Publications by Wei Liu | EPFL Graph Search

Related publications (19)

Ultrafast carrier dynamics in III-nitride nanostructures and LED quantum efficiency

Since the seminal report about the first Candela- class-brightness InGaN blue light- emitting diodes (LEDs) by Shuji Nakamura et al. in 1994, III-nitride semiconductors have been one of the most important platforms for optoelectronic devices. The achieve ...

EPFL2019

Effectiveness of variable speed limits considering commuters' long-term response

Wei Liu

This paper examines the effectiveness of variable speed limits (VSLs) on improving traffic flow efficiency and reducing vehicular emissions in a stylized setting of morning commute where a fixed number of individuals commute from home to work through the f ...

Pergamon-Elsevier Science Ltd2015

The Forward Physics Facility at the High-Luminosity LHC

Alexey Boyarsky, Enrico Bertuzzo, Lesya Shchutska, Francesco Cerutti, Wei Liu, Yi Zhang, Raffaele Tito D'Agnolo, Yiming Li

High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located s ...

2023

Modeling the morning commute for urban networks with cruising-for-parking: An MFD approach

Nikolaos Geroliminis, Wei Liu

This study focuses on the morning commute problem with explicit consideration of cruising-for-parking, and its adverse impacts on traffic congestion. The cruising-for-parking is modeled through a dynamic aggregated traffic model for networks: the Macroscop ...

Elsevier2016

From LDPC Block to LDPC Convolutional Codes: Capacity, Stability, and Universality

Wei Liu, Wei Liu

In his landmark paper "A Mathematical Theory of Communication," the founding father of information theory and coding theory, Claude E. Shannon, established the largest rate at which reliable communication is possible and he revealed that the key to this re ...

EPFL2019

GaN buffer growth temperature and efficiency of InGaN/GaN quantum wells: The critical role of nitrogen vacancies at the GaN surface

Jean-François Carlin, Nicolas Grandjean, Wei Liu, Yao Chen

An indium-containing layer positioned underneath the InGaN/GaN quantum well (QW) active region is commonly used in high efficiency blue light-emitting diodes. Recent studies proposed that the role of this underlayer is to trap surface defects (SDs), which, ...

AIP Publishing2021

Novel photoelectric material of perovskite-like (CH3)(3)SPbI3 nanorod arrays with high stability

Mohammad Khaja Nazeeruddin, Tom Theodorus Antonius Lummen, Wei Liu

Organometallic halide perovskite materials make great achievements in optoelectronic fields, especially in solar cells, in which the organic cations contain amine components. However, the amine with N-H bonds is easily hydrolyzed with moisture in the air, ...

2021

Imaging Nonradiative Point Defects Buried in Quantum Wells Using Cathodoluminescence

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Duncan Thomas Lindsay Alexander, Wei Liu, Wei Liu, Thomas Fjord Kjaersgaard Weatherley

Crystallographic point defects (PDs) can dramatically decrease the efficiency of optoelectronic semiconductor devices, many of which are based on quantum well (QW) heterostructures. However, spatially resolving individual nonradiative PDs buried in such QW ...

AMER CHEMICAL SOC2021

The Stability of Low-Density Parity-Check Codes and Some of its Consequences

Rüdiger Urbanke, Wei Liu

We study the stability of low-density parity-check codes under blockwise or bitwise maximum a posteriori decoding, where transmission takes place over a binary-input memoryless output-symmetric channel. Our study stems from the consideration of constructin ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

Pyramid Architecture Search for Real-Time Image Deblurring

Wei Liu, Kaicheng Yu

Multi-scale and multi-patch deep models have been shown effective in removing blurs of dynamic scenes. However, these methods still suffer from one major obstacle: manually designing a lightweight and high-efficiency network is challenging and time-consumi ...

IEEE2021

Efficiency of a highway use reservation system for morning commute

Wei Liu

This paper examines the design and efficiency of a highway use reservation system where commuters need reservations to access a highway facility at specific times. We show that, by accommodating reservation requests to the level that the highway capacity a ...

Pergamon-Elsevier Science Ltd2015

Managing morning commute with parking space constraints in the case of a bi-modal many-to-one network

Wei Liu

Recently, some studies examined how downtown parking space limitation re-shapes the morning commute in the case of a single origin-destination network. This paper further formulates and analyses the commuting equilibrium problem of both mode and departure ...

Taylor & Francis Ltd2016

On the Universality of Low-Density Parity-Check Block Codes

Rüdiger Urbanke, Wei Liu

An important class of modern channel codes is the capacity-achieving sequences of low-density parity-check block codes. Such sequences are usually designed for the binary erasure channel and are decoded by iterative message-passing algorithms. In this pape ...

IEEE2020

The Stability Condition of LDPC Codes Under MAP Decoding

Rüdiger Urbanke, Wei Liu

We determine the stability condition of low-density parity-check codes under both bitwise and blockwise maximum a posteriori decoding. As a consequence, we prove that the stability condition determines an upper bound on both the bitwise and the blockwise m ...

IEEE2018

The Least Degraded and the Least Upgraded Channel with respect to a Channel Family

Rüdiger Urbanke, Seyed Hamed Hassani, Wei Liu, Wei Liu

Given a family of binary-input memoryless output-symmetric (BMS) channels having a fixed capacity, we derive the BMS channel having the highest (resp.lowest) capacity among all channels that are degraded (resp. upgraded) with respect to the whole family. W ...

Ieee2013

Wei Liu

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Ultrafast carrier dynamics in III-nitride nanostructures and LED quantum efficiency

Effectiveness of variable speed limits considering commuters' long-term response

The Forward Physics Facility at the High-Luminosity LHC

Modeling the morning commute for urban networks with cruising-for-parking: An MFD approach

From LDPC Block to LDPC Convolutional Codes: Capacity, Stability, and Universality

GaN buffer growth temperature and efficiency of InGaN/GaN quantum wells: The critical role of nitrogen vacancies at the GaN surface

Novel photoelectric material of perovskite-like (CH3)(3)SPbI3 nanorod arrays with high stability

Imaging Nonradiative Point Defects Buried in Quantum Wells Using Cathodoluminescence

The Stability of Low-Density Parity-Check Codes and Some of its Consequences

Pyramid Architecture Search for Real-Time Image Deblurring

Efficiency of a highway use reservation system for morning commute

Managing morning commute with parking space constraints in the case of a bi-modal many-to-one network

On the Universality of Low-Density Parity-Check Block Codes

The Stability Condition of LDPC Codes Under MAP Decoding

The Least Degraded and the Least Upgraded Channel with respect to a Channel Family

Doubly dynamics for multi-modal networks with park-and-ride and adaptive pricing

Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition)

Integrated analysis for Transportation Systems in the Connected Era

Multi-modal Transportation System Dynamics with Park-and-ride and Adaptive Pricing