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1
A Theoretical Analysis of Two-Stage Recommendation for Cold-Start Collaborative Filtering
e-Kitap

e-Kitap
Open Access
Kaynak :
Internet Archive Books
Dergi:
arXiv.org
Yayıncı:
arXiv.org
Yazar(lar) :
Jun Wang , Xiaoxue Zhao
Yıl :
2016
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
In this paper, we present a theoretical framework for tackling the cold-start collaborative filtering problem, where unknown targets (items or users) keep coming to the system, and there is a limited number of resources (users or items) that can be allocated and related to them. The solution requires a trade-off between exploitation and exploration as with the limited recommendation opportunities, we need to, on one hand, allocate the most relevant resources right away, but, on the other hand, it is also necessary to allocate resources that are useful for learning the target's properties in order to recommend more relevant ones in the future. In this paper, we study a simple two-stage recommendation combining a sequential and a batch solution together. We first model the problem with the partially observable Markov decision process (POMDP) and provide an exact solution. Then, through an in-depth analysis over the POMDP value iteration solution, we identify that an exact solution can be abstracted as selecting resources that are not only highly relevant to the target according to the initial-stage information, but also highly correlated, either positively or negatively, with other potential resources for the next stage. With this finding, we propose an approximate solution to ease the intractability of the exact solution. Our initial results on synthetic data and the Movie Lens 100K dataset confirm the performance gains of our theoretical development and analysis.
2
Land and labor allocation under communal tenure: Theory and evidence from China
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Development Economics
Yayıncı:
Elsevier
Yazar(lar) :
Xiaoxue Zhao
Yıl :
2020
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper studies rural communities' land and labor choices under communal tenure. I develop a theoretical framework to explain why rural communities often adopt practices of labor-contingent land access and frequent land reallocations under communal tenure, and argue that, although these practices reduce cross-household income inequality and improve agricultural production efficiency under imperfect markets, they can nonetheless inefficiently trap labor in agriculture. I rely on a legal reform in 2003 that stopped land reallocations in all Chinese villages and exploit the variation in villages’ reallocation practices before the reform to test the model predictions. The results suggest that the elimination of land reallocations increased off-farm labor and household per capita net income by 7% and 6.5% respectively. However, this came at the cost of a 6% reduction in total agricultural output and a significant jump in intra-village income inequality.
DOI : 10.1016/j.jdeveco.2020.102526
Anahtar Kelimeler : Institutions, Communal tenure, Land reallocations, Agriculture, D01, D13, D61, O12, P26, Q15
ISSN: 0304-3878
Cilt: 147
Sayfa: 102526
Sınıflandırma :
Ekonomi %40
3
A Biomechanical Analysis of Lower Limb Movement on the Backcourt Forehand Clear Stroke among Badminton Players of Different Levels
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Applied Bionics and Biomechanics
Yazar(lar) :
Xiaoxue Zhao , Shudong Li
Yıl :
2019
Xiaoxue Zhao
Piri Tam Metin Bulucu
Kaydet Alıntıla
Most of the previous studies have been focused on the upper limb biomechanical characteristic in the clear stroke among different level badminton players, but research on the lower limb is limited. The aim of this study is to explore the lower limb kinematics and foot pressure in the backcourt forehand clear stroke among badminton players to give theoretical reference in teaching and answer the questions occurring in the process of learning the actions. Ten professional badminton players (PP) and ten amateur players (AP) were recruited in this study. Plantar pressure analyses indicated that both the PP and the AP were in contact with the ground over the forefoot without the midfoot and heel. The work suggests that when designing professional badminton sports shoes, the designers should focus on strengthening footwear resistance in the metatarsal and forefoot area, especially the first metatarsal area, to meet the requirement of the movement demand and take the badminton movement characteristics in different regions of the design. The peak ankle dorsiflexion, eversion, and internal rotation angle levels of the AP are lower than those of the PP. It is important for the AP group to enhance their ankle strength to prevent injury and improve performance.
DOI : 10.1155/2019/7048345
Cilt: 2019
Sınıflandırma :
4
Do Kinship Networks Strengthen Private Property? Evidence from Rural China
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Journal of Empirical Legal Studies
Yazar(lar) :
Taisu Zhang , Xiaoxue Zhao
Konu :
Law, Education
Yıl :
2014
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This article finds that the existence of strong kinship networks tends to limit state interference with private property use in rural China by protecting villagers against unwanted government land takings. It then distinguishes kinship networks from other kinds of social networks by showing that their deterrence effect against coercive takings is far more significant and resilient under conditions of prevalent rural‐urban migration than deterrence by neighborhood cooperatives and religious groups. Finally, the article attempts to identify and differentiate between various possible mechanisms behind these effects: it argues that kinship networks protect private property usage mainly through encouraging social reciprocity between kinsmen, which facilitates collective action against coercive takings. Kinship networks are more effective than neighborhood cooperatives or religious groups at sustaining reciprocity over long distances and, therefore, are less affected by rural‐urban migration. Altruism between kinsmen, however, does not emerge from the data as a major factor.
DOI : 10.1111/jels.12048
ISSN: 1740-1453
Sayı: 3
Cilt: 11
Sayfa: 505-540
5
Technology and Human Development
Dergi Makalesi

Dergi Makalesi
Kaynak :
Taylor and Francis
Dergi:
Journal of Human Development and Capabilities
Yayıncı:
Informa UK Limited
Yazar(lar) :
Gustav Ranis , Xiaoxue Zhao
Konu :
Anthropology
Yıl :
2013
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper has two main objectives. The first is to focus on the role of technology, in combination with human development, in generating the growth needed for further increases in human development, which is seen as the bottom-line output. The second objective is to explore how technology measured by total factor productivity can itself be better explained by way of examining the role of openness, foreign direct investment and various types of patents. The contrast between Latin America and Asia with respect to these variables is established.
DOI : 10.1080/19452829.2013.805318
Anahtar Kelimeler : Human development, Capability approach, Economic development, Well-being, Measurement
ISSN: 1945-2829
Sayı: 4
Cilt: 14
Sayfa: 467-482
6
Single leg landing movement differences between male and female badminton players after overhead stroke in the backhand-side court
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Human Movement Science
Yayıncı:
Elsevier
Yazar(lar) :
Xiaoxue Zhao , Yaodong Gu
Yıl :
2019
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Females showed higher anterior cruciate ligament (ACL) injuries rate on the opposite side of dominant hand compared with males during single leg landing in the backhand-side court after overhead stroke. The purpose of this study was to conduct biomechanics testing including kinematics and kinetics to provide some insights on the ACL injuries risks during single leg landing in the backhand-side court after overhead stroke between females and males. Twenty collegiate badminton players (10 females, 10 males) voluntarily participated in this study. Sagittal plane kinematic and kinetic data of the lower limb, and their ground reaction forces during the single leg landing in the backhand-side court after overhead stroke were collected. Results shown that, at the peak posterior ground reaction force (GRF) moment, the ankle dorsiflexion, knee and hip flexion angles of the female were lower than that of male. Meantime, the knee extension moment of the female was lower than that of males but the hip extension moment of the female was larger compared to males at the peak posterior GRF moment. The peak vertical and posterior GRF of female badminton players were larger than that of males. Decreased hip, knee, and ankle flexion angles at the peak posterior GRF moment and greater peak vertical and posterior GRF may expose female badminton players to the higher risk ACL injuries compared to males during single leg landing after overhead stroke in the backcourt-side. Preventative training programs designed to prevent the ACL injuries rate of female badminton players should take these factors into consideration.
DOI : 10.1016/j.humov.2019.04.007
Anahtar Kelimeler : Anterior cruciate ligament injury, Gender, Single leg landing
ISSN: 0167-9457
Cilt: 66
Sayfa: 142-148
Sınıflandırma :
7
Solving multi-class problems by data-driven topology-preserving output codes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Neurocomputing
Yayıncı:
Elsevier
Yazar(lar) :
Junying Zhang , Xiaoxue Zhao , Lan Du
Yıl :
2013
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Aiming at decomposing a complex multi-class problem into fewer and simpler sub-problems to gain an overall classifier of low complexity, we propose a universal data-driven topology-preserving output code (TPOC) scheme, and a computationally efficient supervised circular learning algorithm (CLA) for the learning of the required TPOC map in the scheme. The scheme leads to a compact code and low complexity, and is an extension of binary, ternary and ECOC code. Experiments on Iris data, NCI data, octaphase-shift-keying data and handwritten digits reveal that the scheme substantially outperforms DECOC, one-against-all, natural coding and ECOC in using a less complex classifier with no loss or even enhanced generalization performance: the total number of support vectors is reduced greatly in SVM study and that of synaptic weights is greatly reduced (e.g., by 86% with training time reduced by 98% in MLP study in handwritten digit recognition problem); the total number of synaptic weights is further reduced by about one-fourth with less than one-hundredth loss of generalization performance when classifier complexities are assigned adaptive to the coding process. Finally, it is successfully applied to automatic target recognition based on a real measured radar data.
DOI : 10.1016/j.neucom.2013.05.002
Anahtar Kelimeler : Multi-class problem, Complexity, k-ary classifiers, Topology-order preservation, Error correcting output code
ISSN: 0925-2312
Cilt: 121
Sayfa: 556-568
Sınıflandırma :
8
A New Amplifier Model for Resonance Enhancement of Optically Injection-Locked Lasers
Dergi Makalesi

Dergi Makalesi
Kaynak :
IEEE Xplore
Dergi:
IEEE Photonics Technology Letters
Yazar(lar) :
Xiaoxue Zhao , Connie J. Chang-Hasnain
Konu :
Engineered Materials, Dielectrics and Plasmas, Photonics and Electrooptics
Yıl :
2008
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A new Fabry-Perot amplifier model is established based on parameters extracted from the injection-locking rate equations to explain the resonance frequency enhancement and the small-signal frequency response behavior of injection-locked vertical-cavity surface-emitting lasers. Simulations using this amplifier model in conjunction with injection-locking rate equations show excellent agreement with the experimental results.
DOI : 10.1109/lpt.2008.916911
Anahtar Kelimeler : Semiconductor optical amplifiers, Optical amplifiers, Resonance, Stimulated emission, Laser modes, Vertical cavity surface emitting lasers, Surface emitting lasers, Equations, Fabry-Perot, Resonant frequency, laser mode locking, laser theory, nonlinear optics, surface emitting lasers, Fabry-Perot amplifier model, injection-locked vertical-cavity surface-emitting lasers, injection-locking rate equations, resonance frequency, small-signal frequency response, Optical injection locking (OIL), optical amplifier, vertical-cavity surface-emitting lasers (VCSELs)
ISSN: 1041-1135
Sayı: 6
Cilt: 20
Sayfa: 395-397
9
A Minimum Resource Neural Network Framework for Solving Multiconstraint Shortest Path Problems
Dergi Makalesi

Dergi Makalesi
Kaynak :
IEEE Xplore
Dergi:
IEEE Transactions on Neural Networks and Learning Systems
Yazar(lar) :
Junying Zhang , Xiaoxue Zhao , Xiaotao He
Konu :
Computing and Processing, Communication, Networking and Broadcast Technologies, Components, Circuits, Devices and Systems, General Topics for Engineers
Yıl :
2014
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Characterized by using minimum hard (structural) and soft (computational) resources, a novel parameter-free minimal resource neural network (MRNN) framework is proposed for solving a wide range of single-source shortest path (SP) problems for various graph types. The problems are the k-shortest time path problems with any combination of three constraints: time, hop, and label constraints, and the graphs can be directed, undirected, or bidirected with symmetric and/or asymmetric traversal time, which can be real and time dependent. Isomorphic to the graph where the SP is to be sought, the network is activated by generating autowave at source neuron and the autowave travels automatically along the paths with the speed of a hop in an iteration. Properties of the network are studied, algorithms are presented, and computation complexity is analyzed. The framework guarantees globally optimal solutions of a series of problems during the iteration process of the network, which provides insight into why even the SP is still too long to be satisfied. The network facilitates very large scale integrated circuit implementation and adapt to very large scale problems due to its massively parallel processing and minimum resource utilization. When implemented in a sequentially processing computer, experiments on synthetic graphs, road maps of cities of the USA, and vehicle routing with time windows indicate that the MRNN is especially efficient for large scale sparse graphs and even dense graphs with some constraints, e.g., the CPU time taken and the iteration number used for the road maps of cities of the USA is even less than ~2% and 0.5% that of the Dijkstra's algorithm.
DOI : 10.1109/tnnls.2013.2293775
Anahtar Kelimeler : Neurons, Biological neural networks, Convergence, Routing, Time factors, Parallel processing, Learning systems, computational complexity, graph theory, iterative methods, neural nets, resource allocation, search problems, vehicle routing, vehicle routing with time windows, resource utilization, transportation networks, iteration process, computation complexity, k-shortest time path problems, graph types, SP, single-source shortest path problems, multiconstraint shortest path problem solving, MRNN framework, minimum resource neural network framework, Autowave, minimum resource neural network (MRNN), multiconstraint, shortest path (SP) problems., Algorithms, Computer Simulation, Game Theory, Models, Statistical, Neural Networks (Computer), Pattern Recognition, Automated, Autowave, minimum resource neural network (MRNN), multiconstraint, shortest path (SP) problems
ISSN: 2162-237X 2162-2388
Sayı: 8
Cilt: 25
Sayfa: 1566-1582
10
Mechanical-electromagnetic coupling elastic vibration instability of symmetrical three-phase external rotor induction motor
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Nonlinear Dynamics
Yazar(lar) :
Shiyu Wang , Xiaoxue Zhao , Ying Xia , Jie Xiu
Konu :
Electrical and Electronic Engineering, Applied Mathematics, Mechanical Engineering, Ocean Engineering, Aerospace Engineering, Control and Systems Engineering
Yıl :
2019
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The work investigates the elastic vibration instability induced by rotating electromagnetic load in symmetrical three-phase external rotor induction motor with compliant rotor and stator. The investigation is based on a mechanical-electromagnetic coupling dual-ring model undergoing flexural and extensional deformations. The model is established in a field-synchronous coordinates such that the time variance of electromagnetic load can be eliminated. The dependence of electromagnetic load on pole pair count and wavenumber is classified into typical cases. The eigenvalues are calculated by simple vibration theory such that unstable behaviors can be accurately estimated. The estimation is independent of weak-parametric source assumption. For verification purpose, a time-variant model is constructed in the inertial frame, based on which typical cases of the time-variant electromagnetic load are classified in terms of the pole pair count and wavenumber. Numerical calculations are performed by using Floquét theory, and transition curves between stable and unstable regions are identified. The results in field-synchronous and inertial frames are well compared with each other.
DOI : 10.1007/s11071-019-04901-1
Anahtar Kelimeler : Three-phase induction motor, External rotor, Eigenvalue, Instability
ISSN: 0924-090X 1573-269X
Sayı: 1
Cilt: 97
Sayfa: 1-20
11
Upstream vertical cavity surface-emitting lasers for fault monitoring and localization in WDM passive optical networks
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Optics Communications
Yayıncı:
Elsevier
Yazar(lar) :
Elaine Wong , Xiaoxue Zhao , Connie J. Chang-Hasnain
Yıl :
2008
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
As wavelength division multiplexed passive optical networks (WDM-PONs) are expected to be first deployed to transport high capacity services to business customers, real-time knowledge of fiber/device faults and the location of such faults will be a necessity to guarantee reliability. Nonetheless, the added benefit of implementing fault monitoring capability should only incur minimal cost associated with upgrades to the network. In this work, we propose and experimentally demonstrate a fault monitoring and localization scheme based on a highly-sensitive and potentially low-cost monitor in conjunction with vertical cavity surface-emitting lasers (VCSELs). The VCSELs are used as upstream transmitters in the WDM-PON. The proposed scheme benefits from the high reflectivity of the top distributed Bragg reflector (DBR) mirror of optical injection-locked (OIL) VCSELs to reflect monitoring channels back to the central office for monitoring. Characterization of the fault monitor demonstrates high sensitivity, low bandwidth requirements, and potentially low output power. The added advantage of the proposed fault monitoring scheme incurs only a 0.5 dB penalty on the upstream transmissions on the existing infrastructure.
DOI : 10.1016/j.optcom.2007.12.025
ISSN: 0030-4018
Sayı: 8
Cilt: 281
Sayfa: 2218-2226
Sınıflandırma :
12
Economic transition and private-sector labor: Evidence from urban China
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Comparative Economics
Yayıncı:
Elsevier
Yazar(lar) :
Lakshmi Iyer , Xin Meng , Nancy Qian , Xiaoxue Zhao
Yıl :
2019
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper studies the transition of labor from the state sector to the infant private sector in urban China. We examine the impact of the first wave of housing reforms, which untied access to housing in urban areas from working for the state sector. We find that the reform significantly increased private housing ownership and private-sector employment, and reduced private-sector wages. The housing reform had no effect on unemployment or self-employment.
DOI : 10.1016/j.jce.2019.04.003
Anahtar Kelimeler : Economic transition, Structural change, Labor mobility, Housing reform, China, O12, P2, P26, J23
ISSN: 0147-5967
Sayı: 3
Cilt: 47
Sayfa: 579-600
Sınıflandırma :
13
Political connection, corporate philanthropy and efficiency: Evidence from China’s anti-corruption campaign
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Comparative Economics
Yayıncı:
Elsevier
Yazar(lar) :
Zhuoqun Hao , Yu Liu , Jinfan Zhang , Xiaoxue Zhao
Yıl :
2020
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
We find that the 2013 Chinese anti-corruption campaign remarkably reduced charitable donations from listed companies with strong political connections, and lessened government subsidies to these companies, implying a reciprocal relationship between companies and the government prior to the campaign. The campaign also improved the productivity of companies with strong connections. The results are consistent with a model in which favor exchanges between firms and the government divert resources away from production in a corrupt environment. These findings highlight a self-serving, and sometimes corrupt, motive of corporate donation, and imply that the campaign is effective in curbing corrupt collusion between companies and government officials. Moreover, they give empirical support to the negative efficiency implications of corruption.
DOI : 10.1016/j.jce.2020.03.002
Anahtar Kelimeler : Corporate donation, Government subsidy, Political connection, Efficiency, Chinau2019s anti-corruption campaign, D22, D73
ISSN: 0147-5967
Sayı: 3
Cilt: 48
Sayfa: 688-708
Sınıflandırma :
14
Robust data clustering by learning multi-metric Lq-norm distances
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Expert Systems with Applications
Yayıncı:
Elsevier
Yazar(lar) :
Junying Zhang , Liuqing Peng , Xiaoxue Zhao , Ercan E. Kuruoglu
Yıl :
2012
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Unsupervised clustering for datasets with severe outliers inside is a difficult task. In this approach, we propose a cluster-dependent multi-metric clustering approach which is robust to severe outliers. A dataset is modeled as clusters each contaminated by noises of cluster-dependent unknown noise level in formulating outliers of the cluster. With such a model, a multi-metric Lp-norm transformation is proposed and learnt which maps each cluster to the most Gaussian distribution by minimizing some non-Gaussianity measure. The approach is composed of two consecutive phases: multi-metric location estimation (MMLE) and multi-metric iterative chi-square cutoff (ICSC). Algorithms for MMLE and ICSC are proposed. It is proved that the MMLE algorithm searches for the solution of a multi-objective optimization problem and in fact learns a cluster-dependent multi-metric Lq-norm distance and/or a cluster-dependent multi-kernel defined in data space for each cluster. Experiments on heavy-tailed alpha-stable mixture datasets, Gaussian mixture datasets with radial and diffuse outliers added respectively, and the real Wisconsin breast cancer dataset and lung cancer dataset show that the proposed method is superior to many existent robust clustering and outlier detection methods in both clustering and outlier detection performances.
DOI : 10.1016/j.eswa.2011.07.023
Anahtar Kelimeler : Robust clustering, Multi-metric Lq-norm distance, Distance learning, Outlier detection
ISSN: 0957-4174
Sayı: 1
Cilt: 39
Sayfa: 335-349
Sınıflandırma :
15
Export to elude
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of International Economics
Yayıncı:
Elsevier
Yazar(lar) :
Haichao Fan , Yu Liu , Larry D. Qiu , Xiaoxue Zhao
Yıl :
2020
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
How does domestic value-added tax (VAT) reform affect firms' export? We address this question via a model in which firms choose their sales for the domestic and foreign markets optimally. The model predicts that strengthening domestic tax enforcement has a negative effect on domestic sales but a positive effect on exports when firms face a convex production cost function. We test the model predictions using detailed firm- and product-level data from Chinese industrial surveys and customs records. Our empirical analyses rely on China's Golden Tax Project, which is an information technology introduced in 2001–2002 that dramatically reduces the cost of VAT enforcement. We find that, after the adoption of the technology by the government, firms located far from local tax offices face a larger increase in their effective VAT rates than those located nearby (the enforcement effect), and the former increase their export more than the latter (the elusion effect). We also find that the elusion effect is stronger for firms subject to higher export rebates or more severe financial constraints.
DOI : 10.1016/j.jinteco.2020.103366
Anahtar Kelimeler : Enforcement technology, VAT export rebate, Exports, Convex costs, Financial constraints, H26, H32, F13, F14
ISSN: 0022-1996
Sayfa: 103366
Sınıflandırma :
16
Design of metal-organic frameworks (MOFs)-based photocatalyst for solar fuel production and photo-degradation of pollutants
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Chinese Journal of Catalysis
Yayıncı:
Elsevier BV
Yazar(lar) :
Xiaoxue Zhao , Jinze Li , Xin Li , Pengwei Huo , Weidong Shi
Yıl :
2021
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Metal organic frameworks (MOFs) is a research hotspot in the solar fuel production and photo-degradation of pollutants field due to high surface area, rich metal/organic species, large pore volume, and adjustability of structures and compositions. Therefore, in this review, we first summarized the design factors of photocatalytic materials based on MOF from the perspective of “star” MOF. The modification strategies of MOFs-based photocatalysts were discussed to improve its photocatalytic activity and specific applications were summarized as well, including photocatalytic CO2 reduction, photocatalytic water splitting and photo-degradation of pollutants. Finally, the advantages and disadvantages of MOFs-based photocatalysts were discussed, the current challenges were highlighted, and suggestions for future research directions were proposed.
DOI : 10.1016/s1872-2067(20)63715-9
Anahtar Kelimeler : Design, Metal organic framework, Photocatalytic performance, Degradation of organic pollutants, CO2 reduction, H2 production
ISSN: 1872-2067
Sayı: 6
Cilt: 42
Sayfa: 872-903
17
Novel Fault Monitoring and Localization Scheme in WDM-PONs with Upstream VCSEL Transmitters
Konferans Bildirileri

Konferans Bildirileri
Kaynak :
IEEE Xplore
Yazar(lar) :
Elaine Wong , Xiaoxue Zhao , Connie J. Chang-Hasnain
Konu :
Photonics and Electrooptics, Components, Circuits, Devices and Systems, Engineered Materials, Dielectrics and Plasmas, Communication, Networking and Broadcast Technologies, Signal Processing and Analysis
Yıl :
2007
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A simple and highly-sensitive (-67 dBm) fault monitoring and localization scheme is achieved without modifications to the ONU, by utilizing a low bandwidth (~2 kHz) and low power (~-7 dBm) fault monitor and the high reflectivity mirror of VCSEL transmitters.
DOI : 10.1109/ofc.2007.4348664
Anahtar Kelimeler : Vertical cavity surface emitting lasers, Optical transmitters, Optical network units, Optical receivers, Optical modulation, Passive optical networks, Condition monitoring, Optical sensors, Bandwidth, Optical filters, fault location, optical fibre networks, optical transmitters, surface emitting lasers, telecommunication network reliability, wavelength division multiplexing, fault monitoring, fault localization, WDM-PON, upstream VCSEL transmitters, optical network unit
18
MOFs-derived C-In2O3/g-C3N4 heterojunction for enhanced photoreduction CO2
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Environmental Chemical Engineering
Yayıncı:
Elsevier BV
Yazar(lar) :
Mengyang Xu , Xiaoxue Zhao , Haopeng Jiang , Songtao Chen , Pengwei Huo
Yıl :
2021
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Converting carbon dioxide into valuable chemicals is seen as a promising strategy for slowing global warming while enriching energy supplies. Photocatalysts derived from Metal-Organic Frameworks (MOFs) can not only overcome the problem of poor stability of MOFs, but also inherit the advantages of MOFs to some extent. Herein, carbon doped In2O3 (C-In2O3) hollow tubular is synthesized by calcination of MIL-68(In) as sacrificial template. Then C-In2O3 and g-C3N4 are hydrothermal to obtain C-In2O3/g-C3N4 heterojunction. The unique hollow tubular structure, carbon doping and type-II heterojunction of C-In2O3/g-C3N4 expand the light absorption capacity and promote the separation of photogenerated electron-hole pairs, thus significantly improve the activity of photocatalytic reduction of CO2. Among them, C-In2O3/g-C3N4-5 shows the highest CO2 reduction activity towards CO (153.42 μmol/g/h) and CH4 (110.31 μmol/g/h).
DOI : 10.1016/j.jece.2021.106469
Anahtar Kelimeler : CO2 reduction, Metal-organic frameworks (MOFs) template, Hollow tubular, Type-II heterojunction
ISSN: 2213-3437
Sayfa: 106469
19
A Bayesian Hierarchical Model for Comparing Average F1 Scores
Konferans Bildirileri

Konferans Bildirileri
Kaynak :
IEEE Xplore
Yazar(lar) :
Dell Zhang , Jun Wang , Xiaoxue Zhao , Xiaoling Wang
Konu :
Computing and Processing, Signal Processing and Analysis
Yıl :
2015
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
In multi-class text classification, the performance (effectiveness) of a classifier is usually measured by micro-averaged and macro-averaged F1 scores. However, the scores themselves do not tell us how reliable they are in terms of forecasting the classifier's future performance on unseen data. In this paper, we propose a novel approach to explicitly modelling the uncertainty of average F1 scores through Bayesian reasoning, and demonstrate that it can provide much more comprehensive performance comparison between text classifiers than the traditional frequentist null hypothesis significance testing (NHST).
DOI : 10.1109/icdm.2015.44
Anahtar Kelimeler : Bayes methods, Estimation, Computational modeling, Data models, Uncertainty, Electronic mail, Testing, Bayes methods, inference mechanisms, pattern classification, text analysis, Bayesian hierarchical model, average F1 scores comparison, Bayesian reasoning, text classifiers, frequentist NHST, null hypothesis significance testing, text classification, performance evaluation, hypothesis testing, model comparison, Bayesian inference
20
A Genetic Algorithm to Filter SNPs for SNP Association Study
Konferans Bildirileri

Konferans Bildirileri
Kaynak :
IEEE Xplore
Yazar(lar) :
Junying Zhang , Shengli Jiang , Xiaoxue Zhao , Lan Liu
Konu :
Communication, Networking and Broadcast Technologies, Computing and Processing
Yıl :
2012
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Recent advances in human and medical genetics have made it widely accepted that complex diseases are speculated to be caused by multiple genetic variants, their interactive effects, and/or their interactions with environment factors. To find causative factors from genome-wide single-nucleotide polymorphisms (SNPs), SNP filtering is necessary and the key process for follow-up scientific-oriented causative factor discovery and causative interaction modeling. This paper proposes a novel genetic algorithm for SNP filtering. By introducing SNP frequency and using genetic algorithm, experiments on famous trunk data for feature selection, on SNP data for SNP filtering and on real AMD SNP dataset, indicate that the proposed algorithm is potential for both feature selection and feature filtering for genome-wide scale datasets.
DOI : 10.1109/wi-iat.2012.146
Anahtar Kelimeler : diseases, genetic algorithms, genetics, genomics, information filtering, interactive systems, medical information systems, vision, human genetics, medical genetics, complex diseases, multiple genetic variants, genome-wide single-nucleotide polymorphisms, follow-up scientific-oriented causative factor discovery, causative interaction modeling, SNP filtering, genetic algorithm, trunk data, feature selection, AMD SNP dataset, feature filtering, genome-wide scale datasets, single-nucleotide polymorphisms (SNPs), SNP filtering, feature selection, genetic algorithm
21
Effects of severe hallux valgus on metatarsal stress and the metatarsophalangeal loading during balanced standing: A finite element analysis.
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
PubMed
Dergi:
Comput. Biol. Med.
Yazar(lar) :
Yan Zhang , Jan Awrejcewicz , Olga Szymanowska , Siqin Shen , Xiaoxue Zhao , Julien S Baker , Yaodong Gu
Yıl :
2018
Xiaoxue Zhao
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
The internal stress of the human foot enables efficient parametric evaluation of structural and functional impairments associated with foot deformities, such as hallux valgus (HV). However, the status of the internal stress of such a deformed foot remains insufficiently addressed due to the difficulties and limitations of experimental approaches. This study, using finite element (FE) methodology, investigated the influence of severe HV deformity on the metatarsal stress and the metatarsophalangeal (MTP) joint loading during balanced standing. FE models of a normal foot and a severe HV were constructed and validated. Each FE model involves 28 bones and various cartilaginous structures, ligaments, and plantar fascia, as well as encapsulated soft tissue. All the materials except for the encapsulated soft tissue were considered isotropic and linearly elastic, while the encapsulated soft tissue was set as nonlinear hyperelastic. Hexahedral elements were assigned to the solid parts of bones, cartilage, and the encapsulated soft tissue. Link elements were assigned to ligaments and plantar fascia. A plate was created for simulating ground support. A vertical force of a half-body weight was applied on the bottom of the plate for simulating balanced standing loading. The superior surfaces of the encapsulated soft tissue, distal tibia, and distal fibula were fixed. Stress distribution in the metatarsals, contact pressure, and force at the MTP joints were comparatively analysed. Compared to the normal foot, the HV foot showed higher stress concentration in the metatarsals but lower magnitude of MTP joint loading. In addition, the region with high contact pressure at the first MTP joint shifted medially in the HV foot. Knowledge of this study indicates that patients with severe HV deformity are at higher risk of metatarsal injuries and functional impairment of the MTP joints while weight bearing.
DOI : 10.1016/j.compbiomed.2018.04.010
Anahtar Kelimeler : Finite element, Metatarsal stress, Metatarsophalangeal loading, Severe hallux valgus
Sınıflandırma :
22
Analyzing the effect of an arch support functional insole on walking and jogging in young, healthy females.
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
PubMed
Dergi:
Technol Health Care
Yazar(lar) :
Xiaoxue Zhao , Meizi Wang , Gusztáv Fekete , Julien S Baker , Huw Wiltshire , Yaodong Gu
Yıl :
2018
Xiaoxue Zhao
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
The aim of this study was to explore the effectiveness of arch support functional insoles to prevent metatarsalgia.
DOI : 10.3233/THC-181373
Anahtar Kelimeler : Arch support, biomechanics, gait, insoles
Sınıflandırma :
23
A novel PAX9 mutation found in a Chinese patient with hypodontia via whole exome sequencing.
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
PubMed
Dergi:
Oral Dis
Yazar(lar) :
Tingting Zhang , Xiaoxue Zhao , Feifei Hou , Yanwei Sun , Jing Wu , Tengfei Ma , Xiangyu Zhang
Yıl :
2018
Xiaoxue Zhao
Piri Tam Metin Bulucu
Kaydet Alıntıla
To investigate a novel gene mutation in a Chinese patient with non-syndromic hypodontia.
DOI : 10.1111/odi.12982
Anahtar Kelimeler : BMP4 gene, PAX9 gene, mutation, non-syndromic hypodontia, whole exome sequencing
Sınıflandırma :
24
Spatial Distribution and Correlative Study of the Total and the Available Heavy Metals in Soil From a Typical Lead Smelting Area, China
Dergi Makalesi

Dergi Makalesi
Kaynak :
Taylor and Francis
Dergi:
Soil and Sediment Contamination: An International Journal
Yayıncı:
Informa UK Limited
Yazar(lar) :
Linlin Zhang , Shijian Dai , Xiaoxue Zhao , Wei Nie , Jungang Lv
Konu :
Soil Science, Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry
Yıl :
2018
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Representative soil samples (n = 453) were collected from a lead smelting area in central China. The total and the available contents of several hazardous elements, including lead, cadmium, arsenic and mercury were determined. Inorganic acid were used for the pretreatment of the total element analysis. DTPA (Diethylene triamine pentacetate acid) digestion, an effective pretreatment procedure for the biological availability assessment of heavy metals, was used for bio-available assessment in this study. Graphite furnace atomic absorption spectrometry (GFAAS), inductively coupled plasma-optical emission spectrometer (ICP-OES) and inductively coupled plasma-mass spectrometry (ICP-MS) were employed for the instrumental analysis. The results indicated that the soil samples were seriously polluted by mercury, arsenic, lead and cadmium around the smelting factories, comparing to many other cities in China. Spatial distributions of the metal contents were then illustrated with maps. For 220 samples in pollution areas, average bio-effectiveness rates of cadmium, lead, mercury and arsenic in soils were 25.9%, 17.2%, 0.58% and 0.11%, respectively. The relationships of the total and the available contents of metals were investigated, among which lead and cadmium were found to can be expressed as linear and power function. These equations were tested inversely and further verified by the data from six randomly selected sites. The results will be helpful to assess the bioavailable contents of lead and cadmium fast and accurately only by the total contents and functional calculation in similar study.
DOI : 10.1080/15320383.2018.1489373
Anahtar Kelimeler : Lead smelting area, heavy metal, biological availability, correlative study
ISSN: 1532-0383
Sayı: 7
Cilt: 27
Sayfa: 563-572
25
Development of a Sensitive and Reliable UHPLC-MS/MS Method for the Determination of Multiple Urinary Biomarkers of Mycotoxin Exposure
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Toxins
Yazar(lar) :
Zhezhe Liu , Xiaoxue Zhao , Libiao Wu , Shuang Zhou , Zhiyong Gong , Yunfeng Zhao , Yongning Wu
Yıl :
2020
Xiaoxue Zhao
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
A variety of mycotoxins from different sources frequently contaminate farm products, presenting a potential toxicological concern for animals and human. Mycotoxin exposure has been the focus of attention for governments around the world. To date, biomarkers are used to monitor mycotoxin exposure and promote new understanding of their role in chronic diseases. The goal of this research was to develop and validate a sensitive UHPLC-MS/MS method using isotopically-labeled internal standards suitable for accurate determination of 18 mycotoxin biomarkers, including fumonisins, ochratoxins, Alternaria and emerging Fusarium mycotoxins (fumonisin B1, B2, and B3, hydrolyzed fumonisin B1 and B2, ochratoxin A, B, and alpha, alternariol, alternariol monomethyl ether, altenuene, tentoxin, tenuazonic acid, beauvericin, enniatin A, A1, B, and B1) in human urine. After enzymatic digestion with β-glucuronidase, human urine samples were cleaned up using HLB solid phase extraction cartridges prior to instrument analysis. The multi-mycotoxin and analyte-specific method was validated in-house, providing satisfactory results. The method provided good linearity in the tested concentration range (from LOQ up to 25−500 ng/mL for different analytes), with R2 from 0.997 to 0.999. The limits of quantitation varied from 0.0002 to 0.5 ng/mL for all analytes in urine. The recoveries for spiked samples were between 74.0% and 133%, with intra-day precision of 0.5%−8.7% and inter-day precision of 2.4%−13.4%. This method was applied to 60 urine samples collected from healthy volunteers in Beijing, and 10 biomarkers were found. At least one biomarker was found in all but one of the samples. The high sensitivity and accuracy of this method make it practical for human biomonitoring and mycotoxin exposure assessment.
DOI : 10.3390/toxins12030193
Anahtar Kelimeler : human biomonitoring, emerging mycotoxins, metabolites, biomarkers, urine, uhplc-ms/ms
ISSN: 2072-6651
Cilt: 12
Sayı: 3
Sayfa: 193
Sınıflandırma :
Kimya %100
Kromatografi %97
26
Fabricated hierarchical CdS/Ni-MOF heterostructure for promoting photocatalytic reduction of CO2
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Applied Surface Science
Yayıncı:
Elsevier BV
Yazar(lar) :
Mengyang Xu , Chao Sun , Xiaoxue Zhao , Haopeng Jiang , Huiqin Wang , Pengwei Huo
Yıl :
2022
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Fabricating the hierarchical heterostructure is efficient way for enhancing CO2 conversion of semiconductor photocatalysts. Herein, a simple strategy has been employed to prepare several 3D hierarchical CdS/Ni-MOF heterostructure photocatalysts, and the selective photoreduction of CO2 to CO under simulated sunlight in the gas–solid phase reactor. Among the prepared photocatalysts, 20%-CdS/Ni-MOF shows the best CO yield, which was 16 times and 7 times that of Ni-MOF and CdS, respectively. By controlling the morphology of the catalyst, we found that the significant improvement in photocatalytic activity can be ascribed to the synergistic effect of heterostructure in CdS/Ni-MOF and its unique hierarchical structure, which can improve the efficiency of charge transmission and provides abundant active sites, etc. Finally, the preliminary photocatalytic mechanism was discussed by in situ FTIR and liquid ultraviolet spectrophotometer.
DOI : 10.1016/j.apsusc.2021.151792
Anahtar Kelimeler : CO2 reduction, Ni-MOF, Hierarchical structure, Heterostructure
ISSN: 0169-4332
Cilt: 576
Sayfa: 151792
27
Enhanced H2O2 electrosynthesis on kneading oxidized carbon nanotubes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Applied Surface Science
Yayıncı:
Elsevier BV
Yazar(lar) :
Guanqing Ding , Changlong Li , Wendong Liu , Xiaoxue Zhao , Yuanyuan Jiang , Yizhong Lu
Yıl :
2022
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1016/j.apsusc.2021.152293
ISSN: 0169-4332
Cilt: 580
Sayfa: 152293
28
A novel missense mutation of LRP6 identified by whole‐exome sequencing in a Chinese family with nonsyndromic tooth agenesis
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Orthodontics & Craniofacial Research
Yazar(lar) :
Huijuan Wang , Yi Liu , Yafei Zheng , Xiaoxue Zhao , Shiyi Lin , Qin Zhang , Xiangyu Zhang
Konu :
Surgery, Orthodontics, Oral Surgery, Otorhinolaryngology
Yıl :
2020
Xiaoxue Zhao
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1111/ocr.12424
ISSN: 1601-6335

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