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Dandan Zhou,Qingxi Hou,Wei Liu,임효례 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
A headspace gas chromatography (HS-GC) method is developed for determination of formic acid (FA) andacetic acid (AA) in biomass hydrolysate. The method is based on the “in-vial” derivatization reaction ofalcohols and acids. NaHSO4/ethanol is selected as the preferred derivatization reagent. The method has areproducibility of RSD <0.87% and recovery of 97.1%–103.1%. The limits of the quantification were2.02 and 2.38 mg/L for FA and AA, respectively. The GC analysis time only required 12.4 min. The methodis rapid, sensitive and suitable for measuring FA and AA in the multifarious biomass hydrolysates inpulping and biorefinery industries.
Dandan Han,Tao Zhu,노경호 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
An ionic liquid-based ultrasonic-assisted extraction method has been successfully applied to the effective extraction of phenolic compounds from Laminaria japonica Aresch. Three kinds of 1-alkyl-3-methylimidazolium with different cations and anions were evaluated for extraction efficiency. The results showed that both the characteristics of anions and cations have remarkable effects on the extraction efficiency. In addition,the ionic liquid-based ultrasonic-assisted extraction procedure was also optimized on some extraction parameters, such as ultrasonic power, extraction time and solid-liquid ratio. Compared with the conventional solvent, the optimum approach gained the highest extraction efficiency within the shortest extraction time. Average recoveries of phenolic compounds were from 75.5% to 88.3% at three concentration levels.
Dandan Wang,Guang Zhang,Vahab Sarfarazi,Hadi Haeri,A.A. Naderi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.3
Experimental and discrete element method were used to investigate the effects of joint number and its angularities on the shear behaviour of joint’s bridge area. A new shear test condition was used to model the gypsum cracks under shear loading. Gypsum samples with dimension of 120 mm×100 mm×50 mm were prepared. the length of joints was 2cm. in experimental tests, the joint number is 1, 2 and 3 and its angularities change from 0° to 90° with increment of 45°. Assuming a plane strain condition, special rectangular models are prepared with dimension of 120 mm×100 mm. similar to joints configuration in experimental test, 9 models with different joint number and joint angularities were prepared. This testing show that the failure process is mostly governed by the joint number and joint angularities. The shear strengths of the specimens are related to the fracture pattern and failure mechanism of the discontinuities. The shear behaviour of discontinuities is related to the number of induced tensile cracks which are increased by increasing the rock bridge length. The strength of samples decreases by increasing the joint number and joint angularities. Failure pattern and failure strength are similar in both of the experimental test and numerical simulation.
Structural Studies of G Protein-Coupled Receptors
Dandan Zhang,Beili Wu,Qiang Zhao 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.10
G protein-coupled receptors (GPCRs) constitute the largest and the most physiologically important membrane protein family that recognizes a variety of environmental stimuli, and are drug targets in the treatment of numerous diseases. Recent progress on GPCR structural studies shed light on molecular mechanisms of GPCR ligand recognition, activation and allosteric modulation, as well as structural basis of GPCR dimerization. In this review, we will discuss the structural features of GPCRs and structural insights of different aspects of GPCR biological functions.
QoS-Based and Network-Aware Web Service Composition across Cloud Datacenters
( Dandan Wang ),( Yang Yang ),( Zhenqiang Mi ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
With the development of cloud computing, more and more Web services are deployed on geo-distributed datacenters and are offered to cloud users all over the world. Through service composition technologies, these independent fine-grain services can be integrated to value-added coarse-grain services. During the composition, a number of Web services may provide the same function but differ in performance. In addition, the distribution of cloud datacenters presents a geographically dispersive manner, which elevates the impact of the network on the QoS of composite services. So it is important to select an optimal composition path in terms of QoS when many functionally equivalent services are available. To achieve this objective, we first present a graph model that takes both QoS of Web services and QoS of network into consideration. Then, a novel approach aiming at selecting the optimal composition path that fulfills the user`s end-to-end QoS requirements is provided. We evaluate our approach through simulation and compare our method with existing solutions. Results show that our approach significantly outperforms existing solutions in terms of optimality and scalability.
Fashionable styles and information sources: an exploratory study of Hangzhou, China
Dandan Chen,하지수 한국의류학회 2016 Fashion and Textiles Vol.3 No.1
The exploratory study aims to examine Hangzhou fashion in the context of globalization and localization through in-depth interviews. Sixteen young females from Hangzhou were interviewed. In the 1990s young females from Hangzhou had a weak concept of fashionable style and they just had a preference for the feminine style, which is derived from a regional culture. In the 2010s, young females’ concept regarding fashion have changed from fashionable (时髦) to stylish (有型), leading to a variety of fashionable styles. The popular Korean, European and minimalist styles mostly originate from foreign dramas and fashion advertisements from the Internet. This qualitative research verified that there was a diminishing sense of locality and cultural identity in young females’ fashion in Hangzhou. However, the impact of globalcultural eclecticism and mass media imagery appears larger for young females’ fashion in the city, especially through the Internet, especially in the spread of SNS, online shopping malls, and online video sites. Therefore, fashion brands should expand the brand culture influence through online media. Presently, the mobile apps in Hangzhou such as Wechat and Instagram may be the most helpful tool for brand culture spreading.
Evaluation of Water Environment Performance Based on a DPSIR-SBM-Tobit Model
Dandan Zhang,Juqin Shen,Fu-hua Sun 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
Environmental problems – specifically relating to water – have become the key factors restricting sustainable development. To evaluate the performance of water environment, this study takes 31 provinces in China as the research area and constructs a water environment performance evaluation index system based on a DPSIR framework (Drivers, Pressures, State, Impact and Response). The undesirable output slack measure model (SBM) is used to calculate the water environment performance of 31 provinces from 2005 to 2017. According to the study, the performance of the water environment in China shows a trend of decline, and the overall performance is low. The water environment performance in different provinces shows obvious differences. The Tobit model is then introduced to analyze the influence of indicators on water environment efficiency. The driving force indicators have significant negative effects on water environment performance. The pressure indicators have significant positive effects on the water environment performance. The state indicators play a significant role in promoting the improvement of water environment performance. With regard to the impact indicators, both industrial added value water consumption and GDP growth rate have significant negative effects on water environment performance. The impact of different response measures on water environment performance is inconsistent.