ICP 스퍼터를 이용한 TMR 소자 제작에서 절연막의 플라즈마 산화시간에 따른 미세구조 및 자기적 특성 변화

이영민,송오성,Lee, Yeong-Min,Song, O-Seong 한국재료학회 2001 한국재료학회지 Vol.11 No.10

We prepared tunnel magnetoresistance(TMR) devices of Ta($50\AA$)/NiFe($50\AA$)/IrMn(150$\AA$)/CoFe($50\AA$)/Al ($13\AA$)-O/CoFe($40\AA$)/NiFe($400\AA$)/Ta(50$\AA$) structure which has 100$\times$100 $\mu\textrm{m}^2$ junction area on $2.5\Times2.5 cm^{2}$ $Si/SiO_2$ ($1000\AA$) substrates by a inductively coupled plasma(ICP) magnetron sputter. We fabricated the insulating layer using a ICP plasma oxidation method by varying oxidation time from 80 sec to 360 sec, and measured resistances and magnetoresistance(MR) ratios of TMR devices. We used a high resolution transmission electron microscope(HRTEM) to investigate microstructural evolution of insulating layer. The average resistance of devices increased from 16.38 $\Omega$ to 1018 $\Omega$ while MR ratio decreased from 30.31 %(25.18 %) to 15.01 %(14.97 %) as oxidation time increased from 80 sec to 360 sec. The values in brackets are calculated values considering geometry effect. By comparing cross-sectional TEM images of 220 sec and 360 sec-oxidation time, we found that insulating layer of 360 sec-oxidized was 30 % and 40% greater than that of 150 sec-oxidized in thickness and thickness variation, respectively. Therefore, we assumed that increase of thickness variation with oxidation time is major reason of MR decrease. The resistance of 80 sec-oxidized specimen was 160 k$\Omega$$\mu\textrm{m}^2$ which is appropriate for industrial needs of magnetic random access memory(MRAM) application.

3DMM 표정 계수 조작을 통한 얼굴 감정 제어 기법

이영민(Yeong Min Lee),박지훈(Jihoon Park),송병철(Byung Cheol Song) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6

침습성 폐 아스페르길루스증을 동반한 급성 간질성 폐렴

이영민 ( Lee Yeong Min ),윤혜경 ( Yun Hye Gyeong ),김주인 ( Kim Ju In ) 대한결핵 및 호흡기학회 2002 Tuberculosis and Respiratory Diseases Vol.52 No.1

평면형 발진기 적용을 통한 국방 무기체계 품질 향상 방안 연구

이영민(Yeong-Min Lee),정민경(Min-Kyung Jeong),이원영(Won-Young Lee),최은진(Eun-Jin Choi) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.8

4차 산업 혁명으로 인한 첨단기술 발전과 함께 국방 분야 또한 국방혁신 4.0을 추진하며 과학기술 기반의 첨단전력 확보를 추진하고 있는 실정이다. 특히, AI 기반 무인 체계를 효율적으로 전력화하기 위해 네트워크 연동·표준, 드론 통합 관제체계 구축, 필요 주파수 확보 및 활용 기술 개발 등 기반 체계 구축을 계획하고 있다. 대표적 기반 체계로 무선 통신 시스템이 있으며 이는 AI, 무인화, 자율주행 등 첨단기술의 실제 전력화 연계에 필수적이라고 할 수 있다. 본 논문에서는 무선 통신 시스템의 핵심 부품인 발진기의 특성, 구조, 종류를 소개하고 대표적 발진기인 유전체 공진발진기의 제작 및 양산, 품질 관점에서의 취약점을 제시하였다. 이러한 취약점을 대체하기 위한 평면형 구조의 발진기를 제시하고 이로 인해 발생되는 품질 및 경제적 효과도 분석 및 제시하였다. 본 논문에서 제시된 구조의 발진기를 국방분야 무선통신 시스템에 적용한다면 경제성, 개발 용이성, 품질 완전성 향상이 가능할 것으로 사료된다. With the development of advanced technologies in the Fourth Industrial Revolution, the defense sector is pushing for defense innovation 4.0 to secure an advanced force based on science and technology. In particular, to efficiently secure an unmanned system based on artificial intelligence (AI), the defense sector is preparing to establish an infrastructure system with features such as a network linkages and standards, an integrated drone control system, necessary frequencies, and utilization technologies. A representative infrastructure system is a wireless communication system, which is essential for the integration of advanced technologies such as AI, unmanned vehicles, and autonomous driving. In this paper, we discuss the characteristics, structure, and types of oscillators, which are key components of wireless communication systems. We also present vulnerabilities in terms of manufacturing, mass production, and quality of dielectric resonance oscillators. The use of a planar oscillator is proposed to address these vulnerabilities. The quality and economic effects generated by using this oscillator were analyzed. Applying this oscillator to wireless communication systems in defense could improve economic feasibility, ease of development, and quality.

개혁의 현장 : 광주광역시 북구 ; 주민과 함께하는 "아름다운 마을 만들기"

이영민 ( Lee Yeong Min ) 대한지방행정공제회 2003 地方行政 Vol.52 No.593

복강경술식을 이용한 자궁절제술에서 창상 관련 합병증 감소를 위해 시행한 추가적인 질소독제의 효용성 비교

이영민 ( Yeong Min Lee ),김신영 ( Shin Young Kim ),정민형 ( Min Hyung Jung ),이보연 ( Bo Yon Lee ),허주엽 ( Chu Yeop Huh ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.5

Objectives: To compare the efficacy of additional vaginal dressing disinfectants for reduction of wound-related complications in laparoscopic hysterectomy. Methods: From September 2006 to June 2007, 226 of 243 patients underwent laparoscopic hysterectomy were enrolled. The patients were classified into three groups (no additional disinfectant (n=76), povidone-iodine (n=68), and chlorhexidine (n=82) for disinfectants) and the short term postoperative complications related with wound morbidity were recorded by 2 months out-patient follow up. Results: The mean age of all patients was 46.6±7.6 years old, and the mean BMI (body mass index) was 24.2±3.4, mean operation time was, 137.2±48.0 minutes, and the mean estimated blood loss was 451.8±240.2 ml. There was no significant difference among three groups in their mean age, mean BMI, frequency of vaginal culture (+) before surgery, frequency of wound/stump infection after surgery, frequency of wound disruption, and frequency of fever. The significant difference was shown in mean operation time and mean estimated blood loss but those did not affect frequency of vaginal culture (+) before surgery, frequency of wound/stump infection after surgery, frequency of wound disruption, and frequency of fever. Conclusions: We conclude that the kind of disinfectant for additional vaginal dressing for laparoscopic hysterectomy does not matter deeply in causing short term wound-related complications after the surgery.

중학교 3학년 학생의 학습습관과 학교적응이 학업성취도에 미치는 영향

이영민(Lee Yeong Min) 한국복지상담교육학회 2018 복지상담교육연구 Vol.7 No.2

본 연구는 중학교 3학년 학생들의 학습습관과 학교적응이 학업성취도에 미치는 영향의 요인을 분석하였다. 구체적인 연구 문제로 중학교 3학년의 학습습관 및 학교적응과 학업성취도 간 양상을 살펴보고 세 변수 간의 유의한 상관관계를 살펴보았다. 또한, 중학교 3학년 학생의 학습습관과 학교적응이 학업성취도에 미치는 영향력의 상대적인 크기를 알아보고 그 차이를 검증하였다. 연구 대상은 한국청소년정책 연구원의 한국 아동․청소년 패널 조사의 초4 코호트의 6차년도 (2015년 기준, 중3) 자료를 사용하였다. 대상은 총 2,378명이며, 사용된 측정도구는 학습습관, 과목별 주관 학업성취도와 학교적응의 세 가지의 척도이다. 자료분석을 위해서 SPSS Windows 22.0 프로그램을 이용해 중학교 3학년 학생의 학습습관과 학교적응이 학업성취도에 미치는 영향을 분석하였다. 연구결과는 다음과 같다. 첫째, 중학교 3학년 학생의 학습습관은 전체적으로 보통 이상의 높은 점수로 학습습관이 잘 형성되어 있는 것으로 나타났다. 특히 학습습관에서는 여학생보다 남학생의 점수가 더 높은 것으로 나타났다. 둘째, 학교적응은 전체적으로 높은 수준을 나타냈으며 학교적응의 경우 남학생이 여학생보다 더 학교생활에 잘 적응하는 것으로 나타났다. 셋째, 학업성취도는 전체적으로 높은 수준으로 나타났다. 넷째, 학습습관은 중학교 3학년 전체 학생의 학업성취도에 영향을 주었다. 남학생 경우 행동통제가 학업성취도에 가장 큰 영향을 주는 것으로 나타났으며, 여학생의 결과도 동일했다. 따라서 학습습관과 학업성취도의 영향 변인은 성별의 차이가 없는 것으로 나타났다. 다섯째, 학교적응은 중학교 3학년 전체 학생의 학업성취도에 영향을 주었다. 특히 학습활동이 학업성취도에 미치는 영향력이 가장 컸다. 따라서 학교와 가정에서 중학교 3학년 학생의 학업성취도 향상을 위하여 다양한 학교적응 프로그램과 적절한 학습습관에 대한 지원체계와 방향 제시가 필요함을 시사한다. This research analyzed the influential factors of grade 9 students study habits and school adjustment on academic achievement. More specifically, the patterns among their study habits, school adjustment, and academic achievement were explored. The resultant gender difference was verified, and the significant correlation of the three variables was investigated. Furthermore, relative effects of the students study habits and school adjustment on academic achievement and the resultant gender difference was studied. For the research, the data of Year 6 of Grade 4 Cohort (As of 2015, grade 9) from Korean Children & Youth Panel Survey by National Youth Policy Institute were utilized. A total of 2,378 students were recruited and studied with three scales for study habits, academic achievement by subject, and school adjustment. SPSS Windows 22.0 Program was used to analyze the effects of grade 9 students study habits and school adjustment on academic achievement. The research results are as follows: First, it was revealed that they had well developed study habits, generally showing high scores above average. Study habits, in particular, showed that male students had higher scores than the counterparts. Second, school adjustment was generally high, and it was revealed that male students better adjusted to school than female students. Third, the level of academic achievement was high in general. Fourth, study habits affected the entire grade 9 students academic achievement. Both male and female students revealed that behavioral control had the greatest effects on academic achievement. Accordingly, there was no gender difference in the influential variables of study habits and academic achievement. Fifth, school adjustment affected the entire grade 9 students academic achievement. In particular, learning activities showed the greatest effect on academic achievement. Therefore, this research implies that various school adjustment programs and proper support and guidance for study habits are required at school and home to help improve grade 9 students academic achievement.

AI 적용 체계 데이터 품질 점검 및 운용유지단계 모니터링 실증 연구

이영민(Yeong-Min Lee),강지훈(Ji-Hoon Kang),정민경(Min-Kyung Jeong),박주영(Joo-Young Park) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.8

전세계적으로 인공지능(AI)의 발전과 함께 다양한 AI 기술이 개발되고 민수 분야 현업에 적용되고 있는 상황이다. 우리나라 국방 분야에서도 국방혁신 4.0 등을 통해 다양한 AI 관련 정책 제도와 AI 적용 체계 획득이 추진되고 있다. AI 적용 체계의 품질을 확보하기 위한 방안으로 데이터의 품질 점검과 지속적으로 진화되는 AI의 특성에 맞게 지속 확인 하는 업무도 필요하다. 본 논문에서는 AI 성능 평가와 모니터링 업무의 기본 개념을 설명하고, 실제 운용 중인 AI 적용체계를 대상으로 품질 점검 및 성능 개선을 수행한 실증 결과를 제시하였다. 4차 학습 및 성능 평가 실증을 통해 객체별 성능지표 α 및 β의 향상도를 확인 할 수 있었으며, 보완해야 할 사항에 대해서도 파악할 수 있었다. 이러한 모니터링 업무를 통해 획득된 AI 체계의 품질을 개선 시킬 수 있으며, 개발 및 양산 단계로의 피드백을 통해 후속 AI 체계의 성능 고도화까지 가능할 것으로 사료된다. With the development of artificial intelligence (AI), various AI technologies have been developed worldwide and are being applied to private demand. In the Korean defense sector, various AI-related policy systems and AI application systems are also being acquired through Defense-innovation 4.0. To secure the quality of the AI application system, it is also necessary to check the quality of data and continue to check according to the characteristics of continuously evolving AI. This paper explains the basic concepts of AI performance evaluations and monitoring and reports the results of a quality inspection and performance improvement for the AI application system under actual operation. Improvements in performance indicators α and β for each class and the matters that need to be supplemented could be confirmed by demonstrating the 4th learning and performance evaluation. The quality of the acquired AI system can be improved by such monitoring, and feedback on the development and mass production stages will improve the performance of subsequent AI systems.

초음파검사에서 기능성 난소낭종으로 보이는 환자들에 대한 후향적 고찰

이영민 ( Yeong Min Lee ),정난희 ( Nan Hee Jeong ),이보연 ( Bo Yon Lee ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.7

Objective: The purpose of this study is to identify the cooperation between histologic diagnosis and sonographic pattern of functional ovarian cyst. And also determine performances of ultrasound, computed tomography, and tumor markers in diagnosis of functional ovarian cyst. Methods: We retrospectively reviewed the medical records of 129 patients with ovarian cystic tumors undergone an adnexectomy between 2006 and 2008 at Kyung Hee medical center. All patients performed sonographic examinations, and a computed tomography or CA-125 or CA-19-9 were done if needed. Results: Among 129 patients, 35 patients were diagnosed to be functional ovarian cyst. Sensitivity and specificity of ultrasound for functional cyst was 37.1% and 82.9%, respectively. Sensitivity and specificity of computed tomography was 47.6% and 69.3%, respectively. Tumor markers were not useful to detect functional ovarian cyst. If any one of the two appeared functional ovarian cyst, the sensitivity and specificity was 66.6%, 67.7% each. Conclusion: Computed tomography can be used as an alternative option replacing ultrasound, but combination of computed tomography and ultrasound does not provide the additional benefit in early diagnosis of functional ovarian cyst.

범용 CCTV의 펄스 전류 주입 실험 결과 분석

이영민(Yeong-min Lee),이영순(Young-soon Lee) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10