Xing Wu

Shanghai University, Shanghai, Shanghai Shi, China

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Publications (18)8.73 Total impact

  • Xing Wu · Hai-tao Lü · Shao-jian Zhuo
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    ABSTRACT: The mass data of social media and social networks generated by users play an important role in tracking users’ sentiments and opinions online. A good polarity lexicon which can effectively improve the classification results of sentiment analysis is indispensable to analyze the user’s sentiments. Inspired by social cognitive theories, we combine basic emotion value lexicon and social evidence lexicon to improve traditional polarity lexicon. The proposed method obtains significant improvement in Chinese text sentiment analysis by using the proposed lexicon and new syntactic analysis method.
    No preview · Article · Feb 2015 · Journal of Shanghai Jiaotong University (Science)
  • Xing Wu · Shaojian Zhuo

    No preview · Article · Oct 2014

  • No preview · Conference Paper · Aug 2014
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    ABSTRACT: Many recent studies of sentiment analysis have shown that a polarity lexicon can effectively improve the classification results. Social media and Social networks, spontaneously user generated content have become important materials for tracking people's opinions and sentiments online. The mathematical models of fuzzy semantics have provided a formal explanation for the fuzzy nature of human language processing. In this paper we investigate the limitations of traditional sentiment analysis approaches and proposed a better Chinese sentiment analysis approach based on fuzzy semantic model. By using the emotion degree lexicon and fuzzy semantic model, this new approach obtains significant improvement in Chinese text sentiment analysis.
    No preview · Conference Paper · Aug 2014
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    ABSTRACT: DNA sequences have the fundamental information for each species and a comparison between DNA sequences is one of the basic biological problems. There are a large number of algorithms applying in sequence alignment. Some are for approximate alignment, and others are for exact alignment, which also plays an important role in biology research. In this paper, a new parallel algorithm based on FED algorithm for exact sequences alignment with MPI is proposed. The experimental results indicate that the proposed algorithm can report the matched positions in the specific sequence and improve the matching speed with MPI, as well as reduce the storage requirement.
    No preview · Conference Paper · Apr 2014
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    ABSTRACT: Aims/IntroductionTo compare carotid and lower limb atherosclerotic lesions, and examine if carotid atherosclerotic lesions are in line with lower limb atherosclerotic lesions, and can reflect generalized atherosclerosis in inpatients with type 2 diabetes. Materials and Methods This was an observational study carried out in 867 Chinese inpatients with type 2 diabetes, including 573 previously known and 294 newly diagnosed patients. Ultrasonographic assessments of intima-media thickness (IMT), plaques, and stenosis in the carotid and lower limb arteries were evaluated. Atherosclerotic lesions between the carotid and lower limb arteries were compared in both previously known and newly diagnosed diabetes, respectively. ResultsIn both the known (77.3% vs 49.4%, P < 0.001) and the newly diagnosed diabetes (55.4% vs 29.9%, P < 0.001), the prevalence of atherosclerotic plaques was significantly higher in the lower limb arteries than in the carotid arteries. Likewise, the prevalence of stenosis was also significantly higher (P < 0.001) in the lower limb arteries (16.9%) than in the carotid arteries (4.2%) in the established diabetes patients. However, there was no significant difference in the mean IMT between common carotid and common femoral arteries in both the previously known (0.90 ± 0.24 mm vs 0.89 ± 0.20 mm, P = 0.675) and the newly diagnosed diabetes patients (0.86 ± 0.22 mm vs 0.85 ± 0.16 mm, P = 0.436). Conclusions Carotid plaques might underestimate generalized plaques in inpatients with type 2 diabetes, as shown by its significantly lower prevalence compared with that of the lower extremity arteries. A combined carotid and lower limb ultrasound examination can improve the detection of atherosclerotic lesions in inpatients with type 2 diabetes.
    Full-text · Article · Mar 2014
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    ABSTRACT: A diagnosis of subacute thyroiditis is readily considered when patients present with a particular set of typical clinical characteristics. Subacute thyroiditis sometimes presents as a solitary cold nodule; however, the presence of a hot nodule in patients with subacute thyroiditis is exceedingly rare. Here, the case of a 57-year-old woman complaining of pain in the left neck and fatigue for two weeks is presented. Physical examination revealed a painful and tender nodule with a diameter of approximately 1.5 cm in the left neck, although all laboratory tests, including white blood cell count, neutrophil percentage, erythrocyte sedimentation rate (ESR), thyroid function, and thyroglobin levels, were normal. A neck ultrasound revealed a hypoechoic mass (1.5 x 0.8 cm) in the left thyroid, and thyroid scintigraphy of the left thyroid with Technetium-99 m (99 m-Tc) demonstrated a focal accumulation of radiotracer. Furthermore, fine-needle aspiration biopsy from the nodule revealed the presence of multinuclear giant cells. The patient was well; there was no cervical mass detected upon palpation following two months of prednisone treatment, and follow-up ultrasound screening and scintigraphy demonstrated the disappearance of the nodule. This case, presenting with a localized painful hot nodule, normal thyroid function, normal ESR, and normal serum thyroglobulin levels, is a rare case of subacute thyroiditis, which should be considered during differential diagnosis.
    Full-text · Article · Jan 2014 · BMC Endocrine Disorders
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    ABSTRACT: Background The features of carotid atherosclerosis in ketosis-onset diabetes have not been investigated. Our aim was to evaluate the prevalence and clinical characteristics of carotid atherosclerosis in newly diagnosed Chinese diabetic patients with ketosis but without islet-associated autoantibodies. Methods In total, 423 newly diagnosed Chinese patients with diabetes including 208 ketosis-onset diabetics without islet-associated autoantibodies, 215 non-ketotic type 2 diabetics and 79 control subjects without diabetes were studied. Carotid atherosclerosis was defined as the presence of atherosclerotic plaques in any of the carotid vessel segments. Carotid intima-media thickness (CIMT), carotid atherosclerotic plaque formation and stenosis were assessed and compared among the three groups based on Doppler ultrasound examination. The clinical features of carotid atherosclerotic lesions were analysed, and the risk factors associated with carotid atherosclerosis were evaluated using binary logistic regression in patients with diabetes. Results The prevalence of carotid atherosclerosis was significantly higher in the ketosis-onset diabetic group (30.80%) than in the control group (15.2%, p=0.020) after adjusting for age- and sex-related differences, but no significant difference was observed in comparison to the non-ketotic diabetic group (35.8%, p=0.487). The mean CIMT of the ketosis-onset diabetics (0.70±0.20 mm) was markedly higher than that of the control subjects (0.57±0.08 mm, p<0.001), but no significant difference was found compared with the non-ketotic type 2 diabetics (0.73±0.19 mm, p=0.582) after controlling for differences in age and sex. In both the ketosis-onset and the non-ketotic diabetes, the prevalence of carotid atherosclerosis was markedly increased with age (both p<0.001) after controlling for sex, but no sex difference was observed (p=0.479 and p=0.707, respectively) after controlling for age. In the ketosis-onset diabetics, the presence of carotid atherosclerosis was significantly associated with age, hypertension, low-density lipoprotein cholesterol and mean CIMT. Conclusions The prevalence and risk of carotid atherosclerosis were significantly higher in the ketosis-onset diabetics than in the control subjects but similar to that in the non-ketotic type 2 diabetics. The characteristics of carotid atherosclerotic lesions in the ketosis-onset diabetics resembled those in the non-ketotic type 2 diabetics. Our findings support the classification of ketosis-onset diabetes as a subtype of type 2 diabetes.
    Full-text · Article · Jan 2013 · Cardiovascular Diabetology
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    ABSTRACT: To deal with the challenge of the storage of mass data, we provide a kind of distributed file system to store the small images which size are under 100KB. For these huge amounts of data, a centralized file system can't meet the storage requirement. It is necessary to ensure the storage efficiency and fault-tolerant rate. Nowadays, most images which stored on the internet are very small. For these images, an efficient storage system and a management method are also crying needs. Similarly, how to retrieve the image effectively and how to classify the images are also challenges. So we aim at design a proprietary small images storage system based on distributed file system. Meanwhile, we contrast our distribution file system with HDFS and show the effectiveness's promotion.
    No preview · Conference Paper · Jan 2013
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    ABSTRACT: Cloud computing is the next generation of computing paradigm. Along with cloud computing, many related problems come up. And these problems in turn slow the speed of the development of cloud computing down. Among these problems, e.g. interoperability and privacy, identity management and security are strong concerned. Many researchers and enterprises have already done a lot to optimize the identity management and strengthen the security in cloud computing. Most of these studies focus on the usability of identity management and various kinds of method to help improve security. But in this paper, we do some research from a new angle. While the federated solution of identity management helps relieve many problems, it's adopted by many platforms and enterprises. The general approach for deploying identity management is a centralized component processing authentication and authorization requests. But with the cloud growing in scale and the increasing number of users, this centralized solution will be the bottleneck of the cloud. In this paper, we propose a decentralized approach for implementing identity management in service oriented architecture in cloud computing and a grouping algorithm as the deploy strategy. Security is another problem involved in this paper. Since many researchers have done many detailed and fruitful studies in security, the security solution illustrated in this paper is specific in the proposed architecture.
    No preview · Conference Paper · Nov 2012
  • Xing Wu · Wu Zhang · Dou Wanchun
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    ABSTRACT: Cloud computing is emerging as a model in support of "everything-as-a-service". Virtualized physical resources, virtualized infrastructure, as well as virtualized middleware platforms and business applications are being provided and consumed as services in the Cloud. In practice, cloud service providers tend to offer services that can be grouped into three categories: software as a service (Saas), platform as a service (Paas) and infrastructure as a service (Iaas). To maximize the revenue of providers and meet the demands of users, we proposed a personalized pricing strategy for cloud computing, which is defined as pricing as a service (Praas). Evaluation results demonstrate that the proposed pricing strategy allows on-demand uses of cloud resources and provides more revenue for cloud providers.
    No preview · Conference Paper · Oct 2012
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    ABSTRACT: To evaluate the prevalence of atherosclerosis detected by both carotid and lower extremity ultrasonography in hospitalized Chinese type 2 diabetic patients and to examine whether plaque formation in the carotid arteries could be an indicator of generalized atherosclerosis in type 2 diabetes mellitus. Totally, 709 hospitalized Chinese type 2 diabetic patients (men 357, women 352) aged from 18 to 88 years were included. Both carotid and lower extremity atherosclerosis were assessed by Doppler ultrasound. Atherosclerosis was defined as the presence of either the carotid or lower extremity plaque in any of the above-mentioned arteries segments. The prevalence of atherosclerosis was calculated, and the risk factors associated with atherosclerosis were evaluated using binary logistic regression. The prevalence of atherosclerosis was 81.23% in male and 77.56% in female type 2 diabetic patients, respectively. There was no significant difference in the prevalence of atherosclerosis in patients between the sexes. The prevalence of atherosclerosis was significantly higher in the lower extremity arteries than in the carotid arteries (73.91% and 44.43%, respectively, P<.001). Atherosclerosis was significantly associated with smoking, age, duration of diabetes, systolic blood pressure, total number of white blood cells, and mean carotid and femoral intima-media thickness (IMT). The prevalence of atherosclerosis was very high in Chinese inpatients with type 2 diabetes. Carotid atherosclerosis could not be an indicator of generalized atherosclerosis in type 2 diabetes. The combination of carotid and lower extremity ultrasound examination can significantly improve the detection of atherosclerosis in type 2 diabetes.
    Full-text · Article · Jan 2012 · Journal of diabetes and its complications
  • Hao Lu · Xing Wu · Wu Zhang · Jin Liu
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    ABSTRACT: Success of cloud computing service depends on an acceptable pricing model, especially in the PaaS. As a dynamic platform, PaaS layer depends on the infrastructure layer and extends to the application layer. How to find an optimal pricing policy is the problem for the cloud providers in face of stochastic and dynamic demand. In this paper, we present an approach of dynamic pricing model in order to get max profits. We analyze the model by a multi-condition hybrid system. But we also use a theory of revenue maximization and cost minimization. When at a current state, the system content cost minimization to build a hybrid system for revenue maximization, we will get the most profits.
    No preview · Conference Paper · Jan 2012
  • Xing Wu · Ming Chao Wang · Wu Zhang · Yike Guo
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    ABSTRACT: Cloud computing is the latest technology trend in delivering computing resources as a service. In practice, cloud service providers tend to offer services that can be grouped into three categories: software as a service (Saas), platform as a service (Paas) and infrastructure as a service (Iaas). Iaas is the delivery of hardware (server, storage and network) as a service. Cloud computing moves computations and data away from desktop PCs into large data centers. Traditional programs cannot bridge the separation between the possession and ownership of program from its use. To address this issue, cloud program with a pricing strategy for Iaas is proposed for cloud computing. Experimental results demonstrate that the proposed program allows on-demand uses of cloud resources and provides pay-as-you-go services, which outperforms traditional programs in cloud computing.
    No preview · Conference Paper · Jan 2012
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    ABSTRACT: Cloud computing as a new IT technology is burgeoning and an increasing number of providers are offering various web services related to cloud computing. Meanwhile, the demands of different kinds of users are also rising sharply. In order to maximize the revenue, a proper pricing model is in desperate need. Nowadays, most of the providers are using static pricing which neglects the changes of supply and demand. Since the web services are easy to access and can be used by a large number of users, a dynamic pricing model aimed at maximizing the revenue is proposed. Our dynamic pricing model can automatically adjust the prices of resources according to the demands from users and the pricing for packages is based on Apriori Algorithm. Furthermore, the dynamic pricing model also can be adjusted and optimized by Genetic Annealing Algorithm so as to well adapt to the changes of Supply and demand. Compared with the static pricing model, the dynamic pricing model can increase the revenue to a considerable extent.
    No preview · Conference Paper · Jan 2012
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    Xing Wu · Wu Zhang · Qing Li
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    ABSTRACT: Cine-MRI provides a well tolerated non-invasive method for the quantitative assessment of small bowel motility. The quantitative assessment of the small bowel motility reveals important information for the functional analysis of the small bowel. Traditionally the quantitative assessment is accomplished by detecting the peristaltic frequency of a specific small bowel segment within MRI sequences. Negative mutual information is proposed to assess the small bowel motility. A simulation of the small bowel motility is implemented, which proves that the proposed method can be utilized for the quantitative assessment. Experimental results demonstrate the accuracy of proposed method.
    Preview · Article · Dec 2011
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    ABSTRACT: Cloud computing is a promising technology, where the infrastructure, developing platform, software and storage are delivered as a service. With the development of cloud computing, more and more cloud service providers emerge. However, there are no metrics can be referred to compare these providers, so it is difficult for cloud consumers to select the most reliable providers or resources. Thus we present a platform of Services Level Agreement (SLA) in cloud computing. In the platform, we propose a Reputation System to evaluate the reliability of providers or resources to address this challenge, and we also propose a SLA template pool in order to make the SLA negotiation between cloud providers and cloud consumers become more equitable, transparent and convenient.
    No preview · Conference Paper · Dec 2011
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    ABSTRACT: As a new technology in IT industry, cloud computing has been much focused by both academia and industry. And many topics in cloud computing are under study. However, as one of the most important issue, billing and pricing has been not so much concerned. In this paper, we propose a novel pay-per-use billing model that can be used for the applications in cloud computing. Built based on leasing instances, the model is put forward according to the analysis of the real applications in the cloud computing environment. That is, with the model, the users will be charged totally by the amount of the resources they have used. Simulation results show that the model is correct and feasible.
    No preview · Conference Paper · May 2011