• Title/Summary/Keyword: 3차원 기구

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Evaluation of Two Robot Vision Control Algorithms Developed Based on N-R and EKF Methods for Slender Bar Placement (얇은막대 배치작업에 대한 N-R 과 EKF 방법을 이용하여 개발한 로봇 비젼 제어알고리즘의 평가)

  • Son, Jae Kyung;Jang, Wan Shik;Hong, Sung Mun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.4
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    • pp.447-459
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    • 2013
  • Many problems need to be solved before vision systems can actually be applied in industry, such as the precision of the kinematics model of the robot control algorithm based on visual information, active compensation of the camera's focal length and orientation during the movement of the robot, and understanding the mapping of the physical 3-D space into 2-D camera coordinates. An algorithm is proposed to enable robot to move actively even if the relative positions between the camera and the robot is unknown. To solve the correction problem, this study proposes vision system model with six camera parameters. To develop the robot vision control algorithm, the N-R and EKF methods are applied to the vision system model. Finally, the position accuracy and processing time of the two algorithms developed based based on the EKF and the N-R methods are compared experimentally by making the robot perform slender bar placement task.

Calculation of Virtual Water Trading Between Countries (국가 간 가상수 거래 산정)

  • Park, Sung Je;Kang, In Hye;Park, Jui;Ryu, Si Saeng
    • Proceedings of the Korea Water Resources Association Conference
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    • 2018.05a
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    • pp.210-210
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    • 2018
  • 효과적인 물 사용과 물 관리 정책을 수립하기 위해서는 산업적 차원에서의 물 발자국 연구를 통해 산업 전반적인 수자원 활용 상황을 비교 분석할 필요가 있다. 또한 앞으로 국가 차원의 물 안보 정책을 수립하기 위해서는 기후변화와 국제환경 변화로 인해 우리나라의 물발자국 변화를 예측하는 것이 필수적이다. 국외에서는 일찍이 물과 환경전문 교육기관인 UNESCO-IHE를 중심으로 물발자국 산정방식의 이론적 연구와 함께 가상수 무역에 대한 연구를 진행해왔으며, 국제표준화기구(International Organization for Standardization, 이하 ISO)는 2014년 물발자국에 대한 가이드라인을 국제표준으로 지정하였다. 국내에서는 2009년 가상수와 물발자국에 대한 이론이 소개되어 공공기관의 주도로 가상수 및 물발자국과 관련된 연구가 진행되어 왔다. 이러한 연구결과를 바탕으로 데이터베이스를 구축하기도 하였으나 1차 산업 위주로 구성되어 있어 2차, 3차 산업 등 다른 산업에 대한 정보는 부족한 상태이다. 따라서 앞으로는 2차, 3차 산업 등에 대한 연구가 필요하다. 국제 가상수 거래의 도출을 위한 기초자료로서 WIOD의 input-output tables와 environmental accounts 등을 활용하였다. 본 연구에서는 생산량, 물사용량과 관련된 지표를 결합하여 가상수량을 도출하는 과정을 제시하고, 가상수 이동흐름 및 추이를 분석하였다. 이를 위해 주요 16개국(아르헨티나, 호주, 브라질, 캐나다, 중국, 프랑스, 독일, 인도, 일본, 한국, 러시아, 사우디아라비아, 태국, 미국, 베트남)의 농축산물 주요 10개 품목(쌀, 보리, 옥수수, 밀, 콩, 감자, 채소, 소고기, 돼지고기, 계란)을 대상으로 분석을 실시했다. 또한 국가별 가상수 교역량, 국가 간 가상수 교역량에 대한 1989년부터 2014년까지의 데이터셋을 구축하고 이에 대해 분석을 수행하였다. 가상수 교역의 품목별 분석결과 주요 16개국의 주요 가상수 수입 품목은 콩, 옥수수, 밀, 보리 순이며, 주요 가상수 수출 품목은 밀, 콩, 옥수수, 쌀 순으로 파악되었다. 가상수의 종류별로 분석한 결과 가상수 교역량은 지난 25년간 녹색 가상수가 94%의 압도적으로 많은 비중을 차지하고 있었다. 국가별로 가상수 수출입량을 분석한 결과 1989년에서 2013년까지 미국, 브라질, 아르헨티나, 호주 등 주요 농업 국가들이 전 세계 가상수 수출에서 우위를 점하고 있는 것으로 분석되었다.

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An Analysis of the Policy-Knowledge-Power Dynamics in Higher Education Reform in Transitional Myanmar (전환기 미얀마 정치사회변화와 신(新)고등교육 개혁: 정책·지식·권력의 역동을 중심으로)

  • Hong, Moon-Suk
    • Korean Journal of Comparative Education
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    • v.28 no.3
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    • pp.135-159
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    • 2018
  • This thesis compares and analyzes the dynamics between policy, knowledge and power of Myanmar's higher education development. The papers begins by exploring the dynamics during the Socialist Military Regime(1962~1988), the Collapse of Higher Education Era(1988~2010), Thein Sein's Reform Era(2010~2015) and the current Aung San Suu Kyi's Civilian Era(2015~Now). By highlighting recent dramatic policy changes, the article argues that the policy discourse on the subject of internationalization of higher education and the technocratization of education development policy by the current Civilian Government in its new policy discourse, that resulted in the active participation as well as the contributions of international donors has directly impacted on the policy dynamics around the Comprehensive Education Sector Review and the introduction of the National Education Strategic Plan 2016~2020. Further, by examining complex interaction between the current domestic education stakeholders and international donors in education sector in Myanmar, this thesis argues that the new analytical framework on the understanding of policy dynamics in developing countries goes beyond the national level. The paper argues that there needs to be broadening of the analytical framework towards the multidimensional analysis perspective that includes global, national as well as local level policy, knowledge and power dynamics in Myanmar's dynamically changing higher education sector.

Effect of Solder Structure on the In-situ Intermetallic Compounds growth Characteristics of Cu/Sn-3.5Ag Microbump (Cu/Sn-3.5Ag 미세범프 구조에 따른 실시간 금속간화합물 성장거동 분석)

  • Lee, Byeong-Rok;Park, Jong-Myeong;Ko, Young-Ki;Lee, Chang-Woo;Park, Young-Bae
    • Journal of the Microelectronics and Packaging Society
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    • v.20 no.3
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    • pp.45-51
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    • 2013
  • Thermal annealing tests were performed in an in-situ scanning electron microscope chamber at $130^{\circ}C$, $150^{\circ}C$, and $170^{\circ}C$ in order to investigate the effects of solder structure on the growth kinetics of intermetallic compound (IMC) in Cu/Sn-3.5Ag microbump. Cu/Sn-3.5Ag($6{\mu}m$) microbump with spreading solder structure showed $Cu_6Sn_5$ and $Cu_3Sn$ phase growths and then IMC phase transition stages with increasing annealing time. By the way, Cu/Sn-3.5Ag($4{\mu}m$) microbump without solder spreading, remaining solder was transformed to $Cu_6Sn_5$ right after bonding and had only a phase transition of $Cu_6Sn_5$ to $Cu_3Sn$ during annealing. Measured activation energies for the growth of the $Cu_3Sn$ phase during the annealing were 0.80 and 0.71eV for Cu/Sn-3.5Ag($6{\mu}m$) and Cu/Sn-3.5Ag($4{\mu}m$), respectively.

Implementation of HACCP Model for Steamed Rice with Squid Served from Elementary School with Joint-Lunch Management System (공동관리 초등학교의 안전한 오징어덮밥 생산을 위한 HACCP적용)

  • 박금순;이인숙;금경운
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.33 no.2
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    • pp.365-372
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    • 2004
  • The purpose of this study was to implement HACCP system to foodservice of W and D elementary schools with joint-lunch management system in Kyungsan area. Steamed rice with squid was selected and Control Action, Monitoring Procedure and Control measure were identified based on HACCP flowchart to produce safe and healthy food. It was suggested that frozen squid must be thawed under the cold running city water and kept temperature below 1$0^{\circ}C$ and receiving/thawing procedure has to be done within 30 min. Raw vegetables must be washed under three-tube wash stand and whole prepreparation procedures should be done in 20 minutes. Clean and sanitize all the equipment and utensils before and after handling squid. Knives and cutting boards for vegetable and squid should be classified. Sauce for steamed rice with squid should be heated about 21 minutes to reach the temperature of 94$^{\circ}C$ before serving and internal temperature of food must be kept above 84.4$^{\circ}C$ during serving. The ideal temperature of kitchen should be remained 15∼18$^{\circ}C$. The underground water has to be excluded to minimize the risk of contamination in the foodservice facility and the prepreparation place must be separated with cooking place. Also, Personal hygiene Practice should be check in each stage. Further, additional research needs to be conducted to determine models for HACCP implementation for different menu.

Integrated Geospatial Information Construction of Ocean and Terrain Using Multibeam Echo Sounder Data and Airborne Lidar Data (항공 Lidar와 멀티빔 음향측심 자료를 이용한 해상과 육상의 통합 지형공간정보 구축)

  • Lee, Jae-One;Choi, Hye-Won;Yun, Bu-Yeol;Park, Chi-Young
    • Journal of the Korean Association of Geographic Information Studies
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    • v.17 no.4
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    • pp.28-39
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    • 2014
  • Several studies have been performed globally on the construction of integrated systems that are available for the integrated use of 3D geographic information on terrain and oceans. Research on 3D geographic modeling is also facilitated by the application of Lidar surveying, which enables the highly accurate realization of 3D geographic information for a wide area of land. In addition, a few marine research organizations have been conducting investigations and surveying diverse ocean information for building and applying MGIS(Marine Geographic Information System). However, the construction of integrated geographic information systems for both terrain and oceans has certain limitations resulting from the inconsistency in reference systems and datum levels between two data. Therefore, in this investigation, integrated geospatial information has been realized by using a combined topographical map, after matching the reference systems and datum levels by integration of airborne Lidar data and multi-beam echo sounder data. To verify the accuracy of the integrated geospatial information data, ten randomly selected samples from study areas were selected and analyzed. The results show that the 10 analyzed data samples have an RMSE of 0.46m, which meets the IHO standard(0.5m) for depth accuracy of hydrographic surveys.

A Numerical Study on Characteristics of Smoke Exhaust in Road Tunnel Fires for Different Ventilation System (터널 화재 시 환기 방식에 따른 배연 특성의 수치해석 연구)

  • Kim, Jong-Yoon;Yoo, Ji-Oh
    • Fire Science and Engineering
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    • v.22 no.3
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    • pp.201-207
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    • 2008
  • In this study, three Dimensional CFD simulations were carried out to investigate the effective smoke extraction system in bi-directional road tunnel fires using FLUENT. Characteristics of transverse system with big size extraction port or with uniform extraction port, semi-transverse system and longitudinal system for smoke extraction system were analyzed. Air velocity, port size, and operating method were used with variable. Distributions of smoke spread, CO was analyzed. As a result, the transverse ventilation system with big size port was found to be more effective than the uniform ports for bi-directional road tunnel.

A Study of Local Government's Archives in Beijing, China (중국 북경지역의 구현당안관에 대한 연구)

  • Han, Mi-Kyung
    • Journal of the Korean Society for Library and Information Science
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    • v.48 no.3
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    • pp.411-430
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    • 2014
  • Quxian Archives is the institution collecting, managing and preserving archives and historical materials of each institution, group and individual of pertinent districts and prefectures. This study investigated 16 Quxian Archives in Beijing and surrounding areas in a bid to conduct overseas case study of archives of primary local governments or municipalities. Establishment status, function and organization of Quxian Archives were studied in terms of management. And collection range, method of collection and characteristics of archives in possession were studied in terms of archives of Quxian Archives. Through this study, the construction of informatization of resources of archives and establishment of integrated retrieval system on national level are expected. It is also expected that this will contribute to the establishment of archives of Korea's primary local governments and municipalities, working as one of overseas example of operation.

Key Recommendations for MPA Management in Korea (우리나라 해양보호구역의 효과적 관리를 위한 정책 제안)

  • Chae, Dong-Ryul
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.18 no.3
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    • pp.207-212
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    • 2012
  • The purpose of this paper is to overview Korean MPA, to figure out the problems of current system and to give policy suggestions for effective management for Korean MPAs. Results show that different types of MPAs are established based on different legislations but there is no effective control system for integrated management. In addition, Korean government can not use the function of MPAs due to the insufficient regulation for harmful activities within MPAs. Finally, this paper recommends four policy suggestions for effective management of Korean MPAs; legal requirements of MPA designation, establishment of national authority for MPA management, application of no-take MPAs for fisheries management and establishment of MPA network.

Brief Note On The Radio Navigation Systems In The Sea Around Korea (한국근해에서의 전파항법 적용에 관한 고찰)

  • Song, Moo Young
    • 한국해양학회지
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    • v.14 no.2
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    • pp.78-85
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    • 1979
  • Korea has not any fixed station for Radio Navigation systems yet. In some part of the Korean Sea, however, Japanese stations can be utilized for the Radio Navigation. 3 Decca chains were proposed to install the Decca Navigation network for Korea. Only for the coverage area, 1 Decca chain is sufficient for the sea around Korea instead of 3 chains. At present, Omega system is the most recommendable for the positioning in the farther area. In nearshore area, Raydist or Decca Trisponder is is useful for obtaining the position with high accuracy.

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