• 한국태양에너지학회 논문집
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• 제26권3호
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• pp.53-62
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• 2006

Since the direct normal radiation and clear day are a main factor for designing any solar thermal and photovoltaic concentrating system, it is necessary to evaluate its characteristics all over the country. The work presented here are the investigation of direct normal radiation and clear day in Korea. The data utilized in the investigation consist of direct normal radiation collected for 14 years('90. 12${\sim}$2004. 12) and clear-day collected for 23 years($1982{\sim}2004$) at measuring stations across the country. The analysis shows that the annual-average daily direct normal radiation is 5.4 kWh/m2 and the annual-average total clear-day is 92.7 days in Korea. We also constructed the contour map of direct normal radiation and clear-day in Korea by interpolating actually measured data across the country.

• 대한기계학회논문집A
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• 제25권11호
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• pp.1759-1766
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• 2001

Vibration transient generated by developing localized fault in gear can be used as indicators in gear fault detection. In this paper, we propose the zoomed phase map for a fault signal using continuous wavelet transfers to detect this vibration transient. Local fault induces the abrupt fluctuation of load exciting tooth and phase lag in the vibration signal measured on the gearbox. The relatively large fault like "tip breakage" easily can be detected by the clear fluctuation of exciting load. However, minor fault like "initial pitting"cannot be detected using the load fluctuation. To defect this kind of minor fault, the phase map for a fault signal is taken into account. The phase lag by minor fault is observed well in the zoomed phase map.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2008년도 추계학술대회
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• pp.106-109
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• 2008

The aim of this study is to develop a model of layering system for future soldier system. Future soldier has been supposed to carry various digital devices embedded into the combat uniform. The combat uniform must be developed to be fit to soldier's body and movement, and can be felt comfortable to soldier. The Uniform must be studied in ergonomic and physiological component because it is different from the present one. It has many devices inside, so there are some unknown barriers to set the devices on to the body. For making the ergonomic aspect of future combat suits clear, the movement of the body was researched. The size of arms(3 parts), torsos(4 parts), and legs(3 parts) of people were measured by movement. Many dots were drawn on the testees' bodies every 3cm. Each time they made compulsory poses, the distances between dots be measured and analyzed. For making the physiological aspect of future combat suits clear, the thermo-map and sweating map of body were made. The 3 maps - movement, thermo and sweating- were overlapped. The devices for future soldier were arranged on the overlapped map considering relations between devices. The final layering system developed on the arrangement of devices.

• 한국태양에너지학회 논문집
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• 제39권3호
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• pp.47-57
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• 2019

Clear sky indices were estimated by various ways based on in-situ observation and satellite-derived solar irradiance. In principle, clear sky index defined by clear sky solar irradiance indicates the impacts of cloud on the incoming solar irradiance. However, clear sky index widely used in energy sciences is formulated by extraterrestrial irradiance, which implies the extinction of solar irradiance due to mainly aerosol, water vapor and clouds drops. This study examined the relative difference of clear sky indices and then major characteristics of clear sky irradiance when sky is clear are investigated. Clear sky is defined when clear sky index based on clear sky irradiance is higher than 0.9. In contrast, clear sky index defined by extraterrestrial irradiance is distributed between 0.4 and 0.8. When aerosol optical depth and air mass coefficient are relative larger, solar irradiance is lower due to enhanced extinction, which leads to the lower value of clear sky index defined by extraterrestrial irradiance.

• 한국컴퓨터정보학회논문지
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• 제20권10호
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• pp.39-44
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• 2015

In this paper, we analyze the immersion effects according to the level of map in adventure game. Computer games are actively enjoyed by many people around the world. Game players have frequently experienced the immersion which is an important aspect to be attained from games. However, it is not clear what immersion is and what kinds of factors influence to immersion. Nonetheless, in recent many researches, the elements of humanities and fun were found as factors of immersion in various digital contents such as game, virtual reality, cinema and etc. Therefore, today's games are developed on the basis of the humanities and fun theory that many researchers have been studied for a long time. In games, the balance of the level of map is related with immersion. Hence, it is important to know how the map patterns of game affect immersion of players. In this paper, we developed a 3D survival adventure game named by "1 Hour" using Unity3D in order to simulate how map patterns affect immersion of players. We also analyzed the relationship between the level of map and immersion using the game.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.590-595
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• 2001

Vibration transient generated by developing localized fault in gear can be used as indicators of condition monitoring in a gear. In this paper, we propose the phase map for a fault signal using continuous wavelet transform to detect this vibration transient. Local fault induces the abrupt fluctuation of load exciting tooth and phase lag in the vibration signal measured on the gearbox. The relatively large fault like "tip breakage" easily can be detected by the clear fluctuation of exciting load. However, minor fault like "initial pitting" cannot be detected using the load fluctuation. To detect this kind of minor fault, the phase map for a fault signal is taken into account. The phase lag by minor fault is observed well in the phase map.

• 대한원격탐사학회지
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• 제21권4호
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• pp.329-339
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• 2005

휴대폰의 지도서비스는 단말기의 해상도와 프로세스의 제약으로 인하여 데이터를 간략화하면서 사용자의 이해도를 높일 수 있는 약도의 제공이 보다 효율적일 수 있다. 약도는 출발지와 목적지의 경로를 중심으로, 주변의 중요한 도로나 지형지물 등을 단순화하여 사용자가 이해하기 쉽게 표현된 형태이다. 약도 서비스를 위해서는 우선 출발지와 목적지의 경로 및 그 주변 도로를 선택하여 약도식으로 간략화하는 방법이 필요하며, 단말기의 해상도에 적합하게 주변 지형지물을 간략화 된 도로와 함께 약도화하여 표현하는 방법이 필요하다. 이에 본 논문에서는 휴대폰에서 지도를 효율적으로 표현하기 위하여, 지도 일반화 개념을 이용한 약도화 방법을 제안하였다. 제안하는 약도 표현 방법은 현재 상업적으로 서비스되고 있는 지도 서비스와 비교하여 도로를 구성하는 노드의 수가 감소하고, 중요한 지형지물의 선택 등을 수행하여 데이터 효율성이 우수하고, 경로의 명시성과 이해도가 높은 것으로 조사되었다.

• 한국통신학회논문지
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• 제34권3C호
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• pp.279-287
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• 2009

본 논문에서는 컬러 정보를 이용한 계층적 스테레오 정합 기법을 제안한다. 특징기반의 스테레오 정합 방법을 이용하여 초기 변이지도를 생성하고, 계층적 스테레오 정합 기법으로 최종 변이지도를 획득한다. 영상을 R, G, B, white 4개의 색상 성분으로 분할하여 영상의 경계(edge)를 추출하고, 추출된 경계에서 정합 창을 이용하여 변이(disparity)를 추정한다. 추정된 변이는 각 색상 성분에서 자기상관도(autocorrelation)에 따라 주변 영역으로 확산되어 초기 변이지도(disparity map)를 생성한다. 초기 변이지도는 최종 변이지도를 생성하기 위한 변이 탐색의 초기값으로 사용되고, 각 색상 성분에서 정합 창과 탐색 범위(search range)의 변화를 이용하여 최종 변이 지도를 생성시킨다. 본 논문에서는 Middlebury stereo vision의 4개의 실험 영상을 가지고 객관적 성능 평가를 하였다. 실험 결과 제안한 기법이 기존의 Graph-cuts와 Dynamic Programming 기법보다 우수한 성능을 보였다. 최종 변이지도의 부정확한 변이는 전체 영상에서 평균11% 존재했고, 변이지도에서 불연속점의 경계가 뚜렷한 것을 확인하였다.

• 한국소음진동공학회논문집
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• 제13권8호
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• pp.626-636
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• 2003

The beat distribution property of the King Seong-deok Divine Bell is investigated by experiment and analysis. The beat map method is proposed to explain the beat distribution property on the circumference of the bell. For the analytical investigation, an analytical model of the vibration beat is derived on a slightly asymmetric shell of revolution by using the modal expansion method. In the analytical method, the beat map can be drawn only if the modal parameters of the bell are obtained. The analytical beat model is applied to draw the beat map of the King Seong-deok Divine Bell. The validity of the analytical method is verified by comparing the analytical beat maps with the experimental results. This paper proposes a visualization method of the beat and theoretically identifies the reason why the clear and unclear beats repeat periodically along the circumference of the bell and how the striking position influences the beat distribution property.

• 한국IT서비스학회지
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• 제19권4호
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• pp.1-11
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• 2020

Through text mining, sentiment analysis, and semiotics analysis, this study aims to reinterpret the meaning of user emotional words and related words to derive strategic elements of brand and design. After selecting a local car manufacturer whose user opinion on the brand is a clear topic, web-crawl the car comments of the manufacturer directly created by the users online. Then, analyze the extracted morphology and its associated words and convert them to fit the marketing mix theory. Through this process, propose a methodology that allows consumers to supplement and improve brand elements with negative sensibilities, and to inherit elements with positive sensibilities and manage brands reasonably. In particular, the Map presented in this study are considered to be fully utilized as information for overall brand management.