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Triboelectric Nanogenerator for Collecting Particulate Matter Using Multiple Energy Sources
Hyunseo Park,Sungho Ji,Jaehee Shin,Jiyoung Yoon,Duck Hwan Kim,Jinhyoung Park 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.1
In this study, we developed a triboelectric nanogenerator (TENG)-based self-powered particulate matter (PM) collection system. Solar energy was converted into mechanical energy through a Stirling engine to obtain electrical energy using the fabricated TENG, which was operated in the free-standing mode. The fabricated TENG contained Al electrodes and polytetrafluoroethylene as a dielectric and was fabricated with a circular structure containing multiple electrodes and dielectric blades (feathers) made of poly methyl methacrylate. The power generation performance of the TENG was evaluated at different wind and blade rotational speeds. To increase the collection efficiency, a turbofan was used for air inhalation. When driven at 600 revolutions per minute (rpm), outputs of 157.5 Vpp and 4.75 µA were obtained. Finally, conductive black toner particles were used to demonstrate the Particle Matter (PM) collection feasibility of the fabricated device.
김현서(Hyunseo Kim),장재영(Jaeyoung Chang),오예림(Yelim Oh),김룡빈(Longbin Jin),신정은(Jung Eun Shin),김은이(Eun Yi Kim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Hearing loss is closely related to depression, cognitive impairment, and dementia. Therefore, early diagnosis and treatment of hearing loss can prevent these conditions. However, there has been no research on classifying hearing loss based solely on speech data. In this paper, we conducted a study on classifying hearing loss using speech data from normal individuals and those with hearing loss over the age of 50. We found that the combination of Mel-spectrogram and VGGish DNN model perform 86% accuracy in 2-class classification.
Development of High Strength Glass-ceramic using Slag for Industrial Application
Dongyoon Shin,Jin-Ho Yoon,Mijung, Yoon,Hyunseo Park,Sungmo Seo 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.05
In Korean steel making industry is generating 25 billion tons of slag as industrial by-products per year. Uses of these slags to manufacture high functional abrasive material are of greater feasible option for sustainable development of industry as well as effectively solve the pollution issue associated with these waste. Recycling methods of slag have been actively studied for decades, but most of the slag recycling methods studied are related to low cost building materials. Recently, several combinations of by-products have been used in glass-ceramic manufacturing, mostly the abrasive materials are basalt based glass-ceramic. Using these industrial by-products instead of natural basalt ores, high functional product can be manufactured. This piece of investigation focused on the feasibility study for producing the basalt based glass-ceramic from recycled industrial by-products only, without any natural materials as raw materials. By controlling various process parameters like, mixture ratios of materials, heat treatment for casting, and soaking basalt based glass-ceramic were prepared. The prepared materials were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM), thermo-gravimetry and differential thermal analysis (TG-DTA). Excellent material properties were observed.
Development of High Strength Glass-ceramic using Slag for Industrial Application
( Dongyoon Shin ),( Mijung Yoon ),( Hyunseo Park ),( Sungmo Seo ),( Jin-ho Yoon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2015 No.-
In Korean steel making industry is generating 25 billion tons of slag as industrial by-products per year. Uses of these slags to manufacture high functional abrasive material are of greater feasible option for sustainable development of industry as well as effectively solve the pollution issue associated with these waste. Recycling methods of slag have been actively studied for decades, but most of the slag recycling methods studied are related to low cost building materials. Recently, several combinations of by-products have been used in glass-ceramic manufacturing, mostly the abrasive materials are basalt based glassceramic. Using these industrial by-products instead of natural basalt ores, high functional product can be manufactured. This piece of investigation focused on the feasibility study for producing the basalt based glass-ceramic from recycled industrial by-products only, without any natural materials as raw materials. By controlling various process parameters like, mixture ratios of materials, heat treatment for casting, and soaking basalt based glass-ceramic were prepared. The prepared materials were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM), thermo-gravimetry and differential thermal analysis (TG-DTA). Excellent material properties were observed.
Long-term Renal Outcome of Biopsy-proven Acute Tubular Necrosis and Acute Interstitial Nephritis
Kim Hyunseo,조상경,Ahn Shin Young,Kwon Young Joo,이하정,오지은,Chin Ho Jun,Lim Kijoon,Lee Junyong,Yang Jihyun,Kim Myung-Gyu,Cho Won Yong,오세원 대한의학회 2020 Journal of Korean medical science Vol.35 No.26
Background: Although emerging evidence suggest acute kidney injury (AKI) progress to chronic kidney disease (CKD), long-term renal outcome of AKI still remains unclear. Acute tubular necrosis (ATN) is the most common cause of AKI due to ischemia, toxin or sepsis. Acute interstitial nephritis (AIN), caused by drugs or autoimmune diseases is also increasingly recognized as an important cause of AKI. Unlike glomerular diseases, AKI is usually diagnosed in the clinical context without kidney biopsies, and lack of histology might contribute to this uncertainty. Methods: Among 8,769 biopsy series, 253 adults who were histologically diagnosed with ATN and AIN from 1982 to 2018 at five university hospitals were included. Demographic and pathological features that are associated with the development of end stage renal disease (ESRD) were also examined. Results: Rate of non-recovery of renal function at 6 month was significantly higher in the AIN (ATN vs AIN 49.3 vs 69.4%, P = 0.007) with a 2.71-fold higher risk of non- recovery compared to ATN (95% confidence interval [CI], 1.20–6.47). During the mean follow up of 76.5 ± 91.9 months, ESRD developed in 39.4% of patients with AIN, and 21.5% patients of ATN. The risk of ESRD was significantly higher in AIN (23.05; 95% CI, 2.42–219.53) and also in ATN (12.14; 95% CI, 1.19–24.24) compared to control with non-specific pathology. Older age, female gender, renal function at the time of biopsy and at 6 months, proteinuria and pathological features including interstitial inflammation and fibrosis, tubulitis, vascular lesion were significantly associated with progression to ESRD. Conclusion: Our study demonstrated that patients with biopsy proven ATN and AIN are at high risk of developing ESRD. AIN showed higher rate of non-renal recovery at 6 month than ATN.
Proxy MIPv6에서 패킷의 순서 어긋남을 해결할 수 있는 Flush 메시지 기반의 경로 최적화 메커니즘
이창민(Changmin Lee),이범재(Beomjae Lee),이재훈(Jaehwoon Lee),박현서(Hyunseo Park),신경철(Gyungchul Shin) 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.3
Proxy MIPv6(PMIPv6)는 이동 노드를 대신하여 액세스 망에서 노드의 이동성을 지원하기 위한 네트워크-기반 이동성 관리프로토콜이다. 기존의 PMIPv6 프로토콜에서는 이동 노드가 통신하고자 하는 상대 노드가 동일한 PMIPv6 도메인에 있는 또 다른 이동 노드인 경우에는, 두 이동 노드 간에는 최적화되지 않은 경로를 따라서 패킷이 교환되는 문제가 발생한다. 이를 해결하기 위하여 PMIPv6 기반 망에서의 경로 최적화 기법이 제안되었다. 그렇지만, 이 기법에서는 송신측에서 전송한 패킷이 순서에 어긋나게 수신측에 도착하여 응용 계층에서의 성능 저하 문제가 발생한다. 이 논문에서는 PMIPv6 프로토콜에서 패킷의 순서 어긋남 문제를 해결할 수 있는 flush 기반의 경로 최적화 메커니즘을 제안한다. 제안된 메커니즘의 성능을 모의실험을 통하여 분석하였으며, 제안된 방법이 기존의 PMIPv6 기반의 경로 최적화보다 우수한 성능을 제공함을 알 수 있었다. Proxy MIPv6 (PMIPv6) is that network-based mobility management protocol that network supports mobile node's mobility on behalf of the MN. In PMIPv6, when two MNs located within the same PMIPv6 domain want to communicate each other, sub-optimal path is established between the two MN. Route optimization method for PMIPv6 is proposed to resolve the problem. However, the method still suffer from the performance degradation due to out-of-sequence packet problem. In this paper, we propose the route optimization mechanism in PMIPv6 based on Flush message to resolve the out-of-sequence packet problem. The proposed mechanism is evaluated by performing simulations, and the simulation results show that the proposed one gives better performance.