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MTBE + Methanol 혼합계의 등온 기액평형에 미치는 염효과
황태원,박소진,한규진 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.4
Methyl tert-butyl ether(MTBE)+methanol 혼합계의 등온 기백평형에 대한 염효과(salt effect)를 298.15K, 308.15K 그리고 323.15K에서 headspace gas chromatography(H.S.G.C)를 이용하여 측정하였다. LiCl, NaCl, KCI, LiBr, KBr 등의 염에 의한 MTBE+methanol 혼합계의 기액평형에 미치는 염효과 측정 결과 LiCl과 LiBr에 의한 공비점 이동 효과를 확인하였는데, 사용된 염들이 MTBE에는 거의 용해되지 않기 때문에 MTBE가 풍부한 영역에서는 적은 농도의 염이 포함되는 경우에도 좋은 효과를 나타내었다. 특히 298.15K와 308.15K의 온도에서 액상에 LiBr이 포화되어 있을 때 공비점이 완전히 제거되는 효과를 보였다. Salt effects on vapor-liquid equilibrium at 298.15 K, 308.15 K and 323.15 K were measured for the methyl tert-butyl ether(MTBE)+methanol system with salts(LiCl, NaCl, KCl, LiBr and KBr) by headspace gas chromatography(H.S.G.C). The azeotrope of MTBE+methanol system was remarkably shifted with LiBr and LiCl. Since salts are nearly insoluble in MTBE, salting-out effect was satisfied even though in the case of relatively very low salt concentration in MTBE-rich region. Especially at 298.15 K and 308.15 K, the azeotropes were eliminated completely when liquid phase was saturated with LiBr.
황태원,백건욱,박성주,류경범,김지영,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The power conversion efficiencies of ZnO-based solar cells are considerably lower than those reported for TiO<sub>2</sub>. It is because Zn<sup>2+</sup>/dye complex is formed during prolonged sensitization process, and it lowers the electron injection efficiency from excited dye to ZnO. Thus, it is necessary to increase dye-adsorption amount in a short time. In this study, we investigated amount of dye-adsorption on metal-cation adsorbed ZnO surface. ZnO nanorods were soaked into aqueous solutions containing metal cations to produce positively charged ZnO surface, and then they were dipped into the dye solution to load dyes. As a result, dye-loading amount was increased by electrostatic interaction between positively charged ZnO and negatively charged dye, compared to that of the simple dipping process.
황태원,박재웅,위석,조한백,유심근 한국전통의학연구소 2002 한국전통의학지 Vol.12 No.1
Baelantang(BLT) is used in female infertility caused by ovulation disorder. An attempt was to evaluate the influences, of BLT on the serum concentrations of FSH, LH, estradiol(E_(2)) and progesterone, the histological and optical changes of ovary, ovary weight of rats. The results of the study were as follows : 1. Blood FSH level increased experimental group as compared with control group on 7th day, which showed no efficacy. 2. Blood LH level increased in experimental group as compared with control group on 7th day and decreased 14th day, which showed no efficacy. 3. Blood E_(2) level decreased in experimental group as compared with control group on 7th day and increased 14th day, which showed no efficacy. 4. Blood progesterone level increased in experimental group as compared with control group on 7th day and decreased 14th day, which showed no efficacy. 5. In histological observations of ovary, ovulation increased in experimental group as compared control group on 7th day and on 14th day, which showed no efficacy. 6. In optically observations of ovary, weight of ovary increased in experimental group as compared with control group on 7th day and 14th day, which showed no efficacy. According to these results, BLT did not influence on the ovulation and ovary of rats.
황태원,홍단비,이정훈 한국인터넷전자상거래학회 2017 인터넷전자상거래연구 Vol.17 No.6
The purpose of this study is to empirically analyze major influence factors that would affect potential customer’s intention to use of Home IoT services based on Technology Acceptance Model and Innovation Diffusion Theory. In developing the research model, we have focused on measuring the influential factors based on previous studies, which are Home IoT product innovativeness, potential customers’ personal innovativeness and perceived usefulness, perceived ease of use, perceived cost, perceived risk and social influence when using Home IoT services. The results shows that Personal innovativeness in personal characteristics influences perceived usefulness in a positive way. Product innovativeness in product characteristics has significant effects on perceived usefulness and perceived ease of use. Perceived cost influences behavioral intention to use in a negative way. Perceived ease of use has significant effects on perceived usefulness and behavioral intention to use, also perceived usefulness influence behavioral intention to use in a positive way. However, social influence and perceived risk don’t have significant effects on perceived usefulness.
황태원,류경범,박성주,최주연,여인영,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We have modified TiO<sub>2</sub> surfaces using aqueous sodium hydroxide (NaOH) solution at different solution temperatures and soaking time via a simple dip coating process, and the resulting electrodes (SH-TiO<sub>2</sub>/ FTO) were used as a electron transporting layers of solar cells. The device with bare-TiO<sub>2</sub>/FTO showed the performance with Voc=0.59 V, Jsc=18.84 mA/㎠ and FF=61.28%, which leads to a power conversion efficiency (PCE) of 6.80%, whereas, for the device with SH(40/10)-TiO<sub>2</sub>/ FTO prepared by surface treatment at 40°C for 10 min, the PCE was increased to 7.60% (Voc = 0.72 V, Jsc = 17.52 mA/㎠ and FF = 61.81%) due to an increase in Voc by more than 22%.