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Op-Ed by Prof. David Helfman: Global Science and Education in the 21st Century
Professor David Helfman from the Department of Biological Sciences and Graduate School of Nanoscience and Technology(https://sites.google.com/site/cellsignalinglaboratory/home) recently wrote an Op-Ed in the January 2013 issue of Journal of Happy Scientists and Engineers that ispublished by the Ministry of Science, Education and Technology, the Republic of Korea. In the article entitled “Global Science and Education in the 21st Century,” Professor Helfman addressed three important issues in science and education, which will have a great impact for the development of world-leading universities in Korea. For the article, please see the attachment.
2013.01.22
View 10563
Household Scale Indoor Position Tracking Technology Developed
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situation or aid in the finding of a lost smartphone. Professor Han Dong Soo (Department of Computer Sciences) and his research team has developed the technology that enables tracking a smartphone’s location indoors using wireless LAN signals accurate to 10 meters. Because the technology utilizes wireless LAN signals and the address of smartphone users, the technology can be implemented for a low cost all over the world. Conventionally the location of a lost smartphone can be found through a telecommunications company. However the location found using the base station is only accurate to 500m~700m and therefore reclaiming lost smartphones is nearly impossible. In addition, there have been unfortunate events where the kidnapped victim called the police but was murdered due to the inaccuracy of smartphone location tracking. The newly developed technology by Professor Han’s team remedies the inaccuracy of smartphone location tracking. Professor Han’s team collected wireless LAN data recorded in the smartphones for a week to analyze the patterns to distinguish patterns between signals recorded in the workplace and in the household. The stability and accuracy of the technology was verified over a period of five months in various locations across Korea with varying population densities. The result was when the total amount of data collected passes 50% of the number of households, the technology show accuracy to 10 meters. The result showed that the new technology can track the location of the smartphone to 10 meters on a household scale. In addition it was possible to distinguish which floor the smartphone was located. The technology is anticipated to improve smartphone positioning. However caution needs to be practiced as the technology requires the address of the user’s workplace and home.
2012.12.21
View 7419
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situ
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situation or aid in the finding of a lost smartphone. Professor Han Dong Soo (Department of Computer Sciences) and his research team has developed the technology that enables tracking a smartphone’s location indoors using wireless LAN signals accurate to 10 meters. Because the technology utilizes wireless LAN signals and the address of smartphone users, the technology can be implemented for a low cost all over the world. Conventionally the location of a lost smartphone can be found through a telecommunications company. However the location found using the base station is only accurate to 500m~700m and therefore reclaiming lost smartphones is nearly impossible. In addition, there have been unfortunate events where the kidnapped victim called the police but was murdered due to the inaccuracy of smartphone location tracking. The newly developed technology by Professor Han’s team remedies the inaccuracy of smartphone location tracking. Professor Han’s team collected wireless LAN data recorded in the smartphones for a week to analyze the patterns to distinguish patterns between signals recorded in the workplace and in the household. The stability and accuracy of the technology was verified over a period of five months in various locations across Korea with varying population densities. The result was when the total amount of data collected passes 50% of the number of households, the technology show accuracy to 10 meters. The result showed that the new technology can track the location of the smartphone to 10 meters on a household scale. In addition it was possible to distinguish which floor the smartphone was located. The technology is anticipated to improve smartphone positioning. However caution needs to be practiced as the technology requires the address of the user’s workplace and home.
2012.12.21
View 8273
Dopant properties of silicon nanowires investigated
Professor Chang Kee Joo Professor Kee Joo Chang’s research team from the Department of Physics at KAIST has successfully unearthed the properties of boron and phosphorous dopants in silicon nanowires, a material expected to be used in next generation semiconductors. The research team was the first in the world to investigate the movement of boron and phosphorous (impurities or ‘dopants’ added for electrical flow) in oxidized silicon nanowires and study the mechanism behind its deactivation. It is nearly impossible to develop a silicon based semiconductor thinner than 10nm, even using the most advanced modern technology. However, the thickness of silicon nanowires are within the nano level and hence, allows a higher degree of integration in semiconductors. For silicon nanowires to carry electricity, small amounts of boron and phosphorous need to be added (‘doping’ process). Compared to silicon, nanowires are harder to create due to the difficulties in the doping process as well as the control of electrical conduction properties. Professor Chang’s research team improved upon the existing simple model by applying revolutionary quantum simulation theory to create a realistic core-shell atomic model. This research successfully investigated the cause of the escape of boron dopants from the silicon core during oxidation. It was also found that although phosphorous dopants do not escape as oxides, they form electrically deactivated pairs which decreases the efficiency. These phenomena were attributed to the film shape of the nano-wires, which increases the relative surface area compared to a same volume of silicon. The research results were published in the online September edition of the world renowned Nano Letters. Figure: The longitudinal section diagram of the Silicon/oxide core-shell model
2012.11.28
View 7322
Seeing Inside Cells with Fiber Optics
Professor Jiho Park’s research team was successful in receiving minute optical signals from inside the cell using optical nano fibers. Through the invention of this technology, we can now look inside cells in high resolution without the use of equipment such as endoscopes that damage cells. We will be able to study the biological phenomena within cells, and thus cure diseases more effectively. Recently, ultra high resolution microscopes have been used to analyze incubated cells. However, because of the need for a very complex and large system, it had been impossible to monitor cells in the less transparent areas of the body in real time. The research team created the wire with a semiconductor created with tin oxides to be only 100 nanometers in diameter (1nanometer= 1/1billion meters). The nanowire is connected to the end of the optical fiber, and the light that comes through the optical fiber is transmitted to particular spots in the cell, and the optical signals from the cell are retrieved back from the cell as well Together with this, based on the fact that nanowires do not damage cells, the research team covered the end of the wire with a photo reactive material and entered this into the cell. They were able to check that the material reacted to light and entered the cell when they transmitted light Accordingly, this showed the possibilities of the use of this technology as a method of treatment to effectively transfer the medication into the cells. Prof. Jiho Park stated that “in this research, we only used cells incubated outside the human body, but soon we will use this technology to stimulate and control cells within the body in a minute scale” as well as that “soon, we will be able to study the biological phenomena inside a cell to study diseases and apply this to cure them more effectively”. This research result has been published in the online publication of ‘Nature Nanotechnology’ on December 18. This study was done through the cooperation of various schools. Besides Prof. Jiho Park, Prof. Seungman Yang from the Biochemistry department, and Doctor Chuljoon Huh from KAIST, Prof. Yeonho Choi from Biomedical Science department of Korea University, Professor Peidon Yang and Doctor Ruoxue Yan from UC Berkeley’s chemistry department, and Luke Lee from UC Berkeley’s bioengineering department participated in the project.
2012.01.31
View 8849
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