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움직이는 물체의 탐지에 있어서 대비 감민도와 시력의 역할
박창호,이상훈,김정오 서울大學校 社會科學大學 心理科學硏究所 1993 心理科學 Vol.2 No.-
본 연구의 두 실험들은 정현과 격자무늬(sine wave gratings) 자극패턴들을 사용하여 시력과 대비감민도가 정지된 물체나 그 크기가 시간에 걸쳐 변하는 물체의 탐지에 미치는 상대적 영향을 검토하였다. 두 실험에 걸쳐 일관된 결과는 적어도 렌돌트 링 표준시력검사로 측정된 사람의 시력이 물체의 비교나 크기 판단반응의 속도나 정확성에 아무런 영향을 미치지 않음을 보여주었다. 이와는 대조적으로 판단해야할 물체를 이루는 공간빈도와 대비 수준이 사람들의 수행에 체계적으로 영향을 미쳤다. 실험 1에서는 두 비교 패턴의 공간빈도가 2일 때 동일 판단을 내리는 반응시간이 가장 느렸다. 실험 2에서는 크기가 시간에 따라 달라지는 정현파 격자무늬에 있어 특정 크기를 탐지할 때 공간빈도가 4인 경우가 다른 자극 조건들에 비해 더 느린 탐지반응 시간을 보였다. 이러한 결과들은 종합적으로 정적 물체이든 동적 물체이든 시력과는 무관하게 대비감민도가 매우 중요함을 보여준다. Using sinewave gratings varied in contrast and spatial frequency, two experiments explored relative effects of contrast sensitivity and visual acuity on detecting either stationary or moving targets. Visual auity, as measured by a Landolt Ring test, did not affect the subjects' decision times and accuracy, whereas spatial frequency and contrast did. For the same response, the longest reaction time was observed for the sinewave gratings of 2 cycles per degree. When the subjects were required to detect sinewave gratings whose size changed over time, those gratings of 4 cycles per degree showed the slowest reaction times. The pattern of results of two experiments indicate that regardless of visual acuity, the subjects' contrast sensitivity is very important in detecting various objects, be they moving or not.
EGFR 돌연변이와 ROS1 전위를 동시에 가진 폐선암 환자의 Erlotinib 치료 1예
김민환,박예현,박혜정,지아영,송창호,진무년,김영주,김선욱,이중희,김인수,김혜련,김주항,조병철 Ewha Womans University School of Medicine 2014 EMJ (Ewha medical journal) Vol.37 No.1
The rearrangement of c-ros oncogene 1 (ROS1) has been recently identified as an important molecular target in non small cell lung cancer (NSCLC). ROS1 rearrangement and epidermal growth factor receptor (EGFR) mutation were mutually exclusive each other in previous studies, and the clinical implication of co-existence of the two genetic alterations has not been determined. We report a case of 46-year-old female never-smoker NSCLC patient whose tumor harbored ROS1 rearrangement and EGFR mutation concomitantly. She had undergone curative surgery for stage IIIA NSCLC, and the recurrence in left pleura and brain occurred at 2 years after the surgery. She received several lines of chemotherapy including docetaxel plus carboplatin, erlotinib, pemetrexed, and gemcitabine. Erlotinib therapy showed a favorable treatment response with progression-free survival of 9.5 months and partial response of tumor on radiologic evaluations. This case represents a successful erlotinib treatment in a NSCLC patient with concurrent ROS1 rearrangement and EGFR mutation.
정창호(Changho Jung),박일환(Ilhwan Park) 한국정보보호학회 2008 정보보호학회논문지 Vol.18 No.a6
본 논문은 최근 많이 사용되는 64-비트 프로세서인 Intel Core2 프로세서와 AMD Athlon64 프로세서에서 AES 알고리즘을 고속 구현하는 기법을 제시한다. 먼저 EM64T 아키텍처의 Core2 프로세서는 메모리 접근 명령어 처리 효율이 연산명령어 처리 효율보다 떨어진다. 때문에 메모리 접근 명령어의 비율이 높게 구성된 기존 AES 구현기법은 메모리 병목현상이 발생된다. 이에 메모리 접근 명령어 비율을 낮춘 부분 라운드키 기법을 제시한다. ECB 모드로 구현한 결과 Core2Duo 3.0 Ghz 프로세서에서 185 cycles/block, 2.0 Gbps의 성능을 보여주었다. 이 결과는 가장 빠르다고 알려진 bernstein 코드보다 35 cycles/block 빠르다. 한편 AMD64 아키텍처의 Athlon64 프로세서에서는 명령어 디코딩 과정에서 발생하는 병목현상을 제거하므로써 속도를 향상시켰다. 그 결과 Athlon64 프로세서에서 170 cycles/block의 성능을 나타났다. 이는 가장 빠르다고 알려진 Matsui의 비공개 코드와 성능이 동일하다. This paper suggests a new way to implement high speed AES on Intel Core2 processors and AMD Athlon64 processors, which are used all over the world today. First, Core2 Processors of EM64T architecture's memory-access-instruction processing efficiency are lower than calculus-instruction processing efficiency. So, previous AES implementation techniques, which had a high rate of memory-access-instruction, could cause memory-bottleneck. To improve this problem we present the partial round key techniques that reduce the rate of memory-access-instruction. The result in Intel Core2Duo 3.0 Ghz Processors show 185 cycles/block and 2.0 Gbps's throughputs in ECB mode. This is 35 cycles/block faster than bernstein software, which is known for being the fastest way. On the other side, in AMD64 processors of AMD64 architecture, by removing bottlenecks that occur in decoding processing we could improve the speed, with the result that the Athlon64 processor reached 170 cycles/block. The result that we present is the same performance of Matsui's unpublished software.
( Dae Hyun Jung ),( Hak-jin Kim ),( Jung-seok Yang ),( Ju Young Lee ),( Hyoung Seok Kim ),( Soo Hyun Park ),( Changho Jhin ),( Teak Sung Lee ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
The most widely used soilless techniques are container cultivation which uses a substrate that contains the nutrient solution and continuously feed to the root of the crop. Since the roots are influenced by the substrate parameters such as the water content, the electrical conductivity, and the temperature, The nutrient replenishment and irrigation strategies need to monitor the substrate status. The main objective of this work has been the development of estimation models of EC, water content, and temperature in rockwool substrate using artificial neural network based on Levenberg-Marquardt back-propagation algorithm. We set the 17 inputs for learning by collecting the irrigation and nutrient replenishment status from the hydroponic system, data from drainage solution sensors, the environmental data in the greenhouse, the output data were collected through sensors monitoring substrate. These data for training were measured every 30 s from February 04 to April 03, 2018, training accuracy (R<sup>2</sup>) of three output values were greater than 0.96. The trained neural network models predicted the substrate EC, water content and temperature of test samples, which is randomly selected for 5 days. Test accuracy (R<sup>2</sup>) was 0.92, 0.89 and 0.85 and RMSE was 1.57, 0.07 and 0.45 for water content, EC, temperature, respectively. This method can be used online in tomato cultivation to not only decrease costs related to the installation of sensors but to also make a precise nutrient solution management.
Sterovision-based Guidance Line Detection Method on a Field With Ridge-furrow for Autonomous Tractor
( Changho Yun ),( Hak-jin Kim ),( Chan-woo Jeon ),( Jung-hun Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Furrow irrigation, which is conducted by creating parallel channels along the field length, is a cultivation method widely used for growing many row crops such as hot pepper, garlic, soybean and tree crops. These artificially structured parallel channels, commonly referred to as ridge-furrow, can provide guidance to autonomous tractors with its characteristic of undulating surface. This study reports the development of a stereovision-based guidance line detection system (SGLDS) applicable to ridge-furrow cropping fields. The algorithm implemented in the detection system consisted of two different phases, i.e., splitting depth images into two parts (ridge and furrow) and extracting a guidance line from the split images. Through the image binarization method based on distance transform and image segmentation, the depth image was divided into two regions of ridge and furrow and the boundary points of each region were then detected. The second phase extracted a guidance line from the detected boundary points based on linear regression. The guidance line detected by the developed algorithm was compared to manually labelled guidance line, and the result was RMSs of 0.02 m and 0.63 deg in lateral deviation and heading angle, respectively. Further, the stereo camera was installed on a tractor and field tests were proceeded on a straight and regularly spaced ridge and furrow field. As a result, the RMS of lateral deviation measured by a RTK-GPS was 1.37 cm at 3km/s.