The deposition and characteristics of Ni thin films according to annealing conditions for the application of thermal flow sensors

Sangsoo Noh,Wen-Teng Jang,Eungahn Lee,Sungil Lee 한국전기전자재료학회 2007 Transactions on Electrical and Electronic Material Vol.8 No.4

In this work, Ni thin films with different thickness from 1,523 Å to 9,827 Å were deposited for the application of micro thermal flow sensors by a magnetron sputtering and oxidized through annealing at 450 ℃ with increasing annealing time. The initial variation of resistivity decreased radically with increasing films thickness, then gradually stabilizes as the thickness increases. The resistivity of Ni thin films with 3,075 Å increased suddenly with increasing annealing time at 450 ℃, then gradually stabilizes as the thickness increases after the annealing time 9h. In case of 3,075 Å and 9,827 Å films, the average of TCR values, measured for the operating temperature range of 0℃ to 180℃, were 2,413.1 ppm/℃ and 4,438.5 ppm/℃, respectively. Because of their high resistivity and very linear TCR, Ni oxide thin films are superior to pure Ni and Pt thin films for flow and temperature sensor applications.

Characteristics of Polycrystalline β-SiC Films Deposited by LPCVD with Different Doping Concentration

Sangsoo Noh,Eungahn Lee,Xiaoan Fu,Chen Li,Mehran Mehregany 한국전기전자재료학회 2005 Transactions on Electrical and Electronic Material Vol.6 No.6

The physical and electrical properties of polycrystalline β-SiC were studied according to different nitrogen doping concentration. Nitrogen-doped SiC films were deposited by LPCVD(low pressure chemical vapor deposition) at 900 ºC and 2 torr using 100 % H2SiCl2 (35 sccm) and 5 % C2H2 in H2(180 sccm) as the Si and C precursors, and 1 % NH3 in H2(20~100 sccm) as the dopant source gas. The resistivity of SiC films decreased from 1.466 Ω×㎝ with NH3 of 20 sccm to 0.0358 Ω×㎝ with 100 sccm. The surface roughness and crystalline structure of β-SiC did not depend upon the dopant concentration. The average surface roughness for each sample 19-21 ㎚ and the average surface grain size is 165 ㎚. The peaks of SiC(111), SiC(220), SiC(311) and SiC(222) appeared in polycrystalline β-SiC films deposited on Si/SiO2 substrate in XRD(X-ray diffraction) analysis. Resistance of nitrogen-doped SiC films decreased with increasing temperature. The variation of resistance ratio is much bigger in low doping, but the linearity of temperature dependent resistance variation is better in high doping. In case of SiC films deposited with 20 sccm and 100 sccm of 1 % NH3, the average of TCR(temperature coefficient of resistance) is -3456.1 ppm/°C and -1171.5 ppm/°C, respectively.

A Study of Properties of 3C-SiC Films deposited by LPCVDwith Different Films Thickness

Sangsoo Noh,Jeonghwan Seo,Eungahn Lee 한국전기전자재료학회 2008 Transactions on Electrical and Electronic Material Vol.9 No.3

The electrical properties and microstructure of nitrogen-doped poly 3C-SiC films were studied according to different thickness. Poly 3C-SiC films were deposited by LPCVD(low pressure chemical vapor deposition) at 900 ˚C and 4 Torr using SiH₂Cl₂ (100 %, 35 sccm) and C₂H₂ (5 % in H₂, 180 sccm) as the Si and C precursors, and NH₃ (5 % in H₂, 64 sccm) as the dopant source gas. The resistivity of the 3C-SiC films with 1,530 A of thickness was 32.7 Ω-cm and decreased to 0.0129 Ω-cm at 16,963 A In XRD spectra, 3C-SiC is so highly oriented along the (1 1 1) plane at 2 θ = 35.7 ˚ that other peaks corresponding to SiC orientations are not presented. The measurement of resistance variations according to different thickness were carried out in the 25 ˚C to 350 ˚C temperature range. While the size of resistance variation decreases with increasing the films thickness, the linearity of resistance variation improved.

정보보호 관리체계 운용이 정보보호 성과에 미치는 영향

장상수(SangSoo Jang),노봉남(BongNam Noh),이상준(SangJoon Lee) 한국정보과학회 2013 정보과학회논문지 : 정보통신 Vol.40 No.1

국내?외적으로 정부나 조직은 개인정보유출, 해킹 등 각종 침해사고에 대하여 선제적으로 예방하기 위하여 기술적, 관리적, 법률적 문제를 종합적이고 체계적으로 대응 할 수 있는 다양한 정보보호 관리체계 제도를 도입?운용하고 있다. 이러한 정보보호 관리체계가 국가나 조직에서 글로벌 경쟁력의 하나로 인식되면서 정보보호에 대한 투자가 비용이 아니라 투자라는 인식과 함께 정보보호 관리체계를 도입?운용하는 등 많은 노력과 자원을 투자하고 있지만, 정보보호체계 운용이 조직의 성과에 얼마나 기여하였는지 하고 있는지에 대해서는 아직까지 명확하게 밝혀진 바가 없다. 이에 따라 본 연구는 국내 ISMS 인증 취득기업 정보보호 담당자에 대한 설문조사를 통해 ISMS 인증이 기업의 정보보호 성과에 얼마나 긍정적으로 영향을 미친다는 사실을 실증적으로 분석하여, 조직성과에 영향이 있다는 것을 입증하였으며 기업들로 하여금 ISMS 인증 취득의 효과를 인식하여 궁극적으로 ISMS 구축을 통해 보안 사고를 사전에 예방하고 기업성과를 향상시키는데 도움을 주고자 하였다. Many domestic organizations are introducing and operating various information security management systems capable of coping with technical, administrative, and legal issues comprehensively and systematically, in order to prevent various infringement incidents such as personal information disclosure and hacking preemptively and actively. However, empirical analyses regarding the extent to which an information security management system contributes to information security performance have not been fully conducted, even though enterprises and organizations are actively introducing such systems in order to achieve their information security objectives as a part of their organizational management activities in line with their respective business, by investing considerable effort and resources in developing and operating these systems. this study will substantiate the fact that development and certification of ISMS positively affect the business performance of enterprises so that they will recognize the effect of obtaining ISMS certification and eventually prevent security accidents and improve their business performance by developing ISMS.

HNS 검출용 센서의 시작품 제작 및 평가

안상수(Sangsoo Ahn),이창한(Changhan Lee),노재하(Jaeha Noh),허유나,장지호(Jiho Chang),서동민(Dongmin Seo),이문진(Moonjin Lee) 한국해양환경·에너지학회 2022 한국해양환경공학회 학술대회논문집 Vol.2022 No.6

해수 중 존재하는 유해화학물질 검출을 목적으로 센서 시작품 제작하고 성능을 확인하였다. 센서 시작품은 검지부, 기구부, 구동부로 구성하였다. 센서의 검지부는 플렉서블 기판 위에 ITO 나노입자 필름을 인쇄하여 제작하였고, 온도와 HNS 농도를 동시에 검출할 수 있도록 2개의 검출 부분을 갖도록 설계하였다. 센서의 기구부는 검지부와 구동부를 연결하며, 검출에 영향을 줄 수 있는 화학적 반응을 막기 위해 테프론 재질을 이용하여 제작하였고, 특히 검지부의 탈착이 용이하도록 하였다. 구동부는 브릿지 회로와 아두이노 보드를 이용하여 전원 공급과 데이터 측정 및 디스플레이가 가능하도록 제작하였다. 시작품의 성능은 응답 (ΔR), 검출하한 (Limit of Detection), 응답시간 (response time), 오차 (error) 등을 평가하였고, 설계 사양이 구현되었는지 확인하였으며, 실험실에서 평가한 결과와 동일한 성능이 확보되었는지 확인하였다. To detect harmful chemical substances in seawater, we fabricated a prototype sensor and evaluated its performance. The prototype sensor consisted of a detector, a housing, and a driving circuit. We made the detector by printing an ITO nanoparticle film on a flexible substrate, and it has two detection parts for temperature and HNS concentration detection simultaneously. The housing connects the detector and the driving circuit and is made of Teflon material to prevent chemical reactions that may affect sensor performance. The driving circuit supplies electric power, measure, and display data using a bridge circuit and an Arduino board. We evaluated the sensor performances such as response (ΔR), the limit of detection (LOD), response time, and the errors to confirm the specification.

왕고들빼기 ‘선향’ 수확 후 저장 온도 및 포장필름별 품질

노희선(Heesun Noh),임예나(Yena Lim),이한나(Hanna Lee),임상현(Sanghyun Lim),김희연(Heeyeon Kim),권혜정(Hyejeong Kwoon),김상수(Sangsoo Kim),최성진(Seongjin Choi),최인이(Inlee Choi),강호민(Homin Kang) 한국원예학회 2015 한국원예학회 학술발표요지 Vol.2015 No.10

Coherent Diffraction Imaging Using Focused Hard X-rays

Sunam Kim,Sangsoo Kim,Su Yong Lee,Chan Kim,Yoonhee Kim,Do Young Noh,Shashidhara Marathe,Changyong Song,Marcus Gallagher-Jones,Hyon Chol Kang 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.9

A quantitative height profile image of a silicon nano-trench structure was obtained via coherent diffraction imaging (CDI) utilizing focused X-rays at a photon energy of 5.5 keV. The ability to optimize the spatial coherence and the photon flux density of a focused X-ray beam was the key technique for achieving such technical progress at a given X-ray photon flux. This was achieved by investigating the tunability of the focused beam’s optical properties and performing a CDI experiment with the focused X-rays. The relationship between the focused X-rays’ optical properties (e.g., photon flux density and spatial coherence length) and the incident beam’s size, which can be tuned by adjusting the slits in front of the Fresnel zone plate (FZP) was elucidated. We also obtained a quantitative image of a nano-trench sample produced via the reconstruction process of CDI, which utilizes carefully tuned, focused X-rays.

Very Thin Poly-SiC Films for Micro/Nano Devices

Fu, Xiao-An,Noh, Sangsoo,Chen, Li,Mehregany, Mehran American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.6

<P>We report characterization of nitrogen-doped, very thin, low-stress polycrystalline silicon carbide (poly-SiC) films suitable for fabricating micro/nano devices. The poly-SiC films are deposited on 100 mm-diameter (100) silicon wafers in a large-scale, hot-wall, horizontal LPCVD furnace using SiH2Cl2 and C2H2 as precursors and NH3 as doping gas. The deposition temperature and pressure are fixed at 900 °C and 4 Torr, respectively. The deposition rate increases substantially in the first 50 minutes, transitioning to a limiting value thereafter. The deposited films exhibit (111)-orientated polycrystalline 3C-SiC texture. HR-TEM indicates a 1 nm to 4 nm amorphous SiC layer at the SiC/silicon interface. The residual stress and the resistivity of the films are found to be thickness dependent in the range of 100 nm to 1 <I>μ</I>m. Films with thickness less than 100 nm suffer from voids or pinholes. Films thicker than 100 nm are shown to be suitable for fabricating micro/nano devices.</P>

A Molecular Basis for the Inhibition of Transient Receptor Potential Vanilloid Type 1 by Gomisin A

Lee, Sung Bae,Noh, Shinhwa,Yeom, Hye Duck,Jo, Heejin,Eom, Sanung,Kim, Yoon Suh,Nam, Sangsoo,Bae, Hyunsu,Lee, Jun-Ho Oxford University Press 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-

<P> Transient receptor potential (TRP) channel has critical actions as conditional sensors in primary afferent neurons.We studied the regulatory action of gomisin A on TRPV1 channel current in this report. Schisandra chinensis contains bioactive compounds such as the gomisin derivatives and their related compounds. Coapplication with gomisin A inhibited the capsaicin-mediated inward peak current. This inhibitory effect of gomisin A on capsaicin-induced inward current showed concentration-dependence and was reversible. The half maximal inhibitory concentration of gomisin A was 62.7 ± 8.4 μM. In addition, this inhibition occurred in a noncompetition regulation mode and voltage insensitivemanner. Furthermore, molecular docking studies of gomisin A on TRPV1 showed that it interacted predominantly with residues at cavities in the segments 1 and 2 of each subunit. Four potential binding sites for this ligand in the extracellular region at sensor domain of TRPV1 channel were identified. Point mutagenesis studies were undertaken, and gomisin A potency decreased for both the Y453A and N467A mutants.The double mutation of Y453 and N467 significantly attenuated inhibitory effects by gomisin A. In summary, this study revealed the molecular basis for the interaction between TRPV1 and gomisin A and provides a novel potent interaction ligand. </P>

Meta- and gene set analysis of stomach cancer gene expression data.

Kim, Seon-Young,Kim, Jeong-Hwan,Lee, Heun-Sik,Noh, Seung-Moo,Song, Kyu-Sang,Cho, June-Sik,Jeong, Hyun-Yong,Kim, Woo Ho,Yeom, Young-Il,Kim, Nam-Soon,Kim, Sangsoo,Yoo, Hyang-Sook,Kim, Yong Sung Korean Society for Molecular Biology 2007 Molecules and cells Vol.24 No.2

<P>We generated gene expression data from the tissues of 50 gastric cancer patients, and applied meta-analysis and gene set analysis to this data and three other stomach cancer gene expression data sets to define the gene expression changes in gastric tumors. By meta-analysis we identified genes consistently changed in gastric carcinomas, while gene set analysis revealed consistently changed biological themes. Genes and gene sets involved in digestion, fatty acid metabolism, and ion transport were consistently down-regulated in gastric carcinomas, while those involved in cellular proliferation, cell cycle, and DNA replication were consistently up-regulated. We also found significant differences between the genes and gene sets expressed in diffuse and intestinal type gastric carcinoma. By gene set analysis of cytogenetic bands, we identified many chromosomal regions with possible gross chromosomal changes (amplifications or deletions). Similar analysis of transcription factor binding sites (TFBSs), revealed transcription factors that may have caused the observed gene expression changes in gastric carcinomas, and we confirmed the overexpression of one of these, E2F1, in many gastric carcinomas by tissue array and immunohistochemistry. We have incorporated the results of our meta- and gene set analyses into a web accessible database (http://human-genome.kribb.re.kr/stomach/).</P>