Chung-Ang University

About: Chung-Ang University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Population & Thin film. The organization has 13381 authors who have published 26978 publications receiving 416735 citations. The organization is also known as: CAU & Chung.

Enhanced Endurance Organolead Halide Perovskite Resistive Switching Memories Operable under an Extremely Low Bending Radius

Abstract: It was demonstrated that organolead halide perovskites (OHPs) show a resistive switching behavior with an ultralow electric field of a few kilovolts per centimeter. However, a slow switching time and relatively short endurance remain major obstacles for the realization of the next-generation memory. Here, we report a performance-enhanced OHP resistive switching device. To fabricate topologically and electronically improved OHP thin films, we added hydroiodic acid solution (for an additive) in the precursor solution of the OHP. With drastically improved morphology such as small grain size, low peak-to-valley depth, and precise thickness, the OHP thin films showed an excellent performance as insulating layers in Ag/CH3NH3PbI3/Pt cells, with an endurance of over 103 cycles, a high on/off ratio of 106, and an operation speed of 640 μs and without electroforming. We suggest plausible resistive switching and conduction mechanisms with current–voltage characteristics measured at various temperatures and with dif...

Internet addiction and interpersonal problems in korean adolescents.

Abstract: The purpose of this study was to examine the levels of Internet addiction and interpersonal problems, explore the relationship between the two, and identify the relevant factors of Internet addiction in Korean middle school students. A cross-sectional survey design was used. The participants were 676 middle school students. A Korean version of the Internet addiction self-test scale and a Korean version of the Inventory of Interpersonal Problems were used. Among the participants, 547 (80.9%) were identified as general users, 108 (16%) were potential risk users, and 21 (3.1%) were high-risk users. There were statistically significant positive correlations between Internet addiction and interpersonal problems (r = 0.425, P = .000). There were significant positive correlations between Internet addiction and hours spent playing games. Internet-addicted adolescents also had more interpersonal problems. It is important to raise awareness about Internet addiction, and close attention must be paid not only to students at risk of Internet addiction but also to students at low risk to prevent students from becoming addicted to the Internet.