• 한국학교수학회논문집
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• 제17권2호
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• pp.167-191
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• 2014

본 연구는 초등수학에서 '밑'의 용어집합인 '밑변'과 '밑면'에 대한 고찰에서부터 입체도형의 '밑넓이' 개념과 그것을 구하는 과정에 대한 물음에서부터 출발한다. 곧, 연구는 초등학교 6학년 수학에서 직육면체의 밑넓이를 구하라는 문제에서 출발한다. 이에 대한 일차적인 답은 초등수학에서는 밑넓이라는 용어를 사용하지 않는다는 데서 찾을 수 있다. 그러나 중학교 1학년 수학에서 밑넓이를 '한 밑면의 넓이'로 사용하고 있는데, 문제는 초등수학에서 중학교 수학으로의 이행에서 이에 대한 설명이 없다는데 있다. 또한 초등수학에서 밑면을 정의하고, 겉넓이와 옆넓이를 다루는데, 이로부터 자연스럽게 밑넓이를 구하는 문제를 생각해볼 수 있다는데 있다. 이에 본 연구는 '밑'의 용어집합에서 그 원소인 '밑변'과 '밑면'을 검토해보고, 다음으로 밑넓이에 대한 논의를 교육과정, 교과서를 비롯하여 사전적 정의와 함께 살펴보았다. 또한 입체도형 관련 설문 문항을 작성하여 예비교사와 현장교사를 대상으로 설문을 실시하여 밑면과 밑넓이에 대한 이해 정도를 비교 분석하였다. 특히 처음과 마지막 문항에 밑넓이를 구하는 문제를 제시하여, 이 사이에서 어떤 변화가 나타나는지를 비교하였다. 그 결과 초등수학과 중학교 수학 사이의 '인지적 간극'(cognitive gap)을 확인할 수 있었으며, 이를 통해 입체도형에서 밑넓이 지도를 위한 제언과 함께 이후 도형에서의 용어 지도를 위한 후속 과제를 제안하고 있다.

• Journal of Positioning, Navigation, and Timing
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• 제8권4호
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• pp.183-192
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• 2019

In fingerprint-based wireless positioning, it is necessary to establish a DB of the unmeasured area. To this end, a method of estimating the position of a base station based on a signal propagation model, and a method of estimating the information of the received signal in the unmeasured area based on the estimated position of the base station have been investigating. The purpose of this paper is to estimate the position of the base station using the measured information and to analyze the performance of the positioning. Vehicles equipped with a GPS receiver and signal measuring equipment travel the service area and acquire location-based Reference Signal Received Power (RSRP) measurements. We propose a method of estimating the position of the base station using the measured information. And the performance of the proposed method is analyzed on a simulation basis. The simulation results confirm that the accuracy of the positioning is affected by the measured area and the Dilution of Precision (DOP), the accuracy of the position information obtained by the GPS receiver, and the errors of the signal included in the RSRP. Based on the results of this paper, we can expect that the position of the base station can be estimated and the DB of the unmeasured area can be constructed based on the estimated position of the base stations and the signal propagation model.

• 환경생물
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• 제38권1호
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• pp.137-145
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• 2020

The sectioned-body morphometric characteristics of the diploid and triploid marine medaka, Oryzias dancena, of both sexes were examined to collect basic data on the significant differences between the diploid and triploid fish. Significant differences between the diploid and triploid fish in both sexes were observed in the body circumference anterior to the base of the pelvic fin, the body circumference anterior to the base of the anal fin, the body circumference anterior to the base of the dorsal fin, the area anterior to the base of the pelvic fin, the area anterior to the base of the anal fin, the area anterior to the base of the dorsal fin, the total height anterior to the base of the pelvic fin, the total height anterior to the base of the anal fin, the height anterior to the base of the pelvic fin, the height anterior to the base of the anal fin, the width anterior to the base of the anal fin, the belly thickness II anterior to the base of the anal fin, section shape 2-1, and section shape 4-1 (p<0.05). These measurements were greater in the triploid marine medaka of both sexes than those in the diploid marine medaka of both sexes, and they were also greater in the male diploid and triploid marine medaka than those in the corresponding female fish. Therefore, the sectioned-body morphometric dimensions were greater in the triploid males than those in the triploid females and the diploid fish in this study.

• 교육시설
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• 제16권4호
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• pp.71-78
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• 2009

After the introduction of the 7th revision of curriculum, educational facilities have been requested to change to face new curriculums and have been planned. But, it is actual condition that researches of curriculum and facilities seem to be insufficient. This research will re-establish in an angle of space-syntax based on existed research for home-base area of variation type in high school according to the 7th curriculum. And the each specific character of home-base area representing each type and strong / weak points of area structure of each home-base will be analyzed. And analysis result with the model of variation type in high school visit the on-the-spot inspection result which leads and comparison and with his interview back it leads and currently there is the objective to the evaluation the variation type in high school home-base which is planned regarding the suitable in real use. Each case to the school I visited the scene, not all high schools applied the 7th curriculum courses. Therefore, it is also home-base space capabilities were not being properly utilize. According to 7th curriculum, one of Hall-type home-base and Room-type home-base can be suitable when integration is higher. However, the way the current operational training, it is the best that Distributed-type home-base needs to be included in each curriculum block.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.340-343
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• 2007

In this paper, we present our method to reduce vibration of the base plate of a refrigerator by avoiding resonance between base plate and compressor operation. To verify the modes of the base plate, FE models of the base plate with free-free condition and applied boundary condition were built and validated by results from experimental modal analysis. Operating Deflection Shape analysis was applied to find the sensitive area on the base plate during compressor operation. In optimization process, Finite Difference Method - based sensitivity analysis is used to detect the most sensitive area. Finally, based on this numerical result, we will make beads on the base plate to reduce vibration of refrigerator.

• 대한치과보철학회지
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• 제34권3호
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• pp.611-619
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• 1996

The purpose of this study was to evaluate the fitness of 4 kinds of resin record base materials. The record base materials used on the edentulous cast in this study were Triad VLC resin (Dentsply International Inc., U.S.A.), custom tray resin (Kerr Ltd., U.S.A.), heat-cure resin (Dentimex Co., Holland), and self-cure resin (Dentimex Co., Holland). The gap width between record base and cast were measured in the ridge crest and midpalatal area with microhardness tester. The results obtained were as follows : 1. Among the 4 kinds of record base, heat-cure Vertex fitted best on the cast. Triad and Fomatray fitted better than self-cure Vertex. Self-cure Vertex had the poorest fit. 2. The quality of the fit of the record base varied at different locations on the cast. The record base fit better in the ridge crest than midpalatal area. 3. In the midpalatal area, there's no significant difference in the fit of Fomatray, Triad and heat-cure Vertex. They all fit better than self-cure Vertex. 4. In the ridge crest, heat-cure Vertex fit better than any other record base.

• 한국의류학회지
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• 제27권2호
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• pp.270-276
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• 2003

Methodology was suggested to analyze breast volume, base area of breast bulk. and surface area of breast using the 3D measurement system. Thirty-seven middle-aged (30s-40s) women wearing 80A brassiere were participated in this study. Image of the upper body was captured by Phase-shifting moire. The posture of the subject was adjusted to get the full image of the right breast. Rapidform 2001 was used for the analysis of the images. The mean breast volume was 547.0㎤ and mean base area of breast bulk was 235. I$\textrm{cm}^2$ It was also found that the volume(r=0.169) and surface area of breast(r=10.242) were loosely correlated with the circumference difference between top and under breast. Therefore, it is noted that current selection criterion of cup size based on the difference in the two kinds of breast circumference is inadequate. The result of this study is expected to contribute to the design of ergonomic brassiere as well as surgical operations in the medical field.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.807-810
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• 2003

This research uses high-resolution satellite images as a source of collecting farmland information. For effectively extract the paddy area, we use texture information and different classify methods to assist the satellite image classification. First, using maximum likelihood classifier to extract paddy information from images. The results show that User Accuracy and Procedure Accuracy of the paddy area can increase from 80.60% to 95.45% and 84.38% to 95.45%. Second, establishing a paddy Knowledge Base and using Knowledge Base Classifier to extract paddy area, and result shows the User Accuracy and Producer Accuracy to be 92.16% and 90.06%. Finally, The result shows we can effectively contribute to the paddy field information extraction from high-resolution satellite images.

• Journal of Positioning, Navigation, and Timing
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• 제10권3호
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• pp.207-214
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• 2021

A new positioning technique for positioning of LTE base stations is proposed. The positioning information of the base station is absolutely necessary for model-based wireless positioning, and is required in some of the various merhodologies for estimating signals in an uncorrected area when construnting a database for fingerprinting-based positioning. Using the acquired location-based Reference Signal Received Power (RSRP) information to estimate the location of the base station, it is impossible with the existing trilateration methods. Therefore, in this paper, a method using reference particles is proposed. Particles are randomly generated in the application area, and signal propagation modeling is performed assuming that a base station is located in each particle. Based on this, the errors of measurements are calculated. The particle group with the minimum measurement errors is selected, the position of the base station is estimated through weighted summation, and the signal propagation model of the corresponding base station is built at the same time. The performance of the proposed technology is verified using data acquired in Seocho-dong, Seoul.

• 한국항해항만학회지
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• 제30권3호
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• pp.253-258
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• 2006

본 논문에서는 해양레저를 즐길 수 있는 천혜의 자연조건을 가진 서남권 다도해 해역의 해양레저 기반여건 분석에 관하여 논의한다. 먼저 국내 해양 레저와 요트 산업의 현황과 문제점에 대하여 분석하고 개선 방안을 제시한다. 특히 환경 친화형의 마리나 시설을 서남권 다도해 해역에 적용하여 그 타당성을 분석한다.