• Title/Summary/Keyword: Test path

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Evaluation of IC Electromagnetic Conducted Immunity Test Methods Based on the Frequency Dependency of Noise Injection Path (Noise Injection Path의 주파수 특성을 고려한 IC의 전자파 전도내성 시험 방법에 관한 연구)

  • Kwak, SangKeun;Kim, SoYoung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.4
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    • pp.436-447
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    • 2013
  • In this paper, Integrated circuit(IC) electromagnetic(EM) conducted immunity measurement and simulation using bulk current injection(BCI) and direct power injection(DPI) methods were conducted for 1.8 V I/O buffers. Using the equivalent circuit models developed for IC electromagnetic conducted immunity tests, we investigated the reliability of the frequency region where IC electromagnetic conducted immunity test is performed. The insertion loss for the noise injection path obtained from the simulation indicates that using only one conducted immunity test method cannot provide reliable conducted immunity test for broadband noise. Based on the forward power results, we analyzed the actual amount of EM noise injected to IC. We propose a more reliable immunity test methods for broad band noise.

A Reliable Study on the Accident Reconstruction using Accident Data Recorder (사고기록장치를 이용한 교통사고재현에 관한 신뢰성 연구)

  • Baek, Se-Ryong;Cho, Joeng-Kwon;Park, Jong-Jin;Lim, Jong-Han
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.5
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    • pp.179-187
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    • 2014
  • As an Accident data recorder (ADR) is a system to record a vehicle's status and dynamics information on the before and after of accident, Traffic accident investigation agencies and parts developers have a lot of interest to analyze an accident objectively and develop automotive safety devices by using real accident data, This study is to analyze an accident objectively and scientifically on the basis of traffic accident reconstruction with the use of output data of an event data recorder. This study is conducted double lane change test six times and slalom test one time as a field driving test and simulation. Based on the vehicle speed, the longitudinal and transverse acceleration, steering angle, driving path, and other kinds of information obtained from the field driving test, this study performed a simulation with PC-Crash program of reenacting and analyzing a traffic accident. The simulation was performed twice in the acceleration-steering angle input method and in the acceleration-driving path input method. By comparing the result of the field driving test with the results of the two simulations, we drew an analysis method with the optimal path reconstruction.

The effect of ankle joint mobilization technique on equilibrium ability in the individuals with supinated foot (회외발에 대한 족관절 관절가동술이 균형능력에 미치는 영향)

  • Gong, Won-Tae;Ma, Sang-Yeol;Kim, Tae-Ho
    • Journal of the Korean Data and Information Science Society
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    • v.20 no.3
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    • pp.527-539
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    • 2009
  • The purpose of this study was to evaluate the influence of ankle joint mobilization on equilibrium ability of supinated foot. Both Joint mobilization group(n=20) and control group(n=20) were measured an equilibrium ability by Balance performance monitor at pre-test, post-test in 2 weeks, post-test in 4 weeks and follow-up test in 2 weeks. The sway area, sway path length and sway maximum velocity of the joint mobilization group were significantly reduced among the experimental period (p<.05). The reduction of sway area, sway path length and sway maximum velocity were significantly different between the joint mobilization group and the control group at in 2 weeks, 4 weeks and follow-up test(p<.05). In conclusion, we were found that ankle joint mobilization could reduce sway area, sway path length and sway max velocity and improve a balance for the individuals with supinated foot.

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Plugging and Re-opening Phenomena of the 5Cr-1Mo Steel Leak Hole by Water Leakage in Sodium Atmosphere (소듐 분위기에서 물누출에 의한 5Cr-1Mo Ferrite강 구멍의 막힘과 재개방 현상)

  • Jeong, Kyung-Chai;Kim, Tae-Joon;Choi, Jong-Hyeun;Park, Jin-Ho;Hwang, Sung-Tai
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.674-679
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    • 1998
  • Small water leak experiment was carried out in liquid sodium atmosphere using a specimen of ferrite steel, which will be expected to be a material of the heat transfer tube of liquid metal fast breeder reactor. Self-plugging phenomena of leak path could be explained by the products of reaction and corrosion by sodium-water reaction. Also, re-opening mechanism of self-plugged path could be explained by the thermal transient and vibration of heat transfer tube. As a result, perfect re-opening time of self-plugged leak path was observed to be 129 minutes after water leak initiation. Re-opening shape of a specimen was appeared with double layer of circular type, and re-opening size of this specimen surface was about 2 mm diameter on sodium side.

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Multiple Path-planning of Unmanned Autonomous Forklift using Modified Genetic Algorithm and Fuzzy Inference system (수정된 유전자 알고리즘과 퍼지 추론 시스템을 이용한 무인 자율주행 이송장치의 다중경로계획)

  • Kim, Jung-Min;Heo, Jung-Min;Kim, Sung-Shin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.8
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    • pp.1483-1490
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    • 2009
  • This parer is presented multiple path-planning of unmanned autonomous forklift using modified genetic algorithm and fuzzy inference system. There are a task-level feedback method and a method that path is dynamically replaned in realtime while the autonomous vehicles are moving by means of an optimal algorithm for existing multiple path-planning. However, such methods cause malfunctions and inefficiency in the sense of time and energy, and path-planning should be dynamically replanned in realtime. To solve these problems, we propose multiple path-planning using modified genetic algorithm and fuzzy inference system and show the performance with autonomous vehicles. For experiment, we designed and built two autonomous mobile vehicles that equipped with the same driving control part used in actual autonomous forklift, and test the proposed multiple path-planning algorithm. Experimental result that actual autonomous mobile vehicle, we verified that fast optimized path-planning and efficient collision avoidance are possible.

Algorithm selecting Software development route suitable for Project environment and characteristics (프로젝트 환경과 특성에 따른 소프트웨어 개발 경로 선정 알고리즘)

  • Jung Byung-Kwon;Yoon Seok-Min
    • The KIPS Transactions:PartD
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    • v.13D no.1 s.104
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    • pp.87-96
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    • 2006
  • This paper focused on the method for customizing software development path, considering the project environments and characteristics. he selection standard of development path is composed of ten items, based on the process of ISO/IEC TR 15721 Information Technology Guide for ISO/IEC 12207 (Software Life Cycle Process) and ISO/IEC 15504 Information technology - Process assessment. The ten items were reflected the project environments and characteristics, at the same time the items conduct the adjustment item of selecting project development path. An algorithm for selecting software development path through items of the project environments and characteristics is presented. To test the algerian in this paper, a system for selecting development path, which reflected algorithm was developed. The development project for web-based system were also adopted to the system for selecting development path. In addition, provened hand-worked project path process differed from machine-worked project path process. The reason why it differs is that outputs were mixed or their names were changed. The effect is to select easily software development route suitable for project environment and characteristics.

Path planning for autonomous lawn mower tractor

  • Song, Mingzhang;Kabir, Md. Shaha Nur;Chung, Sun-Ok;Kim, Yong-Joo;Ha, Jong-Kyou;Lee, Kyeong-Hwan
    • Korean Journal of Agricultural Science
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    • v.42 no.1
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    • pp.63-71
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    • 2015
  • Path planning is an essential part for traveling and mowing of autonomous lawn mower tractors. Objectives of the paper were to analyze operation patterns by a skilled farmer, to extract and optimize waypoints, and to demonstrate generation of formatted planned path for autonomous lawn mower tractors. A 27-HP mower tractor was operated by a skilled farmer on grass fields. To measure tractor travel and operation characteristics, an RTK-GPS antenna with a 6-cm RMS error, an inertia motion sensing unit, a gyro compass, a wheel angle sensor, and a mower on/off sensor were mounted on the mower tractor, and all the data were collected at a 10-Hz rate. All the sensor data were transferred through a software program to show the status immediately on the notebook. Planned path was generated using the program parameter settings, mileage and time calculations, and the travel path was plotted using developed software. Based on the human operation patterns, path planning algorithm was suggested for autonomous mower tractor. Finally path generation was demonstrated in a formatted file and graphic display. After optimizing the path planning, a decrease in distance about 13% and saving of the working time about 30% was achieved. Field test data showed some overlap, especially in the turning areas. Results of the study would be useful to implement an autonomous mower tractor, but further research needs to improve the performance.

Multi-Stage Path Planning Based on Shape Reasoning and Geometric Search (형상 추론과 기하학적 검색 기반의 다단계 경로 계획)

  • Hwang, Yong-K.;Cho, Kyoung-R.
    • Journal of the Korean Institute of Intelligent Systems
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    • v.14 no.4
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    • pp.493-498
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    • 2004
  • A novel approach for path planning of a polygonal robot is presented. Traditional path planners perform extensive geometric searching to find the optimal path or to prove that there is no solution. The computation required to prove that there is no solution is equivalent to exhaustive search of the motion space, which is typically very expensive. Humans seems to use a set of several different path planning strategies to analyse the situation of the obstacles in the environment, and quickly recognize whether the path-planning problem is easy to solve, hard to solve or has no solution. This human path-planning strategies have motivated the development of the presented algorithm that combines qualitative shape reasoning and exhaustive geometric searching to speed up the path planning process. It has three planning stages consisting of identification of no-solution cases based on an enclosure test, a qualitative reasoning stage, and finally a complete search algorithm in case the previous two stages cannot determine of the existence of a solution path.

A Study on Speed Improvement of Gate Delay Test Generator for Combinational Circuits (조합회로에 대한 게이트 지연 검사 패턴 생성기의 속도 향상에 관한 연구)

  • 박승용;김규철
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.723-726
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    • 1998
  • Fault dropping is a very important part of test generation process. It is used to reduce test generation time. Test generation systems use fault simulation for the purpose of fault dropping by identifying detectable faults with generated test patterns. Two kinds of delay fault model is used in practice, path delay fault model and gate delay fault model. In this paper we propose an efficient method for gate delay test generation which shares second test vector.

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Development of Solution for Safety and Optimal Weather Routing of a Ship

  • Nguyen, Van Minh;Nguyen, Thi Thanh Diep;Mai, Thi Loan;Nguyen, Tien Thua;Vo, Anh Hoa;Seo, Ju-Won;Yoon, Gyeong-Hwan;Yoon, Hyeon-Kyu
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.05a
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    • pp.318-320
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    • 2018
  • When a ship sails on sea, it may be influenced by the environmental disturbance such as wind, wave, sea surface temperature, etc. These affect on the ship's speed, fuel consumption, safety and operating performance. It is necessary to find the optimal weather route of a ship to avoid adverse weather conditions which can put the crews in serious danger or cause structural damage to the vessel, machinery, and equipment. This study introduced how to apply A* algorithm based on sea trial test data for determining the optimal ship routes. The path cost function was modelled as a function of minimum arrival time or minimum energy depending on the time of various environment conditions. The specially modelled path-cost function and the safety constraints were applied to the A* algorithm in order to find the optimal path of the ship. The comparison of ship performances estimated by real sea trial's path and estimated optimal route during the voyage of the ship was investigated. The result of this study can be used to create a schedule to ensure safe operation of the ship with short passage time or minimum energy. In addition, the result of this study can be integrated into an on-board decision supporting expert system and displayed in Electronic Chart Display and Information System (ECDIS) to provide all the useful information to ship master.

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