• Title/Summary/Keyword: Coil Cover

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A study on digital locking device design using detection distance 13.4mm of human body sensing type magnetic field coil (인체 감지형 자기장 코일의 감지거리 13.4mm를 이용한 디지털 잠금장치 설계에 관한 연구)

  • Lee, In-Sang;Song, Je-Ho;Bang, Jun-Ho;Lee, You-Yub
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.9-14
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    • 2016
  • This study evaluated a digital locking device design using detection distance of 13.4mm of a human body sensing type magnetic field coil. In contrast to digital locking devices that are used nowadays, the existing serial number entering buttons, lighting, number cover, corresponding pcb, exterior case, and data delivery cables have been deleted and are only composed of control ON/OFF power switches and emergency terminals. When the magnetic field coil substrates installed inside the inner case detects the electric resistance delivered from the opposite side of the 12mm interval exterior contacting the glass body part, the corresponding induced current flows. At this time, the magnetic field coil takes the role as a sensor when coil frequency of the circular coil is transformed. The magnetic coil as a sensor detects a change in the oscillation frequency output before and after the body is detected. This is then amplified to larger than 2,000%, transformed into digital signals, and delivered to exclusive software to compare and search for embedded data. The detection time followed by the touch area of the body standard to a $12.8{\emptyset}$ magnetic field coil was 30% contrast at 0.08sec and 80% contrast at 0.03sec, in which the detection distance was 13.4mm, showing the best level.

Sensor Calibration of a Helmet MEG System (헬멧형 뇌자도 장치의 센서 교정)

  • Kwon, H.;Kim, K.;Yu, K.K.;Kim, J.M.;Lee, Y.H.
    • Progress in Superconductivity
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    • v.12 no.1
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    • pp.57-61
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    • 2010
  • We have developed a whole-head MEG system for basic brain research and clinical application. The sensor system consists of a 152 SQUID gradiometer array oriented and located in a suitable way to cover a whole head of the human. The system measures magnetic fields generated by neuronal currents in the brain to get information on the brain activities. For this purpose, the field sensitivity determined by the position, orientation and geometry of the pickup coil as well as amplification factor of the electronic circuits should be known precisely. However, the position and orientation of the pickup coil might be changed from the designed specifications during cool down of the dewar and it is necessary to characterize the field sensitivity. In this study, we made calibration systems to determine the actual position and orientation of the 152 pickup coils and compared the localization results of the N100m source in the auditory cortex.

Reactive Ion Etching of InP Using $CH_4/H_2$ Inductively Coupled Plasma ($CH_4/H_2$유도결합 플라즈마를 이용한 InP의 건식 식각에 관한 연구)

  • 박철희;이병택;김호성
    • Journal of the Korean Vacuum Society
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    • v.7 no.2
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    • pp.161-168
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    • 1998
  • Reactive ion etching process for InGaAs/InP using the CH4/H2 high density inductively coupled plasma was investigated. The experimental design method proposed by Taguchi was utilized to cover the whole parameter range while maintaining reasonable number of actual experiments. Results showed that the ICP power mainly affects surface roughness and verticality of the sidewall, bias power does etch rate and verticality, CH4 gas concentraion does the verticality and etch rate, and the distance between the induction coil and specimen mostly affects the surface roughness. It was also observed that the chamber pressure is the dominant parameter for the etch rate and verticality of the sidewall. The optimum condition was ICP power 700W, bias power 150 W, 15% $CH_4$, 7.5 mTorr, and 14 cm distance, resulting in about 3 $\mu\textrm{m}$/hr etch rate with smooth surfaces and vertical mesa sidewalls.

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Preliminary Study of Hybrid Micro Gas Turbine Engine (하이브리드 타입 초소형 가스터빈엔진 개발 및 초도 시운전)

  • Seo, Junhyuk;Choi, Juchan;Kwon, Kilsung;Baek, Jehyun
    • The KSFM Journal of Fluid Machinery
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    • v.19 no.1
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    • pp.24-30
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    • 2016
  • In this study, a 2W micro-gas turbine engine was designed using micro-electro-mechanical systems (MEMS) technology, and experimental investigations of its potential under actual combustion conditions were performed. A micro-gas turbine (MGT) contains a turbo-charger, combustor, and generator. Compressor and turbine blades, and generator coil were manufactured using MEMS technology. The shaft was supported by a precision computer numerical control (CNC) machined static air bearing, and a permanent magnet was attached to the end of the shaft for generation. A heat transfer analysis found that the cooling effect of the air bearing and compressor was sufficient to cover the combustor's high temperature, which was verified in an actual experiment. The generator performance test showed that it can generate 2W at design rotational speed. Prototype micro-gas turbine generated maximum 1 mW electric power and lasted up to 15 minutes.

Backbone 1H, 15N, and 13C Resonance Assignment of HP1242 from Helicobacter pylori

  • Kang, Su-Jin;Park, Sung-Jean;Jung, Seo-Jeong;Lee, Bong-Jin
    • BMB Reports
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    • v.38 no.5
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    • pp.591-594
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    • 2005
  • One of the small proteins from Helicobacter pylori, HP1242, was investigated by the solution nuclear magnetic resonance (NMR) spectroscopy. HP1242 is known as a 76-residue conserved hypothetical protein and its function cannot be identified based on sequence homology. Here, the results of the backbone $^1H$, $^{15}N$, and $^{13}C$ resonance assignments of the HP1242 are reported using double- and triple-resonance techniques. About 95% of all of the $^1HN$, $^{15}N$, $^{13}CO$, $^{13}C{\alpha}$, and $^{13}C{\beta}$ resonances that cover 75 non- Proline residues of the 76 residues are clarified through sequential- and specific- assignments. In addition, three helical regions were clearly identified on the basis of the resonance assignments.

A Study On The Acoustic Noise Characteristics of Hard Disk Drive Due To The Structural Excitation Of Spindle Motor (하드디스크 드라이브에 있어서 스핀들모터의 구조적 가진에 따른 시스템의 소음 특성에 관한 연구)

  • Son, Young;Hwang, Tae-Yeon;Kang, Seong-Woo;Han, Yun-Sik;Koo, Ja-Choon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1549-1554
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    • 2000
  • HDD structure is excited by the dynamic motion of disk-spindle motor components. Those excitations which are generated at stator and magnet rotor, at bearings and from disk dynamics, are transmitted through motor spindle and flange to HDD cover and base. The operational deflection shape measurement can show the structural excitation patterns at the most influent frequency on the acoustic noise level. One of those components is the axial excitation along spindle, and the other is the local orbital excitation at contact area of motor flange and base. To make a reduction of those structural transmission excitations, the structure of spindle motor is modified to the direction of reinforcement at transmission path without change of bearings, magnet and coil. Some excitation of spindle motor component carrying out essential function is unavoidable. So it is the efficient way of HDD noise improvement to control the structural transmission of excitation.

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The Study of the Design Tests for Current Capability according to ANSI (ANSI 규격에 의한 주상 변압기의 동압력 내력시험에 관한 연구)

  • Kim, Sun-Koo;Kim, Won-Man;La, Dae-Ryeol;Roh, Chang-Il;Lee, Dong-Jun;Jung, Heung-Soo
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.909-911
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    • 2003
  • The almost pole transformers are constructed with tank, cover, clamp etc., that contains the insulation oil, core, coil, terminals, bus and the other accessories. If some fault current will be flown by some trouble or accident, interior pressure of the transformer shall be very quickly rise, and mechanical components or insulation oil from the transformer enclosure shall be propelled or dropped from the tank. For the prevention of the above accident, recently the pole transformers should be done 'the Design Tests for Fault Current Capability' according to ANSI C57.12.20(1997) There are two tests method in this standard, Test Number I with a high current arcing fault, without internal fusible elements, shall be conducted on rack enclosure with its minimum designed air space. Test Number II with an internal fusible element, shall be conducted on each enclosure diameter utilizing the internal fusible elements. KEPCO recently request to be done the 'Design Tests for Fault Current Capability' for pole transformers according to KEPCO's standard ES141-$533{\sim}545$, PS141-$482{\sim}518$ and RS141-$611{\sim}628$ that is same with Test Number I of ANSI C57.12.20.

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Effects of the Convector Plate Shape and the Atmospheric Gas on Characteristics of Heat Transfer in a Batch Annealing Furnace (BAF에서 분위기 가스와 대류판 형태가 열전달 특성에 미치는 영향)

  • Yoon, Soon Hyun;Kim, Moon Kyung;Kim, Dae Seong
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.8
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    • pp.72-79
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    • 1996
  • In a BAF(Batch Annealing Furnace), various studies have been pursued in order to reduce energy consumption rate to improve productivity and to stabilize the properties of products. The purpose of this study was to investigate the effects of both the atmospheric gas and convector plate shapes on the augmentation of heat transfer. The use of hydrogen instead of nitrogen as an atmospheric gas, combined with high convection in the BAF, has shown that considerable increases in furnace out put and significantly improved material quality are attainable. Because convector plate shapes make the atmosheric gas easily flow density, high diffusivity and reducing character of hydrogen, a better heat transfer rates resulting in uniform material temperature distribution and improved coil surface quality can be achieved. Also, it was found that the closed convector plate took more time for the annealing cycle time than the other plate type(open-type)by about ten hours.

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A computer Hardware Selection Strategy for Information Systems Development : A Case of T Coil Service Center (정보시스템 구축시 컴퓨터 하드웨어의 선정전략 - T 철강회사의 시스템 선정 사례 -)

  • Yu, Sang-Jin;Jang, Yeong-Taek
    • Asia pacific journal of information systems
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    • v.3 no.2
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    • pp.3-54
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    • 1993
  • Recently, executives learned of the strategic impact that information systems (IS) and information technology (IT) could provide to their organizations. In other words, through IS/IT companies could squelch competition, secure suppliers, obtain customer loyalty, reduce the threat of new entrants, and identify new opportunities. Because of these potential benefits, organizations are investing ever-increasing amount of organizational resources in IS/IT to make their organizations as information-based ones. Information-based organizations depend largely upon computer hardwares and softwares for their ongoing operations and management. Thus, organizations must manage their information resources, especially hardwares and softwares very effectively to remain competitive. Information resource management (IRI) is a program of activities directed at making effective use of information technology within an organization. These activities cover from corporate IS/IT planning to application system development, implementation, and maintenance. In more detail, IRV activities include planning for and acquiring computer hardwares and communication equipments, planning for, selection, and management of software development projects, and re-engineering business processes as IS/IT are integrated into organizational management. Among these activities, planning for and acquisition of computer hardwares, and planning for and management of software projects are the most critical ones since these activities require enormous amount of such important corporate resources as money, people, and time. Furthermore, corporate's eventual success largely depends upon whether corporate's policy on IS/IT is effective one or not. Numerous approaches and concepts to specific IRM activities have been proposed. However, many organizations have experienced various problems in the process of applying these approaches to their IRM activities mainly because existing methodologies and guidelines are too general to adapt to each firm's unigue situation. Also, these approaches are having its own strengths and weaknesses. Thus, people in charge of organization's IRM policy should come up with effective guidelines to maintain his position very long. In this study, we reviewed some existing approaches for planning, evaluation, and acquisition of computer hardware. Then, real experiences from Taechang Steel Co., Ltd. located in Taegu, which is one of the largest Coil Service Centers in Korea, are discussed. The major purposes of the study are : (1) to discuss the tradeoffs of existing approaches on hardware evaluation and acquisition, (2) to provide a real experience of a company to facilitate the application of theoretical concepts to the real environment.

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Numerical and Experimental Analysis of Micro Gas Turbine Heat Transfer Effect (초소형 가스터빈엔진 열전달 현상의 수치적 및 실험적 연구)

  • Seo, Junhyuk;Kwon, Kilsung;Choi, Ju Chan;Baek, Jehyun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.2
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    • pp.153-159
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    • 2015
  • In this study, a 2-W micro-gas turbine engine was designed using micro-electro-mechanical systems (MEMS) technology, and analytical and experimental investigations of its potential under actual combustion conditions were performed. An ultra-micro-gas turbine contains a turbo-charger, combustor, and generator. A compressor, turbine blade, and generator coil were manufactured using MEMS technology. The shaft was supported by a precision computer numerical control machined air bearing, and a permanent magnet was attached to the end of the shaft for generation. An analysis found that the cooling effect of the air bearing and compressor was sufficient to cover the combustor heat, which was verified in an actual experiment.