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경수 6∼7번 완전손상 장애인을 위한 타이핑 보조도구의 유형이 컴퓨터 입력장치에 미치는 영향
이한림,권혁철 대한작업치료학회 2002 대한작업치료학회지 Vol.10 No.1
Objective: The purpose of this paper was to study the effect of typing speed and accuracy according to 4 different typing aids on computer keyboard and mouse use. Method: The subjects of this study were 11 of C6∼C7 complete injury patients who had been over six months after injury, and four style of the typing aids, finger, slip-on, band, and modified finger, were used in this study. Each data of typing aid was collected by measuring typing speed and accuracy and analysed with SPSS 10.0. Results: The measured result according to 4 typing aids in typing speed showed that a modified finger typing aid was 41.09 as the highest performance and a bend typing aid was 33.27 as the lowest performance. The typing speed through styles was statistically significant(p<0.05). The measured result according to typing aid style in typing accuracy showed that a bend typing aid was 96.45% as the highest performance and a finger typing aid was 95.45% as the lowest performance. The typing accuracy through styles was not statistically significant(p>0.05). Conclusion: The results of this study showed that modified typing aid seems to be the most efficient among four style of typing aids. Thus, modified typing aid can be an available typing aid having both functional and cosmetic factor for C6∼C7 complete injured patients. In the future use of the modified typing aid should be needed much more as well as its reevaluation should be performed.
이한림,김준,Jaeyong Ryu,권순철,노영민,Myojeong Gu 한국광학회 2010 Current Optics and Photonics Vol.14 No.3
A scanning imaging spectrograph system was used in this study to retrieve readings of the 2-D distribution of SO2 and BrO around the crater of the Sakurajima volcano in Japan. The measurement was carried out during the daytime on November 2, 2005. Measurements were made at the surface of the site, located 5 km from the Sakurajima crater. One hundred horizontal scans were performed. Each column scanned by the system consists of 64 vertical pixels in order to retrieve the spatial distributions of BrO and SO2 in the plume in terms of slant column densities (SCDs). Measured spectra were analyzed to identify and quantify SO2 and BrO in the volcanic plume utilizing the plume’s specific absorption features in the ultra violet region. Two-dimensional BrO and SO2 distributions in SCD were retrieved horizontally covering the upwind, crater and downwind areas, and vertically, including the plume in the center of the scanned image. Both horizontal and vertical dispersions of SO2 SCD from the crater were successfully measured to be from 1017 to 4.5 × 1018 molecules cm-2. However, BrO was measured below 1015 molecules cm-2, which is considered its background level.
A Survey for 3D Object Detection Algorithms from Images
이한림,김예지,김병규 한국멀티미디어학회 2022 The journal of multimedia information system Vol.9 No.3
Image-based 3D object detection is one of the important and difficult problems in autonomous driving and robotics, and aims to find and represent the location, dimension and orientation of the object of interest. It generates three dimensional (3D) bounding boxes with only 2D images obtained from cameras, so there is no need for devices that provide accurate depth information such as LiDAR or Radar. Image-based methods can be divided into three main categories: monocular, stereo, and multi-view 3D object detection. In this paper, we investigate the recent state-of-the-art models of the above three categories. In the multi-view 3D object detection, which appeared together with the release of the new benchmark datasets, NuScenes and Waymo, we discuss the differences from the existing monocular and stereo methods. Also, we analyze their performance and discuss the advantages and disadvantages of them. Finally, we conclude the remaining challenges and a future direction in this field.
Two-dimensional Measurement of the Prompt-gamma Distribution for Proton Dose Distribution Monitoring
이한림,박종훈,김한성,김찬형,김승훈 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
In proton therapy, accurate monitoring of the in-vivo proton dose distribution is essential in orderto deliver the planned dose to the tumor volume within a minimal safety margin. Recently,a strong correlation between the distributions of the proton dose and the prompt gammas wasfound, and various prompt-gamma distribution-measurement systems, including collimation-basedsystems, Compton cameras, knife-edge imaging systems, and ion vertex imaging systems, have beenproposed. In the present study, the feasibility of proton dose distribution monitoring was testedusing a two-dimensional measurement system for prompt gammas. The measurement system, developedin the present study, incorporates a vertically-aligned one-dimensional array of gamma sensors,a parallel multi-hole collimator, a precision movement system, and a digitizer- and LabVIEW-basedautomatic data acquisition system. A 45-MeV proton beam of 0.5 nA was delivered to a polymethylmethacrylate (PMMA) phantom, and the two-dimensional prompt-gamma distribution was measuredusing the developed system. The proton beam range could be quantitatively determined towithin a 1.6-mm error by sigmoidal curve-fitting with the Boltzmann equation. A comparison of theprompt-gamma distribution as measured by our detection system with the proton dose distributionas measured independently by using Gafchromic EBT films positioned inside the PMMA phantomshowed good agreement. Both results imply that it is, indeed, possible to confirm the patient’sproton dose distribution by using two-dimensional prompt-gamma measurements.
이한림,노영민,류재영,JungBae Hwang,원용관 한국광학회 2011 Current Optics and Photonics Vol.15 No.1
Simultaneous measurements using a scanning spectrograph system and transmissometer were performed for the first time over an urban site in Gwangju, Korea, to derive the ambient NO_2 volume mixing ratio. The differential slant column densities retrieved from the scanning spectrograph system were converted to volume mixing ratios using the light traveling distance along the scanning line of sight derived from the transmissometer light extinction coefficients. To assess the performance of this system, we compared the derived NO_2 volume mixing ratios with those measured by an in situ chemiluminescence monitor under various atmospheric conditions. For a cloudless atmosphere, the linear correlation coefficient (R) between the two data sets (i.e., data derived from the scanning spectrograph and from the in situ monitor) was 0.81; the value for a cloudy atmosphere was 0.69. The two sets of NO_2 volume mixing ratios were also compared for various wind speeds. We also consider the measurement errors, as estimated from an error propagation analysis.