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Kwak, Cheol Hwan,Kang, Sung-Min,Jung, Euiyoung,Haldorai, Yuvaraj,Han, Young-Kyu,Kim, Woo-Sik,Yu, Taekyung,Huh, Yun Suk THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.63 No.-
<P><B>Abstract</B></P> <P>A customized droplet-based microfluidic reactor was fabricated for the synthesis of silver nanoparticles (Ag NPs) using silver nitrate (AgNO<SUB>3</SUB>) and branched polyethyleneimine (BPEI) as a precursor and a reducing agent, respectively. The effects of static mixing, temperature, and the volumetric flow rates of AgNO<SUB>3</SUB> and BPEI on the particle size were investigated. The use of a static mixer and the optimization of the reaction temperature enhanced the monodispersity of the Ag NPs. In addition, the size of the Ag NPs was manipulated by changing the flow rate ratio of AgNO<SUB>3</SUB> to BPEI at 60°C for 60min.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Suk-chul Kwak,Byung Kyu Kim,Dong-ik Kim,Young Whan Cho 대한금속ㆍ재료학회 2017 대한금속·재료학회지 Vol.55 No.11
A thin, compact, and uniform cobalt layer was coated on ferritic stainless steel (Crofer 22 APU) by high frequency square pulsed electrodeposition in an aqueous solution containing cobalt chloride and boric acid. The effects of various electrodeposition parameters and post heat treatment on the morphology, thickness, roughness and adhesion of the coating layer were investigated. It was found that neutralizing with sodium hydroxide solution after acid washing of the polished sample surface prevented delamination of the sub-surface layer. The addition of boric acid had a strong influence on the nucleation and agglomeration behavior of the deposited Co, which consequently controlled both the thickness and the roughness of the coating layer. With increasing current density, the grain size decreased and, therefore, a more uniform microstructure could be achieved. The duty cycle of the square pulse strongly affected the morphology but not the roughness of the coating layer. Subsequent heat treatment at 800 ℃ in air greatly improved the adhesion of the Co layer to the substrate. By optimizing the aforementioned electrodeposition parameters and adopting the post heat treatment, it was possible to obtain a fine, uniform, compact, and thin (< 2 μm) Co layer with excellent adhesion properties. (Received April 19, 2017; Accepted June 17, 2017)
곽형심,남철현,이규수,이순자,최연희,전연숙 경산대학교 보건복지연구소 2001 保健福祉硏究 Vol.6 No.-
A study on conducted in order to determine factors related to women's behavior concerning Hairdressing. The questionnairs were given to 321 adult women in large cities such as Seoul, Taegu, and Taejun; 320 in medium sized cities such as Kimchon, Sangju, Kumi; 117 in small cities like Geochang, Yechon, Hamchang total 758 of adult women all of whom were at least 20 years old during February 1st through March 31th of 1998. The following results were obtained. 1.In washing hair, 92.0% used shampoo at each wash and 40.0% made use of shampoo in condition of hair. And 68.6% used shampoo more than four times a week. When shampoo washing, 71.1% used one dose of shampoo, 53.6% used hair-rinse as well. 2.45.6% of the respondents said they had unhealthy or damaged hair, average 40.2%, and healthy hair with 14.1%. Those with damaged hair, 46.8% always used shampoo at each wash, 51.5% made use of shampoo in condition of hair, 46.7% used one dose of shampoo, 51.5% always used hair-rinse, and 48.4% maintained hairdrying after shampoo washed. 3.Most preferred service they chose was hair-cutting with 51.5%, followed by permanent waving with 34.4%. Characteristically those in their twenties and thirties prefer cutting to permanent, and permanent was preferred by those who are in their forties, housekeepers, living in small cities, in the middle class. Hair coloring and bleach was preferred by people of twenties, of office workers, in urban dwellers, of singles, and of upper class. To keep a healthy hair, only 1.8% of all answered women used hair and scalp treatments. 4.27.2% of respondents in their thirties chose the hairstyle of one length and 39.6% in their twenties chose the hairstyle of long hair with layers, short cutting hair was liked by 48.3% in their forties. Short cutting hairstyle was well received by housekeepers, professionals such as teachers, whereas long layered hairstyle was nicely agreed with office workers, students, and so on. 5.Influence factors to hairstyle in down scaling were cutting with 45.9%, hair coloring & bleach 24.7%, permanent 16.4%, and hairdrying 13.1%. More respondents satisfied with their own hairstyle than others were women of thirties, highschool graduates, professionals, urban dwellers, married women, catholics, upper class people, tall and slim, and of healthy hair and scalp. 6.The hairdos or hair services damaging the haler most were hair coloring & bleach with 58.7%, permanent waving with 19.0%, hair drying with 17.8% and hair iron with 4.5%. And 30.9% of women who received permanent waving service experienced some side-effects. Hair coloring generated 24.6% of the service receivers to experience some side-effects. 7.More women thought that healthy hair was more important than beautiful hairstyle. Relatively low points was obtained for women knowing how to manage a healthy hair and scalp, with points 6.61±2.03 (66.1 if 100 points is applied). 8.They gained their knowledge about hair health and hairdos through fashion magazine with 54.4%, T.V. and other media with 18.1%, advice from hair dressers with 15.2%, and 'beauty' lectures or seminars with 3.4%, and other sources with 9.0%.
Adenosine 부하 99mTc-MIBI 심근 관류스캔도중 나타나는 ST 절 하강과 관상동맥 질환의 중증도와의 관계
이규보(Kyu Bo Lee),이재태(Jae Tae Lee),손상균,채성철,전재은,박의현,정병천(Byung Cheon Chung),최정일(Chung Il Choi),곽동석(Dong Suk Kwak),강승완(Seung Wan Kang),우언조(Eon Jo Woo),김정균(Jeong Gyun Kim),배선근(Sun Kun Bae),조정아(Jung Ah Cho) 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.2
N/A Pharmacologic coronary vasodilation in conjunct.ion with myocardial perfusion scintigraphy has become an alternative to dynamic exercise test for the diagnosis and risk stratification of coronary arter y disease, especially in patients who are unable to perform adequate exercise. Dipyridamole and adenosine have been used for pharmacologic stress t,esting with myocardial perfusion imaging. Adenosine is a potent, coronary vasodilator with rapid onset of action, short half Iife, near maximal coronary vasodilation and less serious side effects. ST segment depression has been reported in about 7-15% of patients with coronary artery disease receiving dipyridamole in conjunction with myocar dial perfusion imaging. The exact cause and clinical significance are not known. In order to evaluate ihe relationship between adenosine-induced ST segment depression dur- ing Tc-MIBI myocardial perfusion scin(igraphy and the severity of coronary artery disease, we performed 99mTc-MIBI imaging after int#ravenous infusion of adenosine in 120 patients with susper,t.ed coronary artery disease. Of t.he 120 patients, 28 also performed coronary angiography. There were 24 patients with ST segment depression during 99mTc-5/IIBI scintigraphy and 96 patients without ST segment depression. Adenosine was infused intravenously at. a dose of 0.14mg/kg per minute for 6minutes and 99mTc-MIB1 was injected at 3 miinute. We then compared the hemodynamic changes, side effects, scintigraphic and angiographic findings. Heart, rate increased 90 +- 19 beats/minute in t.he group with ST depression compared with 80+16 beats/rninute in the group without ST depression(p<0.05). Baseline systolic blood pressure was significantly higher in the group with ST depression(152 +- 27 mmHg) than in the group without ST depression(140 +- 21mmHg, p<0.05). Double product, at baseline(10.90 +- 2.77 versus 9.55 +- 2.34beats/minutexmmHg) and during adenosine infusion(12.72 +- 3.89 versus 10.83+2.98 beats/minutexmrnHg) were significant,ly higher in t.he group with ST de pression(p<0.05). The incidenoe of anginal chest pain was also significantly higher in the group with ST depression(75 versus 29%, p<0.0001). The 99mTc-MIBI images were abnormal in 23(96%) patients wit.h ST segment depression and 66(69%) patients without ST segment depression(p<0.05). In patients with ST segment depression, there were more reversible per- fusion defects than in patients without ST segment depression(83 versus 55%, p<0.05). The number of abnormal segments were significantly higher in the group with ST depression(3.05 +- 2.01 versus 1.51 +- 1.45, p<0.005). In patients with ST segment depression, there were more segments of reversible perfusion defects than in patients without segment depression(2.15 +- 2. 11 versus 0.89 +- 1.24, p<0.05). There were no differences in the angiographic severity by ves sel(p, NS). We concluded that ST segment depression during 99mTc-MIBI myocardial perfusion scintigraphy with intravenous adenosine is related to the severity of coronary artery disease.
Lim, Kyu,Yoon, Suk-Joo,Lee, Myung-Sun,Byun, Sang-Hyun,Kweon, Gi-Ryang,Kwak, Sang-Tae,Hwang, Byung-Doo 충남대학교 생물공학연구소 1997 생물공학연구지 Vol.5 No.-
Glucocorticoids are known to inhibit testicular function, and its receptor is also localized in the Sertoli cells. To evaluate possible role of glucocorticoid in Sertoli cells, the effects of dexamethasone on the expression of androgen binding protein (ABP) have been investigated in primary Sertoli cell cultures. Dexamethasone increased ABP mRNA levels, with maximal stimulation reached at 36 hr. The induction of ABP mRNA was dependent on the low concentration (10^-8 and 10^-7 M) of dexamethasone but gradually reduced in the cells treated with high concentration (10^-6 and 10^-5 M). Dexamethasone-induced ABP mRNA level was no change in the cells after addition of cycloheximide but almost reduced by actinomycin-D pretreatment. Steady-state levels of ABP mRNA gradually increased in the Sertoli cells prepared from 14- and 21-days of age corresponding to rat puberty, and ABP mRNA was induced by dexamethasone. These results suggest that ABP gene is transcriptionally regulated by dexamethasone in primary Sertoli cell cultures. ⓒ 1996 Academic Press, Inc.