目的探索青年人牙髓感觉功能的生物节律,丰富牙髓时间生物学的理论基础,并指导牙髓病的临床诊断与治疗。方法40位健康青年受试者,其中男性20人,女性20人。用NEO SONO U ltim a EZTM牙髓活力测定仪于第一天的8:00至次日8:00每隔4 h的7个...目的探索青年人牙髓感觉功能的生物节律,丰富牙髓时间生物学的理论基础,并指导牙髓病的临床诊断与治疗。方法40位健康青年受试者,其中男性20人,女性20人。用NEO SONO U ltim a EZTM牙髓活力测定仪于第一天的8:00至次日8:00每隔4 h的7个时间点测试并记录牙髓活力阈值,测试结果取平均值。结果每位受试者24 h牙髓活力阈值数据经H a lberg余弦节律分析法统计分析,差异有统计学意义(P<0.05),活力阈值的最高峰和最低谷分别出现在0:00与12:00;青年男性女性受试者中值、振幅及相位的差异无统计学意义(P>0.05)。结论青年人牙髓感觉功能具有昼夜节律性变化,即0:00时牙髓感觉最迟钝,12:00时牙髓感觉最敏感。展开更多
Traditional information hiding algorithms cannot maintain a good balance of capacity,invisibility and robustness.In this paper,a novel blind colour image information hiding algorithm based on grey prediction and grey ...Traditional information hiding algorithms cannot maintain a good balance of capacity,invisibility and robustness.In this paper,a novel blind colour image information hiding algorithm based on grey prediction and grey relational analysis in the Discrete Cosine Transform(DCT) domain is proposed.First,this algorithm compresses the secret image losslessly based on the improved grey prediction GM(1,1)(IGM) model.It then chooses the blocks of rich texture in the cover image as the embedding regions using Double-dimension Grey Relational Analysis(DGRA).Finally,it adaptively embeds the compressed secret bits stream into the DCT domain mid-frequency coefficients,which are decided by those blocks' Double-Dimension Grey Correlation Degree(DGCD) and Human Visual System(HVS).This method can ensure an adequate balance between invisibility,capacity and robustness.Experimental results show that the proposed algorithm is robust against JPEG compression(46.724 6 dB when the compression quality factor is 90%),Gaussian noise(45.531 3 dB when the parameter is(0,0.000 5)) etc.,and it is a blind information hiding algorithm that can be extracted without an original carrier.展开更多
In this paper, the truncated Painleve analysis and the consistent tanh expansion （CTE） method are developed for the （2＋1）-dimensional breaking soliton equation. As a result, the soliton-cnoidal wave interaction s...In this paper, the truncated Painleve analysis and the consistent tanh expansion （CTE） method are developed for the （2＋1）-dimensional breaking soliton equation. As a result, the soliton-cnoidal wave interaction solution of the equation is explicitly given, which is dimcult to be found by other traditional methods. When the value of the Jacobi elliptic function modulus rn = 1, the soliton-cnoidal wave interaction solution reduces back to the two-soliton solution. The method can also be extended to other types of nonlinear evolution equations in mathematical physics.展开更多
文摘目的探索青年人牙髓感觉功能的生物节律,丰富牙髓时间生物学的理论基础,并指导牙髓病的临床诊断与治疗。方法40位健康青年受试者,其中男性20人,女性20人。用NEO SONO U ltim a EZTM牙髓活力测定仪于第一天的8:00至次日8:00每隔4 h的7个时间点测试并记录牙髓活力阈值,测试结果取平均值。结果每位受试者24 h牙髓活力阈值数据经H a lberg余弦节律分析法统计分析,差异有统计学意义(P<0.05),活力阈值的最高峰和最低谷分别出现在0:00与12:00;青年男性女性受试者中值、振幅及相位的差异无统计学意义(P>0.05)。结论青年人牙髓感觉功能具有昼夜节律性变化,即0:00时牙髓感觉最迟钝,12:00时牙髓感觉最敏感。
基金sponsored by the National Natural Science Foundation of China under Grants No.61170065,No.61003039,No.61202355the Science and Technology Support Project of Jiangsu under Grant No.BE2012183+4 种基金the Natural Science Key Fund for Colleges and Universities in Jiangsu Province under Grant No.12KJA520002the Postdoctoral Fund under Grants No.1101011B,No.2012M511753the Fund for Nanjing University of Posts and Telecommunications under Grant No.NY212047Fund of Jiangsu Computer Information Processing Technology Key Laboratory under Grant No.KJS1022the Priority Academic Program Development of Jiangsu Higher Education Institutions under Grant No.yx002001
文摘Traditional information hiding algorithms cannot maintain a good balance of capacity,invisibility and robustness.In this paper,a novel blind colour image information hiding algorithm based on grey prediction and grey relational analysis in the Discrete Cosine Transform(DCT) domain is proposed.First,this algorithm compresses the secret image losslessly based on the improved grey prediction GM(1,1)(IGM) model.It then chooses the blocks of rich texture in the cover image as the embedding regions using Double-dimension Grey Relational Analysis(DGRA).Finally,it adaptively embeds the compressed secret bits stream into the DCT domain mid-frequency coefficients,which are decided by those blocks' Double-Dimension Grey Correlation Degree(DGCD) and Human Visual System(HVS).This method can ensure an adequate balance between invisibility,capacity and robustness.Experimental results show that the proposed algorithm is robust against JPEG compression(46.724 6 dB when the compression quality factor is 90%),Gaussian noise(45.531 3 dB when the parameter is(0,0.000 5)) etc.,and it is a blind information hiding algorithm that can be extracted without an original carrier.
基金Supported by National Natural Science Foundation of China under Grant Nos.11271211,11275072,11435005K.C.Wong Magna Fund in Ningbo University
文摘In this paper, the truncated Painleve analysis and the consistent tanh expansion （CTE） method are developed for the （2＋1）-dimensional breaking soliton equation. As a result, the soliton-cnoidal wave interaction solution of the equation is explicitly given, which is dimcult to be found by other traditional methods. When the value of the Jacobi elliptic function modulus rn = 1, the soliton-cnoidal wave interaction solution reduces back to the two-soliton solution. The method can also be extended to other types of nonlinear evolution equations in mathematical physics.
