הפקולטה להנדסה ע"ש איבי ואלדר פליישמן

EE Seminar: The devil is in the details: on the real costs and benefits of WOM codes for Flash

(The talk will be given in English)

Speaker: Dr. Gala Vadgar
CS, Technion

Monday, November 14^th, 2016
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

The devil is in the details: on the real costs and benefits of WOM codes for Flash

Abstract

NAND flash, used in modern SSDs, is a write-once medium, where each memory cell must be erased prior to writing. The lifetime of an SSD is limited by the number of erasures allowed on each cell. Thus, minimizing erasures is a key objective in SSD design.
A promising approach to eliminate erasures and extend SSD lifetime is to use write-once memory (WOM) codes, designed to accommodate additional writes on write-once media. However, these codes inflate the physically stored data by at least 29%, require an extra read operation before each additional write, and their applicability to MLC and TLC flash is restricted.
I will describe the first evaluation of the possible benefit from reusing flash pages with WOM codes on real flash chips and an end-to-end FTL design and implementation. Our results expose a considerable gap between the theoretical benefits of page reuse and those that can be achieved on current state-of-the-art hardware. However, they also lay the ground for promising future improvements.
Joint work with Fabio Margaglia, Eitan Yaakobi, Yue Li, Assaf Schuster and Andre Brinkmann.

Bio

Gala Yadgar is a senior researcher in the Computer Science Department at the Technion, where she received her Ph.D in 2012. She is an associate editor of ACM Transactions on Storage, and serves on the program committees of SYSTOR, MSST, and FAST. Her research is directed at methods for improving performance and reliability of storage in large scale data centers, focusing on complex hierarchies and enhanced storage interfaces.‏

14 בנובמבר 2016, 15:00

חדר 011, בניין כיתות חשמל

EE Seminar: From pde's towards networks: a port Hamiltonian approach to distributed parameter systems

(The talk will be given in English)

Speaker: Prof. Maschke Bernhard
Systems & Control Eng., University Claude Bernard, Lyon, France

SUNDAY, November 13^th, 2016
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

From pde's towards networks: a port Hamiltonian approach to distributed parameter systems

Abstract

In this talk, we shall illustrate on diﬀerent examples, how the Port Hamiltonian formulation relates systems of PDE’s with energy-conjugated interface variables, to an abstract network representation. In a ﬁrst part, we shall ﬁrst recalls the deﬁnition of Port Hamiltonian systems deﬁned on Stokes-Dirac structures and their derivation from Hamiltonian systems of conservation laws. In the second part we shall deﬁne some basic network components and give a network representation of the Port Hamiltonian systems. in the third part we shall discuss on some examples alternative Hamiltonian representations associated with 1-dimensional ﬂuid models.

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13 בנובמבר 2016, 15:00

חדר 011, בניין כיתות-חשמל

הנדסה ביו רפואית - הרצאת אורח

פרופ' יעל חנין

13 בנובמבר 2016, 15:00

Temporary-tattoo for long-term high fidelity bio-potential recordings

Prof. Yael Hanein

School of Electrical Engineering, Tel Aviv University, Israel

Surface electromyography (sEMG) is a non-invasive method widely used to map muscle activation. For decades, it was commonly accepted that dry metallic electrodes establish poor electrode-skin contact, making them impractical for skin electromyography applications. Gelled electrodes are therefore the standard in sEMG with their use confined, almost entirely, to laboratory settings. Very recently we developed novel dry electrodes, exhibiting outstanding sEMG recording along with excellent user comfort. The electrodes (electronic tattoos) are realized using screen-printing of carbon and silver inks on a soft support. The conformity of the electrodes helps establish direct contact with the skin, making the use of a gel superfluous. The suitability of the electrodes for long-term and stable sEMG from different muscles was demonstrated and emphasizes the potential of the technology for many applications, such as brain-machine interfacing, muscle diagnostics, post-injury rehabilitation, and gaming.

ההרצאה תתקיים ביום ראשון 13.11.16, בשעה 15:00

בחדר 315, הבניין הרב תחומי, אוניברסיטת תל אביב

ה ביו רפואית

seminar 13.11.16

13 בנובמבר 2016, 14:30

גיל תמיר

תלמיד המחלקה להנדסה ביו רפואית לתואר שני ירצה בנושא:

3D TEMPERATURE MAPPING FOR MONITORING OF TUMOR'S LOCALIZED HYPERTHERMIA TREATMENT

Tumor treatment procedures span from electron radiation to chemotherapy and surgery. These procedures differ in many aspects involving invasiveness, collateral damage, effectiveness duration, ext. Hyperthermia therapy is a treatment in which the cancerous tissue is exposed to high temperatures to damage and kill cancer cells. A well established localized hyperthermia treatment procedure was proposed by Gannot et.al via the use of Antibody conjugated magnetic Nanoparticles which hold the ability to specifically adhere tumors. Once subjected to an external RF-frequency magnetic field the tumor conjugated MNPs form a localized heat source.

In our current work we present a heat source temperature monitoring method to ensure hyperthermia effectiveness and minimize collateral damage to surrounding tissues.

The temperature monitoring method is based on a heat source (tumor) power estimation algorithm.

A byproduct of the localized hyperthermia is the tissue heat conduction from the embedded tumor (source) to tissue/body physical boundary i.e. skin surface.

Hence while exposing the tissue to external magnetic field, a time dependent temperature pattern/hot spot is captured by a thermal camera facing the skin. Given the geometrical dimensions of the ROI and tissue, ambient thermal properties the ill-posed thermal inverse problem is solve.

We show that thermal XY resolution (per depth) improves as stimulation frequency increases even slightly above DC, enabling better heat source XY separation and margin identification in the case of distributed heat sources.

העבודה נעשתה בהנחיית פרופ' ישראל גנות המחלקה להנדסה ביו-רפואית, אוניברסיטת תל-אביב

EE Seminar: Applications of Subspace and Low-Rank Methods for Dynamic and Multi-Contrast Magnetic Resonance Imaging

(The talk will be given in English)

Speaker: Prof. Michael Lustig
EE & CS, University of California, Berkeley

mlustig@eecs.berkeley.edu

Monday, November 28^th, 2016
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

Applications of Subspace and Low-Rank Methods for Dynamic and Multi-Contrast Magnetic Resonance Imaging

Abstract

There has been much work in recent years to develop methods for recovering signals from insufficient data. One very successful direction of developments are subspace methods that constrain data to live in a lower dimensional space. These approaches are motivated by theoretical results in recovering incomplete low-rank matrices as well as exploiting the natural redundancy of multidimensional signals. In this talk I will present our research group’s contributions in this area. I will start with describing a new decomposition that can represent dynamic images as a sum of multi-scale low-rank matrices, which can very efficiently capture spatial and temporal correlations in multiple scales and dimensions. I will then describe and show results from applications using subspace and low-rank methods for highly accelerated multi-contrast Magnetic Resonance Imaging (MRI) and for the purpose of motion correction in MRI.

28 בנובמבר 2016, 15:00

חדר 011, בניין כיתות-חשמל