Publications de Na Li | EPFL Graph Search

Theoretical explanation of passivation behavior in OFP-Cu and OF-Cu

This research presents a comprehensive comparative analysis of the passivation kinetics of OFP-Cu and OF-Cu in simulated repository electrolyte. The study employs a range of techniques, including potentiodynamic polarization, multi-step potentiostatic pola ...

Pergamon-Elsevier Science Ltd2024

Correlated states in twisted double bilayer graphene

Oleg Yazyev, Na Li, Quansheng Wu, Jian Tang, Rong Yang, Cheng Shen

Electron-electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle(1-7). For bilayer graphene where the two layers are twisted by the 'magic a ...

NATURE PUBLISHING GROUP2020

Increasing heart vascularisation after myocardial infarction using brain natriuretic peptide stimulation of endothelial and WT1(+) epicardial cells

Na Li, Alexia Laurie Carboni

Brain natriuretic peptide (BNP) treatment increases heart function and decreases heart dilation after myocardial infarction (MI). Here, we investigated whether part of the cardioprotective effect of BNP in infarcted hearts related to improved neovascularis ...

2020

Regulatory T cells engineered with TCR signaling-responsive IL-2 nanogels suppress alloimmunity in sites of antigen encounter

Na Li, Li Tang

Adoptive cell transfer of ex vivo expanded regulatory T cells (T-r(egs)) has shown immense potential in animal models of auto- and alloimmunity. However, the effective translation of such T-reg therapies to the clinic has been slow. Because T-reg homeostas ...

2020

On Maintaining Linear Convergence of Distributed Learning and Optimization Under Limited Communication

Na Li, Hossein Shokri Ghadikolaei

In distributed optimization and machine learning, multiple nodes coordinate to solve large problems. To do this, the nodes need to compress important algorithm information to bits so that it can be communicated over a digital channel. The communication tim ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Personal Learning with Social Media : Reputation, Privacy and Identity Perspectives

Na Li

Social media platforms are increasingly used in recent years to support learning activities, especially for the construction of activity- and learner-centric personal learning environments (PLEs). This thesis investigates the solutions to four essential de ...

EPFL2015

Enforcing Privacy for Teenagers in Online Inquiry Learning Spaces

Denis Gillet, Na Li, Sten Govaerts, Adrian Christian Holzer

In the Go-Lab European project, we are investigating an online lab portal that enables students to perform personalized scientific experiments with online labs. To protect sensitive student data, such as user activity data and learning preferences, this pa ...

2014

A Responsive Design Approach for Supporting Mobile Access to Virtual and Remote Laboratories

Na Li

Remote and virtual laboratories aim to overcome typical constraints of traditional laboratories and offer access to laboratory experiments without location and time restrictions. Additionally, the continuous growth of mobile devices’ ownership, as well as ...

2014

Identifying Influential Scholars in Academic Social Media Platforms

Denis Gillet, Na Li

The emergence of social media has created new ways to publish scientific work, foster collaboration, and build professional connections in the research community. The rich data collected in social media platforms has provided new opportunities for assessin ...

2013

Using Social Media for Collaborative Learning in Higher Education: A Case Study

Denis Gillet, Na Li

This paper investigates the acceptability of using social media for collaborative learning in the context of higher education. A social media platform, Graasp, is used to support students’ learning activities in a project-based course. An evaluation of Gra ...

2012

A Social Media Platform in Higher Education

Denis Gillet, Christophe Salzmann, Sandy Ingram, Evgeny Bogdanov, Na Li

This paper reports on the successful use of Graasp, a social media platform, by university students for their collaborative work. Graasp features a number of innovations, such as administrator-free creation of collaborative spaces, context-aware recommenda ...

2012

Exploring Trust in Personal Learning Environments

Denis Gillet, Na Li, Maryam Najafian-Razavi

The design of effective trust and reputation mechanisms for personal learning environments (PLEs) is believed to be a promising research direction. In this paper, we propose a 4-dimensional trust model that complies with the specific requirements of PLEs. ...

2011

Trust-aware Privacy Control for Social Media

Denis Gillet, Na Li, Maryam Najafian-Razavi

Due to the huge exposure of personal information in social media, a challenge now is to design effective privacy mechanisms that protect against unauthorized access to social data. In this paper, a trust model for social media is first presented. Based on ...

2011

The 3A interaction model: towards bridging the gap between formal and informal learning

Denis Gillet, Sandy Ingram, Na Li

This paper discusses the adoption of bottom-up social software tools in formal learning environments. This is believed to enhance the learning experience of today’s young generation characterized by being technology savvy and keen on social networking. As ...

IEEE Computer Society2010

Using Social Software for Teamwork and Collaborative Project Management in Higher Education

Denis Gillet, Sandy Ingram, Na Li

This paper discusses the potential role of social software in supporting teamwork and collaborative project management in higher education. Based on the fact that social software has been widely spread among young students nowadays, using it for collaborat ...

Springer2010

Trust-Based Rating Prediction for Recommendation in Web 2.0 Collaborative Learning Social Software

Denis Gillet, Sandy Ingram, Na Li

Benefiting from the advent of social software, information sharing becomes pervasive. Personalized rating systems have emerged to evaluate the quality of user-generated content in open environment and provide recommendation based on users’ past experience. ...

2010