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        • KCI등재

          빅 데이터 기반의 체납 수용가 예측 모델

          정재안,이규환,정회경 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.7

          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. 본 논문에서는 지자체의 요금 체납을 줄이기 위해 특정 지자체를 대상으로 검침원의 면담 등을 통해 지방상수도통합정보시스템에서 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.

        • KCI등재

          친생자감정의 현황과 문제점

          황적준,정재안 大韓法醫學會 1992 대한법의학회지 Vol.16 No.2

          Paternity testing refers to attempts to determine whether a putative father is in fact the biological father of a given child. Most of current paternity testing still depends upon the use of genetic markers. This in turn is based on the study of those traits which show genetic polymorphism. Because of relative ease of sampling, most of these tests are done on blood samples. As with many genetic studies, the trend appears to be moving the use of DNA markers which can be used to establish a genetic fingerprint of an individual. So, we review the scientific knowledges and technical problems associated with paternity testing, and its technologies in future.

        • 대학원에서의 교육행정전공 운영 현황과 활성화 과제

          정재안(Jung, Jea-An),강일영(Kang Eel-yeong),최규연(Choi, Kyu-Yeon) 전북대학교 교육문제연구소 2018 교육문제연구 Vol.24 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          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.

        • KCI등재

          DIS80의 遺傳子型 決定을 위한 PCR法의 條件에 관한 硏究

          鄭宰安,黃迪駿,李羲碩,宋垠燮 大韓法醫學會 1994 대한법의학회지 Vol.18 No.1

          The polymerase chain reaction(PCR) is known to be a very sensitive method of nucleic acid synthesis by which a particular segment of deoxyribonucleic acid(DNA) can be specifically amplified. However, as no single protocol will be appropriate to all situations, it requires to optimize the PCR conditions for a given application, especially analytical procedure to amplified fragment length polymorphism of VNTR region. Recently, typing of VNTR regions in the field of forensic science is almost done by PCR, but this reaction ofter results in a number of potential problems including generation of recombinant alleles during the extension phase. The objective of this paper is to evaluate the cause of PCR products of a abnormal length, and to set up the guideline for the reliable production of D1S80VNTR region in the human genome by studying several parameters that influence polymerase chain reaction. In the study of D1S80 VNTR region to be amplified, the following PCR conditions are optimal in the 50㎕ of reaction volume and under the temperature conditions of 95℃ for 1 minute, 65℃ for 2 minutes and 72℃ for 2 minutes. 1. The adequate concentration of MgCl₂ is within the range of 1.0 to 2.0 mM. 2. The high activities of Taq polymerase show about 0.5 to 1.5 units without generation of the undesired products. 3. The adequate amount of template DNA is about 30 to 50ng, although the template DNA can be amplified with the minimum of 40pg. 4. With the 50ng of template DNA, the adequate numbers of PCR cycle range 25 to 27 cycles. 5. Artifact production by PCR is minimal within the range of 0.2 to 0.3μM of each primer concentration. With the above conditions, amplified fragment length polymorphism (AMP FLP) obtained by polymerase chain reaction from the genomic DNAs of 4 Korean families (one family with 8 offsprings and both parents, 3 families composed of each one child and both parents) were analyzed to test the applicability of this technique to paternity testing. The results obtained present reliable parent child relationships based on the correct genotypes of D1S80, without any undesired PCR products of abnormal length that are postulated as heteroduplex resulting from cross annealing or hybridization between the amplified target DNA.

        • KCI등재

          pV47-2 탐침으로 검색되는 유전자지문에 의한 가족 구성원간의 관계 분석

          鄭宰安,黃迪駿 大韓法醫學會 1993 대한법의학회지 Vol.17 No.2

          Human DNA fingerprints using multilocus ministellite probe pV47-2 are analyzed to investigate their mutation rate and band sharing rates between paternal parent and child, maternal prarent and child, and among sibs within each family in 106 individuals consisting of 33 korean families. The estimate of mutation rate is 0.1397 per individual or 0.0113 per band. The band sharing rates of fathers and nothers with their children do not differ significantly, their overall mean values are 53.1% and 57.1%, respectively. The average observed rate for parent-child band sharing is 55.45%, whereas its expected rate is 56.97%, which is distributed as binominal at 5% level of significance. The average band sharing rate between sibs is ranged from 26 to 87%(mean : 58.87%), which is also distributed as binominal at 5% level of significance. Though family relationships assessed from the band sharing rates between parent and child, and between members of both parents and child, these rates are prospective to be success fuly applied for distinguishing family relationship.

        • KCI등재

          韓國人에서 pV47-2 多座位 探針로 檢索되는 VNTR 遺傳座位의 對立遺傳子 頻度

          鄭宰安,黃迪駿,李昇燮 大韓法醫學會 1994 대한법의학회지 Vol.18 No.1

          Individual differences at the level of their DNA sequence have been known to exist throughout the human genome. One of the simplest methods to visualize these DNA polymorphisms consist of the hybridization of a cloned fragment to restriction enzymes-digested DNA from unrelated individuals, and fractionation by agarose gel electrophoresis. The screening of a large number of DNA fragments by this procedure has resulted in the identification of numerous restriction fragment length polymorphisms(RFLPs) corresponding to DNA sequences described from all human genome. The important feature of these size variation is that they are inherited according to the rules of Mendelian genetics. The allele frequency distribution of highly polymorphic VNTR loci had been determined in 113 Korean living over the Seoul metropolitan area. 113 samples from unrelated individuals were digested with Hae Ⅲ restriction enzyme and hybridized with the recombinant DNA probe, pV47-2. By the analysis of DNA fingerprints detected by pV47-2 multi-locus probe, results were obtained as following:. 1. The size range of the DNA fragments detected for the VNTR polymorphism varied from 5,032 to 37,143 base pairs(bp). 2. The number of alleles identified under the experimental conditions (more than 5Kb) used in the study was 62. 3. The mean band-sharing coefficent is 0.18, and the mean probalility that all fragments detected by pV47-2 in individual A are also present in B is (0.18)? = 0.4 ×10?. 4. The mean allele frequency of highly polymorphic VNTR loci dectected by pV47-2 probe is 0.1, and its heterozygosity is 90%. The information obtained can be used for the paternity testing and the analysis of forensic materials.

        • KCI등재

          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.

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