Team Integration

We leverage theoretical advances and the multi-user nature of \emph{argumentation}. The overall contributions of our work are as follows. We model the schema matching network and the reconciliation process, where we relate the experts' assertions and the constraints of the matching network to an \emph{argumentation framework}. Our representation not only captures the experts' belief and their explanations, but also enables to reason about these captured inputs. On top of this representation, we develop support techniques for experts to detect conflicts in a set of their assertions. Then we guide the conflict resolution by offering two primitives: \emph{conflict-structure interpretation} and \emph{what-if analysis}. While the former presents meaningful interpretations for the conflicts and various heuristic metrics, the latter can greatly help the experts to understand the consequences of their own decisions as well as those of others. Last but not least, we implement an argumentation-based negotiation support tool for schema matching (ArgSM), which realizes our methods to help the experts in the collaborative task

A Survey of Privacy on Data Integration

This survey is an integrated view of other surveys on privacy preserving for data integration. First, we review the database context and challenges and research questions. Second, we formulate the privacy problems for schema matching and data matching. Next, we introduce the elements of privacy models. Then, we summarize the existing privacy techniques and the analysis (proofs) of privacy guarantees. Finally, we describe the privacy frameworks and their applications

Study of Factors Affecting the Leadership Capacity of CEO in Industrial SMEs in Vietnam

The leadership capabilities of management team greatly influence the performance of management activities in an enterprise. Capturing and evaluating the impact of elements influencing leadership ability might help enterprises to formulate policies to optimize the capacity of the management team. The scope of the study in this paper is the survey of SMEs in Vietnam. The research team conducted 141 surveys by executives and managers working as heads of departments within current industrial SMEs in Vietnam. Research has indicated the three influential factors including self-efficacy, environment and personal characteristics, with personal traits making the least impact. Keywords: Leadership capabilities, CEO, small and medium industry enterprises

Ecpoc: an evolutionary computation-based proof of criteria consensus protocol

Recently, blockchain technology has been applied in many domains in our life. Blockchain networks typically utilize a consensus protocol to achieve consistency among network nodes in a decentralized environment. Delegated Proof of Stake (DPoS) is a popular mechanism adopted in many networks such as BitShares, EOS, and Cardano because of its speed and scalability advantages. However, votes that come from nodes on a DPoS network tend to support a set of specific nodes that have a greater chance of becoming block producers after voting rounds. Therefore, only a small group of nodes can be selected to become block producers. To address this issue, we propose a new protocol called Evolutionary Computation-based Proof of Criteria (ECPoC), which uses ten criteria to evaluate and select a new block procedure in each round. Next, a set of optimal weights used for maximizing the network’s decentralization level is identified through the use of evolutionary computation algorithms. The experimental results show that our consensus significantly enhances the degree of decentralization in the selection process of witness nodes compared to DPoS. As a result, ECPoC facilitates fairness between nodes and creates momentum for blockchain network developmen

Tag-based Paper Retrieval: Minimizing User Effort with Diversity Awareness

As the number of scientific papers getting published is likely to soar, most of modern paper management systems (e.g. ScienceWise, Mendeley, CiteULike) support tag-based retrieval. In that, each paper is associated with a set of \emph{tags}, allowing user to search for relevant papers by formulating tag-based queries against the system. One of the most critical issues in tag-based retrieval is that user often has difficulties in precisely formulating his information need. Addressing this issue, our paper tackles the problem of automatically suggesting new tags for user when he formulates a query. The set of tags are selected in such a way that resolves query ambiguity in two aspects: \emph{informativeness} and \emph{diversity}. While the former reduces user effort in finding the desired papers, the latter enhances the variety of information shown to user. Through studying theoretical properties of this problem, we propose a heuristic-based algorithm with several salient performance guarantees. We also demonstrate the efficiency of our approach through extensive experimentation using real-world datasets

Privacy-Preserving Schema Reuse

As the number of schema repositories grows rapidly and several web-based platforms exist to support publishing schemas, \emph{schema reuse} becomes a new trend. Schema reuse is a methodology that allows users to create new schemas by copying and adapting existing ones. This methodology supports to reduce not only the effort of designing new schemas but also the heterogeneity between them. One of the biggest barriers of schema reuse is about privacy concerns that discourage schema owners from contributing their schemas. Addressing this problem, we develop a framework that enables privacy-preserving schema reuse. Our framework supports the contributors to define their own protection policies in the form of \emph{privacy constraints}. Instead of showing original schemas, the framework returns an \emph{anonymized schema} with maximal \emph{utility} while satisfying these privacy constraints. To validate our approach, we empirically show the efficiency of different heuristics, the correctness of the proposed utility function, the computation time, as well as the trade-off between utility and privacy

Towards Enabling Schema Reuse with Privacy Constraints

As the number of schema repositories grows rapidly and several web-based platforms exist to support publishing schemas, \emph{schema reuse} becomes a new trend. Schema reuse is a methodology that allows users to create new schemas by copying and adapting existing ones. This methodology supports to reduce not only the effort of designing new schemas but also the heterogeneity between them. One of the biggest barriers of schema reuse is privacy concerns that discourage the participants from contributing their schemas. Addressing this problem, we develop a framework that enables privacy-preserving schema reuse. To this end, our framework supports users to define their own protection policies in the form of \emph{privacy constraints}. Instead of showing original schemas, the framework returns an \emph{anonymized schema} with maximal \emph{utility} while satisfying these privacy constraints. To validate our approach, we empirically show the efficiency of different heuristics, the correctness of the proposed utility function, the computation time, as well as the trade-off between utility and privacy

ĐẶC TRƯNG QUANG PHỔ CỦA VẬT LIỆU Ca2Al2SiO7 ĐỒNG PHA TẠP Ce3+ VÀ Sm3+

Luminescent materials Ca2Al2SiO7 co-doped with Ce3+ and Sm3+ were prepared with the solid-state reaction method. The XRD diffraction patterns show that the samples have a single tetragonal phase structure. The luminescent spectra of Ca2Al2SiO7: Ce3+,Sm3+ phosphor have a broad band with a peak at 420 nm, characterizing the transition of the electronic configuration of Ce3+ ion and narrow lines peaked at about 563, 602, 645, and 712 nm, representing the transition of the Sm3+ ion. The energy transfer from Ce3+ to Sm3+ was presented and discussed.Vật liệu phát quang Ca2Al2SiO7 đồng pha tạp Ce3+ và Sm3+ được chế tạo bằng phương pháp phản ứng pha rắn. Giản đồ nhiễu xạ tia X cho thấy vật liệu có cấu trúc pha tứ giác. Phổ bức xạ của vật liệu Ca2Al2SiO7:Ce3+,Sm3+ gồm một dải rộng có cực đại bức xạ ở bước sóng 420 nm, đặc trưng cho chuyển dời của ion Ce3+ và các vạch hẹp ở bước sóng 563, 602, 645 và 712 nm đặc trưng cho chuyển dời của ion Sm3+. Hiện tượng truyền năng lượng từ ion Ce3+ sang ion Sm3+ cũng được trình bày và thảo luận