Coding-based Storage Design for Continuous Data Collection in Wireless Sensor Networks

Cheng Zhan,Fuyuan Xiao 한국통신학회 2016 Journal of communications and networks Vol.18 No.3

In-network storage is an effective technique for avoidingnetwork congestion and reducing power consumption in continuousdata collection in wireless sensor networks. In recent years,network coding based storage design has been proposed as a meansto achieving ubiquitous access that permits any query to be satisfiedby a few random (nearby) storage nodes. To maintain dataconsistency in continuous data collection applications, the readingsof a sensor over time must be sent to the same set of storagenodes. In this paper, we present an efficient approach to updatingdata at storage nodes to maintain data consistency at thestorage nodes without decoding out the old data and re-encodingwith new data. We studied a transmission strategy that identifiesa set of storage nodes for each source sensor that minimizes thetransmission cost and achieves ubiquitous access by transmittingsparsely using the sparse matrix theory. We demonstrate that theproblem of minimizing the cost of transmission with coding is NPhard. We present an approximation algorithm based on regardingevery storage node with memory size B as B tiny nodes that canstore only one packet. We analyzed the approximation ratio of theproposed approximation solution, and compared the performanceof the proposed coding approach with other coding schemes presentedin the literature. The simulation results confirm that signifi-cant performance improvement can be achieved with the proposedtransmission strategy.

Comparative Study on the Supramolecular Nanocarriers Derived from the Assembly of Gemini and Conventional Surfactants onto Hyperbranched Polyethylenimine

Zhan-Long Yu,Fa Cheng,Shao-Jing Zhao,Jian-Wei Zhang,Zu-Cheng Cai,Yu Chen 한국고분자학회 2011 Macromolecular Research Vol.19 No.2

Conventional surfactant dodecylbenzenesulfonic acid (DBSA) and its corresponding Gemini surfactant acid (GSA) were simply mixed with a solution of hyperbranched polyethylenimine (HPEI) in chloroform. This resulted in the novel supramolecular complexes, HPEI-DBSA and HPEI-GSA, through a neutralization reaction between the amino groups of HPEI and the sulfonic-acid groups of DBSA and GSA. The formed supramolecular complexes and their precursors were characterized by FTIR, 1H NMR, and dynamic light scattering. HPEI-DBSA and HPEI-GSA exhibited inverted-micelle properties that could accommodate the water-soluble guest molecules in an apolar solvent. With the anionic dye methyl orange (MO) as the model guest, both HPEI-DBSA and HPEI-GSA showed superior guest-encapsulation performance than the supramolecular nanocarrier derived from the assembly of aliphatic acid onto HPEI. For example, HPEI-DBSA and HPEI-GSA nanocarriers could encapsulate more MO molecules, and a much smaller amount of the surfactant molecules was required to achieve the maximum MO encapsulation. These results highlight the importance of strong-acid groups of the surfactants in raising the guest-encapsulation efficiency of this type of supramolecular nanocarrier. HPEI-DBSA and HPEI-GSA had different guestencapsulation mechanisms. This indicates that HPEI-GSA can encapsulate basic guests more than HPEI-DBSA,such as MO and fluorescein sodium (FS), but fewer relatively acidic guests, such as Alizarin Yellow R sodium salt and bromophenol blue.

Evaluation of the Stability of Aspirin in Solid State by the Programmed Humidifying and Non-isothermal Experiments

Zhan, Xian-Cheng,Tao, Jian-Lin,Li, Lin-Li 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.3

single pair of experiments, one with programmed humidity control and the other non-isothermal, rather than many standard isothermal studies, each at constant relative humidity. In experiments, we adopted the acid-base back titration method to measure the content of aspirin in the presence of its degradation products. It was found that the degradation of aspirin could be expressed as In[($C_o-c$)/c]=kt+D, where D was a lag time item not related to humidity and temperature. The relationship between the degradation rate constant k and humidity $H_r$, and temperature T could be described as Arrhenius equation multiplied by an exponential item of relative humidity: k= A . exp($mH_r$)${\cdot}$exp(-($E_a/RT$)), where A, $E_a$ and m were the pre-exponential factor, observed activation energy, and a parameter related to humidity, respectively. The results obtained from the programmed humidifying and non-isothermal experiments, A=$(1.09{\pm}2.04){\times}10^{12}\;h^{-1}$, $E_a=(93.5{\pm}2.2)\;kJ{\cdot}mol^{-1}$ and m=$1.18{\pm}O.19$, were comparable to those from isothermal studies at constant humidity, A=$(1.71{\pm}o.35){\times}10^{12}\;h^{-1}$, $E_a=(94.9{\pm}0.7)\;kJ{\cdot}mol^{-1}$ and m=$1.20{\pm}0.02$. Since the programmed humidifying and non-isothermal experiments save time, labor and materials, it is suggested that the new experimental method can be used to investigate the stability of drugs unstable to both moisture and heat, instead of many classical isothermal experiments at constant humidity.

Safety of nighttime elective hepatectomy for hepatocellular carcinoma patients: a retrospective study

Zhan-cheng Qiu,You-wei Wu,Wei-li Qi,Chuan Li 대한외과학회 2024 Annals of Surgical Treatment and Research(ASRT) Vol.106 No.2

Purpose: This study aimed to investigate whether nighttime elective surgery influenced the short-term outcomes and prognosis of hepatocellular carcinoma (HCC) patients. Methods: The 1,339 HCC patients who underwent hepatectomy were divided into the daytime surgery group (8 a.m.–6 p.m., n = 1,105) and the nighttime surgery group (after 6 p.m., n = 234) based on the start time of surgery. The 1:2 propensity score matching (PSM) analysis was used to control confounding factors. The short-term outcomes of HCC patients in the 2 groups were compared before and after PSM. Factors associated with major complications (Clavien-Dindo grade, ≥III) and textbook oncologic outcomes (TOO) were separately identified by multivariable logistic regression based on variables screened via least absolute shrinkage and selection operator (LASSO). The Kaplan-Meier method was used to analyze overall survival (OS) and recurrence-free survival (RFS). Results: TOO was achieved after surgery in 897 HCC patients. HCC patients in the nighttime surgery group had a higher body mass index (P = 0.010). After 1:2 PSM, the baseline characteristics of patients between the 2 groups were similar. Short-term outcomes in HCC patients were comparable both before and after PSM (all Ps > 0.05), as were TOO in the 2 groups before (P = 0.673) and after PSM (P = 0.333). In our LASSO-logistic regression, nighttime surgery was not an independent factor associated with major complications or TOO. Both groups also had similar OS (P = 0.950) and RFS (P = 0.740) after PSM. Conclusion: Our study revealed the safety of nighttime elective hepatectomy for HCC patients.

The fabrication of tungsten oxide layers on pure Al substrate by plasma electrolytic oxidation in sodium tungstate based electrolytes

Tingyan Zhan,Wenbin Tu,Yulin Cheng,Junxiang Han,Bin Su,Yingliang Cheng 한국표면공학회 2017 한국표면공학회 학술발표회 초록집 Vol.2017 No.11

An Interactionist Perspective: Establishing Humanistic Quality Cultivation Platform Contented With Sports Literature in Sport Colleges

( Zhan Bing ),( Cheng Hao ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: In China the humanistic education among college students is always put into priority. Especially for some students in sport colleges humanistic education seems more important since they didn`t received comprehensive and systematic education before enrolled by colleges for the overemphasis on long-term and intensive sports training outside to improve the skills at the expense of learning knowledge in class. However, since 1999 Chinese government has launched a series of policy to reinforce the education reform and enhance the quality education in colleges. This paper aims to elaborate the understanding of humanistic quality, sports literature in China via taking an interactionist perspective. It also put forwards the ways by which improve the monotonous mode of humanistic quality cultivation in Chinese sports colleges or universities. Method: By literature review, it expounds the three definitions: interactionist theory, humanistic quality in China, and sport literature to illustrate the possibility and effectiveness of sports literature in cultivating humanistic quality among college students. By questionnaire, the author made a survey of the courses mode in Chinese sports colleges to reveal the embarrassing present situation about humanistic quality education. Result: In the author`s view, humanistic quality refers to basic characters relating to morality, interpersonal relationship, Intellectual perspective, and ideal pursuit. By learning knowledge such as language, literature works, art, philosophy and history, college students develop stable and noble character via understanding and practice, which representing by behavioral tendency, personality and aesthetic taste. The mode of humanistic quality cultivation nowadays in Chinese sports colleges or universities tends to be monotonous nationwide. The humanities studies are taught in forms of public compulsory courses or optional courses. The first focuses on politics course, basic courses such as English, Chinese, and Computer; sports humanities course such as sports history, sports sociology, sports aesthetics, and public relations etiquette. As to the optional courses, its proportion in all curriculums ranges from 9% to 29.7% from north to Southern part of China. In this paper the basic premise of interactionism is that the ability for humans to communicate is reliant on shared meanings. Language, symbols and images play a central role in the communication process and the organization of social life; and these firstly require that humans develop a sense of their own self and then an awareness of how others might see them***. From the author`s point of view, sports literature is the fictional representation in form of literature which is extracted and refined from sportsmanship by attending sports. It`s possible way to encourage students in understanding and developing a noble character, enrich humanistic knowledge and cultivate positive attitude to life. Conclusion: Goffman once argued that "we live in a literally-defined world"****. It`s possible to draw on sports literary works as source of information developing and enhancing the students` humanistic quality. It`s argued that an interactionist framework is particularly helpful for explaining the role of imagination in developing humanistic quality for college students in sports colleges. Enjoying sport literature contributes to develop psychological and communicative capability; enrich their knowledge and improve aesthetic judgment. Featured with sports literature, the paper suggested the trinity mode to set up a platform of cultivating humanistic quality in sport colleges, namely, to open sports literature courses; to open reading salon in library; to encourage literature writing in class and literature associations.

Maximizing Property Tuning of Phosphorus Corrole Photocatalysts through a Trifluoromethylation Approach

Zhan, Xuan,Teplitzky, Peter,Diskin-Posner, Yael,Sundararajan, Mahesh,Ullah, Zakir,Chen, Qiu-Cheng,Shimon, Linda J. W.,Saltsman, Irena,Mahammed, Atif,Kosa, Monica,Baik, Mu-Hyun,Churchill, David G.,Gros ACS AMERICAN CHEMICAL SOCIETY 2019 Inorganic Chemistry Vol.58 No.9

<P>An eight-member series of CF<SUB>3</SUB>-substituted difluorophosphorus corroles was prepared for establishing a structure-activity profile of these high-potential photosensitizers. It consisted of preparing all four possible isomers of the monosubstituted corrole and complexes with 2-, 3-, 4-, and 5-CF<SUB>3</SUB> groups on the macrocycle’s periphery. The synthetic pathway to these CF<SUB>3</SUB>-substituted derivatives, beginning with (<B>tpfc</B>)<B>PF</B><SUB><B>2</B></SUB>, involves two different initial routes: (i) direct electrophilic CF<SUB>3</SUB> incorporation using FSO<SUB>2</SUB>CF<SUB>2</SUB>CO<SUB>2</SUB>Me and copper iodide, or (ii) bromination to achieve the 2,3,8,17,18-pentabrominated compound using excess bromine in methanol. Crystallographic investigations revealed that distortion of the original planar macrocycle is evident even in the monosubstituted case and that it becomes truly severe for the penta-CF<SUB>3</SUB>-substituted derivative <B>5</B>. There is a shift in redox potentials of about 193 mV per -CF<SUB>3</SUB> group, which decreases to only 120 mV for the fifth one in <B>5</B>. Differences in the electronic spectra suggest that the Gouterman four orbital model decreases in relevance upon gradual -CF<SUB>3</SUB> substitution, a conclusion that was corroborated by DFT calculations. The very significant energy lowering of the frontier orbitals suggested that photoexcitation should lead to a highly oxidizing photocatalyst. This hypothesis was proven true by finding that the most synthetically accessible CF<SUB>3</SUB>-substituted derivative is an excellent catalyst for the photoinduced conversion of bromide to bromine (phenol, toluene, and benzene assay).</P><P>CF<SUB>3</SUB>-substituted difluorophosphorus corroles were synthesized and studied by CV, NMR spectroscopy, crystallography, and DFT. All four possible isomers of the monosubstituted corrole and complexes with 2-, 3-, 4-, and 5-CF<SUB>3</SUB> groups on the macrocycle’s periphery were prepared. The sterical and electronic role of the -CF<SUB>3</SUB> unit became evident through the study of the 5-CF<SUB>3</SUB> species which was found to be an excellent bromide photocatalyst (photoxidation with phenol, toluene, and benzene assays).</P> [FIG OMISSION]</BR>

LncRNA SNHG12/miR-494-3p/CBX3 axis in diffuse large B-cell lymphoma

Si Cheng,Zhang Wanyong,Han Qi,Zhu Bisheng,Zhan Chengzhi 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.1

Background Diffuse large B-cell lymphoma (DLBCL) is the most common lymphoid malignancy in adults. Current studies have implicated that long non-coding RNAs (lncRNAs) regulate the development of DLBCL; nevertheless, the control method is dim. Here, we reconnoitered the characters of lncRNA small nucleolar RNA host gene 12 (lncRNA SNHG12) in DLBCL. Objective The pathological morphology of tumor tissues and normal tissues was perceived by hematoxylin–eosin (HE) staining. The levels of SNHG12, microRNA-494-3p (miR-494-3p), and chromobox 3 (CBX3) were detected by quantitative real-time PCR and western blot. Whereafter, MTT assay and EdU assay were enforced to validate cell proliferation. Flow cytometry assay was implemented to assess the cell cycle and cell apoptosis, respectively. Additionally, the interface between miR-494-3p with SNHG12 or CBX3 was identified by dual-luciferase reporter assay. Results SNHG12 and CBX3 were enhanced, but miR-494-3p was diminished in DLBCL. Knockdown of SNHG12 repressed cell proliferation and cell cycle, although heightened cell apoptosis in DLBCL cells. SNHG12 sponged miR-494-3p to adjust the CBX3. Additionally, miR-494-3p restrained DLBCL cells development by targeting CBX3. Conclusion SNHG12 contributed to DLBCL development by regulating miR-494-3p/CBX3. The outcomes demonstrated that SNHG12 provided a potential train of thought for DLBCL theory of targeted therapy.

Constructing Microstructures of Chlorinated Polyvinyl Chloride Microporous Membranes by Non-solvent Induced Phase Separation for High Permeate Flux and Rejection Performance

Xiaomei Zhan,Jifeng Cheng,Li Xiang,Huiju Shao,Shuhao Qin 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5

To obtain the excellent permeate flux, rejection performance and mechanical properties, the chlorinated polyvinylchloride (CPVC) porous membrane was fabricated on the polyethylene terephthalate (PET) non-woven fabric by non-solventinduced phase separation (NIPS), using Tween80 (polyoxyethylene sorbitan monooleate) as a hydrophilic surfactant to regulate themicrostructure of the membrane. Porous skin layer and sub-layer were achieved when 3 wt.% Tween80 was added with asmall amount of deionized water as additive, and internal layer consisted of various finger-like holes. The forming mechanism ofmicrostructures was investigated according to the effects of Tween80 molecular chain structure on the viscosity and surface tensionof casting solution. Significantly, the modified membranes obviously exhibited higher pure water flux, which was increasedby 257 % compared with the pristine membrane. The rejection to ink suspension was over 99 %. Furthermore, the antifoulingperformance of modified membrane was also greatly improved on account of the above microstructure and more hydrophilicsurface. This study provides a new idea for the construction of membrane microstructure and the hydrophilic modification.

Adaptive Bipartite Output Containment Control of Heterogeneous Multi-agent Systems Based on Output Regulation Approach

Jie Cheng,Xisheng Zhan,Jie Wu,Huaicheng Yan 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.1

In this paper, the adaptive bipartite output containment problem is investigated, for a signed graph of heterogeneous multi-agent systems (HMASs). An adaptive state feedback algorithm and an output feedback algorithm are designed to ensure that cooperative and antagonistic agents enter different convex hull. A novel protocol is proposed for heterogeneous systems to deal with the bipartite output containment problem, where only the leader’s neighbours can learn the leader’s system matrix without all followers. Then, based on output regulation approach, Lyapunov stability analysis and some other methods guarantee that the bipartite output containment control problem is implemented. Finally, the validity of our analytical results is verified by the numerical simulations provided.