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Search Results: 1 - 10 of 99006 matches for " Chen Jyh-Ming "
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Improving SCTP Performance by Jitter-Based Congestion Control over Wired-Wireless Networks
Chen Jyh-Ming,Chu Ching-Hsiang,Wu EricHsiao-Kuang,Tsai Meng-Feng
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: With the advances of wireless communication technologies, wireless networks gradually become the most adopted communication networks in the new generation Internet. Computing devices and mobile devices may be equipped with multiple wired and/or wireless network interfaces. Stream Control Transmission Protocol (SCTP) has been proposed for reliable data transport and its multihoming feature makes use of network interfaces effectively to improve performance and reliability. However, like TCP, SCTP suffers unnecessary performance degradation over wired-wireless heterogeneous networks. The main reason is that the original congestion control scheme of SCTP cannot differentiate loss events so that SCTP reduces the congestion window inappropriately. In order to solve this problem and improve performance, we propose a jitter-based congestion control scheme with end-to-end semantics over wired-wireless networks. Besides, we solved ineffective jitter ratio problem which may cause original jitter-based congestion control scheme to misjudge congestion loss as wireless loss. Available bandwidth estimation scheme will be integrated into our congestion control mechanism to make the bottleneck more stabilized. Simulation experiments reveal that our scheme (JSCTP) gives prominence to improve performance effectively over wired-wireless networks.
Improving SCTP Performance by Jitter-Based Congestion Control over Wired-Wireless Networks
Jyh-Ming Chen,Ching-Hsiang Chu,Eric Hsiao-Kuang Wu,Meng-Feng Tsai
EURASIP Journal on Wireless Communications and Networking , 2011, DOI: 10.1155/2011/103027
Primary pleural angiosarcoma as a mimicker of mesothelioma: a case report
Yu-Chien Kao, Jyh-Ming Chow, Kum-Min Wang, Chia-Lang Fang, Jan-Show Chu, Chi-Long Chen
Diagnostic Pathology , 2011, DOI: 10.1186/1746-1596-6-130
Abstract: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1059343251633446 webciteAngiosarcoma is an uncommon malignant tumor of endothelial differentiation. It accounts for about 1% of all soft tissue malignancies and most commonly arises in skin, soft tissue, breast, liver, bone and spleen [1].Primary pleural angiosarcoma (PPA) is a rare occurrence. Since its first description in 1943,[2] only 39 reported cases of PPA have been published [1-22]. Patients almost always die of the disease within months. Definite diagnosis is usually not possible using the examination of cytology or small biopsy specimens, but often requires that of decortication or resection specimens. The histologic picture of biphasic spindle and epithelioid tumor cells along with immunoreactivity to epithelial markers, such as cytokeratin and CK7, may lead to an erroneous diagnosis of mesothelioma or metastatic sarcomatoid carcinoma. Identifying areas showing vasoformative tendency and immunostains with endothelial markers, such as CD31, CD34, factor VIII and FLI-1, are diagnostically important.We describe herein a case of PPA, to highlight its aggressive clinical behavior and the diagnostic pitfalls.A 49 year-old-male patient presented with intermittent right chest pain for one month. The pain progressed with exertional dyspnea. He had a 10-year history of asthma under regular medical treatment and was an ex-smoker (half package-per-day for 20 years in the past) who quit 10 years ago. He did not have any history of asbestos exposure or tuberculous infection. In physical examination, breathing sounds were decreased at the right lung. Chest radiography and computed tomography revealed right-side loculated pleural effusion with pleural thickening but without mass lesion (Figure 1). Fine needle aspiration showed some bloody and sticky pleural effusion. The value of hematocrit of the effusion was 39.5% (peripheral blood hematocrit: 38.9%). Cytologic examin
Distinct functional defect of three novel Brugada syndrome related cardiac sodium channel mutations
Chia-Hsiang Hsueh, Wen-Pin Chen, Jiunn-Lee Lin, Chia-Ti Tsai, Yen-Bin Liu, Jyh-Ming Juang, Hsuan-Ming Tsao, Ming-Jai Su, Ling-Ping Lai
Journal of Biomedical Science , 2009, DOI: 10.1186/1423-0127-16-23
Abstract: SCN5A encodes the alpha subunit of human cardiac sodium channel, which is responsible for the generation of cardiac action potential and for rapid impulse conduction through the myocardium[1]. Mutations in SCN5A cause inherited arrthymia syndrome such as Long QT syndrome (LQT3), Brugada syndrome, isolated conduction disease, atrial stanstill, congenital sick sinus syndrome or sudden infant death syndrome [2,3]. Chen et al. first reported in 1998 that loss of function mutations of SCN5A accounts for the most well-known genetic basis for Brugada syndrom[4]. However, for the clinically diagnosed cases, only no more than 20% carry SCN5A mutations[5]. Mutations in other genes that cause Brugada syndrome have been reported. These genes include glycerol-3-phosphate dehydrogenase 1-like gene (GPD1L), the alpha subunit of the L-type calcium channel (CACNA1C), the beta subunit of the L-type calcium channel (CACNB2b), and the sodium channel beta subunit (SCN1B) [6-8]. However, SCN5A is so far still the most often reported gene causing Brugada syndrome. Altered electrophysiology, trafficking, expression level, or interaction with its intracellular components all has been reported to account for the mechanisms contribute to loss of function of SCN5A [9-12]. In this study, we investigated on three SCN5A mutation identified in patients with Brugada syndrome in Taiwan and tried to identify the underlying mechanism of three mutations that contribute to Brugada syndrome.Total RNA was extracted from human heart tissue using trizol (Invitrogen, USA) according to manufacturer's protocol. Complimentary DNA was synthesized using 200 units of Superscript III reverse transcriptase (Invitrogen, USA) at 52°C for 50 min in the presence of 5 μg of total RNA, 0.5 μg of oligo-dT primers, 0.004 mM DTT, 5% DMSO and 0.2 mM dNTPs, and the reaction product was used as the template in subsequent polymerase chain reaction(PCR). The PCR product for SCN1B was first cloned into pAAV-IRES-hrGFP (Stratagene,
Decomposing Digital Paintings into Layers via RGB-space Geometry
Jianchao Tan,Jyh-Ming Lien,Yotam Gingold
Computer Science , 2015,
Abstract: In digital painting software, layers organize paintings. However, layers are not explicitly represented, transmitted, or published with the final digital painting. We propose a technique to decompose a digital painting into layers. In our decomposition, each layer represents a coat of paint of a single paint color applied with varying opacity throughout the image. Our decomposition is based on the painting's RGB-space geometry. In RGB-space, a geometric structure is revealed due to the linear nature of the standard Porter-Duff "over" pixel compositing operation. The vertices of the convex hull of pixels in RGB-space suggest paint colors. Users choose the degree of simplification to perform on the convex hull, as well as a layer order for the colors. We solve a constrained optimization problem to find maximally translucent, spatially coherent opacity for each layer, such that the composition of the layers reproduces the original image. We demonstrate the utility of the resulting decompositions for re-editing.
Lower Temperature Cultures Enlarge the Effects of Vitreoscilla Hemoglobin Expression on Recombinant Pichia pastoris
Jyh-Ming Wu,Shin-Yao Wang,Wei-Chang Fu
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131013212
Abstract: An heterologous expression of Vitreoscilla hemoglobin (VHb) for improving cell growth and recombinant protein production has been successfully demonstrated in various hosts, including Pichia pastoris. Lower temperature cultures can enhance target protein production in some studies of P. pastoris. In this study, the strategy of combining heterologous VHb expression and lower temperature cultures in P. pastoris showed that final cell density and viability of VHb + strain at 23 °C were higher than that at 30 °C. In addition, the effects of VHb expression on recombinant β-galactosidase production and oxygen uptake rate were also higher at 23 °C than at 30 °C. Consequently, lower temperature cultures can enlarge VHb effectiveness on cell performance of P. pastoris. This is because VHb activity obtained at 23 °C cultures was twofold higher than that at 30 °C cultures, due to a different heme production. This strategy makes P. pastoris an excellent expression host particularly suitable for increasing the yields of the low-stability and aggregation-prone recombinant proteins.
Room temperature-synthesized vertically aligned InSb nanowires: electrical transport and field emission characteristics
Cheng-Hsiang Kuo, Jyh-Ming Wu and Su-Jien Lin
Nanoscale Research Letters , 2013, DOI: 10.1186/1556-276X-8-69
Abstract: Vertically aligned single-crystal InSb nanowires were synthesized via the electrochemical method at room temperature. The characteristics of Fourier transform infrared spectrum revealed that in the syntheses of InSb nanowires, energy bandgap shifts towards the short wavelength with the occurrence of an electron accumulation layer. The current–voltage curve, based on the metal–semiconductor–metal model, showed a high electron carrier concentration of 2.0 × 1017 cm 3 and a high electron mobility of 446.42 cm2 V 1 s 1. Additionally, the high carrier concentration of the InSb semiconductor with the surface accumulation layer induced a downward band bending effect that reduces the electron tunneling barrier. Consequently, the InSb nanowires exhibit significant field emission properties with an extremely low turn-on field of 1.84 V μm 1 and an estimative threshold field of 3.36 V μm 1.
Electrospun ZnO Nanowires as Gas Sensors for Ethanol Detection
Wu Wan-Yu,Ting Jyh-Ming,Huang Po-Jung
Nanoscale Research Letters , 2009,
Abstract: ZnO nanowires were produced using an electrospinning method and used in gas sensors for the detection of ethanol at 220 °C. This electrospinning technique allows the direct placement of ZnO nanowires during their synthesis to bridge the sensor electrodes. An excellent sensitivity of nearly 90% was obtained at a low ethanol concentration of 10 ppm, and the rest obtained at higher ethanol concentrations, up to 600 ppm, all equal to or greater than 90%.
Synthesis of SnO2-ZnO Core-Shell Nanowires and Their Optoelectronic Properties
Ko-Ying Pan,Yu-Hung Lin,Po-Sheng Lee,Jyh-Ming Wu,Han C. Shih
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/279245
Abstract: Zinc oxides deposited on Tin dioxide nanowires have been successfully synthesized by atomic layer deposition (ALD). The diameter of SnO2-ZnO core-shell nanowires is 100 nm by ALD 200 cycles. The result of electricity measurements shows that the resistance of SnO2-ZnO core-shell nanowires (ALD: 200 cycles) is 925 Ω, which is much lower than pure SnO2 nanowires (3.6 × 106 Ω). The result of UV light test shows that the recovery time of SnO2-ZnO core-shell nanowires (ALD: 200 cycles) is 328 seconds, which is lower than pure SnO2 nanowires (938 seconds). These results demonstrated that the SnO2-ZnO core-shell nanowires have potential application as UV photodetectors with high photon-sensing properties.
Simultaneous Detection of Multiple Fish Pathogens Using a Naked-Eye Readable DNA Microarray
Chin-I Chang,Pei-Hsin Hung,Chia-Che Wu,Ta Chih Cheng,Jyh-Ming Tsai,King-Jung Lin,Chung-Yen Lin
Sensors , 2012, DOI: 10.3390/s120302710
Abstract: We coupled 16S rDNA PCR and DNA hybridization technology to construct a microarray for simultaneous detection and discrimination of eight fish pathogens (Aeromonas hydrophila, Edwardsiella tarda, Flavobacterium columnare, Lactococcus garvieae, Photobacterium damselae, Pseudomonas anguilliseptica, Streptococcus iniae and Vibrio anguillarum) commonly encountered in aquaculture. The array comprised short oligonucleotide probes (30 mer) complementary to the polymorphic regions of 16S rRNA genes for the target pathogens. Targets annealed to the microarray probes were reacted with streptavidin-conjugated alkaline phosphatase and nitro blue tetrazolium/5-bromo-4-chloro-3′-indolylphosphate, p-toluidine salt (NBT/BCIP), resulting in blue spots that are easily visualized by the naked eye. Testing was performed against a total of 168 bacterial strains, i.e., 26 representative collection strains, 81 isolates of target fish pathogens, and 61 ecologically or phylogenetically related strains. The results showed that each probe consistently identified its corresponding target strain with 100% specificity. The detection limit of the microarray was estimated to be in the range of 1 pg for genomic DNA and 103 CFU/mL for pure pathogen cultures. These high specificity and sensitivity results demonstrate the feasibility of using DNA microarrays in the diagnostic detection of fish pathogens.
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