We report flexible resistive random access memory (ReRAM) arrays fabricated by using NiO /GaN microdisk arrays on graphene films. The ReRAM device was created from discrete GaN microdisk arrays grown on graphene films produced by chemical vapor deposition, followed by deposition of NiO thin layers and Au metal contacts. The microdisk ReRAM arrays were transferred to flexible plastic substrates by a simple lift-off technique. The electrical and memory characteristics of the ReRAM devices were investigated under bending conditions. Resistive switching characteristics, including cumulative probability, endurance, and retention, were measured. After 1000 bending repetitions, no significant change in the device characteristics was observed. The flexible ReRAM devices, constructed by using only inorganic materials, operated reliably at temperatures as high as 180 °C.
People generally communicate with their voices. At this time, information transmission through the language becomes the main function of the voice. In addition to the verbal elements of the voice, various information can be conveyed. It can convey about 100 kinds of information such as the face expression, emotion, health, confidence, stress of the speaker. The voices of people are basically different for each individual, and analyzing them can provide additional elements in addition to basic linguistic features. Especially, it can be obtained by analyzing the relationship between the characteristics on the fundamental frequency(basic tonality) of the vocal cords, and the characteristics of resonance frequency of the vocal track. Today, people are trying to communicate their intent clearly to others, and that can be analyzed the
ICT sector has been made a great deal of achievements for past 20 or more years in the aspects of the industrial promotion and the efficiency improvement under the strong leadership by the government for the informatization and still leads the Korean industries. However, the previous studies are mostly on how the quantitative growth of patents impacts a company's management achievements while being insufficient on the qualitative level. In this study, an analysis is attempted on the impact from the qualitative level of patents held by a ICT company leading Korean industry to its management achievements. In other words, if the concentration of technological innovation activities, a scale to measure the qualitative level of possessed patents is influential to the growth and the profit of a company is analyzed. The analysis result shows that the current time technological superiority index, RTA and the concentration index, CRn of the technological innovation activities significantly impact to the growth and the profit of company. This study demonstrates the positive impact from a highly qualitative level of patents to the growth and the profit of a company in ICT sector in the current circumstance of insufficient researches on the qualitative level of patents. Therefore, this study is expected to present a new start point for the future studies.■ keyword :|ICT|intellectual property|Patent|tchnological Innovation|RTA|CRn|Management Achievement|
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