Adaptive-and-Resolvable Fractional Repetition Codes Based on Hypergraph

Tiantian Wang,Jing Wang,Haipeng Wang,Jie Meng,Chunlei Yu,Shuxia Wang 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.4

Fractional repetition (FR) codes can achieve exact uncoded repair for multiple failed nodes, with lower computational complexity and bandwidth overhead, and effectively improve repair performance in distributed storage systems (DSS). The actual distributed storage system is dynamic, that is, the parameters such as node storage overhead and number of storage nodes will change randomly and dynamically. Considering that traditional FR codes cannot be flexibly applied to dynamic distributed storage systems, a new construction scheme of adaptive-and-resolvable FR codes based on hypergraph coloring is proposed in this paper. Specifically, the linear uniform regular hypergraph can be constructed based on the heuristic algorithm of hypergraph coloring proposed in this paper. Then edges and vertices in hypergraph correspond to nodes and coded packets of FR codes respectively, further, FR codes is constructed. According to hypergraph coloring, the FR codes can achieve rapid repair for multiple failed nodes. Further, FR codes based on hypergraph coloring can be generalized to heterogeneous distributed storage systems. Compared with Reed-Solomon (RS) codes, simple regenerating codes (SRC) and locally repairable codes (LRC), adaptive-and-resolvable FR codes have significant advantages over repair locality, repair bandwidth overhead, computational complexity and time overhead during repairing failed nodes.

Effect of acid sites on catalytic destruction of trichloroethylene over solid acid catalysts

Tiantian Wang,Qiguang Dai,Fuwu Yan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3

The catalytic destruction of trichloroethylene (TCE) over several solid acid catalysts (HZSM-5, γ-Al2O3 and SBA-15/P) was evaluated under dry conditions. The activity order was found to be: HZSM-5>SBA-15/P>γ-Al2O3. It was reported that Brønsted and Lewis acid sites of catalysts both played an important role on TCE catalytic destruction, while the Brønsted acid sites were more decisive. Additionally, the formation of the polychlorinated by-product (tetrachloroethylene, PCE) over HZSM-5 and γ-Al2O3 catalysts was observed and attributed to the presence of Lewis acid sites and basic O2−, and PCE was not detected over SBA-15/P catalyst due to the presence of only Brønsted acid sites. The TCE/O2- TPSR studies demonstrated that the main oxidation products during TCE catalytic destruction are CO, CO2 and Cl2, and the carbon in TCE was firstly converted to CO and then further oxidized into CO2 by gas phase O2.

ANALYSING THE INFLUENCE OF EMOJIS ON CONSUMERS’ RELATIONSHIP PERCEPTION AND PURCHASE INTENTION

Tiantian Wang,K. Nadia Papamichail,Sahar Karimi 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07

Emojis have become an important element in human-chatbot interaction to communicate emotion. In addition to facilitating emotional communication, emojis are able to engage consumers, enhance relationship strength and influence consumer behavioural intention. Therefore, it is crucial to understand how the use of emojis affects customer-chatbot rapport and purchase intention in the consumption context.

MODEL-BASED NH3 ADAPTATION METHOD FOR SCR CONTROL

Tiantian Wang,Zhichao Huang,Xuwei Luo,Jie Hu,Zhi Wang,Yayu Cheng 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.6

Selective Catalytic Reduction (SCR) system is widely used for diesel nitrogen oxide (NOx) control, but the closed-loop control and adaptive correction method which based on NOx sensor signal will be affected by the working characteristics of NOx sensor, such as the cross-sensitivity of ammonia (NH3). Based on the highly linear correlation between conversion efficiency and ammonia to NOx ratio (ANR) at insufficient supply level, a model-based adaptive correction method for urea injection quantity is proposed to eliminate this effect, which can effectively correct the deviation caused by multiple sources when using accurate models. The difference between the conversion efficiency of current SCR system and which generated from model is calculated by stopping injection and under injection actions to obtain an accurate adaptation factor, and the basic injection quantity can be modified by this factor. The maximum error of the 18 calculated correction factors from 18 WHTC cycles is only 1.1 % when using standard AdBlue; After urea solution concentration changed, the calculated correction factor error is within 5 % when comparing with the theoretical correction factor after 2 ~ 3 rounds adaptation function running. The adaptation function keeps the reductant supply to adapt the deviation caused by catalyst aging, reductant concentration drift and supply accuracy variation only with slightly influence of tailpipe NOx emission (less than 2 % in average), which ensure SCR system always stay in appropriate dosing control state, make best for NOx emissions and NH3 emissions control.

A novel CMOS image sensor system for quantitative loop-mediated isothermal amplification assays to detect food-borne pathogens

Wang, Tiantian,Kim, Sanghyo,An, Jeong Ho Elsevier Biomedical 2017 Journal of microbiological methods Vol.133 No.-

<P><B>Abstract</B></P> <P>Loop-mediated isothermal amplification (LAMP) is considered as one of the alternatives to the conventional PCR and it is an inexpensive portable diagnostic system with minimal power consumption. The present work describes the application of LAMP in real-time photon detection and quantitative analysis of nucleic acids integrated with a disposable complementary-metal-oxide semiconductor (CMOS) image sensor. This novel system works as an amplification-coupled detection platform, relying on a CMOS image sensor, with the aid of a computerized circuitry controller for the temperature and light sources. The CMOS image sensor captures the light which is passing through the sensor surface and converts into digital units using an analog-to-digital converter (ADC). This new system monitors the real-time photon variation, caused by the color changes during amplification. <I>Escherichia coli</I> O157 was used as a proof-of-concept target for quantitative analysis, and compared with the results for <I>Staphylococcus aureus</I> and <I>Salmonella enterica</I> to confirm the efficiency of the system. The system detected various DNA concentrations of <I>E. coli</I> O157 in a short time (45min), with a detection limit of 10fg/μL. The low-cost, simple, and compact design, with low power consumption, represents a significant advance in the development of a portable, sensitive, user-friendly, real-time, and quantitative analytic tools for point-of-care diagnosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel CMOS-based LAMP system as molecular diagnosis of pathogens </LI> <LI> Successful in real-time photon detection and quantitative analysis of nucleic acids </LI> <LI> Low cost, user friendly, simple with low power consumption technology </LI> <LI> Successful in detecting various concentrations DNA within short period </LI> </UL> </P>

Establishment and Application of Target Gene Disruption System in Saccharomyces boulardii

Longjiang Wang,Hui Sun,Jie Zhang,Qing Liu,Tiantian Wang,Peipei Chen,Hongmei Li,Yihong Xiao,Fangkun Wang,Xiaomin Zhao 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1

Saccharomyces boulardii is the best knownprobiotic yeast, widely used as a therapeutic agent for thetreatment or prevention of diarrhea and intestine disorders. In the present work, we established a target gene disruptionsystem for S. boulardii based on the Cre-loxP system usedfor S. cerevisiae and other fungi by screening out selectionmarkers, working out the transformation method, andconstructing essential plasmids for S. boulardii. Theestablished system was successfully applied to the URA3gene disruption and created an ura3 null mutant strain ofS. boulardii. The system can be used for PCR mediatedgene disruption, cloning mediated gene disruption, andreintroduction of the deleted gene back to the mutant. Allthe introduced exogenous DNAs in the gene disruptionprocedures were removed from the final mutant strainexcept the two 34 bp loxP pieces left in deleted gene loci.

Phylogenetic and Morphological Identification of the Novel Pathogen of Rheum palmatum Leaf Spot in Gansu, China

( Yan Wang ),( Amy O. Charkowski ),( Cuiyun Zeng ),( Tiantian Zhu ),( Huizhen Wang ),( Honggang Chen ) 한국균학회 2016 Mycobiology Vol.44 No.2

A new leaf spot disease was observed on leaves of Rheum palmatum (Chinese rhubarb) in Northwest China (Gansu Province) starting in 2005. A Septoria-like fungus was isolated and completion of Koch’s postulates confirmed that the fungus was the casual agent of the leaf spot disease. Morphology and molecular methods were combined to identify the pathogen. The fungus produced conidiomata pycnidia and the conidia were 2~5 septate, 61.2~134.1 μm in length and 3.53~5.3 μm in width, which is much larger than the known Spetoria species that infects Polygonaceae species. Phylogenic analysis of the internal transcribed spacer region confirmed that this Septoria-like fungus is within the Septoria genus but distinct from known Septoria species. Together, these morphological and phylogenetic data support that the R. palmatum infecting Septoria strain is a newlydescribed plant pathogenic species.

Minimum Bandwidth Regenerating Codes Based on Cyclic VFR Codes

( Jing Wang ),( Shuxia Wang ),( Tiantian Wang ),( Xuefei Zhang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.7

In order to improve the reliability and repair efficiency of distributed storage systems, minimum bandwidth regenerating (MBR) codes based on cyclic variable fractional repetition (VFR) codes are constructed in this thesis, which can repair failed nodes accurately. Specifically, in order to consider the imbalance of data accessed by the users, cyclic VFR codes are constructed according to that data with different heat degrees are copied in different repetition degrees. Moreover, we divide the storage nodes into groups, and construct MBR codes based on cyclic VFR codes to improve the file download speed. Performance analysis and simulation results show that, the repair locality of a single node failure is always 2 when MBR codes based on cyclic VFR codes are adopted in distributed storage systems, which is obviously superior to the traditional MBR codes. Compared with RS codes and simple regenerating codes, the proposed MBR codes based on cyclic VFR codes have lower repair locality, repair complexity and bandwidth overhead, as well as higher repair efficiency. Moreover, relative to FR codes, the MBR codes based on cyclic VFR codes can be applicable to more storage systems.

Screening and Identification of Antigenic Proteins from the Hard Tick Dermacentor silvarum (Acari: Ixodidae)

Tiantian Zhang,Xuejiao Cui,Jincheng Zhang,Hui Wang,Meng Wu,Hua Zeng,Yuanyuan Cao,Jingze Liu,Yonghong Hu 대한기생충학열대의학회 2015 The Korean Journal of Parasitology Vol.53 No.6

In order to explore tick proteins as potential targets for further developing vaccine against ticks, the total proteins of unfed female Dermacentor silvarum were screened with anti-D. silvarum serum produced from rabbits. The results of western blot showed that 3 antigenic proteins of about 100, 68, and 52 kDa were detected by polyclonal antibodies, which means that they probably have immunogenicity. Then, unfed female tick proteins were separated by 12% SDS-PAGE, and target proteins (100, 68, and 52 kDa) were cut and analyzed by LC-MS/MS, respectively. The comparative results of peptide sequences showed that they might be vitellogenin (Vg), heat shock protein 60 (Hsp60), and fructose-1, 6-bisphosphate aldolase (FBA), respectively. These data will lay the foundation for the further validation of antigenic proteins to prevent infestation and diseases transmitted by D. silvarum.

Automatic identification and analysis of multi-object cattle rumination based on computer vision

Yueming Wang,Tiantian Chen,Baoshan Li,Qi Li 한국축산학회 2023 한국축산학회지 Vol.65 No.3

Rumination in cattle is closely related to their health, which makes the automatic monitoring of rumination an important part of smart pasture operations. However, manual monitoring of cattle rumination is laborious and wearable sensors are often harmful to animals. Thus, we propose a computer vision-based method to automatically identify multi-object cattle rumination, and to calculate the rumination time and number of chews for each cow. The heads of the cattle in the video were initially tracked with a multi-object tracking algorithm, which combined the You Only Look Once (YOLO) algorithm with the kernelized correlation filter (KCF). Images of the head of each cow were saved at a fixed size, and numbered. Then, a rumination recognition algorithm was constructed with parameters obtained using the frame difference method, and rumination time and number of chews were calculated. The rumination recognition algorithm was used to analyze the head image of each cow to automatically detect multi-object cattle rumination. To verify the feasibility of this method, the algorithm was tested on multi-object cattle rumination videos, and the results were compared with the results produced by human observation. The experimental results showed that the average error in rumination time was 5.902% and the average error in the number of chews was 8.126%. The rumination identification and calculation of rumination information only need to be performed by computers automatically with no manual intervention. It could provide a new contactless rumination identification method for multi-cattle, which provided technical support for smart pasture.