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정재안,이규환,정회경,Jeong, Jaean,Lee, Kyouhwan,Jung, Hoekyung 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.7
본 논문에서는 지자체의 요금 체납을 줄이기 위해 특정 지자체를 대상으로 검침원의 면담 등을 통해 지방상수도 통합정보시스템에서 체납에 영향을 미치는 내부 데이터 요소를 찾았다. 또한 국가 통계 데이터 중에서 체납에 영향을 미치는 후보 데이터를 도출하였다. 독립변수가 종속변수에 미치는 영향도는 정보이득이라는 데이터 집합에서 종속변수에 대한 무질서도를 조사하여 표본 데이터를 수집하였다. 그리고 빅 데이터 분석 알고리즘인 의사결정트리와 로지스틱 회귀기법 중 어느 알고리즘이 더 높은 예측율을 나타내는지 n-fold cross-validation 방법을 사용하여 평가하였다. 이를 통해 지자체의 데이터를 기초로 알고리즘의 성능을 비교한 결과 의사결정트리가 로지스틱회귀보다 더 정확한 수용가 납부 패턴을 찾을 수 있음을 확인하였다. 머신러닝을 이용한 분석 알고리즘 모델 개발의 과정에서는 알고리즘의 정확성 향상을 위해 의사결정트리의 복잡성과 정확성에 직접적인 영향을 주는 최소 데이터 개수와 최대 순도라는 두 개의 환경변수의 최적값을 도출하였다. In this paper, to reduce the unpaid rate of local governments, the internal data elements affecting the arrears in Water-INFOS are searched through interviews with meter readers in certain local governments. Candidate data affecting arrears from national statistical data were derived. The influence of the independent variable on the dependent variable was sampled by examining the disorder of the dependent variable in the data set called information gain. We also evaluated the higher prediction rates of decision tree and logistic regression using n-fold cross-validation. The results confirmed that the decision tree can find more accurate customer payment patterns than logistic regression. In the process of developing an analysis algorithm model using machine learning, the optimal values of two environmental variables, the minimum number of data and the maximum purity, which directly affect the complexity and accuracy of the decision tree, are derived to improve the accuracy of the algorithm.
Matlab/Simulink 기반의 IEC 플리커미터를 이용한 플리커 저감효과 모의에 대한 연구
鄭宰安(Jae-Ahn Jung),趙秀桓(Soo-Hwan Cho),權世爀(Kwon Sae Hyuk),張吉洙(Gilsoo Jang),姜汶昊(Moon-Ho Kang) 대한전기학회 2009 전기학회논문지 Vol.58 No.2
Flicker, also known as voltage fluctuation, is a newest problem of power quality issues, because it is caused by nonlinear loads such as electrical arc furnace and large-scale induction motor, which are country-widely used as the heavy industries of a country develop. An international standard, International Electrotechnical Commission (IEC) 61000-4-15, was published in 1997 and revised in 2003. With increasing concerns about flicker, its mitigation methods have been also studied. General countermeasures for flicker are divided into three categories: a) enhancing the capacity of supplying system, b) Series elements including series reactor and series capacitor and c) power electronic devices including static VAR compensator (SVC) and static synchronous compensator (STATCOM). This paper introduces how to mitigate the voltage flicker at the point of common coupling (PCC) and presents how to simulate and compare the flicker alleviating effects by each mitigation method, using IEC flickermeter based on the Matlab/Simulink program.
정재안(Jung, Jea-An),강일영(Kang Eel-yeong),최규연(Choi, Kyu-Yeon) 전북대학교 교육문제연구소 2018 교육문제연구 Vol.24 No.1
이 논문은 우리나라 대학원에서의 교육행정전공 운영 현황과 활성화 과제를 분석하는 연구이다. 이를 위해 지난 10년간의 우리나라 일반대학원 교육학과, 전문대학원 교육행정전공, 특수대학원 중 교육대학원 교육행정전공의 운영 현황을 한국교육개발원교육통계 및 대학알리미와 각 대학원 홈페이지를 활용하여 분석하였으며 그 결과는 다음과 같다. 일반대학원 및 전문대학원은 전공 개설 수, 지원자 및 입학자, 재학생, 외국인 유학 생, 학위취득자 수는 증가하였지만 비율은 감소하여 내실화가 부족했다. 교육대학원은 일반대학원 및 전문대학원에 비해 큰 폭으로 감소하였다. 각 대학원은 전공명칭 변경을 시도하였으나 특성화가 반영되지 못했고 교육목표는 추상적, 포괄적이었으며 교육과정은 유사할 뿐만 아니라 시대상을 반영하지 못했다. 일부 대학에서 학점이수 및 보고서 등과 같은 학위논문대체 제도를 시행하는 대학들이 있었다. 연구 결과를 바탕으로 우리나라 대학원에서의 교육행정전공 활성화 과제는 정체성 및 특성화 강화, 교육행정학 교육의 신규 수요 발굴, 교육행정학 교육 및 연구의 질관리를 강화해야 한다. This study is a study to analyze the current condition and the activation of educational administration major in Korean graduate school. To do this, we analyzed the education department of general graduate school, the educational administration major of professional graduate school, and educational graduate school among special graduate school during the last 10 years by using educational statistics of KEDI and university Allimi site and each graduate school homepage. The results are as follows. The number of major courses in general graduate schools and professional graduate schools, applicants and enrollees, enrolled students, foreign students, and degree acquirers increased. However, the ratio decreased and the improvement was lacking. The number of graduate schools of education decreased sharply compared to general graduate schools and professional graduate schools. Each graduate school attempted to change the name of the majors, but the specialization was not reflected. The educational objectives were abstract and inclusive, and the curriculum was similar and did not reflect the change of the age. Some universities have conducted a dissertation substitution system such as credit and reports. It is necessary to strengthen the identity and characterization, to find new demand for educational administration education, and to improve quality management of research and education of educational administration in Korean graduate schools.
상악동 골이식술을 위한 이식재의 부피 측정 - CT를 이용한 환자 대조군 연구
김형욱,이슬기,정재안,신진업,엄윤섭,김기영,김종식,송윤정,홍순민,박준우,Kim, Hyung-Wook,Lee, Seul-Ki,Chung, Jae-An,Shin, Jin-Eob,Um, Yun-Sub,Kim, Ki-Young,Kim, Jong-Sik,Song, Yun-Jung,Hong, Soon-Min,Park, Jun-Woo 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.5
Purpose: The aim of this study is to determine whether a difference in the amount of bone graft material is needed between edentulous patients and dentulous patients and to calculate the amount of augmentation for a sinus lift procedure. Methods: 19 patients(20 sinuses) were included to measure maxillary sinus volume. Facial CT scanning was performed using MX 8000 IDT CT devices(Philips, USA). And it was used for IDLvm(The IDL Virtual Machine) 6.0, CT Volume Analyzer Ver 2.3 program to measure maxillary sinus volumes Results: At edentulous patients, volumes(mean${\pm}SD$) of the inferior portion of the sinuses were $0.56{\pm}0.13cm^3$(5mm height), $2.35{\pm}0.57cm^3$(10mm height), $4.85{\pm}1.10cm^3$(15mm height). At dentulous patients, volumes(mean${\pm}SD$) of the inferior portion of the sinuses were $0.41{\pm}0.18cm^3$(5mm height), $1.76{\pm}0.42cm^3$(10mm height), $3.80{\pm}0.84cm^3$ (15mm height). A significant correlation was found between augmentation height(5mm, 10mm, 15mm) and the calculated sinus volume.(p=0.027, p=0.018, p=0.044) Conclusions: A significant correlation was found between augmentation height(5mm, 10mm, 15mm) and the calculated sinus volume. Detailed preoperative knowledge of sinus lift augmentation volume is helpful in determining the appropriate amount of the bone graft material.
가토골수에서 유래된 골모세포의 하악골 결손부 이식시 골형성에 미치는 효과
박영주,남정훈,김보균,전민수,정재안,이정원,안장훈,강태인,박미희,임성철,Park, Young-Ju,Nam, Jeong-Hun,Kim, Bo-Gyun,Jeon, Min-Su,Chung, Jae-An,Lee, Jung-Won,Ahn, Jang-Hoon,Gang, Tae-In,Park, Mi-Hee,Lim, Sung-Chul 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.4
Purpose: The purpose of this experiment was to evaluate the clinical effect of cultured autoglogous osteoblasts as a way to treat the defect of mandible in rabbits. Materials and Methods: Twelve rabbits were used to determine the rate of osteogenesis. The osteoblasts were obtained from the iliac crest of rabbits using aspiration. They were then cultured in Dulbecco's Modified Eagles's Medium (DMEM) with beta-glycerophosophatate, L-ascorbicacid, and dexamethasone to proliferate and differentiate osteoprogenitor cells. The expression of osteogenic markers were detected by reverse transcription-polymerase chain reaction (RT-PCR) and silver nitrate staining techniques. Five, 10-mm holes were placed in each rabbit mandible to simulate defective regions with the use of a low speed trephine bur. In the experimental group, the previously cited defects were grafted with both activated osteoblastic and autogenous bone. The control group, however, was only grafted with autogenous bone. Both groups were then analyzed at 2, 4, and 8-week intervals using bone histomorphometric analysis. Results: According to histomorphologic analysis, the rates of new bone formation at the 2, 4, and 8-week intervals were 36%, 51%, and 23% for the control group, respectively; 52%, 39%, and 28%, for the experimental group, respectively. The experimental group showed higher rates of new bone formation compared to the control group at both the 2-week and 8-week interval. Conclusion: Bone marrow-derived osteoblasts seems to be a promising bone graft material.
자료포락분석(DEA)을 활용한 교육 효율성 연구의 특징과 시사점
강일영(Kang Eel-yeong),최규연(Choi, Kyu-Yeon),정재안(Jung, Jea-An) 전북대학교 교육문제연구소 2018 교육문제연구 Vol.24 No.2
이 연구는 자료포락분석(DEA)을 활용한 교육 효율성 연구의 특징을 분석하고 시사점을 도출하였다. 연구대상은 최근 10년 이내 초등학교, 중학교, 고등학교, 대학교, 각 학교급별 및 교육관련 기관들이다. DEA을 활용한 교육 효율성 연구의 특징은 다음과 같다. 교육 효율성 연구가 전반적으로 미진하고 연구대상이 편중되어 있고 연구범위가 넓어 DMU의 유사성에 문제기 있다. 투입 및 산출변수 선정을 위한 객관적인 기준이 없고 연구를 위한 자료에 오류가 많다. 특징 분석을 바탕으로 시사점은 다음과 같다. 교육 효율성 연구 주제 및 대상의 다양화가 필요하고 DMU의 유사성을 높이기 위해 세밀한 연구범위 설정이 요구된다. 그리고 연구의 타당도 및 정확도 향상을 위해 변수 선정을 위한 객관적인 기준 마련과 권위있는 자료 생성 및 접근 가능성을 제고할 필요가 있다. This study analyzed the characteristics of educational efficiency research using data envelopment analysis(DEA), and derived implications. The research subjects are elementary school, middle school, high school, university, and educational institutions within the last 10 years. The characteristics of the educational efficiency study using DEA are as follows. As the educational efficiency study is poor overall, the research subjects are concentrated, and the scope of research is wide, the similarity of DMU is low. There are no objective criteria for selection of input and output variables, and there are many errors in the research data. The implications based on the characteristics analysis are as follows. It is necessary to diversify the subjects and main subjects of the educational efficiency research, and to set up a detailed research scope in order to increase the similarity of DMU. It is necessary to establish objective criteria for selecting variables, and to create reliable data and increase accessibility, in order to improve the validity and accuracy of the research.