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ABSTRACTCurrently, there are various smartwatch products on the market, and the number of users is expected to continue to increase. The functions of smartwatches have also been diversified, and the amount of information displayed on their screens is also increasing. However, as there are many restrictions on the rather small screen size, it is difficult to apply the methods used to provide information on the existing smart devices. Therefore, this study investigated how menu should be provided on the touch screen of smartwatches and derived a more effective menu structure. For our purposes, we conducted two experiments. In the first experiment, we provided 40 items in grid view and list view layout styles and tried to search for a given item by scrolling or paging. Efficiency was higher for the list view layout, in which many items were displayed on the screen and task completion time was shortened. However, the overall satisfaction was higher for the grid view layout, in which fewer items were displayed on the screen. In the second experiment, we derived an efficient menu structure when displaying hierarchical items that could be grouped into upper and lower categories. Likewise, many items on a single screen were excellent in terms of task completion time and efficiency. Providing depth of menu by categorization showed satisfactory results in task completion time, efficiency, and overall satisfaction.

Chromatin undergoes structural changes in dependence on the ionic strength of monovalent cations. At low ionic strength an extended chain of nucleosomes is apparent while with increasing ionic strength more compact structures are formed. Soluble chromatin was prepared from rat liver and fractionated by gel chromatography. Quasielastic light scattering experiments on chromatin were done with monovalent salt concentrations ranging from 3-150 mм.