• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.283-284
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• 2006

In this paper 3-point weighing method is adopted to measure the unbalance moment of small-sized precision spinning elements using electronic scales with 0.1 mgf resolution. Firstly methods to eliminate the fixture error and to reduce the effects of frictional force that is known as side effect, are proposed. A measuring system is developed and various experiments are performed to verify the proposed approach. The measured and calculated values are analysed in statistical methods, and this provides the errors of the measuring system. The results show that the proposed theory and test procedures gives reliable unbalance moments and gravitational centers.

• 한국생산제조학회지
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• 제7권3호
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• pp.51-51
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• 1998

It is very important to test linear cycle positioning accuracy of Machining centers as it affect all other machines machined by them in industries. For example, if the linear positioning accuracy of each axes directions is bad, the size of works will be wrong and the change-ability will be bad in the assembly of machine parts. In this paper, measuring systems are organized to measure linear displacements of table or spindle of machine center using laser interferometer, magnescale and tick pulses comming out from computer in order to get data at constant time intervals from the sensors. And each set of data gotten from test is expressed to a plots by computer treatment and the results of linear positioning error motion is estimated to numerics by statistical treatments.

• 대한가정학회지
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• 제43권5호
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• pp.221-234
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• 2005

This study investigated the emotional inferences depending on the children's age, character's personality traits, and emotional situations. One hundred three subjects (34 3-year-olds, 33 5-year-olds and 36 7-year-olds) were recruited from 3 daycare centers and 1 elementary school. Eight stories, consisting of four personality traits (positive-'active','helpful', negative-'selfish','mean') and two emotional situations (equivocal and unequivocal situation), were presented with three pictures each. The statistical methods adopted for the data analysis were repeated measure ANOVA, and paired t-test. The results showed that the 3-year-olds showed lower scores of emotional inferences than the 5- and 7-year-olds. However, there were no significant differences between the 5- and 7-year-olds. Children showed more personal inferential responses in the negative personality trait and equivocal situation.

• 아동학회지
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• 제26권1호
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• pp.15-29
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• 2005

This study investigated 2- and 3-year-olds' story comprehension by story structure, Sixty-eight children from day-care centers in Seoul and Kyunggi province were tested story comprehension about causal, noncausal, discontinuous story presented by pictures. Story comprehension included literal, inferential, & empathic comprehension, Data were analysed by ANOVA(repeated measure) and t-test. The result showed that 3-year-olds scored higher in literal and inferential comprehension than 2-year-olds. Children's story comprehension(literal, inferential, & empathic) scores were higher in causal structure than discontinuous and noncausal structure.

• 산업경영시스템학회지
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• 제22권51호
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• pp.29-40
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• 1999

The distribution center location and routing problem involves interdependent decisions among facility, transportation, and inventory decisions. The design of distribution system affects the customers' purchase decision by sets the level of customer service to be offered. Thus the lower product availability may cause a loss of demand as falls off the customers' purchase intention, and this is related to the firm's profit reduction. This study considers the product availability of the distribution centers as the measure of the demand level change of the demand points, and represents relation between customer service and demand level with linear demand function. And this study represents the distribution center location and routing to demand point in order to maximize the total profit that considers the products' sales revenue by customer service, the production cost and the distribution system related costs.

• 아동학회지
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• 제17권2호
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• pp.181-193
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• 1996

The purpose of this study was: (1) to examine relationships between social development and day care quality, child-care experience and family characteristics, and (2) to investigate the explainability of those related variables for social development. Subjects for this study were 252 4-year-old children and their mothers from 32 day care centers in Seoul. Harms & Clifford's Early Childhood Environment Rating Scale was used to measure the quality of day care. The main results were as follows: (1) Day care quality, child-care experience and family characteristics were significantly related to social development. (2) Child's gender, months of age, mother's child rearing attitude, the length of child-care experience, overall quality of day care, and group size significantly predicted social development. 33％ of the variance of social development was explained by these variables. The relative influence of these variables to the prediction of social development was about the same.

• Journal of Information Processing Systems
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• 제19권6호
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• pp.778-790
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• 2023

Although density peak clustering can often easily yield excellent results, there is still room for improvement when dealing with complex, high-dimensional datasets. One of the main limitations of this algorithm is its reliance on geometric distance as the sole similarity measurement. To address this limitation, we draw inspiration from the information bottleneck theory, and propose a novel density peak clustering algorithm that incorporates this theory as a similarity measure. Specifically, our algorithm utilizes the joint probability distribution between data objects and feature information, and employs the loss of mutual information as the measurement standard. This approach not only eliminates the potential for subjective error in selecting similarity method, but also enhances performance on datasets with multiple centers and high dimensionality. To evaluate the effectiveness of our algorithm, we conducted experiments using ten carefully selected datasets and compared the results with three other algorithms. The experimental results demonstrate that our information bottleneck-based density peaks clustering (IBDPC) algorithm consistently achieves high levels of accuracy, highlighting its potential as a valuable tool for data clustering tasks.

• 한국전자파학회논문지
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• 제24권3호
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• pp.292-298
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• 2013

본 논문에서는 미사일의 길이를 추정하는 신호 처리 기법의 개발에 관하여 소개한다. 표적의 길이를 추정하기 위해서는 미사일의 위치 및 표적과 레이더와의 각도 정보가 필요하다. 미사일의 위치 및 각도를 알아내기 위해서 chirp 파형을 사용했고, 레이더 영상 신호인 HRRP(High Resolution Range Profile)를 발생시키기 위해 stretch processing을 이용하였다. HRRP로부터 표적의 산란점(scattering center)을 찾기 위해 스펙트럼 추정 방법(spectral estimation technique)인 Relaxation(RELAX) 알고리즘을 이용하였다. 이 알고리즘으로부터 얻은 1차원 산란점의 정보를 이용하여 미사일의 길이를 추정하였다.

• 정보관리학회지
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• 제31권1호
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• pp.7-29
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• 2014

본 연구의 목적은 어린이 독서프로그램의 효과를 측정할 수 있는 성과 측정 도구를 개발하는 것이다. 먼저, 어린이 독서프로그램 효과를 고찰하고 성과측정 도구 적용 사례를 분석하여 도서관 어린이 독서프로그램의 기능 및 효과를 조사하였다. 측정 대상인 독립 변인, 종속 변인, 통제 변인에 대한 개념을 도출하고 각각의 내용을 제시하였으며 국내외 독서 성과 측정 도구의 사례를 분석하여 시사점을 도출하였다. 또한 어린이의 독서 성과 영역과 척도를 조사 분석하였으며 독립 변인과 종속 변인, 통제 변인에 관한 척도를 세분화하고 성과 측정 도구로 활용될 설문지를 개발하였다. 그리고 '2013 도서관과 함께 책읽기' 사업에 참여하고 있는 공공도서관 중 지방권역별로 10개관을 선정하여 조사 대상 도서관의 프로그램에 참여 어린이를 대상으로 프로그램 초반과 후반에 설문지로 개발된 성과 측정 도구를 적용하였다. 또한 조사대상 도서관의 프로그램 담당 사서, 기관 담당자와 강사를 대상으로 설문을 실시하였다. 이상과 같이 수집된 데이터를 모두 분석하여 독서프로그램의 성과를 측정하고 분석하였으며 측정 도구의 개선 방안을 제안하였다.

• 한국보육지원학회지
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• 제16권4호
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• pp.73-92
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• 2020

Objective: The purpose of this study is to examine occupational safety accidents of child care teacher and to suggest preventive measure in occupational safety health and safety for child-care teacher. Methods: We investigated laws, policy, and previous studies related occupational safety and health for child care teacher. Especially, we reviewed the legal definition of child-care teacher to identify whether Occupational Safety and Health acts cover child-care teacher. Also cross tabulation and a qualitative analysis were conducted for occupational accidents in child care centers from 2013-2018. Results: Safety and health related policies to protect child care centers have been carried out by child care Center Safety and Insurance Association and the Child Care Support Center, but it has mainly been functioned to protect children excluding child care teacher. The most occupational accidents occur in worker aged 40s. The most type of occupational accident were falling down on the floor and surface. Also we could find that there is a high risk of falls, and musculoskeletal disorders through qualitative analysis on occupational accidents cases of child-care teacher. Conclusion/Implications: We suggest to improve the system for protecting child care workers including strengthening occupational safety and health education for child care workers, expanding coverage of national project to prevent occupational accidents.