전자빔 조사가 ZnO 박막의 전기적 특성 변화에 미치는 영향

최준혁,조인환,김찬중,전병혁,Choi, Jun Hyuk,Cho, In Hwan,Kim, Chan-Joong,Jun, Byung-Hyuk 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.1

The effect of low temperature ($250^{\circ}C$) heat treatment after electron irradiation (irradiation time = 30, 180, 300s) on the chemical bonding and electrical properties of ZnO thin films prepared using a sol-gel process were examined. XPS (X-ray photoelectron spectroscopy) analysis showed that the electron beam irradiation decreased the concentration of M-O bonding and increased the OH bonding. As a result of the electron beam irradiation, the carrier concentration of ZnO films increased. The on/off ratio was maintained at ${\sim}10^5$ and the $V_{TH}$ values shifted negatively from 11 to 1 V. As the irradiation time increased from 0 to 300s, the calculated S. S. (subthreshold swing) of ZnO TFTs increased from 1.03 to 3.69 V/decade. These values are superior when compared the sample heat-treated at $400^{\circ}C$ representing on/off ratio of ${\sim}10^2$ and S. S. value of 10.40 V/decade.

Nanosilver particles-based conductive patterns developed by direct soft imprint lithography

최준혁,S.W. Lee,K.D. Kim,D.G. Choi,J.H. Jeong,E.S. Lee 한국물리학회 2009 Current Applied Physics Vol.9 No.11

For the direct patterning of electronic device structures, the present work explored an idea of using UV imprint based on nanosilver particles-dispersed UV (ultraviolet) curable resin. In current work, asreceived Ag solution was applied to HEMA (hydroxyethyl methacrylate) as an ultraviolet (UV) curable precursor with the addition of photoinitiator (~3 wt%) to formulate electrically conductive resin mixtures with the Ag contents of 40–60 wt%. The UV exposed imprinted patterns with PDMS (polydimethylsiloxane) stamp become electrically conductive after properly optimized heat treatment. Those are, then, wetetched to remove imprint residue, which lead to the formation of the isolated current transfer media. This imprint scheme can contribute to substantially reduced process steps and corresponding costs associated with additional metal processes.

Cr³⁺ 또는 Selenium 첨가 배양액으로 재배한 치커리의 항산화활성 및 α-glucosidase저해효과

최준혁,박윤희,이성규,이소희,유미희,이무상,박순화,이인선,김현정,Choi, Jun-Hyeok,Park, Yun-Hee,Lee, Sung-Gyu,Lee, So-Hee,Yu, Mi-Hee,Lee, Mu-Sang,Park, Sun-Hwa,Lee, In-Seon,Kim, Hyun-Jeong 한국식품위생안전성학회 2014 한국식품위생안전성학회지 Vol.29 No.1

$Cr^{3+}$ 및 Se을 첨가하여 수경 재배한 치커리 3종의 에탄올 추출물을 각각 제조하여 추출물별 항산화 활성을 비교 검토하였다. 그 결과 양액만으로 재배한 치커리보다 양액에 Se이나 $Cr^{3+}$을 첨가한 치커리 추출물에서 총 폴리페놀 함량, 총 플라보노이드 함량 및 FRAP 환원능이 증가하였으며, DPPH 라디칼 소거능 및 ABTS 라디칼 소거능도 증가하였다. 특히 Se을 첨가한 치커리보다 $Cr^{3+}$을 첨가한 치커리에서 더 우수한 항산화 활성을 나타내었다. 또한 $Cr^{3+}$을 첨가한 CLER 및 CLE의 경우 ${\alpha}$-glucosidase 저해활성이 있음을 알 수 있었다. 따라서 치커리 추출물의 수경재배 과정에서 양액에 $Cr^{3+}$, Se의 첨가는 치커리의 항산화 활성 및 ${\alpha}$-glucosidase 저해활성 증진에 영향을 주는 것으로 확인되었다. This study was carried out to investigate the effect on the growth and antioxidant activities of Cichorium intybus L.(CLE), Cichorium intybus L. var. folisum 'treviso' (CLET), Cichorium intybus L. var. folisum 'rosaitaliana' (CLER) in hydroponics added with $Cr^{3+}$ or Selenium (Se) for 4 weeks. Total polyphenol, total flavonoids contents and FRAP values of three species of chicory were grown hydroponically with $Cr^{3+}$ or Se were increased. These extracts were also showed stronger DPPH and ABTS scavenging activity than chicory extracts. In particular, chicories added with $Cr^{3+}$ had higher antioxidant activities than chicories added with Se. CLER and CLE extracts added with $Cr^{3+}$ were also showed ${\alpha}$-glucosidase inhibition activities. These results indicate that chicories were cultivated in culture fluid added with $Cr^{3+}$ or Se could be used as high functional vegetables.

인체사료의 처분에 관한 법률문제 - 독일의 논어를 중심으로 -

최준혁,Choi, Jun-Hyouk 대한의료법학회 2007 의료법학 Vol.8 No.1

Hier zu behandelndes Thema ist ein altes Problem beim Recht, das seinen Ursprung sogar im romischen Recht finden kann. Aber wegen der medizinischen und naturwissenschaftlichen Entwicklung $t\ddot{a}ucht$ es wieder mit anderen Konstellationen auf. Dabei geht es besonders darum, ob sich die Patienten an der kommerziellen Nutzung seiner $K\ddot{o}rpersubstanzen$ von anderen-z. B. $\ddot{A}rzten$ oder Forschern-beteiligen $k\ddot{o}nnen$. $Daf\ddot{u}r$ gibt es in Bezug auf Gesetz keine besonderen Regelungen in Deutschland. Und nach zivilrechtlicher Theorie stellt Nutzung menschlicher $K\ddot{o}rpersubstanzen$ eine Personlichkeitsverletzung des fruheren $Tr\ddot{a}gers$ und/oder eine Verletzung des Arzt-Patienten-Vertrages dar. $Au{\beta}erdem$ ist Anspruch des $fr\ddot{u}heren\;Tr\ddot{a}gers$ debkbar, der auf dessen Einwilligung basiert. Dabei sind diese Probleme $zun\ddot{a}chst$ unter $Pers\ddot{o}nlichkeitsverletzung$ zu subsumieren und damit zu $l\ddot{o}sen$.

동면종의 압착도말 세포소견 -1예 보고-

최준혁,신덕섭,Choi, Joon-Hyuk,Shin, Duk-Seop The Korean Society for Cytopathology 2008 대한세포병리학회지 Vol.19 No.2

Hibernoma is a rare, benign adipose tumor composed of brown fat cells with eosinophilic granular or multivacuolated cytoplasm. The cytologic features of hibernoma have been rarely reported and may mimic other polygonal cell neoplasms. We report the imprint cytologic features of a case of hibernoma in the left thigh of a 68-year-old woman. Microscopic examination showed large, round, or polygonal brown fat cells. The cells were arranged in fragments or clusters. The nuclei were uniformly round with finely granular chrornatin. The cytoplasm was multivacuolated or univacuolated. The abundant eosinophilic granular cytoplasm was also present. No nuclear atypia were present. Immunohistochemical staining showed that cells were positive for S-100 protein.

내진 모사하중에 의한 스테인레스강 와이어 보강 교각의 응답

최준혁,김성훈,이도형,Choi, Jun Hyeok,Kim, Sung Hoon,Lee, Do Hyung 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.4

In the present study, a new seismic retrofitting method that employs both a stainless steel wire mesh and a permeable polymer concrete mortar was proposed for reinforced concrete bridge piers with nonseismic design details. For this purpose, a total of six nonseismically designed bridge piers were tested under lateral load reversals. The test results reveal that nonseismically designed piers with lap splices need to be retrofitted to resist earthquake induced forces. In addition, it was proven that the proposed retrofitting method can be useful in improving the strength, stiffness, and energy dissipation capacities of bridge piers designed nonseismically. It is thus expected that the proposed method may provide an improved ductility capacity without sudden softening of strength for bridge piers excursing inelastic displacement range. 본 연구에서는, 비내진 설계된 철근콘크리트 교각에 대해 스테인레스강 와이어 메쉬와 고강도 침투성 폴리머 몰탈을 사용한 내진보강 기법을 제안하였다. 본 연구의 목적을 위해, 총 6본의 비내진 설계된 교각 실험체에 대해 반복 가력 실험을 수행하였다. 실험결과, 주철근 겹이음을 갖는 비내진 설계된 교각 실험체에 대한 내진보강이 필요하다는 것을 알 수 있었고, 본 연구에서 제안된 보강 기법은, 비내진 설계된 교각의 강도, 강성 및 에너지 소산능력에 증진 효과가 있음을 알 수 있었다. 또한, 제안된 보강 기법은 비탄성 변위 영역을 경험하는 교각의 강도 저감 완화와 함께 연성도 증진에도 효과가 있을 것으로 기대된다.

방위력개선사업비 편성.확보의 합리성과 안정성 제고방안 -국방중기계획 연부액의 편성 및 확보방안을 중심으로-

최준혁,이필중,Choi, Joon-Hyouck,Lee, Pil-Jung 한국국방경영분석학회 2008 한국국방경영분석학회지 Vol.34 No.1

현재 세계 각국은 탈냉전 이후 격변하는 안보환경 속에서 생존을 위한 다양한 도전에 직면해 있다. 이에 한국군도 '국방개혁 2020'을 통한 첨단 정보과학군으로의 변모를 죄하고 있으며, 이는 필연적으로 새로운 군사력 소요를 창출하게 되었다. 그리고 이와 같은 군사력 건설의 성공적인 추진을 위해 방위산업 및 국방예산의 중요성은 더욱 증대되었다. 하지만 현재 한국의 방위산업은 심각한 어려움을 겪고 있으며, 더욱이 방위력개선사업비의 낮은 합리성 안정성은 이러한 실태를 더욱 악화시켜 왔다. 이와 같은 상황에서 한국 방위산업의 발전과 한국군 군사력 소요의 적기 충족을 위해서는 방위력개선사업비의 합리성 안정성 제고방안 강구가 시급하다. 따라서 본 연구의 목적은 한국 방위력개선사업 비의 합리성 안정성 제고를 위한, 방위력개선사업분야 국방중기계획의 연부액 편성체계 개선 및 국가재정운용계획과 국방중기계획의 연계 강화방안을 제시하는 데 있다. 한국 국방목표의 성공적 달성을 위해 국방중기계획의 연부액 편성체계 개선을 통해 방위력개선사업비의 합리성을 제고하고 안정성 제고를 위해 이를 국가재정운용계획과 연계시켜 최근 국가재정법 발효 등으로 변화가 불가피한 한국의 국방예산 편성체계에서 방위력개선사업비의 시기적절한 변화를 도모하고자 한다. The ROK's military is attempting to change to advanced information science force through 'the Defense Reform 2020', which essentially creates the requirements of new military force. Therefore, the importance of defense industry and defense budget have been emphasized in order to successfully promote military build-up. However, the ROK defence industry has been going serious difficulties in the present day, and what is worse, unreliable rationality stability of Defense Capability Improvement Cost put the industry in the harder situation. In this circumstances, the improvement measures of the rationality stability of Defense Capability Improvement Cost should be immediately studied to satisfy the requirements of ROK military force in a suitable time and the development of ROK defense industry. The purpose of this study was to propose reinforcement measures to improve the arrangement system of yearly allocation for Mid-term Defense Plan of defense capability improvement programs and connect Mid-term Defense Plan to National Fiscal Management Plan to raise the rationality stability of ROK Defense Capability Improvement Cost.

A Diffusion-based Model Theory of Passive-Targeted Drug Delivery in Solid Tumors

최준혁,강남룡,최상돈,Choi, Joon-Hyuck,Kang, Nam-Lyong,Choi, Sang-Don Korean Society of Medical Physics 2007 의학물리 Vol.18 No.3

A model theory of passive-targeted drug delivery in sphere-shaped solid tumors is introduced on the basis of Fick's law of diffusion, with appropriate boundary and initial conditions. For a uniform initial concentration inside the tumor, the concentration is obtained as a function of time and radial position. The concentration is shown to approach the equilibrium distribution as the time elapses, as is expected by the Gedanken Experiment. The time-evolution rate is found to be determined by the diffusion coefficient of the drug in the tissue, the size of the tumor, the volume of the drug-injected region, and the concentration gradient at the boundary. 공모양의 단단한 종양안에서 수동조준된 약물의 전달에 관한 모델이론이 적절한 경계조건과 초기조건하에서 픽의 확산법칙으로부터 유도된다. 종양안의 농도는 초기값이 일정하면 시간과 지름의 함수로 나타난다. 생각실험(사고실험)으로부터 예측되는 바와 같이, 농도는 시간이 경과함에 따라 평형값에 접근한다. 시간에 따른 농도의 변화는 조직안의 약물의 확산계수, 종양의 크기, 주입된 약물의 양, 경계면에서의 농도의 물매(gradient)에 의해 결정된다.

콘크리트 슬래브 궤도 교량의 사용성 검토를 위한 레일 지지점에서의 작용력 해석

최준혁,Choi, Jun-Hyeok 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4

본 연구에서는 콘크리트 슬래브 궤도를 가지는 교량의 사용성 검토에 있어 단위 축하중, 단위 수직 단차, 단위 회전에 의해 발생되는 레일 지지점의 작용력에 대한 기준 값을 구하였다. 해석방법에 있어서는 레일이 탄성 스프링에 의해 연속적으로 지지되는 모델과 이산적으로 지지되는 모델이 이용되었다. 해석결과 얻어진 레일 지지점에서의 작용력은 콘크리트 궤도의 사용성 검토에서 참조되고 있는 DS 804 기준에 제시된 값과 비교되였으며, 그 결과는 잘 일치하였다. 또한, 레일 지지점의 간격과 체결장치의 강성이 레일 지지점에서의 작용력에 미치는 영향을 분석하였다. In this study, the reference values for the internal forces of the rail supports caused by a wheel load, a unit vertical displacement, a unit end rotation in examination of the serviceability of concrete slab track bridge were obtained. In analysis, the analysis models of which the rail was continuously and discretely supported by elastic springs were used. The internal forces of the rail supports from the analysis were compared with the results provided in the DS 804 regulations and agreed with well. In addition, the effects of the space between the rail supports and the stiffness of fastener on the internal forces of the rail supports were investigated.

측정된 기상 조건 데이터를 이용한 지상물체의 표면온도 특성 연구

최준혁,박태원,김태국,Choi, Jun-Hyuk,Park, Tae-Won,Kim, Tae-Kuk 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3

This paper is a part of developing a program that predicts the surface temperature and the IR images of ground objects by considering solar irradiation and atmospheric convection. The thermal modeling is essential for identifying objects on the scenes obtained from the remote sensing. And the temperature distribution on the objects is necessary to obtain their infrared images in contrast to the background. We considered the composite heat transfer modes including conduction, convection and spectral solar radiation incident on the objects within a scene to calculate the surface temperature distribution. The surface temperatures obtained by using the S/W developed in this study(Silhouette) and a commercial S/W(SE-Workbench-IR) are computed and compared each other. Results obtained by using the S/W developed in this study(Silhouette) show fairly good agreement with those obtained by the SE-Workbench-IR.