• Title/Summary/Keyword: Portable equipment

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A Study on the 900MHz FDD Tranceiver for the Vessel (900MHz대 FDD 방식을 이용한 선내용 Tranceiver에 관한 연구)

  • 김정년;조학현;송면규;김기문
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 1998.05a
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    • pp.365-370
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    • 1998
  • The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather. Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation. and partly modified 900MHz band cordless phone circuit.

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A study on Protector Performance Evaluation According to X-ray Scattering Distribution of Portable Radiation System (이동형 방사선 발생장치 차폐물 설치에 관한 연구)

  • Kim, Hyong-Gyun;Sung, Dong-Keon;Cho, Kyong-Mi;Kim, Sang-Beom;Kim, Jae-Young;Choi, Jun-Ho
    • Korean Journal of Digital Imaging in Medicine
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    • v.11 no.2
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    • pp.85-92
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    • 2009
  • This study, "The study about performance evaluations of mobile cover for X-ray's diffusion and distribution in mobile radiation" is based on the rules of mobile defense apparatus for radiation producer in 2006. To use the mobile cover for X-ray for diagnosis has been compulsory in common wards except operation rooms, emergency rooms and intensive care units. we have confirmed the effect in arbitrary shielding material after Qualitiy Control was carried out for accuracy in an experiment of mobile photographing equipment. The performance evaluation was conducted with the fabrics of selenium, 0.2 mmPb, 0.1 mmPb and aluminiums. Considering the result, we choosed 0.1 mmPb and attached cover to mobile photographing equipment. We have finished making the cover after drew up the draft to attach cover to mobile photographing equipment through the modeling and the structural analysis. the process of the study is that we assembled the manufactured structures and carried out the practical experiment to take the photograph after attaching the fabric of 0.1 mmPb to mobile photographing equipment. It is need of additional thesises hereafter that we compare the result between the part to improve for safety besides convenience in photographic experiment about clinical radiation and the effect of covering the diffusion in condition attached the cover.

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A Development of Measuring Instrument of Portable Partial Discharge for Diagnosis of GIS Installation and Application (GIS 설비 진단을 위한 포터블 부분방전 측정장치 개발 및 응용)

  • Kim, Jong-Seo;Kim, Jin-Tea;Shin, Heung-Sik;Lee, Heung-Jea
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.2
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    • pp.231-234
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    • 2009
  • Recently, to the development of a highly information-oriented society to a large increase in dependence on power, Accordingly, it is need that active development and spread of preservation technology on accident prevention in operation electrical equipment. However, to lack of the use on maintenance technology of power equipment and to increase of power usage is growing deterioration of power equipment, this is a cause on casualties, property damage and the occurrence of disasters is a growing. GIS equipments which are operated from domestic except the equipment which manages from the big business are depend on a most visual inspection, and do inspection method or measuring instrument etc. a condition which is not supplied widely. Currently, many to measure instrument used in domestic is very expensive or foreign, it will be able to substitute this, the development necessity of the diagnosis technique and the measuring instrument is demanded.

Development of a Measuring Instrument of Current and Voltage on Power-Transmission Lines for the Construction of Energy-Network

  • Park, Kyi-Hwan;Jiang, Zhongwei
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.107.2-107
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    • 2001
  • We propose portable equipment that monitors a current and potential on high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to a hollow insulator that supports a power transmission line: A current on a power line is detected by an air-core solenoidal coil clamped to the line and the detected current signal is transmitted to the ground station by using optical data link, A potential on a power transmission line is detected by a high resistance element, zinc oxide (ZnO) that acts as a potential divider between the power line and the ground. The equipment does not require high potential insulators and magnetic cores which. This leads to the following advantages of the equipment: (a) It is easily installed owing to its small size and its simple structure; (b) It operates in low ...

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Portable Calibration System for Displacement Measuring Sensors

  • Eom, Tae-Bong;Lee, Jae-Yun;Kim, Jae-Wan;Joon, Lyou
    • International Journal of Precision Engineering and Manufacturing
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    • v.7 no.2
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    • pp.56-59
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    • 2006
  • A vibrational model of powder transfer equipment based on the lumped parameter method was developed, in which the operating motion consists of surging, bouncing, and pitching. After decoupling the equation of motion, the vibrational excitation source of the pitching motion was removed. So the designers are able to plan the optimum design to adjust the motion trajectory of the powder transfer equipment. That is, a procedure to adjust the motion trajectory of powder transfer equipment by changing design specifications such as the installation position, the direction of the motor, the driving speed, the mass unbalance, the stiffness coefficient, and the installation position of the support spring, is presented in this paper. The powder transfer equipment manufactured according to the results of this study did not suffer fatigue destruction, since the maximum stress on the basket structure was sufficiently small.

Cross Platform Game Development Environment for PMP (PMP(Portable Multimedia Player)를 위한 크로스 플랫폼 게임 개발 환경)

  • Lee, Ya-Ri;Kim, Jung-Sook
    • Journal of Digital Contents Society
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    • v.8 no.3
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    • pp.377-383
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    • 2007
  • The existing PMP contents have been usually providing moving picture services. However the rapid increasement by users of mobile equipment brought the need for multipurpose convergence, it is needed to develop the appropriate contents as these products appear. In this paper we designed the easy development environment for game contents that provide limited killer services. Game with the limited PMP input devices as a variety of portable input devices are developed and the equipment function of PMP itself is enhanced, its field of application will be further extended. So, we will design cross platform game development environment for PMP that is able to give friendly and valuable game contents to PMP users.

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Review of Membrane Tension Maintenance System for Membrane Structures through Membrane Tension Measurement (막장력 측정을 통한 막구조물의 장력 유지관리 시스템 검토)

  • Jin, Sang-Wook;Shon, Su-Deok;Lee, Seung-Jae
    • Journal of Korean Association for Spatial Structures
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    • v.16 no.2
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    • pp.39-45
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    • 2016
  • Membrane structure is a system that is stabilized by maintaining a tensile state of the membrane material that originally cannot resist the bending or pressure. Also, it is a system that allows the whole membrane structure to bear external loads caused by wind or precipitation such as snow, rain and etc. Tension relaxation phenomenon can transpire to the tension that is introduced to the fabric over time, due to the innate characteristics of the membrane material. Thus, it is important to accurately understand the size of the membrane tension after the completion of the structures, for maintenance and management purposes. The authors have proposed the principle of theoretically and indirectly measuring the tension by vibrating the membrane surface with sound waves exposures against the surface, which is compartmentalized by a rectangular boundary, and by measuring the natural frequency of the membrane surface that selectively resonates. The authors of this paper measured the tension of preexisting membrane structure for its maintenance by using the developed portable measurement equipment. Through analyzing the measurement data, the authors review the points that should be improved and the technical method for the new maintenance system of membrane tension.

A Study on the Implementation of a Portable Hologram Recording System for Optical Education

  • Cheolyoung, Go;Juyoung, Hong;Kwangpyo, Hong;Eunyeop, Shin;Leehwan, Hwang;Soonchul, Kwon;Seunghyun, Lee
    • International Journal of Advanced Culture Technology
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    • v.10 no.4
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    • pp.478-486
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    • 2022
  • Holography is a human-friendly technology that can express 3D stereoscopic information without eye fatigue. You can experience the mysterious features of light directly and indirectly, and you can also experience the principles of 3D imaging, which makes it a very good curriculum. As such, although holography is very effective in teaching students optics and 3D imaging technology, it has not yet been systematically established. The reason is the cost burden such as expensive equipment and laboratories, and the lack of easily accessible educational equipment. We implemented a portable holographic recording system to solve this problem. In addition, since silver halides, which use harmful chemicals, are not used in the process of developing the recording medium, and photopolymers are used, it is possible to educate not only the general public but also young students. In order to improve the completeness of the recorded result, the mechanism part, light source, and recording medium part of the production system were newly constructed to complement all the existing problems. The proposed system will make holography easily accessible to many people in a variety of fields, not just education. Through the interesting experience of various features and principles of light and the production of holograms with high satisfaction, we hope to popularize them in various fields such as education.

Application of portable digital radiography for dental investigations of ancient Egyptian mummies during archaeological excavations: Evaluation and discussion of the advantages and limitations of different approaches and projections

  • Seiler, Roger;Eppenberger, Patrick;Ruhli, Frank
    • Imaging Science in Dentistry
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    • v.48 no.3
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    • pp.167-176
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    • 2018
  • Purpose: In the age of X-ray computed tomography (CT) and digital volume tomography (DVT), with their outstanding post-processing capabilities, indications for planar radiography for the study of the dentition of ancient Egyptian mummies may easily be overlooked. In this article, the advantages and limitations of different approaches and projections are discussed for planar oral and maxillofacial radiography using portable digital X-ray equipment during archaeological excavations. Furthermore, recommendations are provided regarding projections and sample positioning in this context. Materials and Methods: A total of 55 specimens, including 19 skeletonized mandibles, 14 skeletonized skulls, 18 separate mummified heads, and 4 partially preserved mummies were imaged using portable digital X-ray equipment in the course of archaeological excavations led by the University of Basel in the Valley of the Kings between 2009 and 2012. Images were evaluated by 2 authors with regard to the visibility of diagnostically relevant dental structures using a 4-point grading system(Likert scale). Results: Overall, the visibility of diagnostically relevant dental structures was rated highest by both authors on X-ray images acquired using a dental detector. The tube-shift technique in the lateral projections of mandibular dentition achieved the second-best rating, and lateral projections achieved the third-best rating. Conclusion: Conventional planar digital X-ray imaging, due to its ubiquity, remains an excellent method-and often the only practicable one-for examining the skulls and teeth of ancient Egyptian mummies under field conditions. Radiographic images of excellent diagnostic quality can be obtained, if an appropriate methodology regarding the selected projections and sample placement is followed.