The brain is a highly complex system. Under-standing the behavior and dynamics of billions of interconnected neurons from the brain signal requires knowledge of several signal- process-ing techniques, from the linear ...The brain is a highly complex system. Under-standing the behavior and dynamics of billions of interconnected neurons from the brain signal requires knowledge of several signal- process-ing techniques, from the linear and non-linear domains. The analysis of EEG signals plays an important role in a wide range of applications, such as psychotropic drug research, sleep studies, seizure detection and hypnosis proc-essing. In this paper we accomplish to analyze and explore the nature of hypnosis in Right, Left, Back and Frontal hemisphere in 3 groups of hypnotizable subjects by means of Fuzzy Simi-larity Index method.展开更多
The advance of fluid dynamics may be divided into four stages： ancient, classical, neoteric, and contem- porary. A similar four-stage framework can be used to describe the advance of synoptic meteorology, such as the...The advance of fluid dynamics may be divided into four stages： ancient, classical, neoteric, and contem- porary. A similar four-stage framework can be used to describe the advance of synoptic meteorology, such as the conceptual models of extratropical cyclones and their attendant fronts. The first conceptual model of extratropical cyclones was proposed by Admiral FitzRoy in 1863. Based purely on Admiral FitzRoy＇s personal experience （although it does contain some scientific essentials）, this model represents the “ancient” stage of synoptic meteorology. The Norwegian cyclone model was developed based on Newtonian mechanics about 100 yr ago, and represents the classical stage of synoptic meteorology. This model was based on the idea that weather changes are primarily caused by baroclinicity, but contain some serious flaws. In particu- lar, the Norwegian model regards fronts as zeroth-order discontinuities in density, which is inconsistent with the continuity principle of fluid dynamics. The Chicago three-dimensional conceptual model of fronts and cyclones, which was developed approximately 50 yr ago by using quasi-geostrophic theory, can be thought of as representing the neoteric stage of synoptic meteorology. The Chicago model was replaced in the late 20th century by a model of extratropical cyclones characterized by back-bent and wrap-up warm fronts. This model has been developed with massive numerical calculations, and represents the contemporary stage of synoptic meteorology. In the era of large data, contemporary synoptic meteorology should be careful to maintain and make full use of the profound physical understanding generated during the neoteric stage of synoptic meteorology.展开更多
文摘The brain is a highly complex system. Under-standing the behavior and dynamics of billions of interconnected neurons from the brain signal requires knowledge of several signal- process-ing techniques, from the linear and non-linear domains. The analysis of EEG signals plays an important role in a wide range of applications, such as psychotropic drug research, sleep studies, seizure detection and hypnosis proc-essing. In this paper we accomplish to analyze and explore the nature of hypnosis in Right, Left, Back and Frontal hemisphere in 3 groups of hypnotizable subjects by means of Fuzzy Simi-larity Index method.
文摘目的探讨功能性近红外光谱成像(functional near-infrared spectroscopy,fNIRS)对重性抑郁障碍(Major Depressive Disorder,MDD)患者的N-back表现及相关脑区激活情况。方法去符合美国《精神障碍诊断与统计手册第5版》(diagnostic and statistical manual of mental disorders,5th Edition,DSM-5)诊断标准的抑郁障碍患者26例为研究对象,并选择22名正常成人作为对照。使用17项汉密尔顿抑郁量表(17-item Hamilton depression scale,HAMD-17)评定患者抑郁症状,数字N-back测试评估工作记忆,应用fNIRS测量执行N-back任务时额叶脑区的激活情况。结果①在正确率和反应时间上,负荷水平主效应显著(P<0.05),组别和负荷水平的交互作用显著(P<0.05)。进行简单效应分析发现,在0-back条件下,MDD患者的正确率和反应时间与健康成人不存在显著差异(P>0.05),在1-back和2-back条件下,MDD患者的正确率和反应时间存在显著性差异(P<0.05)。②与健康对照组相比,MDD患者在2-back任务中,背外侧前额叶皮层(通道3、4、5、6、8)和额极皮层(通道47)氧合血红蛋白(Oxyhemoglobin,Oxy-Hb)的激活明显减少(P<0.05)。结论MDD患者fNIRS实验测试所见证据是背外侧前额叶皮层和额极皮层激活减弱。这一初步结果有待于进一步证实。
基金Supported by the China Meteorological Administration Special Public Welfare Research Fund(GYHY201306023)National(Key)Basic Research and Development(973)Program of China(2013CB430106)National Natural Science Foundation of China(41375051)
文摘The advance of fluid dynamics may be divided into four stages： ancient, classical, neoteric, and contem- porary. A similar four-stage framework can be used to describe the advance of synoptic meteorology, such as the conceptual models of extratropical cyclones and their attendant fronts. The first conceptual model of extratropical cyclones was proposed by Admiral FitzRoy in 1863. Based purely on Admiral FitzRoy＇s personal experience （although it does contain some scientific essentials）, this model represents the “ancient” stage of synoptic meteorology. The Norwegian cyclone model was developed based on Newtonian mechanics about 100 yr ago, and represents the classical stage of synoptic meteorology. This model was based on the idea that weather changes are primarily caused by baroclinicity, but contain some serious flaws. In particu- lar, the Norwegian model regards fronts as zeroth-order discontinuities in density, which is inconsistent with the continuity principle of fluid dynamics. The Chicago three-dimensional conceptual model of fronts and cyclones, which was developed approximately 50 yr ago by using quasi-geostrophic theory, can be thought of as representing the neoteric stage of synoptic meteorology. The Chicago model was replaced in the late 20th century by a model of extratropical cyclones characterized by back-bent and wrap-up warm fronts. This model has been developed with massive numerical calculations, and represents the contemporary stage of synoptic meteorology. In the era of large data, contemporary synoptic meteorology should be careful to maintain and make full use of the profound physical understanding generated during the neoteric stage of synoptic meteorology.
