A5101433776- Korean Urban and Social Studies
- Semiconductor materials and devices
- Microwave Engineering and Waveguides
- Advancements in Semiconductor Devices and Circuit Design
- Millimeter-Wave Propagation and Modeling
- Antenna Design and Analysis
- Diverse Topics in Contemporary Research
- Advanced Chemical Physics Studies
- Radio Frequency Integrated Circuit Design
- Antenna Design and Optimization
- Mass Spectrometry Techniques and Applications
- Ferroelectric and Negative Capacitance Devices
- Photochemistry and Electron Transfer Studies
- Ecology and Conservation Studies
- Urban and spatial planning
- Advanced SAR Imaging Techniques
- Parasites and Host Interactions
- Turfgrass Adaptation and Management
- Education, Safety, and Science Studies
- Soil Moisture and Remote Sensing
- Plasma Diagnostics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Diamond and Carbon-based Materials Research
- Microwave and Dielectric Measurement Techniques
- Metamaterials and Metasurfaces Applications
Samsung (South Korea)
2003-2024
Korea Advanced Institute of Science and Technology
1996-2021
Kyung Hee University
2013
Hanyang University
2011
This paper discusses a distributed frequency modulation continuous wave radar system. K-band system has high sensitivity, linearity, and flatness to detect low-radar cross section targets measure their range velocity. To reduce the leakage between transmitter receiver, uses not RF cables but fiber-optic links that have low distortion characteristics propagation loss. The receiver are each mounted on designed fixture ground reflections. In addition, they located different platforms signal...
This paper presents a fully digital beamforming receiver (FDBR) using method that calibrates the signals of all chains in real time, and is targeted for 5G mobile communication. In real-time calibration method, received are adjusted to correct errors phase amplitude in-band signal other than operating frequency calibration. The proposed FDBR with designed fabricated. consists eight tapered slot antenna (TSA) element, low noise block (LNB), software defined radios (SDRs). 1 × 8 array TSA...
Photodissociation of n-alkyl iodides and CF3I has been studied using state-selective ionization pulsed-field time-of-flight (TOF) mass spectrometry. The (2+1) resonance-enhanced multiphoton cross-section ratio I(2P1/2) I(2P3/2) is measured from I2 photodissociation in the 304 nm region. Using this ratio, relative populations by a pure parallel excitation to 3Q0 state are obtained. This method can exclude effects clusters spectrum overlap different dissociation paths branching calculations....
This article presents a signal generator and digital beamforming receiver (DBR) with high phase control resolution beam resolution, respectively. The is designed based on direct synthesizer (DDS) lock loop (PLL). In the DDS–PLL generator, conventional divider in PLL replaced mixer, comb doubler to utilize of DDS (14 bit, 0.022°) as it synchronize entire system. DBR, output signals generators are used second local oscillator (LO) signal, technique implemented through change LO signals. Also,...
A performance comparison of 2 × multiple-input multiple-output (MIMO) antenna arrays with different configurations and polarizations in a reverberation chamber (RC) is presented at the 28-GHz band. Eight types are proposed according to polarizations. The measured results show that they have similar respect same array size except for those concerning polarization. Based on these arrays, we propose twelve cases 2×2 MIMO dual-separated between top bottom side. channel sounder vector network...
The photodissociation of t-C4H9I has been studied at 277 and 304 nm in a supersonic molecular beam. fragments (I t-C4H9 radical) are selectively ionized by resonance-enhanced multiphoton ionization then projected onto two-dimensional position-sensitive detector to obtain their translational energy angular distributions. distribution is found consist three components: one Maxwell−Boltzmann two Gaussian Their anisotropy parameters range from 0.7 1.6 display parallel transition characteristic,...
A manufacturable 2 Gb NAND flash memory with 0.044 /spl mu/m/sup 2/ cell size, which is the smallest size ever reported in semiconductor memory, successfully developed 90 nm technology for high density file storage application. The three main key features of are advanced KrF lithography off-axis illumination system equipped a dipole aperture, reduced stack height cell, and optimized gate reoxidation affecting tunnel oxide profile.
This paper proposes high resolution digital beamforming technique using software defined radio (SDR). Digital phase shifter was designed with mixer and source calibration processing block correlation coefficient.
본 연구의 목적은 농어업유산과 경관의 관계 규명을 통하여 농어업유산의 경관특성요소를 도출하고, 이를 바탕으로 한국농어업유산 제1호로 지정받았으며, 국내에서는 처음으로 세계중요농업유산(GIAHS)에 등재된 청산도의 유형화한 후, 이에 대하여 방문객들이 중요시 여기는 인자와 만족하는 인자 간의 차이를 파악함으로써, 한국농어업유산으로 지정된 경관 보존 및 관리를 위한 우선순위를 제시하는 것이다. 위하여 규명 경관특성요소 도출을 문헌고찰, 경관특성 요소를 도출하기 현장답사, 경관특성요소에 대한 중요도-만족도 설문조사를 실시하였고, SPSS 20.0을 활용하여 신뢰도분석, 기술통계분석, IPA 분석을 실시하였으며, 그 결과는 다음과 같다. 1사분면에 분포하여 지속적 노력을 요하는 인자는 유채꽃밭, 바다, 청보리밭, 구들장논, 방파제와 등대, 전복양식장, 돌집, 초가집, 해안도로, 슬로길, 성서마을 돌담길, 주민농업행위로 분석되었다. 2사분면에 집중적 관리전략이 필요한 인자로는...
Conditioning with a diamond conditioner is routine practice in the chemical mechanical planarization process to maintain removal rate and uniformity. Electroplated Ni surfaces can be easily contaminated by polishing residues from slurry, pad, by-products during conditioning. In this study, hydrophobic film was coated onto vapor phase self assembled monolayer (V-SAM) deposition prevent contamination. The deposited vacuum chamber at 0.5 Torr 100°C using fluorocarbon (FC) precursor....
For the first time, we have successfully integrated HfSiON gate dielectric to DRAM and obtained excellent data retention time. Lower leakage current better mobility of than plasma nitrided oxide resulted in a 22% smaller propagation delay measured at CMOS inverter as well one order magnitude lower stand-by for DRAM. Optimized poly-Si reoxidation high Vt cell Tr increased time much 2 times longer oxide. We demonstrated that could enhance performance be beneficial date thermal budget same
We present a novel approach to internal calibration of radar system. A Ku-band system with paths is designed. Thermal drift mainly caused by active components, which are high-power amplifier (HPA) and low-noise (LNA). aimed reduce the using learning algorithm gradient-descent method. Hardware offset factors introduced for process. In algorithm, penalty term formed based on analysis local minimum points. The result verifies proposed Maximum deviations gain 0.0477 dB HPA 0.0132 LNA. addition,...
A transmitting planar electromagnetic (EM) lens using frequency-selective surface (FSS) for millimeter-wave (mm-wave) communication is presented. The proposed EM composed of numerous FSS unit cells on a dielectric sheet. topology each cascaded cell based sub-wavelength high-pass filters distributed over surface. design has low-profile with thickness 0.32λo and dimension 0.42λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</inf> x mm <sup...
We reduced the gate tunneling current by seven times and suppressed NBTI using plasma nitridation-induced re-oxidation (PIROX). In nitrided oxynitride, nitrogen concentration at MOS interface is determined after nitridation process, which affects electrical physical properties of oxynitride. To facilitate control interface, an additional process needed, but decreasing concentration. this paper, proposed that realizes simultaneously without decrease The amount under high pressure improves...
본 연구의 목적은 국내 노천카페의 유형을 분류하고, 평가기준을 선정하여 유형별로 평가함으로써 추후 노천카페 가이드라인을 만들 때 기초자료를 제공하는 것이다. 이를 위해 가로와의 관계성 관점에서 분류하기 위하여 가로변 전수조사가 시행되었다. 그리고 선정하기 문헌 조사와 중요도 조사가 사용되었고, 데이터의 분석에는 기술통계분석, 요인분석 등과 같은 통계방법들이 사용되었다. 그 결과, 유형은 가로돌출형, 가로개폐형, 혼합입체형, 가로앙각형, 사인제공형 등 5개 유형으로 분류되었다. 평가항목의 요인은 접근성, 심미성, 정체성, 환경성, 문화성이었는데, 이 요인의 누적기여율은 68.731%로 높은 편이었다. 이러한 평가항목을 토대로 조경 전문가 4인이 5점 리커트 방식으로 평가를 실시하였다. 유형별 평가 가로돌출형과 가로개폐형은 '심미성'과 '문화성'의 평가점수가 가장 낮았고, 혼합입체형은 낮았으며, 가로앙각형은 '접근성', '심미성', '문화성', 사인제공형은 '정체성',...
본 연구는 서울특별시에서 시행한 대학교 담장개방 녹화사업 대상 학교들을 연구 대상으로 선정하였으며, 현재까지 담장개방이 시행된 총 24개의 중 형태를 유형화하여 분류한 후, 각 유형별 대학 중, 시설이 다양하고 이용자가 많아 활성화 된 대표 사례를 선정하여 조사하여 분석하였다. 현장관찰과 문헌조사, 설문조사의 방법을 실시하여 연구하였다. 회수된 설문지는 만족도에 대한 신뢰도 분석, 이용실태에 빈도분석, 전체만족도와 공간환경 및 시설물에 회귀분석, 차이검증을 위한 One-way ANOVA를 각각 실시하였다. 이용실태 분석결과, 법제상에서의 개념인 설치위치, 이용자 특성, 이용목적 등 3가지 분석기준과 일치하는 것으로 나타났다. 시설별 전체만족도는 전원형 근린소공원 유형의 서울여자간호대학을 제외한 도시형 근린소공원의 감리교신학대학, 광장형 도심소공원의 건국대학교, 녹지형 세종대학교는 만족하고 있는 대체적으로 분수/수경시설, 체력단련시설, 광장시설에 만족하지 않는 나타나, 시...
As a photomask feature size shrinks, chrome (Cr) dry etching process is one of the most critical steps which define performance dimensions (CDs). In consequence, plasma conditions should be maintained stable in etch chamber. this work, advanced methodologies using monitoring tools are introduced; Optical Emission Spectroscopy (OES) and Self-Excited Electron Resonance (SEERS). After an chamber was monitored with these tools, could categorized respect to three parameters; spectra, electron...