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So-Yoon Yee,Na-Yeon Kim,Ju-Yeon Park,Hye-Won Mok,Yu-Gyeong Kim,Bo-Young Seok,Hee-Jeong Hwang,Myong-Soo Chung 한국산업식품공학회 2018 학술대회 및 심포지엄 Vol.2018 No.04
Black pepper (piper nigrium L.) is a spice commonly used but has a problem with microbial control, so it needs non-thermal decontamination method for product quality of dried foods. Intense pulsed light (IPL) technology is a non-thermal method for superficial decontamination of foods to inactivate pathogenic microorganisms by using high peak power and short duration pulses of a broad-spectrum (170-2600 nm) using a xenon lamp. The objective of this study was to reduce total number of bacteria in ground black pepper effectively by combined treatments of IPL and immobilized TiO2 photocatalyst. Self-designed cyclone type of pilot-scaled IPL device (> 5 kg/h) was used, which makes samples to flow cyclonically in a vacuum space longer time rather than moving vertically. Using this device alone, without TiO2 coated, 0.3-0.6 log reductions were achieved under a total energy fluence of 14.85 J/cm2 (DC voltage; 1200, 1800, and 2400 V, pulse duty; 0.5, 2.1, and 3.0 ms, treatment time; 60, 120, 180, 240, and 300 s, frequency; 2 Hz). Subsequently, TiO2-coated quartz plates with different layers between light source and samples were installed to observe the effect of photocatalyst and the efficiency of decontamination was improved slightly. However to increase the effect of the photocatalyst, several factors (TiO2 particle size, TiO2 film thickness and transparency, adhesiveness between quartz and photocatalyst, etc.) need to be concerned additionally. Nevertheless, the application of IPL treatment combined with TiO2 photocatalyst offers a potential of effective non-thermal decontamination method for dealing with powder foods in food industry.
Electroless Nickel Plating on Fibers for the Highly Porous Electrode
Cheon, So-Young,Park, So-Yeon,Rhym, Young-Mok,Kim, Doo-Hyun,Koo, Yeon-Soo,Lee, Jae-Ho The Korean Electrochemical Society 2010 Journal of electrochemical science and technology Vol.1 No.2
Materials used as fuel cell electrode should be light, high conductive, high surface area for reaction, catalytic surface and uniformity of porous structure. Nickel is widely used in electrode materials because it itself has catalytic properties. When used as electrode materials, nickel of only a few im on the surface may be sufficient to conduct the catalytic role. To manufacture the nickel with porous structure, Electroless nickel plating on carbon fiber be conducted. Because electroless nickel plating is possible to do uniform coating on the surface of substrate with complex shape. Acidic bath and alkaline bathe were used in electroless nickel plating bath, and pH and temperature of bath were controlled. The rate of electroless plating in alkaline bath was faster than that in acidic bath. As increasing pH and temperature, the rate of electrolee plating was increased. The content of phosphorous in nickel deposit was higher in acidic bath than that in alkaline bath. As a result, the uniform nickel deposit on porous carbon fiber was conducted.
The effect of bath conditions on the electroless nickel plating on the porous carbon substrate
So-Young Cheon,So-Yeon Park,Young-Mok Rhym,Doo-Hyun Kim,Jae-Ho Lee 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Electroless nickel plating is widely used technique in industries. In most cases, electroless nickel plating was applied on the open surfaces and the rate of deposition was controlled with temperature and time. However, when the electroless plating is applied on the porous carbon, the rate of deposition is also dependent on the activation process. In this research, electroless nickel plating on the porous carbon was investigated. The porous carbon was selected as the substrate. The pore sizes of carbon substrates were 16―20 mm and over 20 mm. Since hydrophobic surface prevented the penetration of solution into porous carbon, the carbon surface changed from hydrophobic to hydrophilic after immersing the substrate in an ammonia solution at 60 ℃. The alkaline bath and acidic bath were used in electroless nickel plating. The pHs were 9―11 in alkaline bath and 4―5 in acidic bath. The content of phosphorous in nickel deposit was higher in acidic bath than that in alkaline bath. As increasing pH in each bath conditions, the content of phosphorous in nickel deposit was decreased. The rate of electroless plating in alkaline bath was faster than that in acidic bath. The minimum concentration of PdCl_2 for the electroless nickel plating was 10 ppm in acidic bath and 5 ppm in alkaline bath. The thickness of nickel was not significantly affected by the concentration PdCl_2.
Mok Hur,Yurry Um,Jemin Yoo,So Hyun Park,Yi Lee,Jin Tae Jung,Yeon Bok Kim,Seong Cheol Kim,Chan Sik Jung 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05
Background : Astragalus membranaceus is one of the most widely used traditional medicinal herbs in Korea. Studies on the genomic of A. membranaceus resources have not been carried out so far. The present study was carried out to discriminate A. membranaceus based on genetic diversity using genomic simple sequence repeat (SSR) markers. Methods and Results : We collected 5 A. membranaceus lines: Asung, Poongsung, Am-Jecheon, Am-Sancheong, and Am-China. One hundred mg of fresh leaves were used for genomic DNA extraction using the DNeasy plant DNA isolation kit (Qiagen GmbH, Hilden, Germany). 450,449 contigs were searched for 147,766 SSR candidate loci in this study using the MicroSAtellite identification tool (MISA). We selected 949 A. membranaceus genomic SSR markers that were showed variation for the five collections in silico screening with CLC genomics workbench program. The genetic diversity of all A. membranaceus resources was analyzed using 17 SSR markers employing the DNA fragment analysis method. Based on the genetic diversity analysis, these lines were classified into four distinct groups. Conclusion : These findings could be used for further research on cultivar development using molecular breeding techniques and for conservation of the genetic diversity of A. membranaceus. Furthermore, the markers could be used for marker-assisted selection for crop breeding.
만성 기침환자에서 기관지 과민성, 아토피와 비만의 상관관계: 두 기관 연구
박소영 ( So Yong Park ),박종원 ( Jong Won Park ),오연목 ( Yeon Mok Oh ),이양근 ( Yang Keun Rhee ),이영목 ( Young Mok Lee ),박용범 ( Yong Bum Park ),임성용 ( Seong Yong Lim ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.1
Background: The rising prevalence of asthma worldwide may be associated with the rising prevalence of obesity in developed nations. Although several studies have suggested a relationship between asthma and obesity, controversy still remains. The aim of this study was to examine the relationship between obesity and asthmatic factors such as atopy, eosinophilia, serum total Ig E and bronchial hyperresponsiveness in chronic cough patients. Methods: This study was a retrospective, observational study in two centers done between January 2007 and June 2008. The subjects included individuals who had a chronic cough. We examined body mass index (BMI) to measure obesity and pulmonary function. We did a metacholine provocation test for airway hyperresponsiveness (AHR), a skin prick test for atopy, and tests for blood eosinophils and serum IgE. Results: A total of 1022 subjects were included. Airway hyperresponsiveness was not related with obesity (p=0.06), and atopy incidence was significant higher in non obese patients (p=0.00). There was no significant difference in serum IgE and blood eosinophil counts between obese and non obese patients. Forced expiratory volue in one second (FEV1)/forced vital capacity (FVC) was significantly reduced in obese patients (p=0.03), but FEV1 and FVC were no significant difference between obese and non obese patients. Conclusion: There is no relationship between obesity and bronchial hyperresponsiveness. The nonobese group appears to have more atopy. The relationship between obesity and bronchial hyperresponsiveness and atopy need further investigation.
Bak, So Hyeon,Kim, Sung Mok,Park, Sung-Ji,Kim, Min-Ji,Choe, Yeon Hyeon Korean Society of Magnetic Resonance in Medicine 2017 Investigative Magnetic Resonance Imaging Vol.21 No.1
Purpose: To evaluate quantification results of single breath-hold (SBH) magnetic resonance (MR) cine imaging compared to results of conventional multiple breath-hold (MBH) technique for left ventricular (LV) function in patients with cardiac arrhythmia. Materials and Methods: MR images of patients with arrhythmia who underwent MBH and SBH cine imaging at the same time on a 1.5T MR scanner were retrospectively reviewed. Both SBH and MBH cine imaging were performed with balanced steady state free precession. SBH scans were acquired using temporal parallel acquisition technique (TPAT). Fifty patients ($65.4{\pm}12.3years$, 72% men) were included. End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), ejection fraction (EF), myocardial mass, and LV regional wall motion were evaluated. Results: EF, myocardial mass, and regional wall motion were not significantly different between SBH and MBH acquisition techniques (all P-values > 0.05). EDV, ESV, and SV were significant difference between the two techniques. These parameters for SBH cine imaging with TPAT tended to lower than those in MBH. EF and myocardial mass of SBH cine imaging with TPAT showed good correlation with values of MBH cine imaging in Passing-Bablok regression charts and Bland-Altman plots. However, SBH imaging required significantly shorter acquisition time than MBH cine imaging ($15{\pm}7sec$ vs. $293{\pm}104sec$, P < 0.001). Conclusion: SBH cine imaging with TPAT permits shorter acquisition time with assessment results of global and regional LV function comparable to those with MBH cine imaging in patients with arrhythmia.