Personne

Jiyong Zhang

Cette personne n’est plus à l’EPFL

Disagreement and fragmentation in growing groups

The arise of disagreement is an emergent phenomenon that can be observed within a growing social group and, beyond a certain threshold, can lead to group fragmentation. To better understand how disagreement emerges, we introduce an analytically tractable m ...

PERGAMON-ELSEVIER SCIENCE LTD2023

An Adaptive IoT Network Security Situation Prediction Model

Jiyong Zhang

With the rapid development of the Internet of things (IoT) technology, how to effectively predict the network security situation of the IoT has become particularly important. It is difficult to quantify the IoT network situation due to a large number of hi ...

SPRINGER2021

A Key Business Node Identification Model for Internet of Things Security

Jiyong Zhang

Based on the research of business continuity and information security of the Internet of Things (IoT), a key business node identification model for the Internet of Things security is proposed. First, the business nodes are obtained based on the business pr ...

2020

New Multi-Keyword Ciphertext Search Method for Sensor Network Cloud Platforms

Jiyong Zhang, Hongyu Yang, Yue Wang

This paper proposed a multi-keyword ciphertext search, based on an improved-quality hierarchical clustering (MCS-IQHC) method. MCS-IQHC is a novel technique, which is tailored to work with encrypted data. It has improved search accuracy and can self-adapt ...

MDPI2018

Predictors of Life Satisfaction based on Daily Activities from Mobile Sensor Data

Pearl Pu Faltings, Jiyong Zhang, Onur Yürüten

In recent years much research work has been dedicated to detecting user activity patterns from sensor data such as location, movement and proximity. However, how daily activities are correlated to people's happiness (such as their satisfaction from work an ...

2014

A Visual Interface for Critiquing-based Recommender Systems

Pearl Pu Faltings, Nicolas Jones, Jiyong Zhang

Critiquing-based recommender systems provide an efficient way for users to navigate through complex product spaces even if they are not familiar with the domain details in e-commerce environments. While recent research has mainly concentrated on methods fo ...

Acm Order Department, P O Box 64145, Baltimore, Md 21264 Usa2008

Design and evaluation issues for user-centric online product search

Jiyong Zhang

Nowadays more and more people are looking for products online, and a massive amount of products are being sold through e-commerce systems. It is crucial to develop effective online product search tools to assist users to find their desired products and to ...

EPFL2008

Evaluating compound critiquing recommenders: A real-user study

Pearl Pu Faltings, Jiyong Zhang

Conversational recommender systems are designed to help users to more efficiently navigate complex product spaces by alternatively making recommendations and inviting users' feedback. Compound critiquing techniques provide an efficient way for users to fee ...

Association for Computing Machinery, New York, NY 10036-5701, United States2007

Refining preference-based search results through Bayesian filtering

Pearl Pu Faltings, Jiyong Zhang

Preference-based search (PBS) is a popular approach for helping consumers find their desired items from online catalogs. Currently most PBS tools generate search results by a certain set of criteria based on preferences elicited from the current user durin ...

Association for Computing Machinery, New York, NY 10036-5701, United States2007

A comparison of two compound critiquing systems

Pearl Pu Faltings, Jiyong Zhang

Compound critiques allow users to simultaneously express directional preferences over several product attributes. Presenting the user with compound critiques is not a new idea. The original Find-Me Systems (e.g., Car Navigator) showed static compound criti ...

Association for Computing Machinery, New York, NY 10036-5701, United States2007