Category Archives: Education

More on ethics and good scholarly behavior

Today I learnt that the junior author of the manuscript submitted to my journal, of which I reported in the blog below, had sent in the cover letter on the senior co-author’s behalf, without the senior co-author knowing it. If true — the whole situation becomes quite confusing and blurred, I feel — then the senior author is not to blame for the whole situation but his junior co-author.

Soon thereafter, I indeed received an apology letter from the junior author, basically begging for forgiveness and asking to withdraw the manuscript submitted on her behalf. In my imagination I am picturing the senior co-author, who must be the supervisor of this young, inexperienced, junior co-author, with a whip in his hand and an angry expression under his eyebrows and the young author bursting out in tears and trying to see the screen clearly while typing that email message to me. Not an easy thing to decide on (to withdraw or not).

I am still mulling it over.

Wouter

About ethics and good scholarly behavior

Today I wrote the following email letter to an author who just submitted a manuscript and an accompanying cover letter to "my" journal: 

Dear [Author’s Name],

I noticed in your cover letter the three names you suggested as prospective reviewers for your manuscript submitted to [My Journal]. A quick investigation reveals that these three people have all served as co-authors on prior publications co-authored by you and thus have a conflict of interest if they accept the review of your manuscript submitted to [My Journal].

I believe suggesting reviewers that have a conflict of interest cannot be considered good scholarly behavior and is even unethical. I have been lining towards rejecting your manuscript immediately, however this would harm the career of your current co-author, [Name Co-Author], which is not my intention.

From your cover letter I can also read that you are currently an associate editor for [His Journal]. I must admit that this worries me, as members of the editorial boards of highly reputed journals that use peer review should be members in good standing and thus refrain from creating and/or benefitting from conflicts of interest. I am pretty sure the Editor-in-Chief of [His Journal], [Name EiC], will agree with me.

In the interest of your co-author I will proceed with the review process of your manuscript. However, I hope you can assure me that this will never happen again.

I expect an acknowledgement of receipt of this message and, if possible, an explanation and/or reassurance.

Sincerely,

Wouter A. Serdijn, PhD, F-IEEE
Editor-in-Chief
IEEE Transactions on Circuits and Systems-I: Regular Papers"

Hot Wavelets

The paper "Emerging Applications of Wavelet: a review", by Akansu, Serdijn and Selesnick has been declared the hottest (No. 1) paper in Computer Science, Physical Communication (Elsevier) over the period from October 2009 to September 2010. Over the past 9 months, the paper held its No. 1 position firmly, so it is thus heading for becoming the hottest paper for two consecutive years!

A first proof-of-principle of a Tinnitus detector circuit

Tinnitus is a condition in which a patient perceives an auditory phantom sound that can take the form of ringing, buzzing, roaring or hissing in the absence of an external sound. Approximately a billion of people suffer from tinnitus worldwide, while in 2% – 3% of the population, tinnitus significantly degrades quality of life of the patients and can lead to insomnia, anxiety and depression.

Currently, there are no proven treatments for tinnitus. However, recent research has shown that tinnitus patients can benefit from electrical brain stimulation. In addition, it has been shown that there is a link between tinnitus perception and a change in the energy levels of several electrocortigography (ECoG) / electroencephalography (EEG) frequency bands. For example, the energies of theta (4-8Hz) and low-gamma (30-50Hz) waves increase, while the energy of alpha (8-12Hz) waves decreases during active tinnitus perception. The same studies suggest that the intensity of the tinnitus perception correlates with the amount of the energy increased in the gamma band.

The real-time tinnitus detection method proposed by the BME group detects tinnitus by comparing ECoG/EEG signal energies from different locations in the brain according to a tinnitus "signature". First, the proposed strategy selects appropriate ECoG/EEG bands per channel by means of band-pass filters. Next, their extracted energies are compared to their counterparts from a different (healthy) location. Tinnitus is detected only if higher theta and gamma energies while lower alpha energy is found when compared to the signals from this healthy region. The applicability of the detector is verified by means of circuit simulations with real neural waveforms and is able to successfully detect tinnitus.

Are you interested in any progress related to the tinnitus detector circuit? Stay tuned.

Senad 

Unexpected Meet and Greet with Hero in Circuit Theory

Georg Simon OhmLast week, I was in Köln, Koeln, Keulen or Cologne (depending on from which country you are) with my family and while on our way to the Dom, Cologne’s well-known cathedral, I bumped into one of the greatest heroes of electric circuit theory: Georg Simon Ohm. The sign says that "George Simon Ohm discovered, in this house, being a teacher at the Old Gymnasium in Cologne, in 1826, the foundation of electric current."

Though one of the most important discoveries indeed, I think it is not so much the discovery of the foundation of electric current, but rather the relation between voltage and current that holds for linear resistances (and impedances, in the harmonic regime), later known as "Ohm’s Law" that caused his name to be remembered forever.

For those that have both an interest in technology and law, I cordially recommend Ohm’s Law and Kirchhoff’s Laws as basic study material.

Wouter

Can I ask a question?

There was a very interesting lecture from dr. Firat Yazicioglu yesterday. This lecture, entitled Analog Signal Processing for Bio-Medical Applications, was at IMEC Belgium in Leuven. However, Biomedical Group members attended the lecture online, using streaming technology. The lecture was real-time projected in the Davidsezaal at the 18th floor of our building at Delft University of Technology (TU Delft). As I really enjoyed the lecture, I would like to share a few main points with you.

Dr. Yazicioglu introduced the lecture by explaining what main drivers are behind emerging biomedical electronics. One of the most important drivers is that healthcare costs can be reduced by remote monitoring of the patients. Other important drivers are the need for tools for emerging therapies, need for smart (closed-loop) devices that can adapt their therapy to the patient’s condition, understanding of biology and brain communications and Brain Computer Interfaces (BCI) for, i.e., the gaming industry.   

The speaker continued the lecture with topics about instrumentation amplifiers, impedance measurements and biomedical signal processing.  

One of the main messages of instrumentation amplifiers part is that implantable and wearable biomedical devices tighten the specifications of traditional instrumentations amplifiers where an optimum between noise and power consumption has to be found. In the biomedical electronics field, instrumentation amplifier specifications are much tougher and an optimum among noise, supply voltage, # of extern components, CMRR, input impedance and DC filtering range needs to be found.

Other types of electronic circuits treated by the speaker were circuits for impedance measurements. Such measurements can be useful in electrode quality check, motion artifact monitoring, medical imaging, respiration monitoring and impedance cardiography. 

Last part of the lecture was about biomedical signal processing. In biomedical signal processing, very often, there is a need for high count channel measurements. Employing traditional signal processing schemes it is impossible to keep biomedical devices power efficient. However, by combining Analog Signal Processing (ASP) and Digital Signal Processing (DSP), more power efficient medical devices can be developed. Important massage here was that in the case of careful design the total power consumption of the system can be less than the sum of the power consumptions of all separate blocks,
Psystem << Panalog+Pdigital+Pradio.
I would like to end this post by thanking dr. Firat Yazicioglu for a very interesting and useful lecture.

Thoughts over an exam…

Besides many research related posts on this weblog, there is another important aspect in universities: education. Currently the spring examinations take place. It is time to see if our efforts in introducing the students into the exciting world of transistors were good enough. Today I was supervising a retake of a first year BSc-course. In order not to get too bored, I printed out a bunch of papers to read through…

Despite the reading material, I was preparing for a long morning. But nothing could be further from the truth! While the students were sweating and battling their way through the exam, I picked up a paper about the history of electrical stimulation [1]. It was discussing about the very first steps of electricity for medical applications. As it turns out, soon after the development of the first electrical devices in the second half of the 18th century (such as static electricity machines, the Leyden jar or later the volta-cell), these devices were put in use for medical research very soon. Just like myself today, people were fascinated by how our body responds to electricity.

It is incredible to read what achievements were made with the extremely limited equipment that was available. Even more incredible were the experiments that were carried out: the effect of electricity on the human body was demonstrated using the decaptivated heads of executed criminals! Furthermore the functionality of pacemakers was demontrated by over-anesthesthetized animals until cardiac arrest occured, to subsequently reanimate them using electrical stimulation. Remarkably the method was also applied to a human subject, but without success…

Besides experiments, the inguinity of researchers to build machines is very remarkable. Without the availability of vacuum tubes (let alone transistors), it is hard to make pulses with accurate duration in the order to hundred milliseconds (which are required for stimulation). Various mechanical systems are described, of which the most remarkable one is a system in which a gun is fired to cut two wires placed at a certain distance from each other. Only during the time the bullet is travelling from the first wire to the second, the system is injecting electrical energy into the tissue. Imagine how being a researcher was like in those days: shooting rifles the whole day! Quite a difference from running circuit simulations like we do today!

For more interesting stories I can highly recommend to read this paper. Or save it for when you have to supervise an exam. For now: time to check the exam!

Marijn

[1] Geddes, L.A., "The first stimulators-reviewing the history of electrical stimulation and the devices crucial to its development", Engineering in Medicine and Biology Magazine, IEEE , vol.13, no.4, pp.532-542, Aug/Sep 1994

BioCAS 2013 in Delft or Amsterdam?

Looking back on a successful BioCAS 2010 in Cyprus, the BioCAS Steering Committee is gradually looking forward to bids to host BioCAS 2013. Looking at the activities in the Netherlands by companies, such as Medtronic, Philips Healthcare, Twente Medical Systems, a.o., and academia in the Medical Delta, viz. Erasmus University Rotterdam, Leiden University and Delft University of Technology, the recent Dutch Innovative Medical Devices Initiatives and of course our own activities in the field of Biomedical Electronics, I think hosting BioCAS 2013 in Delft or Amsterdam would be great! I am currently ramping up the first discussions on this with prospective members of my organizing team.

One thing that we, unfortunately, cannot beat is the very fine weather we encountered at Cyprus. See the picture below of Cees-Jeroen, Mark, Marijn and Wannaya enjoying lunch at BioCAS 2010 in the bright sun. On the other hand, the Netherlands have lots of other good stuff to offer and usually the weather isn’t too bad in November. So stay tuned, to hear more about whether and how these plans come to fruition.

BioCAS 2010

Wouter

The pressure to publish creates many victims a day

Today’s headlines of Science report that a former researcher at the renowned Massachusetts Institute of Technology has been convicted of fraud for fabricating and falsifying data. Recently a well-respected German politician copied about 50% of his PhD thesis without giving proper credits to the author(s) of the original work. He had to return his degree and resigned from the government.

plagiarism

As Editor-in-Chief of IEEE’s Transactions on Circuits and Systems-I, I receive every month a socalled "Prohibited Authors List", indicating authors that have been found guilty of plagiarism or other improper scholarly behavior and that are no longer allowed to publish in one or more IEEE journals. Unfortunately, this list is growing every month.

So, what is driving these scientists to commit fraud or plagiarism? In many cases I believe it is career pressure, as received from employers, peers, colleagues, funding agencies, or even from the researchers themselves. Of course, every scientist is responsible for his own deeds. However, the fact that the pressure may also be coming from outside means that others or other bodies can become partner in crime, too.

First of all, there is the supervisor of young PhD students, who, busy as they may be, force their young pupils to submit manuscripts to journals and conferences and inform them that the degree can only be awarded if they have at least two publications in an internationally recognized journal. There are quite a few universities that even require MSc students to have an IEEE publication before they can graduate for their MSc studies.

Second, there are the employers of (academic) staff members, who, busy as they may be, no longer seem to have the time or no longer spend enough time to properly evaluate the quality of the work conducted and thus offload their responsibility of evakuating to a number of anonymous reviewers who may or may not recommend the work be published. Often it is the number of publications that count more than their real impact.

Third, there are the funding agencies. I have evaluated a lot of project proposals over the past couple of years and one aspect to grade the applicants on is their past performance and reputation. If I have been working in the field myself, then this is a piece of cake, as I know the impact of the work conducted by my peers, at least to a certain extent. However, if you are a member of a jury that decides on, e.g., 20 project proposals of which maybe only one or two are in your field of expertise, then what do you do? I bet most people then resort to counting the number projects and publications with incomprehensible names and titles.

At Delft University of Technology, for a long time a large portion of the amount of funding professors, section heads, department heads and deans would receive from the university’s "1st money stream" depended on, indeed, the number of publications, the number of pages published and the (sometimes perceived) impact factor of the journal. I figured that if everybody at our university would only publish 50% of what he published the previous year, nothing would affect the amount of money received per faculty, department and section and this extra time could be well spent on writing better papers, performing better research and offering better education. Or on just going home on time at the end of the day for once.

Before I sign off, I would like to address young MSc and PhD students. I very well remember a case that I got involved in as editor-in-chief, in which a young, bright, PhD student abroad committed plagiarism. The plagiarism was discovered after the publication was made and, in line with procedures prescribed by the IEEE, I installed a committee to investigate the case and to decide on which sanctions should be applied. When I confronted the young author and his co-authors, of whom two were his supervisors, with the allegation made, the supervisors closed ranks immediately and blamed the PhD student for everything that had gone wrong. Despite my correspondence with the authors and expressing my viewpoint that I held also the supervisors resonsible for what had happened, in the end, the PhD degree was never awarded and the PhD student lost his appointment. I am pretty sure the professors are still there!

So my advice to everybody that is in the process of writing his first major journal paper or conference contribution is the following: please familiarize yourself with the ethical code of conduct of your organization and the publisher. For the IEEE, this code of ethical conduct can be found in IEEE’s Code of Ethics and the IEEE PSPB Operations Manual. In case of doubt, always touch base with your supervisors and/or the editor-in-chief of the journal or technical program chair of the conference you would like to submit your manuscript to. They are there to help. I know one author that contacted me well before he submitted his manuscript. By informing him of the possible consequences of his "reuse of phrases crafted by somebody else", I could prevent him from making a serious mistake by mistake and, fortunately, he still has a bright career ahead of him.

Wouter

Today, three Masters of Science in Electrical Engineering graduating from the Biomedical Electronics Group

Today is graduation day, at least for three members of the Biomedical Electronics Group, who will be awarded the degree of "Elektrotechnisch Ingenieur", or the Master of Science degree in Electrical Engineering as it is called in English. They are Gaurav Mishra, Hossein Tajeddin and Mark Stoopman. If you read this blog on time and if you are around, please join in the official ceremony at 13:00 hrs in lecture theater Ampere of the EWI building, or join us about 90 minutes later in the Pub to congratulate the newborn ingenieurs with their well-deserved title.

Wouter