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Search Results: 1 - 10 of 82622 matches for " Hang Liu "
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Research on Module Selection Method Based on the Integration of Kano Module with QFD Method  [PDF]
Hang Liu
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.52025
Abstract: To solve the challenge of deciding which modules should be chosen when developing new products, a new methodology has been proposes. This module selection method combines Kano model into a QFD framework to get the final importance of modules. The QFD approach is first applied to get initial importance ratio. Then, the application of the Kano model adjusts the importance ratio with a consideration of overall satisfaction. Thereafter, the final relative importance can be determined by using QFD function. A process model is given to apply the method successfully and unambiguously. Finally, the feasibility and efficiency of this method is demonstrated by a case study.
Study on Module Selection Method for Customized Products  [PDF]
Hang Liu
Intelligent Control and Automation (ICA) , 2014, DOI: 10.4236/ica.2014.54026
Abstract: Modularization is the key technique for modern manufacturing system, which resolves the conflict between flexibility and productivity. The challenge of deciding which modules should choose under resource limitation from a large amount of available alternative modules has been well recognized in academia and industry correspondingly in producing customized production. For this reason, this paper proposes a new module selection method to deal with the problem, which combines rough set theory into total quality development (QFD) framework. First of all, a decision table is build up and then be modified through examining the importance of each attribute. Afterwards, the basic importance rating vector is calculated and the modifying index of the importance will be determined to get the final result. Finally, the feasibility and efficiency of the proposed method is manifested by a case study.
Metal Oxide Gas Sensor Drift Compensation Using a Dynamic Classifier Ensemble Based on Fitting
Hang Liu,Zhenan Tang
Sensors , 2013, DOI: 10.3390/s130709160
Abstract: Sensor drift is currently the most challenging problem in gas sensing. We propose a novel ensemble method with dynamic weights based on fitting (DWF) to solve the gas discrimination problem, regardless of the gas concentration, with high accuracy over extended periods of time. The DWF method uses a dynamic weighted combination of support vector machine (SVM) classifiers trained by the datasets that are collected at different time periods. In the testing of future datasets, the classifier weights are predicted by fitting functions, which are obtained by the proper fitting of the optimal weights during training. We compare the performance of the DWF method with that of competing methods in an experiment based on a public dataset that was compiled over a period of three years. The experimental results demonstrate that the DWF method outperforms the other methods considered. Furthermore, the DWF method can be further optimized by applying a fitting function that more closely matches the variation of the optimal weight over time.
Thermodynamic and Experimental Analysis of an Ammonia-Water Absorption Chiller  [PDF]
Dingfeng Kong, Jianhua Liu, Liang Zhang, Hang He, Zhiyun Fang
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24042
Abstract: A single stage ammonia-water absorption chiller with complete condensation is designed, built and tested. The apparatus is designed for a cooling capacity of 2814 W, which is obtained using electric heater as heating source. The thermodynamic models have been derived using the First and Second Laws. Calculated results are compared with experimental data. The results show that the cooling capacity of experimental apparatus is found between 1900 and 2200 W with the actual coefficient of performance (COP) between 0.32 and 0.36. The contribution of the components to internal entropy production is analyzed. It shows that the larger irreversibility is caused by spanning the largest temperature and dissipated thermal energy by heat transfer losses at the generator and evaporator. In the experimentation, the low pressure is lower than the designed value. This is a consequence of a large capacity in the falling film absorber which performs as expected. This decreases the evaporation pressure, and the evaporating temperature could be reduced to the designed value.
On K_2 of certain families of curves
Hang Liu,Rob de Jeu
Mathematics , 2014,
Abstract: We construct families of smooth, proper, algebraic curves in characteristic 0, of arbitrary genus g, together with g elements in the kernel of the tame symbol. We show that those elements are in general independent by a limit calculation of the regulator. Working over a number field, we show that in some of those families the elements are integral. We determine when those curves are hyperelliptic, finding, in particular, that over any number field we have non-hyperelliptic curves of all composite genera g with g independent integral elements in the kernel of the tame symbol.
Genetic Polymorphisms of XRCC1 and Leukemia Risk: A Meta-Analysis of 19 Case-Control Studies
Haijun Zhang, Hang Liu, Gaofeng Jiang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080687
Abstract: Objective Three common X-ray repair cross-complementing groups 1 (XRCC1) polymorphisms, Arg399Gln, Arg194Trp, and Arg280His, have been reported to be implicated in the development of leukemia. However, previous results from different studies were inconsistent. Consequently, we performed a meta-analysis in order to accurately evaluate the association between XRCC1 Arg399Gln, Arg194Trp, and Arg280His polymorphisms and leukemia risk. Methods Through computerized searching of PubMed, ISI Web of Knowledge, Cochrane, EBSCO, and OpenGrey databases, and manually searching relevant references, a total of 19 studies with 3387 cases and 6168 controls for Arg399Gln (G>A) polymorphism, 12 studies with 2043 cases and 4550 controls for Arg194Trp (C>T), and 6 studies with 1445 cases and 1905 controls for Arg280His (G>A) were collected to perform meta-analysis and stratified analysis to explore the associations between these variants and leukemia susceptibility. Based on three genetic models, the codominant model, dominant model and recessive model, odds ratios (ORs) as well as their 95% confidence intervals (CIs) were used to evaluate the association strength between XRCC1 genotypes and leukemia risk. Results With respect to overall leukemia susceptibility, no association was detected. In stratified analyses by tumor type, Arg399Gln was associated with higher acute lymphoblastic leukemia (ALL) risk (AA vs. GG, OR = 1.50, 95% CI: 1.11-2.02; AA+GA vs. GG, OR = 1.35, 95% CI: 1.02-1.78). Additionally, Arg399Gln, Arg194Trp, and Arg280His may influence the susceptibilities of some leukemia type and race populations. Conclusion This meta-analysis indicates these three polymorphisms of XRCC1 do not associate with overall leukemia risks but could be associated with the risks for some specific subgroups.
Effects of a Traditional Japanese Medicine Goshajinkigan, Tokishigyakukagoshuyushokyoto on the Warm and Cold Sense Threshold and Peripheral Blood Flow  [PDF]
Rika Tsukada, Takuji Yamaguchi, Liu Hang, Masako Iseki, Hiroyuki Kobayashi, Eiichi Inada
Health (Health) , 2014, DOI: 10.4236/health.2014.68097
Abstract: The purpose of this study was to investigate the effects of a traditional Japanese medicine Goshajinkigan (TJ-107) and Tokishigyakukagoshuyushokyoto (TJ-38) on warm sense threshold, cold sense threshold and the peripheral blood flow. 31 healthy volunteers (control group: 9people, TJ-107 group: 12 people, TJ-38group:10 people) were examined. Drugs administered 2.5 g a dose. Analysis was before and after 1 hour dosage. The warm and cold sense threshold in the thenar of the non-handedness site of these subjects was measured using a thermostimulator (Intercross-200, Intercross Co., Tokyo, Japan). The peripheral blood flow in the finger of the non-handedness site of these subjects was measured using a full-field laser perfusion imager (FLPI, Moor Instruments Ltd., England). Control: The vehicle had no significant effect on the warm sense threshold, cold sense threshold and the peripheral blood flow. TJ-107: The warm sense threshold and cold sense threshold were significantly decreased, and the reaction latency of cold sense was significantly shortening. The peripheral blood flow was significantly increased second and third finger at 115.6%, 119.3%, respectively. TJ-38: The cold sense threshold and the reaction latency of cold sense were significantly increased. The peripheral blood flow was significantly increased second and third finger with 114.3%, 112.8%, respectively. These results suggest that TJ-107 and TJ-38 have effects on the changed warm sense threshold, cold sense threshold and increased peripheral blood flow.
The Impact of Chronic Social Stress on Emotional Behavior in Mice and the Therapeutic Effect of Peripheral Mild-Heat Stimulation  [PDF]
Hang Liu, Takuji Yamaguchi, Kenji Ryotokuji, Satoru Otani, Hiroyuki Kobayashi, Masako Iseki, Eichi Inada
Health (Health) , 2015, DOI: 10.4236/health.2015.710144
Abstract: In today’s stressful society, mental diseases such as adjustment disorder, affective disorders including anxiety and depression, and chronic fatigue syndrome could be attributed to social stress and are considered as serious social problems. It has been long known in the acupuncture and moxibustion therapies in Japan and China that stimulation at Zhongwan and Taichong points have effects on stress-related anxiety and depression. In the present study, we therefore tested the effect of peripheral mild-heat stimulation at Zhongwan and Taichong on anxiety and brain biochemistry using a mouse model of chronic social stress. Male ddY mice (4 weeks old) were stressed by isolated rearing for 6 weeks. They received mild-heat stimulation (43℃?for 5 min) at Zhongwan and Taichong under isoflurane anesthesia after 4 weeks of the social isolation 3 times a week for 2 weeks, using the “Stress Free Apparatus” (Ryoken Co., Ltd). Control mice received only isoflurane anesthesia. Group-reared mice also underwent the same stimulus/anesthesia sessions. Two days after the last peripheral heat stimulation, anxiety was determined by the light/dark box test as the time spent in the light compartment and the number of transfer between the light and dark compartments. Before and after the last stimulation, blood was collected from an artery at the back of the eye, and serum corticosterone, immunoglobulin E (IgE) which was an index of the inflammatory immune system, and interleukin 6 (IL-6) were measured using ELISA Kit. The frontal cortex was collected after the behavioral test, and the dopamine and serotonin contents were measured also by ELISA Kit. A significant decrease of the time spent in the light compartment was observed after the isolated rearing (p < 0.01). Mild-heat stimulation significantly increased the time spent in the light compartment, indicating an anti-anxiety effect. Serum corticosterone, IgE and IL-6 were increased after stress, and the amount of serotonin in the frontal cortex was found decreased. The increased corticosterone, IgE and IL-6 were cancelled by mild-heat stimulation. These results suggest that chronic social isolation has negative biological and emotional impacts in mice and that peripheral mild-heat stimulation alleviates at least part of these stress effects.
$Ω_{ccc}$ Production in High Energy Nuclear Collisions
Hang He,Yunpeng Liu,Pengfei Zhuang
Physics , 2014, DOI: 10.1016/j.physletb.2015.04.049
Abstract: We investigate the production of $\Omega_{ccc}$ baryon in high energy nuclear collisions via quark coalescence mechanism. The wave function of $\Omega_{ccc}$ is solved from the Schr\"odinger equation for the bound state of three charm quarks by using the hyperspherical method. The production cross section of $\Omega_{ccc}$ per binary collision in a central Pb+Pb collision at $\sqrt{s_{NN}}=2.76$ TeV reaches 9 nb, which is at least two orders of magnitude larger than that in a p+p collision at the same energy. Therefore, it is most probable to discover $\Omega_{ccc}$ in heavy ion collisions at LHC, and the observation will be a clear signature of the quark-gluon plasma formation.
New emission phase of the Be/X-ray binary X Persei: nearly simultaneous spectroscopic and near-infrared observations
Q. Z. Liu,H. R Hang
Physics , 2001,
Abstract: We present a series of optical spectroscopic and near-infrared photometric observations of the Be star X Persei, from the beginning of the recent emission phase. Our data show that after the latest extended low state (ELS), both the equivalent width (EW) of the H\alpha emission line and the JHK luminosities gradually increased. The recent maximum H\alpha EW and JHK magnitudes are more than but comparable to the 1986-1989 maxima, which reflects a more extensive and denser envelope in the new emission phase. The IR photometry and the H\alpha EW increase coincidently in the early stage of the new emission phase. However, the variations in the following years, specially in 1994 and 1995, are much different from the early variations. An unusual variation that while the H\alpha EW in X Per increases considerably, the JHK magnitudes decline rapidly is seen in our nearly simultaneous pectroscopic and near-infrared observations. An expanding ring model is put forward to interpret the observed unusual variations between the H\alpha EW and near-IR luminosity during the recent emission phase of X Persei. Our results indicate that although both infrared excess and H\alpha emission line arise from the envelope, their main ontributors, in some cases, are likely to originate in the different part of the envelope.
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