With the advent of artificial intelligence and the Internet of Things, demand has grown for flexible, low‐power, high‐density nonvolatile memory capable of handling vast amounts of information. Ultrathin‐layered 2D semiconductor materials such as molybdenum disulfide (MoS2) have considerable potential for flexible electronic device applications because of their unique physical properties. However, development of flexible MoS2‐based flash memory is challenging, as there is a lack of flexible dielectric materials with sufficient insulating properties for use in flash memory devices with dielectric bilayers. Here, large‐scale, low‐power nonvolatile memory is realized based on a chemical vapor deposition (CVD)‐grown millimeter‐scale few‐layer MoS2 semiconductor channel and polymer dielectrics prepared via an initiated CVD (iCVD) process. Using the outstanding insulating properties and solvent‐free nature of iCVD, fabricated memory devices with a tunable memory window, a high on/off ratio (≈106), low operating voltages (≈13 V), stable retention times exceeding 105 s with a possible extrapolated duration of years, and cycling endurance exceeding 1500 cycles are demonstrated. Owing to these characteristics, these devices distinctly outperform previously reported MoS2‐based memory devices. Leveraging the inherent mechanical flexibility of both ultrathin polymer dielectrics and MoS2, this work is a step toward realization of large‐scale, low‐power, flexible MoS2‐based flash memory.
Background: To evaluate the patterns of distribution and clinical manifestations of ocular injuries referred to the level 1 trauma center of Pusan National University Hospital (PNUH) in Korea. Methods: We analyzed 254 of 4,287 patients who were referred to the Department of Ophthalmology at the level 1 trauma center of the PNUH, from January 2016 through December 2018. Data on the incidence of ocular injuries, sex, age, monthly and seasonal distribution, day and time of injury, side of injury, cause, residence of patients, referral time to an ophthalmologist and subsequent examination time, final visual acuity (VA), and complications were obtained from medical records and retrospectively reviewed. The patients were grouped according to their main diagnosis using the Birmingham Eye Trauma Terminology System (BETTS) and Ocular Trauma Score (OTS). Results: The incidence of ocular injuries with major trauma was higher in men (n = 207, 81.5%), the median age at time of injury was 54 years, and Pusan recorded the most cases.
PurposeTo investigate the efficacy of fortified barrier laser (FBL) on the vitreous base in vitrectomy for rhegmatogenous retinal detachment (RRD).Patients and methodsThis was a retrospective study of patients who underwent vitrectomy for RRD without proliferative vitreoretinopathy. Barrier laser was applied as 3–4 rows surrounding the break at the end of fluid-air exchange. For the FBL, 3–4 rows of laser burn were additionally made about 0.5 clock-hour long adjacent to the break along the posterior border of the vitreous base. The primary outcome was single surgery success rate (SSSR) between two groups: FBL and conventional barrier laser (CBL) groups.ResultsOverall, 118 eyes were included; 50 eyes in the FBL group and 68 eyes in the CBL group. SSSR was 100% (50/50) in the FBL group and 91.2% (62/68) in the CBL group with a significant difference (p=0.038). Four eyes of the recurrent cases in the CBL group were related to reopening of the break. All eyes achieved reattachment, and no differences were found in postoperative visual acuity at 6 months.ConclusionFBL on the vitreous base was efficacious in improving the anatomical success rate of vitrectomy.
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