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Search Results: 1 - 10 of 13819 matches for " Jae Young Choi "
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A Study on Development of Balanced Scorecard for Management Evaluation Using Multiple Attribute Decision Making  [PDF]
Kwang Mo Yang, Young Wook Cho, Seung Hee Choi, Jae Hyun Park, Kyoung Sik Kang
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.33032
Abstract: Recently, most businesses have introduced a system for improving their responsibility to the customers in terms of job improvement. For example, small-quantity batch production increases cost but improve efficiency of management. Companies have been introduced the balanced scorecard to evaluate their management as part of improvement, while they suffer from many trials and errors. Many businesses still have difficulty in introducing balance scorecard concept in their process, but we suggest a method to successfully introduce the balance scorecard. This study aims to suggest a new performance measurement model reflecting relative importance of the key performance indicators for each factor. Our model is applied to several companies in real-world to validate the new model. Also, our study proposes a methodology for an adequate performance measurement using multiple attribute decision making.
Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia  [PDF]
Dorjpalma Enkhbayar, Jieun Seo, Seon-Gyu Choi, Young Jae Lee, Enkhbayar Batmunkh
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.71003
Abstract: The Mushgai khudag volcanic-plutonic complex consists of four REE mineralization zones: carbonatite zone, apatite zone, magnetite zone, and monazite zone. REE mineralization occurs within peripheries of alkaline magmatic rocks which consist of porphyritic syenite, microsyenite and quartz syenites. Three types of LREE-rich apatite can be found in the carbonatite, apatite, and monazite zones. Crystal-1 type of apatite exists as hexagonal prismatic shape and is mostly found in the apatite zone, and in syenite. Crystal-2 type of apatite can be exposed also at the apatite zone, and carbonatite zone as brecciated massive crystalline aggregate. Crystal-3 type of apatite demonstrates the compositional zoning texture with monazite as inter-zoning, and is only found in monazite zone. The LREE-bearing apatites from the Mushgai khudag complex are mostly fluorapatite to hydroxyl-bearing fluorapatite with variable REE content. Apatites from the monazite zone present individual sulfur-rich monazite grain, and are formed by comprehensive substitutions.
Thermal Degradation Kinetics of iPP/Pd Nanocomposite Prepared by a Drying Process  [PDF]
Y Jae-Young Lee, Hong-Ki Lee, Sung-Wan Hong, Il-Yub Choi
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B030
Abstract: Palladium (Pd) nanoparticles were incorporated into isotactic polypropylene (iPP) film by a one-step dry process. iPP film was exposed to the sublimed Pd(acac)2 vapor in a glass vessel at 180oC. The Pd nanoparticles were observed by transmission electron microscope (TEM), and it was found that metallic nanoparticles were selectively loaded on the amorphous regions between the lamellae in iPP. Thermal degradation kinetics was investigated by introducing the data of thermogravimetric analysis (TGA) to Flynn & Wall equation. TGA data showed that thermal degradation temperature (Td) of the neat iPP was improved about 35oC by loading 0.27 wt% Pd nanoparticles. Thermal degradation activation energy (Ed) for iPP/Pd nanocomposite was 227.85 kJ/mol while that of neat iPP was 220.57 kJ/mol. These results meant that the Pd nanoparticles acted as a retardant in the thermal degradation of neat iPP polymer chain.
Understanding of Ultrasonic Assisted Machining with Diamond Grinding Tool  [PDF]
Kyung-Hee Park, Yun-Hyuck Hong, Kyeong-Tae Kim, Seok-Woo Lee, Hon-Zong Choi, Young-Jae Choi
Modern Mechanical Engineering (MME) , 2014, DOI: 10.4236/mme.2014.41001

In this work, machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic (Al2O3) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20 kHz was generated by HSK 63 ultrasonic actuator. On the other hand, grinding forces were measured by KISTLER dynamometer. And an optimal sampling rate for grinding force measurement was obtained by a signal processing and frequency analysis. The surface roughness of the ceramic was also measured by using stylus type surface roughness instrument and atomic force microscope (AFM). Besides, the scanning electron microscope (SEM) was used for observation of surface integrality.

Individual Indentification and Parentage Verification of Thoroughbred Horses and the Korean Native Horses Based on Microsatellite Loci in Korea
Seoung Kyoon Choi,Sun Young Lee,Gil Jae Cho
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2647.2651
Abstract: This study was performed for individual identification and parentage verification of Thoroughbred Horse (TBH) and the Korean Native Horse (KNH). A total number of 1,308 (84 KNH and 1,224 TBH samples including 1,005 foals for parentage testing) were genotyped. Genomic DNAs were extracted from whole blood or hair roots and genotyped by using 14 microsatellite markers (AHT4, AHT5, ASB2, ASB17, ASB23, CA425, HMS1, HMS3, HMS6, HMS7, HTG4, HTG10, LEX3 and VHL20) in TBH and 17 microsatellite markers including HMS2, HTG6, HTG7 in the KNH. This method consisted of multiplexing PCR procedure and showed reasonable amplification of all PCR products. Genotyping were determined with an ABI 3100 genetic analyzer. All the loci analyzed in 17 microsatellite markers showed a polymorphic patterns. The number of alleles per locus varied from 3-9 with a mean value of 6.36 and 5-10 (mean 7.35) in TBH and KNH, respectively. The expected heterozygosity was ranged from 0.539-0.827 (mean 0.700), from 0.387-0.841 (mean 0.702) in TBH and the KNH, respectively. The total exclusion probability of 14 microsatellite loci was 0.9998 in TBH and 0.9999 in the KNH. Of the 14-17 markers, ASB2, ASB17, ASB23, HMS7, HTG10 and LEX3 loci in TBH and AHT4, AHT5, CA425, HMS2, HMS3, HTG10 and LEX3 loci in the KNH have relatively high PIC value (>0.7). Of the 1005 foals, 1003 foals (99.80%) were qualified by compatibility according to the Mendelian fashion. These results indicated that the present microsatellites serve as useful tools for individual identification and paternity testing of TBH and the KNH in Korea.
Broad Band-Stop Filter Using Frequency Selective Surfaces in Uniplanar Microwave Transmission Line
Jae-Young Kim;Jung Han Choi;Chang Won Jung
PIER Letters , 2012, DOI: 10.2528/PIERL12022705
Abstract: We present a band-stop filter (BSF) by using a periodic structure property of frequency selective surfaces (FSSs) embedded in a microstrip transmission line. The proposed BSF is designed with FSS unit cells modifying the cross-loop slots. The center frequency (f) of the BSF is 6.6 GHz, and the 3-dB bandwidth varies by the number of cascading unit cells. The BSF is interpreted with an equivalent circuit model and a dispersion diagram, and exhibits uniplanar geometry, low return loss, simple fabrication, smaller size, and wide bandwidth.
Artificial biosynthesis of phenylpropanoic acids in a tyrosine overproducing Escherichia coli strain
Kang Sun-Young,Choi Oksik,Lee Jae,Hwang Bang
Microbial Cell Factories , 2012, DOI: 10.1186/1475-2859-11-153
Abstract: Background The phenylpropanoid metabolites are an extremely diverse group of natural products biosynthesized by plants, fungi, and bacteria. Although these compounds are widely used in human health care and nutrition services, their availability is limited by regional variations, and isolation of single compounds from plants is often difficult. Recent advances in synthetic biology and metabolic engineering have enabled artificial production of plant secondary metabolites in microorganisms. Results We develop an Escherichia coli system containing an artificial biosynthetic pathway that yields phenylpropanoic acids, such as 4-coumaric acid, caffeic acid, and ferulic acid, from simple carbon sources. These artificial biosynthetic pathways contained a codon-optimized tal gene that improved the productivity of 4-coumaric acid and ferulic acid, but not caffeic acid in a minimal salt medium. These heterologous pathways extended in E. coli that had biosynthesis machinery overproducing tyrosine. Finally, the titers of 4-coumaric acid, caffeic acid, and ferulic acid reached 974 mg/L, 150 mg/L, and 196 mg/L, respectively, in shake flasks after 36-hour cultivation. Conclusions We achieved one gram per liter scale production of 4-coumaric acid. In addition, maximum titers of 150 mg/L of caffeic acid and 196 mg/L of ferulic acid were achieved. Phenylpropanoic acids, such as 4-coumaric acid, caffeic acid, and ferulic acid, have a great potential for pharmaceutical applications and food ingredients. This work forms a basis for further improvement in production and opens the possibility of microbial synthesis of more complex plant secondary metabolites derived from phenylpropanoic acids.
Inhibition of Lipolysis in the Novel Transgenic Quail Model Overexpressing G0/G1 Switch Gene 2 in the Adipose Tissue during Feed Restriction
Sangsu Shin, Young Min Choi, Jae Yong Han, Kichoon Lee
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100905
Abstract: In addition to the issue of obesity in humans, the production of low-fat meat from domestic animals is important in the agricultural industry to satisfy consumer demand. Understanding the regulation of lipolysis in adipose tissue could advance our knowledge to potentially solve both issues. Although the G0/G1 switch gene 2 (G0S2) was recently identified as an inhibitor of adipose triglyceride lipase (ATGL) in vitro, its role in vivo has not been fully clarified. This study was conducted to investigate the role of G0S2 gene in vivo by using two independent transgenic quail lines during different energy conditions. Unexpectedly, G0S2 overexpression had a negligible effect on plasma NEFA concentration, fat cell size and fat pad weight under ad libitum feeding condition when adipose lipolytic activity is minimal. A two-week feed restriction in non-transgenic quail expectedly caused increased plasma NEFA concentration and dramatically reduced fat cell size and fat pad weight. Contrary, G0S2 overexpression under a feed restriction resulted in a significantly less elevation of plasma NEFA concentration and smaller reductions in fat pad weights and fat cell size compared to non-transgenic quail, demonstrating inhibition of lipolysis and resistance to loss of fat by G0S2. Excessive G0S2 inhibits lipolysis in vivo during active lipolytic conditions, such as food restriction and fasting, suggesting G0S2 as a potential target for treatment of obesity. In addition, transgenic quail are novel models for studying lipid metabolism and mechanisms of obesity.
Adsorption Characteristics of Chromium Ions onto Composite Alginate Bead
Tae Young Kim,Jae Hoon Chung,Se Young Choi,Sung Yong Cho
Lecture Notes in Engineering and Computer Science , 2008,
Procalcitonin Levels in Patients with Complete and Incomplete Kawasaki Disease
Hwa Jin Cho,Young Earl Choi,Eun Song Song,Young Kuk Cho,Jae Sook Ma
Disease Markers , 2013, DOI: 10.1155/2013/265051
Abstract: Incomplete Kawasaki disease (iKD) is considered to be a less complete form of Kawasaki disease (cKD), and several differences in the laboratory presentations of iKD and cKD have been noted. We investigated serum procalcitonin levels in patients with iKD, cKD, and other febrile diseases (a control group). Seventy-seven patients with cKD, 24 with iKD, and 41 controls admitted to our hospital from November 2009 to November 2011 were enrolled in the present study. We obtained four measurements of serum procalcitonin levels and those of other inflammatory markers from each patient. Samples were taken for analysis on the day of diagnosis (thus before treatment commenced; D0) and 2 (D2), 14 (D14), and 56 days (D56) after intravenous immunoglobulin infusion. We obtained control group data at D0. The mean D0 serum procalcitonin levels of cKD patients ( ?ng/mL) and controls ( ?ng/mL) were significantly higher than those of iKD patients ( ?ng/mL) ( and , resp.). No significant difference in mean procalcitonin level was evident among groups at any subsequent time. In conclusion, the serum procalcitonin level of patients with acute-stage cKD was significantly higher than that of iKD patients. 1. Introduction Kawasaki disease (KD) is a form of systemic vasculitis, the etiology of which is unknown. No definitive diagnostic laboratory test exists [1, 2]. Diagnosis is based on clinical signs raising suspicion of the disease, including fever of over 5 days in duration and at least four of the following five symptoms: bilateral bulbar conjunctival infection, changes in the oral mucosa, changes in the peripheral extremities, polymorphous rash, and cervical adenopathy more than 1.5?cm in diameter [3]. Complete KD (cKD) is diagnosed if all diagnostic criteria are fulfilled, whereas incomplete KD (iKD), which occurs in 15–20% of KD patients, is diagnosed when not all clinical features are present provided that several suspicious features are evident, laboratory findings suggest the presence of KD, and alternative diagnoses have been excluded [4]. Because only some (thus not all) clinical symptoms typical of cKD are apparent, iKD diagnosis can be delayed [5, 6], and such delay is a risk factor for development of coronary artery lesions [7, 8]. Although iKD is considered to be an incomplete form of cKD, because iKD and cKD patient demographic and laboratory findings are similar [9, 10], several differences in clinical and laboratory presentations have been described. Relatively more children with iCD are found at the extremes of the childhood age spectrum (≤1 year of age, or
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