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Water-Through Triboelectric Nanogenerator Based on Ti-mesh for Harvesting Liquid Flow
박홍열,김형국,황윤회,신동명 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.4
Water flow has mechanical energy as well as triboelectric energy generated by the friction between the solid surface and the water. We describe a water-through triboelectric nanogenerator (WTTENG) based on Ti-mesh that harvests electrical energy from contact electrification between the water flow and polytetrafluoroethylene (PTFE) nanowires. The electrical output from the fabricated WT-TENG is due to deionized water flowing through the polypropylene (PP) channel. The WTTENG generated a peak voltage and current of up to −9.4 V and −5.1 μA, respectively. In particular, the WT-TENG, which harvests the electrical energy from flowing deionized water, tap water and even a 0.6 M NaCl solution, can be used in applications of any existing kinds of fluids for not only harvesting mechanical energy but also sensing metal ions in the liquid.
박홍열,김기일,Park, Hong-Youl,Kim, Ki-Il 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.12
항공기용 Integrated Modular Avionics (IMA) 시스템의 경우 모듈 단위 이중화를 통하여 결함 감내 기능을 구현할 수 있다. 하지만, 이중화 구성 시 반드시 요구되는 소프트웨어 동기화는 하드웨어의 비동기적인 특성으로 인해 실제 구현 시 높은 복잡도를 야기한다. 이러한 문제점을 해결하기 위하여 현재 IMA시스템에서의 PALS(Physically Asynchronous Logically Synchronous) 디자인 패턴이 제안되었으나 실제 시스템 적용시 각 시스템의 특성에 따른 변화가 불가피하다. 본 연구는 PALS 디자인 패턴을 참조하여 Primary /Secondary 이중화를 이용하는 IMA 시스템에서의 입력데이터 동기화 설계방안을 연구하였다. 제안된 방식은 Rate Monotonic Scheduling (RMS) 방식을 고려하여 프레임 윈도우에 동기된 기법을 제안하고 있으며 시스템에 알맞은 동기화 시간을 분석하고 제안한다. 마지막으로 실험 및 분석을 통하여 제안된 방법의 타당성을 검증하였다. It is feasible to develop a fault tolerant system through module level redundancy on the Integrated Modular Avionics (IMA). However, its great implementation complexity is one of important challenges when asynchronous hardware environment is naturally assumed. To solve this problem, Physically Asynchronous Logically Synchronous (PALS) on IMA has been proposed. But, it has adaptation problem by not addressing specific architecture for IMA system. In the paper, we propose how to synchronize the input data on the IMA system under primary/secondary redundancy architecture by referring to existing PALS. In the proposed scheme, we introduce window frame by considering rate monotonic scheduling and analyze the adequate the synchronization time. Finally, we verify the feasibility of the proposed design pattern through the systematic experiments.
朴弘烈 최신의학사 1959 最新醫學 Vol.2 No.4
Recently I have treated two cases of tuberculous meningitis with usuall disturfance, and obtained good result. The disease began with severe convulsion in I)-)th cases. One patient was administered lip ramycin and the course of the db :cease was comparatively short. The a her patient was treated by Streptomycip with longer coune. The visual disturbance was seen before the administration of Streptomycin therefore it was not due to the sid effect of the drug I believe the lesson on the brain cortex or ,vas the optic verve during the Course groin the retina to be cortex. sharp contrast between these cases and those without such cernplicaiion arises interesting pro blem and I report them.
박홍열,안희상,김규정,황윤회 한국물리학회 2019 새물리 Vol.69 No.1
We studied the hydrothermal growth condition of ZnO nanostructure arrays on p-GaN substrates that could be used as light-emitting diode (LED) pixel arrays for bioimage sensors. The ZnO nanostructures were grown in the forms of either nanorods or nanoflowers at different substrate temperatures during the ZnO seed-layer deposition. We found that flower-shaped ZnO nanostructures and ZnO nanorods were grown when a rough seed layer and a smooth seed-layer were formed at temperatures lower and higher than 500 $^\circ$C, respectively. With low seed-layer growth temperatures, a rough surface was formed, provided numerous nucleation sites in patterned holes, and produced dense flower-shaped nanostructures. On the other hands, with high seed-layer growth temperatures, a smooth seed-layer surface was formed and provided nucleation sites for ZnO nanorod growth. 본 연구에서는 바이오 이미지 센서로 응용 가능한 패터닝된 p-GaN/ZnO 이종 접합 발광다이오드(light-emitting diode, LED)를 제작하기 위한 ZnO 나노구조물의 수열합성법에 있어서 성장 조건을 조사하였다. ZnO 나노구조물은 나노막대 또는 나노플라워 형태로 성장되는데, 이는 ZnO 나노구조물 성장을 위한 씨드층 증착 과정의 기판온도에 의존함을 발견하였다. 500 $^\circ$C 보다 낮은 온도에서 만들어진 씨드층은 매우 거칠게 성장하였으며, 거친 씨드층이 패턴 화 된 홀에서 많은 성장 핵 자리를 제공하여 조밀 한 꽃 모양의 ZnO 나노 구조를 생성함을 보여주었다. 그러나 500 $^\circ$C 이상의 온도에서 성장된 씨드층은 표면이 매우 균일하여 ZnO 나노막대가 정장할 수 있게 각 패턴화된 홀에 하나의 성장 핵 자리를 제공함을 알 수 있었다.
N-Phosphinothioyl carbofuran 유도체의 합성 및 살충 활성 검정
박홍열(Hong-Ryeol Park),김성문(Songmun Kim),허장현(Jang-Hyun Hur),한대성(Dae-Sung Han) 한국농약과학회 2000 농약과학회지 Vol.4 No.3
N-Dimethoxyphosphinothionyl carbofuran, PSC, has a high insecticidal activity and low mammalian toxicity. Ten N-phosphinothionyl carbofuran derivatives were synthesized and their insecticidal activities were determined against brown plant hopper (Nilaparvata lugens), green peach aphid (Myzus persicae), diamondback moth (Plutella xylostella), and two-spotted spider mite (Tetranychus urticae). Green peach aphid, diamondback moth, and brown plant hopper were controlled over 90% by application of 125 ppm, 125 ppm, and 63 ppm, respectively, of carbosulfan. Two hundred and fifty ppm of newly synthesized compounds could control most of brown plant hopper and diamondback moth. Especially, insecticidal activities of compound 10 against brown plant hopper, diamondback moth, and green peach aphid were similar to those of carbosulfan. Our results show that the newly synthesized derivatives of N-phosphinothionyl carbofuran have a similar insecticidal activity to carbosulfan.