A5019031132- Acoustic Wave Phenomena Research
- Vehicle Noise and Vibration Control
- Advanced MEMS and NEMS Technologies
- Climate Change Policy and Economics
- Energy, Environment, Economic Growth
- Environmental Impact and Sustainability
- CCD and CMOS Imaging Sensors
- Noise Effects and Management
- Sensor Technology and Measurement Systems
- Multilevel Inverters and Converters
- Advanced DC-DC Converters
- Advanced Sensor and Energy Harvesting Materials
- Adhesion, Friction, and Surface Interactions
- Diverse Topics in Contemporary Research
- Advanced Sensor Technologies Research
- Aerodynamics and Fluid Dynamics Research
- Fiscal Policy and Economic Growth
- demographic modeling and climate adaptation
- Image Processing Techniques and Applications
- Aerodynamics and Acoustics in Jet Flows
- Engineering Applied Research
- Iterative Learning Control Systems
- Integrated Circuits and Semiconductor Failure Analysis
- Consumer Perception and Purchasing Behavior
- Microgrid Control and Optimization
Daewoo Shipbuilding and Marine Engineering (South Korea)
2022
Konkuk University
2003-2020
Hanyang University
2002-2018
Konkuk University Medical Center
2012-2017
Samsung (South Korea)
2001-2017
Anyang University
2016
Yonsei University
2002
Abstract Ink‐jet printed metal nanoparticle films have been shown to anneal at high temperatures (above 500 °C) highly conductive on glass or ceramic substrates, but they suffer from cracking and inadequate substrate adhesion. Here, we report printable materials, with added nanosized frit that can be annealed °C form a crack‐free dense microstructure adheres well substrates. This overcomes the previous challenges while still retaining desired film conductivity. Controlling particle...
China is one of the world’s major environmental polluters, therefore, Chinese efficiency an issue global importance. In this study, we aim to identify economic factors affecting scores in different regions from a spatial econometric perspective. We measure scores, relative theoretically consistent production possibilities frontier estimated, according novel iterative methodology. As expected, find that are negatively affected by prevalence heavy industry sector economy, with higher share...
Sound radiation from electric motor‐driven vehicles is negligibly small compared to sound internal combustion engine automobiles. When running on a local road, an artificial required as warning signal for the safety of pedestrians. In this study, was synthesized by combining mechanical and sounds. The sounds were made summing harmonic components representing rotating cranks. components, including not only magnitude but also phase due frequency, obtained numerical integration method. noise...
The relationship between grain size and domain distributions has been studied by piezoelectric force microscopy in ferroelectric films with average of 150nm. As the ratio to increases, deviation decreases a 1∕xn-type function, where n is 1.105. Extrapolation model shows that order obtain 10% 1Tbit∕in.2 media, smaller than 14nm required. obtained results imply either nanograin or single crystalline/epitaxial provide reliable for probe storage applications.
We present a CMOS image sensor (CIS) with phase detection auto-focus (PDAF) in all pixels. The size of photodiode (PD) is 0.64μm by 1.28μm, the smallest ever reported and two PDs compose single pixel. Inter PD isolation was fabricated deep trench (DTI) process order to obtain an accurate AF performance. layout depth DTI optimized eliminate side effects maximize performance even at extremely low light condition up 1lux. In particular remains comparable that 0.70μm dual CIS. By using our...
This paper presents a two-dimensional heat-exhaust and sound-proof acoustic meta-structure exhibiting tunable multi-band negative effective mass density. The was composed of periodic funnel-shaped units in square lattice. Each unit cell operates simultaneously as Helmholtz resonator (HR) an extended pipe chamber (EPCR), leading to density creating bandgaps for incident sound energy dissipation without transmission. structure allowed large heat-flow through the cross-sectional area since...
Very fast, precise and robust servo algorithm tracking for a probe storage system are proposed, which use only probes without any additional high-resolution position sensors. Servo uses the values read by as coordinate of every data bit with one-to-one correspondence so that it provides high accuracy, short seek-time, robustness. Also concept virtual subsection field is introduced to reduce number probes. Tracking can detect two-axis errors used off-track control synchronization...
We present a cost-benefit analysis of coastal protection via seawalls in South Korea against climate-change-induced sea level rise. This is the first bottom-up for Korea, deriving optimal solution from extensive geographical and financial databases with detailed street-address-level information. Our indicates that net benefit maximized if are built along 21% Korean coast. By comparing to aggregate utilizing comprehensive sensitivity analysis, we highlight two implications climate change...
A new two-axis positional error detection algorithm for probe storage is proposed. Using only probes, this can detect positions simultaneously and continuously off-track control synchronization. Two decomposition signals are multiplied to the readback signal while vibrating scanner in low frequency of specific value extract two position from it. In addition, same using one Because provides very precise errors continuously, synchronization be controlled zero sensitivities disturbances reduced
본 연구는 FUND모형을 이용하여 우리나라의 제주도를 대상으로 해수면 상승에 따른 경제적 피해 비용 및 최적 해안 방어 비율을 도출하였다. 대부분의 기존 연구들은 기후변화에 상승의 이를 방어하기 위한 분석하기 연구 대상을 전 세계나 대륙 중심으로 분석하여 개별 국가의 대응 정책에 활용하기에는 한계가 있다. 따라서 연구에서는 우리나라를 시도로 우리나라에 적용하기 지표 값들을 도출하고 토대로 분석하였다. 2100년까지의 분석기간 동안 시나리오별로 범람 면적은 약 2.01%~2.25%이고 토지 가치로는 6.4%~7.2%로 상대적으로 높아 지역이 경제활동이 활발한 지역임을 보였다. 추정된 보면 제주시가 87.16%~87.92%로 서귀포시 73.32%~75.47%보다 높다. 비록 제주시의 해안선의 길이가 서귀포시에 비하여 더 길어 비용이 필요하지만 규모가 크기 때문에 가치가 큼을 보여주었다. This study estimates the economic impact of...
The noise generated by internal combustion engine is reduced passive muffling systems. For the system, its performance significantly degrades especially when multiple low frequency tonal components exist in flow. occur from explosion process of engine, and radiates as a monopole outlet. In this study, active cancelation using FxLMS algorithm proposed to reduce exhaust noise. Air-horn which capable being operated at high temperatures for radiated vibration input diaphragm air-horn allowed...
하구역 생태계의 지속가능성을 평가하기 위해서 최근에는 구동·압력·상태·영향·반응(DPSIR) 모형에 바탕한 지표체계가 자주 사용된다. 그러나 담고 있는 정보를 보다 간결하게 표현하기 위해서는 이러한 지표체계를 단일 지수로 전환하는 것이 필요하다. 본 연구에서는 몇 가지 방법들을 고찰하였다. 특히 DPSIR 모형에서는 구동 및 압력 지표가 상태 영향 지표에 중요한 결정요인임을 가정하고 있으므로, 이를 바탕으로 대한 예측모형을 구성하는 가능하고, 이 모형으로부터 조기경보시그널에 해당하는 지수를 추출할 수 방안을 제시하였다. 그리고 지수 전환 실제 데이터에 적용할 때 생기는 이슈들을 검토하기 위해 한국의 주요 중 하나인 금강하구역에 적용하여 조기경보지수를 분석하였다.
A control scheme of a three-phase voltage-source PWM power converter available for the condition different input voltages is proposed in this paper. From steady-state model converter, effect caused by voltage on current analyzed from point linear controllability current. Sufficient level DC link to linearly then analytically determined. The with fixed-gain controller and simple but effective online gain tuning algorithm obtain optimal regulation voltage. In conclusion, validity proved...
본 연구에서는 기후변화에 따른 해수면 상승이 우리나라 동해안 및 남해안 일대에 미치는 경제적 영향과 이를 방어하기 위한 최적 해안 방어비율을 광역시 도별로 분석하였다. 위하여 FUND(The Climate Framework for Uncertainty, Negotiation and Distribution) 모형에 우리나라에 적합한 지표들을 적용하여 해당 도의 면적 대비 예상 범람 지역 비율을 분석한 결과를 보면 지리적 차이가 있어 부산광역시는 시나리오에 따라 3.19% 내외로 상대적으로 높은 비율로 추정되었으나 강원도는 0.1% 낮게 추정되었다. 피해비용도 경제활동이 활발한 부산광역시, 울산광역시 경상남도에서의 피해비용은 매우 높게 나타났다. 그러나 방어비율 추정 해안선의 길이가 짧고 피해비용이 큰 부산광역시와 울산 광역시는 각각 98% 내외, 92% 추정되었고 피해 규모는 크나 방어비용 또한 추정된 경상남도에서는 최적해안 방어비율이 78%~79%로 이에 반하여 강원도의...