• 한국농공학회논문집
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• 제49권3호
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• pp.11-20
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• 2007

Estimation of crop consumptive use is a key term of agricultural water resource systems design and operation. The 10-year return period drought has special aspects as a reference period in design process of irrigation systems in terms of agricultural water demand analysis so that crop evapotranspiration (ETc) about the return period also has to be analyzed to assist understanding of crop water requirement of paddy rice. In this study, The ETc of 10-year return period drought was computed using frequency analysis by 54 meteorological stations. To find an optimal probability distribution, 8 types of probability distribution function were tested by three the goodness of fit tests including ${\chi}^2$(Chi-Square), K-S (Kolmogorov-Smirnov) and PPCC (Probability Plot Correlation Coefficient). Optimal probability distribution function was selected the 2-parameter Log-Normal (LN2) distribution function among 8 distribution functions. Using the two selected distribution functions, the ETc of 10-year return period drought was estimated for 54 meteorological stations and compared with prior study results suggested by other researchers.

• 한국측량학회지
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• 제31권2호
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• pp.111-119
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• 2013

항공 라이다로부터 획득한 대용량의 3차원 점 데이터로부터 대상 물체의 윤곽정보를 추출하는 것은 데이터 처리 과정에서 필수적이며 기반적인 기술 중의 하나이다. 특히 인공 구조물인 건물은 복잡한 현대 도시를 구성하는 주요 구조물이며 그 형태가 명확하기에 윤곽 정보의 추출 과정이 더욱 중요하다 할 수 있다. 본 연구에서는 항공 라이다를 이용하여 얻어진 건물을 구성하는 3차원 점 데이터로부터 건물의 윤곽정보를 추출하기 위하여 점 데이터의 기하정보만을 이용한 확장 카이(${\chi}$-Chi) 알고리즘을 제안한다. 제안된 알고리즘은 임의의 점군을 델로니(Delaunay) 삼각망으로 구성하고 특정 조건을 만족하는 변(edge)를 제거하는 과정을 통하여 구현된다. 덧붙여, 전체적인 추출과정의 효율화를 위해서 델로니 삼각망의 구성을 스윕헐 알고리즘을 적용하여 수행하였다. 본 연구에서 제안하는 확장 카이 알고리즘의 성능을 확인하기 위하여 본 연구와 같은 목적으로 개발된 인케이싱 폴리곤 제작 알고리즘과 알파 쉐이프 알고리즘을 비교하였고 기 제작된 건물의 도화정보를 이용하여 윤곽정보 추출의 정확도를 비교하였다. 실험결과, 본 연구에서 제안한 알고리즘은 기존의 알고리즘들보다 윤곽정보 추출 속도 및 정확도가 향상됨을 확인하였다.

• 한국조경학회지
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• 제33권4호
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• pp.143-154
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• 2005

The Seoul Housing Corporation pronounced a design competition for Eunpyeng New Town District 2 in March of 2005. The authors collaborated on this design and won rot prize. Design guidelines of this competition were to make environmentally sustainable design, to develop as a resort site and cultural place for everyday life of residents, to link with green fabric of the district, and to elevate positive image and identity of Eunpyeng New Town district by creating a attractive landscape. The authors developed design concept and strategy within the guidelines and site conditions. The environmental setting of this site was characterized by mountain to the rear of the site with a stream passing through the district and the front of the site. This is the most important condition for the location principle of residence in Fung Shui theory. Therefore, the schema of the design was introduced by Fung Shui and Chi of place. To evolve design concept, we reinterpret the Fung Shui and Chi in the site combining with modem landscape design strategy, so that good place making could bring about well-being life of residents. By doing that, design concept of the proposal evolved as follows: 'fullness of comfortable life', 'adaptation of nature', 'inspiration of natural force'. This design approach is critical reevaluation of regional characters employing modem strategy. It is a conscious strategy of critical regionalism as distinguished from the traditional site oriented approach. The following are some of the major features in the design: green network and water recycle system in the site, promenade of forest with the experience nature, link to community core, theme gardens with plants having strong fragrances, terrace gardens with different level of housing type, playgrounds and resting places with many types, human scale facilities for residents.

• 대한한방내과학회지
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• 제30권4호
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• pp.880-892
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• 2009

Objectives : This study is about a comparison of controlled and uncontrolled hypertension groups regarding pulse shape and quality of life. We aimed to find out if pulse shape would be able to help with hypertension treatment and care. Methods : We surveyed "controlled and uncontrolled hypertension patients" using SF-36, HTN QoL (measurement scale for the quality of life in hypertensive patients) and 3-D MAC pulse analyzer for pulse shape. Results : The uncontrolled hypertension group tended to have a sink pulse in the left cun. right guan & chi parts compared to the controlled hypertension group. Within the controlled hypertension group, patients who had a float pulse shape in both guan parts had a higher quality of life than patients who had a normal pulse shape. And the patients who had a normal pulse shape in both chi parts had a higher quality of life than patients with a slow or fast pulse shape. Within the uncontrolled hypertension grouP. the patients who had a normal pulse shape in right guan part had a higher quality of life than those with a choppy pulse shape. Nevertheless, these results were limited to only a few quality of life issues and were inconsistent in relation to specific pulse shapes. Conclusion : If we have more samples and better methods for collecting data, we will have better results, allowing us to improve our ability to predict and treat hypertension.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.561-562
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• 2011

인 휠 모터를 이용하여 구동되는 전기차량은 각 모터의 동기 제어가 요구된다. 기존의 마이크로컨트롤러는 구동시킬 수 있는 모터의 개수가 제한되어 인 휠 모터를 이용하여 구동되는 전기차량과 같은 다축 제어 시스템에 적용하기가 어렵다. 따라서 본 논문에서는 FPGA(Field Programmable Gate Array)를 이용하여 4축 동기 SVPWM 기법을 구현하였으며, 시뮬레이션을 통하여 성능을 확인하였다.

• 한국산업융합학회 논문집
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• 제20권1호
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• pp.56-66
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• 2017

In this experimental study, it is designed and used the test engine bed which is installed with the exhaust gas recirculation, and in addition to equipped using by oxygen adder. It has been tested and analyzed the combustion and emission characteristics, cycle variability and engine performance by controlling the oxygen volume fraction, EGR rate, engine speed and equivalence ratio.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.249-250
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• 2012

해상 풍력 발전은 가장 유망한 재생 에너지원의 하나이며, 육상 풍력 발전보다 풍력이 강력하고 일정하여 장시간 고출력 발생이 가능하다. 또한 소음, 공간적 한계, 경관훼손 등 기존 육상 풍력 발전의 단점을 보완하고 초대형 단지조성이 가능한 장점이 있다. 초대형 해상풍력단지에는 일반적으로 MW급의 해상풍력발전기가 사용된다. 본 논문에서는 MW급의 해상 풍력발전기에 ANPC(Active Neutral-Point-Clamped) Multi-Level VSC(Voltage Source Converter)를 적용하여 Back-to-Back으로 구성한 시스템을 제안하고 계통연계형 풍력 발전 시스템을 모의한 시뮬레이션을 통하여 제안된 시스템의 성능을 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.65-66
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• 2012

최근 많은 산업분야에서 로봇이 사용되고 있으며, 로봇을 산업 공정에 적용시키기 위해서는 인간의 협업이 반드시 필요하다. 또한 사람의 안전은 무엇보다 중요하기 때문에, 사람과 로봇이 충돌시 로봇이 정지되는 기능은 반드시 필요하다. 그러므로, 본 논문에서는 추정된 관성과 속도 변화량에 의해 계산된 기계적 토크와, q축 전류에 의해 계산된 전기적 토크를 비교하여 로봇이 사람이나 물체에 충돌시 이를 감지하고, 속도 지령을 감소 시킴으로써 로봇이 정지 하는 기능을 시뮬레이션과 실험을 통하여 검증 하였다.

• 성인간호학회지
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• 제19권4호
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• pp.527-534
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• 2007

Purpose: The purpose of this study was to identify the effect of a simulated disability program on attitude and stereotyping by nursing students toward people with disabilities. Methods: A total of 107 undergraduate nursing students attended and completed pre-and post-questionnaires on attitude and stereotyping. The experimental group participated in a simulation exercise program which was composed of wheel-chair mobility and vision modification in Nam-won Rehabilitation Center. The data were analyzed by the SPSS 12.0 program including frequency, percentage, ${\chi}^2$ test and t-test. Results: There was no significant difference in attitude toward people with disabilities between the two groups (t=-.743, p=.459). But there was a significant difference in stereotyping between the experimental and the control group(t=-4.097, p=.000). Conclusion: As the result of this study, we can conclude that the program was effective to improve stereotyping toward people with disabilities.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.761-762
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• 2008

This paper presents a hardware accelerator for accelerating vector graphics applications based on the OpenVG standard. Since our design mainly targets embedded applications, we focus on efficient uses of limited resources, especially the memory bandwidth. The designed accelerator can process the images of $640{\times}240$ pixels with moderate complexity at the rate of 30 frames per second.