나노 다공질 ITO전극 기반 전기화학형 발광셀 제작

정기영(Ki-Young Jung),곽동주(Dong-Joo Kwak),성열문(Youl-Moon Sung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

In this study, used simplest sandwich cells containing Ru2? liquid electrolytes in order to clarify the role of nanoporous ITO electrodes. And, the cell structure is as follow: F:SnO₂ glass/nanoporous ITO/ tris(2,2'-bipyridy)ruthenium(Ⅱ) colplex [Ru(bpy)₃(PF?)₂] in propylene carbonate/ F:SnO₂ glass. Nanoporous indium tin oxide (ITO) powder was synthesized employing a new route sol-gel combustion hybrid method using Ketjen Black as a fuel. The nano porous ITO powder was composed of SnCl4-98.0% (aqueous solution) and In (NO₃)₃ · 5H₂O-99.999% (aqueous solution), produce with a NH₄OH (aqueous solution) with sol-gel method as a catalyst. The result, we found that ECL intensities increased rapidly by use of cathodes with nanoporous ITO layers. And, porous ITO electrodes were confirmed to be efficient for ECL devices as well as solar cell devices. It is thought that the increases in the ECL intensities may be associated with both formation of Ru? in porous ITO electrodes and the process taking place after reduction of Ru? which occurs in the nanoporous electrodes.

광전기화학셀용 나노구조 산화물 박막제작에 관한 연구

정기영(Ki-Young Jung),박선희(Sun-Hee Park),곽동주(Dong-Joo Kwak),성열문(Youl-Moon Sung) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월

In this study, used simplest sandwich cells containing Ru2? liquid electrolytes in order to clarify the role of nanoporous ITO electrodes. And, the cell structure is as follow: F:SnO₂ glass/ nanoporous ITO/ tris(2,2'-bipyridy)ruthenium(Ⅱ) colplex [Ru(bpy)₃(PF?)₂] in propylene carbonate! F:SnO₂ glass. Nanoporous indium tin oxide (ITO) powder was synthesized employing a new route sol-gel combustion hybrid method using Ketjen Black as a fuel. The nano porous ITO powder was composed of SnCl₄~98.0% (aqueous solution) and In (NO₃)₃ · 5H₂O-99.999% (aqueous solution), produce with a NH₄OH (aqueous solution) with sol-gel method as a catalyst. The result, we found that ECL intensities increased rapidly by use of cathodes with nanoporous ITO layers. And, porous ITO electrodes were confirmed to be efficient for ECL devices as well as solar cell devices. It is thought that the increases in the ECL intensities may be associated with both formation of Ru? in porous ITO electrodes and the process taking place after reduction of Ru? which occurs in the nanoporous electrodes.

스텐레스 메쉬 전극을 이용한 금속전극 태양전지 제작

정기영(Ki-Young Jung),성열문(Youl-Moon Sung),곽동주(Dong-Joo Kwak),지종국(Jong-Gook Ji) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월

본 연구에서는 염료태양전지의 제작 시 고가의 TCO전극을 사용하지 않고 간단히 광전극을 대체할 수 있는 방법으로 메쉬전극을 이용하는 TCO-less 염료태양전지를 제작하였다. 메쉬전극을 이용한 염료태양전지의 구조는 “Glass / 메쉬전극(TiO₂를 딥코팅 한 후 염료를 흡착시킴) / 전해질 / 멤브레인 필터 / 상대전극(Pt-coated TCO) / Glass”로 구성된다. 제작된 샘플의 광전변환 효율은 약 1.5%였으며 fill factor는 0.55로 나타났다. 향후 계획으로 효율을 향상 시킬 수 있는 방법을 도입하여 광전류밀도와 fill factor를 개선하는 연구를 진행할 예정이다.

이동 접속망에서 마이크로 이동성을 고려한 자원예약 경로 설정 방법

정기영(Ki-Young Jung),전찬호(Chan-Ho Jun),김정준(Jung-Joon Kim) 한국통신학회 2008 한국통신학회 학술대회논문집 Vol.2008 No.7

건설업의 지식경영 영향요인이 지식경영활동 및 경영성과에 미치는 영향

정기영(Jung, Ki-Young),송영렬(Song, Young-Reol),정유수(Jung, You-Soo) 한국전산회계학회 2016 電算會計硏究 Vol.14 No.1

본 연구는 건설기업에서의 지식경영 요소에 대한 영향관계를 규명하고 건설업종의 기업들에게 지식경영의 성공적인 활용방안을 제시하기 위해 수행되었다. 건설업을 대상으로 지식경영 영향요인이 혁신행동 및 경영성과에 미치는 영향관계를 알아보고, 지식경영활동과 경영성과 간의 관계에서 혁신행동의 조절효과를 파악하였다. 연구결과 최고경영진의 관리시스템, 분권화의 정도, 정보기술 지원은 지식경영활동에 정의 영향을 미치고 있음을 발견하였다. 또한 지식경영활동은 경영성과에도 유의한 영향을 미쳤다. 이 과정에서 기업구성원들의 혁신행동 수준이 높을수록 지식경영활동이 경영성과에 미치는 영향이 강해지는 혁신행동 수준의 조절효과가 발견되었다. 본 연구를 통해 건설기업들은 조직관리시스템의 효율적 구축을 통해 구성원들의 지식경영활동에 대한 효능감의 극대화를 이끌어내어야 한다. 또한 권한의 위임을 통해 지식의 창출과 공유가 보다 활발하게 이루어질 수 있도록 하여야 한다. 정보통신 시스템의 통합을 통해 지식경영을 꾀할 수 있다. 한편 조직구성원들의 혁신행동 강화를 통해 지식경영의 성과를 극대화할 수 있도록 하여야 한다. The purpose of this study is to review the relationships among the determinants of knowledge management and its consequences, and the moderating effects of innovative behavior in the field of construction industry. The empirical results of this study are as follows. First, management system of board of directors, level of decentralization and the support of information technology(IT) have significant influence on knowledge management behavior. Second, knowledge management behavior has positive relationships with its consequences. Third, there was a moderating effect of innovative behavior in the process of knowledge management and management performances. The higher the level of innovative behavior, the more knowledge management’s consequences were influenced by the management performance.

졸겔 연소법에 의한 nano crystalline ITO제작 및 특성

정기영(Ki-Young Jung),곽동주(Dong-Joo Kwak),성열문(Youl-Moon Sung),박차수(Cha-Soo Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

Nano porous indium tin oxide (ITO) powder was synthesized employing a new route sol-gel combustion hybrid method using Ketjen Black as a fuel. The nano porous ITO powder was composed of SnCl4-98.0% and In(NO₃)₃ · XH₂O-99.999%, produce with a NH₄OH with sol-gel method as a catalyst [1,2]. Crystal structures were examined by powder X-ray diffraction (XRD), and those results show shaper intensity peak at 25.6°(2θ) of SnO₂ by increased sintering temperature. A particle morphology as well as crystal size was investigated by scanning electron microscopy (FE-SEM), and the size of the nano porous powder was found to be in the range of 20~30㎚. ITO films could controlled by nano porous powder at various sintering temperature in this paper[3,4]. The sol-gel combustion method was offered simple and effective route for the synthesis of nano porous ITO powder[5].

나노조작기 및 집속이온빔을 이용한 정밀 나노튜브 탐침의 제작

정기영(Jung Ki Young),박병천(Park Byong Chon),안상정(Ahn Sang Jung),최진호(Choi Jinho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

Precision carbon nanotube tip for atomic force microscope was fabricated where carbon nanotube orientation is controlled within the precision of 1 degree. The orientation, diameter and length of carbon nanotube tip are crucial factors for faithful profiling of surface patterns. With a nano-manipulation while viewing scanning electron microscope live image followed by focused ion beam process, precision carbon nanotube tip could be made. Precision carbon nanotube tip acts as a normal nanotube tip without Focused ion beam process. Further it maintains the elasticity. Precision tip can, in principle, enter the trench or hole less than 70 ㎚, which is impossible with the current state of the art silicon tip for critical dimension atomic force microscope.

메쉬전극을 이용한 TCO-less 염료태양전지제작

정기영(Ki-Young Jung),주인숙(In-Suk Ju),성열문(Youl-Moon Sung),곽동주(Dong-Joo Kwak),박차수(Cha-Soo Park) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.10월

CCD 카메라가 장착된 광학현미경을 사용한 폴리스티렌구 (3 ㎛와 10 ㎛)의 평균지름측정

정기영(Ki Young Jung),박병천(Byong Chon Park),강주식(Ju Sik Kang),송원영(Won Young Song),오범환(Beom-hoan O) 한국광학회 1998 한국광학회지 Vol.9 No.6

중심거리측정법은 서로 붙어있는 두 입자 중심점간의 거리를 측정하여 입자의 지름을 구하는 방법이다. 표면장력에 의해 배열이 형성된 시편 입자들의 초점군을 투과식 광학현미경에 평행 레이저광을 입사시켜 얻어내고 CCD 카메라로 영상을 받아 전산 분석하였다. Global lab image라는 영상처리 프로그램으로 초점들의 중심점을 찾고 붙어있는 입자들의 중심점간 거리를 화소(CCD 카메라의 pixel) 단위로 계산하였으며, 화소의 좌표는 레이저 간섭계로 변위를 읽는 이송대를 이용하여 교정하였다. 기존의 측정방법을 개선하여 빠른 시간에 간편하게 측정하면서도 표준입자의 배율교정에 충분한 불확도를 얻을 수 있었다. 본 실험에는 NIST 인증물질인 3 ㎛와 10 ㎛ 폴리스티렌구(NIST SRM 1962, 1960)를 측정하였으며, 1%이하의 불확도(신뢰도 99% 수준)로써 NIST 결과와 비교하였다. Center Distance Finding (CDF) is a technique to find the sphere diameter by measuring the distance between two contacting spheres. The focal spots of the sphere clusters are formed in the back-focal plane by the transmission-mode optical microscope with the pseudothermal illumination source. Digital images taken by the CCD camera were processed by the software called Global Lab Image. The centers of the focal spots are found and the spot positions are expressed in terms of the CCD pixel elements, whose coordinates are calibrated by a heterodyne interferometer. The new CDF measurement system has been developed, which are more advantageous in time and convenience than the existing system, while the measurement uncertainty remains sufficient for its use as a magnification standard for optical microscopy. Two kinds of polystyrene spheres whose nominal diameters 3 and 10 ㎛ (NIST SRM 1962 and 1960) are measured with the uncertainty less than 1% at the confidence level of 99%, and the results are compared with the results of National Institute of Standards and Technology.

MCT에서 볼 엔드밀가공으로 고능률 고정밀도 제고를 위한 절삭 조건

정기영(Ki-Young Jung) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.2

The curved surface machined by plate end mill causes a excess non-cutting volume, in these cases ball end mill is used for the curved surfaces. This study is aimed to obtain the optimum cutting condition by measuring the surface roughness on the conditions of various cutting speed, table speed, tool diameter, radius of curvature when machining the curved surface using the ball and mill. The cutting condition were the same as follow, velocity; 15, 20, 25, 30m/min, feed; 40, 60, 80, 100m/min amd radius of curvature; 30, 40, 50, 60mm, tool diameters; ∅8, ∅12, ∅16, ∅20mm. Analizing the working results, we can acquire the optimum cutting condition of curved specimen at the cutting velocity of 20∼25m/min and the feed rate of 80mm/min. As the same cutting condition, the best surface roughness was showed at ∅16mm of the tool diameter. But the tool diameter was smaller than ∅8mm, we could improve for the surface roughness by controlling the cusp.