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Search Results: 1 - 10 of 50429 matches for " Jin-Young Kim "
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Stability Enhancement in HVDC System with STATCOM  [PDF]
Chan-Ki Kim, Jin-Young Kim, Sung-Doo Lee, Eung-Bo Sim
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.311133
Abstract: This paper deals with the stability problem at the inverter end of a HVDC link with STATCOM (Static Compensator), when connected to a weak AC system which has the stability enhancement for power instability and commutation failures. The HVDC stability problem is tackled with a STATCOM which not only provides a rapid recovery from power, harmonic stability and commutation failures but also offers a lower cost filter design for the HVDC system. PSCAD/EMTDC simulations are presented to demonstrate the robust performance and to validate the proposed topology.
Novel Image Contrast Enhancement for SoC of Small Mobile Display
JIN-YOUNG CHUNG,KI-DOO KIM
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: Recently,the mobile phone has emerged as a leading icon of the convergence of consumer electronics. A wide varietyof mobile phone applications such as DMB (digital multimedia broadcasting), digital photography, video telephony, and fullinternet browsing are now available to consumers. To meet the demands of these applications, image quality has becomeincreasingly important. Furthermore, touch windowsare popular on mobile display panels,but they cause contrast loss becauseofthe low transmittance of ITO film. This paper presents an image contrast enhancement algorithm to be embedded on aSoC.Aclipped histogram stretching (CHS) method is proposed here to enable the algorithm to adapt to the input images, while an S-shaped curve algorithm and a gain/offset method are proposed for static applications. Finally, the performance of the proposedalgorithm is evaluated using histograms, RGB pixel distributions, entropy values, and dynamic range values of the resultingimages.
Selection of Health Care Workers for Screening for Latent Tuberculosis Infection  [PDF]
Jin Young Lee, Ji Young Park, Myung Shin Kim, Je Hun Kim, Jin-Young Lee
Journal of Tuberculosis Research (JTR) , 2019, DOI: 10.4236/jtr.2019.72007
Abstract: Introduction: The rate of latent tuberculosis infections (LTBIs) in health care workers (HCWs) is higher than that in non-HCWs. We studied to investigate the prevalence and risk factors of LTBIs and the acceptance rate for treatment of LTBI among HCWs in South Korea, a country with an intermediate tuberculosis (TB) burden. Methodology: LTBI screening was conducted for HCWs at a tertiary and a secondary hospital from April 2017 to August 2017. This was a retrospective study included all HCWs who underwent LTBI examination. HCWs were classified by the degree of risk into four groups, based on two factors: possibility of exposure to TB, and impact on patients at the time of TB onset in the HCWs. The interferon-gamma release assay was used for the diagnosis of LTBI. Results: A total of 1326 HCWs were included; they comprised 801 HCWs from a tertiary hospital and 525 from a secondary hospital. A total of 235 (17.7%) HCWs were diagnosed with LTBIs. According to risk classification, there was no significant difference (P = 0.24). In multivariate analysis, age was the only independent risk factor (P < 0.001). The acceptance rate for LTBI treatment was 60.43%, and there were no associated factors in multivariate analysis. Conclusions: HCWs did not show any significant difference in the rate of LTBI by the degree of risk, and age was the independent risk factor. LTBI screening should be conducted for all HCWs regardless of risk classification.
Increased Expression of Neurotrophin 4 Following Focal Cerebral Ischemia in Adult Rat Brain with Treadmill Exercise
Jin-Young Chung, Min-Wook Kim, Moon-Suk Bang, Manho Kim
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0052461
Abstract: Neurotrophin 4 (NT-4) belongs to the family of neurotrophic factors, and it interacts with the tyrosine kinase B (trkB) receptor. NT-4 has neuroprotective effects following cerebral ischemia. Its role might be similar to brain-derived neurotrophic factor (BDNF), because both interact with trkB. Exercise also improves neural function by increasing neurotrophic factors. However, expression profiles of NT-4 in the brain during exercise are unknown. Here, we assessed the expressions of NT-4 and its receptor, trkB, following cerebral ischemia and hypothesized that exercise changes the expressions of NT-4 and trkB. Results showed that in a permanent middle cerebral artery occlusion rat model, ischemia decreased NT-4 and trkB expression. Immunohistochemistry showed their immunoreactivities around the region of the ischemic area. Treadmill exercise changed the expression of NT-4, which increased in the contralateral hemisphere in rats with ischemic injury. TrkB also showed similar patterns to its neurotophins. The change in NT-4 suggested that exercise might have primed NT4 production so that further injury causes slightly greater increases in NT4 compared with non-exercise controls.
Formal Implementation of a Performance Evaluation Model for the Face Recognition System
Yong-Nyuo Shin,Jason Kim,Yong-Jun Lee,Woochang Shin,Jin-Young Choi
Journal of Biomedicine and Biotechnology , 2008, DOI: 10.1155/2008/742504
Abstract: Due to usability features, practical applications, and its lack of intrusiveness, face recognition technology, based on information, derived from individuals' facial features, has been attracting considerable attention recently. Reported recognition rates of commercialized face recognition systems cannot be admitted as official recognition rates, as they are based on assumptions that are beneficial to the specific system and face database. Therefore, performance evaluation methods and tools are necessary to objectively measure the accuracy and performance of any face recognition system. In this paper, we propose and formalize a performance evaluation model for the biometric recognition system, implementing an evaluation tool for face recognition systems based on the proposed model. Furthermore, we performed evaluations objectively by providing guidelines for the design and implementation of a performance evaluation system, formalizing the performance test process.
A case of gangliocytic paraganglioma in the ampulla of Vater
Junsik Kwon, Seung Lee, Mee Kang, Jin-Young Jang, Sun-Whe Kim
World Journal of Surgical Oncology , 2010, DOI: 10.1186/1477-7819-8-42
Abstract: The authors report a case of gangliocytic paraganglioma verified by post-op pathology after pancreaticoduodenectomy for a tumor in the ampulla of Vater. The 56-year-old male patient concerned visited our emergency room with melena that started one week prior to hospitalization. The patient was diagnosed to have a tumor in the ampulla of Vater with bleeding on its surface. However post-op, he was diagnosed as having gangliocytic paraganglioma by immunohistochemistry.This tumor has precise clinical implications, and if continuous follow up is conducted after careful diagnosis and surgical treatment, invasive major operations, such as, radical pancreaticoduodenectomy can be avoided.Gangliocytic paragangliomas are rare tumors which are usually encountered in the second portion of the duodenum. They can be diagnosed histologically by the presence of epithelioid, spindle, and ganglion cells, which is similar to that observed for paraganglioma [1]. Although gancliocytic paragangliomas have no specific accompanying symptoms, they are sometimes found due to bleeding caused by mucosal ulceration, and rarely because of huge mass effect, such as, abdominal pain or obstruction. However, they are usually detected incidentally during radiologic imaging conducted for different purposes [2]. Here, we report a gangliocytic paraganglioma in the second portion of the duodenum in a patient hospitalized for melena, which was removed by pancreaticoduodenectomy. We also include a review of the literature.A 56-year-old male patient visited our emergency room due to melena of duration one week. History taking revealed no particular issues other than antihypertensive medication after a diagnosis of hypertension five years previously. He did no smoke, but consumed a small amount of alcohol regularly. No specific features arose from his family or social history. He did not experience nausea or vomiting at the time of hospitalization, and only complained of mild indigestion. Furthermore, he show
CD24 expression predicts distant metastasis in extrahepatic bile duct cancer
Kyubo Kim,Hye Sook Min,Eui Kyu Chie,Jin-Young Jang
World Journal of Gastroenterology , 2013, DOI: 10.3748/wjg.v19.i9.1438
Abstract: AIM: To evaluate the prognostic significance of CD24 expression in patients undergoing adjuvant chemoradiotherapy for extrahepatic bile duct (EHBD) cancer. METHODS: Eighty-four patients with EHBD cancer who underwent curative resection followed by adjuvant chemoradiotherapy were enrolled in this study. Postoperative radiotherapy was delivered to the tumor bed and regional lymph nodes up to a median of 40 Gy (range: 40-56 Gy). All patients also received fluoropyrimidine chemotherapy for radiosensitization during radiotherapy. CD24 expression was assessed with immunohistochemical staining on tissue microarray. Clinicopathologic factors as well as CD24 expression were evaluated in multivariate analysis for clinical outcomes including loco-regional recurrence, distant metastasis-free and overall survival. RESULTS: CD24 was expressed in 36 patients (42.9%). CD24 expression was associated with distant metastasis, but not with loco-regional recurrence nor with overall survival. The 5-year distant metastasis-free survival rates were 55.1% and 29.0% in patients with negative and positive expression, respectively (P = 0.0100). On multivariate analysis incorporating N stage, histologic differentiation and CD24 expression, N stage was the only significant factor predicting distant metastasis-free survival (P = 0.0089), while CD24 expression had borderline significance (P = 0.0733). In subgroup analysis, CD24 expression was significantly associated with 5-year distant metastasis-free survival in node-positive patients (38.4% with negative expression vs 0% with positive expression, P = 0.0110), but not in node-negative patients (62.0% with negative expression vs 64.0% with positive expression, P = 0.8599). CONCLUSION: CD24 expression was a significant predictor of distant metastasis for patients undergoing curative resection followed by adjuvant chemoradiotherapy especially for node-positive EHBD cancer.
PG-2, a Potent AMP against Pathogenic Microbial Strains, from Potato (Solanum tuberosum L cv. Gogu Valley) Tubers Not Cytotoxic against Human Cells
Jin-Young Kim,Ramamourthy Gopal,Sang Young Kim,Chang Ho Seo,Hyang Burm Lee,Hyeonsook Cheong,Yoonkyung Park
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14024349
Abstract: In an earlier study, we isolated potamin-1 (PT-1), a 5.6-kDa trypsin-chymotrypsin protease inhibitor, from the tubers of a potato strain ( Solanum tuberosum L cv. Gogu Valley). We established that PT-1 strongly inhibits pathogenic microbial strains, but not human bacterial strains, and that its sequence shows 62% homology with a serine protease inhibitor. In the present study, we isolated an antifungal and antibacterial peptide with no cytotoxicity from tubers of the same potato strain. The peptide (peptide-G2, PG-2) was isolated using salt-extraction, ultrafiltration and reverse-phase high performance liquid chromatography (RP-HPLC). Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS) showed the protein to have a molecular mass of 3228.5 Da, while automated Edman degradation showed the N-terminal sequence of PG-2 to be LVKDNPLDISPKQVQALCTDLVIRCMCCC-. PG-2 exhibited antimicrobial activity against Candida albicans, a human pathogenic yeast strain, and Clavibacter michiganensis subsp. michiganensis, a plant late blight strain. PG-2 also showed antibacterial activity against Staphylococcus aureus, but did not lyse human red blood cells and was thermostable. Overall, these results suggest PG-2 may be a good candidate to serve as a natural antimicrobial agent, agricultural pesticide and/or food additive.
The Community Structure of Macrozoobenthos and Its Temporal Change on the Gapo Artificial Tidal Flat in Masan Bay, Korea  [PDF]
Jin-Woo Choi, Jin-Young Seo, Soonmo An
Open Journal of Marine Science (OJMS) , 2013, DOI: 10.4236/ojms.2013.34022
Abstract:

This study was conducted to get some basic information on the community structure of macrozoobenthos and its temporal change at 3 sites on the Gapo artificial tidal flat within Masan Bay from March 2002 to April 2004 when 8 years passed after the construction. The Gapo artificial tidal flat was constructed by filling the dredged contaminated sediments of MasanBayfrom 1990 to 1993. The surface sediment consisted of fine particles, but the grain size at the tidal flat has changed from mud to muddy sand by adding coarse particles for manila clam aquaculture by local fishermen from 2002. A total of 35 faunal species including 23 species at the upper tidal flat, 28 species at the lower tidal flat and 30 species in the tidal channel were collected during the study period. Polychaete worms were the most dominant fauna in species number and total faunal density, but mollusks were the most dominant in biomass. There was a specific species composition along tidal level. At the upper tidal flat, Prionospio japonicus, Sigambra tentaculata, and Neanthes succinea were dominant and at the lower tidal flat, N. succinea, P. japonicus, Corophium sinensis, and Ruditapes philipinarum were dominant while

Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors
Kim, Chul-Joo;Kumar, Jyothi Rajesh;Kim, Joon-Soo;Lee, Jin-Young;Yoon, Ho-Sung;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012000700009
Abstract: in this study, amine based extractants (alamine 336, alamine 308, alamine 304 and aliquat 336) diluted in kerosene were used as promising extractants for uranium extraction and separation from other associated elements. alamine 336 was the best extractant for uranium extraction process from sulfate solutions when compared with other amine based extractants, alamine 308, alamine 304 and aliquat 336. synergistic extraction behavior was studied with amines as extractants as well as synergists and organophosphorus reagents used as synergist mixed with amines. synergistic extraction studies with amines were not suitable with each other for better extraction efficiency. however, amines mixed with organophosphorus extractants gave positive synergetic behavior with the highest synergistic coefficient 0.567 calculated from results obtained. the developed methodology was applied to uranium low grade ore processing and 99.83% of uranium was recovered without the interferences of other metals.
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