A5101716412- Topic Modeling
- Information Retrieval and Search Behavior
- Web Data Mining and Analysis
- Semantic Web and Ontologies
- Advanced Text Analysis Techniques
- Data Management and Algorithms
- Graphene research and applications
- 2D Materials and Applications
- Recommender Systems and Techniques
- Natural Language Processing Techniques
- Advanced Image and Video Retrieval Techniques
- Data Quality and Management
- MXene and MAX Phase Materials
- Biomedical Text Mining and Ontologies
- Expert finding and Q&A systems
- Advanced Database Systems and Queries
- Image Retrieval and Classification Techniques
- Text and Document Classification Technologies
- Nanowire Synthesis and Applications
- Mobile Crowdsensing and Crowdsourcing
- Computer Graphics and Visualization Techniques
- Boron and Carbon Nanomaterials Research
- Caching and Content Delivery
- Machine Learning and Algorithms
- Domain Adaptation and Few-Shot Learning
University of Delaware
2015-2024
Jiangxi Provincial People's Hospital
2022-2024
Nankai University
2024
First Affiliated Hospital of Jiangxi Medical College
2024
Inner Mongolia Agricultural University
2024
Zaozhuang University
2024
Harbin Engineering University
2023
Loughborough University
2022-2023
South China University of Technology
2023
Fujian University of Technology
2023
We report high performance p-type field-effect transistors based on single layered (thickness, ∼0.7 nm) WSe(2) as the active channel with chemically doped source/drain contacts and high-κ gate dielectrics. The top-gated monolayer exhibit a effective hole mobility of ∼250 cm(2)/(V s), perfect subthreshold swing ∼60 mV/dec, I(ON)/I(OFF) >10(6) at room temperature. Special attention is given to lowering contact resistance for injection by using work function Pd along degenerate surface doping...
Semiconductor heterostructures are the fundamental platform for many important device applications such as lasers, light-emitting diodes, solar cells, and high-electron-mobility transistors. Analogous to traditional heterostructures, layered transition metal dichalcogenide can be designed built by assembling individual single layers into functional multilayer structures, but in principle with atomically sharp interfaces, no interdiffusion of atoms, digitally controlled components, lattice...
We report here the first degenerate n-doping of few-layer MoS2 and WSe2 semiconductors by surface charge transfer using potassium. High-electron sheet densities ~1.0 × 10(13) cm(-2) 2.5 10(12) for are obtained, respectively. In addition, top-gated n-FETs with selective K doping at metal source/drain contacts fabricated shown to exhibit low contact resistances. Uniquely, reported time, exhibiting an electron mobility ~110 cm(2)/V·s, which is comparable hole previously p-FETs same material. Ab...
Transition metal dichalcogenides, such as MoS2 and WSe2, have recently gained tremendous interest for electronic optoelectronic applications. WSe2 monolayers are direct bandgap show bright photoluminescence (PL), whereas multilayers exhibit much weaker PL due to their indirect optical bandgap. This presents an obstacle a number of device applications involving light harvesting or detection where thicker films with desired. Here, we experimentally demonstrate drastic enhancement in intensity...
Two-dimensional layered semiconductors present a promising material platform for band-to-band-tunneling devices given their homogeneous band edge steepness due to atomically flat thickness. Here, we experimentally demonstrate interlayer band-to-band tunneling in vertical MoS2/WSe2 van der Waals (vdW) heterostructures using dual-gate device architecture. The electric potential and carrier concentration of MoS2 WSe2 layers are independently controlled by the two symmetric gates. same can be...
The development of low-resistance source/drain contacts to transition-metal dichalcogenides (TMDCs) is crucial for the realization high-performance logic components. In particular, efficient hole are required fabrication p-type transistors with MoS2, a model TMDC. Previous studies have shown that Fermi level elemental metals pinned close conduction band thus resulting in large Schottky barrier heights holes limited injection from contacts. Here, we show substoichiometric molybdenum trioxide...
Software toolkits play an essential role in information retrieval research. Most open-source developed by academics are designed to facilitate the evaluation of models over standard test collections. Efforts generally directed toward better ranking and less attention is usually given scalability other operational considerations. On hand, Lucene has become de facto platform industry for building search applications (outside a small number companies that deploy custom infrastructure). Compared...
In this work, the operation of n- and p-type field-effect transistors (FETs) on same WSe2 flake is realized,and a complementary logic inverter demonstrated. The p-FET fabricated by contacting with high work function metal, Pt, which facilities hole injection at source contact. n-FET realized utilizing selective surface charge transfer doping potassium to form degenerately doped n+ contacts for electron injection. An ON/OFF current ratio >10(4) achieved both p-FETs similar ON densities. A dc...
Metal-catalyzed crystallization of amorphous carbon to graphene by thermal annealing is demonstrated. In this “limited source” process scheme, the thickness precipitated directly controlled initial layer. This in contrast chemical vapor deposition processes, where source virtually unlimited and controlling number layers depends on tight control over a parameters. Based Raman analysis, quality comparable other synthesis methods found literature, such as deposition. The ability synthesize...
This work tackles the perennial problem of reproducible baselines in information retrieval research, focusing on bag-of-words ranking models. Although academic researchers have a long history building and sharing systems, they are primarily designed to facilitate publication research papers. As such, these systems often incomplete, inflexible, poorly documented, difficult use, slow, particularly context modern web-scale collections. Furthermore, growing complexity software ecosystems...
Empirical studies of information retrieval methods show that good performance is closely related to the use various heuristics, such as TF-IDF weighting. One basic research question thus what exactly are these necessary heuristics seem cause performance. In this paper, we present a formal study heuristics. We formally define set desirable constraints any reasonable function should satisfy, and check on variety representative functions. find none functions satisfies all unconditionally....
Existing retrieval models generally do not offer any guarantee for optimal performance. Indeed, it is even difficult, if impossible, to predict a model's empirical performance analytically. This limitation at least partly caused by the way existing are developed where relevance only coarsely modeled level of documents and queries as opposed finer granularity terms. In this paper, we present new axiomatic approach developing based on direct modeling with formalized constraints defined The...
Negative relevance feedback is a special case of where we do not have any positive example; this often happens when the topic difficult and search results are poor. Although in principle standard technique can be applied to negative feedback, it may perform well due lack examples. In paper, conduct systematic study methods for feedback. We compare set representative methods, covering vector-space models language models, as several heuristics Evaluating requires test with sufficient topics,...
A common limitation of many retrieval models, including the recently proposed axiomatic approaches, is that scores are solely based on exact (i.e., syntactic) matching terms in queries and documents, without allowing distinct but semantically related to match each other contribute score. In this paper, we show semantic term can be naturally incorporated into model through defining primitive weighting function a similarity terms. We define several desirable constraints for use such extend...
Developing effective retrieval models is a long-standing central challenge in information research. In order to develop more models, it necessary understand the deficiencies of current and relative strengths each them. this article, we propose general methodology analytically experimentally diagnose weaknesses function, which provides guidance on how further improve its performance. Our motivated by empirical observation that good performance closely related use various heuristics. We...
Trust has been used to replace or complement rating-based similarity in recommender systems, improve the accuracy of rating prediction. However, people trusting each other may not always share similar preferences. In this paper, we try fill gap by decomposing original single-aspect trust information into four general aspects, i.e. benevolence, integrity, competence, and predictability, further employing support vector regression technique incorporate them probabilistic matrix factorization...
Here, we present the fabrication and electrical analysis of InAs/WSe2 van der Waals heterojunction diodes formed by transfer ultrathin membranes one material upon another. Notably, InAs WSe2 are two materials with completely different crystal structures, which is inconceivable traditional epitaxial growth techniques. Clear rectification from n-InAs/p-WSe2 junction (forward/reverse current ratio >106) observed. A low reverse bias <10−12A/μm2 ideality factor ∼1.1 were achieved,...
Single-crystal SnSe2 nanosheets with a ten atomic-layer thickness have been prepared by facile solvothermal route reaction in benzyl alcohol the presence of PVP. Benzyl acts as solvent and reducing reagent to promote formation hexagonal phase SnSe2, PVP provides stable environment for construction nanosheets. A reasonable mechanism was put forward on basis time-dependent experiments. The obtained displayed an enhanced photocurrent compared thick nanoplates, which indicated potential...
Edwin Zhang, Nikhil Gupta, Raphael Tang, Xiao Han, Ronak Pradeep, Kuang Lu, Yue Rodrigo Nogueira, Kyunghyun Cho, Hui Fang, Jimmy Lin. Proceedings of the First Workshop on Scholarly Document Processing. 2020.
We combine existing techniques for shape-from-shading and texture synthesis to create a new tool texturing objects in photographs. Our approach clusters pixels with similar recovered normals into patches on which is synthesized. Distorting the based creates illusion that adheres undulations of photographed surface. Inconsistencies surface are disguised by graphcut blending individually textured patches. Further applications include generation detail manually-shaded painting, extracting...
Gd‐doped CaMnO 3 were synthesized by two methods: a coprecipitation route and conventional solid‐state reaction. The ceramic samples obtained the method possess nanometer‐scale grains but grain sizes reaction are several micrometers. Our results show that electrical conductivity is slightly decreased with decreasing size, which indicates fine‐grained ceramics can maintain good property. However, thermal values of sample relatively low due to enhancement boundary scattering. highest...