current, is better than that of the conventional SRM. That is, the capacity of operating with the fault under phase failure condition in the proposed SSRM is superior to that in the conventional SRM.

9

A polarization selective beam splitter based on a subwavelength multisubpart profile grating structure

Xiao Y., Huang L., Wu H., Sun X., Xiao W., Duan J.

Optica Applicata

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2016

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Vol. 46, nr 4

665--672

EN

In this study, a polarization selective beam splitter constructed by only a single layer subwavelength multisubpart profile grating is presented. Rigorous coupled-wave analysis is adopted to investigate the properties of the structure. It is shown that for a transverse electric polarized wave, the device demonstrates very high reflectivity (>97%) from 1.46 to 1.58 μm; and for a transverse magnetic polarized wave, at the wavelength of 1.55 μm, it exhibits about 50/50 beam ratio under normal incidence. To evaluate the response of the polarizing beam splitters under variation in structure parameters, we also investigated the fabrication tolerances of the device.

10

Improved Gabor Deconvolution and Its Extended Applications

Sun X., Sun S. Z.

Acta Geophysica

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2016

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Vol. 64, no. 1

61--75

EN

In log time-frequency spectra, the nonstationary convolution model is a linear equation and thus we improved the Gabor deconvolution by employing a log hyperbolic smoothing scheme which can be implemented as an iteration process. Numerical tests and practical applications demonstrate that improved Gabor deconvolution can further broaden frequency bandwidth with less computational expenses than the ordinary method. Moreover, we attempt to enlarge this method’s application value by addressing nonstationary and evaluating Q values. In fact, energy relationship of each hyperbolic bin (i.e., attenuation curve) can be taken as a quantitative indicator in balancing nonstationarity and conditioning seismic traces to the assumption of unchanging wavelet, which resultantly reveals more useful information for constrained reflectivity inversion. Meanwhile, a statistical method on Q-value estimation is also proposed by utilizing this linear model’s gradient. In practice, not only estimations well agree with geologic settings, but also applications on Q-compensation migration are favorable in characterizing deep geologic structures, such as the pinch-out boundary and water channel.

11

Nano-silica reinforced hybrid light-diffusing films with enhanced mechanical and thermal properties

Sun X, Li N., Hang J, Jin L., Shi L, Cheng Z., Shang D

Optica Applicata

|

2015

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Vol. 45, nr 3

393--404

EN

Ultraviolet-curable hybrid light-diffusing films with good optical, mechanical and thermal properties were prepared by involving vinyl-silane-modified nano-silica into light-diffusing films. The light-diffusing films were two-phase materials consisting of UV-curable matrix and light-diffusing agent. The effect of three different light-diffusing agents, viz. inorganic layered particle (CaCO3), spherical acrylic resin (MR-7HG) and organosilicone resin (KMP-590) and their contents, on the optical properties of light-diffusing films was studied. The results showed the light-diffusing film exhibited good optical properties (the transmittance was 90.7% and the haze was 95.5%) when KMP-590 was a light-diffusing agent and its content was 25%. It was because that KMP-590 showed good transparency, good dispersion in the UV-curable matrix and the greater difference in refractive index with UV-curable matrix and polycarbonate substrate. Furthermore, the effect of nano-silica on the optical, mechanical and thermal properties of the hybrid light-diffusing films was investigated. Compared to that of the light-diffusing films without nano-silica, the haze of the hybrid light-diffusing films containing nano-silica was lightly enhanced to above 98%, while their transmittance basically remained unchanged at a high value (above 89%). Additionally, scratch and abrasion resistance of the hybrid films were obviously improved by nano-silica especially with the particle size of 10–15 nm. Furthermore, the mechanical property and thermal stability of the hybrid films were improved as the content of nano-silica with the particle size of 10–15 nm increased. The enhanced mechanical property and thermal stability of the films could be attributed to the dense structure induced by the increase in network density with the addition of vinyl-silane-modified nano-silica.

12

Network resource reallocation strategy based on an improved capacity-load model

Zhou J., Huang N., Sun X., Xing L., Zhang S.

Eksploatacja i Niezawodność

|

2015

|

Vol. 17, no. 4

487--495

EN

Network resource reallocation is a common way to help restore performance of network systems subject to cascading failures. Majority of current network resource allocation strategies either give little regard to or make impractical assumptions about the relationship between capacity and load of network nodes, despite this relationship is closely related to the propagation of network failures. In this work we present and verify an improved nonlinear network capacity-load model based on the actual relation between network capacity and load. According to the verified model and realistic dynamic characteristics of network loads, we propose a new network resource reallocation strategy for networks under attacks from the perspective of maintenance. The strategy aims to effectively reallocate new capacity to network nodes after cascading failures occur. Both theoretical analysis and empirical studies are performed on three typical types of complex networks. Results show that the proposed network resource reallocation strategy is more efficient in mitigating devastating impact of cascading failures on network performance, in comparison to other three existing network resource reallocation strategies.

PL

Realokacja zasobów sieci jest powszechnym sposobem, stosowanym w celu przywrócenia działania systemów sieciowych objętych awariami kaskadowymi. Większość współczesnych strategii alokacji zasobów sieciowych kładzie mały nacisk lub czyni niepraktyczne założenia dotyczące zależności między przepustowością i obciążeniem węzłów sieci, choć zależność ta jest ściśle związana z rozchodzeniem się awarii sieci. W niniejszej pracy przedstawiono i zweryfikowano udoskonalony nieliniowy model przepustowości-obciążenia sieci na podstawie rzeczywistej relacji między przepustowością sieci i jej obciążeniem. Na podstawie zweryfikowanych modelu i realistycznych cech dynamicznych obciążeń sieciowych, proponujemy nową strategię realokacji zasobów dla sieci poddawanych atakom z perspektywy utrzymania ruchu. Celem strategii jest skuteczna realokacja nowej przepustowości węzłom sieci po wystąpieniu kaskadowych awarii. Przeprowadzono zarówno teoretyczne analizy, jak i badania empiryczne na trzech typowych rodzajach sieci złożonych. Wyniki pokazują, że proponowana strategia realokacji zasobów sieci jest bardziej skuteczna w zwalczaniu niszczącego wpływu kaskadowych awarii na przepustowość sieci w porównaniu do pozostałych trzech wykorzystywanych strategii realokacji zasobów sieciowych.

13

Tissue Classification Using Efficient Local Fisher Discriminant Analysis

Wang Z., Sun X., Sun L., Qian X.

Przegląd Elektrotechniczny

|

2013

|

R. 89, nr 3b

113--115

EN

A novel scatter-difference-based local Fisher discriminant analysis(SDLFDA) algorithm for tissue classification is proposed in this paper. SDLFDA explicitly considers the local manifold structure and interclass discrimination in gene expression data space. By using SDLFDA, each gene expression data can be projected into a lower-dimensional discriminative feature space. In addition, SDFLDA reduces the computational cost through QR decomposition. Experimental results demonstrate the effectiveness and efficiency of the proposed SDLFDA algorithm.

PL

W artykule przedstawiono algorytm analizy lokalnym wyróżnikiem Fisher’a opartym na różnicach rozproszenia (ang. SDLFDA), służący do klasyfikacji tkanek. Proponowana metoda pozwala na zmniejszenie wymiarowości przestrzeni wyróżnika, określającego dane GXD, a także redukcję kosztów obliczeniowych dzięki dekompozycji QR. Wyniki badań eksperymentalnych potwierdzają skuteczność i sprawność algorytmu.

14

The Theoretical Analysis Model and Statistical Test Research on Enterprises Development - A Study of Data from 195 Large and Medium Manufacturing Enterprises in China

Yin H., Guo T., Li B., Zhu J., Sun X.

Przegląd Elektrotechniczny

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2013

|

R. 89, nr 3b

198--206

EN

On the basis of dynamic capabilities theory, this paper has put forward the theoretical analysis model and examined questionnaire data from 195 large and medium manufacturing enterprises in 2011 through statistical test methods including intermediary role term and SEM model. The results are as follows: first, in the test for basic constructs, the correlation of independent and dependent variables Sig. <0.001 and Pearson coefficient>0.500, all multiple correlation coefficient > 0.800, all determination coefficient R2 >0.650, Durbin-Watson coefficient approximated to 2.000, all check coefficient has presented distinct character, the whole regressive model explained variation achieved significant standard and all hypothesis have passed the statistical test. Secondly, during the tests for hypothesis with intermediary role term, the regressive coefficient intermediary variable was up to 0.723 and markedly different from 0(Sig. <0.001), the regressive coefficient of organization modularization, intellectual capital and knowledge resource were decreased respectively, determination coefficient R2 increased to 0.889 with significant higher explanation power. It shows that the regressive model with intermediary variable has influenced much on comprehensive regression effect and the hypothesis of intermediary role term have passed the statistical tests.

PL

W artykule przedstawiono analizę teoretyczną danych ze 195 dużych i średnich przedsiębiorstw produkcyjnych z 2011 roku. Wykorzystano do tego celu testy statystyczne, w tym model SEM. Zamieszczone wyniki pokazują, że zastosowany model regresyjny ze zmiennymi pośrednimi ma duży wpływ na ogólny efekt regresji. Analiza hipotezy o roli pośrednika, na podstawie dokonanych testów, okazała się prawdziwa.

15

ESR dose response of the Al center measured in quartz samples from the Yellow River (China): Implications for the dating of Upper Pleistocene sediment

Voinchet P., Yin G., Falguères Ch., Liu Ch., Han F., Sun X., Bahain J. J.

Geochronometria

|

2013

|

Vol. 40, no. 4

341--347

EN

The ESR dating method requires to describe the evolution of the ESR signal intensities vs. increasing gamma doses, then to extrapolate the equivalent dose of radiation received by the sample since its deposition using mathematical fitting. The function classically used to describe the growth curves of ESR aluminium signal in quartz was recently discussed and challenged for Lower Pleisto-cene sediments. In the present work, some alluvial sediments sampled in Upper Pleistocene fluvial terraces of the Yellow River system (China) permit us to test the application of another extrapolation function (linear + exponential) recently proposed for Lower Pleistocene sediments. The equivalent doses obtained here for the recent deposits of the Yellow River system and the corresponding ages are promising and indicate the potential of ESR to date quartz deposits from Upper Pleistocene times.

16

Voice Conversion Using A Two-Factor Gaussian Process Latent Variable Model

Sun X., Zhang X., Cao T., Yang J., Sun J.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 12a

318-324

EN

This paper presents a novel strategy for voice conversion by solving style and content separation task using a two-factor Gaussian Process Latent Variable Model (GP-LVM). A generative model for speech is developed by interaction of style and content, which represent the voice individual characteristics and semantic information respectively. The interaction is captured by a GP-LVM with two latent variables, as well as a GP mapping to observation. Then, for a given collection of labelled observations, the separation task is accomplished by fitting the model with Maximum Likelihood method. Finally, voice conversion is implemented by style alternation, and the desired speech is reconstructed with the decomposed target speaker style and the source speech content using the learned model as a prior. Both objective and subjective test results show the advantage of the proposed method compared to the traditional GMM-based mapping system with limited size of training data. Furthermore, experimental results indicate that the GP-LVM with nonlinear kernel functions behaves better than that with linear ones for voice conversion due to its ability of better capturing the interaction between style and content, and rich varieties of the two factors in a training set also help to improve the conversion performance.

PL

W artykule opisano nową strategię konwersji głosu, poprzez rozdzielenie rodzaju i treści, przy wykorzystaniu dwu-wskaźnikowej metody GPLVM (ang. Gaussian Process Latent Variable Model). Wykonane badania wskazują na lepsze działanie proponowanego algorytmu w porównaniu z tradycyjnie stosowanym systemem mapowania typu GMM przy ograniczonej ilości danych do testowania. Wykazano, że GPLVM ma lepsze właściwości w konwersji głosu z nieliniową niż liniową funkcją jądra.

17

Efficient Kernel Discriminative Geometry Preserving Projection for Document Classification

Wang Z., Sun X., Qian X.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 5b

56-59

EN

A new dimensionality reduction algorithm called kernel discriminative geometry preserving projection (KDGPP) is proposed to cope with document classification. By considering both intraclass geometry and interclass discrimination, KDGPP can not only nonlinearly project documents into lower-dimensional feature space via manifold adaptive kernel function but also reduce the computational complexity with Nyström method. Experimental results demonstrate that KDGPP outperforms other related algorithms in terms of effectiveness and efficiency.

PL

Zaproponowano nowy algorytm do klasyfikacji dokumentów nazwany KDGPP – kernel discriminative geometry preserving projection. Algorytm redukuje złożoność obliczeń numerycznych.

18

An Application of Canonical Decomposition to TDOA Estimation for 3D Wireless Sensor Network Node Localization

Jiang H., Liu C., Sun X.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 9b

92-95

EN

In this paper, a time difference of arrival (TDOA) estimation algorithm is proposed by extending canonical correlation decomposition (CCD) to measure multipath delays for determining node positions in Ultra-wideband wireless sensor networks (WSNs). Multilateral localization based on 3D Chan algorithm is employed to solve the non-linear problems for performance improvement. The method can perform well in the environment with unknown noise. The effectiveness is validated by simulations and the effects of noise and the number of anchor nodes are analyzed.

PL

Przedstawiono algorytm TDOA (time difference of arrival) do określania wielościeżkowych opóźnień w szerokopasmowej bezprzewodowej sieci czujników. Metoda jest przydatna w środowisku o nieznanych szumach.

19

A Novel Structure Design and Training Algorithm for Quantum Neural Network

Sun J., Zhang X., Cao T., Yang J., Sun X., Liao Q.

Przegląd Elektrotechniczny

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2012

|

R. 88, nr 2

315-320

EN

In the structure of original Quantum Neural Network (QNN), only multi-sigmoid transfer function is adopted. Besides that, due to the conflict of the two objective functions in original training algorithm, the training process converges slowly and presents constant variation. In this paper, the QNN with multi-tan-sigmoid transfer function and a novel training algorithm which combines the two objective functions are proposed. Experimental results demonstrate the effectiveness of the structure improvement and the new training algorithm.

PL

W oryginalnym algorytmie kwantowej sieci neuronowej QNN tylko multisigmoidalna funkcja przejścia jest wykorzystywana. W pracy zaprezentowano sieć z multi-tan-sigmoidalną funkcją przejścia z nowym algorytmem uczenia.

20

Design and fabrication of an organic/inorganic hybrid co-planar waveguide electro-optic modulator

Gao W., Sun J., Sun X., Yan Y., Gao L., Zhang D.

Optica Applicata

|

2009

|

Vol. 39, nr 3

467-472

EN

We have successfully designed and demonstrated a co-planar waveguide (CPW) Mach-Zehnder (MZ) electro-optic (EO) modulator using a strip-loaded waveguide structure. The hybrid material, easily synthesized by sol-gel process, with a large EO coefficient of r33 = 50 pm/V and a long- -term stability at 80 °C for 200 hours is selected as the active layer. A simple and easily fabricated strip-loaded waveguide structure is designed for utilizing the EO material and reducing the coupling loss with optical fiber. The optimized design principles of the efficient transmission for such a modulator are discussed. The measured half-wave voltage V? of 8.5 V for the MZ modulator is gained at 1550 nm and shows a good agreement with the simulating result.