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Ulsan, South Korea

Ulsan National Institute of Science and Technology, simply referred to as UNIST , is the first independent national university established as a national research university in Ulsan, South Korea. UNIST was founded in 2007 in response to growing demand for higher education in the Korean industrial capital of Ulsan, where world-renowned automotive , shipbuilding , petrochemical , and secondary cells industries are clustered. The vision of UNIST is to become a world-leading university to advance science and technology for the prosperity of humankind. With strong support from central and local governments, UNIST aims to rank in the top 10 of globally competitive universities emphasizing science and technology by the year 2030. The strategies for reaching this goal include creative, interdisciplinary and global education and research. Wikipedia.

Moon H.R.,Ulsan National Institute of Science and Technology | Lim D.-W.,Seoul National University | Suh M.P.,Seoul National University
Chemical Society Reviews | Year: 2013

In this review, we highlight various preparative strategies and characterization methods for metal nanoparticles fabricated in porous metal-organic frameworks (MOFs) or porous coordination polymers (PCPs), and their applications in hydrogen storage and heterogeneous catalysis. © 2013 The Royal Society of Chemistry.

Jiang Y.,Nanyang Technological University | Park C.-M.,Ulsan National Institute of Science and Technology
Chemical Science | Year: 2014

We have developed a dual reaction manifold that enables the selective synthesis of both pyridines and pyrroles from the common substrates α-diazo oxime ethers. The strong propensity of 1,3-dienyl nitrenes for 4π-electrocyclization to give pyrroles could be diverted to 6π-electrocyclization via a 1,6-hydride shift or prototropic isomerization, leading to the exclusive formation of pyridines by employing metal nitrene complexes derived from α-diazo oxime ethers under Rh(ii) catalysis. Furthermore, an orthogonal catalytic system has been identified that promotes the selective formation of 1H-pyrroles from the same substrates by redirecting the reactivity of vinyl 2H-azirine intermediates. This journal is © the Partner Organisations 2014.

Jung Y.,Ulsan National Institute of Science and Technology
Journal of Computer-Mediated Communication | Year: 2011

Despite an exponentially increasing number of registered users, social virtual worlds have the problem of a high user attrition rate. It is thus meaningful to explore which factors influence users' continued use of social virtual worlds. The current study attempts to find these factors in unique characteristics (e.g., 3-dimentional environment, avatar interaction, and user empowerment) in the world, which can be sources for retaining users. Specifically, the study employs the sense of presence and perceived autonomy. 194 users of Second Life, which is the largest social virtual world, participated in the survey. The findings support the argument that the sense of presence and autonomy are influential in users' continued use of social virtual worlds. © 2011 International Communication Association.

Park S.,Ulsan National Institute of Science and Technology
Lab on a chip | Year: 2012

We describe a microfluidic concentrator array device that is integrated with microfabricated ratchet structures to concentrate motile bacterial cells in desired destinations with required cell densities. The device consists of many pairs of concentrators with a wide range of spacing distances on a chip, and allows cells in one concentrator to be physically separated from but chemically connected to cells in the other concentrator. Therefore, the device facilitates quantification of the effect of spacing distance on the cell-to-cell communication of synthetically engineered bacterial cells. In addition, the device enables us to control the cell number density in each concentrator unit by adjusting the concentration time and the density of cell suspensions, and the basic concentrator unit of the device can be repeatedly duplicated on a chip. Hence, the device not only facilitates an investigation of the effect of cell densities on cell-to-cell communication, but it can also be further applied to an investigation of cellular communication among multiple types of cells. Lastly, the device can be easily fabricated using a single-layered soft-lithography technology so that we believe it would provide a simple but robust means for many synthetic and systems biologists to simplify and speed up their investigations of the synthetic genetic circuits in bacterial cells.

Chang B.-Y.,Pohang University of Science and Technology | Park S.-M.,Ulsan National Institute of Science and Technology
Annual Review of Analytical Chemistry | Year: 2010

This review describes recent advances in electrochemical impedance spectroscopy (EIS) with an emphasis on its novel applications to various electrochemistry-related problems. Section 1 discusses the development of new EIS techniques to reduce measurement time. For this purpose, various forms of multisine EIS techniques were first developed via a noise signal synthesized by mixing ac waves of various frequencies, followed by fast Fourier transform of the signal and the resulting current. Subsequently, an entirely new concept was introduced in which true white noise was used as an excitation source, followed by Fourier transform of both excitation and response signals. Section 2 describes novel applications of the newly developed techniques to time-resolved impedance measurements as well as to impedance imaging. Section 3 is devoted to recent applications of EIS techniques, specifically traditional measurements in various fields with a special emphasis on biosensor detections. Copyright © 2010 by Annual Reviews. All rights reserved.

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