• 한국전자파학회논문지
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• 제25권1호
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• pp.32-38
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• 2014

본 논문에서는 위성 데이터 통신을 위해 격벽 구조형 원형 편파기와 결합된 넓은 빔 폭을 갖는 시컨트 패턴 안테나를 설계하였다. 방사 패턴을 형성하기 위하여 전류 분포와 공간인자 사이의 푸리에 변환 관계를 이용하였고, 원형 대칭인 개구 형태를 이용하여 설계를 용이하게 하였다. 설계한 방사체를 격벽 구조형 원형 편파기와 결합하여 최적화 과정을 수행하였으며, 설계된 방사 패턴, 축비, 반사 손실 특성이 안테나의 목표 성능에 적합함을 확인하였다.

• 대한전자공학회논문지TC
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• 제40권10호
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• pp.150-158
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• 2003

라인 소스에 의한 빔 패턴 합성 문제에서 소스 분포함수와 빔 패턴간의 관계는 푸리에 변환쌍으로 표현 될 수 있다. 본 연구에서는 원하는 lobe형 빔 패턴을 만족시키는 라인 소스 분포함수를 반복 샘플링을 통한 비선형 역변환법을 사용하여 합성하는 일반적인 방법을 제안한다. 이 방법은 유전 매질에 TE 및 TM 평면파 입사시 원하는 역산란 반사계수를 갖도록 하는 연속적으로 분포된 유전율 합성에 적용될 수 있으며, 임의 반사계수를 갖는 전송선로 합성에도 적용될 수 있는 장점을 가진다. 대역저지 공간 필터 및 분산 특성을 갖는 전송선로 필터에 적용, 분석하므로서 제안한 방법의 타당성을 보인다.

• KEPCO Journal on Electric Power and Energy
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• 제2권1호
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• pp.61-69
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• 2016

Understanding load patterns and customer classification is a basic step in analyzing the behavior of electricity consumers. To achieve that, there have been many researches about clustering customers' daily load data. Nowadays, the deployment of advanced metering infrastructure (AMI) and big-data technologies make it easier to study customers' load data. In this paper, we study load clustering from the view point of yearly and daily load pattern. We compare four clustering methods; K-means clustering, hierarchical clustering (average & Ward's method) and DBSCAN (Density-Based Spatial Clustering of Applications with Noise). We also discuss the relationship between clustering results and Korean Standard Industrial Classification that is one of possible labels for customers' load data. We find that hierarchical clustering with Ward's method is suitable for clustering load data and KSIC can be well characterized by daily load pattern, but not quite well by yearly load pattern.

• 한방비만학회지
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• 제11권2호
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• pp.15-24
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• 2011

Objectives: The aim of the study was to investigate the relationship between oriental obesity pattern, life habitual factors(eating attitude, physical activity) and psychological factors(depression, stress, self-esteem) in korean obese and overweight women. Methods: This study was performed in obese and overweight(BMI ${\geq}$ 23 kg/$m^2$) women in Korea (n=56). Simple anthropometry including weight, BMI, waist circumference, BIA(bioelectrical impedance analysis) were done. To assess psychological factors, the Rosenberg self-esteem scale (SES) questionnaire, Beck depression inventory (BDI) questionnaire and stress response inventory (SRI) questionnaire were administered. Regarding diet, Korean eating attitude test(KEAT-26) was done. International physical activity questionnaire(IPAQ) was administered for exercise and physical activity intensity and quantities. All values were verified using correlation analysis. Results: 1. The subjects had stagnation of the liver qi>food accumulation>yang deficiency>blood stasis>spleen vacuity in the order. 2. Stagnation of the liver qi score had significant relationships with self-esteem(r=-0.520, p<0.05) and depression(r=0.688, p<0.01) in stagnation of the liver qi group. There was a relationship between food accumulation score and eating attitude(r=0.784, p<0.01) in food accumulation group. 3. Lean mass had a significant relationship with self-esteem(r=0.434, p<0.05) fat mass had a significant relationship with stress (r=0.633, p<0.01) and in stagnation of the liver qi group. 4. Physical activity had significant relationships with lean mass(r=0.628, p<0.01) and with fat mass(r=-0.478, p<0.05) in group. Conclusions: This study maintained that psychological factors play major roles in obesity with symptoms of stagnation of the liver qi and life habit(dietary factors and physical activity) in food accumulation.

• 정보처리학회논문지D
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• 제11D권1호
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• pp.143-152
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• 2004

최근에 객체지향 소프트웨어를 설계하거나 구현방법으로 EJB 기반의 소프트웨어 개발이 많이 이용되고 있다. 일반적으로 EJB 기반 어플리케이션에서는 데이터베이스를 이용한 영속적인 데이터를 사용하는 경우가 대부분이다. 본 논문에서는 서버 측 작성 프로그램 중 엔티티빈 클래스에서 담당하는 데이터베이스 엑세스에 관련된 부분을 J2EE의 DAO 패턴을 이용하여 클래스를 각각 분리하였다. 이는 기존의 패턴 방법과는 큰 차이는 없으나, 동일 패턴내의 공통의 클래스들을 합성이 가능하도록 설계하였다. 그리고 생성된 각각의 DBMS 클래스들은 다른 엔티티빈 클래스에서도 사용이 가능하게 할 뿐만 아니라 여러 DBMS 환경에서도 Data Source를 추가적인 프로그램의 변경이나 작성 없이 연동이 가능하도록 하고 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.952-954
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• 2003

In this paper, we present the different characteristics of NDVI fluctuation pattern between irrigated and non-irrigated area in Suphanburi province, in Central Thailand. For non-irrigated rice cultivation area, there is a strong correlation between NDVI fluctuation and peak rainfall, while there is a lower correlation with irrigated area. In this study, the 'peak detector' classifier was developed to identify the area of non-irrigated and irrigated cropping and its cropping intensity (number of crops per year). This classifier was created based on cropping characteristics such as number of crops, time or planting period of each crop and its relationship with the peak of rainfall. The classified result showed good accuracy in identification irrigated and nonirrigated rice cultivation areas.

• 한국산업융합학회 논문집
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• 제26권3호
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• pp.433-442
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• 2023

The purpose of this study is to reveal the Korean learners' usage pattern of '의', the genitive particle, according to semantic classification, so that it can be referred to in determining the contents and methods of related education. The method of this study adopts a quantitative analysis using learners corpus established by National Institute of Korean Language. As a result of the analysis, as proficiency increases, the overall frequency of '의' increases and the number of meaning senses used increases. However, the frequency of errors also increases with it. As for the usage pattern of each sense, the meaning of 'ownership, belonging' is the most frequent, and followed by 'acting entity', 'kinship, social relations', and 'relationship(area)'. In conclusion, the meanings of 'acting subjects' and 'relationships(area) need to be supplemented with explicit education. Other meanings need to be discussed, and decisions should be made in consideration of learning purpose and proficiency.

• Journal of Plant Biology
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• 제29권2호
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• pp.117-127
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• 1986

Phytoplankton community was investigated at the Paldang Dam Reservoir in the Mid-Han River by it's depth, in spring and summer known as the period of phytoplankton's blooming. It was only in summer that phytoplankton bloomed at the investigated area. 128 kinds of phytoplankton were identified and of them, diatoms were abundunt in spring but cyanophyta and chlorophyta were in summer. Because some species with high pollution index were observed in summer, it could be proved that the investigated area was polluted especially in summer. In spring shown the circulation period by vertical distribution pattern of chlorophyll-a and isothermal distribution pattern of water temperature, maximum value of phytoplankton standing crops appeared at the upper layer, except for surface layer. In summer shown the circulation period after the stagnation period by vertical distribution pattern of chlorophyll-a and immediate destruction after stratification of water temperature, maximum value of phytoplankton standing crops appeared at the lower layer. the layer at which the maximum value of chlorophyll-a appeared also accorded with that of phytoplankton standing crops. So, it could be approved that there existed a close relationship among phytoplankton standing crops, chlorophyll-a, and water temperature.

• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1802-1811
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• 2016

A novel battery SOH estimation algorithm based on outlier detection has been presented. The Battery state of health (SOH) is one of the most important parameters that describes the usability state of the power battery system. Firstly, a battery system model with lifetime fading characteristic was established, and the battery characteristic parameters were acquired from the lifetime fading process. Then, the outlier detection method based on angular distribution was used to identify the outliers among the battery behaviors. Lastly, the functional relationship between battery SOH and the outlier distribution was obtained by polynomial fitting method. The experimental results show that the algorithm can identify the outliers accurately, and the absolute error between the SOH estimation value and true value is less than 3%.

• 한국치위생학회지
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• 제18권5호
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• pp.785-795
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• 2018

Objectives: This study aimed to: 1) investigate the beverage consumption pattern among Korean adults, and 2) analyze the relationship between the frequency of beverage consumption and oral health status. Methods: We used data from the 6th Korean National Health and Nutrition Examination Survey. A general linear model was employed to assess the associations between demographic factors and frequency of beverage consumption; and oral health status and the frequency of beverage consumption. Results: The beverage with the highest frequency of intake was coffee (11.5 times per week). More frequent consumptions of fruit juices and carbonated drinks were associated with higher numbers of decayed teeth. Conclusions: To improve oral health, frequent intake of acidic and sweetened beverages should be reduced, and the consumption of milk should be encouraged.