고온용 Nitinol 형상기억합금의 열적/동역학적 특성평가

차수영,박상언,조채룡,박종권,정세영 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In the resent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. But, no detailed researches between the thermo-dynamic property in Nitinol alloy have been done yet. In this study, the thermal property of high temperature Nitinol shape memory alloy were evaluated using differential scanning calorimeter(DSC). The structure property was investigated using X-ray diffraction(XRD). A dynamic mechanical analyzer(DMA) with three point bending mode was used to study storage and loss modulus of shape memory alloy according to the thirteen frequencies in the temperature range between 30 and 200℃. The effects of the temperature heating/cooling rate, the frequency on the damping capacity have been systematically investigated. Such a frequency and temperature changes also influenced significantly to the damping behavior of the shape memory alloy. It was also found that Nitinol exhibited high damping capacity during phase transformation.

시계열 위성영상 자료의 하모닉 분석을 이용한 식생 분류기법 연구

차수영,피웅환,이종혁,박종화 한국임학회 2012 산림과학 공동학술대회 논문집 Vol.2012 No.-

Identification of two common types of forest cover, Pinus densiflora(Pd) and Querqus mongolica(Qm), using the 1st harmonics of a Discrete Fourier Transform

차수영,Ung-hwan Pi,Jong-Hyuk Yi,박종화 대한원격탐사학회 2011 大韓遠隔探査學會誌 Vol.27 No.3

The time-series normalized difference vegetation index (NDVI) product has proven to be a powerful tool to investigate the phenological information because it can monitor the change of the forests with very high time-resolution. This study described the application of the DFT analysis over the 9 year MODIS data for the identification of the two types of vegetation cover, Pinus densiflora(Pd) and Querqus mongolica(Qm) which are dominant species of evergreen and broadleaved deciduous forest, respectively. The total number of samples was 5148 reference cycles which consist of 2160 Pd and 2988 Qm. They were extracted from the pixel-based MODIS scenes over the 9 years from 2000 to 2008 of South Korea. The DFT analysis was mainly focused on the 0th and 1^(st) harmonic components, each of which represents the mean value and the variation amplitude of the NDVI over the years, respectively. The 0^(th) harmonic values of the vegetation Pd and Qm averaged over the 9 years were 0.74 and 0.65, respectively. This implies that Pd has a higher NDVI than Qm. Similarly obtained 1^(st) harmonic values of Pd and Qm were 0.19 and 0.27, respectively. This can be intuitively understood considering that the seasonal variation of Qm is much larger than Pd. This distinctive difference of the 1^(st) harmonic value has been used to identify evergreen and deciduous forests. Overall agreement between the Fourier analysis-based map and the actal vegetation map has been estimated to be as high as 75%. This study found that the DFT analysis can be a concise and repeatable method to separate and trace the changes of evergreen and deciduous forest using the annual NDVI cycles.

Simple Fabrication of p-type Mn-doped ZnO Thin Films by Using only Ar Working-pressure Control

차수영,김수재,신종문,조채용,조용찬,정세영,배종성 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.5

Mn-doped ZnO (ZMO) semiconductor thin films were synthesized using a radio-frequency (RF) sputtering system, and p-type ZMO thin films were produced using only Ar working-pressure control at room temperature with no additional dopant. The carrier type and the density were confirmed using a Hall measurement system. The role of Mn ions in the p-type ZMO thin films was investigated using X-ray photoelectron spectroscopy (XPS). The p-type properties and the potential device applications were investigated through hetero p-n junction ZMO/Si diode operation. We improved the contact property between the electrode and the device material by using an isostatic pressure treatment under an Ar atmosphere.

조류서식지 평가모형을 이용한 서울시 녹지네트워크 구상

차수영,박종화 한국조경학회 1999 韓國造景學會誌 Vol.27 No.4

Present green space planning of Korea pay little attention to biodiversity conservation in urban areas. The quality of urban wildlife habitat has been deteriorated severely due to fragmentation and isolation of urban open spaces. The application of ecological corridors to urban green space planning and management can greatly enhance the bird habitat of Seoul. The objectives of this study were to evaluate bird habitat potential of existing urban parks of Seoul, and to investigate methods to develop ecological corridors for wild birds. This study consists of three parts. The first part is to construct bird species/habitat relationship model. The second part is to evaluate 207 urban parks of Seoul with the model. Based on the relative potential for bird habitat, urban parks of Seoul can be classified into cores, nodes, and points of the network. Outcomes of this part can also be used to enhance the quality of bird habitats by identifying limits or weakness of existing green spaces for bird habitat. The final part is to develop three green network plans; north-south network, the Han river network, and a district network for Kangnam-Gu.

융합적 문제해결력을 높이는 초등학교 인공지능 융합교육 프로그램 개발

차수영,조정원 제주대학교 지능소프트웨어 교육연구소 2022 지능정보융합과 미래교육 Vol.1 No.1

객체-관계 변환 방법론 기반 메타데이터 레지스트리 데이터베이스 설계

차수영(Sooyoung Cha),이석훈(Sukhoon Lee),정동원(Dongwon Jeong),백두권(Doo-Kwon Baik) Korean Institute of Information Scientists and Eng 2015 정보과학회논문지 Vol.42 No.9

The ISO/IEC 11179 Metadata registry (MDR) is an international standard that was developed to register and share metadata. ISO/IEC 11179 represents an MDR as a metamodel that is an object model. However, it is difficult to develop an MDR based on ISO/IEC 11179 because the standard has no clear criteria to transform the metamodel into a database. In this paper, we suggest the design of an MDR data model that is based on object-relational transformation methodology (ORTM) for the MDR implementation. Hence, we classify the transformation methods of ORTM according to the corresponding relationships. After classification, we propose modeling rules by defining the standard use of the transformation. This paper builds the relational database tables as an implementation result of an MDR data model. Through experiments and evaluation, we verify the proposed modeling rules and evaluate the suitability of the created table structures. As the result, the proposed method shows that the table structures preserve classes and relationships of the standard metamodel well.

시계열 MODIS 자료의 식생지수를 이용한 북한 개마고원 지역의 생물계절 특성 연구

차수영(Su-young Cha),서동조(Dong-jo Seo),박종화(Chong-hwa Park) 한국콘텐츠학회 2009 한국콘텐츠학회 종합학술대회 논문집 Vol.7 No.1

최근 북한지역에 발생한 홍수와 가뭄 등 심각한 자연재해의 원인이 악화된 식량난으로 인한 과도한 산림의 훼손으로 추정되고 있어 북한 지역의 산림 생태계에 대한 연구의 필요성을 더욱 확인하는 계기가 되고 있다. 위성자료로부터 얻을 수 있는 식생지수(NDVI)는 농작물, 초목, 산림등과 같은 중요한 식생자원을 모니터링 하기 위해 설계된 도구로 식생의 활력도를 정량적으로 표현할 수 있다. 또한, 식생지수는 개략적인 식생을 파악하는데 주로 사용되기 때문에 초기조사에 많이 이용되고 있다. 따라서, 본 연구에서는 개마고원지대를 포함하는 표고 1000m 이상의 한대림지대의 산림식생에 대해 9년(2000~2008)간의 시계열 MODIS영상에서 나타나는 식생지수의 생물계절 특징을 분석하였다. 식생이 성장하기 시작하는 시기(the beginning of the growing season)는 5월 9일 이후부터 5월 25일 사이의 기간으로 나타났고, 식생의 휴면 시기(the end of growing season)는 9월 14일부터 9월 30일 사이 기간으로 관측되었다. 이는 4월 초에 시작하고 10월에 사라지는 한반도의 일반적이 식생패턴보다 성장은 한달 늦게, 휴면은 한달 이르게 한다는 것이 확인되었다. 또한, 8월 초순의 NDVI 값이 9년 동안 계속적으로 가장 높은 값을 보여주고 있다. 이것은 개마고원지역 및 주변 한대림 지대는 7월 말에서 8월 초순에 식생이 가장 활발한 것을 의미한다. 9년 동안 전반적인 식생지수는 0.2~0.9 값을 보였고, 특이할 점은 9년 동안의 평균적인 NDVI 값에 비해 2002년의 식생의 활동이 봄에 빨리 개화하고 가을에 일찍 지는 패턴을 보였다.

MODIS자료를 이용한 북한 개마고원 및 백무고원 식생의 생물계절 모니터링

차수영 ( Su Young Cha ),서동조 ( Dong Jo Seo ),박종화 ( Chong Hwa Park ) 대한원격탐사학회 2009 大韓遠隔探査學會誌 Vol.25 No.5

NDVI(Normal Difference Vegetation Index)는 식생의 광합성량과 직접적인 상호관련성이 있기 때문에 생태학적인 목적으로 이러한 지수들의 수많은 응용 가능성이 있다. 본 연구에서는 시계열 MODIS(Moderate Resolution Imaging Spectroradiometer) NDVI 자료를 이용하여 9년 동안 (2000~2008)의 북한 북부고원지대 아고산·고산 식생의 생물계절 특징을 모니터링 하였다. 5월 초순의 급격한 성장 이후 6월부터 8월까지 NDVI값은 0.8이상 지속적으로 유지되었고 최대 식생 생산량과 시기는 각각 0.86, 7월 28일 이었다. 식생 성장의 시작과 쇠퇴는 평균적으로 각각 5월 9일, 9월 30일이었고, NDVI 값은 각각 0.51,0.54이었다. 식생 성장 기간은 2003년에 128일로 가장 짧았고 2000년과 2005년은 176일로 가장 길었다. 그리고, 동일한 수직적 산림 식생 환경을 가지고 있는 남한의 설악산과 지리산의 생물계절 특성과 비교하였다. 남북한의 아고산·고산 식생대는 약 30일 이상의 식생 생육 기간의 차이가 있었고 남한지역이 MODIS 자료의 합성 주기인 16일만큼 개서시기가 빨랐다. 본 연구는 북한 고원지대 산림 식생의 시계열 및 생물계절적인 변화를 정량적으로 분석한 연구로서 그 의의가 클 뿐만 아니라 북한 지역의 산림 식생라이브러리 작성 및 통일을 대비한 북한 자연환경계획 수립에 기초 베이스맵으로 활용될 수 있다. Many researches have shown that NDVI provides a potential methods to derive meaningful metrics that describe ecosystem functions. In this paper we investigated the use of the MODIS NDVI (Normalized Difference Vegetation Index) to monitor vegetation phenology dynamics of Northern plateau region, North Korea, during last 9-years (2000~2008). The findings of this paper can be summarized as follows. First, the length of growing season ranged from a low of 128 days in 2003 to a high of 176 days in 2000 and 2005. On the average of the last 9 years, the highest NDVI of 0.86 was marked on 28 July. Greenup onset occurs at the start of May, while the senescence begins between late September and October. Second, these annual vegetation cycles were compared with Seorak and Jiri Mountain regions of South Korea which have similar vegetation condition. Greenup onsets in South Korea were observed earlier than those of North Korea and the average time lag between the South and North Korea in Greenup was about 16 days which is a time-resolution of remotely sensed data. Sub-alpine conifers of such areas may be severely affected by the large of phenological characteristics due to the global warming trend.

객체-관계 변환 방법론을 위한 이진 결정 다이어그램 기반의 모델링 규칙

차수영(Sooyoung Cha),이석훈(Sukhoon Lee),백두권(Doo-Kwon Baik) Korean Institute of Information Scientists and Eng 2015 정보과학회논문지 Vol.42 No.11

In order to design a system, software developers use an object model such as the UML class diagram. Object-Relational Transformation Methodology (ORTM) is a methodology to transform the relationships that are expressed in the object model into relational database tables, and it is applied for the implementation of the designed system. Previous ORTM studies have suggested a number of transformation methods to represent one relationship. However, there is an implementation problem that is difficult to apply because the usage criteria for each transformation method do not exist. Therefore, this paper proposes a binary decision diagram-based modeling rule for each relationship. Hence, we define the conditions for distinguishing the transformation methods. By measuring the query execution time, we also evaluate the modeling rules that are required for the verification. After evaluation, we re-define the final modeling rules which are represented by propositional logic, and show that our proposed modeling rules are useful for the implementation of the designed system through a case study.