• 한국연소학회지
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• 제9권2호
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• pp.30-37
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• 2004

Coal combustion in an iron ore sintering bed is a key parameter that determines quality of the sintered ores and productivity of the process. In this study, effects of the different types of coal - coke and anthracite - on the combustion in the iron ore sintering bed are investigated by modeling and experiment. Fuel characteristics of coke and anthracite are observed through a set of basic analysis and thermo-gravimetric analysis. Coke has a higher reactivity than anthracite due to the difference of surface area and density, and these characteristics are reflected in the 1-D unsteady simulation of the iron ore sintering bed. Calculation results show that different reactivity of the fuel can affect the bed combustion.

• 한국기계가공학회지
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• 제10권6호
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• pp.102-108
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• 2011

The flow characteristics of unventilated dual impinging jets were experimentally investigated. Two nozzles with an aspect ratio of 20 were separated by 6 nozzle widths. The Reynolds number based on nozzle width and nozzle exit velocity was set to 5,000. A Particle Image Velocimetry (PIV) was used to measure turbulent velocity components. It was found that, when an impingement plate was installed in the converging region, there was a stagnation region in the inner area between nozzles. However, when it was installed in the combined region, both jets were merged and collided into the plate, showing single-jet characteristics. In addition, at a dual impinging jet, as the distance between a nozzle and an impingement plate decreased, the spanwise turbulent intensity at the plate increased.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.930-932
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• 2005

The line-start permanent magnet synchronous motor has a high efficiency and an advantage in constant speed operation regardless of the effect of load variation. However it is difficult to predict the performance of characteristics accurately, because of the unbalanced starting torque with the initial starting position of the rotor and the generation of a break torque. In this paper the dynamic characteristics of the line-start permanent magnet synchronous motor are described and compared with those of the squirrel-cage induction motor through the simulation to find the characteristics of the permanent magnets and the rotor bars in the line-start permanent magnet synchronous motor.

• 대한기계학회논문집B
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• 제28권4호
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• pp.449-455
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• 2004

The objective of this study is to obtain the correlation between the spray characteristics and the etching characteristics for the optimization of etching system in the micro fabrication industry. The etching characteristics such as etching rate were measured under different conditions. The single spray characteristics such as droplet size and velocity were measured by PDA system. These were compared to the etching characteristics. The twin spray characteristics in the overlap region were analyzed to predict the effect of them on the etching characteristics with the pitch and also were compared to the single spray. The etching rate was increased in case of high spray pressure and in the region of spray center. It was found that the etching characteristics could be correlated with the single spray characteristics and the twin spray characteristics were correlated with the etching characteristics.

• 패션비즈니스
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• 제17권5호
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• pp.151-164
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• 2013

This study analyzes the conditions of merchandises from the popular domestic and foreign. In this study, 845 merchandises of 18 popular singers in Korea and 705 merchandises of 20 popular foreign singers are selected. The results of this study are as follows. First, the highest order of merchandise categories among Korean singers are stationeries and toys, followed by fashion accessories, clothes and interior decoration products. For the foreign singers, the highest order of merchandise categories are clothes, followed by fashion accessories, stationeries and toys, and interior decoration products. Second, the most common characteristics of graphic images on the merchandises from Korean singers are characters and expressions of person and body followed by logos, symbols, and gestures of body. Among the foreign singers, the most common characteristics of graphic images are logos, symbols, and gestures of body followed by logos, symbols. Third, by comparing the price ranges between the Korean and foreign merchandises, it is found that foreign singers' merchandises have a more diverse price range than local ones. The highest ordered price ranges among Korean singers are less than 10,000 won, followed by 10,000~20,000 won and 20,000~30,000 won. Among the foreign singers, the highest ordered price ranges are 20,000~30,000 won, followed by 20,000~30,000 won, and 30,000~40,000 won, and less than 10,000 won.

• 한방재활의학과학회지
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• 제18권3호
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• pp.99-118
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• 2008

Objectives : This study aimed to understand the satisfaction degree of patients due to traffic accident(TA) in order to provide basic data which would give help not only to improve the quality of services, but also to strengthen the competitiveness of oriental medical hospitals on sequela of TA patients. Methods : The data were collected from inpatients and outpatients who answered a self-report questionnaire. Independent t-test, analysis of variance(ANOVA), $X^2$-test, correlation analysis were used for data analysis. Results : According to the research on medical satisfaction degree, the overall satisfaction degree was 4.141. On each field, satisfaction degree related to the doctor service recorded the highest degree among others(4.474). Satisfaction degree related to the appropriateness of service was the second(4.091). On the other hand, satisfaction degree of using procedure was the lowest degree(3.857). On the difference of degrees of satisfaction by general characteristics, patients who were unemployed houseworker group showed lower doctor service satisfaction degree than that of other groups. However, on the difference of degrees of satisfaction related to other general characteristics, there were no significant differences(p<0.05). Conclusions : The service distribution of oriental medical hospital was almost equal without concentrating on specified social classes.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.308-313
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• 2005

An urban railway vehicle has a characteristics such as that a lot of passenger use it and the major of passenger is standee. The ride comfort of standee is greatly influenced by the lateral dynamic characteristics of vehicle. So the lateral vibration is important factor for the improvement of ride comfort. In this study, vibration test of railway vehicle is carried out under the same condition of field driving to find out the major factor of vibration. By considering the test results under the various driving condition, the vibrational characteristics of vehicle is verified.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.715-718
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• 2008

In this study, we analyzed the hydraulic characteristics of rivers by dam discharge change affecting in the river environment. To do this, survey variability of the Soyanggang dam discharge. We analyzed hydraulic characteristics of rivers by the discharge using HEC-RAS model(linear dimension) and RMA2 model(two-dimension) and show the results.

• 자연과학논문집
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• 제19권1호
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• pp.95-111
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• 2008

This paper aims to discussion the characteristics of location and spatial organization on the Donam SeoWon(confucian academy). To do this, we studied in analysis of the present conditions and photographing, research materials about the from of physical structure and review of historical documents. The result of analysis in the sight of the location and spatial organization was good matched. The spatial organization of the Donam SeoWon(confucian academy) was divided into entry space, lecturing space, management space and sacrificial space. Jonhakhumyo constructs axis of “Sanangru - Ipdeokmun - Yangseongdang - Naesammun - Sungryesa” and Eungdodang that not removed hall with 1880 shows characteristics a right angle in the left side of axis remove to location of present 1971. The result of this study, analysis of axis and Spatial structure shows backgrounds of these locations shows that the political and social, economical phenomena were influenced to the locations and spatial organization of the Donam SeoWon(confucian academy).

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.467-468
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• 2009