Prior to this research, it was clarified that sight distance and angular distance independently affect the apparent size of objects. This research proposes a reproducing image method to determine the size of objects. The method is based on the apparent size of objects that are located in symmetrical positions in relation to the viewing point. Specifically, the effects of sight distance and angular distance on the apparent size of an object are first clarified in general terms. Then, in order to understand the precise relationship, the sight distance and angular distance between the viewing point and the objects are varied.

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  The web search strategy by the photograph and the voice are paid to attention today. And, the demand of the search strategy by the memory and the thinking will rise in the future. However, the device and the input method for them are discussed still hardly.　In this study, three basic survey researches were conducted to consider an intuitive operation. In results about the images that people want to transmit, such as the size or shape of object, the image of character and the thinking were enumerated. And, it was suggested that to transmit the size of object a gesture was more intuitive, for example. Also, it was suggested that to transmit the thinking the linguistic expression was more intuitive. For system production or device production, it is preferable to consider these results.

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  The purpose of this study is to measure the warm/cold thresholds in the oral mucosa and lips and lips neighborhood of a young fellow. By using a Thermal threshold meter attached with a new probe, thermal sensitivity of 12 oral regions（lateral upper lip, upper lip, lower lip, lateral lower lip, buccal cavity right, buccal cavity left, hard palate, soft palate, lingual tip, lingual border right, lingual middle, lingual border left） were measured in 34 young fellow（10 males and 24 females, 21.3±0.7 years）. The result showed that：（1） 0.1 ℃ / sec was more sensitive to the sensitivity than 0.3℃ / sec temperature change speed of the probe. （2） the warm/cold thresholds in the oral cavity showed no relationship to the female menstrual cycle. （3） the warm/cold thresholds in the oral cavity did not differ between males and females. （4） the 12 regions were divided in three groups by their sensitivity. The high sensitivity group（lip and lingual tip）, a middle sensitivity group（lingual and buccal catity） and a low sensitivity group（plate）.

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