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촉매를 사용한 ITO 나노입자 액상위험유해물질 센서의 전기적 특성 변화 고찰
조영지,안상수,노재하,이창한,허유나,장지호,이상태,박재진,이문진 한국물리학회 2023 새물리 Vol.73 No.10
A liquid sensor for hazardous and noxious substances (HNS) was fabricated using ITO nanoparticles, and the electrical characteristic changes of the sensor with catalytic application were investigated. Two types of sensors were prepared: one with an ITO film on a polyethylene terephthalate (PET) substrate (ITO/PET sub.: P-ITO) and the other with an additional 20-nm thick Au layer on top of the ITO film (Au/ITO/PET sub.: Au-ITO). The sensors were then exposed to 200-ppm diluted concentrations of ethanol (EtOH), methanol (MeOH), and isopropyl alcohol (IPA) in 3.5% saline solution, and their characteristics were compared. Compared to the ITO sensor (P-ITO), the sensor with the Au layer (Au-ITO) exhibited a significantly higher response of 29% and 21% to 200-ppm concentrations of EtOH and MeOH, respectively. The response time had also increased by a factor of 20 and 5, respectively. However, the response for IPA decreased by 0.7%, and the response time doubled. The electrical characteristics of the ITO film at different temperatures were investigated to explain these changes in response characteristics, and the results were analyzed using a hopping conduction model.
그림과 제스쳐 언어자극 제시에 따른 새로운 단어습득 비교 : 3세 아동 대상 연구
조영지,이지윤 한국언어치료학회 2019 言語治療硏究 Vol.28 No.4
Purpose: The purpose of this study was to determine the most effective non-linguistic method of support in the acquisition of novel words by young children. Two methods were tested: gestures and pictures. Methods: This study sampled 20 boys and girls aged between 35 and 45 months. They were divided randomly into gesture and picture groups. For the training words, 10 non-words having simple CVCV structure were produced based on phonemes familiar to children between the ages of 24 months and 47 months. Results: First, as a result of examining the subjects’ acquisition of receptive and expressive words, it was found that the picture group acquired 5.7 receptive words, while the gesture group acquired 7.4. As a result of examining acquisition differences between receptive and expressive words, it was found that the picture group acquired 5.7 receptive and 2.97 expressive words, while the gesture group acquired 7.4 receptive and 3.4 expressive words. Secondly, as a result of examining the differences of acquiring the novel words per group, no significant difference was found from the pre-training maintenance test; however, a significant difference was found in the novel words two weeks after the treatment. Said significance among the novel words was maintained six weeks after. Conclusions: This study examined the effects of younger children’s acquiring and maintaining words between picture and gesture groups. As No significant differences between the two methods were found immediately after the training; however, over time, it beame clear that the gesture group acquired and maintained more words. 목적 : 본 연구는 영유아를 대상으로 제스처와 그림을 제시했을 때 새로운 어휘 습득 시 두 가지의 비언어적인 지원 중 어떠한 접근이 더 효과적인지를 알아보고자 하였다. 방법 : 대상자는35~45개월의 일반남녀 아동 20명을 제스처, 그림의 2그룹으로 무작위 선정하였다. 훈련어휘는2:0~3:11개월의 숙달 연령까지의 음소를 바탕으로 CVCV의 간단한 음절 구조를 가진 10개의 비단어를 만들어 제시하였다. 결과 : 첫째, 집단 별 어휘 습득을 살펴본 결과, 집단 별 수용어휘의단어습득 차이는 그림 집단의 수용어휘 수는 5.7개이고, 제스처 집단의 수용어휘 수는 7.4개로 통계적으로 유의미한 차이가 나타나지 않았다. 집단 별 표현어휘의 단어습득 차이는 그림 집단의 표현어휘 수는 2.97개이고, 제스처 집단의 표현어휘 수는 3.4개로 집단에 따른 유의미한 차이가 나타나지 않았다. 둘째, 집단별 단어습득유지 알아본 결과, 훈련 직후에 유지검사에서 유의미한 차이가 나타나지 않았으나 2주 후, 6주 후에 이루어진 유지검사에서도 유의미한 차이가 나타났다. 논의: 본 연구에서는 영유아의 어휘습득 방법인 그림과 제스처 메커니즘 간의 새로운 단어의 습득과유지에 대해 알아보았다. 그 결과 그림과 제스처를 사용해서 새로운 단어를 습득하였을 때 직후에는 두 방법 간 유의미한 차이가 나타나지 않았지만, 시간이 경과할수록 제스처를 사용한 어휘습득이 기억유지에 도움이 되는 것으로 나타나 영유아의 어휘습득에 효과적인 방법이라는 점을 보여주었다.
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.
조영지,장지호,하준석,Hyun-jae Lee,Katsushi Fujii,Takafumi Yao,Woong Lee,Takashi Sekiguchi,Jun-Mo Yang,Jungho Yoo 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.2
Remarkable reduction of the threading dislocation (TD) density has been achieved by insertinga GaN layer grown at an intermediate temperature (900 C) (IT-GaN layer), just prior to thegrowth of GaN at 1040 C by using a hydride vapor phase epitaxy. The variation in the dislocationdensity variation along the growth direction was observed by using cathodoluminescence (CL) andtransmission electron microscopy (TEM). A cross-sectional CL image revealed that the reductionof the TD density happened during the growth of IT-GaN layer. The TEM measurement providedthe proof that the TD reduction could be ascribed to the masking of the TD by stacking faults inthe IT-GaN layer.
『위대한 신 판』 에 나타난 억압된 욕망의 귀환과 자크 라캉의 실재
조영지 한국근대영미소설학회 2024 근대 영미소설 Vol.31 No.2
Against the backdrop of late 19th century British society where the traditional concept of the human as a unitary and autonomous self had been undermined, this essay approaches Arthur Machen’s The Great God Pan in terms of the divided human subjectivity through Jacques Lacan’s theory of the symbolic subject. As Lacan states, the subject is constituted within/by society or “the symbolic order,” whereby we should forgo parts of ourselves which the symbolic prohibits such as primitive (sexual) desire. The parts of ourselves which are prohibited by the symbolic—also known as “the objet a”—belong to “the real.” This process makes us a divided subject, alienated from our own parts. In the novel, the god Pan and his descendent, Helen Vaughan, are the embodiment of parts of ourselves prohibited by the symbolic, the “objet a.” In other words, they represent the primitive or wild savage, forbidden by Victorian society, which thus evokes a feeling of horror in the symbolic subjects encountering them. The subjects, however, are paradoxically attracted toward the god Pan and Helen because they are their lost “objet a” which the subjects originally contain but forgo to become a social subject. Through the encounter with the god Pan and Helen, the social subjects realize their own monstrous self, repressed within themselves.
유수진동파 욕조에서 하는 목욕이 복부비만에 미치는 영향
조영지,최윤선,이영미,홍명호,강윤규,문유림,김우섭 대한가정의학회 2003 Korean Journal of Family Medicine Vol.24 No.11
The Effects of Vibration Baths on Abdominal Fat and Blood Lipid Profile in Obese WomenYoung Ji Cho, M.D., Youn Seon Choi, M.D., Young Mi Lee, M.D., Myung Ho Hong, Yoo Lim Moon, M.D., M.D., Yoon Kyoo Kang, M.D.*, Woo Sub Kim, M.D.*
고온가압 열처리법을 이용한 ITO의 전기적 특성 개선과 가스 센서 응용에 관한 연구
구지은,조영지,장지호,박승환,이웅,이효종,이상태 한국물리학회 2011 새물리 Vol.61 No.11
We studied the effect of pressurized high-temperature annealing of ITO films on their electrical properties and application to gas sensors. Low resistivity ITO films were achieved by using pressurized high-temperature annealing. The electrical properties were investigated by using Hall effect and four probe measurements. The resistivity of the ITO film was decreased from 11.5×10^(-4)Ω‧cm to 1×10^(4)Ω‧cm by the annealing at a high 600℃ temperature under high pressure (0.2 MPa). A thermodynamic model was applied to explain the resistivity and the carrier concentration variations. Also, an electron backscatter diffraction image was used to characterize the crystallinity of the ITO films to make it clear that those observations were not caused by improved crystal quality. The resistivity of the printed ITO powder film decreased from 1.6 KΩ‧cm to 294Ω‧cm during the pressurized annealing at high temperature. Finally, the response and the recovery properties of the printed ITO powder films were shown to depend on the properties of the ambient gases, which indicates the possibility of using printed ITO powder films for the fabrication of gas sensor devices. 고온 가압 열처리법을 이용한 분말 ITO 박막의 전기적 특성 개선과 이를이용한 가스센서의 응용 가능성에 관하여 고찰 하였다. ITO 분말을이용해 낮은 저항을 갖는 박막을 형성시키기 위하여, 압력계가 부착된챔버에 2기압 정도 가압을 하여, 600℃정도의 고온에서열처리를 진행하였다. 이렇게 제작한 시료를 4-단자법 (four-probe measurement)과 홀 측정법 (Hall measurement)을 이용하여 비저항을측정한 결과 가압 하지 않은 경우 1.5×10^(-4)Ω‧cm에서 가압 한 경우 1×10^(4)Ω‧cm로 비저항이 작아지는 전기적 특성변화를 관찰하였다. 이러한 저항변화를 ITO 박막내 케리어 농도가 Sn농도와 산소분압에의존하는 열역학 모델을 이용하여 해석하였다. 또한 Electron backscatter diffraction (EBSD) 이미지를 통해 위의 결과가 결정성과는무관한 변화임을 확인하였으며, 분말 ITO 박막에 고온가압열처리를하였을 경우 1.6 KΩ‧cm에서 294Ω‧cm로 열처리만한 경우에 비교해 82 %의 비저항 감소를 관찰하였다. 마지막으로가스센서응용을 위해 가압열처리 된 분말 ITO 박막을 인쇄공정을 통해가스센서를 제작하였고 그 특성을 관찰하였다. 실온에서 Ar, N₂,O₂의 다른 특성의 가스를 주입하였을 때, 양호한 응답 및 회복특성을관찰할 수 있어 본 연구에서 개발한 가압열처리법을 적용한 가스센서응용을 위한 가능성을 입증하였다.
산소분압제어를 통한 ITO박막의 고온열처리방법에 대한 연구
구지은,조영지,장지호,박승환,이웅,이효종,이상태 한국물리학회 2012 새물리 Vol.62 No.1
We have studied about limiting factors of the resistivity in ITO films annealed at high temperature. AFM and transmittance measurements were used to estimate the surface morphology and the transmittance of the ITO films, respectively. In addition, the electrical properties were investigated by using Hall effect and four probe measurements. The resistivity of the ITO film increased from 1.5 × 10-4Ω·cm to 6 × 10-4 Ω·cm during the annealing at high (600℃)temperature, however, it decreased from 1.5 ×10 -4Ω·cm to 1 × 10 -4Ω·cm during the annealing at high (600 ℃) temperature under Ar 0.2 MPa pressure. We confirmed by using a theoretical model that resistivity and the carrier concentration depended on both oxygen pressure and the Sn concentration. Finally, the electron backscatter diffraction image was used to characterize the crystallinity of the ITO films to make clear that those observations were not caused by an improved crystal quality. ITO 박막을 고온가압 열처리를 하였을 때의 저항변화와 그 원인에 대한고찰을 하였다. 압력계가 부착된 챔버내에 가압가스로는 Ar을 이용하여,실온에서 600 ℃까지 30분간 고온가압 열처리 하였다. 원자 힘현미경 (Atomic Force Microscopy; AFM)을 이용하여 표면 변화를확인하였으며, 투과측정을 통해 박막의 투과율을 비교하였다. 또한4-단자법(four-probe measurement)과 홀 측정법 (Hall measurement)을이용하여, 고온 열처리에서 1.5 × 10-4Ω·cm에서6 × 10-4 Ω·cm로 커지는 비저항 변화와 고온가압열처리에서 1.5 × 10-4Ω·cm에서 1 ×10-4 Ω·cm로 비저항이 작아지는 전기적 특성변화를관찰하였다. 이러한 저항변화는 ITO 박막에 도핑 된 Sn의 농도에 의한것으로, 산소 분압을 무시할 수 있는 경우 케리어 농도는 Sn의 농도에의해 박막의 농도가 결정이 되며, 산소 분압이 높을 경우 케리어 농도가감소한다는 모델을 이용하여 가압열처리를 통해 케리어 농도가 증가하고,저항이 감소하는 변화를 확인하였다. 마지막으로 이러한 변화는전자후방산란회절(Electron backscatter diffraction; EBSD) 이미지를통해 결정성과는 무관한 변화임을 확인하였다.