• Title/Summary/Keyword: Test Equipments

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Development of a Cost Effective Radio Communication System for UAS (무인항공기용 저비용 고효율 무선통신 시스템 개발)

  • Park, Sang-Hyuk;Kim, Sung-Su;Choi, Kee-Young;Park, Choon-Bae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.6
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    • pp.600-607
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    • 2008
  • Reliable wireless transmission of data generated by the flight critical subsystems or mission equipments of the unmanned aerial system is critical for mission success. As the UAS system becomes more sophisticated, its dependency on a reliable high rate radio communication system also increases. This requirement is applied not only during the operation phase but also in the early development test phase. This paper introduces a practical cost-effective communication system for a UAS. The downlink module combines analog NTSC video signal with onboard data, and send them using 2.4 GHz carrier wave. The uplink system has less a severe requirement on the bandwidth, and thus uses 430 MHz signal. This paper also presents a sample packet structure which can be adopted for many UAS of similar class.

Development of M2M-based Underground Space (subway) Disaster Response Network and EL Display Integrated Board (M2M기반 지하공간(지하철) 재난대응 네트워크 및 EL 디스플레이 통합 보드 개발)

  • Park, Miyun;Kwon, Segon;Park, EunChurn;Lee, Jeonhun
    • Journal of the Society of Disaster Information
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    • v.13 no.4
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    • pp.422-441
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    • 2017
  • Notifying emergency evacuation methods, accurate disaster location and evacuation route guidance can be very active alternatives to quickly minimize evacuation and casualties in disaster situation in the development of subway disaster prevention detection system that detects the disaster signs at the subway station early on the basis of Internet of things and leads passengers to evacuate. It's not easy to ensure perfect functioning of fire fighting facilities and equipments due to underground space structure with narrow exits. Therefore, we developed disaster provision EL Display integrated board that can induce the most efficient evacuation and the field experiment was conducted to examine the practical application in this study. Especially the applicability was verified by field application test because there is no case in which EL panels are used to evacuate disasters.

ISO14001-based u-LCA System Development for Operation of Environmental Facilities (환경기초시설 운영을 위한 ISO14001 기반 u-LCA 시스템 개발)

  • Han, Kwang-Rok;Lee, Ki-Cheol;Sohn, Surg-Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.8
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    • pp.2117-2125
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    • 2009
  • This paper describes an information system of operation adequacy in environmental facilities such as environmental contamination prevention and processing equipments, which is namely, an integrated management system for environmental facilities. By developing this system, we can improve environmental characteristics and maximize the efficiency throughout the life cycle from generation of contaminant source to contamination prevention processing, and to contaminant disappearance. In order to meet these objects, we have developed ubiquitous life cycle assessment(u-LCA) for environmental facilities, which is an ISO14001-based incineration facility information system. The developed system is currently operating for test at an incinerator in Koyang city. Due to this system, the managers can confirm the operation condition of the incinerator with real-time and they will be able to improve the problems immediately.

Structural Analysis Methods for RC Building Demolition Work under Heavy Equipment Loading (해체공사 실무자를 위한 기계식 해체대상 RC구조물의 해석기법 제안)

  • Park, Seong-Sik;Lee, Bum-Sik;Park, Ji-Young;Kim, Hyo-Jin;Sohn, Chang-Hak
    • Land and Housing Review
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    • v.2 no.4
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    • pp.569-575
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    • 2011
  • In domestic mechanical demolition work against RC building, unsuitable selection and loading of heavy equipment have led to occasional accidents such as collapse of structural members during the work. Therefore, proper analysis technique to easily decide allowable equipment load on the structure is needed at the planning stage of mechanical demolition work. In this paper, performing loading test and elastic analysis against 4-story building at full scale, we confirm appropriateness for allowable load of equipment on RC structures, which was suggested in previous study, and suggest structural analysis method that can evaluate safety of RC building during the mechanical demolition. The suggested method can be effectively utilized to improve work efficiency through safety of mechanical demolition work against RC building and proper management of equipments.

Development of Fuel Channel Inspection System in PHWR (중수로 연료관 검사시스템 개발)

  • Choi, Sung-Nam;Yang, Seung-Ok;Kim, Kwang-Il;Lee, Hee-Jong
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.1
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    • pp.60-67
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    • 2016
  • A pressurized heavy water reactor (PHWR) designed to refuel in service produces the energy required by nuclear fission. The fuel channel consists of components such as a pressure tube which directly contacts the fuel and is a passage for the reactor coolant, a calandria tube which contacts the moderator and is rolled joint with calandria, and a spacer which is not to contact the pressure tube and a calandria tube. As the fuel channel is one of the most important equipments, it requires accurate and periodic inspections to assess the integrity of a reactor in accordance with CSA N285.4. A fuel channel inspection system is developed to inspect fuel channels during in-service inspection in Wolsong unit. In this paper, the results and considerations of a field test are presented in order to show the effectiveness of the developed fuel channel inspection system.

Construction of Evaluation Criteria and Module for Industrial Software (산업용 소프트웨어의 평가기준 및 모듈의 구축)

  • Lee, Byung-Tae;Yang, Hae-Sool
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.3
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    • pp.742-756
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    • 2008
  • Recently, it's increasing to use the applied technology related to the quantitative and qualitative growth of industry area. One of them is software to be used in industry area, and software is the most important part in using the industrial equipments. Therefore, the quality of software in the industrial devices determines the performance of the devices. At this time, it's inspired an evaluation and measurement of software quality to have within industrial equipment, and it's forming the research and development in domestic and foreign. In this paper, we constructed evaluation metrics based on ISO/IEC 12119, the International Standard for the general requirements of software and ISO/IEC 9126-2, the International Standard for the evaluation of software qualify characteristics and sub-characteritics, and for this accomplishment, It has been designed and developed industrial software international standard compatible approval system which approve a quality based on quality test result of industrial software using the ISO/IEC 14598-6 that international standard for organization of evaluation module.

Adhesive Behaviors of the Aluminum Alloy-Based CrN and TiN Coating Films for Ocean Plant

  • Murakami, Ri-Ichi;Yahya, Syed Qamma Bin
    • International Journal of Ocean System Engineering
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    • v.2 no.2
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    • pp.106-115
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    • 2012
  • In the present study, TiN and CrN films were coated by arc ion plating equipment onto aluminum alloy substrate, A2024. The film thickness was about 4.65 ${\mu}m$. TiN and CrN films were analyzed by X-ray diffraction and energy dispersive X-ray equipments. The Young's modulus and the micro-Vickers hardness of aluminum substrate were modified by the ceramic film coatings. The difference in Young's modulus between substrate and coating film would affect on the wear resistance. The critical load, Lc, was 75.8 N for TiN and 85.5 N for CrN. It indicated from the observation of optical micrographs for TiN and CrN films that lots of cracks widely propagated toward the both sides of scratch track in the early stage of MODE I. TiN film began to delaminate completely at MODE II stage. The substrate was finally glittered at MODE III stage. For CrN film, a few crack can be observed at MODE I stage. The delamination of film was not still occurred at MODE II and then was happened at MODE III. This agrees with critical load measurement which the adhesive strength was greater for CrN film than for TiN film. Consequently, it was difficult for CrN to delaminate because the adhesive strength was excellent against Al substrate. The wear process, which the film adheres and the ball transfers, could be enhanced because of the increase in loading. The wear weight of ball was less for CrN than for TiN. This means that the wear damage of ball was greater for TiN than for CrN film. It is also obvious that it was difficult to delaminate because the CrN coating film has high toughness. The coefficient of friction was less for CrN coating film than for TiN film.

The Effect of Proficiency in Environmental Sample Measurement on Analysis Results (환경시료 측정에서 분석자의 숙련도가 분석결과에 미치는 영향)

  • Yoon, Seok-Pyo;Kang, Seong Min;Son, Yeonmi;Jeon, Gang Weon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.29 no.2
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    • pp.25-30
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    • 2021
  • This study investigated how the indicators of quality control are improved by proficiency in the measurement of phosphate concentration. In addition, analysis equipments were to be compared to see if there were any differences in measurements depending on the type of analysis device. In order to find out the effect of the proficiency of the analyst on the analysis results, three analysts measured phosphate concentration seven times in accordance with the Korean water pollution test standards, and met the quality control indices if repeated more than five times. The limit of quantification for phosphate was calculated at 0.02 mg/L. If the analysis devices are different, the absorbance and concentration of the samples near the limit of quantification are statistically significant difference.

Literature Review on Rheological Properties and Required Performances of 3D Printable Cementitious Materials (3D 프린팅 시멘트계 재료의 유변학적 물성과 요구 성능에 관한 문헌 조사)

  • Oh, Sangwoo;Hong, Geuntae;Choi, Seongcheol
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.1
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    • pp.41-49
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    • 2021
  • 3D printing techniques have been recently adopted in the construction industry. It mainly utilizes additive manufacturing which is the fabrication process depositing successive layers of materials without any formworks. Conventional cementitious materials may not be directly applicable to 3D printing because 3D printable cementitious materials is required to satisfy such characteristics as pumpability, extrudability, and buildability in a fresh state. This study aimed to investigate rheological properties and required performances of 3D printable cementitious materials, by reviewing existing studies. Test methods and equipments, evaluation results and characteristics of mixture additives were compared. Based on reviews of existing studies, this study indicates that the viscosity is mainly relevant to the pumpability of 3D printable materials whereas the yield stress and thixotropy are important in securing buildability of the materials.

Block Media Communication System for Implementation of a Communication Network in Welding Workplaces (용접 작업장 통신네트워크 구축을 위한 블록매체통신시스템)

  • Kim, Hyun Sik;Kang, Seog Geun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.4
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    • pp.556-561
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    • 2022
  • In this paper, we present a block media communication (BMC) system which employs powerline communication to the equipments used in the welding process for ship-assembly and uses metal block as a communication medium. Inductive couplers are installed on digital feeder and pin jig. Information signal is added to the current generated by the welding gun, and applied to the block. When the welding operation starts, information generated in the field is transmitted to the monitoring server in real-time. The field test on the BMC system confirms that the transmitted data are correctly received at the server. Since the proposed system can be built without any changes to the existing welding process, it is helpful to increase competitiveness of the shipbuilding industry through smart factory of shipyards. It is also possible to quickly respond to emergency situations that may occur to workers in an electromagnetic wave shielding environment or a closed space, the effect of preventing industrial accidents will be great.