• Korean Journal of Agricultural and Forest Meteorology
• /
• v.25 no.2
• /
• pp.99-107
• /
• 2023

Recently, the abnormal weather events and crop damages occurred frequently likely due to climate change. The importance of meteorological data in agricultural research is increasing. Researchers can download weather observation data by accessing the websites provided by the KMA (Korea Meteorological Administration) and the RDA (Rural Development Administration). However, there is a disadvantage that multiple inquiry work is required when a large amount of meteorological data needs to be received. It is inefficient for each researcher to store and manage the data needed for research on an independent local computer in order to avoid this work. In addition, even if all the data were downloaded, additional work is required to find and open several files for research. In this study, data collected by the KMA and RDA were uploaded to GitHub, a remote storage service, and a package was created that allows easy access to weather data using Python. Through this, we propose a method to increase the accessibility and usability of meteorological data for agricultural personnel by adopting a method that allows anyone to take data without an additional authentication process.

• Journal of Aerospace System Engineering
• /
• v.13 no.6
• /
• pp.52-59
• /
• 2019

The rotor blade is a key component that generates the lift, thrust, and control forces required for helicopter flight by the torque transmitted through the hub and the blade pitch angle control, and should be designed to factor vibration characteristics so that there is no risk of resonance with structural safety. In this study, the structural design of the main rotor blade for MPUH(Multi-Purpose Unmanned Helicopter) was conducted and the sectional stiffness measurement of the fabricated blade was performed. The evaluation of the vibration characteristics of the main rotor system was then conducted factoring the measured stiffness distribution. The interior of the rotor blade comprised of the skin, spar, and torsion box, and carbon and glass fiber composites were applied. The Ksec2D program was applied to predict the stiffness of blade, and the results were compared to the measured data. CAMRADII, a comprehensive rotorcraft analysis program, was applied to investigate the natural frequency trends and resonance risks due to the rotor rotation.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.52 no.5
• /
• pp.106-114
• /
• 2015

Wireless Body Area Network(WBAN) is a network standard around a human body which connects various medical sensor and devices It has to satisfy various demands such as data transmission rate, priority, and delay time. In this paper, considering a data priority and transmission delay time, is proposed to improve efficiency of WBAN service depending on congestion status of network. The proposed algorithm operates with adapted data removal probability according to data priority when the hub buffer is congested than before. And in the case of lower congestion within the hub buffer data is served considering data delay time. Through the comparison with other existing scheduling algorithms, it is confirmed that quality of WBAN service is improved due to lower data loss rate of medical data and less delay time in the proposed algorithm.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.38 no.10
• /
• pp.955-965
• /
• 2010

The MH-75 propeller for the MAV propulsion is designed using a free vortex design method which considers design parameters such as the hub-tip ratio, the twist angle distribution, the maximum camber location and the chord length of the propeller blade. Aerodynamic characteristics of the MH-75 propeller are predicted by changing the flight speed using the frequency domain panel method. And, the thrust characteristics of the MH-75 propeller are measured using the balance system of the subsonic wind tunnel for the validation of numerical results. The performance characteristics of the MH-75 propeller satisfied with design requirements. Numerical results of the MH-75, which are predicted by the frequency domain panel method, are more agree with experimental results compare with XFOIL.

• The Inventors News
• /
• no.53
• /
• pp.1-16
• /
• 2006

'여성기업지원에 관한 법률' 개정 한 목소리/발행인 칼럼/'제4회 여성발명경진대회' 수준 높아졌다/심사착수 예정시기 직접 통지 서비스 실시/특허청.한국기계연구원, 업무협약체결/낙도어린이들에게 꿈과 희망 심어주는 초청 행사 가져/특허청 팀장 선발 방식 변화 통한 팀제 강화/디자인 권리화 지원사업 실시한다/'DMB 특허품과 지재권전략 세미나'/'2006 독일 국제발명품 전시회' 회원 4명 수상/고성능 하이브리드 보호복, 출원 증가/'이달의 기능 한국인' 박순복 씨 선정/모방상표, 더 이상 등록 받을 수 없다/국내제약업계, 유사브랜드 너무많아/'2006 여성 재활용 발명경진대회' 개최/순수 한방재료로 만든 헤어 클리닉 화제/발명자에게 편리한 특허제도 마련/차로 마시는 '허브 추출물'로 살충제 만들어/종이컵에도 웰빙 바람이 불고 있다/특허공보 통해 '나의 발명' 확인가능/지역특산품도 지리적 표시로 보호 받는다/한미약품,'비만치료제 특허권 분재' 연승/국내특허, 해외에서 신속하게 심사 처리/'스판덱스 특허소송'에서 일본업체 패소/아모레, 다국적 화장품회사 로레알에 승소/제7차 한국.유럽 특허청장 회담 개최/고부가가치 창출하는 단백질 의약품 개발 필요/한방 진료에도 변화의 새바람 분다/에너지 절감'기능성 유리' 출원 급증/역사 속의 발명품/하루 10분 발명교실/특허Q&A/세상을 밝히는 여성들의 발명 아이디어/'특허넷' 정부기관 최초 CMMI 레벨4인증 획득/'해외지재권 보호 가이드북' 제작배포하다/아이디어 착상 및 발명 기법/고정관념을 깨트려 블루오션을 장악하라/에반스의 증기제분기/50년 후엔 동물과도 대화할 수 있다/첩보용 도구 전달 '발명팀' 실제 존재/중소기업 위한'2006 특허유통 페스티벌' 개최/출원료.심사청구료 반환제도 도입, 시행/'지재권 e-러닝 콘텐츠' 전 세계특허청 교육 자료로 활용/대한변리사회, 미 특허법 세미나 개최/한국여성발명협회 회원사 발명품 가이드

• Journal of Korean Society of Transportation
• /
• v.32 no.2
• /
• pp.162-169
• /
• 2014

This study dealt with the airport network applying the Structural Equivalence which has used in the field of social science network. It analyzed the size of aviation market and trade exchanges. The results between blocks through the Convergence of Iteration Correlation are as follows; Block 1 (major hub airport) and Block 5 (Australian and New Zealand airports) have a strong relationship between other blocks. Block 3 (CIS region) and Block 7 (Malaysia and Indonesia) have been indicated as relatively low degree. The structural equivalence analysis can be grouped as a small number of blocks with large and complex networks and also presented a significant result according to the nature of the relationship between aviation market and the level of trade exchanges.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.35 no.10
• /
• pp.891-898
• /
• 2007

Optimal aerodynamic design for the pitch-controlled horizontal axis wind turbine and its aerodynamic performance for various pitch angles are performed numerically by using the blade element momentum theory. The numerical calculation includes effects such as Prandtl‘s tip loss, airfoil distribution, and wake rotation. Six different airfoils are distributed along the blade span, and the special airfoil i.e. airfoil of 40% thickness ratio is adopted at the hub side to have structural integrity. The nonlinear chord obtained from the optimal design procedure is linearized to decrease the weight and to increase the productivity with very little change of the aerodynamic performance. From the comparisons of the power, thrust, and torque coefficients with corresponding values of different pitch angles, the aerodynamic performance shows delicate changes for just $3^{\circ}$ increase or decrease of the pitch angle. For precisive pitch control, it requires the pitch control algorithm and its drive mechanism below $3^{\circ}$ increment of pitch angle. The maximum torque is generated when the speed ratio is smaller than the designed one.

• Journal of Korea Port Economic Association
• /
• v.26 no.1
• /
• pp.20-42
• /
• 2010

This study is aimed at evaluating transshipment competitiveness of Incheon New Port which will open in 2013. For this reason, we used Conjoint Analysis(CA) for a methodology of this research as CA had been frequently adopted for empirical analysis of new container terminal in previous studies. We have provided the questionnaires to the stake holders of the port such as experts in Port Authority(PA), logistics companies, and terminal operators. The result showed that transshipment competitiveness of Incheon New Port was subordinate to transshipment costs and port costs of Busan and Shanghai. Overall, we hope this study could help draw up the policies on a New Port that will attract transshipment cargoes and set up marketing plan for an early settlement.

• Journal of Information Technology and Architecture
• /
• v.11 no.1
• /
• pp.53-62
• /
• 2014

The research tries to find appropriate nations and cities of the international supporting centers according to Korean firms' requests. It also tries to find out proper designs of governance structure and strategic and operational control system of the center. Two methods are used to find out Korean firms' requests. One is the expert interviews and the other is the questionnaire survey. The email survey is sent to 120 firms of IT service, package software, telecom facilities and broadcasting equipment industries. Their opinions in addition to interview results are used as a basis of selecting potential regions for new centers and types of their services. According to survey results, southeast asia is the most preferred region and Indonesia, Vietnam, Thailand, Malaysia and Singapore are selected as potential nations for a location of the center in southeast asia. However, the survey result is not fully agreed with the interviewees' opinions. The interviewees tell that there are not much demand in nations with low purchasing power and low IT industry level. That is, Indonesia and Vietnam are not proper places for the centers.

• Journal of Korean Society of Forest Science
• /
• v.104 no.3
• /
• pp.454-465
• /
• 2015

This research analyzed characteristics of networks among stakeholders related to forest trail management. Results of analysis showed that Jiri way and Uljin trail had council-led network. As both trails were supported by government, the government had much power to make decisions and manage trail. But parts that mediated differences of interests among various stakeholders were insufficient. To manage forest trails effectively, it is necessary that hub organization which can have networks and make decision considering different interests have to develop and it have to authorize hub organization to take a right role for management of forest trails.