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박신우 ( Shin-woo Park ),조현민 ( Hyun-min Joe ) 한국센서학회 2024 센서학회지 Vol.33 No.1
Humanoid robots, designed to interact in human environments, require stable mobility to ensure safety. When a humanoid robot falls, it causes damage, breakdown, and potential harm to the robot. Therefore, fall detection is critical to preventing the robot from falling. Prevention of falling of a humanoid robot requires an operator controlling a crane. For efficient and safe walking control experiments, a system that can replace a crane operator is needed. To replace such a crane operator, it is essential to detect the falling conditions of humanoid robots. In this study, we propose falling detection methods using Convolution Neural Network (CNN) model. The image data of a humanoid robot are collected from various angles and environments. A large amount of data is collected by dividing video data into frames per second, and data augmentation techniques are used. The effectiveness of the proposed CNN model is verified by the experiments with the humanoid robot MAX-E1.
평등전계에서 SF<sub>6</sub>/CF<sub>4</sub> 혼합가스의 AC절연내력 특성
황청호,박신우,김남렬,허창수,Hwang, Chung-Ho,Park, Woo-Shin,Kim, Nam-Ryul,Huh, Chang-Su 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4
The excellent dielectric properties of $SF_6$(sulfur hexafluoride) have lead to its wide range of application in the field of high voltage insulation. Because there has been some recent concern regarding the environmental impacts of $SF_6$ binary gas mixtures, with $SF_6$ as the main component, have been the subject of active research. Scientists have long been interested in the possible use of gaseous fluorocarbons, including $CF_4$ (Carton Tetrafluoride), in high voltage applications due to their inert character and high dielectric strength. This paper presents experimental results concerning the AC breakdown characteristics lot various mixtures of $SF_6/CF_4$ in a test chamber and 25.8 kV GIS (Gas Insulation Switchgear) at practical pressures (0.1-04 MPa) and gap lengths (0.5 mm, 1 mm) in a test chamber. In the result, it was observed that an increase in the dielectric strength is attained through the addition of $SF_6$ to $CF_4$. It is possible to make an environment friendly gas insulation material while maintaining the dielectric strength by combing $SF_6$ and $CF_4$ which generates a lower level of the "global warming" effect.
초대형 컨테이너 선박의 생산성 및 효율성 분석 -부산항을 중심으로-
김정훈(Jong-Hoon Kim),류원형(Won-Hyeong Ryu),박신우(Shin-Woo Park),남형식(Hyung-Sik Nam) 한국항해항만학회 2023 한국항해항만학회 학술대회논문집 Vol.2023 No.1
컨테이너를 이용한 해상운송이 본격적으로 시작되면서 컨테이너선의 크기는 꾸준히 증가하고 있으며 최근에는 24,000TEU급 선박의운항이 일반화되어 있다. 하지만, 최근 이러한 초대형 컨테이너 선박의 등장에 따른 효율성 및 생산성이 항만의 운영 관점에서 타당한지에 대한 의문도 지속적으로 제기되고 있다. 2022년 제10회 부산국제항만컨퍼런스에서는 글로벌 주요 정기선사들의 초대형 컨테이너 선박의 발주 현황을 분석하여 소강상태에 접어든 컨테이너 선박의 대형화 추세에 대한 심층적인 연구를 요구하였다. 일반적으로 선박 대형화 요인은 TEU당운송 비용을 낮추는 규모의 경제 실현이며 이는 단일선박으로 대량의 화물을 수송함으로써 단위당 운송비용의 절감과 운송의 효율증가에 비해연료 소모량의 증가가 낮아 단위당 운송비용의 절감 수준이 높아지기 때문이다. 하지만, 과연 항만의 측면에서 이러한 컨테이너 선박의 대형화추세가 항만 운영에 있어서 타당성을 지니고 있는지에 대한 검토가 필요하다. 이를 위해 본 연구에서는 선형별 생산성 및 효율성을 비교·분석하여 항만 운영에 있어 선박 대형화의 효과를 평가한다. As containerized maritime transport began in earnest, the size of container ships has steadily increased, and recently, the operation of 24,000 TEU-class vessels has become regular. However, concerns about the efficiency and productivity of such mega container ships from a port operational perspective have continued to be raised. The 10th Busan International Port Conference requested an in-depth study on the trends of container ship enlargement by analyzing the order status of ultra-large container ships from major global liners. Generally, the factor that drives the upsizing of ships is the realization of economies of scale that lowers transportation costs per TEU, which leads to a higher level of cost reduction per unit transportation compared to the increase in fuel consumption due to transporting large amounts of cargo with a single ship. However, it is necessary to examine whether this trend of container vessel enlargement is feasible for port operations. To this end, this study compares and analyzes the productivity and efficeiency of different ship sizes to evaluate the effect of ship size on port operations.
불평등 전계에서 표준 뇌 임펄스 전압의 SF. /CF₄ 혼합 가스의 절연 내력
허창수(Chang-Su Huh),성허경(Heo-Gyung Sung),박신우(Shin-Woo Park),황청호(Cheong-Ho Hwang),김남렬(Nam-Ryul Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
In these days SF. mixtures and alternative gas have been studied because of global warming and liquefying at low temperature and high pressure. At present work the breakdown characteristics of SF. /CF₄ mixture in non-uniform field was performed. The experiments were carried out under positive and negative standard lightning impulse (SLI) voltages. The point-plane electrode was used with 3 ㎜ gap distance in the test chamber. The SF. /CF₄ mixture which contain 20% of SF. was compared with pure SF. and CF₄ gas. Experimental gas pressure ranged from 0.1 to 0.4 ㎫. The breakdown voltage under negative SLI is higher than the breakdown voltage under positive voltage. And the breakdown voltage of SF. 20%, CF₄ 80% mixture is similar to that of pure SF. .