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De Quan,신운섭 한국전기화학회 2004 한국전기화학회지 Vol.7 No.2
DeniLiteTM laccase immobilized Pt electrode was used for amperometric detection of some catechol derivatives and o-aminophenol (OAP) derivative by means of substrate recycling. In case of catechol derivatives, the obtained sensitivities are 85, 79 and 57 nA/M with linear ranges of 0.6~30, 0.6~30 and 1~25 M and detection limits (S/N=3) of 0.2, 0.2 and 0.3 M for 3,4-dihydroxycinnaminic acid (3,4-DHCA), 3,4-dihydroxybenzoic acid (3,4-DHBA) and 3,4-dihydroxyphenylacetic acid (3,4-DHPAA), respectively. In case of OAP derivative, the obtained sensitivity is 237 nA/M with linear range of 0.2~15 M and detection limit of 70 nM for 2-amino-4-chlorophenol (2-A-4-CP). The response time (t90%) is about 2 seconds for each substrate and the long-term stability is around 40~50 days for catechol derivatives and 30 days for 2-A-4-CP with retaining 80% of initial activity. The optimal pHs of the sensor for these substrates are in the range of 4.5~5.0, which indicates that stability of the enzymatically oxidized product plays a very important role in substrate recycling. The different sensitivity of the sensor for each substrate can be explained by the electronic effect of the substituent on the enzymatically oxidized form.
An active learning hybrid reliability method for positioning accuracy of industrial robots
Dequan Zhang,Song Liu,Jinhui Wu,Yimin Wu,Jie Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
Popsitioning accuracy is an important index for evaluating the capacity of industrial robots. As a mechanism with multi-degree of freedom, the uncertainties of industrial robots are diverse and analyzing the positioning accuracy reliability is time consuming. To improve computation efficiency, a new active learning method based on Kriging model is proposed for hybrid reliability analysis of positioning accuracy with random and interval variables. In this study, the updated samples were selected through U learning function in the vicinity of limit-state function. A new stopping criterion based on expected risk function was exploited to judge whether the accuracy of Kriging model is enough. Two numerical examples and one engineering example were provided to verify the efficiency and accuracy of the proposed method. The results indicate that the proposed method is accurate and efficient.
Dequan Zhao,Yuchao Wang,Lijia Xu,Hansheng Wu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3
The problems of robust stabilization and adaptive robust controller design are considered for a class of uncertain neutral systems with time delays and nonlinear uncertainties. In this paper, Pade approximation is used to deal with input-delays, and the adaptation laws are proposed to estimate the norm of the unknown parameter uncertainties. Based on the improved Razumikhin-type theorem and the updated values, a class of delay-independent adaptive robust state feedback controllers is constructed to guarantee the uniform ultimate boundedness of uncertain neutral systems with input-delays and nonlinear uncertainties. Finally, the chemical two-stage dissolution tank is used to illustrate the effectiveness of the proposed method.
Yue Ge,Dequan Zhang,Huimin Zhang,Xin Li,Fei Fang,Ce Liang,Zhenyu Wang 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.5
To investigate the effect of postmortem phases on lamb meat quality, the physicochemical quality, microstructure and water mobility of oyster cut, short loin, knuckle and silverside muscles from Small-Tail Han sheep were evaluated in the pre-rigor, rigor mortis and post-rigor phases. Pre-rigor lamb meat had higher pH and water holding capacity (WHC), whereas lower CIE L*, b*, hue angle values than rigor mortis and postrigor meat (p<0.05). The Warner-Bratzler shear force (WBSF) values were higher in rigor mortis short loin and silverside than their pre-rigor and post-rigor counterparts, pre-rigor short loin had lower WBSF value than its post-rigor counterpart (p<0.05). Muscle fibers shrank laterally and longitudinally during the onset of rigor mortis. Rigor mortis and postrigor lamb meat exhibited wide I-bands, dark A-bands, short sarcomeres and large intermyofibrillar spaces. The shift of immobilized water to free water and repulsion from the intra-myofibrillar space to the extracellular space result in the increase of water loss in rigor mortis and post-rigor lamb meat. The results of the principal component analysis (PCA) indicated that rigor mortis and post-rigor lamb meat had similar quality properties but different from pre-rigor lamb meat. In conclusion, the lamb meat in the pre-rigor phase had good tenderness, color and WHC. The results of this research could provide some theoretical references for lamb meat production and processing.
Ce Liang,Dequan Zhang,Xiaochun Zheng,Xiangyuan Wen,Tongjing Yan,Zhisheng Zhang,Chengli Hou 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.3
This study was aimed to compare the physicochemical properties and bacterial community structure of tray‐packaged fresh lamb meat under different storage temperatures, such as 4℃ (chilling), –1.5℃ (supercooling), –4℃ (superchilling) and –9℃ (sub-freezing). The total viable counts (TVC), total volatile base nitrogen (TVB-N), bacterial diversity and metabolic pathways were investigated. The results indicated that the shelf life of superchilling and sub-freezing storage was over 70 d, which was significantly longer than that of chilling and supercooling storage. TVC and TVB-N values showed an increasing trend and were correlated well (R2>0.92). And the TVB-N values of lamb meat were exceeded the tolerable limit (15 mg/100 g) only found under chilling and supercooling storage during storage period. At the genus level, Pseudomonas was the core spoilage bacteria then followed Brochothrix for chilling and supercooling storage. Pseudomonas, Ralstonia, Psychrobacter and Acinetobacter were the dominant spoilage bacteria for superchilling and sub-freezing storage. Furthermore, the bacterial community diversity of lamb meat stored at chilling and supercooling storage decreased with the storage time prolonged, which was opposite to the outcome of meat stored under superchilling and sub-freezing storage. For chilling and supercooling storage, the abundance of main metabolisms (carbohydrate metabolism and amino acid metabolism, etc.) of bacteria increased with the storage time prolonged, which was opposite to superchilling storage. This may be related to the bacteria community diversity and the formation of dominant spoilage bacteria. In conclusion, this work provides data for the preservation of fresh lamb meat which will benefit the meat industry.
A Queuing Model of the N-design Multi-skill Call Center with Impatient Customers
Chunyan Li,Dequan Yue 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.4
This paper studies a queuing model of the N-design multi-skill call center. In this model, there are two types of customers and two server groups who have different skills. Group 1 consists of specialized servers who can only serve one type of customers, Group 2 consists of flexible servers who can serve both two types of customers. The customers waiting for the service in the queue may leave the system due to impatience. By dividing the system’s state space into several sets of sates, we obtain the equilibrium equations and the steady-state probabilities of the system. We also obtain the computational formula of the service level and the computational procedure of the staffing problem.
Pokharel, Pashupati,Xiao, Dequan,Erogbogbo, Folarin,Keles, Ozgur,Lee, Dai Soo Elsevier 2019 Composites. Part B, Engineering Vol.161 No.-
<P><B>Abstract</B></P> <P>Hierarchical organization of carbon nanomaterials is the best strategy to combine desirable factors and synergistically impart mechanical and electrical properties to polymers. Here, we investigate the relaxation behavior of carbon nanofillers filled polyurethane (PU) with special reference to particle size and aspect ratio, filler morphology, filler loading to understand the conductive network formation of fillers in the PU matrix. Typically, an addition of 2 wt% hybrid fillers of graphene nanoplatelets (GNPs), conductive carbon black (CB) and multi-walled carbon nanotubes (MWCNTs) in PU at 1:1:2 mass ratio (GCM112-PU2) showed lowest surface resistivity ∼10<SUP>6.8</SUP> Ω/sq along with highest improved mechanical properties. Our results demonstrate how hierarchical compositions may function in polymer configurations that are useful for thermal and electrical systems.</P>
Yejun Zhang,Xin Li,Dequan Zhang,Chi Ren,Yuqiang Bai,Muawuz Ijaz,Xu Wang,Yingxin Zhao 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.4
The objective of this study was to examine the relationship between meat quality attributes and the changes of sarcoplasmic protein acetylation and myofibrillar protein acetylation in lamb longissimus thoracis et lumborum muscles at different postmortem phases. Protein acetylation, color, pH, shear force, myofibril fragmentation index and cooking loss were measured. The total level of acetylated sarcoplasmic proteins showed a negative relation with pH, a positive relation with a*, b* and cooking loss at the pre-rigor phase. Sarcoplasmic proteins acetylation affected postmortem pH by regulating glycolysis, which in turn affects color and cooking loss. The total level of acetylated myofibrillar proteins showed a positive relation with shear force at the pre-rigor phase. Myofibrillar proteins acetylation affected meat tenderness by regulating muscle contraction. This study indicated that acetylation played a regulatory role of meat color, water-holding capacity, and tenderization process at early postmortem.