In this paper, we present a novel scalable video transmission strategy over multi-input multi-output (MIMO) wireless systems with time-varying channel capacity. It is a great challenge to simultaneously guarantee the QoS for video delivery and maximize the system throughput over time-varying MIMO channel. We demonstrate that, by making full use of estimated channel state information (CSI) through feedback, a cascade of adaptive operations can be designed to satisfy maximum throughput for scalable ...
Tópico(s): Cooperative Communication and Network Coding
2008 - Elsevier BV | Journal of Visual Communication and Image Representation
In this paper, we present a novel joint application physical-layer design (JAPLD) strategy to cost-effectively transmit scalable H.264/AVC video over multi-input multi-output (MIMO) wireless systems. With this approach, the application layer cooperates with the physical layer to maximize the system performance. First, in physical layer, we propose a new layered video transmission scheme over MIMO: adaptive channel selection (ACS). ACS-MIMO is fundamentally different from parallel transmission MIMO ( ...
Tópico(s): Advanced MIMO Systems Optimization
2007 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Circuits and Systems for Video Technology
Daewon Song, Lei Cao, Chang Wen Chen,
In this paper, we propose an integrated robust multiple description coding (MDC) scheme for compressed still images over error-prone channels with both packet loss and random bit errors. Multiple descriptions are first generated independently by using multiple description scalar quantizer (MDSQ). To achieve an excellent error resilient capability for each description, multiple bitstreams are then generated based on wavelet trees along the spatial orientations. The spatial orientation trees in the ...
Tópico(s): Algorithms and Data Compression
2008 - Elsevier BV | Journal of Visual Communication and Image Representation
Chang‐Keun Song, Daewon W. Byun, R. B. Pierce, J. A. Al‐Saadi, Todd K. Schaack, Fred M. Vukovich,
The goal of this study is to assess the impact of the downscale linkage of global chemistry model output on the simulated regional scale O 3 concentration and its vertical and horizontal structure over the continental US. For the global chemistry model, the NASA LaRC‐University of Wisconsin Real‐time Air Quality Modeling System (RAQMS) with a global ozone assimilation framework was used. RAQMS simulation results were downscaled with a RAQMS‐CMAQ linkage tool (RAQ2CMAQ) to provide dynamic lateral boundary ...
Tópico(s): Air Quality and Health Impacts
2008 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Yeo‐Hwan Yoon, Jin‐Won Song, Daewon Kim, Jae‐Hyun Kim, J.‐K. Park, Sang-Keun Oh, Chang‐Soo Han,
Advanced MaterialsVolume 19, Issue 23 p. 4284-4287 Communication Transparent Film Heater Using Single-Walled Carbon Nanotubes† Y.-H. Yoon, Y.-H. Yoon Intelligent and Precision Machinery Research Division, Korea Institute of Machinery and Materials(KIMM), 171 Jang-dong, Yuseong-gu, Daejeon (Korea)Search for more papers by this authorJ.-W. Song, J.-W. Song Intelligent and Precision Machinery Research Division, Korea Institute of Machinery and Materials(KIMM), 171 Jang-dong, Yuseong-gu, Daejeon (Korea) ...
Tópico(s): Thermal Radiation and Cooling Technologies
2007 - | Advanced Materials
Eui‐Young Choi, Se‐Joong Rim, Jong‐Won Ha, Yong-Jin Kim, Sang‐Chol Lee, Duk–Hyun Kang, Seung Woo Park, Jae‐Kwan Song, Daewon Sohn, Namsik Chung,
The aim of this study was to define the phenotypic spectrum of apical hypertrophic cardiomyopathy (ApHCM) and clinical characteristics pertaining to identified subtypes.In 182 consecutive ApHCM patients (58.9 +/- 11.2 years; 142 men) with left ventricular ejection fraction > or =50%, we measured end-diastolic wall thickness of all 16 left ventricular segments to determine patterns of hypertrophy. Echo-Doppler parameters, electrocardiography patterns, and clinical findings were analyzed.ApHCM was classified ...
Tópico(s): Cardiovascular Effects of Exercise
2007 - Karger Publishers | Cardiology
Young-Wook Choi, Hoik Lee, Youngjun Song, Daewon Sohn,
This paper introduces a new approach for preparing magnetic colloidal suspensions with electrostatic repulsion between particles and polyelectrolyte surfactants. The surface charge of the iron oxide particles was positive in acidic aqueous conditions; however the surface charge of the colloid was negative in basic aqueous conditions due to the amphoteric property of Fe2O3. The long-term colloidal stability and particle distribution of the multivalent charged polymers, Poly(4-vinylbenzenesulfonate ...
Tópico(s): Nanoparticle-Based Drug Delivery
2014 - Elsevier BV | Journal of Colloid and Interface Science
We present in this paper an integrated robust image transmission scheme using space-time block codes (STBC) over multi-input multi-output (MIMO) wireless systems. First, in order to achieve an excellent error resilient capability, multiple bitstreams are generated based on wavelet trees along the spatial orientations. The spatial-orientation trees in the wavelet domain are individually encoded using SPIHT. Error propagation is thus limited within each bitstreams. Then, Reed-Solomon (R-S) codes as forward ...
Tópico(s): Error Correcting Code Techniques
2006 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
C.W. Jeong, Dae-Hwan Kang, Daewon Ha, Y. J. Song, Jaejoon Oh, J.H. Kong, Jae-Han Yoo, J.H. Park, Kyung‐Chang Ryoo, Dokshin Lim, S.S. Park, J.I. Kim, Y.T. Oh, J.S. Kim, Jong Min Shin, Jaehyun Park, Y. Fai, G.H. Koh, Giho Jeong, Hongsik Jeong, Kinam Kim,
Abstract We evaluated the limit of scaling bottom electrode contact (BEC) heater size and high resistivity heater to reduce writing current. It was found that the resistivity of heater should be increased for reducing writing current below the heater size of about 50 nm without any undesirable increase of resistance of the crystalline state (SET state, Rset). It was shown in the numerical simulations that the dissipated heat loss through BEC during melting GST was decreased in the increase of resistivity ...
Tópico(s): Non-Destructive Testing Techniques
2008 - Elsevier BV | Solid-State Electronics
Guogang Hua, Daewon Song, David L. Hench, Chang Wen Chen,
In this paper, a wireless channel is viewed as a heterogeneous network in the time domain, and an adaptive video transmission scheme for H.264 scalable video over wireless channels modeled as a finite-state Markov chain processes is presented. In order to investigate the robustness of adaptive video transmission for H.264 scalable video over wireless channels, statistical channel models can be employed to characterize the error and loss behavior of the video transmission. Among various statistical ...
Tópico(s): Advanced Wireless Network Optimization
2007 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
You‐Jung Choi, Jae‐Min Park, Doyeon Hwang, Woong Kook, Yong-Jin Kim, Hidekazu Tanaka, Takeshi Hozumi, Toshinori Yuasa, Lieng H. Ling, Cheuk‐Man Yu, Seung Woo Park, Jong‐Won Ha, Yutaka Otsuji, Jae‐Kwan Song, Daewon Sohn, Seonhee Lim, Seung‐Pyo Lee,
Topological data analysis (TDA) can generate patient-patient similarity networks by analyzing large, complex data and derive new insights that may not be possible with standard statistics.The purpose of this paper was to discover novel phenotypes of chronic primary mitral regurgitation (MR) patients and to analyze their clinical implications using network analysis of echocardiographic data.Patients with chronic moderate to severe primary MR were prospectively enrolled from 11 Asian tertiary hospitals ( ...
Tópico(s): Cardiac Imaging and Diagnostics
2022 - Elsevier BV | JACC. Cardiovascular imaging
Jihyeon Park, Youngsu Kim, Narasimharao Kitchamsetti, Seungju Jo, Seung‐Jae Lee, Ju-Bin Song, Wook Park, Daewon Kim,
Recently, considerable research efforts to achieve advanced design of promising electroactive materials as well as unique structures in supercapacitor electrodes have been explored for high-performance energy storage systems. We suggest the development of novel electroactive materials with an enlarged surface area for sandpaper materials. Based on the inherent micro-structured morphologies of the sandpaper substrate, nano-structured Fe-V electroactive material can be coated on it by facile electrochemical ...
Tópico(s): Electrocatalysts for Energy Conversion
2023 - Multidisciplinary Digital Publishing Institute | Polymers
Min Wu, Daewon Song, Chang Wen Chen,
In this paper, we proposed a multiple description distributed image coding system for mobile wireless transmission. The innovations of proposed system are two folds: First, when MDC is applied to wavelet subband based image coding; it is possible to introduce correlation between the descriptions in each subband. At the encoder, the correlation information is encoded by systematic Reed Solomon (RS) encoder. Only the parity check bits are sent to channel. At the receiver, when part of descriptions ...
Tópico(s): Chaos-based Image/Signal Encryption
2005 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Ngo Trinh Tung, Hoik Lee, Yeari Song, Nguyễn Đức Nghĩa, Daewon Sohn,
Abstract In this study, the effects of dopant content on the structure, especially crystalline structure, and properties of selenious acid doped polyaniline (PAni) were investigated. The structure and properties of PAni were characterized by X-ray diffraction, FTIR spectroscopy, UV–vis spectroscopy, DSC, and TGA. By varying the dopant/monomer molar ratio (D/M), the morphology as well as the crystalline structure of PAni was significantly changed. The presence of water in the crystalline structure ...
Tópico(s): Advanced Sensor and Energy Harvesting Materials
2010 - Elsevier BV | Synthetic Metals
Seohee Chang, Soohyun Kim, Jerome Han, Su-Ji Ha, Hyunho Lee, Seo Woo Song, Daewon Lee, Sunghoon Kwon, Junho Chung, Junhoi Kim,
Phage display is one of the most frequently used platform technologies utilized to screen and select therapeutic antibodies, and has contributed to the development of more than 10 therapeutic antibodies used in the clinic. Despite advantages like efficiency and low cost, it has intrinsic technical limitations, such as the asymmetrical amplification of the library after each round of biopanning, which is regarded as a reason for it yielding a very limited number of antigen binders. In this study, ...
Tópico(s): Nanofabrication and Lithography Techniques
2020 - Multidisciplinary Digital Publishing Institute | Biomolecules
Yeongjae Choi, Hyung Jong Bae, Amos Chungwon Lee, Hansol Choi, Daewon Lee, Taehoon Ryu, Jinwoo Hyun, Seojoo Kim, Hyeli Kim, Suk‐Heung Song, Kibeom Kim, Wook Park, Sunghoon Kwon,
Abstract DNA‐based data storage has attracted attention because of its higher physical density of the data and longer retention time than those of conventional digital data storage. However, previous DNA‐based data storage lacked index features and the data quality of storage after a single access was not preserved, obstructing its industrial use. Here, DNA micro‐disks, QR‐coded micro‐sized disks that harbor data‐encoded DNA molecules for the efficient management of DNA‐based data storage, are proposed. ...
Tópico(s): Modular Robots and Swarm Intelligence
2020 - | Advanced Materials
Younghoon Song, Yunjin Jeong, Taehong Kwon, Daewon Lee, Dong Yoon Oh, Tae-Joon Park, Junhoi Kim, Jiyun Kim, Sunghoon Kwon,
Although droplet microfludics is a promising technology for handling a number of liquids of a single type of analyte, it has limitations in handling thousands of different types of analytes for multiplex assay. Here, we present a novel "liquid-capped encoded microcapsule", which is applicable to various liquid format assays. Various liquid drops can be graphically encoded and arrayed without repeated dispensing processes, evaporation, and the risk of cross-contamination. Millions of nanoliter-scale ...
Tópico(s): 3D Printing in Biomedical Research
2016 - Royal Society of Chemistry | Lab on a Chip
Soontae Kim, Nankyoung Moon, Kyu-Tak Cho, Daewon W. Byun, Eun-Young Song,
BEIS2 (Biogenic Emissions Inventory System version 2) and BEIS3.12 (BEIS version 3.12) were used to estimate hourly biogenic emissions over South Korea using a set of vegetation and meteorological data simulated with the MM5 (Mesoscale Model version 5). Two biogenic emission models utilized different emission factors and showed different responses to solar radiations, resulting in about $10{\sim}20%$ difference in the nationwide isoprene emission estimates. Among the 11-vegetation classes, it was found ...
Tópico(s): Atmospheric Ozone and Climate
2008 - Korean Society for Atmospheric Environment | Journal of Korean Society for Atmospheric Environment
Young‐Ju Song, Kyung-Su Oh, Beom Lee, Daewon Pak, Ji-Hwan Cha, Jun-Gyu Park,
This study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane yield of 334 mL CH4/g volatile solids (VS) at an organic loading rate (OLR) of 4 kg VS/(m3·d). For food waste, the maximum methane yield was 573 mL CH4/g VS at an OLR of 6 kg VS/(m3·d). Livestock manure showed ...
Tópico(s): Wastewater Treatment and Nitrogen Removal
2021 - Multidisciplinary Digital Publishing Institute | Energies
Daewon Lee, Amos Chungwon Lee, Sangkwon Han, Hyung Jong Bae, Seo Woo Song, Yunjin Jeong, Dong Yoon Oh, Seongkyu Cho, Junhoi Kim, Wook Park, Sunghoon Kwon,
Understanding tissue engineering using a bottom-up approach has been hindered by technical limitations because no platform can demonstrate the controlled formation of a heterogeneous population of cells in microscale. Here, we demonstrate hierarchical shape-by-shape assembly of virus-laden particles into larger ones to transfect two different genes on the seeded cells. We show that smaller daughter particles with different sizes and shapes can be assembled into the matching indentations of larger ...
Tópico(s): Cellular Mechanics and Interactions
2018 - American Institute of Physics | Biomicrofluidics
Safee Ullah Chaudhary, Sung‐Young Shin, Daewon Lee, Je-Hoon Song, Kwang‐Hyun Cho,
Abstract Motivation: Computational multiscale models help cancer biologists to study the spatiotemporal dynamics of complex biological systems and to reveal the underlying mechanism of emergent properties. Results: To facilitate the construction of such models, we have developed a next generation modelling platform for cancer systems biology, termed ‘ELECANS’ (electronic cancer system). It is equipped with a graphical user interface-based development environment for multiscale modelling along with ...
Tópico(s): Microtubule and mitosis dynamics
2013 - Oxford University Press | Bioinformatics
Hun-Woong Park, Si‐Youn Song, Tae‐Jin Lee, Daewon Jeong, Taeyoon Lee,
In the present study, we analyzed p16, retinoblastoma (Rb), and cyclin D1 abnormalities in head and neck squamous cell carcinoma (HNSCC) tissues and cell lines from Korean patients. We found a 40% loss of heterozygosity at the D9S171 locus (9p21 region) these tissues. All eight of the HNSCC cell lines did not express the p16 protein, and in two of these cell lines (Amc-HN-6 and 8), this was due to a deletion of the p16 gene. Three of the cell lines (Amc-HN-3 to 5) that expressed the p16 mRNA had the ...
Tópico(s): Cancer Research and Treatments
2007 - Elsevier BV | Oncology Reports
Mingyu Shin, Eunji Chang, Daewon Lee, Nayun Kim, Bumsik Cho, Nuri Cha, Ferdinand Koranteng, Ji‐Joon Song, Jiwon Shim,
Insect respiration has long been thought to be solely dependent on an elaborate tracheal system without assistance from the circulatory system or immune cells
Tópico(s): Aquaculture disease management and microbiota
2024 - Nature Portfolio | Nature
Yeari Song, Hoik Lee, Jaehyoung Ko, Jungju Ryu, Minkyoung Kim, Daewon Sohn,
An anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), was introduced during the ultrasonication process for exfoliation of graphene. The surfactant plays the roles of exfoliator and stabilizer by binding to the graphene surface. The obtained modified graphene was characterized by Fourier-transform infrared spectroscopy (FT-IR) and solid state $^{13}C$ CP/MAS NMR to analyze the binding between molecules, and by X-ray diffraction (XRD) to characterize the bulk structure. The resulting graphene ...
Tópico(s): Carbon Nanotubes in Composites
2014 - Wiley | Bulletin of the Korean Chemical Society
Amos Chungwon Lee, Jessica Svedlund, Evangelia Darai, Yong‐Ju Lee, Daewon Lee, Han‐Byoel Lee, Sung‐Min Kim, Okju Kim, Hyung Jong Bae, Ahyoun Choi, Sumin Lee, Yunjin Jeong, Seo Woo Song, Yeongjae Choi, Huiran Yeom, Caleb S. Lee, Wonshik Han, Dong Soon Lee, Jin‐Young Jang, Narayanan Madaboosi, Mats Nilsson, Sunghoon Kwon,
Liquid biopsy holds promise towards practical implementation of personalized theranostics of cancer. In particular, circulating tumour cells (CTCs) can provide clinically actionable information that can be directly linked to prognosis or therapy decisions. In this study, gene expression patterns and genetic mutations in single CTCs are simultaneously analysed by strategically combining microfluidic technology and in situ molecular profiling technique. Towards this, the development and demonstration ...
Tópico(s): Microfluidic and Bio-sensing Technologies
2020 - Royal Society of Chemistry | Lab on a Chip
Daewon Sohn, Hyung‐Kwan Kim, Myung‐A Kim, Yeong Wook Song, Chung‐Il Noh, Duk‐Kyung Kim, I‐Seok Kang, Hojoong Kim, Sang‐Do Lee, Young‐Hwue Kim, Ho‐Joong Youn, Namsik Chung, Jae Young Choi, Jae‐Bum Jun, Jinho Shin,
Background and Objectives:The purpose of this study was to investigate 1) the beneficial effect of bosentan treatment (125 mg twice daily) on exercise capacity and echocardiographic variables and 2) the profiles and frequency of adverse events in Korean patients with World Health Organization (WHO) class III or IV pulmonary artery hypertension (PAH).Subjects and Methods: Twelve patients who received bosentan treatment were investigated in an open label manner.One patient was excluded in the final analyses ...
Tópico(s): Pulmonary Hypertension Research and Treatments
2009 - Korean Society of Circulation | Korean Circulation Journal
In this paper, we present a novel layered scalable video transmission scheme over multi-input multi-output (MIMO) wireless systems. The proposed layered scalable video transmission scheme is able to adaptively select the MIMO sub-channels for prioritized delivery of layered video signals based on only estimated partial channel state information (CSI). This scheme is fundamentally different from open loop (OL)-MIMO systems such as V-BLAST in which the CSI is only available at the receiver side. Without ...
Tópico(s): Cooperative Communication and Network Coding
2007 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Daewon Song, Chang Wen Chen, Lei Cao,
Multiple description coding (MDC) is a well-known robust data compression algorithm designed to minimize the distortion caused by data loss in packet-based communication systems. Several MDC schemes for transmitting wavelet compressed images have been developed. However, these MDC schemes cannot be adopted for digital mobile wireless applications where both packet loss and bit error are present, because individual description in these MDC schemes usually does not have adequate error resilience capability ...
Tópico(s): Digital Filter Design and Implementation
2004 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Chunsu Ahn, Daewon Song, Jeongmin Noh, Sangyeob Lee,
Tópico(s): Advanced Wireless Network Optimization
2024 - THE KOREAN INSTITUTE OF COMMUNICATIONS AND INFORMATION SCIENCES (KICS) | The Journal of Korean Institute of Communications and Information Sciences
Han-Seok Kim, Jaehoon Choi, Jeongmin Noh, Daewon Song, Sangyeob Lee, Geunbae Kim,
무선랜(WLAN, Wireless Local Area Network)이 서비스되는 ISM(Industrial Scientific Medical)대역은 비면허 대역으로 WLAN 외에도 블루투스, 지그비 등 다양한 신호들이 존재하며 서로 간섭신호로 작용한다. WLAN의 서비스 품질은 이러한 간섭신호들 가운데 동일채널 또는 인접채널에서 동작하는 OBSS (Overlapped Basic Service Set) WLAN 신호에 의해 주로 영향을 받는다. 본 논문에서는 동일채널의 OBSS 간섭신호 영향에 따른 WLAN 서비스 품질을 정량적으로 측정하기 위하여 처리량 효율과 간섭 대응 처리율을 성능지표로 정의하고 이를 기반으로 WLAN 서비스 품질을 측정하기 위한 시험 절차를 제시한다. 또한 이를 상용 WLAN AP(Access Point)의 간섭 영향 평가시험에 적용하고 그 결과를 비교 분석함으로써 제안하는 WLAN 서비스 품질 측정 방법의 유효성을 검증한다. 본 논문에서 제안하는 측정지표 및 ...
Tópico(s): Internet of Things and Social Network Interactions
2023 - THE KOREAN INSTITUTE OF COMMUNICATIONS AND INFORMATION SCIENCES (KICS) | The Journal of Korean Institute of Communications and Information Sciences