• Title/Summary/Keyword: 표본상관계수

Search Result 140, Processing Time 0.024 seconds

An Analysis of Educational Effectiveness of Elementary Level AI Convergence Education Program (초등 AI 융합교육 프로그램의 교육 효과성 분석)

  • Lee, Jaeho;Lee, Seunghoon;Lee, Donghyeong
    • Journal of The Korean Association of Information Education
    • /
    • v.25 no.3
    • /
    • pp.471-481
    • /
    • 2021
  • The purpose of this study is to analyze the effectiveness of AI convergence education program. To this end, the "Elementary Science AI Convergence Education Program for Machine Learning" developed in previous research were taught to elementary school students in the fourth to sixth grades in eight times. The quantitative changes of each factor were analyzed by R program, and the effectiveness of education was analyzed by Pearson correlation and paired samples t-test. As a result, there is a deep correlation between "Attitude to AI technology, Scientific preference and STEAM Literacy" and technical average has improved in many factors. Therefore, AI convergence education program is meaningful in terms of education, and if AI education and AI convergence education are implemented into the primary formal education curriculum, they will have a positive effect.

Investigation on Methods to Improve the Reliability of Education Satisfaction Surveys: Focused on the S University Case (교육수요자 만족도조사의 신뢰성 제고방안 탐색: S대학교 사례를 중심으로)

  • Ahn, Su-Hyun;Lee, Sang-Jun
    • Journal of Digital Convergence
    • /
    • v.15 no.12
    • /
    • pp.71-77
    • /
    • 2017
  • In order for the consumers of education and university to be mutually communicating well, satisfaction surveys with a correct system are essential. This study points out the causes for insincere responses found in the process of education satisfaction surveys while discussing possible methods to elicit sincere responses from the students. As a result of analyzing S University, it was observed that enforced online evaluation methods did have a high response rate but also monotonously insincere responses showed to have a high ration among them. A second study was carried out in order to improve the research method after confirming the reliability of the research. Study results sowed that through a representative sample survey, monotonous response patterns decreased and the data distribution satisfied normal distribution. Moreover, a focus group interview was carried out in order to understand the root causes and possible solutions to the problem. Lastly, this study revealed the need of diversified attempts and research in order to secure reliability in education satisfaction surveys while proposing methods of improvement.

Comparison of WBCs and RBCs Concordance between the Cobas u 701 Analyzer and Three Manual Microscopy Methods in Urine Sediment (소변 침전물에서 Cobas u 701 Analyzer와 세 가지 수동 현미경검사법의 백혈구와 적혈구의 일치도 비교)

  • Hyeok-Jae LEE;Min-Hyeok LEE
    • Korean Journal of Clinical Laboratory Science
    • /
    • v.55 no.2
    • /
    • pp.82-92
    • /
    • 2023
  • Urine sediments are performed by a microscopic examination of centrifuged urine by medical technologists. This study examined different urine sediment preparation procedures. The 107 fresh urine specimens that tested positive from white blood cells (WBCs) and red blood cells (RBCs) in the urine dipstick test and the cobas u 701 analyzer, respectively, were selected for manual microscopy. This study evaluated an automated urine sediment analyzer and three manual microscopy methods for WBCs and RBCs. The methods were performed according to the test guidelines. The coefficients of determination between the cobas u 701 analyzer and the Korean Association of Quality Assurance for Clinical Laboratory (KAQACL) for WBCs and RBCs were r2=0.977 and r2=0.970, respectively. The concordance rates between the cobas u 701 analyzer and KAQACL for WBCs and RBCs were 74.8% and 77.6%, respectively. A good correlation and concordance with the automatic analyzer were shown when the specimens were prepared and examined using the KAQACL method. Consequently, the differences in the urine sediment preparation procedures affected the sediment concentrations, influencing the cell number per high power field (HPF).

Morphometric Analyses on 24 Species (13 Families of Six Orders) of Korean Mammals (한국산 포유동물 24종(13과 6목)의 형태적 형질의 분석)

  • 고홍선
    • The Korean Journal of Zoology
    • /
    • v.32 no.1
    • /
    • pp.14-21
    • /
    • 1989
  • Four external and 22 cranial characters of 279 specimens representing 24 species of six orders of Korean mammals were measured. The data were analyzed by phenetic methods such as ordination as well as clustering techniques. Morphological distances were also calculated. Phenetic studies yield taxonomic placements of Siberian mink, Palearetic squirrel, and big white-toothed shrew which are incorrect. Morphological differences among Korean mammals at ordinal level in the taxonomic hierarchy are larger than those among other mammals: morphological differences below ordinal level are comparable to those among other mammals. Average taxonomic distances and morphological differences among Korean mammals at various levels in the taxonomic hierarchy are jointly monotonic, although the value of Pearson's product-moment correlation coefficient between average taxonomic distance matrix and morphological difference marrix is 0.59.

  • PDF

Banded vector heterogeneous autoregression models (밴드구조 VHAR 모형)

  • Sangtae Kim;Changryong Baek
    • The Korean Journal of Applied Statistics
    • /
    • v.36 no.6
    • /
    • pp.529-545
    • /
    • 2023
  • This paper introduces the Banded-VHAR model suitable for high-dimensional long-memory time series with band structure. The Banded-VHAR model has nonignorable correlations only with adjacent dimensions due to data features, for example, geographical information. Row-wise estimation method is adapted for fast computation. Also, two estimation methods, namely BIC and ratio methods, are proposed to estimate the width of band. We demonstrate asymptotic consistency of our proposed estimation methods through simulation study. Real data applications to pm2.5 and apartment trading volume substantiate that our Banded-VHAR model outperforms traditional sparse VHAR model in forecasting and easy to interpret model coefficients.

Assessment and Verification of Prediction Model(NIER('99)) for Road Traffic Noise in the Apartment Complex (아파트단지에서 국립환경과학원 도로교통소음 예측식('99)에 대한 통계학적 평가 및 검증)

  • Cho, Il-Hyoung;SunWoo, Young;Lee, Nae-Hyun
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.28 no.11
    • /
    • pp.1198-1206
    • /
    • 2006
  • We have carried out highway traffic noise prediction and measurement for 10 sites with representative road shapes and structures. A road traffic noise prediction model(NIER('99)) has been developed for environmental impact assessment in Korea. With the fitted regression analysis, the distribution ratio($R^2$) and Pearson correction coefficient(r) was 92.4% and 0.96 in $1^{st}$ floor, 38.7% and 0.66 in $3^{rd}$ floor, 42% and 0.65 in $5^{th}$ floor, 7.5% and 0.27 in $7^{th}$ floor, 28.4% and 0.53 in 10th floor, 35.6% and 0.60 in $13^{th}$ floor, 52.7% and 0.73 in $15^{th}$ floor, respectively. The measured values of the noise level except the 1st floor did not show a good agreement with the predicted noise level in the NIER('99) formula. Also, the NIER('99) formula demonstrated that the measured values weren't reasonably close to the predicted values, indicating the validity and adequacy of the predicted models with the fitted vs residual analysis in the 95% of confidence interval and 95% of predict interval. Using the equal variation on the basis of the residual vs fitted value, there was the significant difference for variation between $3^{rd}$ floor and $15^{th}$ floor except $1^{st}$ floor. The results suggested that the NIER('99) model obtained by the results according to the apartment floor must be improved and developed on the road traffic noise.

IN VITRO COMPARISON OF VARIOUS DIAGNOSTIC METHODS OF OCCLUSAL CAR10US LESIONS (교합면 우식병소의 다양한 진단법에 관한 비교연구)

  • Kim, Jae-Gon;Kim, Young-Jin;Kim, Young-Sin;Baik, Byeong-Ju
    • Journal of the korean academy of Pediatric Dentistry
    • /
    • v.28 no.4
    • /
    • pp.613-619
    • /
    • 2001
  • The aims of this study were to compare the accuracy, sensitivity and specificity of cnventional visual examination, radiography and a new laser fluorescence method, KaVo Diagnodent, for the detection of occlusal caries lesions. One hundred sound human premolars and molars which had no restorations or interproximal cavities were tested by three methods. Tooth lesions depth was assessed at histologic examination using Caries detector dye The following results were obtained. 1. Diagnodent show 7.8 in sound tooth, 25.4 in initial caries, 30.5 in enamel caries, and 53.8 in dentin caries with average score 2. Spearman and Pearson relation coefficient was high between tooth-specimen test with dye and Diagnodent(0.736, 0.619), visual examination(0.664, 0.666), and was low between tooth-specimen test with dye and radiographic examination(P<0.01, total) 3. Accuracy of occlusal caries was highest on Diagnodent(65%) and lowest on radiographic examination(35%) 4. In initial caries, the sensitivity and specificity of Diagnodent method was the highest. In enamel caries, the sensitivity of visual examination was the highest and specificity of Diagnodent method was the highest. In dentinal caries, the sensitivity and specificity of Diagnodent method was the highest and sensitivity of visual examination was the lowest.

  • PDF

The Simple Regression Model of Gonial Angles : Comparison between Panoramic Radiographs and Lateral Cephalograms (Gonial Angle의 단순 회귀 모델: 파노라마 영상과 측모두부 영상간의 비교)

  • Park, Sung-Hee;Kim, Young-Jae;Lee, Sang-Hoon;Kim, Chong-Chul;Jang, Ki-Taeg
    • Journal of the korean academy of Pediatric Dentistry
    • /
    • v.44 no.2
    • /
    • pp.129-137
    • /
    • 2017
  • The aim of this study was to enhancing the panoramic radiograph's clinical use for assessing mandibular measurements and formulating a function of those measurements from panoramic radiographs and lateral cephalograms in children. The panoramic radiographs and lateral cephalograms of 99 former orthodontic patients with skeletal class III malocclusion were selected. In each radiograph, gonial angles, ramus heights, and distance between lower incisors and symphysis were measured. The values of the studied parameters were compared by paired t-test, Pearson's correlation test and regression analysis. The mean value of the gonial angle in panoramic radiographs was $125.49^{\circ}$, and the value in lateral cephalograms was $127.50^{\circ}$. The Pearson's correlation coefficient (${\rho}$) between mean values of gonial angle in each radiograph was 0.945 (p < 0.001). The relationship between the gonial angle measurements obtained from each radiographs was represented as 'Gonial angle (Lateral cephalograms) = 0.920 ${\times}$ Average gonial angle (Panoramic radiographs) + 12.072' in the linear function. The coefficients of ramus heights, and distance between lower incisors and symphysis portrayed weaker correlations than gonial angles. A panoramic radiograph could be used to determine the gonial angle as accurately as a lateral cephalogram, and each gonial angle showed a strong positive relation. A panoramic radiograph is a useful tool for examining vertical growth pattern of patients, as well as a lateral cephalogram.

Regression Model for Estimating Biomass of Natural Pinus densifrola Forests in Northeast Area of Mt. Paekdu (백두산 동북부지역 소나무 천연림 biomass 추정모델)

  • 김영환;이돈구;맹헌우
    • Journal of Korea Foresty Energy
    • /
    • v.17 no.1
    • /
    • pp.23-29
    • /
    • 1998
  • This study was carried out to develop the regression model for estimating biomass of natural Pinus densiflora forests by stand density in northeast Chinese area of Mt. Paekdu. Four allometric regression models(W=aD$^b$, W=a(D$^2$H)$^b$. logW=a+b$\cdot$ logD+cD and logW=a+b$\cdot$log(D$^2$H)+c(D$^2$H)) were used to estimate biomass for each of the tree components. The suitable regression model for estimating biomass of stem, bark and whole tree above ground was logW=a+b$\cdot$log(D$^2$H)+c(D$^2$H), and that for biomass of branch, needle and needle area, logW=a+b$\cdot$logD+cD for all of the stand density classes.

  • PDF

A study on How Korean Wave's characteristic effect on sponsorship (한류행사특성이 스폰서십에 미치는 영향 연구)

  • Bae, Seong-Woong;Park, Jeong-Bae
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.1
    • /
    • pp.70-77
    • /
    • 2015
  • With the purpose of studying the effects of K-wave event sponsorship on corporate image, surveys were conducted against visitors at K-wave marketing events in Tokyo and Nagoya which yielded 199 viable samples. These samples were subjected to descriptive and multivariate statistics analysis. Average and standard deviation were calculated and measured for total correlation coefficient to find out characterize of study variables. A Cronbach's alpha coefficient exceeding 0.7 indicated a good to excellent credibility of the measuring instrument. In addition, exploratory factor analysis was employed to establish validity of the measuring instrument. In order to determine the characteristics of K-wave events and the cause and relation of the subsequent effects on corporate image that stems from the aforementioned characteristics, 4 sub hypotheses were derived from 1 major hypothesis, of which 3 were determined to have a substantial and meaningful influence on the final outcome while 1 was rejected. However, due to lack of advance research, additional and continuous studies are warranted to establish a systemized theory in this field and further on, to observe such theories bear fruit in real world applications in the industry.