Category: Graduate Student Opportunities

2014 Best ECE Ph.D. Dissertation Award goes to Dr. Jie Meng

July 10th, 2014 in Alumni, Awards, Graduate Programs, Graduate Student Opportunities, Graduate Students, Recognition, Research, Students

By Donald Rock (COM ’17)

On May 17th, Dr. Jie Meng received a Ph.D. in Electrical Engineering and was presented with the 2014 Best ECE Ph.D. Dissertation Award. Her dissertation is entitled Modeling and Optimization of High-Performance Many-core Systems for Energy-Efficient and Reliable Computing and focuses on improving the energy efficiency of many-core processors and large-scale computing systems.

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Accomplishing this goal, as Meng’s thesis argues, requires detailed, full-system simulation tools that can simultaneously evaluate power, performance, and temperature. Her award-winning thesis includes the design of such simulation methods and leveraging these methods for the development of dynamic optimization policies for computing systems.

This prestigious award is just one of a number of awards that the ambitious engineer has received throughout her Ph.D. career. In 2012, Dr. Meng won the Best Paper Award at the High Performance Extreme Computing Conference; in 2011 she won the A. Richard Newton Graduate Scholarship Award with her advisor, Assistant Professor Ayse Coskun (ECE), at the Design Automation Conference; and in 2010 she received the Google Scholarship at the Google GRAD CS Forum. Furthermore, Dr. Meng has won a number of awards from Boston University, including the Outstanding Graduate Teaching Fellow in the School of Engineering and the 2009 ECE Graduate Teaching Fellow of the Year Award.

Professor Ayse Coskun (left) and Dr. Jie Ming (right) at the 2014 College of Engineering Ph.D. Commencement Ceremony (Photo provided by Professor Ayse Coskun).

Professor Ayse Coskun (left) and Dr. Jie Ming (right) at the 2014 College of Engineering Ph.D. Commencement Ceremony (Photo provided by Professor Ayse Coskun).

Dr. Meng started her academic career at the University of Science and Technology of China (USTC), where she earned a Bachelor of Engineering Degree in Electrical Engineering in 2004. She went on to earn a Master of Applied Science in Electrical and Computer Engineering at McMaster University before coming to Boston University in 2008 to pursue her Ph.D.

Dr. Meng simultaneously pursued career advancement while maintaining her academic workload. She landed an internship at the Intel Corporation, and another at Sandia National Laboratories.

Currently, Dr. Meng works as a software engineer at CGG, a French-based geophysical services company. “To be specific, I am working on developing software modules for modeling and imaging geological structures in the exploration [of] seismic field,” Meng clarified in an email correspondence.

When Dr. Meng reflects back on her time at BU, she remembers, “I was very lucky and grateful to have Professor Ayse Coskun as my advisor. [She was] a role model for me.” Professor Coskun felt similarly, noting, “Jie is a very hard-working researcher and she has the necessary perseverance to succeed. Seeing Jie graduate successfully as my first Ph.D. student and continue to her career has been among the most satisfying accomplishments of my time at BU.”

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College Expands Master’s Options

February 28th, 2014 in Courses, Graduate Programs, Graduate Student Opportunities, Graduate Students

By Michael G Seele

08-2055-042The College of Engineering is expanding its suite of master’s degree programs to give students more flexibility in choosing a program best suited to their career aspirations. Anticipated to be fully in place for the fall 2014 semester, these programs emphasize advanced technical coursework and include an individual or team-based practicum design project. Students will be able to choose among Master of Science and Master of Engineering programs.

“We’ve added new dimensions to our master’s degree programs that speak to the career paths of prospective graduate students,” said College of Engineering Dean Kenneth R. Lutchen. “Whether students want a strictly technical program, one that includes some leadership training or one that prepares them for doctoral work, all options will be available to them.”

All Master of Science programs emphasize advanced technical coursework and include an individual or team-based practicum design project, as well as a range of opportunities to gain practical experience, including company or research internships. MS programs are available in Computer, Electrical, Mechanical, Manufacturing, Systems and Photonics engineering. Programs in Biomedical and Materials Science & Engineering are expected to be available in the fall.

Master of Engineering programs include advanced technical coursework, as well as the option to take elective courses in Project Management and Product Design, some of which are offerred in the School of Management. The programs—offered in Biomedical, Computer, Electrical, Manufacturing, Mechanical, Systems, Photonics, and Materials Science & Engineering—also include a practicum requirement.

All programs can be completed in one or two years. The application deadline for the fall 2014 semester is March 15.

Looking Beyond the Lab

February 11th, 2014 in Awards, Courses, Events, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, Grants, News-CE, News-EP, News-ISS, Research, Research-CE, Research-EP, Research-ISS, Students

Postdoctoral associate, George Daaboul; research associate, David Freedman; and lecturer and entrepreneur, Rana Gupta (SMG) were among the Boston University participants of the NSF I-Corps program.

Postdoctoral associate, George Daaboul; research associate, David Freedman; and lecturer and entrepreneur, Rana Gupta (SMG) were among those participating from Boston University in the NSF I-Corps program.

Many engineers have great ideas for products, but unfortunately, they don’t often have a background in business that will allow them to bring their designs to market.

To help with this problem, two Boston University research teams recently participated in the National Science Foundation (NSF) Innovation Corps (I-Corps), a program that encourages scientists and engineers to broaden their focus beyond lab work through entrepreneurship training.

“We had been trying to bring some of our ideas to a commercial state when we heard about the program,” said David Freedman, a BU research associate in the Department of Electrical & Computer Engineering. “It seemed like a great fit for us.”

Freedman and postdoctoral associate, George Daaboul, had been working closely with Professor Selim Ünlü’s (ECE, BME, MSE) research group trying to determine how their technology, IRIS, used to detect viruses and pathogens, might be applied in doctors’ offices, hospitals, and emergency care centers. They soon decided that forming an I-Corps team would allow them to evaluate the commercial potential.

Teams receive $50K in grant money and consist of an Entrepreneurial Lead (Daaboul), a Principal Investigator (Freedman), and a business mentor. The researchers asked BU lecturer and entrepreneur, Rana Gupta (SMG), to take on the latter role.

Also participating from BU were Assistant Professor Douglas Densmore (ECE) and Research Assistant Professor Swapnil Bhatia (ECE). They pitched Lattice Automation, technology that will allow technology by the Cross-disciplinary Integration of Design Automation Research (CIDAR) group to transition into commercial products. Ultimately, they hope to create software that will help synthetic biologists work more efficiently.

“Our technology is building upon state-of-the-art techniques in computer science, electrical engineering, and bioengineering,” explained Densmore.

Conceptual illustration of SP-IRIS technology used for pathogen diagnostics.

Conceptual illustration of SP-IRIS technology used for pathogen diagnostics.

Over eight weeks in the fall, participants attended workshops in Atlanta, Ga., met with researchers from the 21 teams, followed an online curriculum, and spoke with up to 100 different potential consumers of their technology – a process known as “customer discovery.”

Through this experience, Freedman and Daaboul quickly learned that introducing a new technology to customers might not be the right approach for their research.

“We decided instead to focus on the pains customers had with existing technologies and hone in on how we could alleviate those,” said Freedman.

Added Daaboul: “Finding out what people really needed before developing a technology really allowed for a much different perspective than what I’m used to.”

Much of the knowledge gained through I-Corps will be used to advance science and engineering research. Some products tested during the workshops even show immediate market potential by the conclusion of the curriculum.

“I would recommend this program to anyone working in science or industry,” said Freedman. “Not only did this change how we think about our research, we also learned how to better tell our narrative.”

-Rachel Harrington (rachelah@bu.edu)

A Google for Surveillance Videos

January 22nd, 2014 in Awards, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, Grants, News-ISS, Recognition, Research, Research-ISS, Students

Professor Venkatesh Saligrama (ECE, SE) and his research team address the problem of retrieving video segments which contain user-defined events of interest, with a focus on detecting objects moving in routes.

Professor Venkatesh Saligrama (ECE, SE) and his research team address the problem of retrieving video segments, which contain user-defined events of interest, by focusing on detecting objects moving in routes.

After the Boston Marathon bombings last year, it took authorities just three days to sift through an abundance of footage and find their suspects – light speed compared to the weeks it took to find those responsible for the London bombings in 2005.

Still, can this happen faster? Professor Venkatesh Saligrama (ECE, SE) thinks so, and he’s working to making that vision a reality.

The Office of Naval Research awarded him $900K for his project, Video Search and Retrieval, which will focus on developing a visual search system. Think Google but for security videos.

“Our initial idea was to develop a system that could annotate web videos,” said Saligrama, who collaborated with Pierre-Marc Jodoin at the University of Sherbrooke on early stages of this research. “That project turned out to be extremely challenging so we started to focus on surveillance videos, where the footage is obtained in a controlled environment.”

Manually searching large archives of footage can be both time-consuming and monotonous. Saligrama and Ph.D. students, Greg Castanon (ECE) and Yuting Chen (SE), are now working closely with the U.S. Naval Research Laboratory to help change this.

Professor Venkatesh Saligrama (ECE, SE)

Professor Venkatesh Saligrama (ECE, SE)

Chen said she is looking forward to working on this project with Saligrama, who she first encountered while conducting her own research.

“I spent almost a year and a half working on an idea that employs correlating motion clues to calibrating camera networks,” she said. “When I came to BU Systems Engineering and browsed the research papers, I found the exact idea implemented by Venkatesh’s group. I was surprised and just a little bit bitter.”

From there, she knew that she wanted to study with Saligrama.

“He is an experienced researcher and just as passionate and curious as a young freshman,” she said. “I find that one sentence from him can help me through a problem that’s been troubling me for weeks.”

Chen, Castanon and Saligrama hope that together, they can make the process of searching through security footage more automated and responsive to user query video searches.

“Currently, for many YouTube videos, there are textual meta-tags that are used in the search process,” Saligrama explained. “For surveillance videos, we do not often have this so our searches need to be based purely on visual features and patterns.”

One of the challenges in video search is that activity patterns can be highly inconsistent and can occur for unpredictable amounts of time.

“Unlike image search though, videos have some temporal patterns we can exploit,” said Saligrama.

In the future, Saligrama hopes that the research will not only improve security but improve medical database searches as well.

For more information about the project, visit our Research Spotlight page.

-Rachel Harrington (rachelah@bu.edu)

EPIC Ribbon-Cutting Welcomes Industry, Local Officials

January 21st, 2014 in Alumni, Events, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, News-CE, News-EP, News-ISS, Research, Research-CE, Research-EP, Research-ISS, Students, Undergraduate Programs, Undergraduate Student Opportunities, Undergraduate Students

Features tour of ENG’s new design, manufacturing studio

The Engineering Product Innovation Center (EPIC) will train BU engineers “for the future manufacturing economy in this country,” says EPIC director Gerry Fine. Photos by Mike Spencer

The Engineering Product Innovation Center (EPIC) will train BU engineers “for the future manufacturing economy in this country,” says EPIC director Gerry Fine. Photos by Mike Spencer

The Engineering Product Innovation Center (EPIC) hadn’t yet opened for its inaugural semester, and it already had a wait list of students eager to register for classes in the sleek, glass-fronted Commonwealth Avenue building that not too long ago was the Guitar Center. That bodes well for the College of Engineering and the University officials and corporate sponsors who made the new facility possible.

ENG will host EPIC’s ribbon-cutting ceremony this Thursday, January 23. Among those present will be President Robert A. Brown, ENG Dean Kenneth Lutchen, local dignitaries, and key corporate partners, including representatives from principal industry sponsors GE AviationProcter & GamblePTC, and Schlumberger.

Lutchen, who is also an ENG professor of biomedical engineering, says that EPIC’s opening “now begins the opportunity for us to transform our engineering education at the undergraduate level to really create a much more powerfully enabled graduate who understands the process of designing products from conception to deployment.”

Those skills are particularly important, and valuable, now that manufacturing is making a comeback in the United States. US manufacturers have added at least 500,000 new workers since the end of 2009, energy costs have dropped, and labor costs in competing countries such as China and India have been inching upward.

Companies like Apple and GE are bringing high-tech facilities back home from overseas. While a positive development, “the problem is now there aren’t enough engineers trained in highly technological methods,” says Bruce Jordan, ENG assistant dean of development and alumni relations.

EPIC could help fill that void. “We’re hoping to set a standard for the training of engineers for the future manufacturing economy in this country,” says EPIC director Gerry Fine, an ENG professor of the practice.

Funded through the University, ENG alumni and friends, and regional industry, EPIC’s 20,000-square-foot space houses a computer-aided design (CAD) studio, demonstration areas, fabrication facilities, materials testing, and project management software available to engineering students in all specialties — from computer and electrical engineering to biomedical engineering and nanotechnology. The facility has a flexible design and offers students supply chain management software, 3-D printers, robotics, laser processing, and around-the-clock digital access to the studio’s online resources.

A representative from each principal industry sponsor, GE Aviation, Procter & Gamble, PTC, and Schlumberger, will sit on EPIC’s Industrial Advisory Board, whose primary function will be to offer suggestions on how the ENG undergraduate curriculum might be redesigned to better prepare students for employment in the years ahead.

Timothy Jackman (ENG’15) with one of EPIC’s 3-D printers, which he used to create a miniature car from a digital model.

Timothy Jackman (ENG ’15) with one of EPIC’s 3-D printers, which he used to create a miniature car from a digital model.

“We want to create as many options for our graduating students as possible,” Fine says. “By teaching them some of the things that regional industry wants, we think we’re giving our students more options. And we’re making our students more desirable to potential employers.”

Representatives from the principal sponsors will also participate in guest lectures and provide case studies and projects, and the companies will offer internship and employment opportunities to qualified students. 

While other universities have manufacturing-oriented centers, most focus on basic research, but EPIC allows engineering students to put theory into practice by converting their ideas into products that could one day benefit society.

Fine has given tours of the facility to at least five teams from other universities since June. “We’re not aware of anyone who’s invested in this scale and made this commitment to undergraduate education,” he says.

“When I first heard from Dean Lutchen about the idea of EPIC, I was thrilled,” says Michael Campbell (ENG ’94), executive vice president of PTC’s CAD segment, who will serve on EPIC’s advisory board. “I always felt that my engineering education lacked that real-world perspective, that real-world exposure to the challenges, processes, and complexities of collaboration and the sophistication of tools. Now we have a chance to share all of that with students.”

J. David Rowatt, research director and technical advisor at Schlumberger, echoes that sentiment. “There were so many things I didn’t learn in school that I picked up on the job,” he says. “Some of these are clearly being addressed by what EPIC is trying to do,” which is exposing students to the entire engineering process — from conception and manufacturing to working on deadlines and understanding resource constraints.

Greg Morris, strategy and business development leader for additive manufacturing with GE Aviation, says this generation of students grew up in a world where computers and software were second nature, but tinkering under the hood of a car was not. EPIC will provide engineering students with the hands-on experience that gives them an advantage in the marketplace. “I can’t tell you how much that resonates with an employer,” he says.

Both BU and its partners see EPIC as a win-win. ENG faculty and students will benefit from a revamped curriculum and access to global leaders in innovation and manufacturing, while industry partners will interact with the University’s deep bench of cutting-edge researchers and get exposure to a new crop of engineers.

“If we tap into EPIC,” says Bruno De Weer, the vice president of global engineering at Procter & Gamble, “we can find ourselves connected with another hub of innovation that brings the very best.”

The EPIC ribbon-cutting ceremony will be held at 4:30 p.m. on Thursday, January 23, at 750 Commonwealth Ave., followed by a reception and tours for those invited. The event is not open to the public.

-Leslie Friday, BU Today

Sharing Innovative Research, Succinctly

January 21st, 2014 in Awards, Events, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, Lectures, News-CE, News-EP, News-ISS, Recognition, Research, Research-CE, Research-EP, Research-ISS, Students

Ph.D. student, Delaram Motamedvaziri, was one of two winners of the Best CISE Presenter awards. Photo by Dan Aguirre for Boston University Photography.

Ph.D. student, Delaram Motamedvaziri, was one of two winners of Best CISE Presenter awards. Photo by Dan Aguirre for Boston University Photography.

Boston University students have big ideas – whether they’re aiming to prevent cyber attacks or using GPS data to improve cattle herding. As good as their work is though, they don’t always know the best way to present their research.

Enter the Center for Information & Systems Engineering (CISE) Graduate Student Workshop (CGSW), designed to give Ph.D. and Master’s candidates a chance to present their work.

View a slideshow from the event.

Ph.D. students, Yasaman Khazaeni, Greg Castanon, and Jing Wang, initially came up with the idea for the event last semester and hoped it would give their classmates a chance to practice speaking in front of a large audience.

“One of the main issues we have as students becomes clear at conferences,” said Khazaeni. “We’ve done great research but don’t present it well.”

Often times, she added, engineering students come from international backgrounds and don’t have enough confidence to present in English.

“By speaking in front of a friendly audience, as opposed to a conference where you’d know few people in the audience, your classmates and professors can offer feedback and really help you smooth out your final presentation,” said Khazaeni.

Ph.D. students, Jing Wang, Greg Castanon, and Yasaman Khazaeni (pictured from left to right), organized the CISE Graduate Student Workshop in hopes of giving their classmates a chance to practice speaking in front of a large audience. Photo by Dan Aguirre for Boston University Photography.

Ph.D. students, Jing Wang, Greg Castanon, and Yasaman Khazaeni (pictured from left to right), organized the CISE Graduate Student Workshop in hopes of giving their classmates a chance to practice speaking in front of a large audience. Photo by Dan Aguirre for Boston University Photography.

Khazaeni, who helped choose 14 students to present out of a pool of 23 applicants, said that the event also allowed CISE students to learn from classmates and discover more about the projects they’ve been working on.

Among those she learned from were Ph.D. students, Morteza Hashemi and Delaram Motamedvaziri, who took home the Best CISE Presenter awards.

Hashemi, who is advised by Professor Ari Trachtenberg (ECE, SE), spoke about his project, Coded Data Sharing in Intra-Car Wireless Sensor Networks. He has been working with Trachtenberg, Professor David Starobinski (ECE, SE), Ph.D. student, Wei Si, and General Motors Research to determine if using wireless sensor networks (WSN) might allow for a greener way to construct tomorrow’s vehicles. The work previously won the Center for Reliable Information Systems and Cybersecurity Award as well as the Provost’s Award at Scholars Day last year.

Advised by Professor Venkatesh Saligrama (ECE, SE), Motamedvaziri spoke about her work, “Poisson Statistics and the Future of Internet Marketing.”

“The effectiveness of search engine marketing is dropping while the power of social media marketing is rising,” she explained. “Mathematics would suggest that social media is now the better advertising strategy.”

She said that though her research focused on total hits advertisements received, she’d like to expand her work in the future by looking at data concerning how long a person stayed on a website.

“Ultimately, we’re more interested in seeing transactions occur as opposed to clicks,” said Motamedvaziri.

Also honored at a reception at the BU Castle following the presentations were Setareh Ariafar, the Most Attentive CISE Student, and Professor David Castañón (ECE, SE), awarded for his contributions to CISE. Because 20 students attended all fourteen presentations, the most attentive of them was chosen by raffle.

In case any students left the workshop having doubts about their speaking skills, Professor Christos Cassandras (ECE, SE) closed the day by offering some advice, including “never overestimate the intelligence of your audience” and “the maximum pieces of information that should appear on a slide is two.”

“Giving a good talk is a difficult thing,” he said. “It’s as much of an art as a science.”

-Rachel Harrington (rachelah@bu.edu)

New BU Initiative to Boost STEM Education

December 3rd, 2013 in Courses, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, News-CE, News-EP, News-ISS, Students, Undergraduate Programs, Undergraduate Student Opportunities, Undergraduate Students

Goldberg, Wong named to coordinate teaching, recruitment

As part of the BU's STEM Education Initiatives, ENG's Joyce Y. Wong (left) will direct a new University effort to recruit and advance women in STEM fields. Bennett Goldberg, a CAS and an ENG professor, has long been involved in STEM education. He was recently appointed director of BU's STEM Education Initiatives. Photos by Kalman Zabarsky

As part of the BU's STEM Education Initiatives, ENG's Joyce Y. Wong (left) will direct a new University effort to recruit and advance women in STEM fields. Bennett Goldberg, a CAS and an ENG professor, has long been involved in STEM education. He was recently appointed director of BU's STEM Education Initiatives. Photos by Kalman Zabarsky

It’s a fitting acronym: STEM is the basis for budding careers, for the growing of cutting-edge research, and for increased competence across a range of disciplines. While Boston University has long shown a strong commitment to education in STEM fields — science, technology, engineering, and mathematics — it has recently launched an initiative to improve that commitment by boosting interdisciplinary cooperation, recruiting more students in underrepresented populations, and arming the University with even more of a competitive edge in seeking outside funding.

Jean Morrison, University provost and chief academic officer, recently named two BU faculty members to take STEM to the next level. Bennett Goldberg, a College of Arts & Sciences professor of physics and a College of Engineering professor of electrical and computer engineering and of biomedical engineering, has been appointed director of BU’s STEM Education Initiatives. Joyce Y. Wong, an ENG professor of biomedical engineering and of materials science and engineering, has been named director of a new University effort to advance women in STEM fields.

Goldberg will be responsible for oversight and coordination of efforts to “increase effectiveness of instruction” in STEM subjects, says Morrison in announcing the appointment. “A world-class scientist, innovator, and teacher, who has devoted his career to impactful interdisciplinary scholarship, Professor Goldberg is exceptionally equipped for this responsibility,” she says. The new post includes four major areas of oversight: leading an effort to “articulate the aspirations” of BU faculty for undergraduate STEM education; working with schools and colleges and the Center for Excellence and Innovation in Teaching to advance the “sharing of best practices”; working to boost recruitment of students, including women and minorities, underrepresented in STEM programs; and directing the development, writing, and submission of grants supporting STEM education at the University.

“STEM education at BU has a fair amount of innovation, but we don’t have a really coordinated effort or strategic plan,” says Goldberg. “If you look at what’s happening in higher education in the United States, there are a lot of pressures, and our model for the future must include high-engagement learning — moving away from the traditional talking head at the front of the class.” In STEM education in particular, the talking head model reaches “a very small fraction of our students,” he says.

STEM education at BU is already embracing this move away from the traditional lecture model, but Goldberg will coordinate the establishment of more interactive learning studios, more peer learning, more small seminars like those used in some engineering courses, and more roundtable teaching. “My job is really to figure out what kind of support is necessary and how we can create a collective vision,” he says. “It’s planning, it’s discussing, it’s developing, and it’s implementing.”

Goldberg, who was named BU’s 2013 United Methodist Scholar-Teacher of the Year, has long held an active interest in improving education in math and the sciences. Director of the Center for Nanoscience and Nanobiotechnology since 2004, he earned a bachelor’s from Harvard University and a master’s and a doctorate from Brown University. Of Goldberg’s work cultivating clean energy sources, developing new drug delivery systems, and diagnostic methods, Morrison says that he “has committed himself to breaking boundaries, working across fields of scientific research in a way that pushes the limits of our capabilities.”

Wong is “uniquely positioned to help BU emerge as a leader in addressing the underrepresentation of women” in STEM fields, according to Morrison. She notes that while BU attracts outstanding female students and faculty in these fields, “there is more work to be done both in recruitment and retention and in our endeavors to support their success.” Wong’s undergraduate and doctoral degrees are from the Massachusetts Institute of Technology. Her research focuses on the development of biological materials that could aid in detecting cancer and cardiovascular disease.

“I look forward to engaging all members of the BU community and to reaching out to the many people on campus who are running excellent programs at all levels, precollege, undergraduate, graduate, postdoctoral, and faculty, to advance STEM in an equitable manner,” says Wong.

-Susan Seligson, BU Today

Combatting the Age of Big Data

December 2nd, 2013 in Events, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, Lectures, News-EP, Research, Research-EP, Students, Undergraduate Programs, Undergraduate Student Opportunities, Undergraduate Students

Professor Larry A. Coldren, University of California, Santa Barbara, takes questions during a Boston University Electrical & Computer Engineering Distinguished Lecture.

Professor Larry A. Coldren, University of California, Santa Barbara, takes questions during a Boston University Electrical & Computer Engineering Distinguished Lecture.

Telecommunications companies – those that allow us to talk on the phone, communicate over the Internet and watch cable television – used to operate under the notion that there was an infinite amount of fiber bandwidth available to transmit these signals. Then we moved into the Y2K era.

“There was a big explosion of data around the year 2000,” said Larry A. Coldren, the Fred Kavli Professor of Optoelectronics and Sensors at the University of California, Santa Barbara. “Computers were also getting faster and faster at this time and the demand for bandwidth was rising quickly.”

Coldren and his team had started looking at photonic integrated circuits (PICs), devices that allow signals to travel on optical waves on semiconductor chips, back in the 1980s and discovered that they could viably be produced much like analogous electronic integrated circuits (ICs) that generally use electrical wires for transferring data.

Last month, he spoke about his research during Boston University’s Electrical & Computer Engineering Distinguished Lecture Series. He suggested that PICs could be the key component in the future of telecommunications.

Just a couple of decades ago, wavelength-division multiplexing (WDM) was introduced to meet the demand for more fiber bandwidth. This method allowed a number of signals to be simultaneously transferred on a single optical fiber. However, at the terminals where the WDM channels must be either combined or separated, the optical and electronic equipment became more and more complex as the channel count and signal speed increased. That’s where Coldren’s research comes into play.

“PICs have the potential of improved performance, reliability and cost while also reducing the size, weight and power of the equipment,” said Coldren.

PICs for various applications have been made using indium phosphide, silica on silicon, polymer technologies, and silicon photonics. Electronic ICs, however, usually use silicon as a dominant ingredient. Coldren’s team currently focuses on a monolithic indium phosphide integration platform.

“Ultimately, we may find that the best results will come from a hybrid solution using more than one of these materials,” said Coldren.

Today, PICs are widely deployed commercially and outperform many discrete device approaches, but Coldren is optimistic that they can work even better in the future and hopefully result in more environmentally friendly supercomputers and data centers.

“Our efforts have always been focused on making PICs very efficient and very fast,” said Coldren. “Now we need to look at how they can be used to create more green data centers.”

Assistant Professor Jonathan Klamkin (ECE), who introduced Coldren at the lecture, previously had an opportunity to study with Coldren while earning his Ph.D. at UC Santa Barbara.

“I benefitted immensely from his guidance and even use his books in my class here,” Klamkin said. “It’s a pleasure having him on our campus.”

Prior to teaching, Coldren worked at Bell Labs, where he studied surface-acoustic-wave signal processing devices and tunable coupled-cavity lasers. He continued his work at UC Santa Barbara, where he has developed more widely-tunable DBR lasers and efficient, high-speed vertical-cavity-surface-emitting lasers (VCSELs) in addition to his PIC research.

Coldren is a member of the National Academy of Engineering and a Fellow of the Institute of Electrical and Electronics Engineers (IEEE), the Optical Society (OSA) and the Institution of Electrical Engineers (IEE).

Coldren’s talk was the third in the three-part Fall 2013 Distinguished Lecture Series. The seminars will resume in Spring 2014.

-Rachel Harrington (rachelah@bu.edu)

Removing Communication Roadblocks

November 7th, 2013 in Alumni, Awards, Courses, Events, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, News-CE, Publications, Recognition, Research, Research-CE, Students

Distinguished Professor Lev Levitin (ECE)

Distinguished Professor Lev Levitin (ECE)

Over the last few weeks, nearly 20 million Americans tried accessing a broken United States health care site that couldn’t handle the traffic, among other problems. And even if you weren’t one of the many applying for health coverage, you’ve probably experienced network congestion at some point.

Typically, network congestion occurs if a link or node is carrying too much data; as a result, the quality of service drops. The most severe form of communication disruption is deadlocks. A deadlock happens when several messages mutually block each other so that their delivery is not just delayed but stopped permanently.

“This is a long-standing problem, which is practically important and theoretically challenging,” said Distinguished Professor Lev Levitin (ECE, SE). “It has been attracting the efforts of many researchers for decades.”

Professor Mark Karpovsky

Professor Mark Karpovsky (ECE)

Professors Levitin and Mark Karpovsky (ECE) have been working with their students on this problem for several years, developing new algorithms, specifically turn prohibition algorithms, to help direct data and essentially prevent information from being stuck in a deadlock as it travels through communication networks. This work covered a lot of ground by establishing lower and upper bounds for an optimal solution, outlining their discovery of a new class of algorithms, and developing a few algorithms that could actually solve the initial optimization problem.

The last advance on this project was achieved this year by Levitin and his team – ECE alum, Ye Wu (MEng ’13), and Visiting Scholar, Mehmet Mustafa. They have been working on developing new algorithms, specifically turn prohibition algorithms, to help direct data and essentially prevent information from being stuck in a deadlock as it travels through communication networks.

“Without changing the topology of existing networks, we managed to improve saturation points so that congestion is less likely to happen and latency is reduced which means lower waiting time for users,” said Wu.

The team recently presented their work at OPNETWORK 2013, a conference that focused on advancing the state of application and network performance management. Impressed by their research, “A Study of Modified Turn Prohibition Algorithms for Deadlock Prevention in Networks,” the judges awarded them Best Technical Paper.

Ye Wu (left) receives his MEng degree from Professor Selim Ünlü (ECE, BME) at Commencement 2013.

Ye Wu (left) receives his MEng degree from Professor Selim Ünlü (ECE, BME, MSE) at Commencement 2013.

“Computer experiments, executed earlier and in the latest work by Ye Wu and other students under the guidance of Dr. Mustafa, clearly showed the superior performance of our algorithms versus different algorithms suggested by other research groups,” said Levitin. He went on to add that the majority of publications in the field are on ad hoc algorithms as opposed to the “tree-free” algorithms he and his team explored.

The work gave Wu a chance to travel to Washington, D.C., and deliver the presentation at the Ronald Reagan Building and International Trade Center.

“I met some really nice students and professors from different countries who were happy to talk about their research,” said Wu. “The audience, I think, was also smart enough to understand the key points of our project and asked really good questions.”

Now a Boston University graduate, Wu looks back at his professor fondly, describing Levitin as open-minded, even when his student was questioning his own theories.

“Professor Levitin is the best professor I’ve ever known,” said Wu. “Even when we had no idea how to begin a project, he’d point us in the right direction.”

-Rachel Harrington (rachelah@bu.edu)

From Battlefield to Lab Bench

November 7th, 2013 in Courses, Faculty, Graduate Programs, Graduate Student Opportunities, Graduate Students, News-CE, News-EP, News-ISS, Research, Research-CE, Research-EP, Research-ISS, Students

NSF Research Program Helps ENG Vets Shape Careers

Christopher Stockbridge in Bifano's Precision Optics Research Lab

Christopher Stockbridge in Bifano's Precision Optics Research Lab

US military personnel return from active duty with highly marketable knowledge and skills, but many find it difficult to quickly parlay their experience into well-paying jobs. To help rectify the situation, the National Science Foundation (NSF) funds the Veteran’s Research Supplement (VRS) program, which allows veterans at selected colleges and universities to participate in industrially relevant research in science, technology, engineering, and mathematics (STEM) — fields in which job openings far outpace the supply of qualified US applicants.

Since the inception of VRS in 2011, the College of Engineering’s NSF Industry/University Collaborative Research Center for Biophotonic Sensors & Systems has welcomed the opportunity to engage veterans in research through this program.

“Vets come to us with an unusually strong work ethic and high confidence but often lack the experience to be comfortable in taking on a big research project,” said BU Photonics Center Director and Professor Thomas Bifano (ME, MSE). “VRS gives them the opportunity to take on such projects and pursue careers in research, which is the main engine of our economy.”

So far two veterans have thrived in faculty-supervised summer projects funded by VRS, emerging not only with new research skills but also a more well-defined career path.

Cliff Chan: From Technician to Engineer

Cliff Chan, who deployed four times in the Middle East and Southeast Asia as an Air Force Guidance and Control Specialist, came to BU seeking to take his skillset to the next level. With a B.S. in mathematics and computer science from the University of California, San Diego, two years developing software for an electronic health records company, and four years maintaining aircraft control systems for the Air Force under his belt, Chan aspired to learn how to design the kinds of technologies he came across during his military service.

To transform himself from a technician to an engineer, he sought a way to earn a master’s degree in electrical engineering in a reasonable timeframe without having to start from scratch, and he found it in the College of Engineering’s Late Entry Accelerated Program (LEAP). Like all LEAP students, Chan spent his first year taking undergraduate engineering courses to get up to speed, but got his first taste of engineering design the following summer (2011), thanks to the VRS program. Working for three months in Professor Jerome Mertz’s (BME) Biomicroscopy Lab within BU’s Center for Biophotonic Sensors and Systems, he developed software that enables microscopes to provide high-contrast images of biological samples in real time.

“The project was a real transition for me, as I had to solve a problem by first figuring out what I needed to learn, and then how to apply it,” recalled Chan, who was used to getting more explicit instructions in the Air Force and had never worked in a research lab. “It opened up my eyes to another world.”

Subsequently hired to work full-time in the Biomicroscopy Lab while completing his Master of Engineering in electrical engineering, Chan has continued to advance microscopy techniques aimed at improving medical diagnostic imaging. The experience has led him to consider working in research and development for defense and other industries, conducting experiments and designing devices with real-world applications.

It has also prepared him to work through the inevitable unexpected challenges that arise in advancing new technologies.

“What I like about Cliff is that he’s undaunted,” said Mertz. “He wants to learn everything that’s out there to tackle his work. The problems we faced were much more complex than I had anticipated, but Cliff’s efforts definitely kept us on track, and kept us progressing.”

Chris Stockbridge: From Defusing Roadside Bombs to Protecting Future Soldiers

Photonics Center Director and Professor Thomas Bifano (ME, MSE), Professor Jerome Mertz (BME) and Cliff Chan in Mertz's Biomicroscopy Lab (Photo by BU Photo Services)

Photonics Center Director and Professor Thomas Bifano (ME, MSE), Professor Jerome Mertz (BME) and Cliff Chan in Mertz's Biomicroscopy Lab (Photo by BU Photo Services)

Chris Stockbridge returned to civilian life after five years as an officer and combat engineer in the Army that included two tours of duty in Iraq. During each deployment he came to appreciate the engineering behind technologies used to protect soldiers, including devices used to search for and destroy roadside bombs. Equipped with those experiences and a B.S. in mechanical engineering from the US Military Academy at West Point, he applied to the PhD program in mechanical engineering at BU with the goal of working as a civilian engineer at a national military research lab.

“I came to BU to study micro-electro-mechanical systems (MEMS), particularly those which could be of great value in military applications, and because I knew that the Photonics Center has a strong relationship with the US Army Research Laboratory,” said Stockbridge.

Supported last summer by the VRS program to serve as the lead student in an NSF-funded project in Bifano’s Precision Optics Research Lab, he began fabricating MEMS for a new deformable mirror design for use in the Keck and other very large telescopes. Aimed at supplying the telescopes with mirrors that have more pixels for finer imaging control, his work could enable astronomers to make observations that shed light on the origin of the universe and the existence of life on extra-solar planets.

“The primary benefit to me from this project was spending more time doing hands-on MEMS fabrication work,” said Stockbridge, who had already spent two years working on the design of deformable mirrors in Bifano’s lab. “While I would prefer to work more in design after graduation, the hands-on skills are important for getting an appreciation of each process step that goes into building a MEMS mirror.”

As he has cultivated those skills, Stockbridge has proven to be an invaluable asset in Bifano’s lab.

“Chris is a consummate engineer who seems to thrive on tackling problems that are both thorny and hard, and I can see in his work the experience and training that he gained while serving in the Army,” said Bifano. “He is a natural collaborator, and all of the other students in my lab and in the labs of my close colleagues have come to rely on him for his strong sense of mechanical design and for his eagerness to help those around him. Chris will make a great professional engineer.”

-Rachel Harrington (rachelah@bu.edu)