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Jeon I.,LG Corp | Sael L.,Incheon | Kang U.,Seoul National University
VLDB Journal | Year: 2016

How can we analyze large-scale real-world data with various attributes? Many real-world data (e.g., network traffic logs, web data, social networks, knowledge bases, and sensor streams) with multiple attributes are represented as multi-dimensional arrays, called tensors. For analyzing a tensor, tensor decompositions are widely used in many data mining applications: detecting malicious attackers in network traffic logs (with source IP, destination IP, port-number, timestamp), finding telemarketers in a phone call history (with sender, receiver, date), and identifying interesting concepts in a knowledge base (with subject, object, relation). However, current tensor decomposition methods do not scale to large and sparse real-world tensors with millions of rows and columns and ‘fibers.’ In this paper, we propose HaTen2, a distributed method for large-scale tensor decompositions that runs on the MapReduce framework. Our careful design and implementation of HaTen2 dramatically reduce the size of intermediate data and the number of jobs leading to achieve high scalability compared with the state-of-the-art method. Thanks to HaTen2, we analyze big real-world sparse tensors that cannot be handled by the current state of the art, and discover hidden concepts. © 2016 Springer-Verlag Berlin Heidelberg

Hyun I.Y.,Incheon | Yun M.-Y.,Inha University
Clinical Nuclear Medicine | Year: 2010

Cutaneous metastases from colorectal adenocarcinoma are rare, and it implies a poor prognosis. Early detection and recognition of the metastatic disease to the skin can dramatically alter the treatment and the prognosis of the disease. We described an unusual case of colorectal cancer with cutaneous metastases. In this case, FDG PET/CT revealed the abnormal focal uptake in a subcutaneous lump on the right abdominal wall 14 months after right hemicolectomy, and it was the sole site of abnormal FDG uptake. Wide excision of abdominal skin was performed. Histopathologic findings were metastatic adenocarcinoma from the colon. © 2010 by Lippincott Williams & Wilkins.

Kahng S.,Incheon | Lee B.,Incheon | Park T.,Daegu Gyeongbuk Institute of Science and Technology
Journal of Electrical Engineering and Technology | Year: 2013

We propose a compact high-order(9th) UHF bandpass filter comprising the composite right-handed and left-handed(CRLH) zeroth-order resonators(ZORs) in the form of the three cascadedtriplets(CTs) newly applied to the ZOR filter which results in very steep skirt. The method is verified by circuit and EM simulations and measurement with metamaterial properties.

Kim K.-J.,HI STEN Co. | Ju H.,Gachon University | Moon Y.-D.,Kyungnam University | Hong J.H.,Incheon | Pak S.J.,HI STEN Co.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2016

The effects of solution annealing and passivation of shell mold cast CF8 stainless steels on Elbow pipe fittings with 2-month room temperature aging have been studied using a corrosion technique. The resistance of corrosion increased with 2-month room temperature aging combined with solid solution annealing and chemical passivation. The mode of corrosion was deeply related to the δ-ferrite content, permeability, and passivation. The corrosion probability decreased as both the δ-ferrite content and the permeability decreased. Therefore, it is considered that δ-ferrite content and passive film of Cr2O3 play an important role in corrosion resistance of CF8 Elbow pipe fittings due to the long-term aging with solid solution annealing and chemical passivation. This result shows that the corrosion resistance of CF8 fittings can be enhanced by the solid solution annealing and chemical passivation. Decreased ferrite phases and permeability improve IGC resistance in CF8 steel. © 2016 The Minerals, Metals & Materials Society and ASM International

Jo Y.-H.,Incheon | Jeon S.-Y.,Incheon | Im J.-H.,Incheon | Lee M.-K.,Incheon
Lecture Notes in Electrical Engineering | Year: 2016

Currently, many smartphones are adopting fingerprint verification as a method to authenticate their users. Because fingerprint verification is not only used to unlock these smartphones but also used in financial applications such as online payment, it is crucial to secure the fingerprint verification mechanism for reliable services. In this paper, we identify a few vulnerabilities in one of the currently deployed smartphones equipped with fingerprint verification service by analyzing the service application. We demonstrate actual attacks via a proof-of-concept code that exploits these vulnerabilities. By these attacks, an attacker can extract fingerprint features by decoding a file containing them in encrypted form. We also suggest a few possible countermeasures against these attacks. © Springer-Verlag Berlin Heidelberg 2016.

Wu J.,Xidian University | Song Z.,Xidian University | Jeon G.,Incheon
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The autoregressive modeling image interpolation scheme is noticeably closer to ideal interpolation aiming at obtaining a high-resolution (HR) image from its low-resolution (LR) version than conventional methods. The basic idea is to first estimate the covariance of HR image from the covariance of the LR image and then adjust the covariance coefficients of HR image according to a feedback mechanism that takes into account the mutual influence between the estimated missing pixels in a local window. In spite of its impressive performance, the time-consuming computation is usually the bottleneck of the method when it is applied in time-critical scenario. Graphics Processing Units (GPUs) are attractive candidates to expedite the computation process. In this paper, an efficient GPU-based massively parallel version of the autoregressive modeling image interpolation scheme was proposed. Because all pixels which need to be interpolated have no dependence, each estimated pixel is assigned to independent thread in our parallel interpolation scheme. Experimental results show that we reached a speedup of 21.2x when I/O transfer time was taken into account, with respect to the original single-threaded C CPU code with the -O2 compiling optimization. © 2013 SPIE.

Sung S.D.,Inha University | Ojha D.P.,Inha University | You J.S.,Inha University | Lee J.,Incheon | And 2 more authors.
Nanoscale | Year: 2015

Single crystalline TiO2 nanoparticles (NPs) with spherical morphology are successfully synthesized by a hydrothermal reaction under basic conditions. TiO2 NPs, selectively controlled to the sizes of 30, 40, 50, and 65 nm, are then applied to a mesoporous photoelectrode of CH3NH3PbI3 perovskite solar cells. In particular, a spherical TiO2 NP of 50 nm size (NP50) offers the highest photovoltaic conversion efficiency (PCE) of 17.19%, with JSC of 21.58 mA cm-2, VOC of 1049 mV, and FF of 0.759 while the enhancement of PCE mainly arises from the increase of VOC and FF. Furthermore, the fabricated photovoltaic devices exhibit reproducible PCE values and very little hysteresis in their J-V curves. Time-resolved photoluminescence measurement and pulsed light-induced transient measurement of the photocurrent indicate that the device employing NP50 exhibits the longest electron lifetime although the electron injection from perovskite to TiO2 is less efficient than the devices with smaller TiO2 NPs. The extended electron lifetime is attributed to the suppression of electron recombination due to optimized mesopores generated by the spherical NP50. This journal is © The Royal Society of Chemistry.

Irradiation can cause salivary gland hypofunction, with hyposalivation producing discomfort, health risks, and reducing function in daily life. Despite increasing translational research interest in radioprotection, there are no satisfactory treatments available. Keratinocyte growth factor-1 stimulates proliferation of salivary epithelial cells or salivary stem/progenitor cells. However, the exact mechanism of its radioprotection against radiation-induced salivary hypofunction is not fully elucidated. Our results reveal that the radioprotective effects of keratinocyte growth factor-1 involved alleviation of growth inhibition and anti-apoptotic cell death of human parotid epithelial cells. Furthermore, keratinocyte growth factor-1 protected human parotid epithelial cells through the phosphoinositide 3-kinase - protein kinase B (Akt) pathway and inhibition of p53-mediated apoptosis through activation of mouse double minute 2. Local delivery of keratinocyte growth factor-1 into the irradiated salivary glands could protect radiation-induced salivary cell damages, suppress p53-mediated apoptosis and prevent salivary hypofunction in vivo. This suggests that keratinocyte growth factor-1 is a promising candidate to prevent radiation-induced salivary hypofunction and raise rational development keratinocyte growth factor-1 local delivery system.

PubMed | Inje University, Inha University and Incheon
Type: Review | Journal: Journal of clinical neurology (Seoul, Korea) | Year: 2016

No disease-modifying therapies (DMT) for neurodegenerative diseases (NDs) have been established, particularly for Alzheimers disease (AD) and Parkinsons disease (PD). It is unclear why candidate drugs that successfully demonstrate therapeutic effects in animal models fail to show disease-modifying effects in clinical trials. To overcome this hurdle, patients with homogeneous pathologies should be detected as early as possible. The early detection of AD patients using sufficiently tested biomarkers could demonstrate the potential usefulness of combining biomarkers with clinical measures as a diagnostic tool. Cerebrospinal fluid (CSF) biomarkers for NDs are being incorporated in clinical trials designed with the aim of detecting patients earlier, evaluating target engagement, collecting homogeneous patients, facilitating prevention trials, and testing the potential of surrogate markers relative to clinical measures. In this review we summarize the latest information on CSF biomarkers in NDs, particularly AD and PD, and their use in clinical trials. The large number of issues related to CSF biomarker measurements and applications has resulted in relatively few clinical trials on CSF biomarkers being conducted. However, the available CSF biomarker data obtained in clinical trials support the advantages of incorporating CSF biomarkers in clinical trials, even though the data have mostly been obtained in AD trials. We describe the current issues with and ongoing efforts for the use of CSF biomarkers in clinical trials and the plans to harness CSF biomarkers for the development of DMT and clinical routines. This effort requires nationwide, global, and multidisciplinary efforts in academia, industry, and regulatory agencies to facilitate a new era.

PubMed | Korea University, Inha University and Incheon
Type: Journal Article | Journal: Malaria journal | Year: 2017

Although severe malaria by Plasmodium vivax has been increasingly reported, there are marked variations in the type and rate of the complications by geographic area. This is possibly because of the presence of concurrent falciparum malaria or bacteraemia, and of differences in underlying immune status among the infected subjects. Furthermore, published studies on P. vivax in temperate regions are limited. The present study investigated severe vivax malaria in Korea, where only vivax malaria occurs. Hence, other compounding factors are rare. Additionally, most of the patients are possibly non-immune to this malarial disease.Adults with vivax malaria observed in one 860-bed university hospital from January 2006 to December 2012 were retrospectively evaluated. Seventeen patients who had travelled overseas within 6months before the presentation of malaria were excluded. Severe vivax malaria was diagnosed according to World Health Organization criteria. Other complications were also investigated.Two-hundred and ten patients were enrolled, of which 88 (41.9%) were treated as inpatients and the remainder as outpatients. Eleven patients were treated in an intensive care unit; among them, five patients received mechanical ventilation, and one needed extracorporeal membrane oxygenation therapy (ECMO) additionally. Severe vivax malaria was identified in 44 patients (21.0%), and the most common severe complication was pulmonary manifestation (40/188, 21.9%), which was followed by cerebral malaria (5/210, 2.4%), shock (4/210, 1.9%), spontaneous bleeding (3/210, 1.4%), metabolic acidosis (3/210, 3.5%) and acute kidney injury (2/210, 1.0%). Unusual complications, such as splenic infarction (ten patients) and retinal haemorrhage (two patients) were sometimes observed. There were no deaths, but the case involving ECMO was potentially fatal.Plasmodium vivax infection can be severe to be fatal and is frequently associated with various complications in non-immune adults. The frequency of each complication seems to differ from other countries. Hence, further investigation is needed to elucidate the causes and mechanisms responsible for these differences.

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