• 디지털융복합연구
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• 제12권2호
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• pp.327-333
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• 2014

현재 컴퓨팅 기술은 대부분 웹 기반으로 수행된다. 따라서 사용자는 필요한 자원이나 서비스들을 웹에 등록하고, 찾아 사용할 수 있다. 이러한 서비스들은 단독적으로 사용될 수 있고, 복합적으로 사용될 수 있다. 이것의 복합적 사용은 단위 서비스들의 순서와 연관성이 중요하며, 서비스의 관계를 정의한 온톨로지가 필요하다. 본 논문은 온톨로지를 기반으로 서비스의 연관관계를 정의하고, 이를 통해 서비스를 통합하여 사용할 수 있는 방안을 제안한다. 제안된 방안은 서비스 영역과 데이터 연관 영역으로 구성함으로써 효율적인 서비스 검색이 가능하다.

• Journal of Welding and Joining
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• 제13권3호
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• pp.55-64
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• 1995

Metallizing method on ceramic surface is one of the compositing technology of ceramics and metal. The purpose of this study is to make HIC (Hybrid Intergrated Circuit) with copper metallizing method of which copper layer is formed on ceramic substrate by firing in atmosphere in lieu of conventional hybrid microcircuit systems based on noble metal. Metallizing pastes were made from various copper compounds such as Cu$_{2}$O, CuO, Cu, CuS and kaolin. And the screen printing method was used. The characteristics of metallized copper layers were analyzed through the measurement of sheet resistance, SEM, and EDZX. The results obtainted are summarized as follows; 1. The copper metallizing layers on ceramic surface can be formed by firing in air. 2. The metallized layer using Cu$_{2}$O paste showed the smallest sheet resistance among a group of copper chemical compounds. And optimum metallizing conditions are 15 minutes of firing time, 1000.deg.C of firig temperature, and 3 minutes of deoxidation time. 3. The results of EDAX analysis showed mutual diffusion of Cu and Al. 4. The kaolin plays a important role of deepening the penetration of Cu to $Al_{2}$O$_{3}$ ceramics. But if the kaolin content is too much, sheet resistance increases and copper metallizing layer becomes brittle.

• 대한원격탐사학회지
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• 제27권3호
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• pp.259-276
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• 2011

Short-term land cover changes, such as forest fire scar and crop harvesting, can be detected by high temporal resolution satellite imagery like MODIS and AVHRR. Because these optical satellite images are often obscured by clouds, the static cloud-free composite methods (maximum NDVI, minblue, minVZA, etc.) has been used based on non-overlapping composite period (8-day, 16-day, or a month). Due to relatively long time lag between successive images, these methods are not suitable for observing short-term land cover changes in near-real time. In this study, we suggested a new dynamic cloud-free composite algorithm that uses cut-and-patch method of cloud-masked daily MODIS data using MOD35 products. Because this dynamic composite algorithm generates daily cloud-free MODIS images with the most recent information, it can be used to monitor short-term land cover changes in near-real time. The dynamic composite algorithm also provides information on the date of each pixel used in compositing, thereby makes accurately identify the date of short-term event.

• 대한원격탐사학회지
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• 제34권1호
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• pp.127-139
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• 2018

The GOCI atmospheric correction overland surfaces is essential for the time-series analysis of terrestrial environments with the very high temporal resolution. We develop an operational GOCI atmospheric correction method over land surfaces, which is rather different from the one developed for ocean surface. The GOCI atmospheric correction method basically reduces gases absorption and Rayleigh and aerosol scatterings and to derive surface reflectance from at-sensor radiance. We use the 6S radiative transfer model that requires several input parameters to calculate surface reflectance. In the sensitivity analysis, aerosol optical thickness was the most influential element among other input parameters including atmospheric model, terrain elevation, and aerosol type. To account for the highly variable nature of aerosol within the GOCI target area in northeast Asia, we generate the spatio-temporal aerosol maps using AERONET data for the aerosol correction. For a fast processing, the GOCI atmospheric correction method uses the pre-calculated look up table that directly converts at-sensor radiance to surface reflectance. The atmospheric correction method was validated by comparing with in-situ spectral measurements and MODIS reflectance products. The GOCI surface reflectance showed very similar magnitude and temporal patterns with the in-situ measurements and the MODIS reflectance. The GOCI surface reflectance was slightly higher than the in-situ measurement and MODIS reflectance by 0.01 to 0.06, which might be due to the different viewing angles. Anisotropic effect in the GOCI hourly reflectance needs to be further normalized during the following cloud-free compositing.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.533-534
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• 2013

컴퓨터 게임에서 눈 덥힌 산이나 계곡 등을 표현하기 위해 지형 모델을 사용하며, 이러한 지형모델은 게임 속에서 캐릭터가 생활하는 공간으로 게임에서 없어서는 안 될 중요한 요소이다. 지형모델의 사실적인 묘사는 게임의 몰입도를 좌우하기 때문에, 현재는 많은 지형 모델 툴을 통하여 만들고 있다. 본 논문에서는 지형 모델을 툴을 이용하지 않고, 3D MAX를 이용하여 누구나 쉽게 제작할 수 있는 방법에 대해 설명한다. 3D MAX는 그래픽 디자이너들에게 많이 쓰이고 있으며, 3D 그래픽 소프트웨어로 유지보수가 쉽다는 장점이 있다. 본 논문에서는 3D MAX를 이용하여 지형 모델을 만들고, 이를 DirectX 환경에서 사용하는 방법에 대해 설명한다.

• 제어로봇시스템학회논문지
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• 제14권2호
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• pp.205-211
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• 2008

This paper describes the method aimed at establishing the equipment measuring the parameter of Cable Network by Best proper Cable Modem and PDA through RS232 interface. In this paper, we propose our creative experimental configuration and develope the Cable Modem (DOCSIS 2.0) superior more performing than the referred Cable Modem (DOCSIS 1.0, 1.1) and the measuring equipment of HFC network compositing of Cable Modem and PDA through RS232 interface. This equipment analyzes Upstream (U/S) and Downstream (D/S) Signal quality and generates the signal of Upstream by CW signal. The paper also provides the experimental results to check the Best Proper Cable Modem and the displayed screen for parameters for SNR, BER and the demodulated IQ diagram of 256QAM through LCD of PDA. Henceforth, it'll be possible to support a variety of the functions for E-mail, Internet, the speed test of WEB connection and the transmission of the measured result real time by PDA.

• 대한가정학회지
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• 제50권8호
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• pp.41-52
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• 2012

The purpose of the current study is to examine the role of mothers' personality traits in predicting their parenting stress. The study subjects were married working woman who live at Gyeonggi-do and has their first child studying in elementary, middle, or high school. Collected data were analyzed with SPSS WIN 18.0 program. The results were as follows.: First, it has been shown through examination of the general tendency of observation subjects' relative factor, that many have above average parenting stress. The compositing factor for parenting stress were mainly the burden and distress of the parent role. Second, the differences in parenting stress were affected by relative variables in accordance with the general features of the study object. If the younger the parent, the higher the education, the lower the age of the first child, and if there were a child assistant after school, the parenting stress became larger. Third, after controlling for demographic characteristics, employed mothers' neuroticism significantly predicted greater parenting stress. When mothers had more conscientiousness and openness, they reported less parenting stress which implied that interpretation and perception of child rearing experiences can vary depending on personality and predict parenting stress of working mothers.

• 교육시설 논문지
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• 제23권3호
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• pp.3-10
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• 2016

This study compared evacuation effectiveness between the conventional school floor plan and a suggested hypothetical floor plan that was generated by a mathematical model that is commonly applied in the field of industrial engineering. Recent school buildings became much more complicated in floor planning due to the new educational system and modern curriculum than the old days. Nevertheless, architect's approach to floor composition in terms of fire emergency evacuation planning, still has no relation to optimized effective but relies more on a conventional school planning. Therefore, since elementary school buildings are much more likely to be exposed to any fire related events than middle school or high-school, emergency exit effectiveness based on spatial composition has to be seriously evaluated with a scientific method. The algorithm, which acquires the number of persons in each spatial type (node) per floor and the minimum physical distance between spatial types (arc), can propose the most optimized spatial compositing per floor regarding emergency evacuation event. Consequently, this study evaluated elementary school's fire exit effectiveness with the scientific tool and suggested the most reliable spatial composition per floor regarding possibile emergency evacuation event.

• 한국생산제조학회지
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• 제19권4호
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• pp.511-520
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• 2010

In general, spot welding is used at no welding rod or flux for the process, low welding point temperature compared to arc welding, short heating time, less damage to the parent material, and low deformation and residual stress, relatively. Also, because of the pressurization effect, better mechanical qualities of the welding parts are obtained. Therefore, in various fields of industry its rapid operation speed can make mass production possible such as motor industry. In FEM analysis for the spot welding process, it is effective to use simple modeling rather than complicated one because of its numerous number of spots and reduction of analysis time. Therefore, this study provides with not only simplification of modeling analysis by using beam component composition of structure without re-compositing the spot welding point mesh but also modeling analysis of which property of fracture strength is reflected. In addition complete spot welding model is examined at rectangular post shape (hat shape) by impact test, compared the results, and verified its validity. As a result, it is possible to optimize the welding position and to recognize the strength of structure and the proposed equal distance model shows the effect of welding point reduction and improvement of stiffness.

• 스마트미디어저널
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• 제4권3호
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• pp.31-37
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• 2015

최근 컴퓨터그래픽스는 실사에 가까운 표현이 가능하게 되었다. 하지만, 2D 컴퓨터그래픽스 고유의 느낌을 선호하는 면도 없진 않다. 2D 컴퓨터그래픽스와 3D 컴퓨터그래픽스의 합성 작업은 이미 오래전부터 제작되어왔다. 하지만, 기술적인 차이로 한계를 넘지 못하거나 실사 2D에 가상의 3D 컴퓨터그래픽스가 도입되거나 2D 컴퓨터그래픽스에 이펙트 등 효과가 3D 컴퓨터그래픽스 작업을 통해 제작되어 왔다. 최근에는 웹툰 등 2D 컴퓨터그래픽스로 작업하면서 시간적으로 좀 더 제약을 많는 콘텐츠 등에 2D 컴퓨터그래픽스로 작업한 느낌을 살리면서 카메라 앵글이나 시공간적인 장면 전환이 용이한 요소를 3D컴퓨터그래픽스로 작업하여 작업의 효율을 높이는 경우가 있다. 실제 작업을 통해 적절한 방향을 제시해보고자 한다.