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조원우,김감래,고정석 한국국토정보공사 2010 지적과 국토정보 Vol.40 No.2
유비쿼터스 시대로 표현되는 현재의 상황은 2차원의 속성정보와 위치정보를 3차원뿐만 아니라 4차원의 시간을 적용하여 입체적인 공간정보로 표현하고자 노력하고 있다. 이러한 급격한 기술적·환경적 변화에도 불구하고 3차원 표현에서 가장 중요한 위치를 차지하고 있는 수치표고모형의 정확도에 대한 연구는 초기 영상정합이론에 근거한 이론 및 알고리즘 연구 분야의 부분적 수행 결과 이외에 지속적인 연구 성과가 미흡한 실정이다. 본 연구에서는 다중센서 기반의 위성영상과 디지털항공영상의 센서모델링 기법을 분석하고, 기존의 3차원 모델링 기법과 전역기반의 영상정합 기법에 대한 수학적 모형과 알고리즘에 대하여 적용·분석하였다. 기존의 3차원 센서모델링 기법을 기반으로 전역기반의 영상정합 기법을 적용하여 수치표고모형을 생성하고, 기존 방식으로 제작된 성과와 비교하여 그 결과를 분석함으로써 전역기반의 영상정합 기법에 대한 타당성을 검증하여 수치정사영상의 정확도를 분석하였다. Nowadays, which is called the ubiquitous era, efforts are made to display 2-dimensional attribute information and location information as a 3-dimensional spatial information by applying not only 3-dimensional information but also four-dimensional time. Despite such radical technological, environmental change, studies on the accuracy of digital elevation model which plays the most important role in the three-dimensional display lacks continuous achievements other than partial results in the fields of theories and algorithms based on early theories of image matching. This study analyzed sensor modeling techniques for multi-sensor based satellite images and digital aerial images, and applied and analyzed mathematical models and algorithms for existing 3-dimensional modeling techniques and global image matching techniques. This study created a digital elevation model by applying global image matching technique based on existing three-dimensional sensor modeling techniques, and tested the validity of global image matching technique by comparing with the result manufactured by existing method and analyzing the result of comparison.
Cold Hardiness of 8 Hybrid Poplar Clones for the Introduction to Arid and Semi-Arid Areas
조원우,Romika Chandra,이송희,한지원,이소라,Ganchudur Tsetsegmaa,Khaulenbek Akhmadi,Wi Young Lee,강호덕 한국육종학회 2020 Plant Breeding and Biotechnology Vol.8 No.1
Endodormancy is a key determinant of cold and freezing hardiness in plant cycles. Short plant growth periods and increasing frequencies of frosting caused by increasing temperatures are major environmental challenges faced by trees in arid areas of central Mongolia. In the present study, the primary aim was to determine an effective method for cold hardiness with the use of six introduced and two Mongolian poplar clones. The secondary aim was selecting clones suitable for afforestation in Mongolia. Year old branches were subjected to four temperature treatments to induce cold hardiness. Electrolyte leakage, 2,3,5-triphenyltetrazolium chloride (TTC) reduction, leaf sprouting, and leaf browning rates were compared. High rates of electrolyte leakage and browning rates were observed along with low leaf sprouting at a low-temperature of ‒30℃. Temperatures between ‒25℃ and ‒30℃ damaged certain clones more than others. TTC reduction rate method for determining cold hardiness was considered effective in this case. In addition, Mongolian poplar P. sibirica differed distinctly from other poplar clones owing to the difference in dormancy-breaking whereas DN 247 and DN sim were better adapted to cold hardiness based on TTC reduction rate. These findings suggest that factors such as plant dormancy depth and physiological differences might significantly affect productivity and performance among plants. Evidently, further studies are required using other plant parts for selecting suitable poplar clones.
조원우,엄태원,김정홍 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.6
Headaches attributed to disorders of the sinonasal region make their diagnosis and treatment sometimes challenging. Contact point between opposing mucosal surfaces in the nasal cavity can cause headache by a mechanism of referred pain in the distribution of trigeminal nerve. The most common anatomic abnormality of intranasal contact point is the diverse pattern of septal deviation in association with turbinate deformity or hypertrophy. In the absence of other pathological findings, the evaluation for intranasal contact points should be considered. We herein report that a patient, suffering from headache and periorbital pain refractory to medical treatment, experienced a complete abolition of pain after surgical correction of mucosal contact point in the nasal cavity. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(6):407-10
조원우,사종성,강태원 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.1
A mass sensor used in an automatic suction system plays an important role in measuring the breathing information of patients. However, the sensor is not originally designed for medical purpose, and it is too expensive for use in medical devices. Thus, it needs to be customized for economic applications. As a starting point of economic fabrication, mass sensor models were selected and investigated for replacement. The analysis was carried out by both CFD simulation and experiments. Nine models of structure were selected and compared. The results showed that an asymmetrically designed box type model provided the most realistic fluid flow situation. As a final step before suggesting an economical design of the mass sensor, we compared the prototype of the proposed design with the original structure. It shows that there is almost no difference in function between the current aluminum product and the prototype manufactured using a 3D printer.
CT Urology에서 가돌리늄 조영제 제거를 위한 이중에너지 CT의 Virtual Non-Contrast 기술의 평가
조원우,송현석,심지나,김령희,안치복,김세영 대한CT영상기술학회 2024 대한CT영상기술학회지 Vol.26 No.1
MRI 조영검사를 시행한 환자의 비뇨기계에 잔존한 가돌리늄 조영제는 CT 영상에서 높은 HU로 나타나 CT Urology를 시행하는데 제한을 주고 있다. 본 연구는 이러한 문제를 해결하기 위해 이중에너지 CT(Dual-Energy Computed Tomography; DECT)의 가상 비 조영상(Virtual Non Contrast; VNC) 기술에 주목하여 다양한 이중에너지에서 VNC를 실제 CT Urology에 적용할 수 있는지 평가하였다. MRI 조영검사를 시행하고 CT Chest 비 조영검사를 시행한 환자의 신장 측 요관에 잔존한 가돌리늄 조영제의 HU값을 측정하였다. 그 결과를 바탕으로 가돌리늄 조영제 혼합물 Max, Mean, Min Mixture를 만들어 생리식염수와 함께 팬텀에 삽입하여 에너지별로 스캔하였다. 또한, Iodine Mixture와 요로결석의 HU를 표현한 Virtual Stone을 제작하여 평가하였다. 그 결과, 70 kV와 sn150 kV를 사용한 DECT의 VNC에서 가돌리늄 조영제 혼합물의 대조도가 현저하게 감소하였으며, Min Mixture는 Normal Saline과 HU와 CNR 모두 거의 유사한 형태로 나타났으며, 요오드 조영제와 가상 요로결석과의 구별도 가능했다. 따라서 MRI 조영검사 1시간 30분의 대기시간을 가지고 CT Urology를 시행할 경우, DECT의 VNC를 활용하여 효과적인 가돌리늄 조영제를 제거한 영상을 획득할 수 있음을 확인했다. Residual gadolinium contrast agents in the urinary tract following MRI contrast-enhanced examinations often presents as elevated Hounsfield Unit (HU) values on CT scans, impeding the efficacy of CT urology procedures. This study aims to explore the feasibility of addressing this challenge through the application of the Dual-Energy Computed Tomography (DECT) Virtual Non-Contrast (VNC) technique across various energy levels. HU values of residual gadolinium contrast agent in the renal pelvis and ureter were measured in patients who underwent MRI contrast-enhanced examinations followed by non-contrast CT chest examinations. Subsequently, gadolinium contrast agent mixtures, such as Max, Mean, and Min Mixtures, were created and scanned together with normal saline using DECT at various energy levels. Additionally, an iodine mixture and a virtual stone representing urolithiasis were fabricated and evaluated. The results demonstrated a significant reduction in contrast enhancement of gadolinium contrast agent with DECT VNC at 70 kV and Sn150 kV. The Min Mixture closely resembled normal saline in both HU and Contrast-to-Noise Ratio (CNR), facilitating the differentiation between iodine contrast agent and virtual urolithiasis. Therefore, utilizing DECT VNC after a 1-hour and 30-minute interval following MRI contrast-enhanced examinations effectively eliminates gadolinium contrast agents, improving the efficacy of CT Urology imaging procedures.