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박운익(Park woon-Ik),이규봉(Lee kyu-bong),김세윤(Kim se-yoon),박길흠(Park kil-houm) 한국정보과학회 2008 정보과학회 컴퓨팅의 실제 논문지 Vol.14 No.6
TFT-LCD영상은 불균일한 휘도 변화를 어느정도 허용하고 있으며, 영상 전반에 걸쳐 나타나는 큰 휘도변화는 국부적으로 주변 영역과 차이가 나는 결함 영역을 찾는데 방해가 된다. SQI(Self Quotient Image)는 얼굴 인식 분야에서 저주파에 해당하는 조명성분을 제거 하는데 사용되어 왔으며, 일종의 High Pass Filter(고주파 통과 필터)형태이다. 본 논문에서는 SQI가 신호의 저주파 성분을 평활화 하는 효과를 가지면서 국부적인 변화를 유지하는 특성을 가지는데 착안하여, TFT-LCD영상에 존재하는 결함을 강조하는 알고리즘을 제안 하였다. 제안한 방법을 기존의 TFT-LCD영상 전처리 방법들과 비교하였을 때, 평활화 효과 및 결함 영역 강조 효과가 우수함을 확인할 수 있었다. The TFT-LCD image allows non-uniform illumination variation and that is one of main difficulties of finding defect region. The SQI (self quotient image) has the HPF (high pass filter) shape and is used to reduce low frequency-lightness component. In this paper, we proposed the TFT-LCD defect-enhancement algorithm using characteristics of the SQI, that is the SQI has low-frequency flattening effect and maintains local variation. The proposed method has superior flattening effect and defect-enhancement effect compared with previous the TFT-LCD image preprocessing.
고정렬 Pt 라인 및 크로스-바 미세패턴의 구조적 안정성 연구
박태완,박운익,Park, Tae Wan,Park, Woon Ik 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
This study discusses and demonstrates the structural stability of highly ordered Pt patterns formed on a transparent and flexible substrate through the process of nanotransfer printing (nTP). Bending tests comprising approximately 1,000 cycles were conducted for observing Pt line patterns with a width of $1{\mu}m$ formed along the direction of the horizontal (x-axis) and vertical (y-axis) axes ($15mm{\times}15mm$); and adhesion tests were performed with an ultrasonicator for a period greater than ten minutes, to analyze the Pt crossbar patterns. The durability of both types of patterns was systematically analyzed by employing various microscopes. The results show that the Pt line and Pt crossbar patterns obtained through nTP are structurally stable and do not exhibit any cracks, breaks, or damages. These results corroborate that nTP is a promising nanotechnology that can be applied to flexible electronic devices. Furthermore, the multiple patterns obtained through nTP can improve the working performance of flexible devices by providing excellent structural stability.
스피커 응용을 위한 적층형 압전 세라믹 액츄에이터 제조 및 특성
이민선,윤지선,박운익,홍연우,백종후,조정호,박용호,정영훈,Lee, Min-seon,Yun, Ji-sun,Park, Woon Ik,Hong, Youn-Woo,Paik, Jong Hoo,Cho, Jeong Ho,Park, Yong-Ho,Jeong, Young-Hun 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.10
Piezoelectric thick films of soft $Pb(Zr,Ti)O_3$ (PZT) based commercial material (S55) were fabricated using a conventional tape casting method. Ag-Pd electrodes were printed on the piezoelectric film at room temperature and all 5 layered films with a dimension of $12mm{\times}16mm$ were successfully laminated for a multi-layered piezoelectric ceramic actuator. The laminated specimens were co-fired at $1,100^{\circ}C$ for 1 h. A flat layered and dense microstructure was obtained for the $112{\mu}m$ thick piezoelectric actuator after sintering process. Thereafter, a prototype piezoelectric speaker was fabricated using the multi-layered piezoelectric ceramic actuator which can operate as a bimorph. Its SPL (sound pressure level) characteristic was also evaluated for speaker application. Frequency response revealed that the output SPL with a root mean square voltage of 10 V increased gradually to the highest peak of 87.5 dB for 1.5 kHz and exhibited a relatively stable behavior over the measured frequency range (${\leq}20kHz$) at a distance of 10 cm, implying that the fabricated piezoelectric speaker is potential for speaker applications.
가로등 제어용 다층패드형 압전 하베스터의 개발 및 평가
김창일,정영훈,박운익,조정호,장용호,최범진,박신서,백종후,Kim, Chang-Il,Jeong, Young-Hun,Park, Woon Ik,Cho, Jeong-Ho,Jang, Yong-Ho,Choi, Beom-Jin,Park, Shin-Seo,Paik, Jong-Hoo 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.11
In this study, to increase output of road piezoelectric energy harvester, it was made into rack type in which many piezoelectric materials can be installed and load transfer device of the leverage type to transfer vehicle load was made. By paving it in the road, the output characteristics depending on vehicle load and speed were evaluated. Changing vehicle load, harvester output characteristics depending on speed changes were evaluated at the interval of 10 km/h from 10 km/h to 100 km/h. Also, by making a wireless switch and sending wireless signal with output of rack type harvester, whether to receive it was evaluated by distance. It was checked that all switches work up to front-to-back 100 m from harvester.
Hard PZT IDE 유니몰프 캔틸레버의 압전 에너지 하베스팅 특성
이민선,김창일,윤지선,박운익,홍연우,조정호,백종후,박용호,장용호,최범진,정영훈,Lee, Min-seon,Kim, Chang-il,Yun, Ji-sun,Park, Woon-ik,Hong, Youn-woo,Cho, Jeong-ho,Paik, Jong-hoo,Park, Yong-ho,Jang, Yong-ho,Choi, Beom-jin,Jeong, Young-hu 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.8
A unimorph piezoelectric cantilever generator with an interdigitated electrode (IDE) was developed for vibration energy harvester applications driven in the longitudinal mode. Hard lead zirconate titanate (PZT) ceramic with a high $Q_m$ of 1,280 was used as the piezoelectric active material. Ten PZT sheets produced by tape casting were laminated and co-fired with an Ag/Pd IDE at $1,050^{\circ}C$ for 2 h. The approximately $280{\mu}m$-thick co-fired PZT laminate with the IDE was attached to a stainless steel substrate with an adhesive epoxy for the fabrication of an IDE unimorph cantilever. Its energy harvesting characteristics were evaluated: an output power of $1.1{\mu}W$ at 120 Hz across the resistive load of $700k{\Omega}$ was obtained, corresponding to a normalized power factor of $4.1{\mu}W/(G^2{\cdot}cm^3)$.
허연혁 ( Yeon Hyuk Heo ),박운익 ( Woon Ik Park ),황정숙 ( Jung Suk Whang ),박종욱 ( Chong Ook Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.1
Reference electrode is an important tool in many electrochemical field. But insufficiency in the performance of commercial Ag/AgCl reference electrodes have been demonstrated in applying to long-time operating devices. To improve the performance of Ag/AgCl electrode, we used electrochemical method using controlling voltage in forming AgCl on Ag. And then heat treatment, polymer coating, and structure change improved the characteristic and long term stability of reference electrode. This fabricated reference electrode realized credible measurement in variety electrolytes.
미세 구조 변화에 따른 ZnS 세라믹의 중적외선 투과 특성 연구
박창순,여서영,권태형,박운익,윤지선,정영훈,홍연우,조정호,백종후,Park, Chang-Sun,Yeo, Seo-Yeong,Kwon, Tae-Hyeong,Park, Woon-ik,Yun, Ji-Sun,Jeong, Young-Hun,Hong, Youn-Woo,Cho, Jeong-Ho,Paik, Jong-Hoo 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.11
Transparent ZnS ceramics were synthesized by hydrothermal synthesis ($180^{\circ}C$ for 70 h), and were sintered by a hot press process at $950^{\circ}C$. To confirm the optical properties of the ZnS ceramics after sintering for various sintering holding times, we performed X-ray diffraction analysis, scanning electron microscopy, and Fourier-transform-infrared spectroscopy. The ZnS nanopowders was found to be single-phase (cubic) without any hexagonal phase. However, the hexagonal phase is formed and increases in content with increasing sintering holding time. The density of the ZnS ceramics was above 99.7%, except for the unsintered one. The ZnS ceramics showed high transmittance (~70%) when sintered for more than 2 h.
인쇄전자 기술을 활용한 지능형 반도체 소자 구현을 위한 유기전계효과 트랜지스터 소자의 광파 어닐링 효과 연구
권미정 ( Mi Jeong Kwon ),박운익 ( Woon Ik Park ),임영수 ( Young Soo Lim ),남수용 ( Suyong Nam ),백강준 ( Kang-jun Baeg ) 한국화상학회 2020 한국화상학회지 Vol.26 No.3
Here we study new post-treatment methods of polymeric semiconductors for the applications of printed and flexible electronics. In contrast to the conventional thermal process using a hotplate, our lightwave-assisted annealing could provide an efficient and fast way both for enhancing the molecular packing order and increasing the crystallinity of organic semiconductor thin-films through the transfer of thermal energy efficiently into the inside of the active layer. After light-wave annealing process, OFETs exhibited higher field-effect mobilities and consistent performance with a little standard deviation of electronic fundamental parameters in comparison to those of the hotplate treatment. Therefore, it is expected to be widely applied for mass productive and large area printed and flexible applications.
스핀 스프레이 법으로 제조한 망가나이트 박막의 전기적 특성
전창준,정영훈,윤지선,박운익,백종후,홍연우,조정호,Jeon, Chang Jun,Jeong, Young Hun,Yun, Ji Sun,Park, Woon Ik,Paik, Jong Hoo,Hong, Youn Woo,Cho, Jeong Ho 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
Effects of pH value and deposition time on the electrical properties of (NMC) Ni-Mn-Cu-O and (NMCC) Ni-Mn-Cu-Co-O thin films were investigated. The NMC and NMCC films were prepared by spin spray method. The crystal structure and thickness of the annealed films were changed by the pH value and deposition time, respectively. A single phase of cubic spinel structure was confirmed for the annealed films deposited from solutions with pH 7.6. The resistivity of the annealed films was affected by the crystal structure and microstructure. The TCR (temperature coefficient of resistance) was dependent on the $Mn^{3+}/Mn^{4+}$. Typically, the resistivity of $70.5{\Omega}{\cdot}cm$ and TCR of -3.56%/K at room temperature were obtained for NMCC films deposited from solutions with pH 7.6 for 5 min, and annealed at $450^{\circ}C$ for 3 h.
박태완,정현성,방지원,박운익,Park, Tae Wan,Jung, Hyunsung,Bang, Jiwon,Park, Woon Ik 한국표면공학회 2018 한국표면공학회지 Vol.51 No.6
Nanopatterning is one of the essential nanotechnologies to fabricate electronic and energy nanodevices. Therefore, many research group members made a lot of efforts to develop simple and useful nanopatterning methods to obtain highly ordered nanostructures with functionality. In this study, in order to achieve pattern formation of three-dimensional (3D) hierarchical nanostructures, we introduce a simple and useful patterning method (nano-transfer printing (n-TP) process) consisting of various linewidths for diverse materials. Pt and $WO_3$ hybrid line structures were successfully stacked on a flexible polyimide substrate as a multi-layered hybrid 3D pattern of Pt/WO3/Pt with line-widths of $1{\mu}m$, $1{\mu}m$ and 250 nm, respectively. This simple approach suggests how to fabricate multiscale hybrid nanostructures composed of multiple materials. In addition, functional hybrid nanostructures can be expected to be applicable to various next-generation electronic devices, such as nonvolatile memories and energy harvesters.