AIM To evaluate the short health scale(SHS),a new,simple,four-part visual analogue scale questionnaire that is designed to assess the impact of inflammatory bowel disease(IBD)on health-related quality of life(HRQOL),i...AIM To evaluate the short health scale(SHS),a new,simple,four-part visual analogue scale questionnaire that is designed to assess the impact of inflammatory bowel disease(IBD)on health-related quality of life(HRQOL),in Korean-speaking patients with IBD.METHODS The SHS was completed by 256 patients with Crohn’s disease(CD)and ulcerative colitis(UC).Individual SHS items were correlated with inflammatory bowel disease questionnaire(IBDQ)dimensions and with disease activity to assess validity.Test-retest reliability,responsiveness and patient or disease characteristics with probable association with high SHS scores were analyzed.RESULTS Of 256 patients with IBD,139(54.3%)had UC and 117(45.7%)had CD.The correlation coefficients between SHS questions about"symptom burden","activities of daily living",and"disease-related worry"and their corresponding dimensions in the IBDQ ranged from0.62 to 0.71,compared with correlation coefficients ranging from-0.45 to-0.61 for their non-corresponding dimensions.There was a stepwise increase in SHS scores,with increasing disease activity in both CD and UC(all P values<0.001).Reliability was confirmed with test-retest correlations ranging from 0.68 to 0.90(all P values<0.001).Responsiveness was confirmed with the patients who remained in remission.Their SHS scores remained unchanged,except for the SHS dimension"disease-related worry".In the multivariate analysis,female sex was associated with worse"general well-being"(OR=2.28,95%CI:1.02-5.08)along with worse disease activity.CONCLUSION The SHS is a valid and reliable measure of HRQOL in Korean-speaking patients with IBD.展开更多
This paper presents research on a free boundary value problem arising in a nonlinear n-diffiision equation by using a homotopy analysis method(HAM).Approximate analytical solutions are obtained for special nonlinear d...This paper presents research on a free boundary value problem arising in a nonlinear n-diffiision equation by using a homotopy analysis method(HAM).Approximate analytical solutions are obtained for special nonlinear diffusion functional coefficient(variable thermal conduction)k(s)=s{i}for i=1,3,5 and convection functional coefficient h(s)=s{j}for j=1,4 and power law parameter of n=0.2,0.5,1.0,2.5.Reliability and efficiency of the approximate solutions are verified by numerical ones showing good agreement.The effects of the power law exponent,the nonlinear diffusion or convection functional coefficients,and the free boundary'parameter on the flux transport characteristics are presented graphically and analyzed in detail.The mathematical techniques employed in this paper have the significance in studying some other problems of engineering.展开更多
We study the propagation of spatial solitons in nematic liquid crystals, using the self-similar method. Analytical solutions in the form of self-similar solitons are obtained exactly. We confirm the stability of these...We study the propagation of spatial solitons in nematic liquid crystals, using the self-similar method. Analytical solutions in the form of self-similar solitons are obtained exactly. We confirm the stability of these solutions by direct numerical simulation, and find that the stable spatial solitons can exist in various forms, such as Oaussian solitons, radially symmetric solitons, multipole solitons, and soliton vortices.展开更多
Collisions of spatial solitons occurring in the nonlinear Schroeinger equation with harmonic potential are studied, using conservation laws and the split-step Fourier method. We find an analytical solution for the sep...Collisions of spatial solitons occurring in the nonlinear Schroeinger equation with harmonic potential are studied, using conservation laws and the split-step Fourier method. We find an analytical solution for the separation distance between the spatial solitons in an inhomogeneous nonlinear medium when the light beam is self-trapped in the transverse dimension. In the self-focusing nonlinear media the spatial solitons can be transmitted stably, and the interaction between spatial solitons is enhanced due to the linear focusing effect （and also diminished for the linear defocusing effect）. In the self-defocusing nonlinear media, in the absence of self-trapping or in the presence of linear self-defocusing, no transmission of stable spatial solitons is possible. However, in such media the linear focusing effect can be exactly compensated, and the spatial solitons can propagate through.展开更多
文摘AIM To evaluate the short health scale(SHS),a new,simple,four-part visual analogue scale questionnaire that is designed to assess the impact of inflammatory bowel disease(IBD)on health-related quality of life(HRQOL),in Korean-speaking patients with IBD.METHODS The SHS was completed by 256 patients with Crohn’s disease(CD)and ulcerative colitis(UC).Individual SHS items were correlated with inflammatory bowel disease questionnaire(IBDQ)dimensions and with disease activity to assess validity.Test-retest reliability,responsiveness and patient or disease characteristics with probable association with high SHS scores were analyzed.RESULTS Of 256 patients with IBD,139(54.3%)had UC and 117(45.7%)had CD.The correlation coefficients between SHS questions about"symptom burden","activities of daily living",and"disease-related worry"and their corresponding dimensions in the IBDQ ranged from0.62 to 0.71,compared with correlation coefficients ranging from-0.45 to-0.61 for their non-corresponding dimensions.There was a stepwise increase in SHS scores,with increasing disease activity in both CD and UC(all P values<0.001).Reliability was confirmed with test-retest correlations ranging from 0.68 to 0.90(all P values<0.001).Responsiveness was confirmed with the patients who remained in remission.Their SHS scores remained unchanged,except for the SHS dimension"disease-related worry".In the multivariate analysis,female sex was associated with worse"general well-being"(OR=2.28,95%CI:1.02-5.08)along with worse disease activity.CONCLUSION The SHS is a valid and reliable measure of HRQOL in Korean-speaking patients with IBD.
基金supported by the National Natural Science Foundation of China(Nos.51276014 and 51476191)supported by Qatar National Research Fund's National Priority Research Project(NPRP)5-674-1-114.
文摘This paper presents research on a free boundary value problem arising in a nonlinear n-diffiision equation by using a homotopy analysis method(HAM).Approximate analytical solutions are obtained for special nonlinear diffusion functional coefficient(variable thermal conduction)k(s)=s{i}for i=1,3,5 and convection functional coefficient h(s)=s{j}for j=1,4 and power law parameter of n=0.2,0.5,1.0,2.5.Reliability and efficiency of the approximate solutions are verified by numerical ones showing good agreement.The effects of the power law exponent,the nonlinear diffusion or convection functional coefficients,and the free boundary'parameter on the flux transport characteristics are presented graphically and analyzed in detail.The mathematical techniques employed in this paper have the significance in studying some other problems of engineering.
基金supported by National Natural Science Foundation of China under Grant No.2006CB921605the Science Research Foundation of Shunde College
文摘We study the propagation of spatial solitons in nematic liquid crystals, using the self-similar method. Analytical solutions in the form of self-similar solitons are obtained exactly. We confirm the stability of these solutions by direct numerical simulation, and find that the stable spatial solitons can exist in various forms, such as Oaussian solitons, radially symmetric solitons, multipole solitons, and soliton vortices.
基金National Basic Research Program of China under Grant No.2006CB921605the Science Research Foundation of Shunde College of China
文摘Collisions of spatial solitons occurring in the nonlinear Schroeinger equation with harmonic potential are studied, using conservation laws and the split-step Fourier method. We find an analytical solution for the separation distance between the spatial solitons in an inhomogeneous nonlinear medium when the light beam is self-trapped in the transverse dimension. In the self-focusing nonlinear media the spatial solitons can be transmitted stably, and the interaction between spatial solitons is enhanced due to the linear focusing effect （and also diminished for the linear defocusing effect）. In the self-defocusing nonlinear media, in the absence of self-trapping or in the presence of linear self-defocusing, no transmission of stable spatial solitons is possible. However, in such media the linear focusing effect can be exactly compensated, and the spatial solitons can propagate through.
