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Search Results: 1 - 10 of 32560 matches for " Na Hu "
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A PTS Optimization Scheme with Superimposed Training for PAPR Reduction in OFDM System  [PDF]
Renze Luo, Rui Li, Xiaoqiong Wu, Shuainan Hu, Na Niu
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.62012
Abstract:

Partial Transmit Sequences (PTS) is an efficient scheme for Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) system. It does not bring any signal distortion. However, its remarkable drawback is the high computational complexity. In order to reduce the computational complexity, currently many PTS methods have been proposed but with the cost of the loss of PAPR performance of the system. In this paper, we introduce an improved PTS optimization method with superimposed training. Simulation results show that, compared with conventional PTS, improved PTS scheme can achieve better PAPR performance while be implemented with lower computation complexity of the system.

Evaluation of Magnetic Resonance Imaging Findings and Short-Term Outcome in Brain Metastatic Tumors after CyberKnife Treatment  [PDF]
Jiashou Hu, Hongzi Tian, Na Guo, Di Wang, Jinfeng Sun
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2016, DOI: 10.4236/ijmpcero.2016.51010
Abstract: Objective: To evaluate the treatments’ outcomes in brain metastatic tumors after CyberKnife treatment according to magnetic resonance imaging (MRI) findings and improvement of symptoms. Methods: A retrospective analysis of CyberKnife treatment; 63 cases of patients with brain metastases; the use of CyberKnife treatment; short-term outcome evaluation after treatment and the MRI findings and measured before treatment and underwent diffusion-weighted imaging MRI scan of apparent diffusion coefficient (ADC) values. Results: 3 months after CyberKnife treatment and effectiveness were 82.5% and 96.8% respectively; 6 months and one year survival rates were 82.5% and 55.6% respectively; the median survival time was 16 months. MRI of 52 patients (67 lesions) ADC values after treatment increased to some extent than before treatment. There are 38 lesions volume to shrink or disappear, no enhancement or slight enhancement in the lesion, no edema zone; 27 lesions does not change in volume, no edema (18 lesions significantly weakened the degree of enhancement; 6 lesions showed no obvious change enhancement; 3 lesions showed ring enhancement, internal cystic); 2 lesions volume were larger, heterogeneous enhancement, peripheral edema. Conclusion: CyberKnife is an effective method for treating brain metastatic tumor. MRI can accurately evaluate tumor lesions after treatment.
A clinicopathological study of Dermatofibrosarcoma Protuberans in Maiduguri, Northeastern Nigeria
HA Nggada, BM Gali, HU Na’aya
Nigerian Journal of Surgical Research , 2006,
Abstract: Background Dermatofibrosarcoma protuberans (dfsp) is a rare tumour originating from the dermis, it is slow growing, nodular, polypoid neoplasm that invade the subcutaneous tissue and does not usually metastasis.Clinical presentation is not uniform and may mimic common tropical benign skin lesions.We intend to study the behaviour of this tumour in our environment . Materails and method. A Clinicopathologic study of 36 cases of histologically diagnosed Dermatofibrosarcoma protuberans in University Maiduguri Teaching Hospital was carried out.DFSP constitutes 3.05% of all cases of all cancers and 10.2 % of all skin cancers. The peak age incidence was the 4th and 6th decades with a median age 37.6 years. The males to female ratio was 2:1. The commonest site was the trunk 17(48.8%), followed by the lower limbs 8 (22.9%); upper limbs 6(17.1%); head and neck 3(8.6%) and buttock 1(2.9%) were not frequently affected.. Conclsusion: DFSP is a common lesion in our environment that warrants proper clinical assessment, and histological characterisation.
Topological properties of the FQH quasiparticles from the entanglement entropy
Na Jiang,Zi-Xiang Hu
Physics , 2015,
Abstract: The topological entanglement entropy is a robust measurement of the quantum many-body state with topological order. In fractional quantum Hall (FQH) state, it has a connection to the quantum dimension of the state itself and its quasihole excitations from the conformal field theory (CFT) description. We systematically study the entanglement entropy in the Laughlin, Moore-Read, and Read-Rezayi FQH states. The Abelian nature of the quasihole manifests in the invariant of the entanglement entropy and spectrum while it is created in the subsystem. Whereas the non-Abelian quasihole excitation induces an extra correction of the topological entanglement entropy and the changing of the structure of the entanglement spectrum. The quantum dimension of the quasihole can be obtained from the entropy difference before and after inserting the quasihole. On the other hand, the entanglement entropy behaviors similarly to the density profile and has less oscillations far away from the center of quasihole. It gives us a better definition of the quasihole boundary and the measurement of the size of the quasihole.
Abelian regular coverings of the quaternion hypermap
Na-Er Wang,Kan Hu
Mathematics , 2015,
Abstract: A hypermap is an embedding of a connected hypergraph into an orientable closed surface. A covering between hypermaps is a homomorphism between the embedded hypergraphs which extends to an orientation-preserving covering of the supporting surfaces. A covering of a hypermap onto itself is an automorphism, and a hypermap is regular if its automorphism group acts transitively on the brins. Depending on the algebraic theory of regular hypermaps and hypermap operations, the abelian regular coverings over the quaternion hypermap are investigated. We define normalized multicyclic coverings between regular hypermaps, generalizing almost totally branched coverings studied in [K. Hu, R. Nedela, N.-E Wang, Branched cyclic regular coverings over platonic maps, European J. Combin. 36 (2014) 531--549]. It is shown that the covering transformation group of a normalized multicyclic covering is a nilpotent group with bounded class. As an application the abelian normalized bicyclic coverings over the quaternion hypemap are classified. In particular, those coverings which possess various level of external symmetry or fulfil certain smoothness conditions are explicitly determined.
Noninvasive Blood Glucose Monitoring System Based on Distributed Multi-Sensors Information Fusion of Multi-Wavelength NIR  [PDF]
Bo Zeng, Wei Wang, Na Wang, Funing Li, Fulong Zhai, Lintao Hu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B114
Abstract:

In this research, a near infrared multi-wavelength noninvasive blood glucose monitoring system with distributed laser multi-sensors is applied to monitor human blood glucose concentration. In order to improve the monitoring accuracy, a multi-sensors information fusion model based on Back Propagation Artificial Neural Network is proposed. The Root- Mean-Square Error of Prediction for noninvasive blood glucose measurement is 0.088mmol/L, and the correlation coefficient is 0.94. The noninvasive blood glucose monitoring system based on distributed multi-sensors information fusion of multi-wavelength NIR is proved to be of great efficient. And the new proposed idea of measurement based on distri- buted multi-sensors, shows better prediction accuracy.

Normobaric hypoxia-induced brain damage in wistar rat  [PDF]
Ding-Yu Hu, Qin Li, Bo Li, Rong-Ji Dai, Li-Na Geng, Yu-Lin Deng
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.28092
Abstract: The biochemical indicators of wistar rat under low oxygen concentration, such as brain water content, necrosis, lactic acid and Na+-K+-ATPase, was detected to evaluate normobaric hypoxia-induced brain damage and to investigate the mechanism of wistar rat brain injury. Histopathological changes in brain tissue induced by hypoxia were investigated via hematoxylin and eosin stain (HE). Hypoxia induced factor-1α (HIF-1α) expression in brain was confirmed using immunohistochemistry. The results showed that the level of lactic acid was positively correlated with the degree of hypoxia, while concentration-dependent decrease in total Na+-K+-ATPase activity was observed. Compared with the control group, hypoxia group had a significant difference on brain water content under severe hypoxic conditions, the rate of brain necrosis increased obviously, followed by the increase of lactic acid level and the decrease of Na+-K+-ATPase activity. Histopathological analysis of brain confirmed that there was neuronal cell death in hippocampal gyrus. HIF-1α expression enhanced the hypoxia adaptation capability of the rat model through regulating the expressions of multiple genes. Lactic acid, Na+-K+-ATPase and HIF- 1α played an important role in brain injury as a possible mechanism.
The Effect of Renal Sympathetic Denervation (RSD) in Atrial Fibrillation (AF) Inducibility  [PDF]
Indra Prasad Upadhyay, Jialu Hu, Wugeti Naji Na, Wang Kun, Taji Di Linuer, Zhao Li, Alia  , Yuemei Hou
World Journal of Cardiovascular Diseases (WJCD) , 2014, DOI: 10.4236/wjcd.2014.44020
Abstract: Objective: The purpose of this study is to investigate the effects of renal sympathetic nerve stimulation (RSN-S) and ablation (RSN-A) on atrial effective refractory period (ERP) and AF in normal canine heart. Atrial Fibrillation (AF) is a complex disease and one of the most frequent arrhythmias, especially in elderly patients. Multiple mechanisms are involved including interaction between the autonomic nervous system (ANS), electrophysiological properties of the atria, and vulnerability for AF. Cardiac overload increases the incidence of AF. In lone AF the triggers are in the pulmonary veins. AF caused by underlying disease has different mechanism. Atrial fibrillation (AF) is associated with activity of renin-angiotensin-aldosterone system (RAAS). Reduction in renal nor-adrenaline spillover could be achieved after renal sympathetic denervation (RSD). Methods: 1) Establish of atrial fibrillation model; 2) Ventricular rate analysis of AF; 3) Statistical analysis. Results: 1) The establishment of atrial fibrillation model; 2) Inducibility and duration of AF; 3) The changes of AERP dispersion. Conclusion: Left RSN-S shortened left atrial ERP, increased ERP dispersion, but did not change right atrial ERP. Bilateral RSN-A produced significant prolongation in both atrial ERP, but did not affect ERP dispersion. The on time of RD effect is at 4 hrs after RD procedure and the RD effect on AF will last for 20 hrs after RD procedure.
Parasitic twins - A case report from the University of Maiduguri Teaching Hospital
HU Na’aya, AM Lawan, AI Gadams
Nigerian Journal of Paediatrics , 2005,
Abstract:
New Historical Materials of Poets'' Deeds in the Tang Dynasty
唐代诗人事迹新证

Hu Kexian,Wei Na,
胡可先
,魏娜

浙江大学学报(人文社会科学版) , 2010,
Abstract: Recently unearthed documents have opened new opportunities for research into the poetry of the Tang Dynasty . The newly discovered documents offer the potential for extensive research into the poets during this dynasty , such as Cui Hao's appointed official position , Han Yu's friends , and the position of Miao Fa within his family . Wrong information from the poets'biographies ,as described in the official history books , can be corrected with this new information . With the discovery of these documents ,research into the poetry of the Tang Dynasty can be expanded .
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