• Title/Summary/Keyword: 도달시각

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Implementation of Autonomous Mobile Wheeled Robot for Path Correction through Deep Learning Object Recognition (딥러닝 객체인식을 통한 경로보정 자율 주행 로봇의 구현)

  • Lee, Hyeong-il;Kim, Jin-myeong;Lee, Jai-weun
    • The Journal of the Korea Contents Association
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    • v.19 no.12
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    • pp.164-172
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    • 2019
  • In this paper, we implement a wheeled mobile robot that accurately and autonomously finds the optimal route from the starting point to the destination point based on computer vision in a complex indoor environment. We get a number of waypoints from the starting point to get the best route to the target through deep reinforcement learning. However, in the case of autonomous driving, the majority of cases do not reach their destination accurately due to external factors such as surface curvature and foreign objects. Therefore, we propose an algorithm to deepen the waypoints and destinations included in the planned route and then correct the route through the waypoint recognition while driving to reach the planned destination. We built an autonomous wheeled mobile robot controlled by Arduino and equipped with Raspberry Pi and Pycamera and tested the planned route in the indoor environment using the proposed algorithm through real-time linkage with the server in the OSX environment.

(Visualization Tool of searching process of Particle Swarm Optimization) (PSO(Particle Swarm Optinization)탐색과정의 가시화 툴)

  • 유명련;김현철
    • Journal of the Institute of Convergence Signal Processing
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    • v.3 no.4
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    • pp.35-41
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    • 2002
  • To solve the large scale optimization problem approximately, various approaches have been introduced. They are mainly based on recent research advancement of simulations for evolutions, flocking, annealing, and interactions among organisms on artificial environments. The typical ones are simulated annealing(SA), artificial neural network(ANN), genetic algorithms(GA), tabu search(TS), etc. Recently the particle swarm optimization(PSO) has been introduced. The PSO simulates the process of birds flocking or fish schooling for food, as with the information of each agent Is share by other agents. The PSO technique has been applied to various optimization problems of which variables are continuous. However, there are seldom trials for visualization of searching process. This paper proposes a new visualization tool for searching process particle swarm optimization(PSO) algorithm. The proposed tool is effective for understanding the searching process of PSO method and educational for students.

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Crustal Structure of the Korean Peninsula By Travel Time Inversion of Local Earthquakes

  • Song, Seok-Gu;Lee, Gi-Hwa
    • Journal of the Korean Geophysical Society
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    • v.4 no.1
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    • pp.21-33
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    • 2001
  • Simultaneous inversion of first-arrivals of local earthquakes recorded by the Korea Meteorological Administration(KMA) seismograph network from 1991 to 1998 is made to derive 1D crustal velocity structure of the Korean peninsula. Twenty-nine events with 178 observations are used in the inversion. Average crustal P-wave velocity turns out to be about 6.3 km/sec, and crustal thickness and upper mantle P-wave velocity are estimated as 33 km and 7.9 km/sec, respectively. Results of inversion indicate the possibility of the low velocity layer in the lower crust. Joint inversion is applied to estimate hypocenters, station delays, and velocities simultaneously. Relative station corrections for 11 stations range from zero to about 1.2 sec. Analysis of the synthetic data shows that estimates of hypocenter locations and station corrections as well as averaged crustal structure are reliable for the given data set..

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A Study on the Retrievals of Downward Solar Radiation at the Surface based on the Observations from Multiple Geostationary Satellites (정지궤도 위성자료를 이용한 지표면 도달 태양복사량 연구)

  • Jee, Joon-Bum;Zo, Il-Sung;Lee, Kyu-Tae
    • Korean Journal of Remote Sensing
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    • v.29 no.1
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    • pp.123-135
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    • 2013
  • The reflectance observed in the visible channels of a geostationary meteorological satellite can be used to calculate the amount of cloud by comparing the reflectance with the observed solar radiation data at the ground. Using this, the solar radiation arriving at the surface can be estimated. This study used the Meteorological Imager (MI) reflectance observed at a wavelength of 675 nm and the Geostationary Ocean Color Imager (GOCI) reflectance observed at similar wavelengths of 660 and 680 nm. Cloudy days during a typhoon and sunny days with little cloud cover were compared using observation data from the geostationary satellite. Pixels that had more than 40% reflectance in the satellite images showed less than 0.3 of the cloud index and blocked more than 70% of the solar energy. Pixels that showed less than 15% reflectance showed more than 0.9 of the cloud index and let through more than 90% of the solar energy to the surface. The calculated daily accumulated solar radiation was compared with the observed daily accumulated solar radiation in 22 observatories of the Korean Meteorological Administration. The values calculated for the COMS and MTSAT MI sensors were smaller than the observation and showed low correlations of 0.94 and 0.93, respectively, which were smaller than the 0.96 correlation coefficient calculated for the GOCI sensor. The RMSEs of MTSAT, COMS MI and GOCI calculation results showed 2.21, 2.09, 2.02 MJ/$m^2$ in order. Comparison of the calculated daily accumulated results from the GOCI sensor with the observed data on the ground gave correlations and RMSEs for cloudy and sunny days of 0.96 and 0.86, and 1.82 MJ/$m^2$ and 2.27 MJ/$m^2$, respectively, indicating a slightly higher correlation for cloudy days. Compared to the meteorological imager, the geostationary ocean color imager in the COMS satellite has limited observation time and observation is not continuous. However, it has the advantage of providing high resolution so that it too can be useful for solar energy analysis.

Lee Je-ma's point of view on the shape and image (동무(東武) 이제마(李濟馬)의 형상관(形象觀)에 대한 고찰(考察))

  • Choi, Young-hee;Park, Seong-sik
    • Journal of Sasang Constitutional Medicine
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    • v.11 no.1
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    • pp.271-279
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    • 1999
  • 1. Purpose : From a viewpoint of Lee Je-ma, We consider the principle of shape(form) and image and try out a share of recognition about shape(form) and image in all its aspects. 2. Method : Especially we compared HeoJun's point of view with Lee Je-ma's point of view. 3. Result & Conclusion 1) The most important thing for an appearance of shape(form) and image is a differential Qi of sorrow- anger-joy-pleasure. 2) Lee Je-Ma chose a point of view from inside to outside in principle. 3) A method of materialism can be used when we give medical treatment. 4) Shape(form) and image is a method of constitutional diagnosis from a viewpoint of Lee Je-ma. 5) Shape(form) and image has a formal(typical) type, but the thing which is fixed do not exist, therefore partial shape(form) and image is possible. 6) We should observe a condition of mind, but objectivity and reappearance always remain.

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Study on Physiological Summation in Peripheral Retina for Eccentric Viewing Training (중심외주시 훈련용 주변부 망막의 생리적 가중에 관한 연구)

  • Seo, Jae-Myoung;Lee, Ki-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.18 no.4
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    • pp.489-493
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    • 2013
  • Purpose: This study was to investigate peripheral vision and provide people with macular degeneration with a guideline for eccentric viewing training. Methods: 30 adult subjects with normal vision took part in this study. The lateral area of $20^{\circ}$ eccentricity from the fovea of right eye was only used to measure the physiological summation. The target was sinusoidal vertical gratings within a circular aperture. The critical points in spatial and temporal summation was found to compare each other for 0.7 cpd and 3.0 cpd, respectively. Results: Critical duration and contrast sensitivity for 0.7 cpd were 540 ms and 1.1, and 315 ms and 0.98 for 3.0 cpd respectively. The critical degrees and contrast sensitivity for 0.7 cpd were $11.3^{\circ}$ and 2.8, and $5^{\circ}$ and 2.63 for 3.0 cpd respectively. Conclusions: The critical point in peripheral vision reaches relatively faster than the one in central vision. It is recommended to train the peripheral retina under the lower spatial frequency more frequently for a short time than constantly for a long time.

Study for the meaning of facade as media (디지털영상으로써 미디어파사드의 매체적 의미성 연구)

  • Lee, Jong Han
    • Cartoon and Animation Studies
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    • s.31
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    • pp.209-226
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    • 2013
  • With rapidly changing multimedia environment, various artistic changes and digitalized up-to-date social infra, urban environment construction based on culture contents has been activated. The large image in front of urban building that is expressed as media-façade, increasing rapidly in a recent period, is not a new thing at all. In addition, IT technology molten in city space is testing the possibility of new media through the meeting with architecture. However, unlike its infra enlargement, the definition about media-façade is not clear so the system was constructed in a level of night lightscape or outdoor image advertisement. The purpose of this guideline is the regulation from the negative aspect rather than the possibility of various visual, artistic media expressions. Therefore, it could not show essential concept of media-façade. Moreover, most of companies or building owners focus on short-term profit and marketing effect rather than prepare various contents so they can not use constructed infra properly. After all, in many cases, they discolor the meaning of media-façade. This paper is a pilot study to grasp the current definition of media-façade to construct right guideline of media-façade. On the basis of this study, it will prepare academic definition of media-façade and construct the guideline for design evaluation.

THE MEASUREMENT OF THE IONOSPHERIC TOTAL ELECTRON CONTENT USING P-CODE OF GPS (GPS의 P 코드를 이용한 이온층의 총전자수 측정)

  • 서윤경;박필호;박종욱;이동훈
    • Journal of Astronomy and Space Sciences
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    • v.11 no.1
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    • pp.71-80
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    • 1994
  • It is generally known that the measurement of the ionospheric total electron content(TEC) by GPS can more accurately monitor the broader area of the ionosphere than other current methods. \Ve measured the TEC along a slant path considering the arrival time differences of P-code which is transmitted from GPS satellites with the modulation on two L-band carrier frequencies, L1 (1574.42MHz) and L2 (1227.60MHz). Under the assumptions that the ionosphere is uniformly distributed and its average height is 350km, we transformed the slant TEC to the vertical TEC at the point that the line-of-sight direction to GPS satellite cut across the average height of the ionosphere. Because there is no dual frequency P-code GPS receiver in Korea, we used the data observed at the TAIW GPS station ($N25^{\circ},E121.5^{\circ}$) in Taiwan which is one of the core stations in International GPS and Geodynamics Services (IGS). The TEC values obtained in this work showed a typical daily variation of the ionosphere which is high in the daytime and low in the nighttime. Our results are found to be consistent with the SOLAR-DAILY data of NOAA and the Klobuchar's model for the ionospheric correction of GPS. In addition, in the cornparision with SOLAR-DAILY data, we estimated the precision of our TEC measurement as 2 TEC.

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Contents Development Related to Costume Culture in Traditional Intangible Cultural Properties -The Modernization of Costume Design in Dongraeyaryu- (전통무형문화재의 복식문화컨텐츠 개발 -동래야류 의상 디자인의 현대화 작업)

  • Kim, Soon-Ku
    • Archives of design research
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    • v.17 no.4
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    • pp.251-258
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    • 2004
  • Today we seem to be flooded with digital culture as the age of information has reached its peak. As fusion culture has been generalized, in which the arts and culture of the East and the West are in harmony, and quality of life has been improved, people are enjoying more abundant cultural benefits than ever. In such a situation, we may lose the origin of our culture and disregard our traditional culture due to the mixture of cultures. In addition, it is necessary at this point to distinguish pure culture from mixed one and to re-illuminate the value of our original culture for the next generation. Therefore, the author took interested in Dongraeyaryu, a large-scale festival in Busan, which has been designated as an important intangible cultural property, and carried out a research for its continuous instruction and activation. among contents such as music, costume, dancing and stage properties that compose intangible cultural property, this study selected costume, which has significant visual effects and large differences in shape between old one and contemporary one, for development. By proposing modernized design of costume preferred by the new generation and in harmony with the masks, this study wished to narrow the generation gap, to direct young people's attention to the learning of tradition and to propose motives that activate the culture of local festival.

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Streptococcus thermophilus K-1 및 Lactobacillus acidophilus LB12 균주에 있어 최대 Exopolysaccharide 생산에 영향을 미치는 물리적 원인 규명을 위한 연구

  • 강현미;엄양섭;정충일
    • Proceedings of the Korean Society of Food Hygiene and Safety Conference
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    • 1999.10a
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    • pp.119-119
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    • 1999
  • EPS를 생성하는 Str. thermophilus K-1 및 Lb. acidophilus LB12를 10% 환원 탈지유에 배양하고, EPS 생산을 위한 배지로는 Elliker broth를 사용하여 20, 25 및 $37^{\circ}C$에서 72시간까지 저장하면서 12시간 간격으로 시료를 꺼내어 EPS생산량, 생균수, 산도 및 점도 등을 측정하여 EPS생산과 이들 물리저 요인들과의 상호관계를 조사하였다. Str. thermophilus K-1의 경우, $20^{\circ}C,\;37^{\circ}C$에 저장한 시료의 EPS 생산량은저장 60시간에 각각 0.358, 0.386O.D.로 최대를 나타내었으며, 저장 72시간에는 다소 감소하는 것으로 나타났다. $25^{\circ}C$에 저장한 시료는 저장 36시간부터 O.D. 0.313으로 급속히 증가하여 72시간까지 그 수준을 거의 유지하는 것으로 나타났다. Lb. acidophilus CH-2의 경우에는 25, $37^{\circ}C$에서는 EPS생산이 서서히 증가하다가, 36, 48시간에 0.775, 0.833O.D.로 각각 최대를 나타낸 후에 다시 서서히 감소하는 것으로 나타났으며, 저장 $20^{\circ}C$에서는 저장 60시간에 1.123O.D.로 EPS생산이 최대에 도달한 후 저장 72시간에는 다시 감소하는 것으로 나타났다. 이 두균주의 세 가지 배양 온도에서 EPS가 최대를 나타내는 시점은 생균수가 감소하는 시점과 일치하므로, 균주 및 배양온도에 상관없이 균성장 말기 또는 균사멸기 초기에 EPS가 가장 많이 생산됨을 알 수 있었다. 또한 점도 및 산도는 저장 온도가 높을수록, 그리고 저장 기간이 길어질수록 대체로 많이 생성되는 것으로 나타났으며, EPS생산과의 유의성도 상당히 높은 것으로 나타났다. 것들이 부딛힘이 없이 공존하고 일상의 논리가 무시된다. 부정, 의심이 없고 확실한 것이 없다. 한 대상에 가졌던 생각이 다른 대상에 옮겨간다(displacement). 한 대상이 여러 대상이 갖고 있는 의미를 함축하고 있다(condensation). 시각적인 순서가 무시된다. 마음속의 생각과 외부의 실제적인 일을 구분하지 못한다. 시간 상의 순서가 있다가 없다가 한다. 차례로 일어나야 할 일이 동시에 한꺼번에 일어난다. 대상들이 서로 비슷해지고 동시에 있을 수 없는 대상들이 함께 나타난다. 사고의 정상적인 구조가 와해된다. Matte-Blance는 무의식에서는 여러 독립된 대상들간의 구분을 없애며, 주체와 객체를 하나로 보려는 대칭화(symmetrization)의 경향이 있기 때문에 이런 변화가 생긴다고 하였다. 또 대칭화가 진행되면 무한대의 느낌을 갖게 되어, 전지(moniscience), 전능(omnipotence), 무력감(impotence), 이상화(idealization)가 나타난다. 그러나 무의식에 대칭화만 있는 것은 아니며, 의식의 사고양식인 비대칭도 어느 정도 나타나며, 대칭화의 정도에 따라, 대상들이 잘 구분되어 있는 단계, 의식수준의 감정단계, 집단 내에서의 대칭화 단계, 집단간에서의 대칭화 단계, 구분이 없어지는 단계로 구분하였다.systems. We believe that this taxonomy is a significant contribution because it adds clarity, completeness, and "global perspective" to workflow architectural discussions. The vocabulary suggested here includes workflow levels and aspects, allowing very different architectures to be discussed,