FTS법을 이용한 ITO박막의 제작

김건희,금민종,김한기,손인환,장경욱,이원재,최형욱,박용서,김경환,Kim, Geon-Hi,Keum, Min-Jong,Kim, Han-Ki,Son, In-Hwan,Jang, Kyung-Wook,Lee, Won-Jae,Choi, Hyung-Wook,Park, Yong-Seo,Kim, Kyung-Hwan 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11

The ITO thin films were prepared by the FTS(Facing Targets Sputtering) system. The ITO thin films are deposited by changing the input current and working gas pressure. Then, electric characteristics, transmittance and surface roughness of ITO thin films were measured by Hall effect measurement, UV-VIS spectrometer and AFM. As a result, the ITO thin film was fabricated with resistivity 6xl0$^{-4}$ Ωㆍcm, carrier mobility 52.11 $\textrm{cm}^2$/Vㆍsec, carrier concentration 1.72 x $10^{20}$ $cm^{-3}$ transmittance over 85 % of ITO film at working gas pressure 1 mTorr and input current 0.6 A.

천체관측용 적외선 광학계 초정밀 가공

김건희,진호,양순철,김명상,국명호,이성호,육인수,Kim, Geon-Hee,Jin, Ho,Yang, Sun-Chol,Kim, Myung-Sang,Kook, Myung-Ho,Lee, Sung-Ho,Yuk, In-Soo 한국천문학회 2007 天文學論叢 Vol.22 No.3

The KASINICS (Korea Astronomy and Space science Institute Near Infrared Camera System) is a ground-based near-infrared (NIR) imaging instrument. KASINICS has offner relay optics to reduce unwanted infrared light. For the offner optics, we adopted an ultra precision machining process which is installed at KBSI (Korea Basics Science research Institute). Since the offner relay optics is made of aluminum 6061 metal material, we did several tests to reach the specification. We found that a 0.497mm radius nose bite and 220m/min machining speed are best tool and condition to make this offner optics with the precision machine. In this paper, we report the technical method of ultra precision machining and results of the KASINICS offner optics.

뽕나무(Morus alba)와 꾸지뽕나무(Cudrania tricuspidata)의 부위에 따른 항산화 활성 및 3T3-L1세포 지방축적 억제 효과

김건희,김은향,Kim, Gun-Hee,Kim, Eunhyang 한국식품영양학회 2019 韓國食品營養學會誌 Vol.32 No.2

In this study, we examined antioxidative effects and the anti-adipogenesis effect of different parts of Cudrania tricuspidata (C), and Morus alba (M). Total polyphenol contents were highest in M-root ($34.56{\pm}0.045mg\;GAE/g$), and there was no significant difference, between C-root and M-leaf. Total flavonoid contents of C-root were highest ($23.07{\pm}0.004mg\;QE/g$). To examine antioxidant activities of C and M extracts, DPPH and ABTS radical scavenging activity, and FRAP assay, was used. Results show that antioxidant activities of C and M extracts increased, in a dose-dependent manner. Adipocytes are generated by preadipocyte differentiation, during adipogenesis. Matured adipocytes accumulate in abnormal and cause obesity. We investigated effects of leaf and root extracts of C and M, on lipid accumulation, in 3T3-L1 adipocytes. Changes in cell morphology, and degrees of lipid accumulation in adipocytes, were evaluated by Oil Red O staining. Root extracts of C and M, reduced lipid content in a dose-dependent manner. Therefore, root extracts of C and M, may be good candidates for managing obesity.

초정밀 가공장비 기술동향과 한국기초과학지원연구원의 연구.개발현황

김건희,Kim, Geon-Hui 한국광학기기산업협회 2007 光學世界 Vol.107 No.-

초정밀 가공기술은 선진국에서 기술이전을 회피하는 가장 심한 분야로 광산업의 핵심부품인 반사경, 비구면 렌즈, 광통신매체의 가공과 관련하여 국내의 초정밀 관련 기술의 한계에 의하여 전적으로 수입에 의존하고 있다. 이에 한국기초과학지원연구원은 2005년부터 기존의 측정분석위주의 단순지원에서 국가적 수요에 대응하는 대형첨단연구장비의 국산화를 위한 기술개발에 역점을 두고 있다. 이를 위한 기반기술로써 초정밀 가공 및 측정장비의 설치운영을 통한 첨단 연구장비의 핵심부품을 개발하고 있다. 특히 천문관측용 적외선(IR) 광학계의 초정밀가공기술 개발을 통한 항공우주용 광학계의 국산화 기술 향상에 기여하고 있다.

간호교육에서의 전문직 간 교육에 대한 현황과 발전방향

김건희,황은희,신수진,Kim, Kon Hee,Hwang, Eunhee,Shin, Sujin 연세대학교 의과대학 2017 의학교육논단 Vol.19 No.1

This study examined the perception and readiness of nursing educators regarding interprofessional education (IPE), and discussed the validity and application of IPE in nursing. From December 2016 to January 2017, 239 nursing professors and nurses completed a structured questionnaire consisting of general characteristics, the Interdisciplinary Education Perception Scale, the Readiness for Interprofessional Learning Survey (RIPLS), and an IPE action plan. The collected data were analyzed by descriptive statistics and t-test using the IBM SPSS ver. 23.0 program (IBM Corp., Armonk, NY, USA). The analysis revealed that 91.6% of the participants had not experienced IPE, and only 11.7% knew about IPE. However, approximately 80.0% answered that IPE is necessary. The results of this study showed that the score of the perceived need for cooperation was higher in nurses than it was in professors, while the score on competency and autonomy was higher in professors than it was in nurses. With reference to the scores on the RIPLS, those of professors were high on the sub-scales of teamwork and collaboration, professional identity, and roles and responsibility. The results revealed that participants considered the upper-grade undergraduate years as the ideal time for imparting IPE, and it was deemed suitable to include communication, simulation, and clinical practice in IPE. Doctors, pharmacists, and physiotherapists were thought to require cooperation for IPE the most. Despite the presence of several barriers to IPE, the participants thought that IPE can achieve learning outcomes such as interprofessional communication and cooperation, conflict resolution, and teamwork. It is necessary to cooperate with professionals in the complex clinical environment as professional areas are specialized and subdivided. Therefore, it is necessary to examine the application of IPE in undergraduate education and in on-the-job training.

간호학과 인증평가에 따른 간호교육의 질 향상 및 질 확보 노력에 대한 교수 인식

김건희,Kim, Kon Hee 연세대학교 의과대학 2011 의학교육논단 Vol.13 No.2

This study investigated faculty perceptions of the improvement and effort for achievement of the quality of nursing education through accreditation in baccalaureate nursing programs in 2006. Survey data from 190 professors of 33 accredited nursing schools were statistically analyzed using SPSS ver. 19.0 software with descriptive statistics, t-tests, and ANOVA. Through accreditation, about two-thirds of subjects perceived that the quality of education had 'improved' and the purposes of the accreditation were moderately successfully achieved (score 3.50). They also perceived their schools made a strong attempt (score 4.24) to assure quality. The perception scores of efforts to assure the quality of education varied significantly according to the characteristics of the subjects, the existence of a university hospital, the type of college, and the year of school founding. There were significant differences between the level of improvement in education and the extent of effort to assure the quality of education. Accreditation contributed to improved quality of nursing education except for some issues which need more consideration. To maintain high quality, the accreditation of baccalaureate nursing programs should be performed with continuity and on a regular basis.

부처손(Selaginella tamariscina) 추출물의 리파아제 저해 활성 및 지질 축적 억제 효과

김건희,이신영,이애랑,Kim, Gun-Hee,Lee, Shin-Young,Lee, Ae-Rang 한국식품영양학회 2019 韓國食品營養學會誌 Vol.32 No.1

The objective of this study was to evaluate novel usability as natural anti-obesity supplement of Selaginella tamariscina extract. The total phenol contents and total flavonoid contents were $60.29{\pm}3.11GAE\;mg/g$ and $14.90{\pm}0.34QE\;mg/g$, respectively. To evaluate anti-obesity activity of Selaginella tamariscina extract, pancreatic lipase inhibition activity as well as its inhibition effect of lipid accumulation in adipocytes were conducted by Oil Red O staining and lipolysis assay. The result of pancreatic lipase inhibition activity of S. tamariscina extract showed a wide range between 40 and 73% dose dependently. While the incubation of 3T3-L1 cells with S. tamariscina extract inhibited differentiation of preadipocytes and reduced lipid accumulation, the level of released free glycerol into culturing medium was increased in multiple concentrations. These results showed that S. tamariscina extract inhibit adipogenesis and pancreatic lipase activity. Thus, S. tamariscina extract can be a candidate for regulating lipid accumulation in obesity.

북한강 수역에 분포하는 Pseudanabaena 균주의 동정 및 2-MIB 생산 잠재성 분석

김건희,이세진,서경화,황순진,Kim, Keonhee,Lee, Sejin,Seo, Kyunghwa,Hwang, Soon-Jin 한국하천호수학회 2020 생태와 환경 Vol.53 No.4

이취미 물질인 2-MIB를 합성하는 원인종에 대한 정보는 담수생태계에서 이와 관련된 환경 및 경제적 문제를 해결하는 데 필수적이다. 본 연구는 북한강 수계에서 출현하는 Pseudanabaena strain을 분리·배양하고, 16S rDNA 염기서열을 이용하여 종 수준의 동정과 2-MIB 합성 유전자 탐색을 통해 이취미 물질 발생 잠재성을 분석하였다. 북한강 본류 지역(삼봉리, 조암면, 의암호 지역)에서 분리한 Pseudanabaena strain은 총 11개로서 NHUA201911과 NHPD201909 strain을 제외하고 단일세포의 크기는 서로 유사하였다. 그러나 16S rDNA 계통분석을 통한 유전자 염기서열의 유연관계를 분석한 결과, 분리된 strain들은 총 5개 종(P. cinerea, P. yagii, P. mucicola, P. galeata, P. redekei)으로 분류되었다(40~55% 유사도). 2-MIB를 합성하는 mibC 유전자는 P. cinerea 07 strain (NHUA202007-07)와 P. yagii (NHUA202007-08), P. redekei (NHUA201911)에서만 발견되었으며, 가스크로마토그래피 분석에 따라 실질적인 2-MIB 합성은 P. cinerea와 P. redekei 종에서 확인되었다. 본 연구결과는 분자생물학적 수준에서 북한강 수역에서 발생하는 Pseudanabaena속 남조류의 다양도에 대한 증거를 제공하는 연구로서 북한강 수계에서 2-MIB 생산 원인종에 대한 중요한 정보를 제공한다. Identification of the target species of 2-MIB (2-methyllisoborneol) production is crucial in the management of off-flavor problem in the freshwater system. This study was conducted to identify 2-MIB-producing Pseudanabaena strains occurring in the North Han River system using molecular genetic method. Eleven phenotypes of Pseudanabaena were isolated from several mainstream sites of the North Han River, including Sambong-ri, Joam-myun, and Lake Uiam areas. Despite of morphological similarity of the strains, the phylogenetic analysis using 16S rDNA classified them into different species with low genetic similarity (40~55%). Isolated Pseudanabaena strains were converged to four species; Pseudanabaena cinerea, P. yagii, P. mucicola, and P. redekei. Among them, the 2-MIB synthesizing gene (mibC) was detected in P. cinerea, P. yagii, and P. redekei. However, actual 2-MIB production was detected only in P. cinerea and P. redekei based on gas chromatography analysis. This study is the first report of the molecular identification of Pseudanabaena strains and their 2-MIB production potential in Korea. The results of this study provides an evidence of species diversity of Pseudanabaena occurring in the North Han River.

정전용량센서를 이용한 대구경 비구면 형상의 기상측정에 관한 연구

김건희,원종호,Kim, Geon-Hee,Won, Jonh-Ho 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3

This paper described about on-machine profile measurement of aspheric surfaces using contact probing technique in ultra precision machine. A contact probe has been designed as a sensing device to obtain measuring resolutions in nanometer regime using a circle leaf spring mechanism and a capacitive-type sensor. The contact probe which is installed on the z-axis is In touch with the aspheric objects which is fixed on the spindle of the diamond turning machine(DTM) during the measuring procedure. The x, z-axis motions of the machine are monitored by a set of two orthogonal plane mirror type laser interferometers. As a results, the developed contact probe on-machine measurement system showed 10 nanometers repeatability with a ${\pm}2{\sigma}$ and uncertainty of 200 nmPv.

Optimum Manufacturing Processes of Micro-drill

김건희,Kim, Gunhoi The Korean Society of Manufacturing Process Engine 2002 한국기계가공학회지 Vol.1 No.1

Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly suggests between tool life and drilling torque acquired in the inprocess monitoring system.