• 건강소식
• /
• v.38 no.2
• /
• pp.8-9
• /
• 2014

우리나라가 '전국 단위 암 발생 통계'를 산출하기 시작한 것은 지난 1999년부터다. 그 이후부터 매년 암 발생률은 꾸준히 증가를 거듭해 현재 우리나라 국민의 주요 사망 원인 1위 자리를 지키고 있다.

• School Mathematics
• /
• v.12 no.3
• /
• pp.301-322
• /
• 2010

In this study, researchers developed the criteria evaluating mathematically gifted students' creative products, which contain such evaluation headings as cognitive abilities(; creativity, analytic thinking, expert skill and knowledge), performing ability of the Mathematically Gifted-Creative Problem Solving process. And then a case study is carried out to apply the criteria to an actual condition of mathematically gifted education. This case study shows that how teachers can apply those of model and criteria in actual condition of the mathematically gifted education. Through the criteria above mentioned, the characteristics of creative productivity can be grasped clearly and evaluated in detail.

• Journal of Korean Society of Transportation
• /
• v.19 no.6
• /
• pp.89-102
• /
• 2001

Using a multiproduct translog cost function model, this paper examines the existence or absence of scale and scope economies in Seoul's urban bus industry. The Paper then conceptualizes that the bus firm produces three outputs (city, seat and local bus-kilometers) using low input factors(labor, capital, fuel and maintenance). Using 1996 annual observations for 81 Seoul's bus firms, the equation system consisting of a cost function and three input share equations is estimated with the nonlinear iterative Zellner method. The findings show that the cost function corresponding to a non-homothetic production technology with separability between local bus outputs and inputs adequately represents the structure of cost for Seoul's bus firms, and that the demand lot all input factors is quite inelastic with respect to their own price. On the other hand, nearly all firms experience mild overall economies or scale, but rather marked product-specific economies of scale with respect to all the three outputs. In addition, there appear to be substantial economies or scope associated with the joint production of city and seat bus services, while considerable diseconomies of scope associated with that of city and local bus services. These results indicate that the merger of smaller firms into larger firms with a fleet of approximately 200 buses would result in more cost-efficient bus services.

• Phonetics and Speech Sciences
• /
• v.11 no.3
• /
• pp.57-67
• /
• 2019

This study aimed to investigate regional differences in the development of speech production in Korean children. A total of 619 children aged 2 to 7 years from the Jeolla, Seoul/Gyeonggi, Chungcheong, and Gyeongsang areas were included in this study. The subjects were assessed with the UTAP2 word-level test. In PWC, PMLU, and PWP, the performance was significantly lower in Gyeongsang at 2 years 11 months and in Jeolla and Chungcheong at 3 years 5 months than in Seoul/Gyeonggi. The total PCC of Gyeongsang and Chungcheong and UTAP PCC of Chungcheong were significantly lower at 2 years 11 months compared with those of Seoul/Gyeonggi, while Jeolla and Chungcheong showed significantly lower total PCC and UTAP PCC than Seoul/Gyeonggi at 3 years 5 months. However, no regional difference was observed in any indicators after the age of 3 years 6 months. These results suggest that there are regional differences in the ability to produce speech sounds at a very young age, and that the differences can be explained by the differences between Seoul/Gyeonggi and the other provinces rather than by the individual characteristics of specific regions.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.9 no.2
• /
• pp.33-40
• /
• 2010

In this paper, we consider three macroscopic traffic flow monitoring indices, Travel Time Index(TTI), Acceleration Noise(AN) and Two Fluid(TF) and investigate how to determine a proper rate of probe cars for producing reliable values of these indices. For the analysis, we use classical sampling theories and provide numbers of probe rates using simulation data.

• The Journal of Engineering Geology
• /
• v.6 no.1
• /
• pp.33-43
• /
• 1996

In this study, hypocentor parameters of some local and regional earthquakes and explosions, including focal depth and origin time, were redetermined by using a single station of three-component. We attempt to do the job by the combination of polarization analyses, by which azimuths and trial epicenters of earthquakes can be figured out, and a layered constant velocity model, on the basis of which theoretical travel times can be computed to match a series of input seismic phases of the event. Magnitudes were determined by using coda duration. Results, which correspond to the least misfit, showed that the average focal depth of all earthquakes in this study is around 15km, which fits well to that by investigation (Kang and Choi, 1993).

• Electronics and Telecommunications Trends
• /
• v.14 no.3 s.57
• /
• pp.95-105
• /
• 1999

일반적으로 정보화 수준을 측정할 때 많이 사용되는 방법은 산술평균의 개념에 의한 대표값 산출방식이다. 그러나 이는 항목간의 통합문제의 관점에서 각 항목의 정보화 기여도가 무시되고, 급격한 정보화의 구조변화를 적절히 반영하지 못하며, 기본지표의 측정항목이 많아질 경우에는 해당 측정항목이 상대적으로 작은 기여도를 갖는 것으로 나타나는 등 여러 문제점을 내포하고 있다. 따라서 본 연구는 이와 같은 문제점을 해결하기 위하여 새로운 정보화 수준 측정방법을 제안하고 이에 따른 정보화지수의 측정.비교.분석을 통하여 새로운 측정방법을 검증하는 데에 있다. 본 고에서는 서로 상관된 국가정보화 지표들을 결합하여 하나의 가중치를 구하는 인자분석 및 대표성분점수화법 등 세 가지 방법을 이용하여 방법별로 정보화지수를 산출한 결과를 비교.분석하여 보았다. 세 가지 방법들에 의한 가중치 및 지수는 다소 값의 차이를 보이고 있지만 전체적인 추이는 같음을 보았다. 방법 1과 방법 2는 요인분석에 의한 분석 결과로서 가중치나 지수에서 다소의 차이를 보이고 있지만 유사성이 매우 크며, 방법 3에 의한 분석결과는 앞의 방법들과는 가중치 및 지수에서 차이를 보이고 있다. 특히 방법 3은 다른 측정 방법과는 달리 상관성이 높은 변수들에게 가중치를 부여하게 된다. 따라서 방법 1과 방법 2보다 더 객관적으로 각 지표의 가중치를 반영한다고 볼 수 있어 어느 정도 이 방법에 의한 분석이 유의함을 보여주었다.

• Korean Journal of Remote Sensing
• /
• v.20 no.2
• /
• pp.65-76
• /
• 2004

This study aims to estimate daily maximum air temperature estimated using satellite-derived surface temperature and Elevation Derivative Database (EDD). The analysis is focused on the establishment of a semi-empirical estimation technique of daily maximum air temperature through the multiple regression analysis. This tests the contribution of EDD in the air temperature estimation when it is added into regression model as an independent variable. The better correlation is shown with the EDD data as compared with the correlation without this data set. In order to provide a progressive estimation technique, we propose and compare three approaches: 1) seasonal estimation non-considering landcover, 2) seasonal estimation considering landcover, and 3) estimation according to landcover type and non-considering season. The last method shows the best fit with the root-mean-square error between 0.56$^{\circ}C$ and 3.14$^{\circ}C$. A cross-validation procedure is performed for third method to valid the estimated values for two major landcover types (cropland and forest). For both landcover types, the validation results show reasonable agreement with estimation results. Therefore it is considered that the estimation technique proposed may be applicable to most parts of South Korea.

• Korean Journal of Remote Sensing
• /
• v.32 no.6
• /
• pp.589-601
• /
• 2016

Sea surface currents were estimated by applying the Maximum Cross Correlation (MCC), Zero-mean Sum of Absolute Distances (ZSAD), and Zero-mean Sum of Squared Distances (ZSSD) algorithms to Himawari-8/Advanced Himawari Imager (AHI) thermal infrared channel data, and the comparative analysis was performed between the results of these algorithms. The sea surface currents of the Kuroshio Current region that were retrieved using each algorithm showed similar results. The ratio of errors to the total number of estimated surface current vectors had little difference according to the algorithms, and the time required for sea surface current calculation was reduced by 24% and 18%, relative to the MCC algorithm, for the ZSAD and ZSSD algorithms, respectively. The estimated surface currents were validated against those from satellite-tracked surface drifter and altimeter data, and the accuracy evaluation of these algorithms showed results within similar ranges. In addition, the accuracy was affected by the magnitude of brightness temperature gradients and the time interval between satellite image data.

• The Journal of Korean Association of Computer Education
• /
• v.20 no.2
• /
• pp.1-11
• /
• 2017

The demands of computer science education for non-majors in higher education is increasing but relevant evaluation tools for the students' computational artifacts are lack. This research aims to develop a scoring rubric to assess student's computational artifacts in non-major programming course at Computational Thinking point of view. The rubric was developed based on 'CT Practice Design Pattern' as a framework. The rubric consists of 'domain, skills, evaluation, evaluating resources, and scales'. Domains are 'Design of abstract model', 'Design and application of creative artifacts', and 'Analysis of the artifacts'. Experts reviewed the rubric to ensure contents validity. The rubric is resulted in reliable for consistency. This rubric can be revised and applied to application environment accordingly.