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Search Results: 1 - 10 of 1906 matches for " Suk-Keun Cha "
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A Study on Effective System for Harbor Container Delivery & Cargo Work Automatuion  [PDF]
Dong-Hoon Kim, Jun-Yeob Song, Seung-Ho Lee, Il-Yong Kang, Suk-Keun Cha
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.28074
Abstract: In this article, we have attempted to analyze current situation and the problem of domestic and overseas harbor container delivery & cargo work automation centered on major harbors and to suggest effective way to deal with the issue in order to improve the productivity of container cargo work per crane, the major index of productivity of high value-added shipbuilding industry. In particular, we have suggested the way to realize effective automation system that can improve the efficiency of harbor container delivery & cargo work through the development of high-tech measuring automation technology using microwave radar and applied design that have broken away from traditional automation system and traditional problems such as dependence on manual work and the problem of laser method in which workers cannot identify laser beam under sunlight and workers’ eyesight can be weakened by being exposed to laser beam.
An Auto-Configuration of 4M Group Management Using Wireless Sensor Networks  [PDF]
Suk-Keun Cha, Jeong-Hoon Lee, Han Gyu Kim, Joon Jae Yoo, Jung Hoon Kang, Dong Hoon Kim, Jun Yeob Song
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.24052
Abstract: The first tier of automotive manufacturers has faced to pressures about move, modify, updating tasks for manufacturing resources in production processes from demand response of production order sequence for motor company and process innovation purpose for productivity. For meets this requirements, it has to require absolutely lead time to re-wiring of physical interface for production equipment, needs for change existing program and test over again. For prepare this constraints, it needs studying an auto-configuration functions that build for both visibility and flexibility based on the 4M (Man, Machine, Material, Method) group management which is supports from WSN (Wireless Sensor Network) of the open embedded device called M2M (Machine to Machine) and major functions of middleware including point manager for real-time device communication, real-time data management, Standard API (Application Program Interface) and application template management. To be application system to RMS (Reconfigurable Manufacturing System) for rapidly response from various orders and model from motor company that is beginning to establishing the mapping of manufacturing resources of 4M using WSN.
Real-Time Compensation of Chatter Vibration in Machine Tools
Dong-Hoon Kim,Jun-Yeob Song,Suk-Keun Cha,Han-kyu Kim
International Journal of Intelligent Systems and Applications , 2013, DOI: 10.5815/ijisa.2013.06.04
Abstract: The chatter vibration stands for a sudden relative vibration appeared between a material and a tool while processing with a machine. This vibration is a factor that seriously affects the quality of processed materials as well as being a factor which causes serious damages to the tool and the machine. This study is related to the detection and compensation of chatter vibration that can compensate chatter vibration faster and produce processed goods with more precision by autonomous compensation. The above-mentioned chatter vibration compensator includes the chatter vibration sensor and the chatter compensator that estimates the compensation value according to the sensor detecting the chatter vibration of machine tool and the chatter vibration detected from the sensor while having a feature of being organized by interlocking with the machine tool controller.
Differential regulation of iron chelator-induced IL-8 synthesis via MAP kinase and NF-κB in immortalized and malignant oral keratinocytes
Hwa-Jeong Lee, Jun Lee, Sun-Kyung Lee, Suk-Keun Lee, Eun-Cheol Kim
BMC Cancer , 2007, DOI: 10.1186/1471-2407-7-176
Abstract: IL-8 production was measured by an enzyme-linked immunoabsorbent assay and reverse transcriptase-polymerase chain reaction (RT-PCR) analysis. Electrophoretic mobility shift assays was used to determine NF-κB binding activity. Phosphorylation and degradation of the I-κB were analyized by Western blot.IHOK cells incubated with DFO showed increased expression of IL-8 mRNA, as well as higher release of the IL-8 protein. The up-regulation of DFO-induced IL-8 expression was higher in IHOK cells than in HN12 cells and was concentration-dependent. DFO acted additively with IL-1β to strongly up-regulate IL-8 in IHOK cells but not in HN12 cells. Accordingly, selective p38 and ERK1/2 inhibitors for both kinases abolished DFO-induced IL-8 expression in both IHOK and HN12 cells. Furthermore, DFO induced the degradation and phosphorylation of IκB, and activation of NF-κB. The IL-8 inducing effects of DFO were mediated by a nitric oxide donor (S-nitrosoglutathione), and by pyrrolidine dithiocarbamate, an inhibitor of NF-κB, as well as by wortmannin, which inhibits the phosphatidylinositol 3-kinase-dependent activation of NAD(P)H oxidase.This results demonstrate that DFO-induced IL-8 acts via multiple signaling pathways in immortalized and malignant oral keratinocytes, and that the control of IL-8 may be an important target for immunotheraphy against human oral premalignant lesions.Approximately 40,000 cases of cancer of the mouth and pharynx are reported annually in the United States, and it is the sixth most common cancer type worldwide. Over 90% of oral-pharyngeal cancers are squamous cell carcinomas (SCC). The 5-year survival rate for this type of cancer is approximately 50% and has not markedly improved in the past 30 years [1,2]. Several chemotherapy regimes have been clinically applied to treat oral-pharyngeal cancers, but none have shown to significantly improve prognoses [3,4]. Thus, a safe and effective anticancer target is needed to treat oral cancer.Iron is a critical n
SUrvey of Guideline Adherence for Treatment of Systolic Heart Failure in Real World (SUGAR): A Multi-Center, Retrospective, Observational Study
Byung-Su Yoo, Jaewon Oh, Bum-Kee Hong, Dae-Hee Shin, Jang-Ho Bae, Dong Heon Yang, Wan-Joo Shim, Hyung-seop Kim, Su-Hong Kim, Jin-Oh Choi, Woo-Jung Chun, Choong-Won Go, Hyun-Jae Kang, Sang Hong Baek, Jang-hyun Cho, Suk-Keun Hong, Joon-Han Shin, Seok-Kyu Oh, Wook-Bum Pyun, Jun Kwan, Young-Joon Hong, Jin-Ok Jeong, Seok-Min Kang, Dong-Ju Choi, on behalf of the SUGAR Study
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086596
Abstract: Background Clinical practice guidelines have been slowly and inconsistently applied in clinical practice, and certain evidence-based, guideline-driven therapies for heart failure (HF) have been significantly underused. The purpose of this study was to survey guideline compliance and its effect on clinical outcomes in the treatment of systolic HF in Korea. Method and Results The SUrvey of Guideline Adherence for Treatment of Systolic Heart Failure in Real World (SUGAR) trial was a multi-center, retrospective, observational study on subjects with systolic HF (ejection fraction <45%) admitted to 23 university hospitals. The guideline adherence indicator (GAI) was defined as a performance measure on the basis of 3 pharmacological classes: angiotensin-converting enzyme inhibitor (ACEI) or angiotensin receptor II blocker (ARB), beta-blocker (BB), and aldosterone antagonist (AA). Based on the overall adherence percentage, subjects were divided into 2 groups: those with good guideline adherence (GAI ≥50%) and poor guideline adherence (GAI <50%). We included 1319 regional participants as representatives of the standard population from the Korean national census in 2008. Adherence to drugs at discharge was as follows: ACEI or ARB, 89.7%; BB, 69.2%; and AA, 65.9%. Overall, 82.7% of the patients had good guideline adherence. Overall mortality and re-hospitalization rates at 1 year were 6.2% and 37.4%, respectively. Survival analysis by log-rank test showed a significant difference in event-free survival rate of mortality (94.7% vs. 89.8%, p = 0.003) and re-hospitalization (62.3% vs. 56.4%, p = 0.041) between the good and poor guideline-adherence groups. Conclusions Among patients with systolic HF in Korea, adherence to pharmacologic treatment guidelines as determined by performance measures, including prescription of ACEI/ARB and BB at discharge, was associated with improved clinical outcomes.
The Archaea Community Associated with Lava-Formed Gotjawal Forest Soil in Jeju, Korea  [PDF]
Jong-Shik Kim, Man-Young Jung, Keun Chul Lee, Dae-Shin Kim, Suk-Hyung Ko, Jung-Sook Lee, Sung-Keun Rhee
Journal of Agricultural Chemistry and Environment (JACEN) , 2014, DOI: 10.4236/jacen.2014.33012
Abstract: The abundance and diversity of archaeal assemblages were analyzed in soils collected from Gyorae Gotjawal forest, Jeju, Korea. Gotjawal soil refers to soil derived from a lava-formed forest, characterized by high organic matter content, fertility, and poor rocky soil. Using domain-specific primers, archaeal 16S rRNA gene sequences were PCR amplified for clone library construction, and a total of 185 archaeal clones were examined. The archaeal clones were affiliated with the phyla Thaumarchaeota (96.2%) and Euryarchaeota (3.8%). The most abundant thaumarchaeal group (90.3% of the clones) was the group I.1b clade, which includes soil ammonia-oxidizing archaea. The unique characteristics of Gotjawal soil, including basalt morphology, vegetation, and groundwater aquifer penetration, may be reflected in the archaeal community composition. Further study is necessary to understand the unique factors of Gotjawal soils that influence archaeal abundance, composition, and diversity.
Functional Analysis for Rolling Leaf of Somaclonal Mutants in Rice (Oryza sativa L.)  [PDF]
Young-Hie Park, Hyun-Suk Lee, Gi-Hwan Yi, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.21008
Abstract: This study was carried out to facilitate the functional analysis of rice genes. Some 297 insertion plants (1.7%) of the entire lines with the endogenous retrotransposon Tos17 were produced. Phenotypes of these plants in the S2 genera-tion were observed in the field according to different leaf types. Rolling leaf mutants showed thinner sclerenchyma-tous cells, defective arrangement of vascular bundles, and well-formed bulliform cells as compared to the parental cultivar. Two new copies of Tos17 were detected in the rolling leaf type. In the new leaf type, the copy number and activation of Tos12, 15 did not appear as ‘Ilpum’. Flanking sequence tag (FST) analysis of Tos17 in the rolling leaf mutant indicated that new copies of Tos17 were transposed on chromosomes 11 and 12. Annotated homologues of the tagging genes on chromosome 11 were arabinoxylan rabinofuranohydrolase isoenzyme AXAH-I and II. The tagging gene in chromosome 12 was highly correlated with 6 kinds of genes including a transcript regulated factor and a rough sheath 2-like protein. This rolling leaf and flanking sequence data will stimulate the functional analysis of rice genes.
High Frequency Sporophytes Regeneration from the Spore Culture of the Endangered Aquatic Fern Isoetes coreana  [PDF]
Myung Jin Oh, Changkyun Kim, Hye Ryun Na, Hyunchur Shin, Jang R. Liu, Hong-Keun Choi, Suk Weon Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.46A003

Using a mixed culture of megaspores and microspores from I. coreana, we established high frequency sporophyte regeneration system. After 20 days of culturing in MS basal medium, microscopic examination showed significant morphological changes and the microspore released numerous small vesicles into the culture medium. Megaspores also showed dramatic morphological changes during its incubation time in culture. The spore wall was cracked by the expansion of the megaspore (about 2 times increase in diameter). Simultaneously, brown spots were observed on the surface of the megaspores. The frequency of female gametophytes developing from immature megaspores cultured in MS basal liquid medium (pH 7) supplemented with 1 mgl-1 GA3 was 46%. However, these female gametophytes derived from megaspore only culture could not differentiate into sporophytes. The mixed culture of microspores and megaspores resulted in successful sporophyte regeneration. The highest frequency (12.3%) of green sporophyte regeneration from mixed spore culture occurred when the cultures were maintained at 25℃ under cool-white fluorescent light (40 μmol·m-2·s-1) with a 16 h photoperiod. Regenerated sporophytes were transferred to a test tube containing vermiculite and a sand mixture and left there until they had three leaves. After root growth and the fifth leaf had emerged, more than 95% of the regenerated sporophytes were successfully transferred to the soil and grown to mature plants. The sporophyte regeneration system established in this study could be successfully used for the restoration of the endangered aquatic species, I.

Characterization of Metal Artifacts in X-ray Computed Tomography
Hyoung Suk Park,Jae Kyu Choi,Jin Keun Seo
Mathematics , 2014,
Abstract: Metal streak artifacts in X-ray computerized tomography (CT) are rigorously characterized here using the notion of the wavefront set from microlocal analysis. The metal artifacts are caused mainly from the mismatch of the forward model of the filtered back-projection; the presence of metallic subjects in an imaging subject violates the model's assumption of the CT sinogram data being the Radon transform of an image. The increasing use of metallic implants has increased demand for the reduction of metal artifacts in the field of dental and medical radiography. However, it is a challenging issue due to the serious difficulties in analyzing the X-ray data, which depends nonlinearly on the distribution of the metallic subject. In this paper, we found that the metal streaking artifacts cause mainly from the boundary geometry of the metal region. The metal streaking artifacts are produced only when the wavefront set of the Radon transform of the characteristic function of a metal region does not contain the wavefront set of the square of the Radon transform. We also found a sufficient condition for the non-existence of the metal streak artifacts.
Hydrogen magnetic reaction gene regulation
Yeon Sook Kim,Dae Gwan Lee,Suk Keun Lee
Quantitative Biology , 2012,
Abstract: A new gene regulation system using weak magnetic field can induce the hydrogen magnetic reaction (HMR) in hydrogen atoms, and subsequently affect the electrostatic polarity of hydrogen bonds in DNA base pairs. The HMR can sequentially activate the DNA base pair polarities of target DNA. With the characteristic base pair polarities of DNA duplex the (pyrimidine)m-(purine)n DNA segment is a basic unit to maintain and to accumulate the electrostatic energy of DNA duplex (1). To enhance the polarities of objective DNA this HMR gene regulation (HMR-GR) uses the polarized magnetic field with optimal nucleotide exposure time for T:A and C:G base pairs (50 msec and 80 msec, respectively). The targeting efficiency of HMR-GR to the objective DNA is theoretically up to 25%. In the present study, the HMR-GR expanded the conformation of oligo-dsDNA in vitro, implicating the active state of DNA, and also enhanced the restriction endonuclease digestion, in vitro RNA transcription, and the production of green fluorescence protein and {\beta}-galactosidase by using each RE site sequence and relevant promoter sequence, respectively. Taken together, it is assumed that the HMR-GR is an effective and safe method to control the multiple genes sequentially by activating their specific DNA motifs.
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