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The Informational Role of Volume by Investor Group
Song-Yue, Han 한국재무학회 2008 한국재무학회 학술대회 Vol.2008 No.05
This paper studies the informational role of trading volume using common stocks categorized by investor group in Korean stock market from January 2004 to December 2006. The GARCH(1,1) model fits Korean stock market well and the volume variables ( such as absolute value of the net buy volume, excess buy volume and excess sell volume) have additional explanatory effect when they are included in the variance equation of the GARCH(1,1) model. This paper further test whether the effects of excess sell volume and excess buy volume on volatility is asymmetric. In addition, the effects of volume on volatility are shown to be different by investor groups. Because of the information disadvantage, the daily return volatility is highly correlated with the volume of domestic individual investors and non-listed foreign investors. Finally, I extend this result to an expanded data set that includes 477 common stocks.
Yue Lin,Yuanyuan Zhang,Qiongtao Song,Tao Song,Xue Han,Ying Zhang,Xuan Zhang,Xi Chu,Fenghua Zhang,Li Chu,Jianping Zhang 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.10
To explore the cardiovascular protective effectsof Magnesium isoglycyrrhizinate (MI), especially theunderlying cellular mechanisms related to L-type calciumchannels and myocardial contractility, and to examine theeffects of MI on hERG K? current expressed in HEK293cells. We used the whole-cell patch clamp technique,video-based edge detection and dual excitation fluorescencephotomultiplier systems to explore the effect of MIon L-type Ca2? currents (ICa-L) and cell contraction in ratcardiomyocytes. We also examined the rapidly activatingdelayed rectifier potassium current (IKr) expressed inHEK293 cells using a perforated patch clamp. MI inhibitedICa-L in a dose-dependent manner, with a half-maximalinhibitory concentration (IC50) of 0.22 mg/ml, and themaximal inhibitory effect was 61.10 ± 0.59%. MI at aconcentration of 0.3 mg/ml reduced cell shortening by24.12 ± 3.97% and the peak value of the Ca2? transient by36.54 ± 4.96%. MI had no significant influence on hERGK? channels expressed in HEK293 cells at all testpotentials. MI exerts protective effects on the heart via theinhibition of ICa-L and cell shortening in rat cardiomyocytes. However, MI had no significant influence on IKr;thus, MI may exert cardioprotective effects without causingdrug-induced long QT syndrome.
Mingyao Song,Zhengyang Duan,Ronggao Qin,Xiaojun Xu,Shuli Liu,Shumin Song,Mengjiao Zhang,Yue Li,Jiemei Shi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
Xanthate-modified baker’s yeast (XMBY) was successfully synthesized by grafting xanthate groups onto the surface of baker’s yeast and was used for the simultaneous adsorption of cadmium (Cd2+) and methylene blue (MB) from aqueous solution. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the synthesized adsorbent. The results indicated that the sulfur groups were successfully introduced onto the surface of the baker’s yeast and participated in the adsorption processes. The kinetic and isotherm data showed good correlations with the pseudo-second-order model and the Langmuir model, respectively. The equilibrium time and the maximum values obtained from the two models were 40 min, 239.8mg/g for Cd2+ and 300 min, 64.45mg/g for MB, respectively. The thermodynamic analysis (G<0, H>0, S>0) demonstrated that the adsorption processes of Cd2+ and MB onto the XMBY were endothermic and spontaneous. In the binary-component solution (Cd2+ and MB), the adsorption capacity for MB was almost unaffected by the presence of Cd2+ and interestingly, the adsorption capacity for Cd2+ increased in the presence of MB. Overall, these results indicated that XMBY could be a promising adsorbent for the treatment of wastewater containing both Cd2+ and MB.
Zhang Ni,Jiang Jia,Song Yue-Hua 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Two new species: A. (Arboridia) xiaotungensis sp. nov. and A. (Arboridia) luojiashangensis sp. nov. from Guizhou Province, China are described and illustrated. In addition, the appearances of A. reniformis Song & Li (2013a) and A. anteoculara Song & Li (2013a) are supplementarily described. A key to distinguish all known species of the genus from China is provided. LSID: https://www.zoobank.org/urn:lsid:zoobank.org:pub:3DD14108-ED08-430D-AE8D-CD0 FCC215A4E
Jiang Jia,Tan Wei-Wen,Song Yue-Hua 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
In this paper, one new species of the leafhopper genus Thaioneura Song, Li & Dietrich, 2016 from Guizhou Province, China are described and illustrated: Thaioneura huajiangensis sp. nov. And the female ovipositors are photographed and described. A key to distinguish all known species of the genus is provided. The hind wing venation of the new species are the same as the T. suphanburia and T. sinuata, and not common in the tribe Erythroneurini.
Yue Liu,Xueqing Yang,Kangliang Peng,Qiong Wang,Jianzhen Huang,Zilin Zhang,Jiang Lu,Hao Xu,Jieguang Song,Lin Chen 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Yttrium aluminum garnet (YAG), which possesses excellent properties, is investigated and applied. The sintering technology of YAG porous ceramics is optimized. Results show that the porosity initially increases and then decreases with an increase of increasing temperature rate, the porosity are decreased with an increase of removing carbon temperature, the porosity are decreased with an increase of sintering temperature, the porosity are decreased with an increase of holding time. Meanwhile, the compressive strength constantly exhibits an opposite tendency. The optimization of the sintering technology of YAG porous ceramics is based on porosity and compressive strength. A good sintering technology are an increasing temperature rate of 8 oC/min, a removing carbon temperature of 800 oC, removing carbon time of 1 h, a sintering temperature of 1450 oC and holding time of 2 h. The porosity of the prepared YAG porous ceramics is 57.4%, and the compressive strength is 8.89 MPa.
The antibacterial effect of xanthorrhizol as an endodontic irrigant on Enterococcus faecalis
Yue, Wonyoung,Song, Minju,Kang, Si-Mook,Kim, Baek-il,Yoon, Tai-Cheol,Kim, Euiseong The Korean Dental Association 2016 대한치과의사협회지 Vol.54 No.3
Objectives The aim of this study was to evaluate the antibacterial effect of xanthorrhizol (XTZ) on E. faecalis, compared with 2% chlorhexidine (CHX). Materials and Methods Normal physiological state (NS), starvation state (SS), and alkalization state (AS) of E. faecalis were used. A solution containing 1% XTZ in 30% ethanol, 1% dimethyl sulfoxide (DMSO), and 100 mg/ml sodium methyl cocoyl taurate was used and is referred to as Xan in this study. To determine the minimal bactericidal concentration (MBC) of Xan and CHX, $500{\mu}l$ of E. faecalis (NS and two stress states) was added to a microtube containing $500{\mu}l$ of serial 2-fold dilutions of 1% Xan and 2% CHX (1:2-1:128). The MBC of each antimicrobial was determined by the plate count method. Results The antibacterial effect of Xan was more effective on E. faecalis in AS than in the other states (NS, SS) at 0.125% Xan and 0.03325% Xan (P<0.05). In contrast, the antibacterial effect of CHX was more effective against E. faecalis in SS than the other states (NS, AS) at 0.0625% CHX (P<0.05). In SS, the antibacterial effect of CHX was more effective than that of Xan at 0.125% and 0.0625% (P<0.05). However, in AS, the antibacterial effect of Xan was more effective than that of CHX at 0.0625% and 0.03325% (P<0.05). Conclusions In endodontic retreatment cases in which it is important to effectively remove E. faecalis from the infected root canal, Xan may be more suitable when combined with NaOCl than CHX.
Simultaneous analysis of thirteen phytohormones in fruits and vegetables by SPE-HPLC–DAD
Song Zhu,Shang-Wei Chen,Yue Li 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.11
Determination of phytohormones have attractedincreasing attentions in food safety field. In this study, anefficient and quantitative method was developed which cansimultaneously determinate thirteen phytohormones infruits and vegetables using solid phase extraction (SPE)combined with high performance liquid chromatography–diode array detection (HPLC–DAD). The samples wereextracted with 80% methanol containing 0.5% (V/V) formicacid, and the extracts were then concentrated andpurified using primary secondary amine (PSA) and C18tandem dual SPE cartridges. The analytes were separatedon a Waters XBridgeTM C18 column and eluated utilizing agradient elution program of water and methanol. Meanrecoveries of the thirteen analytes varied from 74.69 to92.40%, with relative standard deviations\3.57%. Thelimits of detection and quantitation were 0.005–0.018 mg/kg and 0.02–0.10 mg/kg, respectively. The phytohormonesin kiwi fruit, strawberry, bean sprout, and green pepperwere detected using the above method, respectively. Onlythe IAA content of 0.14 mg/kg was detected for thestrawberry from a supermarket, which was lower than theprescribed limit in food safety standards (0.2 mg/kg).
開閉Surge에 의한 PMMA의 異常絶綠破壤에 關한 硏究
송찬일,유병수 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.2
The probability of the occurrence of anomalous breakdown in PMMA under switching surge voltages was investigated experimentaly in this paper. The anomalous breakdown is statistical in nature, and the times for anomalous breakdowns are longer than the times for direct breakdowns. During the experiments, it was resulted that the location of anomalous breakdown, as measured from the high voltage electrode, was furder away with negative switching surge voltage than with positive voltages. The polarity of switching surge has a profound effect on the distance of breakdown from the high voltage electroude.