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Lee S.,Creative IT | Jung H.,University of Washington
Proceedings - 2016 IEEE International Conference on Healthcare Informatics, ICHI 2016 | Year: 2016

Regular jogging help people maintain their health. However, it is burdensome to keep working out without clear motivation. Although mobile applications has been developed to overcome the challenge, little is known about the guildelines for designing mobile applications that address the needs and barriers of joggers. In this study, we identified joggers' needs and barriers and used them to produce ten principles for designing mobile applications. We then created Mutiv, a web-based prototype of the mobile application based on the principles and evaluated the satisfaction of the joggers of the prototype. © 2016 IEEE.

Kim M.I.,KAIST | Kim M.S.,Pohang University of Science and Technology | Kim M.S.,Creative IT | Woo M.-A.,KAIST | And 6 more authors.
Nanoscale | Year: 2014

Enzyme-linked immunosorbent assays (ELISAs) have most widely been applied in immunoassays for several decades. However, several unavoidable limitations (e.g., instability caused by structural unfolding) of natural enzymes have hindered their widespread applications. Here, we describe a new nanohybrid consisting of Fe3O4 magnetic nanoparticles (MNPs) and platinum nanoparticles (Pt NPs), simultaneously immobilized on the surface of graphene oxide (GO). By synergistically integrating highly catalytically active Pt NPs and MNPs on GO whose frameworks possess high substrate affinity, the nanohybrid is able to achieve up to a 30-fold higher maximal reaction velocity (Vmax) compared to that of free GO for the colorimetric reaction of the peroxidase substrate, 3,3′,5,5′-tetramethylbenzidine (TMB), and enable rapid detection of target cancer cells. Specifically, using this new assay system, clinically important breast cancer cells are detected in a 5 min time period at room temperature with high specificity and sensitivity. The remarkably high capability to catalyze oxidation reactions could allow the nanohybrid to replace conventional peroxidase-based immunoassay systems as part of new, rapid, robust and convenient assay systems which can be widely utilized for the identification of important target molecules. © 2013 The Royal Society of Chemistry.

Shin I.,KAIST | Kim J.-J.,Creative IT | Shin Y.,KAIST
Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC | Year: 2014

We present a new 1-cycle timing error correction method, which enables aggressive voltage scaling in a pipelined architecture. The proposed method differs from the state-of-the-art in that the pipeline stage where the timing error occurs can continue to receive input data without halting to avoid data collision. The feature allows the pipeline to avoid recurring clock gating when timing errors happen at multiple stages or timing errors continue to occur at a certain stage. Compared to a state-of-the-art method, the proposed method shows 2-6% energy reduction for a 5-stage pipeline and 7-11% reduction for a 10-stage pipeline. In addition, the proposed logic to propagate clock gating signal is much simpler than that of the previous method [1] by eliminating reverse propagation path of clock gating signal. © 2014 IEEE.

Shin I.,KAIST | Kim J.-J.,Creative IT | Lin Y.-S.,IBM | Shin Y.,KAIST
Proceedings of the International Symposium on Low Power Electronics and Design | Year: 2013

We present a new timing error correction scheme which allows each pipeline stage to halt for one cycle only. The small timing penalty for the error correction operation in the proposed scheme makes it possible to eliminate the extra timing guardband that was needed to accommodate timing uncertainty due to process variations. As a result, lower supply voltage can be used with the proposed scheme for low power operations. Compared to the previous 1-cycle error correction scheme which uses two-phase transparent latch based pipeline [1], the proposed scheme can be applied to the pipeline based on more popular clocking elements such as flip-flop or pulsed latch. © 2013 IEEE.

Yum D.H.,Pohang University of Science and Technology | Lee P.J.,Pohang University of Science and Technology | Lee P.J.,Creative IT
IEEE Transactions on Wireless Communications | Year: 2012

As wireless sensor networks are often deployed in adverse or hostile environments, key management schemes are required for sensor nodes. The random key predistribution (RKP) scheme is a probabilistic key management scheme where each node is preloaded with a subset of keys that are randomly selected from a pool of keys. If a pair of neighbor nodes have a common key, it can be used to establish a secure link between the nodes. The q-composite RKP scheme requires that a pair of neighbor nodes have at least q common keys for a secure link. In this article, we show that the previous security analysis (i.e., resilience against node capture) of the q-composite RKP scheme is inaccurate and present new formulae for resilience in the RKP scheme and the q-composite RKP scheme. © 2002-2012 IEEE.

Yu S.-C.,Creative IT | Yuh J.,Korea Aerospace University | Kim J.,KAIST
Ocean Engineering | Year: 2013

Conventional underwater manipulation is performed by a remotely operated vehicle (ROV) equipped with a rigidly connected multi-link arm. However, accurate manipulation requires the ROV to have excellent maneuverability, which limits the design flexibility and capabilities of the vehicle. This paper instead proposes the use of a small, deployable, and highly maneuverable agent ROV as an end effector, which is connected to the main vehicle by a flexible smart cable. This cable tracks the relative position of the agent, thus eliminating the need for additional positioning sensors and allowing significant size reduction for the agent. In addition, to compensate for the limited lifting capability of the small agent, it is equipped with active buoyancy control. The proposed system can be applied to common autonomous underwater vehicles (AUVs) with minimal modification for coarse station-keeping. The whole system is operated as a conventional AUV under normal operating conditions, but the agent is deployed when manipulation or precise monitoring is necessary. Numerical simulations were performed for dynamic analysis and prototype design of the agent vehicle, and this design was implemented as a model-scale system for experiments in a test tank. This implementation confirmed the feasibility and potential capabilities of the proposed manipulation system concept. © 2013 Elsevier Ltd.

POHANG, SOUTH KOREA, March 03, 2017-- Dr. Young-Seok Kim has been included in Marquis Who's Who. As in all Marquis Who's Who biographical volumes, individuals profiled are selected on the basis of current reference value. Factors such as position, noteworthy accomplishments, visibility, and prominence in a field are all taken into account during the selection process.A practiced expert in the field of sports science & technology, Dr. Kim serves as a professor in the Department of Creative IT Engineering and vice director of the Future IT Innovation Laboratory at Pohang University of Science and Technology (POSTECH). Additionally, he serves as the director of the Sports Engineering Institute for POSTECH. Dr. Kim is a pioneer in sports science and technology in Korea, and as such, he conducts research in the field and developed a course in sports ICT convergence. Earlier in his career, Dr. Kim held professional roles, including senior researcher at Cheil Worldwide, Samsung and the Institute for Sports Science at Seoul National University, and secretary general, head of a government organization of Sports in Gyeonggi Province, Korea.Dr. Kim holds a Ph.D. in sports science, Seoul National University. Throughout his career, he has contributed his extensive and unique knowledge to a plethora of research and projects. In the early 2000s, he lent his expertise to the Olympic Games (the Sydney 2000, the Salt Lake 2002, and the Athens 2004). One of Dr. Kim's upcoming projects has him serving as part of the Sports ICT Convergence Research and Development, Ministry of Culture, Sports, and Tourism, Korea where he is working on the development of a multi-view, multi-channel broadcasting system for the PyeongChang 2018 Winter Olympic Games. Notably, Dr. Kim has also contributed his knowledge to the book "Deciphering the 12 Codes of Korean Football," along with other scholars.Dr. Kim's professional affiliations include the Korean Society for Sports Management, the IEEE, and the Journal of Global Sports Management. Over the years, he has been celebrated for his professional accomplishments, earning the Excellent Teaching Award from POSTECH, the Management Innovation of the Year Award from the government, Gyeonggi Province, Korea, and an Achievement Award for Dedication to the Development of International Sports from HRH Infanta Dona Pilar, IOC member of Spain.About Marquis Who's Who :Since 1899, when A. N. Marquis printed the First Edition of Who's Who in America , Marquis Who's Who has chronicled the lives of the most accomplished individuals and innovators from every significant field of endeavor, including politics, business, medicine, law, education, art, religion and entertainment. Today, Who's Who in America remains an essential biographical source for thousands of researchers, journalists, librarians and executive search firms around the world. Marquis publications may be visited at the official Marquis Who's Who website at

Zhang Y.,State University of New York at Buffalo | Jeon M.,State University of New York at Buffalo | Jeon M.,Creative IT | Rich L.J.,Roswell Park Cancer Institute | And 12 more authors.
Nature Nanotechnology | Year: 2014

There is a need for safer and improved methods for non-invasive imaging of the gastrointestinal tract. Modalities based on X-ray radiation, magnetic resonance and ultrasound suffer from limitations with respect to safety, accessibility or lack of adequate contrast. Functional intestinal imaging of dynamic gut processes has not been practical using existing approaches. Here, we report the development of a family of nanoparticles that can withstand the harsh conditions of the stomach and intestine, avoid systemic absorption, and provide good optical contrast for photoacoustic imaging. The hydrophobicity of naphthalocyanine dyes was exploited to generate purified ∼ 20nm frozen micelles, which we call nanonaps, with tunable and large near-infrared absorption values (>1,000). Unlike conventional chromophores, nanonaps exhibit non-shifting spectra at ultrahigh optical densities and, following oral administration in mice, passed safely through the gastrointestinal tract. Non-invasive, non-ionizing photoacoustic techniques were used to visualize nanonap intestinal distribution with low background and remarkable resolution, and enabled real-time intestinal functional imaging with ultrasound co-registration. Positron emission tomography following seamless nanonap radiolabelling allowed complementary whole-body imaging. © 2014 Macmillan Publishers Limited.

Joe H.,Creative IT | Kim M.,Creative IT | Yu S.-C.,Creative IT
Nonlinear Dynamics | Year: 2014

We propose the use of a second-order sliding-mode controller (2-SMC) to stabilize an autonomous underwater vehicle (AUV) which is subject to modeling errors and often suffers from unknown environmental disturbances. The 2-SMC is effective in compensating for the uncertainties in the hydrodynamic and hydrostatic parameters of the vehicle and rejecting the unpredictable disturbance effects due to ocean waves, tides, and currents. The 2-SMC is comprised of an equivalent controller and a switching controller to suppress the parameter uncertainties and external disturbances, and its closed-loop system is exponentially stable in the presence of parameter uncertainties and unknown disturbances. We performed numerical simulations to validate the proposed control approach, and experimental tests using Cyclops AUV were conducted to demonstrate its practical feasibility. The proposed controller increased the accuracy of trajectory tracking for an AUV in the presence of uncertain hydrodynamics and unknown disturbances. © 2014, Springer Science+Business Media Dordrecht.

Jung M.,Creative IT
Proceedings - International Conference on Mobile Software Engineering and Systems, MOBILESoft 2016 | Year: 2016

To alert diabetes patients of incipient hypoglycemia, we developed a hypoglycemia prediction algorithm and elicited design inspiration for new glucose management software. To identify the predictive factors, we conducted surveys, interviews, and diary studies, and developed a prediction model that uses self-monitored blood glucose. We tested the accuracy of prediction algorithms achieved by different machine learning methods, and found that the proposed algorithms have potential to predict hypoglycemia. Based on the proposed algorithm, we designed a new mobile application concept to support patients' self-care, especially to avert hypoglycemia. Copyright is held by the owner/author(s).

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