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Search Results: 1 - 10 of 35607 matches for " SU Min "
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Liposarcoma of the Testis and Spermatic Cord  [PDF]
Ha Na Lee, Min Su Kim
Open Journal of Urology (OJU) , 2013, DOI: 10.4236/oju.2013.32013
Abstract:

Primary liposarcoma of the spermatic cord is rare, and preoperative diagnosis is difficult. We report a rare case of well-differentiated liposarcoma in 65-year-old man. The patient’s chief complaint was painless enlargement of a mass in the right inguinal area that had persisted for about two months. The main component of the mass was wrapped around the spermatic cord and several components were around the testis. Ultrasonography of the main component showed mixed echogenicity. CT showed an ovoid fat-containing nodule and several other fat-density masses surrounding the testis. The mass was surgically removed, along with the right testis and spermatic cord. A pathological examination showed a well-differentiated liposarcoma of the right spermatic cord and testis.

Monomial Dynamical Systems of Dimension One over Finite Fields
Min Sha,Su Hu
Mathematics , 2009,
Abstract: In this paper we study the monomial dynamical systems of dimension one over finite fields from the viewpoints of arithmetic and graph theory. We give formulas for the number of periodic points with period r and cycles with length r. Then we compute the natural distributions of periodic points and cycles. We also define and compute the Dirichlet distributions of periodic points and cycles. Especially, we associate the monomial dynamical systems with function fields to compute distributions.
Distributed Coding Modulation Adaptation Scheme for Relay Channel  [PDF]
Zi Teng, Jun Wu, Min Wang, Lifeng Su
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2008
Abstract: Rate adaptation is an effective approach to achieve high spectrum efficiency under varying channel condition, especially for wireless communication. This paper proposes rate adaptation at receiver for wireless relay system. In this scheme, source node uses a new modulation technology, called random projections code (RPC), to achieve rate adaptation. Both relay node and destination node decode the received RPC encoding signals. If destination does not decode RPC correctly, relay node will act compressing and forwarding role by performing LDPC syndrome encoding and sending syndrome coded information to destination node. We discuss how to jointly decode at destination node when it receives RPC coded information from source node and syndrome coded information from relay node. Finally, we evaluate the scheme by bit-error-rate (BER) and good put evaluation metrics. Simulation results show that the coding gain is about 4 dB, 3.1 dB, 2.2 dB and 1.6 dB for LDPC coding rate 0.8, 0.89, 0.94, 0.99 at BER 10-5 respectively. The throughput of the schemes is at least 0.3 bit/s/Hz higher than RPC at SNR ranging from 5 dB to 25 dB.
Heuristic Channel Estimation Based on Compressive Sensing in LTE Downlink Channel  [PDF]
Lin Wan, Min Wang, Lifeng Su, Jun Wu
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2018
Abstract: Pilot-assisted channel estimation has been investigated to improve the performance of OFDM based LTE systems. LS and MMSE method do not perform excellently because they do not consider the inherent sparse feature of wireless channel. The sparse feature of channel impulse response satisfies the requirement of using compressive sensing (CS) theory, which has recently gained much attention in signal processing. Result in the application of using compressive sensing to estimate fading channel. And it achieves a much better performance than that with traditional methods. In this paper, we propose heuristic channel estimation based on CS in LTE Downlink channel. According to the feature of recovery algorithm in CS, we design a modified pilot placement method. CS recovery algorithms for channel estimation don’t consider the statistics character of channel. So we proposed an optimization method which combines the CS and noise reduction. First we get initial channel statistics obtained by LS. Let the channel statistics as the heuristic information input of CS recovery algorithm. Then we perform CS recovery algorithm to estimate channel. Simulation results show this approach significantly reduces the complexity of channel estimation and get a better mean square error (MSE) performance.
A Nonparametric Derivative-Based Method for R Wave Detection in ECG  [PDF]
Liyun Su, Min Sun, Chenlong Li, Xiangwu Peng
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.212004
Abstract:

QRS detection is very important in cardiovascular disease diagnosis and ECG (electrocardiogram) monitor, because it is the precondition of the calculation of correlative parameters and diagnosis. This paper presents a non-parametric derivative-based method for R wave detection in ECG signal. This method firstly uses a digital filter to cut out noises from ECG signals, utilizes local polynomial fitting that is a non-parametric derivative-based method to estimate the derivative values, and then selects appropriate thresholds by the difference, and the algorithm adaptively adjusts the size of thresholds periodically according to the different needs. Afterwards, the position of R wave is detected by the estimation of the first-order derivative values with nonparametric local polynomial statistical model. In addition, in order to improve the accuracy of detection, the method of redundant detection and missing detection are applied in this paper. The clinical experimental data are used to evaluate the effectiveness of the algorithm. Experimental results show that the method in the process of the detection of R wave is much smoother, compared with differential threshold algorithm and it can detect the R wave in the ECG signals accurately.

What Do We Mean When We Talk about the Linac Isocenter?  [PDF]
Mutian Zhang, Su-Min Zhou, Tanxia Qu
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2015, DOI: 10.4236/ijmpcero.2015.43028
Abstract: Purpose: The isocenter of a medical linac system is a frequently used concept in clinical practice. However, so far not all the isocenters are rigorously defined. This work is intended as an attempt of deriving consistent and operable isocenter definitions. Methods: The isocenter definition is based on a fundamental concept, the axis of rotation of a rigid body. The axis of rotation is determined using the trajectory of any point on a plane that intersects the rigid body. A point on the axis of rotation is found through the minimal bounding sphere of the trajectory when the rigid body makes a full rotation. The essential mathematical tool of the isocenter definition system is three-dimensional coordinate transformation. Results: The axes of rotation of the linac collimator, gantry, and couch are established first. The linac mechanical isocenter (linac isocenter) is defined as the center of a circle that best fits the trajectory of a select linac X-ray source position. The axis of rotation and the minimal bounding sphere are cornerstones for the rotation isocenters of the collimator, gantry and couch. The definition of radiation isocenter incorporates a surrogate of the useful beam axis. Conclusions: A framework of isocenter definitions for medical linacs is presented in this manuscript. Consistent meanings of the mechanical and radiation isocenters can be achieved using this approach.
The effect of dispersal on the population dynamics of a host-parasite system in fragmented landscape
扩散对破碎化景观上宿主-寄生种群动态的影响

SU Min,
苏敏

生态学报 , 2011,
Abstract: Landscape structure and dispersal strategy are two important factors affecting population dynamics and thus entail profound effects on biological invasions. However, insufficient attention has been paid to the combined effects of landscape structure and dispersal behavior on the epidemic transmission in spatially explicit landscapes. In this paper, pair approximation (a method from statistical physics for deriving ordinary differential equations that approximate the spatial dynamics of populations in a lattice environment) was applied to examine the impact of dispersal strategy, determined by the interplay between local and global host-parasite interactions, to the invasion and spread of epidemics on the fragmented landscape. The intensity of habitat destruction in the model, instead of undergoing a random loss, was quantified by the level of habitat loss and fragmentation. By incorporating the detailed information on dispersal strategy in the spatially structured landscape, we are able to address the following questions: (1) How does the dispersal pattern affect the invasion and transmission of the parasitic disease? (2) How does the impact of dispersal patterns depend on the landscape structure? By the use of invasion analysis and numerical simulations, the effect of global dispersal in hosts and parasites was found asymmetric in terms of the epidemic invasion and population dynamics. First, the global dispersal of parasites (epidemics) was shown to pose a much stronger impact than the global dispersal of hosts on the invasion threshold of the epidemic disease. Second, the average host density at the equilibrium state enhanced slightly with the increasing proportion of global dispersal in hosts, but declined dramatically with the increasing proportion of global dispersal in parasites. Finally, both the population density of hosts and parasites at equilibrium, measured by the relative occupancy, increased with the increasing proportion of global dispersal, but the impact of global dispersal on the population density of the parasites was more dramatic. Under different dispersal scenarios, high level of habitat loss and low level of habitat fragmentation were shown to be detrimental to the invasion of parasitic disease. The invasion threshold of parasitic disease was increased gradually with the increase of habitat loss, but declined monotonously with the increase of the clustering degree of lost patches. Meanwhile, the invasion threshold of parasitic disease reached the peak when all dispersal events were completely local; this indicates that local dispersal was preferred for controlling the invasion and spreading of disease. Results also showed that the mechanistic response of the invasion threshold to the proportion of local dispersal in all dispersal events could be altered under different levels of habitat destruction. When habitat destruction is severe (i.e. high proportion of habitat loss and low correlation between adjacent unsuitable habi
Virtual Full-Duplex Buffer-Aided Relaying in the Presence of Inter-Relay Interference
Su Min Kim,Mats Bengtsson
Mathematics , 2015,
Abstract: In this paper, we study virtual full-duplex (FD) buffer-aided relaying to recover the loss of multiplexing gain caused by half-duplex (HD) relaying in a multiple relay network, where each relay is equipped with a buffer and multiple antennas, through joint opportunistic relay selection (RS) and beamforming (BF) design. The main idea of virtual FD buffer-aided relaying is that the source and one of the relays simultaneously transmit their own information to another relay and the destination, respectively. In such networks, inter-relay interference (IRI) is a crucial problem which has to be resolved like self-interference in the FD relaying. In contrast to previous work that neglected IRI, we propose joint RS and BF schemes taking IRI into consideration by using multiple antennas at the relays. In order to maximize average end-to-end rate, we propose a weighted sum-rate maximization strategy assuming that adaptive rate transmission is employed in both the source to relay and relay to destination links. Then, we propose several BF schemes cancelling or suppressing IRI in order to maximize the weighted sum-rate. Numerical results show that our proposed optimal, zero forcing, and minimum mean square error BF-based RS schemes asymptotically approach the ideal FD relaying upper bound when increasing the number of antennas and/or the number of relays.
Influences of protein to energy ratios in breakfast on mood, alertness and attention in the healthy undergraduate students  [PDF]
Yao-Chi Zeng, Shun-Min Li, Guo-Liang Xiong, Hui-Min Su, Jian-Cheng Wan
Health (Health) , 2011, DOI: 10.4236/health.2011.36065
Abstract: Background: The high protein (HP) breakfast reduced gastric emptying and the most satiat-ing macronutrient appears to be dietary protein. Few studies have investigated the effects of protein to energy ratio in breakfast on mood, alertness and attention. Objective: This study was designed to investigate whether the HP breakfast is more beneficial to mood, alertness and attention of the healthy undergraduate student than adequate-protein (AP) breakfast through the rising body temperature and re-maining stable blood glucose or through other physiologic processes. Methods: Thirteen healthy male undergraduate students (18 - 23 y) were studied in a double-blind, randomized crossover design. Blood samples, body tem-perature, satiety, mood and Continuous Per-formance Test (CPT) were assessed after the consumption of two isocaloric breakfasts that differed in their protein and carbohydrate con-tent: an HP breakfast (50%, 30%, and 20% of energy from protein, carbohydrate, and fat, re-spectively) or an AP breakfast (10%, 70%, and 20% of energy from protein, carbohydrate, and fat, respectively). Results: Consumption of an HP breakfast resulted in more steady glucose and insulin than AP breakfast consumption (p < 0.05). Satiety scores and body temperature were higher after HP breakfast consumption (p < 0.05). And most important, the positive mood and CPT scores were higher after HP breakfast than after AP breakfast intake (p < 0.05). Conclusion: HP breakfast can effectively stabilize postprandial serum glucose concentration and elevate post-prandial temperature of healthy male under-graduate students. Our present findings dem-onstrate the relationship between HP breakfast and mood, alertness and attention. This study indicated that HP breakfast may enhance human performance probably by increasing the thermic effect of a food and elevating body temperature.
Commutative Pseudo Valuations on BCK-Algebras
Myung Im Doh,Min Su Kang
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/754047
Abstract: The notion of a commutative pseudo valuation on a BCK-algebra is introduced, and its characterizations are investigated. The relationship between a pseudo valuation and a commutative pseudo-valuation is examined.
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