센서 데이터의 시간 정보를 이용한 이력 정보 관리

이양구,류근호,Lee, Yang-Koo,Ryu, Keun-Ho 한국공간정보학회 2008 한국공간정보시스템학회 논문지 Vol.10 No.4

무선 센서 네트워크는 공간상에 분포되어 거의 무제한적이고, 연속적으로 데이터를 발생시키며, 주로 샘플링이나 시놉시스 등을 이용하여 수집되는 데이터를 저장한다. 그러나 이러한 방법은 원시 데이터의 정확한 저장 및 장기간 수집된 이력 데이터로부터의 분석을 요구하는 응용환경에는 적합하지 않다. 따라서 이 논문에서는 센서로부터 수집된 데이터를 손실 없이 저장하는 동시에 시간에 따라 누적되는 센서 데이터의 이력을 효율적으로 관리할 수 있는 저장 기법을 제안한다. 제안된 방법에서는 센서의 측정값이 변경된 시점을 기준으로 동일한 값이 지속된 기간을 Time-segment와 Time- point로 저장한다. 이러한 방법은 센서의 모든 측정값을 정확하게 저장할 수 있고, 특정 시간에 걸쳐 중복되는 데이터들을 하나의 튜플에 저장하기 때문에 장기간 동안 수집된 데이터를 메모리에서 유지할 수 있다. A wireless sensor network consists of many sensors that collect and transmit physical or environmental conditions at different locations to a server continuously. Many researches mainly focus on processing continuous queries on real-time data stream. However, they do not concern the problem of storing the historical data, which is mandatory to the historical queries. In this paper, we propose two time-based storage methods to store the sensor data stream and reduce the managed tuples without any loss of information, which lead to the improvement of the accuracy of query results.

날씨 마케팅 적용을 위한 기후 데이터의 군집 분석

이양구,김원태,정영진,김광득,류근호,Lee, Yang-Koo,Kim, Won-Tae,Jung, Young-Jin,Kim, Kwang-Deuk,Ryu, Keun-Ho 한국공간정보시스템학회 2005 한국공간정보시스템학회 논문지 Vol.7 No.3

Recently, the weather has been influenced by the environmental pollution and the oil price has been risen because of the lack of resources. So, the weather and energy are influencing on not only enterprises or nations, but also individual daily life and economic activities very much. Because of these reasons, there are so many researches about management of solar radiation needed to develope solar energy as alternative energy. And many researchers are also interested in identifying the area according to changing characteristics of climate data. However, the researches have not developed how to apply the cluster analysis, retrieval and analytical results according to the characteristics of the area through data mining. In this paper, we design a data model of the data for storing and managing the climate data tested in twenty cities in the domestic area. And we provide the information according to the characteristics of the area after clustering the domestic climate data, using k-means clustering algorithm. And we suggest the way how to apply the department store and amusement park as an applied weather marketing. The proposed system is useful for constructing the database about the weather marketing and for providing the elements and analysis information. 최근 환경오염으로 인한 날씨의 변화, 자원 고갈에 따른 국제 유가의 상승 등 날씨 및 에너지 문제가 기업이나 국가 심지어 개인의 일상생활, 경제활동에 크나큰 영향을 미치고 있다. 이와 같은 이유로 대체에너지 중 태양 에너지 개발에 필요한 일사량 관리와 기후 데이터의 변화 특성 등을 근거로 지역성 규명에 관한 연구가 많이 이루어지고 있다. 그러나 아직까지는 데이터 마이닝을 이용한 지역적 특성에 따른 군집 및 체계적인 분석 데이터 검색 서비스가 효과적으로 제공되지 않고 있다. 따라서 이 논문에서는 국내에서 측정된 기후데이터를 저장 및 관리하기 위한 데이터를 모델링하고, k-means 기법을 이용하여 국내 기후 데이터를 지역적 특성에 따라 군집함으로써 체계적인 데이터 정보를 제공한다. 그리고 이러한 정보들이 날씨 마케팅에 어떻게 적용되는가에 대한 사례를 보인다. 제안 시스템은 기업의 날씨 마케팅 연구 및 이에 영향을 미치는 요소와 분석 정보를 제공할 수 있는 기본 데이터베이스 구축에 유용하게 활용될 것이다.

등숙 진전에 따른 도체내 부위별 양분 동태에 관한 연구 I. 도체내 부위별 무기양분의 동태

이양구,임무상,임병기,Lee, Yang-Ku,Lim, Moo-Sang,Im, Byeong-Gi 한국작물학회 1986 한국작물학회지 Vol.31 No.2

In order to clarify the trend of change in mineral nutrients in rice plant on various ripening process, P$_2$O$\sub$5/, K$_2$O, MgO, CaO, SiO$_2$ and ash contents were determined for the grain, internode, leaf-5heath and leaf blade respectively for 9 times at an week interval after heading. Four rice cultivars with different maturity and ecotype were grown under normal cultural conditions for the trial. The contents of mineral nutrients in the brown rice were in the order of Ash, P$_2$O$\sub$5/, K$_2$O and MgO. CaO and SiO$_2$ were found in minute quantity in the brown rice. The hull contained SiO$_2$ in large quantity, and it also contained the mineral nutrients in the order of K$_2$O, P$_2$ O$\sub$5/O. The CaO content of hull was extremely minute.

대학 교육서비스 환경과 학습동기 간의 상관관계 연구

이양구(Lee, Yang-Gu),김원현(Kim, Won-Hyun) 서원대학교 사범대학 부설 교육연구소 2021 교육발전 Vol.41 No.1

본 연구는 대학의 교육서비스 환경이 학생들의 학습동기에 영향을 미치는 주요 예측변인을 밝히는데 목적이 있다. 연구대상은 충북권 소재 대학에 소속된 재학생 339명이다. 대학의 교육서비스 환경이 학습동기에 미치는 영향을 분석하기 위한 다중회귀분석과 교육서비스 환경을 이용하는 수요자들의 만족도 선택 결정의 인식에 따른 하위 요인들과의 관계를 확인하기 위한 대응일치분석 방법을 사용하였다. 연구 결과, 대학의 교육서비스 환경과 학습동기 간에는 유의미한 상관이 있는 것으로 나타났고, 대학의 교육서비스 환경을 이용하는 학생들의 인식은 대부분 긍정적으로 작용하고 있지만 개선이 필요한 부분(발전적 사회인 양성의 신뢰감, 대학의 복지 시설 충족, 대학의 약속이행, 교직원의 용모, 공지된 학사일정의 진행) 역시 존재하는 것으로 나타났다. 대학 교육서비스의 전략적 운영과 수요자 중심의 맞춤형 프로그램 개발 및 교육 시스템 구축을 위한 지속적인 관심과 노력이 필요할 것으로 보인다. This study aims to reveal the major variables predicting the impact of university education service environment on students’ academic motivation. This study was conducted with 339 students enrolled in a university located in the Chungbuk area. The multiple regression analysis method was used to analyze the impact of the university education service environment on academic motivation, and the correspondence analysis method was used to check the relationships with sub-factors according to the satisfaction and perceptions of career selection and decision of the consumers who use the education service environment. The results of study are as follows. First, it turned out that there was a significant correlation between the university education service environment and academic motivation. Second, as for the perceptions of the students who were using the university education service environment, it acted positively, overall; however, there were also parts that would need improvements (Trust in nurturing developmental members of society, satisfaction of university welfare facilities, the fulfillment of the university’s promises, the faculty members’ appearance, and progress of the announced academic schedule).

대응일치분석을 이용한 중학교 학생운동선수 삶의 변화과정에 관한 연구

이양구(Yang Gu Lee),권형일(Hyung Il Kwon),손환(Hwan Son) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.52

The present study investigates the outcome of running the system for guaranteeing student athletes the right to learn when the deficiency of learning still exists despite national efforts with a view to shedding light on changes in life of student athletes. Study subjects were 355 middle-school student athletes in 3 regions around the capital area (Seoul, Incheon and Gyeonggi). To examine subjects` right to learn, learning attitudes and changes in their perception of friendly relations, χ2 test was conducted. Also, to analyze the correlations between regions, academic achievements and student athletes` perception depending on the time of engaging in sports, correspondence analysis was carried out. The findings of this study are as below: First, in terms of changes in the right to learn, student athletes` perception was found different depending on regions and the time of their engaging in sports. Second, regarding changes in learning attitudes, perception varied depending on regions, academic achievements and the time of engaging in sports. Third, concerning changes in friendly relations, perceptions differed depending on regions and the time of engaging in sports. Fourth, a significant correlation was found in the perception of guaranteeing the right to learn between regions. Fifth, a significant correlation was found between academic achievements and the perception of changes in learning attitude. Finally, a significant correlation was found between the time of engaging in sports and the perception of changes in friendly relations.

사범대 예비교사들의 학과 만족과 진로결정 효능감의 관계

이양구(Lee, Yang-Gu) 서원대학교 사범대학 부설 교육연구소 2020 교육발전 Vol.40 No.2

본 연구는 전공과 연계된 진로를 선택하는데 영향을 미치는 진로교육서비스 공급자인 사범대학이라는 환경적 요인의 학과 만족과 전공 관련 진로결정 효능감과의 관계를 밝히는데 목적이 있다. 연구대상은 교사를 목표로 하고 사범대학 소속 학과의 전공 수업을 수강하고 있는 예비교사 재학생 369명을 대상으로 하였다. 탐색적 요인분석과 요인 간 유사성을 알아보기 위해 상관계수를 적용하여 분석하였으며, 학과 만족에 따른 전공 관련 진로결정 효능감의 차이는 t-test, one-way ANOVA, Multiple Regression 모형을 사용하였다. 연구결과는 다음과 같다. 첫째, 학과 만족과 진로결정 효능감의 변수들 간의 상관관계는 유의한 정적 상관의 관계가 있는 것으로 나타났다. 둘째, 학과 만족과 전공 관련 진로결정 효능감은 성별에 따른 학과 만족에서만 유의한 차이가 있는 것으로 나타났다. 셋째, 학과 만족과 전공 관련 진로결정 효능감의 세부 요인별 간에는 각각 유의미한 상관이 있는 것으로 나타났다. This study aims to reveal the relationship between the department satisfaction of the environmental factor, the college of education, a career education service provider affecting the selection of a career related to a major and the major-related career decision efficacy. Research subjects were 369 pre-service teachers who aimed to be teachers and were taking major classes in the department in a college of education. Exploratory factor analysis and analysis applying a correlation coefficient to examine the similarity between factors were conducted, and for the difference in major-related career decision efficacy according to department satisfaction, a t-test, one-way ANOVA, and multiple regression model were used. The results obtained through the research results are as follows: First, as for the correlation between the variables of department satisfaction and career decision efficacy had a significant positive correlation. Second, there was a significant difference between department satisfaction and major-related career decision efficacy only in department satisfaction according to sex. Third, there was a significant correlation respectively between the sub-factors of department satisfaction and major-related career decision efficacy.

디지털 트윈 기반 공장 물류 관리 시스템

이양구(Yangkoo Lee),정우근(Wookeun Jeong),임영재(Youngjae Lim),윤대섭(Daesub Yoon) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.11

토요방과 후 체육활동 운영실태 및 활성화 방안

이양구(Lee, Yang-Gu),권민정(Kwon, Min-Jung) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.2

The purpose of this study is for making the afterschool sport activities to contribute to elementary school physical education in the future by analyzing the perception of students of the elementary school physical activities programs in afterschool and its effect obtained by joining it. As of April of 2012, the survey has been done for 3’17 elementary school students(the 5th~6th year students) from 16 cities and provinces/except Cheju island) and the average, standard deviation, multivariate analysis of variance(MONOVA) and X² test has been calculated out for its analysis of materials. First, as its result, most of those students have shown the positive perception for the weekend elementary school physical activities program. Second, from the survey all regions, there was a significant difference only between different genders in the perception of effect obtained by joining the weekend elementary school physical activities programs. Third, as for the sub factor of effect obtained by joining, ‘the promotion of school study grade’ and ‘the promoted physical health’ showed their most significant influence respectively on gender and age. Fourth, as for the difference of level of school record, there was little difference in every factor. Fifth, most of students revealed the positive perception for their intention of continuous joining in the future.

학교생활체육 분야 게이트볼 활성화를 위한 심판의 공정성 인식 및 직무만족도 탐색

이양구(Yang Gu Lee),김영재(Young Jae Kim),차은주(Eun Joo Cha) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.54

This study aims to find a realistic plan for the improvements of a variety of recognition of the fairness of gate ball referees` decisions and training of the referees as the pr oliferation of gate ball games, social interests demanding changes in exercise culture and the efforts of the Korea Gate Ball Union of Sport For All are increasing. Research subjects were 72 Classes 1 and 2 referees who belonged to the Korea Gate Ball Union of Sport For All in 17 cities and provinces nationwide. To verify the differences in each question depending on the demographic characteristics of the research subjects, a t-test, a One-Way ANOVA and a χ2(chi-square) test were carried out, and for significance test, the method of Scheffe test was used. The findings obtained through research are as follows: First, it turned out that the fairness of the gate ball referees` decisions differed depending on the number of activities and their career as referees, and since the respondents recognized that the qualifications of the referees were the biggest barrier in their decisions, it turned out that it was most important to enhance morality to increase the fairness. Second, it turned out that the gate ball referees` job satisfaction differed depending only on their qualifications, the number of activities and career while it turned out that their job satisfaction had significant impacts on the fairness of their decisions. Third, they responded that the appropriateness of the period of the training of gate ball referees was ‘average,’ but they recognized that developing fair referees would be possible through the training of the referees and had a concern that the referees` fair decisions might be difficult if newly appointed referees entered immediately after the training.

생활체육 참여 여성의 운동중독성향과 스포츠재미 및 운동몰입과의 관계

이양구(Yang-Gu Lee) 한국여성체육학회 2016 한국여성체육학회지 Vol.30 No.2