TCP Delayed Window Update Mechanism for Fighting the Bufferbloat

( Min Wang ),( Lingyun Yuan ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10

The existence of excessively large and too filled network buffers, known as bufferbloat, has recently gained attention as a major performance problem for delay-sensitive applications. Researchers have made three types of suggestions to solve the bufferbloat problem. One is End to End (E2E) congestion control, second is deployment of Active Queue Management (AQM) techniques and third is the combination of above two. However, these solutions either seem impractical or could not obtain good bandwidth utilization. In this paper, we propose a Transmission Control Protocol(TCP)delayed window update mechanism which uses a congestion detection approach to predict the congestion level of networks. When detecting the network congestion is coming, a delayed window update control strategy is adopted to maintain good protocol performance. If the network is non-congested, the mechanism stops work and congestion window is updated based on the original protocol. The simulation experiments are conducted on both high bandwidth and long delay scenario and low bandwidth and short delay scenario. Experiment results show that TCP delayed window update mechanism can effectively improve the performance of the original protocol, decreasing packet losses and queuing delay while guaranteeing transmission efficiency of the whole network. In addition, it can perform good fairness and TCP friendliness.

Monocytic Differentiation of K562 Cells Induced by Proanthocyanidins from Grape Seeds

Min Wang,Hongzhang Chen,Li Wang,Xiao-Jing Pan 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.1

Grape seeds procyanidins can inhibit the proliferation of some cancer cell lines and have strong antioxidant activity. The purpose of this study was to investigate whether grape seeds procyanidins affect the proliferation and redifferentiation in K562 cells. The sulforhodamine B colorimetric assay and trypan blue staining were used to measure cell proliferation and survival. Morphological changes, NBT reductive activity, and surface antigens were used to detect redifferentiation of K562 cells. Intracellular reactive oxygen species (iROS) were detected by a fluorescent probe. Grape seeds procyanidins inhibited cell proliferation but the treatment did not appreciably increase lethality. After treatment with grape seeds procyanidins, a typical differentiated morphology was observed. The positive rate of CD11b and CD14 cells and NBT reductive activities increased significantly. As antioxidants, grape seeds procyanidins can induce arrest in the phase G1 and decrease iROS formation. All results indicate that the antioxidant grape seeds procyanidins are likely to induce monocytic differentiation in leukemia cells, mostly through decreasing iROS formation and inducing phase G1 arrest.

Dynamic Output Feedback Robust H_∞ Control of Uncertain Switched Nonlinear Systems

Min Wang,Jun Zhao,Georgi M. Dimirovski 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.1

The problem of robust H∞ control problem for a class of switched nonlinear systems with parameter uncertainty is studied by using single Lyapunov function method. The problem under switch-dependent and switch-independent dynamic output feedbacks is solved respectively. Sufficient conditions for solvability of the problem are obtained. The Lyapunov function and the corresponding switching law are explicitly constructed. A numerical example is given to demonstrate the validity of the proposed approach.

Microstructure and Properties of BaTiO3

Min Wang,Guoge Zhang,Wenfang Li,Xiaojun Wang 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.4

In this paper, we report the preparation of BaTiO3 (BT) ferroelectric films from barium hydroxide via micro arc oxidation (MAO) with additives. The BaTiO3 film was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-Raman spectroscopy, precision LCR measurements, and a Radiant Precision LC material analyzer. The results showed that the BT film was mainly composed of tetragonal-phase BaTiO3 , and the BT film was smooth, dense, and crack-free. At the frequency of 100 Hz, the film was found to possess a high dielectric constant of 245.3 and a low dielectric loss (tan δ) of 0.039. Compared with the BT film prepared without additives, the MAO-prepared film showed an increase of 61.1% in dielectric constant and a decrease of 59.4% in dielectric loss (tan δ). The BT film exhibited a saturated P–E hysteresis loop at room temperature.

On-the-fly Data Compression for Efficient TCP Transmission

( Min Wang ),( Junfeng Wang ),( Xuan Mou ),( Sunyoung Han ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.3

Data compression at the transport layer could both reduce transmitted bytes over network links and increase the transmitted application data (TCP PDU) in one RTT at the same network conditions. Therefore, it is able to improve transmission efficiency on Internet, especially on the networks with limited bandwidth or long delay links. In this paper, we propose an on-the-fly TCP data compression scheme, i.e., the TCPComp, to enhance TCP performance. This scheme is primarily composed of the compression decision mechanism and the compression ratio estimation algorithm. When the application data arrives at the transport layer, the compression decision mechanism is applied to determine which data block could be compressed. The compression ratio estimation algorithm is employed to predict compression ratios of upcoming application data for determining the proper size of the next data block so as to maximize compression efficiency. Furthermore, the assessment criteria for TCP data compression scheme are systematically developed. Experimental results show that the scheme can effectively reduce transmitted TCP segments and bytes, leading to greater transmission efficiency compared with the standard TCP and other TCP compression schemes.

Clonal Isolation and Characterization of Mesenchymal Stem Cells from Human Amnion

Min Wang,Yan Zhou,Wen-Song Tan 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.6

Mesenchymal stem cells (MSCs) derived from human amnion have both self-renewal capability and multipotency and are an attractive cell source for cell-based therapy. However, these cells have been shown to be heterogeneous, and as of yet no single-cell-derived MSCs clone has been established from human amnion. This study was carried out to isolate MSCs clones by limiting dilution method and compare their characteristics in vitro. Three clones (namely, 8B, 11D, and 11F) were established from a heterogeneous population of human amnion-derived cells (h-hAMCs). The clones and h-hAMCs successfully proliferated while demonstrating different cumulative population doublings (CPD) during an 80-day culture. In addition, the colony-forming efficiency (CFE) of h-hAMCs was significantly lower than those of 8B and 11F and higher than that of 11D. Clones 8B and 11F were tripotent,whereas 11D did not undergo chondrogenic differentiation. All cells expressed surface markers including CD29,CD44, and CD105 and notably, the clones expressed higher levels of CD105 than h-hAMCs (95.96, 97.05, 98.14% and 72.81% for 8B, 11D, 11F and h-hAMCs, respectively). In addition, the expression of stem cell gene Nanog-3 was associated with the differential differentiation potential of 11D from 8B, 11F, and h-hAMCs. These results suggested that significant differences existed between individual hAMCs. Further studies for developing novel methods to select sub-populations of hAMSCs are warranted for their clinical applications, in which CD105 and stem cell gene Nanog-3 are possible candidate markers.

Approximation-Based Adaptive Tracking Control of Pure-Feedback Nonlinear Systems With Multiple Unknown Time-Varying Delays

Min Wang,Shuzhi Sam Ge,Keum-Shik Hong IEEE 2010 IEEE transactions on neural networks Vol.21 No.11

<P>This paper presents adaptive neural tracking control for a class of non-affine pure-feedback systems with multiple unknown state time-varying delays. To overcome the design difficulty from non-affine structure of pure-feedback system, mean value theorem is exploited to deduce affine appearance of state variables as virtual controls , and of the actual control . The separation technique is introduced to decompose unknown functions of all time-varying delayed states into a series of continuous functions of each delayed state. The novel Lyapunov-Krasovskii functionals are employed to compensate for the unknown functions of current delayed state, which is effectively free from any restriction on unknown time-delay functions and overcomes the circular construction of controller caused by the neural approximation of a function of and . Novel continuous functions are introduced to overcome the design difficulty deduced from the use of one adaptive parameter. To achieve uniformly ultimate boundedness of all the signals in the closed-loop system and tracking performance, control gains are effectively modified as a dynamic form with a class of even function, which makes stability analysis be carried out at the present of multiple time-varying delays. Simulation studies are provided to demonstrate the effectiveness of the proposed scheme.</P>

從“末路文人”到“無冕之王”: 近代中國報人職業化연硏究

( Min Wang ) 국민대학교 중국지식네트워크 2011 중국지식네트워크 Vol.1 No.-

近代中國報人職業化大致經歷了三個時代,分別是尊聞閣時代、息樓時代和大公報人時代。尊聞閣報人時代是報人的誕生期,息樓報人時代是轉型期,大公報人時代是報人的成熟期。報人職業化始於19世紀五六十年代的香港、上海等口岸城市,報人來源主要是中國傳統讀書人。報人職業化主要表現在專業化和專門化兩個方面。報人職業化的依托是報業,根本推動力量則是近代以來中國社會經濟結構的變遷。作爲傳統時代受過良好敎育的知識人,在社會轉型時期,讀書人擁有更多的選擇空間。當報人只是部分讀書人的選擇。報人是以報紙的主筆、編輯、記者等爲主體的報業從業者, 伴隨著現代報紙的出現産生。報人最早出現在17世紀德國和英國, 這些國家是現代報紙誕生的地方。 中國近代報人出現在19世紀五六十年代。在當時的香港、上海等通商口岸城市, 外商投資辦中文報紙, 開始有華人參與報紙的編輯等工作, 中國近代報人(後文稱近代報人)就此誕生。本文硏究的近代報人就是指以商業報紙的主筆、編輯、記者爲主體的職業群體。 Modern Chinese journalism professionalism experienced three times. They are Zun Wen Ge era, Xi Lou era and Takungpao era. The naissance of journalists are Zun Wen Ge. The transition period is Xi Lou Bao and the mature time is Takungpao. Professional journalist began in port cities like Hong Kong and Shanghai in the fifties and sixties of the 19th century. Most of journalists came from traditional Chinese scholars. Professionalism of journalists mainly manifested in two aspects. One is professionalism and another one is specialization. The professionalism relied on the newsletter’s development, but the fundamental driving force for the professionalism of journalists is economic structural changes in Chinese society. In a transition period, scholars have more choice and being journalists is one of their choices.

Source and Negative Effects of Macro-Inclusions in Titanium Stabilized Ultra Low Carbon Interstitial Free (Ti-IF) Steel

Min Wang,Yan-Ping Bao 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1

The source and negative effects of macro-inclusions in Ti-IF steel were studied by sliming extraction, ultrasonic detection, depth corrosion and SEM/EDS. High SiO2 content inclusions, and Al2O3 and MgO· CaO inclusions were observed after sliming. Ultrasonic results showed that defects in the surfboard with sizes 0.5 mm-3mm were mainly distributed in the inner arc and outer arc sides close to 1/8 of the slab’s surface. The number of defects in the inner arc side was 1.5 to 2 times of that in the outer arc side. Defects in the surfboard and cold-rolled plant were formed due to inclusions which were similar to that observed in the sliming sample.

Transcriptome analysis in different chieh‑qua cultivars provides new insights into drought‑stress response

Min Wang,Xiaoming He,Biao Jiang,Wenrui Liu,Yu’e Lin,Dasen Xie,Zhaojun Liang,Lihui Chen,Qingwu Peng 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.6

Drought, one of the crucial environmental constraints, seriously threats the quality and yield in chieh-qua. Therefore, cultivat-ing drought-tolerant variety is greatly necessary for its normal growth under water deficiency. However, at present, molecular knowledge on drought resistance is mostly unclear in chieh-qua. In the study, characteristics of two diverse genetic chieh-qua variety, A39 (drought-resistance) and H5 (drought-sensitivity), were analyzed. Under drought stress, H5 exerted high water loss rate, increased malonaldehyde (MDA) content, and decreased enzyme activity of glutathione peroxidase (GSH-PX) and superoxide dismutase (SOD) compared with A39. In addition, based on the transcriptome results, we obtained a total of 1821 (511 up-regulated and 1310 down-regulated) and 2114 (1282 up-regulated and 832 down- regulated) differentially expressed genes (DEGs) in the A39 versus H5 under normal and water-deficiency stress, respectively. Several DEGs involved in the cuticle synthesis (cytochrome P450 genes: CYP94A2, CYP86B1, CYP86A7), carbohydrate metabolism, and plant hormone signal transduction (small auxin-up RNA genes: SAUR32, SAUR72; JA-induced genes: TIFY 10A, TIFY 10C; ABA related genes: PYL2, PYL4) were explored and related to drought resistance. These expression patterns observed in the RNA-seq data were further confirmed with quantitative real-time PCR (qRT-PCR). In all, these results not only provided a new insight into analyzing genes of drought response, but also laid a foundation for isolating crucial genes involved in drought stress in chieh-qua.