분자 컴퓨팅을 이용한 원숭이와 바나나 문제 해결

학위논문(석사)--서울대학교 대학원 :협동과정 인지과학전공,2003.Maste

Spatial and temporal variation of sedimentation processes in a estuary, Sunchon bay

학위논문(박사)--서울대학교 대학원 :지리학과,2000.Docto

Performance of a code-spread multicarrier DS-CDMA system in a rayleigh fading channel

Thesis (master`s)--서울대학교 대학원 :전기·컴퓨터공학부,2002.Maste

江華島 鹽生濕地 堆積物에 關한 硏究

학위논문(석사)--서울大學校 大學院 :地理學科,1995.Maste

Spatial and Temporal Variations of Sedimentation Processes in Estuary, Sunchon Bay

염하구는 육상 생태계와 해양 생태계의 영향을 동시에 받는 만입지형으로, 하천과 조류에 의한 퇴적작용은 염하구에서 나타나는 가장 중요한 프로세스이다. 따라서 다양한 시간축척속에서 나타나는 염하구 퇴적과정의 공간적 특성을 분석하는 것은 지금까지의 변화과정과 앞으로 나타날 변화를 예측하는데 중요한 자료를 제공한다. 본 연구에서는 지난 30여년간 빠른 속도로 퇴적환경의 변화를 겪은 순천만 염하구를 대상으로, 염하구 퇴적과정의 시,공간적 변이를 밝히는 것을 목적으로 하였으며, 다음과 같은 세부사항을 살펴보았다. 첫째, 퇴적물의 물리, 화학적 특성을 분석하여 퇴적과정의 변화를 살펴보았다. 둘째, 여과지 트랩법을 이용하여 조석의 일주기에 따른 퇴적량을 분석하였다. 셋째, artificial markerplot볍과 bottle법을 이용하여 연간 퇴적률, 조류의 유출입에 따른 부유하중의 농도 변화를 분석하였다. An estuary is semi-inclosed inlets, located between terrestrial and marine environment. Since many estuaries along south-western coasts of Korean peninsula were affected by human settlemnents and activities, significant changes in sedimentation processes have been observed. An analysis of the sedimentation at various time scales is important work for understanding and managing estuarine environments. The purpose of this is to determin spatial and temporal variations of sedimentation processes in an estuary, Sunchon Bay, in the southern coastal region of Korean peninsula. The research was conducted from 2 Feb 1999 to 1 Feb 2000

The Study of Hydrogeologic Characteristics in Kimpo Landfill Site

Kimpo landfill site was reclaimed 10 years ado. After the reclaimation, the land has not been used for any purpose. The land was selected for the waste-fill site of Seoul Metropolitan Area in 1994. The Land reclaimed from tidal flats has not been studied enough in hydrogeologic aspect. This study was aimed to provide the information of environmental properties at Kimpo landfill site: the climatic and hydrologic characteristics, physical and chemical properties of the sediments, the geologic structures, and the elevation of the underground water. Samples were obtained using the vibracorer into the depth of 6m without disturbance. The results are as fol1ows. 1. Summer season' s concentration rate of precipitation and surface runoff are 47% and 57%, respectively. 2. The mean diameter of sediments in Kimpo landfi1l site is silt size(5-6 φ ). The contents of silt and clay are 60-80% and 10-20%, respetively. But the content of the sand(0.0625-2mm) is different from site to site. 3. The permeability of the sediments is in the range of 1.0 x 10-5cm/sec - 9.0 x 10• 7cm/sec. The permeability of most of the samples exeeds the exclusion criteria for the ladfill site(1.0 x 10-7 cm/sec). 4. The organic matter contents are relatively low(1-7%). The O.M. contents of the upper layer are higher than those of the lower layer. This means that the O.M. of the upper part was oxidized through the contact with the air. 5. pH and the electric conductivity(E. C.) are higher in upper part than the lower part. This result shows that the soluble solute is leaching out rapidly. 6. The geology in this study area is composed of coastal sediment layer, weathered soil layer, weathered rock layer and bedrock layer. The upper sediments have the characterictic of the tidal flat, and get thicker in depth toward the coast. 7. The underground water level is between 1-3m below the surface. The flowing direction is towards the lower tidal creek or coastal side

Development of a Medical Ontology Library: Analysis of the Clinical Terms in the Medical Records of a COPD Patient

Objective: The medical records of a patient with chronic obstructive pulmonary disease(COPD) were analyzed to extract medical concepts and their relationships in order to construct a basic medical ontology. Methods: The medical records included the admission note, vital signs record, doctors order sheets, progress notes, emergency notes, discharge summary, surgical record, and anesthesia record. Results: A total of 396 concepts, 16 relationships, and 460 connections were created. Fourteen top-level concepts, such as body, sign, and procedure, were found. The most common relationship was isA and the second was isPartOf'. All the relationships between the concepts were displayed using the graphic tool GraphViz. Conclusion: A pilot ontology on COPD was constructed through a medical record analysis. The asynchronous cooperation using a web interface for the ontology construction was helpful.본 연구는 보건복지부 의료정보 기술개발사업의 지원에 의하여 연구되었음(과제번호:0412-M102-0404-0002)