Abstract: To provide an electrocardiogram analysis system capable of determining the need for an electric shock to a patient undergoing cardiopulmonary resuscitation (CPR) with a higher accuracy. An electrocardiogram analysis system includes electrocardiogram (ECG) signal acquiring means 11, ECG signal sampling means 12, ECG spectrogram transforming means 13, impedance signal acquiring means 21, impedance signal sampling means 22, impedance spectrogram transforming means 23, a convolutional neural network (CNN) 4 including an input layer 4I, an output layer 4O, sample data accumulation means 4L, and sample data input means 4T, and electric shock indication reporting means 5. The CNN is a priori provided with sample data including sample ECG spectrograms and sample impedance spectrograms obtained from a large number of subjects, and sample response data on the need for an electric shock, and is optimized by self-learning the sample data.

Abstract: An example system including a plurality of terminals configured to be operated by respective users each belonging to one of a plurality of groups executes a game process involved in a game related to a virtual area in the plurality of terminals, respectively, updates area information about the virtual area for each group, based on the game process executed in the plurality of terminals, determines, for each of a plurality of periods of time, which group acquires the virtual area based on the updated area information for each group, and outputs a result of the game in which the plurality of groups compete against each other to acquire the virtual area after repeatedly performing the determining.

Abstract: An example system including a plurality of terminals configured to be operated by respective users each belonging to one of a plurality of groups executes a game process involved in a game related to a virtual area in the plurality of terminals, respectively, updates area information about the virtual area for each group, based on the game process executed in the plurality of terminals, determines, for each of a plurality of periods of time, which group acquires the virtual area based on the updated area information for each group, and outputs a result of the game in which the plurality of groups compete against each other to acquire the virtual area after repeatedly performing the determining.

Abstract: An image display device of an embodiment includes an image display means for displaying a parallax image on a display screen, a first coordinate calculating means for calculating virtual spatial coordinates of a stereoscopic image recognized by a viewer of the parallax image, a second coordinate calculating means for calculating spatial coordinates of an operating body to be operated by the viewer, and an event generating means. The event generating means generates a certain event accompanying a change of at least one of the parallax image or an image on the display screen other than the parallax image when a distance between the spatial coordinates of at least one point of the stereoscopic image calculated by the first coordinate calculating means and the spatial coordinates of at least one point of the operating body calculated by the second coordinate calculating means is equal to or less than a certain threshold.

Abstract: An image display device of an embodiment includes an image display means for displaying a parallax image on a display screen, a first coordinate calculating means for calculating virtual spatial coordinates of a stereoscopic image recognized by a viewer of the parallax image, a second coordinate calculating means for calculating spatial coordinates of an operating body to be operated by the viewer, and an event generating means. The event generating means generates a certain event accompanying a change of at least one of the parallax image or an image on the display screen other than the parallax image when a distance between the spatial coordinates of at least one point of the stereoscopic image calculated by the first coordinate calculating means and the spatial coordinates of at least one point of the operating body calculated by the second coordinate calculating means is equal to or less than a certain threshold.

Abstract: An abrasive grain for use as a grinding material comprising alpha-alumina crystal particles substantially smaller than 0.5 microns, solidly dissolved with at least one of Ti, Mn, V, Ga, Zn and Rh, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 from 4.75892 to 4.76340 angstroms when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and an abrasive grain for a grinding material, comprising alpha-alumina crystal particles substantially less than 0.5 microns, solidly dissolved with at least one of Mg, Ni and Co, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 from 4.75930 to 4.76340 .ANG. when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and further, a grinding wheel and coated cloth manufactured from these abrasive grains.

Abstract: An .alpha.-alumina-based ceramics material comprising crystals of a particle diameter of no greater than 0.2 .mu.m on an average or a particle diameter of substantially no greater than 0.2 .mu.m, and having a density of no lower than 95% of the theoretical density and a hardness of no lower than 2,000 kg/mm.sup.2, and a method for the production thereof.

Abstract: An abrasive grain for use as a grinding material characterized by alpha-corundum crystal particles substantially smaller than 0.5 micron, solidly dissolved with at least one element out of Ti, Mn, V, Ga, Zn and Rh, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 at 4.75892 to 4.76340 angstrom when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and an abrasive grain for a grinding material, characterized by alpha-corundum crystal particles substantially less than 0.5 micron, solidly dissolved with at least one element out of Mg, Ni and Co, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 at 4.75930 to 4.76340 A when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and further, a grindstone and grinding cloth manufactured that these abrasive grains.