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Search Results: 1 - 10 of 135224 matches for " Meng-Yen Li "
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Adaptive Security Modules in Incrementally Deployed Sensor Networks
Meng-Yen Hsieh,Yueh-Min Huang
International Journal on Smart Sensing and Intelligent Systems , 2008,
Abstract: Distributed wireless sensor networks often suffer problems on detecting malicious nodes, which always bring destructive threats. Thus, sensor networks have to supply authentication services for sensor identity and data communication. As matter of fact, intrusion detection and prevention schemes are always integrated in sensor security appliances so that they can enhance network security by discovering malicious or compromised nodes. This paper provides adaptive security modules to improve secure communication in distributed sensor networks. The primary security module provides online identity authentication services to new incoming sensor nodes which being distributed after initial deployment. The advanced security module addresses compromised node detection issues to exclude internal compromised nodes. The proposed schemes can accomplish secure communications in the sensor networks when the network lifetime is divided into multiple time intervals. The network security and network performance are evaluated with the adaptive security modules, which shows efficient protection and sensible overheads to sensor nodes can be achieved.
Dramatic Co-Activation of WWOX/WOX1 with CREB and NF-κB in Delayed Loss of Small Dorsal Root Ganglion Neurons upon Sciatic Nerve Transection in Rats
Meng-Yen Li,Feng-Jie Lai,Li-Jin Hsu,Chen-Peng Lo,Ching-Li Cheng,Sing-Ru Lin,Ming-Hui Lee,Jean-Yun Chang,Dudekula Subhan,Ming-Shu Tsai,Chun-I Sze,Subbiah Pugazhenthi,Nan-Shan Chang,Shur-Tzu Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007820
Abstract: Tumor suppressor WOX1 (also named WWOX or FOR) is known to participate in neuronal apoptosis in vivo. Here, we investigated the functional role of WOX1 and transcription factors in the delayed loss of axotomized neurons in dorsal root ganglia (DRG) in rats.
Nonlinear Raman Shift Induced by Exciton-to-Trion Transformation in Suspended Trilayer MoS2
Hossein Taghinejad,Mohammad Taghinejad,Alexey Tarasov,Meng-Yen Tsai,Amir H. Hosseinnia,Philip M. Campbell,Ali A. Eftekhar,Eric M. Vogel,Ali Adibi
Physics , 2015,
Abstract: Layered two-dimensional (2D) semiconductors such as molybdenum disulfide (MoS2) have recently attracted remarkable attention because of their unique physical properties. Here, we use photoluminescence (PL) and Raman spectroscopy to study the formation of the so- called trions in a synthesized freestanding trilayer MoS2. A trion is a charged quasi-particle formed by adding one electron or hole to a neutral exciton (a bound electron-hole pair). We demonstrate accurate control over the transformation of excitons to trions by tuning the power of the optical pump (laser). Increasing the power of the excitation laser beyond a certain threshold (~ 4 mW) allows modulation of trion-to-exciton PL intensity ratio as well as the spectral linewidth of both trions and excitons. Via a systematic and complementary Raman analysis we disclose a strong coupling between laser induced exciton-to-trion transformation and the characteristic phononic vibrations of MoS2. The onset of such an optical transformation corresponds to the onset of a previously unknown nonlinear Raman shift of the in-plane (E12g) and out-of-plane (A1g) vibrational modes. This coupling directly affects the well-known linear red-shift of the A1g and E12g vibrations due to heating at low laser powers, and changes it to a nonlinear and non-monotonic dependence with a blue-shift in the high laser power regime. Local reduction of the electron density upon exciton-to-trion transformation is found to be the underlying mechanism for the blue-shift at high laser powers. Our findings enrich our knowledge about the strong coupling of photonic and phononic properties in 2D semiconductors, and enable reliable interpretation of PL and Raman spectra in the high laser power regimes.
Involvement of the Cav3.2 T-type calcium channel in thalamic neuron discharge patterns
Yi-Fang Liao, Meng-Li Tsai, Chien-Chang Chen, Chen-Tung Yen
Molecular Pain , 2011, DOI: 10.1186/1744-8069-7-43
Abstract: Under pentobarbital or urethane anesthesia, the patterns of tonic and burst firings were recorded in functionally characterized RT and VPL neurons of Cav3.2 KO mice. Many RT neurons were nociceptive (64% under pentobarbital anesthesia and 50% under urethane anesthesia). Compared to their wild-type (WT) controls, fewer nociceptive RT neurons were found in Cav3.2 KO mice. Both nociceptive and tactile RT neurons showed fewer bursts in Cav3.2 KO mice. Within a burst, RT neurons of Cav3.2 KO mice had a lower spike frequency and less-prominent accelerando-decelerando change. In contrast, VP neurons of Cav3.2 KO mice showed a higher ratio of bursts and a higher discharge rate within a burst than those of the WT control. In addition, the long-lasting tonic firing episodes in RT neurons of the Cav3.2 KO had less stereotypic regularity than their counterparts in WT mice.RT might be important in nociception of the mouse. In addition, we showed an important role of Cav3.2 subtype of T-channel in RT burst firing pattern. The decreased occurrence and slowing of the bursts in RT neurons might cause the increased VP bursts. These changes would be factors contributing to alternation of pain behavior in the Cav3.2 KO mice.Thalamic burst and tonic firing patterns are important in many behavioral states [1-3]. In relate to sensory functions, firing patterns are highly correlated to the responsiveness to sensory stimulation [4-6]. Thus, thalamic burst firing is thought to gate sensory inputs. Thalamic burst firing occurred in human subjects after noxious stimulation [7-9] and was also found spontaneously in human neurogenic pain patients [10,11]. Furthermore, suppression of thalamic bursts genetically or pharmacologically changes nociceptive responses. For example, thalamic burst firing was absent in Cav3.1 subtype T-channel knockout (KO) mice, and these mice showed increased visceral nocicepetive writhing behavior [12]. Mice intrathalamically treated with mibefradil (a T-channel blocke
Bis{1-[(E)-(2-methylphenyl)diazenyl]-2-naphtholato}palladium(II)
Meng-Ling Lin,Chen-Yen Tsai,Chen-Yu Li,Bor-Hunn Huang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810028916
Abstract: In the title compound, [Pd(C17H13N2O)2], the PdII atom is tetracoordinated by two N atoms and two O atoms from two bidentate methylphenyldiazenylnaphtolate ligands, forming a square-planar complex. The two N atoms and two O atoms around the PdII atom are trans to each other (as the PdII atom lies on a crystallographic inversion centre) with O—Pd—N bond angles of 89.60 (11) and 90.40 (11)°. The distances between the PdII atom and the coordinated O and N atoms are 1.966 (3) and 2.009 (3) , respectively.
Comparing radiation exposure during percutaneous vertebroplasty using one- vs. two-fluoroscopic technique
Li Yen-Yao,Huang Tsung-Jen,Cheng Chin-Chang,Wu Meng-Huang
BMC Musculoskeletal Disorders , 2013, DOI: 10.1186/1471-2474-14-38
Abstract: Background Percutaneous vertebroplasty (PV) requires relatively lengthy fluoroscopic guidance, which might lead to substantial radiation exposure to patients or operators. The two-fluoroscopic technique (two-plane radiographs obtained using two fluoroscopes) during PV can provide simultaneous two-planar projections with reducing operative time. However, the two-fluoroscopic technique may expose the operator or patient to increased radiation dose. The aim of this study was to quantify the amount of radiation exposure to the patient or operator that occurs during PV using one- vs. two-fluoroscopic technique. Methods Two radiation dosimeters were placed on the right flank of each patient and on the upper sternum of each operator during 26 single-level PV procedures by one senior surgeon. The use of two-fluoroscopic technique (13 patients) and one-fluoroscopic technique (13 patients) were allocated in a consecutive and alternative manner. The operative time and mean radiation dose to each patient and operator were monitored and compared between groups. Results Mean radiation dose to the patient was 1.97 ± 1.20 mSv (95% CI, 0.71 to 3.23) for the one-fluoroscopic technique group vs. 0.95 ± 0.34 mSv (95% CI, 0.85 to 1.23) for the two-fluoroscopic technique group (P =0.031). Mean radiation dose to the operator was 0.27 ± 0.12 mSv (95% CI, 0.17–0.56) for the one-fluoroscopic technique group vs. 0.25 ± 0.14 mSv (95% CI, 0.06–0.44) for the two-fluoroscopic technique group (P = 0.653). The operative time was significantly different between groups: 47.15 ± 13.48 min (range, 20–75) for the one-fluoroscopic technique group vs. 36.62 ± 8.42 min (range, 21–50) for the two-fluoroscopic technique group (P =0.019). Conclusion Compared to the one-fluoroscopic technique, the two-fluoroscopic technique used during PV provides not only shorter operative times but also reduces the radiation exposure to the patient. There was no significant difference between the two techniques with regards to radiation exposure to the operator.
Infectious Spondylitis-Associated Staphylococcus aureus with Virulence Gene pvl or tst Causes More Necrosis than Apoptosis in Human Alveolar Basal Epithelial Cell Line A549  [PDF]
Tsung-Jen Huang, Chi-Han Lee, Meng-Huang Wu, Yen-Yao Li, Tsung Han Yang, Chin-Chang Cheng, Ching-Yu Lee, Chih-Cheng Lu, Chishih Chu
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.67047
Abstract: Methicillin-sensitive and resistant Staphylococcus aureus (MSSA and MRSA, respectively) can cause non-tuberculosis infectious spondylitis. In 43 cases of bacterial infectious spondylitis, Mycobacterium tuberculosis and S. aureus were the two major causative pathogens. MRSA caused more anterior operations and thoracic infections, while MSSA caused more posterior infections and lumbar infections. Differences between six S. aureus isolates from infectious spondylitis were characterized. MLST and staphylococcal cassette chromosome mec (SCCmec) analysis identified MSSA ST959 and ST30 isolates, MRSA ST239/SCCmec IIIA isolates 2 and 3, ST59/SCCmec IIIA-like isolate 6, and ST30/SCCmec IV isolate 5. While all of the isolates were resistant to penicillin and ampicillin, the MRSA isolates were more resistant than the MSSA isolates. Carbapenem-resistant MRSA ST239/SCCmec IIIA and ST59/SCCmec IIIA-like isolates of the agr1 type were also resistant to clindamycin and erythromycin. Leukocidin genes (pvl or lukED) and hemolysin genes (
The Progress of Biomechanical Researches in Kayaking  [PDF]
Meng Li
Yangtze Medicine (YM) , 2016,
Abstract: In this review, we summarized literatures about biomechanical researches in kayaking. Biomechanic researches provide a number of valuable data of analytical techniques and kayak moving posture for coaches and athletes. 3-D kinematic analysis, on-water dynamic analysis and surface electromyography measurement are the most common methods through which we can describe and assess effects of paddling tech-niques and training. The purposes of numerous current studies are to identify the factors which restrict kayak performance, make improvement of techniques, prevent and correct mistakes, and develop new type of practical instrument. As a result, we found that although researchers realized the importance of kayaking balance ability and core stability, but balance ability and core stability haven’t been considered yet in mechanics analysis and instrument design fields, nor have the research of muscle working status under unsteady state. Based on our novel findings through this literature review, we proposed important directions for further study in biomechanical researches in kayaking.
Role of the supine lateral radiograph of the spine in vertebroplasty for osteoporotic vertebral compression fracture: a prospective study
Meng-Huang Wu, Tsung-Jen Huang, Chin-Chang Cheng, Yen-Yao Li, Robert Hsu
BMC Musculoskeletal Disorders , 2010, DOI: 10.1186/1471-2474-11-164
Abstract: We enrolled 37 patients with 40 symptomatic osteoporotic VCFs for vertebroplasty; 11 had severely collapsed VCFs with concurrent IVCs detected on the SuLR, the others had not-severely collapsed VCFs. A preoperative StLR, SuLR, magnetic resonance imaging (MRI), and postoperative StLR were taken from all patients. Radiographs were digitized to calculate vertebral body morphometrics including vertebral height ratio and Cobb's kyphotic angle. The intensity of the patient's pain was assessed by the visual analogue scale (VAS) on the day before operation and 1 day, 1 month, and 4 months after operation. The patient's VAS scores and image measurement results were assessed with the paired t-test and Pearson correlation tests; Mann-Whitney U test was used for VAS subgroup comparison. Significance was defined as p < 0.05.IVCs in patients with not-severely collapsed VCFs were detected in 21 vertebrae (72.4%) by MRI, in 15 vertebrae (51.7%) by preoperative SuLR, and in 7 vertebrae (24.1%) by preoperative StLR. Using the MRI as a gold standard to detect IVCs, SuLR exhibit a sensitivity of 0.71 as compared to StLR that yield a sensitivity of 0.33. In patients with VCFs with IVCs detected on SuLR, the average of the postoperative restoration in vertebral height ratio was significantly higher than that in those without IVCs (17.1% vs. 6.4%). There was no statistical difference in the VAS score between severely collapsed VCFs with IVCs detected on SuLR and not-severely collapsed VCFs at any follow-up time point.The SuLR efficiently detects an IVC in VCF, which indicates a better vertebral height correction after vertebroplasty compared to VCF without IVC. Before performing a costly MRI, SuLR can identify more IVCs than StLR in patients with severely collapsed VCFs, whom may become the candidates for vertebroplasty.Vertebroplasty is a minimally invasive surgical procedure that can relieve pain caused by an osteoporotic vertebral compression fracture (VCF) [1-4]. However, VCFs that sh
Dynamic neural networks for real-time water level predictions of sewerage systems-covering gauged and ungauged sites
Yen-Ming Chiang, Li-Chiu Chang, Meng-Jung Tsai, Yi-Fung Wang,Fi-John Chang
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2010,
Abstract: In this research, we propose recurrent neural networks (RNNs) to build a relationship between rainfalls and water level patterns of an urban sewerage system based on historical torrential rain/storm events. The RNN allows signals to propagate in both forward and backward directions, which offers the network dynamic memories. Besides, the information at the current time-step with a feedback operation can yield a time-delay unit that provides internal input information at the next time-step to effectively deal with time-varying systems. The RNN is implemented at both gauged and ungauged sites for 5-, 10-, 15-, and 20-min-ahead water level predictions. The results show that the RNN is capable of learning the nonlinear sewerage system and producing satisfactory predictions at the gauged sites. Concerning the ungauged sites, there are no historical data of water level to support prediction. In order to overcome such problem, a set of synthetic data, generated from a storm water management model (SWMM) under cautious verification process of applicability based on the data from nearby gauging stations, are introduced as the learning target to the training procedure of the RNN and moreover evaluating the performance of the RNN at the ungauged sites. The results demonstrate that the potential role of the SWMM coupled with nearby rainfall and water level information can be of great use in enhancing the capability of the RNN at the ungauged sites. Hence we can conclude that the RNN is an effective and suitable model for successfully predicting the water levels at both gauged and ungauged sites in urban sewerage systems.
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