Daegu, South Korea
Daegu, South Korea

Daegu University is a private university in South Korea. Its campus is located a short distance outside Daegu, in Gyeongsan City, North Gyeongsang province. The school currently consists of 13 colleges from college of humanities to college of rehabilitation. The current president is Dr. Hong Duk Yul. Enrollment currently tops 20,000, and more than 780 professors are employed. Wikipedia.

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Daegu University, Myongji University, Korea Institute of Science, Technology and Keimyung University | Date: 2014-08-26

Disclosed herein is a bioenergy production system with reduced carbon dioxide emissions and process wastes; including a process for producing a bioalcohol and a biogas by subjecting a biomass, such as: herbaceous and woody plants, fruit pulp, freshwater and sea algae, grains, aerobic and anaerobic sludge, saccharides, polyols and carbohydrates, to a combined process of a biosaccharification/alcohol fermentation, including a biomass pretreatment process; and a process for producing a methane biogas with a reduced level of carbon dioxide and hydrogen sulfide, via an algae cultivation process with a view to purifying the carbon dioxide and hydrogen sulfide contained in the biogas; wherein, when the algae to be cultivated is microalgae, biodiesel is produced by subjecting the harvested microalgae to a biodiesel manufacturing process while recycling the glycerol and the saccharide-containing waste produced as byproducts to the biosaccharification/alcohol fermentation process, and when the algae to be cultivated is macroalgae the harvested macroalgae is recycled to the biosaccharification/alcohol fermentation process. The method of the present invention is effective in reducing carbon dioxide emissions, a representative green house gas contributing to the global warming, and also in optimizing a zero-waste bioenergy production system.

Lattimer J.M.,State University of New York at Stony Brook | Lim Y.,Daegu University
Astrophysical Journal | Year: 2013

One of the major uncertainties in the dense matter equation of state has been the nuclear symmetry energy. The density dependence of the symmetry energy is important in nuclear astrophysics, as it controls the neutronization of matter in core-collapse supernovae, the radii of neutron stars and the thicknesses of their crusts, the rate of cooling of neutron stars, and the properties of nuclei involved in r-process nucleosynthesis. We show that fits of nuclear masses to experimental masses, combined with other experimental information from neutron skins, heavy ion collisions, giant dipole resonances, and dipole polarizabilities, lead to stringent constraints on parameters that describe the symmetry energy near the nuclear saturation density. These constraints are remarkably consistent with inferences from theoretical calculations of pure neutron matter, and, furthermore, with astrophysical observations of neutron stars. The concordance of experimental, theoretical, and observational analyses suggests that the symmetry parameters Sv and L are in the range 29.0-32.7 MeV and 40.5-61.9 MeV, respectively, and that the neutron star radius, for a 1.4 M⊙ star, is in the narrow window 10.7 km

Kwak S.,Daegu University
IEEE Transactions on Industrial Electronics | Year: 2010

In the last 30 years, industrial and academic research work has matured plasma display panels (PDPs) to the successful product level for commercial flat-screen television sets. Along with the development of panel manufacturing technology, recent advances in the development of electronic circuitry drivers have paved the way for achieving better performance, higher efficiency, and lower cost. A substantial number of notable driver topologies have been developed; however, most of the presented works have been focused on their own topology and operational principles without giving overall impressions related with other works. This paper is an attempt to provide insights into these diverse drivers of the PDPs by presenting an overview of the topologies. The driver configurations are classified based on the resonant energy source, the connecting type of resonant networks, and the number of levels of panel voltage. Selected drivers in each class are analyzed, and key structural characteristics are identified. Issues related to the practical implementation are also discussed. © 2006 IEEE.

Chang J.H.,Daegu University
Knowledge-Based Systems | Year: 2011

Sequential pattern mining, including weighted sequential pattern mining, has been attracting much attention since it is one of the essential data mining tasks with broad applications. The weighted sequential pattern mining aims to find more interesting sequential patterns, considering the different significance of each data element in a sequence database. In the conventional weighted sequential pattern mining, usually pre-assigned weights of data elements are used to get the importance, which are derived from their quantitative information and their importance in real world application domains. In general sequential pattern mining, the generation order of data elements is considered to find sequential patterns. However, their generation times and time-intervals are also important in real world application domains. Therefore, time-interval information of data elements can be helpful in finding more interesting sequential patterns. This paper presents a new framework for finding time-interval weighted sequential (TiWS) patterns in a sequence database and time-interval weighted support (TiW-support) to find the TiWS patterns. In addition, a new method of mining TiWS patterns in a sequence database is also presented. In the proposed framework of TiWS pattern mining, the weight of each sequence in a sequence database is first obtained from the time-intervals of elements in the sequence, and subsequently TiWS patterns are found considering the weight. A series of evaluation results shows that TIWS pattern mining is efficient and helpful in finding more interesting sequential patterns. © 2010 Elsevier B.V. All rights reserved.

The aim of this study was to provide the first, comprehensive meta-analysis of the neuroimaging literature regarding greater neural responses to a deviant stimulus in a stream of repeated, standard stimuli, termed here oddball effects. The meta-analysis of 75 independent studies included a comparison of auditory and visual oddball effects and task-relevant and task-irrelevant oddball effects. The results were interpreted with reference to the model in which a large-scale dorsal frontoparietal network embodies a mechanism for orienting attention to the environment, whereas a large-scale ventral frontoparietal network supports the detection of salient, environmental changes. The meta-analysis yielded three main sets of findings. First, ventral network regions were strongly associated with oddball effects and largely common to auditory and visual modalities, indicating a supramodal "alerting" system. Most ventral network components were more strongly associated with task-relevant than task-irrelevant oddball effects, indicating a dynamic interplay of stimulus saliency and internal goals in stimulus-driven engagement of the network. Second, the bilateral inferior frontal junction, an anterior core of the dorsal network, was strongly associated with oddball effects, suggesting a central role in top-down attentional control. However, other dorsal network regions showed no or only modest association with oddball effects, likely reflecting active engagement during both oddball and standard stimulus processing. Finally, prominent oddball effects outside the two networks included the sensory cortex regions, likely reflecting attentive and preattentive modulation of early sensory activity, and subcortical regions involving the putamen, thalamus, and other areas, likely reflecting subcortical involvement in alerting responses. © 2013 Wiley Periodicals, Inc.

Yun J.W.,Daegu University
Phytochemistry | Year: 2010

Obesity is associated with many diseases, particularly diabetes, hypertension, osteoarthritis, and heart disease. The obesity incidence has increased at an alarming rate in recent years, becoming a worldwide health problem, with incalculable social costs. Two different obesity-treatment drugs are currently on the market: orlistat, which reduces intestinal fat absorption via inhibiting pancreatic lipase; and sibutramine, an anorectic or appetite suppressant. Both drugs have hazardous side-effects, including increased blood pressure, dry mouth, constipation, headache, and insomnia. For this reason, a wide variety of natural materials have been explored for their obesity treatment potential. These are mainly complex products having several components with different chemical and pharmacological features. This review aimed to survey the literature covering natural products with anti-obesity activity and to review the scientific data, including experimental methodologies, active components, and mechanisms of action against obesity. © 2010 Elsevier Ltd. All rights reserved.

Kwak S.,Daegu University
IEEE Transactions on Power Electronics | Year: 2010

This paper proposes a fault-tolerant matrix converter with reconfigurable structure and modified switch control schemes, along with a fault diagnosis technique for open-circuited switch failures. The proposed fault recognition method can detect and locate a failed bidirectional switch with voltage error signals dedicated to each switch, based on a direct comparison of the input and the output voltages. Following the fault detection, the designed converter architecture isolates the faulty parts and bypasses the remaining load phase, resulting in a 3 × 2 matrix configuration with six bidirectional switches. Based on the reconfigured hardware topology, novel fault-tolerant modulation strategies are developed to produce three-phase balanced sinusoidal output voltages/currents with only six bidirectional switches, but at a reduced output voltage magnitude as compared with the normal matrix converter. Thus, the developed switching function matrices for the reconfigurable converter structure, containing an appropriate positive-and negative-sequence set of matrices with input voltage vector, can preserve continuous operation even after switch failures and improve reliability of the drives. © 2006 IEEE.

The encoding of sensory input is intertwined with external attention, whereas retrieval is intrinsically related to internal attention. This study proposes a model in which the encoding of sensory input involves mainly the anterior hippocampus and the external attention network, whereas retrieval, the posterior hippocampus and the internal attention network. This model is referred to as the HERNET (hippocampal encoding/retrieval and network) model. Functional neuroimaging studies have identified two intrinsic large-scale networks closely associated with external and internal attention, respectively. The dorsal attention network activates during any externally oriented mental activity, whereas the default mode network shows increased activity during internally oriented mental activity. Therefore, the HERNET model may predict the activation of the anterior hippocampus and the dorsal attention network during the encoding and activation of the posterior hippocampus and the default mode network during retrieval. To test this prediction, this study provides a meta-analysis of three memory-imaging paradigms: subsequent memory, laboratory-based recollection, and autobiographical memory retrieval. The meta-analysis included 167 individual studies and 2,856 participants. The results provide support for the HERNET model and suggest that the anterior-posterior gradient of encoding and retrieval includes amygdala regions. More broadly, humans continuously oscillate between external and internal attention and thus between encoding and retrieval processes. These oscillations may involve repetitive and spontaneous activity switching between the anterior hippocampus/dorsal attention network and the posterior hippocampus/default mode network. © 2014 Wiley Periodicals, Inc.

This study presents a meta-analysis comparing hit and correct rejection (CR) conditions across 48 fMRI studies. Old/new (hit > CR) effects associated most consistently with (1) components of the default-mode network, including the left angular gyrus, bilateral precuneus, and bilateral posterior cingulate regions, which may support the mental re-experiencing of an old event, or ecphory; (2) components of the cognitive-control network, involving the left dorsolateral and dorsomedial prefrontal cortex and bilateral intraparietal sulcus regions, which may mediate memory and non-memory control functions; and (3) the caudate nucleus, a key part of the brain's reward system that may support the satisfaction tied to target-detection. Direct comparisons of old/new effects between item versus source retrieval and "remember" versus "know" retrieval yielded three main sets of findings. First, default-mode network regions showed greater old/new effects in conditions associated with richer ecphoric processing. Second, cognitive-control network regions showed greater old/new effects in conditions associated with a greater demand for strategic-retrieval processing. Third, the caudate nucleus showed greater old/new effects in conditions tied to greater confidence in target-detection. New/old (CR > hit) effects most strongly associated with the bilateral medial temporal lobe, possibly reflecting greater encoding-related activity for new than for old items, and the right posterior middle temporal regions, possibly reflecting repetition-related neural priming for old items. In conclusion, neural activity distinguishing old from new events comprises an ensemble of multiple memory-specific activities, including encoding, retrieval, and priming, as well as multiple types of more general cognitive activities, including default-mode, cognitive-control, and reward processing. Hum Brain Mapp, 2013. © 2011 Wiley Periodicals, Inc. Copyright © 2011 Wiley Periodicals, Inc..

The present invention is about preparing gelatin nanoparticles having a size of about 200 nm are supported or not supported with a hardly-water soluble drug without a homogenizer by constructing O/W/O or W/O systems, thereby relatively prolonging the circulation time within the human body as compared to a water-repellent particle because it is free from the immune system, and enhancing EPR (Enhanced permeability and retention) effects. In this case, the hardly-water soluble drug includes hardly soluble anticancer agents such as paclitaxel, coenzyme Q10, ursodexoychlic acid, ilaprazole or imatinib mesylate. Furthermore, the O/W/O or W/O systems are nonpolar phase/polar phase/nonvolatile nonpolar phase and polar phase/nonvolatile nonpolar phase systems, respectively. More specifically, the O/W/O or W/O systems presents a hardly soluble drug/gelatin nanoparticle/fatty acid and gelatin nanoparticle/fatty acid systems, respectively.

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