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Wireline communications in a wireless world

Published: 2017-11-21

It is possible to get a fiber-like Internet speed without bothering about pulling a fiber home. Ultra-fast Internet speeds are coming through the regular copper based phone lines. The latest technology behind this buzz is G.fast. The main idea of...

The first half of the Yezi Huang?s PhD thesis focuses on the copper segment of the network, and makes sure that the Gbps-level network speeds brought by the fiber are effectively forwarded to the end users. As the world becomes more wireless, the thesis also illustrates the feasibility of using the fixed lines to improve the radio coverage. The studies in the thesis ensure that the fixed lines will not introduce additional interference to the carried radio signal, and that the radio signal will not bring too much redundant information.
Before coming to Sweden, a PhD degree was not in Yezi Huang?s wish list. 
? I like signal processing and felt that I had learned a lot by working with Thomas Magesacher, who supervised my Master?s thesis. So when he introduced a PhD position on the topic to me I thought, why not, says Yezi Huang.
?  The interesting part of doing copper line communication is that it is a small community. Shortly after the position started, I got acquainted with most of the European-based industrial and academic people in this area. Directly from them, I kept learning very relevant problems and interesting topics, she continues.  
Analog film and spicy food
Yezi Huang comes from the city Yibin, where the Yangtze river starts, in the Sichuan Province of China, ? also a place famous for spicy food. 
? Cooking Sichuan food with the ingredients bought in Sweden has become one of my favorite activities that I can get relaxed from the tense research work. Regarding hobbies, I like photographing with my analog film camera. I am not good at using all the fancy techniques to take and post-process photos. The film camera nicely covers my shortage with its amazing combination of light and color tones. 
Why Lund University?
? I did my Master?s degree also at LTH, Lund university at the Department of Electrical and Information Technology. After I decided to continue my studies in Sweden, Lund University was on the top of my list, for its historical environment and giving good education in telecommunication, Yezi Huang continues.
Commuting from Stockholm
The special setting of this PhD position placed Yezi Huang in Stockholm to have a close cooperation with the industrial partners of the project. 
? It was an excellent advantage. But the negative side was the frequent travelling to Lund to take courses and perform department duties. One can count how many trips would the 90 credits and hundreds of teaching hours equal to. Leaving home at 5:00 am during the Swedish winter time was not pleasant. Cold sandwiches at Malmö airport after a full working day were not enjoyable either. But now when I sit warmly indoor and start recalling the four and half years? experience, I feel proud that I made it, she says. 
This October Yezi Huang started a new career at Ericsson Research in Stockholm. 
? It was a natural move for me, and I continued with the work that was presented in the last piece of the thesis. Recently, a new project starts which is more related to the upper layers, quite a challenge for me. I did wireless communication during my Master?s degree, and then wireline communication with my PhD. But both are in physical layer. It seems that my telecommunication background will be enriched again with the new assignment, Yezi Huang concludes.
The thesis, Wireline Communications in a Wireless World is available at: http://portal.research.lu.se/portal/en/publications/wireline-communication-in-a-wireless-world(0625cbea-d05e-43ca-88ad-aa894934b1db).html



 


Andreas Develops Functional Structures for Controlling the Properties of Electromagnetic Waves

Published: 2017-11-03

Electromagnetic waves play a key role in the communication networks that today encompass the whole world. These waves interact with obstacles in several different ways. For example are waves generated, redirected and absorbed when illuminating...
? In my thesis, functional structures for electromagnetic waves have been design and characterised, both numerically and experimentally, for different applications. An example of such structures designed in the thesis are: circular polarisation selective structures for satellite communication applications. These structures are used to increase the data throughput of future satellite communication systems. Potentially this results in faster internet in our cell phones. Another example of such structures that I?ve studied are electromagnetic absorbers for radar cross section reduction in aeronautics applications, Andreas Ericson explains.
How come you pursued a PhD?  During his bachelor studies Andreas stumbled upon Gerhard Kristenssons course in Electromagnetic Theory, and this was the start of his career in the field.  ? I was instantly fascinated by electromagnetic phenomena and especially electromagnetic waves. During my Masters, I studied all courses I could find relating to these waves, given by Mats Gustafsson, Daniel Sjöberg, Anders Karlsson and Richard Lundin. After that, I wanted to learn more and realised that a PhD with the Electromagnetic Theory group at EIT was a great way to do this.    Why LTH?
? I was born in Linköping, Sweden, and during my younger years I spent most of my time playing ice hockey. After I graduated high school I decided to move south to Lund to experience the world-renowned education at LTH, as well as the night life of the famous ?student nations?. My first day in Lund, at the Engineering Physics program, I met my wife Malin and at that day I became rooted in Skåne, Andreas continuous. How did you deal with not playing Ice hockey in Lund?
? I have always loved sports in general, and this interest I have kept alive during my time at EIT. Every week, I have had the pleasure of playing floor ball with some colleagues, including my supervisor who also happens to be the head of my department. What are your plans now?
? I am starting a new position in January at a company called TICRA, located in central Copenhagen. They specialise in developing software for design and simulation of space antennas and satellite communication systems. At this company, I will continue working with the technology that was the focus of my research during my PhD, Andreas concludes.     The thesis: Design and Characterization of Functional Structures for Electromagnetic Waves is available at http://portal.research.lu.se/portal/en/publications/design-and-characterization-of-functional-structures-for-electromagnetic-waves(0a2f5392-8b27-48f6-976d-39df2134e6e2).html



 


Nicolae Paladi´s Thesis Helps Build Trust in Cloud Computing

Published: 2017-10-23

Computers are essential to running the services we use daily. Increasingly, we do not need to own a computer; computing is done on centralised computing platforms ? known as clouds ? operated by cloud service providers. While clouds collect, store...
Every day, increasingly more IT infrastructure is migrated to centralised processing, commonly called ?cloud computing?. This includes diverse systems we all use ? from email and on-line laundry booking to medical health records and enterprise systems used by banks and governmental agencies. The increase in the size, complexity and evolution rate of the systems supporting them in the ?cloud computing? paradigm is growing out of the scope of the traditional information security audit frameworks that are central to help maintaining the trust of users in the cloud computing paradigm. This calls for novel mechanisms to both verify the integrity of cloud computing infrastructure and maintain control over core assets. ? In my research, I used widely available hardware security components to develop mechanisms allowing to verify the integrity of software components in the cloud infrastructure. The mechanisms described in my thesis aim to enable integrity verification remotely and on-demand. They are potentially useful both to the cloud service providers themselves, as well as to large cloud tenants, says Nicolae Paladi who recently presented his PhD thesis at department of Electrical and Information Technology at LTH, Lund university. ? When it comes to my subject, what I find fascinating is the role of computer security in building trust and enabling innovations. For example, protocols for secure communication on the Internet were essential for enabling innovations like e-commerce, various on-line services for complex interactions with public authorities, and even on-line voting in some countries, while cryptographic primitives such as hash functions found an application in electronic cash. Since computing and data is increasingly moving into the cloud, building mechanisms to enable trust in the security of cloud systems has the potential to enable further innovations to improve people?s daily lives.
Cloud architecture fragment focused on protecting the security of computation and network communication in cloud platforms.


Who is Nicolae Paladi?
? I am from the Republic of Moldova; having worked for several years at an on-line payments a fintech startup in Stockholm, I joined RISE SICS (previously the Swedish Institute of Computer Science) to write my master thesis in information security. My supervisor, Christian Gehrmann, convinced me to continue at RISE SICS and later helped me enroll to LTH as an industrial PhD student. ? I like being outdoors regardless of the weather, and in my free time I tend to go on long hikes, kayaking or cross-country skiing ? ideally to remote areas. When I am not outdoors I like to organize documentary film screenings with my friends.  Anything you want to share from your PhD time?
?? There were plenty of exciting and funny occasions! As a PhD student, I presented my work at many events, something that even involved travelling to conferences at remote destinations, such as Greenland and Japan. Besides breathtaking views of the Ilulissat Icefjord, in Greenland I experienced the shortest commercial flight so far ? less than 15 minutes, between Ilulissat and Aasiaat. ? Before travelling to Japan I was happy to learn that I did not need a visa to enter the country. However, at the border control in Osaka airport the border control officer took me to a separate room and very politely explained that I could not enter the country without a visa, since my passport was not biometric. I explained that I was a PhD student going to a conference, but he seemed remained unconvinced. As a last resort, I handed him a hard copy of my article, which I discovered by chance in my backpack. After he thoroughly examined the article and offered me a bunch of papers to fill in, I was given a visa and could finally continue to Kyoto where the conference was starting the next day. I learned that I must always carefully read the fine print and notes about travel regulations ? and that nothing beats having a paper printed copy of the research article. What are your plans?
? I will continue creating tools that build trust in distributed environments and allow users to better control their information. We live in an increasingly interconnected world and where data is in the long run the most valuable commodity ? so it is paramount to manage it well, PhD Nicolae Paladi concludes. The PhD Thesis is available at: http://portal.research.lu.se/portal/en/publications/trust-but-verify(22c1d979-2d87-4099-b19c-ea140cd76663).html



 


Gyllene pekpinnen 2017 till Linus Karlsson vid institutionen för Elektro- och Informationsteknik

Published: 2017-10-03

I år gick de pedagogiska priset ?Den gyllene pekpinnen?* till Linus Karlsson vid institutionen för Elektro- och Informationsteknik.
Motivering: I år har vi valt att ge priset till Linus Karlsson framförallt för hans arbete i kursen Datasäkerhet. Där har han utmärkt sig för studenterna genom välgjorda labbar som uppdaterats mitt i kursen för att inkludera nytt material från forskning. Han har även haft en smittsam glädje som både labbhandledare och föreläsare och därför blir ihågkommen hos många studenter som den som alltid har tid med studenter som har frågor och problem. Hans bidrag har lett till att många studenter lämnar kursen med goda minnen och ett förnyat intresse för ämnet. Det som för oss har gjort Linus engagemang extra imponerande är att han har gjort detta utan att ha explicit ansvar för kursen. Han driver på utvecklingen och kvaliteten på våra kurser i egenskap av doktorand och har även fortsatt att göra så i höstens omgång av kursen Digitalteknik där han har gjort videos som täcker de mer komplicerade områdena. Så att även årets tvåor tackar honom för hans jobb. Årets och tidigare års pristagare: https://www.dsek.se/sektionen/srd/goldenrod.php * Gyllene pekpinnen är Datatekniksektionens vandringspris som delas ut till en anställd vid LTH som har presterat utöver det vanliga för studenterna. Mottagare av priset väljs av Datatekniksektionens studieråd och delas högtidligen ut vid Nollegasquen.



 


Elvedin Memisevic dissertation challenges traditional transistors with tunnel transistors of vertical nanowires

Published: 2017-09-22

Traditional transistors are flat, made of silicon semiconductor material and get very hot. In addition, they cannot be made much smaller without short-circuits – an important explanation for why Moore's law of continuously increasing performance sees the end of the road. The doctoral dissertation presented by Elvedin Memisevic on September 14, 2017, challenges the traditional transistors on several fronts. In short, the strategy is to replace the silicon with other semiconductor materials that have better conductive properties. These materials are constructed as vertical nanowires, which means that the transistors are three-dimensional.

Read more in Swedish

The thesis is availible at: portal.research.lu.se.



 


Elvedin Memisevics avhandling utmanar traditionella transistorer med tunneltransistorer av vertikala nanotrådar

Published: 2017-09-20

Traditionella transistorer är platta, tillverkade av halvledarmaterialet kisel och blir mycket varma. Dessutom kan de inte göras mycket mindre utan att kortslutas ? en viktig förklaring till att Moores lag om kontinuerligt ökande prestanda ser vägs...

Materialen som ersätter kisel leder till att man kan använda lägre drivspänningar vilket minskar temperaturen, men också att man kan få snabbare omslag mellan på och av, eller ettor och nollor. Nedskalningen i sig ökar dessutom hastigheten eftersom avstånden blir mindre. Begreppet för dagen är tunneltransistorer. ? Arbetet har pågått länge, men nu kan vi för första gången någonsin tillverka tunneltransistorer med en prestanda som kan jämföras med den hos dagens traditionella transistorer, kommenterar Dr. Elvedin Memisevic. Det är ett viktigt steg för att tunneltransistorn ska gå från att vara den lovande kandidaten till den trovärdiga ersättaren, kommenterar, Elvedin Memisevic,

Varför kallas det för tunneltransistorer?
? I tunneltransistorn används en kvantmekanisk effekt kallat kvantmekanisk tunnling. Eftersom det är ett kvantmekaniskt fenomen finns det tyvärr inte något intuitivt sätt att förstå den. Men just att den existerar tillåter oss att tillverka denna typ av transistorer. För en traditionell transistor är samma effekt av ondo eftersom det begränsar hur mycket de kan skalas ned, säger han. Elvedin föddes i dagens Bosnien och Hercegovina och kom till Sverige som 9-åring 1992.Utbildningsbakgrunden ligger inom civilingenjörsprogrammet Teknisk nanovetenskap på LTH, Lunds universitet, som avslutades med ett examensarbete inom nanoelektronikgruppen på EIT vid LTH.
 ? Jag lärde mig väldigt mycket av examensarbetet. Men jag insåg också att det fanns mycket mer jag inte kunde så det enda alternativet var att fortsätta vidare. Det som jag tycker är mest fascinerande med min forskning är att transistorerna som jag jobbar med kombinerar flera intressanta teknologier, säger Elvedin.
Kan du nämna höjdpunkt under doktorandutbildningen?
? Jag skulle säga att det roligaste, men även det mest nervösa ögonblicket, var när jag och några kollegor åkte till konferensen International Electron Devices Meeting i San Francisco 2016. Konferensen är en av de största vi har i vårt fält. Det som presenteras där får mycket uppmärksamhet och i vårt fall valdes resultaten från Lund ut som en av höjdpunkterna för konferensen, kommenterar Elvedin. Läs om arbetet på: http://www.lu.se/article/tre-ganger-mer-energisnalt-och-battre-prestanda Vad har du för planer för framtiden?
? Som doktorand har jag lärt mig väldigt mycket, dock även nu ser jag att det är väldigt mycket jag inte kan. Forskningen som man bedriver som doktorand är väldigt specifik så mest naturliga steget är att försöka hitta sätt att bredda kompetensen. Det kan antingen vara att man går till en annan forskningsgrupp inom akademin eller söker sig till industrin. Vad det blir vet jag inte för tillfället, säger Dr Elvedin Memisevic. Text: Jonas Wisbrant



 


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