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윤현식,남기웅,박형길,손정식,임재영 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
ZnO nanorods were grown on spin-coated ZnO seed layers by the hydrothermal method. The Mg0.2Zn0.8O capping layers were deposited on ZnO nanorods by the sol-gel method. The ZnO nanorods with Mg0.2Zn0.8O capping layers were annealed at 600°C. Temperature-dependent photoluminescence (PL) spectroscopy was carried out to investigate the mechanism governing the quenching behavior of the PL spectra. For the 12 K PL spectra, the peaks of the Mg0.2Zn0.8O capping layers, excitons bound to neutral donors (D0X), two-electron satellite transitions, donor-acceptor pairs, and free-to-neutral-acceptors and their longitudinal optical (LO)phonon replicas were observed at annealing temperatures from 600°C. At 12 K, the peak of the Mg0.2Zn0.8O capping layers was blue-shifted as the annealing temperature increased. The peaks of the D0X, free excitons and Mg0.2Zn0.8O capping layers merged and the PL intensity of the peaks decreased while the temperature increased from 12 to 300 K.
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윤현식 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2
Rapid progress in research and development of wireless networking and communication technologies has created different type of wireless system. These systems are envisioned to coordinate with each other to provide ubiquitous high data-rate services to mobile users. In this thesis a new architecture, Architecture for Ubiquitous Mobile Communications(AUMC), is introduced that integrates these heterogeneous wireless systems. AUMC eliminates the need for direct service level agreements among service providers by using a third party, a network interoperating agent. Instead of developing a totally new infrastructure, AUMC extends the existing infrastructure to integrate heterogeneous wireless systems. It uses If as the interconnection protocol. By using IP as the gluing protocol, transparency to the heterogeneities of the individual systems is achieved in AUMC. New mobility management protocols are also developed to support seamless roaming between different wireless systems.
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머신러닝을 활용한 커피전문점 입지선정 예측 연구 : 커피빈 사례를 중심으로
윤현식,심진영 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.11
커피의 수요가 증가하는 만큼 커피전문점의 수도 꾸준히 증가하고 있다. 하지만 창업 후 3년 내에 폐업하는 커피전문점의 수가 크게 증가하면서 전체 폐업매장의 절반 이상이 영업기간 3년을 채우지 못하고 폐업하고 있다. 커피전문점 중 3년 이상 영업 중인 업체는 어떠한 특성을 가진 상권에 입점하는가에 대한 연구를 해보고자 한다. '커피빈코리아’를 대상으로 서울특별시 내 모든 매장 중 영업기간이 3년 이상인 점포의 주소 정보를 수집하고, 매장에서 반경 300m 이내 상권 특성을 파악한다. 머신러닝을 활용하여 ‘커피빈’이 입점하는 상권의 특성 및 중요 요인을 분석한다. 더불어 현재 매장이 없는 지역 중 상권의 특성상 점포 개점 가능성이 있는 장소를 예측하고자 한다.
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尹賢植 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2
In this paper, the arithemtic circuit design method of sigmoid function generator in order to reducing the chip size and high speed of processing, using MRC (Mixed-Radix Conversion) As a result of computer simulation,proposed algorithm has been identified a simple circuit and high speed processing in comparison with using general floating -point processor
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만성 뇌졸중 환자 재활에서 고유수용성 진동 훈련과 기존 훈련 효과 비교
윤현식 한국신경근육물리치료학회(구 한국신경근육재활학회) 2025 한국신경근육재활학회지 Vol.15 No.1
Stroke is a leading cause of long-term disability globally, characterized by impairments in motor and sensory functions and limitations in activities of daily living (ADL). Proprioceptive vibration training (PVT) has recently gained attention as a promising rehabilitation approach to activate proprioceptive systems and improve motor function. This study evaluated the effects of proprioceptive vibration training (PVT) on lower limb motor function and activities of daily living (ADL) in chronic stroke patients. This retrospective study involved 28 chronic stroke patients who were divided into a CPT group (n=14) and a PVT group (n=14). Both groups underwent five 30-minute sessions per week for four weeks. The PVT intervention utilized a vibration platform set at 20 Hz, with exercises focusing on lower limb strengthening, weight-bearing on the affected limb, and balance training. Outcomes were assessed using the Fugl-Meyer Assessment for Lower Extremity (FMA-LE) and the Modified Barthel Index (MBI). Statistical analyses were conducted to evaluate pre- and post-intervention differences and intergroup comparisons. PVT significantly improved Fugl-Meyer Assessment-Lower Extremity (FMA-LE) scores (+26.09%) and Modified Barthel Index (MBI) scores (+33.39%) compared to CPT. A moderate positive correlation between lower limb function and ADL (r = 0.60, p < 0.01) was observed. PVT enhances proprioceptive stimulation, increases muscle activation, and reduces spinal excitability, improving neuromuscular control. These results support PVT as an effective and stable neurorehabilitation method, providing superior outcomes in lower limb function and ADL performance compared to conventional physical therapy.
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AFTL: Hot Data 검출기를 이용한 적응형 플래시 전환 계층
윤현식,주영도,이동호 한국정보과학회 2008 정보과학회논문지 : 시스템 및 이론 Vol.35 No.1
NAND Flash memory has been growing popular storage device for the last years because of its low power consumption, fast access speed, shock resistance and light weight properties. However, it has the distinct characteristics such as erase-before-write architecture, asymmetric read/write/erase speed, and the limitation on the number of erasure per block. Due to these limitations, various Flash Translation Layers (FTLs) have been proposed to effectively use NAND flash memory. The systems that adopted the conventional FTL may result in severe performance degradation by the hot data which are frequently requested data for overwrite in the same logical address. In this paper, we propose a novel FTL algorithm called Adaptive Flash Translation Layer (AFTL) which uses sector mapping method for hot data and log-based block mapping method for cold data. Our system removes the redundant write operations and the erase operations by the separating hot data from cold data. Moreover, the read performance is enhanced according to sector translation that tends to use a few read operations. A series of experiments was organized to inspect the performance of the proposed method, and they show very impressive results. 최근 NAND 플래시 메모리는 빠른 접근속도, 저 전력 소모, 높은 내구성, 작은 부피, 가벼운 무게 등으로 차세대 대용량 저장 매체로 각광 받고 있다. 그러나 이런 플래시 메모리는 데이타를 기록하기 전에 기존의 데이타 영역이 지워져 있어야 한다는 제약이 있으며, 비대칭적인 읽기, 쓰기, 삭제 연산의 처리속도, 각 블록당 최대 소거 횟수 제한과 같은 특징들을 지닌다. 위와 같은 단점을 극복하고 NAND플래시 메모리를 효율적으로 사용하기 위하여, 다양한 플래시 전환 계층 제안되어 왔다. 그러나 기존의 플래시 전환 계층들은 Hot data라 불리는 빈번히 접근되는 데이타에 의해서 잦은 겹쳐쓰기 요구가 발생되며, 이는 급격한 성능 저하를 가져 온다. 본 논문에서는 Hot data 검출기를 이용하여, 매우 적은 양의 데이타인 Hot data를 검출한 후, 검출된 Hot data는 섹터사상 기법을 적용시키고, 나머지 데이타인 Cold data는 로그 기반 블록 사상 기법을 적용시키는 적응형 플래시 전환 계층(AFTL)을 제안한다. AFTL은 불필요한 삭제, 쓰기, 읽기 연산을 최소화시켰으며, 기존의 플래시 전환 계층과의 비교 측정을 통하여 성능의 우수성을 보인다.
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