New PhD position at Technische Universität Ilmenau

New PhD position at Technische Universität  Ilmenau : ITN-5VC – Integrated Telematics for Next Generation 5G Vehicular Communications

Department of Electronic Engineering

 

About the Project

The Electronic Measurements and Signal Processing (EMS) Group at the Department of Electrical Engineering and Infor-mation Technology is offering a three-year position. This PhD student position is part of the Marie Skłodowska-Curie Innovative Training Network “ITN-5VC – Integrated Telematics for Next Generation 5G Vehicular Communications” , funded by the European Union’s Hori-zon 2020 Research and Innovation Program. The research of the Electronic Measurements and Signal Processing group (EMS) within the MSCA ITN-EID project focuses on modelling of electromagnetic wave propagation for multi-band and multi-link Vehicle-to-Everything (V2X) wireless links.
At Technische Universität Ilmenau, Germany, we have two ESR positions open (until February 15th 2021):

  • ESR4 on multi-link/multi-band channel modeling
  • ESR5 on joint communication and radar sensing (JCRS)

Entry requirements

  • Above-average university degree in electrical engineering, communications, electromagnetics or physics.
  • Very good knowledge in the fieldof radio propagation modelling and multi-antenna communication systems.
  • Well-founded knowledge in at least two of the following areas of application:
    – Channel sounding or channel measurement principle / technology.
    – Radio standards (e.g. LTE, 5G) and corresponding channel models.
    – Usage of tools for wireless ray tracing.
    – Model based data analysis and statistical fitting.
    – Machine learning and application to wireless communications.
  • Experience in MATLAB or Python.
  • Willingness and ability for academic writing and publications in the international framework.
  • Willingness to travel and mid-term research stays at partners within the “ITN-5VC”.
  • Very good English skills in a technical and scientific environment.

How to apply

Applicants must apply via the University’s online application system: 

The applicants must (at the 01.04.2021) be in the first four years of their research careers (measured as full-time equivalent from the date when they obtained the degree which would entitle them to embark on a doctorate). The applicants should not be in possession of a doctoral degree, but should have the necessary qualifications to embark on a doctorate. The ESR will be required to enrole in the PhD program. The applicant (regardless of his nationality) must not have resided or carried out their main activities (work, studies, etc.) in Germany for more than 12 months in the last 3 years.

Funding Notes

The successful candidate will receive an attractive salary in accordance with the MSCA regulations for Early Stage Research-ers. The exact salary will be confirmed upon appointment, but may vary between €35.500,00 and €.41.500,00 gross/year. The salary includes a living allowance, a mobility allowance and a family allowance (if criteria for granting are met). The PhD position is limited to 36 months.

Contact personProf. Dr. Thomä Reiner (reiner.thomae@tu-ilmenau.de )

For the description about the project click HERE.

For the full description about the ESR4 PhD position click HERE.

For the full description about the ESR5 PhD position click HERE.

Full-Time Academic position in Brussels School Of Engineering- Ecole Polytechnique

FULL-TIME ACADEMIC POSITION IN
EMBEDDED ELECTRONICS FOR SMART ENVIRONMENTS

BRUSSELS SCHOOL OF ENGINEERING – ECOLE POLYTECHNIQUE DE BRUXELLES

 

About the Job

The Brussels School of Engineering is hiring a full-time professor in the field of embedded electronics for smart environments. The candidate will be joining the BEAMS – Embedded Electronics research group, and will be teaching in the Bachelor of Engineering in Charleroi which ULB is coordinating in partnership
with UMons.

Entry requirements

The candidate should have a PhD in Electrical Engineering or Computer Science (with a focus on electronics or related field).

Skills requirements

  • Applicants should have at least 4 years of research experience at the time of their recruitment.
  • Post-doctoral experience and an excellent scientific record are a plus.
  • Exchange periods outside of the applicants’ home institution (during or after their PhD) will be  taken into consideration when evaluating applications.
  • You speak fluent French (level B2 or better), as well as English (level B2 or better)
  • You have experience in setting up and participating in research projects
  • You have experience in the different aspects of academic teaching: course coordination and organization, developing didactic tools, supervising student projects.

How to apply

Applications must be sent by e-mail to the rectorate of the Université Libre de Bruxelles(rectrice@ulb.be) and to the faculty deanship (le-doyen-polytech@ulb.be ).
They must include the following :

  •  an application letter
  • a Curriculum vitae including a list of publications : if you want you can complete a standard form via our website at https://www.ulb.be/fr/documents-officiels/completer-votre-cv-en-ligne. Once completed, it must be downloaded and attached to the application file.
  • any relevant documents showing 4 years of research experience
  • a 7,000-character report (4 pages) presenting the applicant’s research activities and a research
    project, including how these will integrate into ULB’s research teams
  • a teaching report including a 7,000-character report (4 pages) on the applicant’s previous teaching activities and a teaching project for the first five years in this position; these must be relevant to the faculty and to the teaching profiles for the programs to which the applicant is to contribute
  • a note on the applicant’s international achievements and projects (no more than 4 pages)
  • the names and e-mail addresses of five references (with equal gender representation) who may be contacted by those in charge of evaluating applications. These references should not have conflicts of interest because of family or emotional ties.

Funding Notes

The appointment to the academic staff of ULB is made at “Premier Assistant” level, if the candidate has had a PhD for less than eight years (on 1 October of the year of appointment). If the candidate has had a PhD for eight or more years, on 1 October of the year of appointment, then the appointment is made at ”Chargé de Cours” level. As of their appointment, members of academic staff are authorized to use the honorary title of ”Professeur”.

Contact personProf. François QUITIN (phone: 32 2 650.28.29 – e-mail: fquitin@ulb.be).

For the full description click HERE.

New PhD position at University of York -Department of Electronic Engineering

New PhD position at University of York: Machine learning and advance signal processing for intelligent spectrum and resource management in wireless networks  

Department of Electronic Engineering

 

About the Project

Efficient use of resources has always been an important issue in wireless networks. Energy, computational power and spectrum are examples of these resources. Emergence and popularity of new technologies like autonomous and connected driving, connected robotics and industry 4.0, and different sorts of digital realities (AR/VR/MR) put more demand on wireless and mobile networks. Satisfying the new coverage, capacity, latency and reliability of the networks cannot be done with conventional resource allocation/management methods. Therefore, we will investigate the machine learning and advance signal processing approaches. The project will be aligned with considered features in 3GPP release 16 and 17. The successful candidate will investigate the effects of different learning and signal processing approaches on performance of networks with different objectives and primary applications.

Entry requirements

Candidates must have (or expect to obtain) a minimum of a UK upper second class honours degree (2.1) or equivalent in Electronic and Electrical Engineering, Physics, Computer Science, Mathematics or a related subject.

How to apply

Applicants must apply via the University’s online application system at https://www.york.ac.uk/study/postgraduate-research/apply/. Please read the application guidance first so that you understand the various steps in the application process. To apply, please select the PhD in Electronic Engineering for January 2021 entry. Please specify in your PhD application that you would like to be considered for this studentship.
Applications for this studentship will be considered on a first-come, first-served basis and the position will be filled as soon as a suitable applicant is identified.

Funding Notes

This studentship will cover the tuition fee at the home/EU rate (£4,407 in 2020/21) and a stipend at the standard research council rate for a period of up to 3.5 years (£15,285 in 2020/21). International (non-EU) candidates are also welcome to apply but will be required to pay the difference between the UK/EU and international tuition fee rates (approximately £17,000 per year for the duration of the programme).
Applications for this studentship will be considered on a first-come, first-served basis and the position will be filled as soon as a suitable applicant is identified.

RequirementsUK upper second class honours degree (2.1) or equivalent in Electronic and Electrical Engineering, Physics, Computer Science, Mathematics or a related subject.

Duration 3-5 years

Remuneration approx. 17000  Pounds/Month 

Contact personDoctor Hamed Ahmadi (email:hamed.ahmadi@ucd.ie)

For the full description click HERE.

New PhD position at TU Vienna – Institute for Solid State Electronics

New PhD position at TU Vienna: Experimental and simulation analysis of electrostatic discharge protection devices in advanced high-speed technologies 

Institute for Solid State Electronics

 

Introduction

 During the manufacturing or operation of an integrated circuit (IC), the electronic devices are exposed to different kind of disturbing electrical pulses including electrostatic discharges (ESD). In high-speed applications, e.g. USB 3, the protection devices need to exhibit a low capacitance which contradicts the requirement for high ESD robustness [1]. These devices operate in breakdown regime and at extreme high current densities where the current-voltage characteristics is bistable which leads to variety of complex phenomena as current filamentation or inter-device coupling [2,3]. 

Topic

The subject of this PhD thesis is the experimental and simulation analysis of the advanced high-speed Si discrete technology ESD protection devices. The PhD candidate will combine electrical and optical techniques to analyze breakdown phenomena, self-heating effects and the current density distribution in the ESD protection devices during the ESD pulses. The unique transient interferometric mapping technique will be employed to measure thermal and free-carrier response with ns time and μm space resolution (Fig.1). The obtained experimental data will be correlated to the results of TCAD simulation (Fig.2). The goal is to understand the device physics, in particular how the current distribution inside the device determines the electrical response (e.g. voltage overshoot) and ESD robustness. 

[1] G. Notermans et al, IEEE T-DMR 19(2019)583; [2] C. Fleury et al. Microel. Reliab 76-77 (2017) 689; [3] H. Karaca et al. Proc. EOS/ESD Symposium 2019, Riverside, USA. 

Hard facts

 The topic is suited both for electrical engineers and physicists with the interest in semiconductor device physics and characterization, modeling and modern electronics. The work will be performed in the frame of a project contract with NEXPERIA Hamburg. It will contribute to the development of new ESD protection concepts and simulation methodologies. The work will be published in scientific journals and conferences. There is a prospect of permanent employment at Nexperia Hamburg. 

Requirements – Basic knowledge of semiconductor device physics, English, completed master study 

Duration 3 years 

Start  autumn 2020 

Remuneration approx. 2071 Euro Brutto/Month 

Contact person – Associate Professor Dr. Dionyz Pogany (https://fke.tuwien.ac.at) 

The application and CV should be sent by email to: dionyz.pogany@tuwien.ac.at 

For the full description click HERE.

23rd Intl. Symposium on Wireless Personal Multimedia Communications

The 23rd International Symposium on Wireless Personal Multimedia Communications

Virtual Edition October 18-21, 2020

The theme of this year’s conference is “Bridging wireless and business worlds”. This event is co-hosted by Okayama University, National Institute of Information and Communication Technology (NICT), Yokosuka Research Park (YRP), and CTIF Global Capsule (CGC).

The WPMC symposium was inaugurated in 1998, as a global platform which aims at enabling academia-industry-government collaboration in the field of wireless information. The WPMC has established itself as a unique global annual international symposium on wireless techno-business world. It encapsulates the high-end wireless technology and the current market and trends to create future businesses and innovative societies.

Continuing the series, the 23rd WPMC (https://wpmc2020.wpmc-home.com ) will bring together academia, government, business sectors and standardization bodies to explore activities, trends and future challenges towards innovative societies by bridging wireless and business worlds.

Main Topics of interest include, but are not limited to:

Wireless Communication Systems

  • Advanced modulation schemes
  • Cooperative communications
  • Massive MIMO channel models
  • Smart/ Reconfigurable antennas
  • Ultra wideband, mm-Wave and THz communications
  • Visible Light Communications
  • Local 5G Systems
  • Beyond 5G and 6G Vision & Systems Wireless Networks
  • Ad-hoc networks
  • Cross-layer design
  • Interference management
  • IoT and M2M communications
  • Localization for wireless networks
  • Multimedia QoS, traffic management
  • Spectrum sharing/coexistence
  • Vehicular networks

Security and Privacy in Communications

  • PHY-layer Security
  • Communication privacy and anonymity
  • Network intrusion detection and prevention, firewalls, packet filters
  • Malware, botnets and distributed denial of service
  • Public key infrastructures, key management, credential management

Multi Business Modeling in wireless worlds

  • Big data and data mining
  • Vertical and Horizontal 5G Business Model Ecosystems
  • Leadership and management in 5G network based Multi Business Modeling
  • 5G slicing in a world of Multi Business Modeling
  • 5G Multi Business Modeling for Non- Conventional Approaches

A proposal for Special Sessions can be submitted to the special session chair before the deadlines. The session topics can be varied upon one’s interest but  still  relate to the technical tracks.

Important Notice!

The submitted regular papers will be reviewed by a normal review process and accepted papers will be published in IEEE Xplore.

IMPORTANT DATES

Full Papers Submission: June 30, 2020 – http://edas.info/N27428
Special Session Proposal: August 1, 2020
Acceptance Notification: August 16, 2020
Final Manuscript Deadline: September 1, 2020

WEB site: https://wpmc2020.wpmc-home.com

Honorary Chair: Hirofumi MAKINO Okayama University

General Chair: Hideyuki TOKUDA, National Institute of Information and Communications Technology

Technical Program Co-Chairs:
Satoshi   DENNO, Okayama  University
Yukitoshi SANADA, Keio University (Asia Pacific Region)
Pavlos LAZARIDI, University of Huddersfield, UK (Europe Region)
Stavros KALAFATIS, Texas A&M University, USA (America Region

Financial Chair: Tetsuya YASUI, YRP R&D  Promotion  Committee

Publication Chair: Kiyoshi HAMAGUCHI, National Institute of Information and Communications Technology

Conference Operation Chair: Kazuhiro UEHARA Okayama  University

General Secretary: Yasuhiro KOYAMA, National Institute of Information and Communications Technology

AdHoc-Now 2020 – Call for Papers

19th International Conference on Ad Hoc Networks and Wireless (AdHoc-Now 2020)

Bari, Italy | 19-21 October 2020

 

AdHoc-Now has become a well-known and well-established event dedicated to wireless and mobile computing. It aims to bring together Information and Communication Technologies (ICT) experts from research institutions, academia, and industry, as well as start-ups and investors. The event also serves as a forum for interesting discussions on ongoing research and novel contributions in the context of wireless and mobile computing.

The AdHoc-Now 2020 organization team seeks original contributions as work in progress, experimental, and theoretical research in wireless, sensor, ad‐hoc, mobile, and satellite communication systems. Among the selected topics, there will be three special tracks:

– Smart Mobility
– Internet of Medical Things
– Wireless & Softwarization

For all the topics and tracks, authors are invited to submit Full-length Research Papers, short Work-in-Progress Papers, or Demo Papers.

Important updates

Due to Covid-19 outbreak, we are extending the deadline of the conference by one month. We would like to inform all contributors that, in case the outbreak will not be recovered in time, the conference will run in online mode.

Important dates of AdHoc-Now 2020

Abstract Registration: 5 June 2020
Full Paper Submission Due: 14 June 2020
Notification to the Authors: 1 August 2020
Authors registration and camera-ready: 1 September 2020
End of early bird rates: 1 October 2020
AdHoc-Now Conference 2020: 19-21 October 2020

Author instructions

Submissions must not be published or under review for any other conference or journal. All manuscripts must be in English. Full-length Research Papers should be 12 pages (single column), short Work-in-Progress Papers should be 6 pages (single column), and Demo Papers should be 6 pages (single column), all based on templates provided by Springer.
Papers can be submitted through the Springer OCS system in pdf form.
Please, follow the submission link: https://ocs.springer.com/ocs/home/AdHocNow2020

Organised BY: Politecnico di Bari
Supported by: CNIT
Contacts: www.adhocnow2020.it , adhocnow2020@poliba.it

 

For more information on the special tracks and on the other topics of interest, please refer to the CONFERENCE BROCHURE.

PhD on Electro-Magnetics Fields and 5G, University of Lille (IEMN-IRCICA Lab)

PhD on Electro-Magnetics Fields and 5G
University of Lille (IEMN-IRCICA Lab)

L. Clavier (IMT Lille Douai), D. Gaillot (Univ. Lille)
J. Wiart (T´el´ecom Paris)

I. SUMMARY OF THE PHD
With the increasing use of wireless communication facilities [1], we live in a permanent electromagnetic field (EMF) that has induced concern and risk perception despite existing regulation. The people in charge of networks deployment, the ones who check the compliance of EMF exposure to safety limits are facing such questions [2]. The assessment of exposure requires specific equipment or simulation tools that can be complex to operate, contributing therefore to increase the gap between lay people and experts. The 5G deployment, that is just starting, reinforce these issues [3, 4] bringing new uncertainties resulting from the ever increasing band used and the beamforming induced by massive MIMO. This PhD will address these questions, several locks remaining to be overcome.

The objective is to be able to built an EMF exposure map. Today the EMF monitoring is carried out using measurement campaigns, These in situ measurements are of great interest but they cannot be performed everywhere. Taking advantage of progress in connected devices technologies, the exposure assessment has been investigated using connected sensors. Recently, wireless sensors, autonomous in energy, have been designed, and proposed. Associated in networks, these sensors are of great interest since they can grab the exposure’s temporal variations; nevertheless, since they are still localized they cannot, alone, provide an exposure mapping because of unsampled locations. Reconstruction using measurements localized in some specific places has been investigated using methods based on geostatistic and Gaussian processes [5, 6, 7]. Recently works have been carried out using Artificial Intelligence and machine learning [8, 9]. These works have been performed using simulations taking into account information that are available through databases (like the position of the base stations) as well as drive testing. Since these works dealt with simulations, confrontation with measures will require an adaptation of the method to increase the accuracy and take into account specific properties of the EM field. Many improvements can be studied. The first one is to include some data from the field, like the city density, the position of the base station, or any other significant parameters, which are publicly available. It is also possible to manage sensors of different qualities and to include mobile sensors to improve the reliability of the reconstruction. Taking into account the density of the sensors, the imprecision of the location and the measurement and the temporal evolution of the EM field also constitute research challenges.

II. ORGANISATION OF THE WORK
The work is based on data that will be measured in different locations in Lille. A large number of sensors ( 50) will allow to cover an area in the city center and another set of sensors will cover another place. The objective of the work is to develop a machine learning process to analyze the data and reconstruct in space and time the electro-magnetic field. This will allow to evaluate the exposure of a given person in the city.

III. REQUIRED SKILLS
Telecommunication, 5G. Part of the PhD is devoted to data processing and, possibly, measurement campaigns. Knowledge of Telecommunications is important and experimental abilities would be appreciated.
Machine learning
Python, Anaconda, Tensorflow

IV. TO APPLY
For further information or to apply, contact and send a CV to JoeWiart (joe.wiart@telecom-paris.fr), Davy Gaillot (davy.gaillot@univlille.fr) and Laurent Clavier (laurent.clavier@imt-lille-douai.fr).

REFERENCES
[1] L. Clavier, T. Pedersen, I. Rodriguez, M. Lauridsen, and M. Egan. Experimental Evidence for Heavy Tailed Interference in the IoT. working paper or preprint; https://hal.archives-ouvertes.fr/hal-02521928/file/ExpWCL 4p.pdf, March 2020.
[2] Joe Wiart. Radio-Frequency Human Exposure Assessment: From Deterministic to Stochastic Methods. 01 2016.
[3] Miroslava Karaboytcheva. Effects of 5g wireless communication on human health. Briefing PE 646.172, EPRS – European Parliamentary Research Service, March 2020.
[4] M. Egan, L. Clavier, M. de Freitas, L. Dorville, J. Gorce, and A. Savard. Wireless communication in dynamic interference.
[5] Sam Aerts, D. Deschrijver, L. Verloock, T. Dhaene, Luc Martens, and Wout Joseph. Assessment of outdoor rf-emf exposure through hotspot localization using kriging-based sequential sampling. Environmental research, 2013.
[6] A. Solin, M. Kok, N. Wahlstr¨om, T. B. Sch¨on, and S. S¨arkk¨a. Modeling and interpolation of the ambient magnetic field by gaussian processes. IEEE Transactions on Robotics, 34(4):1112–1127, 2018.
[7] Thomas Lemaire, Joe Wiart, and Philippe Doncker. Variographic analysis of public exposure to electromagnetic radiation due to cellular base stations: Variographic analysis of bts emf exposure. Bioelectromagnetics, 37, 10 2016.
[8] Sam Aerts, Joe Wiart, Luc Martens, and Wout Joseph. Assessment of long-term spatio-temporal radiofrequency electromagnetic field exposure. Environmental research, 161:136–143, 11 2017.
[9] S. Wang and J. Wiart. Sensor aided emf exposure assessments in urban environment using artificial neural networks. Int. Journal Environmental research and public health, 2020.In GLOBECOM 2017 – 2017 IEEE Global Communications Conference, pages 1–6, 2017.

Assistant / Associate Professor positions @ IMT Lille Douai (North of France)

Assistant / Associate Professor positions @ IMT Lille Douai (North of France)

 

IMT Lille Douai (North of France) is looking for 4 assistant/associate Professor permanent positions in the following themes:

  1. Telecommunications, signal processing, massive machine type communication, Ultra Reliable Low Latency Communication, NOMA, IoT.
  2. Modeling, estimation, control and monitoring of systems.
  3. Artificial intelligence, multi-agent systems, machine learning, optimization.
  4. Data science, machine learning, deep learning.

For the full details, send an email to: laurent.clavier@imt-lille-douai.fr

Deadline for applications: 04/30/2020

Conditions for the eligibility of applications: European nationality (European Union) effective on the date of the first test and holder of a PhD.

Special Issue “Human Exposure in 5G and 6G Scenarios”

Special Issue “Human Exposure in 5G and 6G Scenarios”

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section “Electrical, Electronics and Communications Engineering“.

Deadline for manuscript submissions: 31 July 2020

For more details: https://www.mdpi.com/journal/applsci/special_issues/5g_6g_scenarios

 

Special Issue Information

The upcoming development of the 5th generation mobile networks (5G) based on wireless communications will involve for the first time a wide use of the millimeter-wave spectrum (30–300 GHz). The need for new network performances, such as low transmission latency and an increase in data rates, will also involve the introduction of technological innovations, such as ‘massive’ MIMO antennas and beamforming. Furthermore, small cells will be integrated into 5G networks. All these novel usages will lead to a new world of connectivity, which will develop the concept of future smart cities, factories, and roads and will improve the user benefits, providing ubiquitous wireless access to the cloud. These heterogeneous networks will also drastically modify user exposure.

In this Special Issue, we invite submissions dealing with the human exposure assessment in the upcoming 5G exposure scenario and beyond 5G technologies (e.g., in the THz band). Research papers or reviews can focus on (but are not limited to) measurements and/or simulation methodologies for 5G and beyond 5G technologies, deterministic and statistical approaches, in situ exposure assessment, concepts for minimizing exposure, network optimizations, etc.

Dr. Marta Parazzini
Prof. Dr. Wout Joseph
Dr. Maxim Zhadobov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI’s English editing service prior to publication or during author revisions.

Keywords

  • 5G and 6G technologies
  • human exposure assessment
  • measurements
  • simulations
  • real-life scenarios
  • in-situ exposure assessment
  • massive MiMO
  • distributed massive MIMO
  • 5G NR
  • beamforming
  • 5G network optimization and exposure minimization

Published Papers

This special issue is now open for submission.

Junior Professorship at TU Ilmenau, with tenure track “Radio Technologies for Automated and Connected Vehicles”

Junior Professorship (W1) with tenure track
“Radio Technologies for Automated and Connected Vehicles”

 

TU Ilmenau is looking for a Junior Professor on the topic “Radio technologies for automated and connected vehicles”.

The professorship has a tenure track, i.e., after 6 years and positive evaluation, it will be converted into a permanent W3 position.

The deadline is March 15th

For more information please follow these links:

English text
https://jobundkarriere.tu-ilmenau.de/jobposting/d9bbdf07d3c25fed399ebe29e65963a4d81815dc

Deutscher Text
https://jobundkarriere.tu-ilmenau.de/jobposting/5eb7b1e809924cf032d055471009f837ec5de75f