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저온분사법에 의해 제조된 Cu-Ga 타겟의 스퍼터링 특성평가
조영지,유정호,양준모,박동용,김종균,최강보,장지호,Cho, Youngji,Yoo, Jung Ho,Yang, Jun-Mo,Park, Dong-Yong,Kim, Jong-Kyun,Choi, Gang-Bo,Chang, Jiho 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.1
The microstructural properties and electrical characteristics of sputtering films deposited with a Cu-Ga target are analyzed. The Cu-Ga target is prepared using the cold spray process and shows generally uniform composition distributions, as suggested by secondary ion mass spectrometer (SIMS) data. Characteristics of the sputtered Cu-Ga films are investigated at three positions (top, center and bottom) of the Cu-Ga target by X-ray diffraction (XRD), SIMS, 4-point probe and transmission electron microscopy (TEM) analysis methods. The results show that the Cu-Ga films are composed of hexagonal and unknown phases, and they have similar distributions of composition and resistivity at the top, center, and bottom regions of the Cu-Ga target. It demonstrates that these films have uniform properties regardless of the position on the Cu-Ga target. In conclusion, the cold spray process is expected to be a useful method for preparing sputter targets.
GaN-on-Si 기술을 위한 탄화텅스텐 버퍼층의 성장에 관한 연구
조성민,최정훈,최성국,조영지,이석환,장지호,Cho, Sungmin,Choi, Junghoon,Choi, Sungkuk,Cho, Youngji,Lee, Seokhawn,Chang, Jiho 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1
Tungsten carbide (WC) has been suggested as a new buffer layer for the GaN-on-Si technology. We have investigated and optimized the sputtering condition of WC layer on the Si-substrate. We confirmed the suppression of the Si melt-back phenomenon. In addition, surface energy of WC/Si layer was measured to confirm the possibility as a buffer layer for GaN growth. We found that the surface energy(${\gamma}=82.46mJ/cm^2$) of WC layer is very similar to that of sapphire substrate(${\gamma}=82.71mJ/cm^2$). We grow GaN layer on the WC buffer by using gas-source MBE, and confirm that it is available to grow a single crystalline GaN layer.
노점상 연구에서 도시 비공식성 개념의 이론적·실천적 함의
황진태(Hwang, Jin-Tae),권규상(Kwon, Kyusang),조영지(Cho, Youngji) 한국공간환경학회 2015 공간과 사회 Vol.25 No.3
본 연구는 기존의 노점상을 바라보는 재배적 시각인 공식부문으로부터 단절된 비공식부문의 일부로 노점상을 인식하는 것을 비판하면서, 노점상을 공식부문과 비공식부문 간의 역동적인 상호관계 속에 위치시켜 바라볼 것을 제안하고자 한다. 좀 더 구체적인 연구목표는 다음과 같다. 첫째, 기존 노점상 연구에서 도시비공식성(urban informality) 개념의 필요성을 환기시킨다. 공식/비공식 부문의 이분법을 교란시키고, 비공식성이 공식경제를 비롯한 다양한 경제 형태와 공간들의 상호관계 속에 위치했음을 강조하는 도시 비공식성 개념은 정체된 노점상 연구에 있어서 의미 있는 이론적·실천적 시사점을 도출할 수 있다. 둘째, 노점상과 연결된 행위자들과 제도 그리고 이들이 위치한 구체적인 공간에 사라져야 할 정책의 대상이었고, 공간연구자들의 시각에서는 거시경제 구조의 변화에 따른 공식부문으로부터 배제의 결과로서 노점상이 발생한 것으로 인식하면서 노점상의 도시지리에서 이들을 수동적인 객체로만 인식했다. 하지만 본 연구는 노점상이 구체적인 장소 속에서 다양한 행위자, 제도들과의 역동적인 상호작용을 통해 자신들의 경관을 생산한다는 점에 주목함으로써 기존의 노점상을 바라보는 관점을 수정하고자 한다. This paper criticizes the formal-informal dichotomy in previous studies on street vending in South Korea, and proposes the concept of urban informality which emphasizes the dynamic interaction between formal and informal sectors. First, we argue that street vending research in Korea needs to take into account that informality is the result of dynamic interaction between different economies and spaces. Second, street vending should be understood in a concrete actor and space-oriented context. For policy makers, street vending is something to be ousted from the public space, whereas for researchers it is the necessary result of changes in the macroeconomic structures which have excluded vendors from the formal sector. We focus on the proactive role of street vendors in creating a landscape through the dynamic interaction between various actors and institutions in a place. This perspective can lead to a change in the way urban planners and city government officials regard street vendors as passive and marginal actors.
표면저항형 ITO 필름 센서의 표면처리 공정에 관한 연구
김동준(Dongjun Kim),안상수(Sangsu An),이창한(Changhan Lee),조영지(Youngji Cho),한민철(Mincheol Han),배찬영(Chanyoung Bae),전준수(Junsu Jeon),송유진(Yujin Song),장지호(Jiho Chang),하윤수(Yun-Su Ha),박재진(Jae-Jin Park),이문진(Moonjin Lee 한국물리학회 2024 새물리 Vol.74 No.1
A sensor that can measure the concentration of harmful chemicals in water using changes in surface resistance was fabricated using a metal oxide nanoparticle film, and the changes in sensor performance due to surface treatment processes were investigated. The influence of the surface residue of the organic binder used for film printing was focused on, and the changes in the properties of the film and sensor were observed. To remove the residual binder, a cleaning process was additionally introduced to the existing sintering process, and the changes in the properties of the ITO:CB film were observed according to the cleaning time, and the surface treatment time was optimized. It was confirmed that the sensor response improved as the cleaning time increased, and the optimal surface treatment conditions were determined to ensure good sensor operation.
ITO 나노입자 필름을 이용한 수중 금속이온 검출 센서에 대한 연구
전준수(Junsu Jeon),안상수(Sangsu An),이창한(Changhan Lee),조영지(Youngji Cho),배찬영(Chanyoung Bae),김동준(Dongjun Kim),송유진(Yujin Song),한민철(Mincheol Han),장지호(Jiho Chang),하윤수(Yunsu Ha),박재진(Jaejin Park),이문진(Moonjin Lee) 한국물리학회 2024 새물리 Vol.74 No.1
In order to use heavy metals in water for detection, a film using ITO (Indium Tin Oxide) nanoparticles was produced, and a chemoresistive sensor was produced using it to confirm the metal ion detection performance. The ITO film was produced by mixing nanoparticles and organic binders to produce paste and printing it on a PET substrate. The sensor was manufactured by forming Ag electrodes on both ends of the manufactured film, and the detection characteristics of the sensor were confirmed using five (Mn, Zn, Se, Sn, Ni) metal ion aqueous solutions. It was verified that the sensor resistance linearly increased according to the increase in the concentration of the metal ion, and that the concentration and resistance change linearly. The sensor’s performance was evaluated using the sensor’s response (ΔR), limit of detection, response time, linearity, error, and detection range.