• Title/Summary/Keyword: Team efficiency

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A Study on the Design Procedure of the Eight Pole Magnetic Bearings for the Inner-rotor and the Outer-rotor Type

  • Lee, Jun-Ho;Park, Chan-Bae;Lee, Byung-Song;Lee, Su-Gil;Kim, Jae-Hee;Jung, Shin-Myung;Lee, Hyung-Woo
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1424-1430
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    • 2013
  • This paper presents design procedure of the magnetic bearings used for high-speed electric machines and flywheel energy storage systems. Magnetic bearing can be categorized by inner-rotor type and outer-rotor type according to the position of the rotary disc. These two types are applicable based on application environments such as application space, required attraction force, and controllability. Magnetic bearing is generally designed based on the ratio (geometrical coefficient or geometrical efficiency) of pole width to rotor journal radius but proper ratio is only decided by the analysis. This is the difficulty of the magnetic bearing design. In this paper, proper design technology of the inner-rotor type and outer-rotor-type eight pole magnetic bearings is introduced and compared with the FEM analysis results, which verifies the proposed design procedure is suitable to be applied to the design of the magnetic bearings for the industrial applications and flywheel energy storage system.

Optical Properties as Process Condition of Color Conversion Lens Using Low-softening Point Glass for White LED (백색 LED용 저 연화점 유리를 이용한 색 변환 렌즈의 제조 조건에 따른 광 특성)

  • Chae, Yoo-Jin;Lee, Mi-Jai;Hwang, Jong-Hee;Lim, Tae-Young;Kim, Jin-Ho;Jeong, Hee-Suk;Lee, Young-Sik;Kim, Deug-Joong
    • Journal of the Korean Ceramic Society
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    • v.50 no.6
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    • pp.454-459
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    • 2013
  • Recently, remote phosphors have been reported for application to white LEDs to provide enhanced phosphor efficiency compared with conventional phosphor-based white LEDs. In this study, a remote phosphor was produced by coating via screen printing on a glass substrate with different numbers of phosphor coating. The paste consists of phosphor, lowest softening glass frits, and organic binders. The remote phosphor could be well controlled by varying the phosphor content rated paste. After mounting the remote phosphor on top of a blue LED chip, CCT, CRI, and luminance efficiency were measured and values of 5300 K, 62, and 117 lm/W were respectively obtained in the 80 wt% phosphor with 3 coating layers sintered at $800^{\circ}C$.

Effect of Tax Investigators' Group Cohesiveness and Supervisor Trust on the Team Commitment and In-role Behavior (세무조사자들의 집단응집성과 상사에 대한 신뢰가 팀몰입과 역할내행동에 미치는 영향)

  • Hong, Soon-Bok;Jung, Woo-Sung
    • The Journal of the Korea Contents Association
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    • v.9 no.9
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    • pp.218-225
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    • 2009
  • The present research aims to analyze empirically the effect of group cohesiveness and supervisor trust which tax investigators recognize while performing tax administrative duties on the team commitment and in-role behavior. The result of the analysis showed that tax investigators' higher group cohesiveness and supervisor trust resulted in higher team commitment, and that higher team commitment in turn resulted in higher in-role behavior, thereby raising the efficiency of tax investigators' activities as well as tax payers' satisfaction with tax services. Therefore in order to improve the efficiency of tax organizations and team performance, the managers of the organizations must set solid goals, develop solid strategies appropriate for situation, and make proper compensations for investigators' achievements. In addition, there would have to be an organic improvement In all the relevant areas, including organization, personnel management, work style, compensation and welfare, in order to raise tax investigators' work desire.

Effect of Particle Size Distribution of Glass Frit on the Transparency of Transparent Dielectric Layer for Plasma Display Panel

  • Park, Ji-Su;Han, Sun-Mi;Hwang, Jong-Hee;Lim, Tae-Young;Kim, Kwang-Jin;Masaki, Takaki
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.555-557
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    • 2004
  • We report the effect of the particle size (D50) and PSD (Particle Size Distribution) of glass frit on the transparency of transparent dielectric layer of PDP. The milling efficiency of wet milling with water was the best among the dry milling, wet milling with IPA and wet milling with water. The transparency increased with the reduction of particle size of glass frit as the milling time increased. Also the transparency changed by the PSD of glass frit. Glass frits of broad PSD showed high transparency compared with the glass frits of sharp PSD.

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The Graphical User Interface Design for Optimal MRI Operation (MRI 시스템의 최적화 운용을 위한 GUI 디자인)

  • Moon, J.Y.;Kang, S.H.;Kim, K.S.;Kim, J.S.;Im, H.J.
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.05
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    • pp.235-238
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    • 1997
  • The Graphical User Interface (GUI) software is developed for 0.3 Tesla Permanent Magnet Resonance Imaging (MRI) system and the state of art of designing GUI system is discussed in this paper. The Object-Oriented concepts are applied for designing GUI software utilizing Interbase ODBC Database layer. Also, Multimedia concepts such as voice, sound and music are integrated in GUI system to enhance the efficiency of MRI operation.

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- Car Body Welding by $CO_2$ Remote Welding System- (($CO_2$ 레이저 원격용접 시스템을 이용한 차체용접)

  • Yeum, Jung-Whan;Lee, Heui-Bom;Jeong, Chang-Ho;Cho, Yong-Joon;Park, Hee-Kue
    • Proceedings of the Korean Society of Laser Processing Conference
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    • 2005.11a
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    • pp.7-10
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    • 2005
  • Nowadays, most automotives companies are making use of laser welding in car body assembly shop. But even though laser welding is better than resistance spot welding in many points, its application has been limited to special technology for manufacturing. The paper introduces in the field of remote welding system(RWS) to improve the process efficiency of laser welding. Positioning time of RWS between welding stitches are dramatically reduced to zero. It is a kind of solutions to generalize laser welding in mass production.

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Design and Simulation of White Color Mixing Lens for Backlight Unit

  • Hwang, Sung-Kyung;Lim, Mee-Hyun;Han, Hae-Wook;Cho, Min-Su;Lee, Jae-Ho;Jang, Kyeng-Kun;Kang, Sin-Ho;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.229-230
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    • 2009
  • This paper proposes a new design of ultra-slim color mixing lens (CML) for backlight unit (BLU), and presents simulated performance of the design. The novel color mixing structure has a shorter mixing length (< 1cm) than the existing color mixing structure, and achieves high efficiency and uniformity.

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Current Rating of High Voltage Connectors used for High Efficiency Vehicles (친환경/고효율 자동차용 고전압 커넥터의 정격전류 산정)

  • Youn, Bok-Hee;Nho, Yong-Joon;Cho, Sei-Hoon;Kim, You-Min;Kim, Dae-Gee;Park, Wan-Ki
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1488-1489
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    • 2007
  • This paper described the current rating methodology of high voltage connectors used for high efficient vehicles. Typically, temperature rise at rated current has been used to rate power contacts in automotive connector. However, for automotive applications, they are required to meet severe environmental conditions and high connector reliability. Therefore, it is very important to rate correctly an allowable current of automotive connector. We have measured the contact characteristics through current cycling at room temperature and at high temperature, as well as temperature rising and current carrying capacity by de-rating. From the above results, we have developed high reliable contacts with about 80 Amperes.

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Radiolytic Synthesis of Ag-Loaded Polystyrene(Ag-PS) Nanoparticles and Their Antimicrobial Efficiency Against Staphylococcus aureus and Klebsiella pneumoniase

  • Oh, Seong-Dae;Byun, Bok-Soo;Lee, Seung-Ho;Choi, Seong-Ho;Kim, Moon-Il;Park, Hyun-Gyu
    • Macromolecular Research
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    • v.15 no.4
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    • pp.285-290
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    • 2007
  • Ag nanoparticles were distributed onto polystyrene nanoparticle (PS-Ag) beads using two synthetic methodologies. In the first methodology, polystyrene (PS) beads were prepared via emulsion polymerization, with Ag nanoparticles subsequently loaded onto the surface of the PS beads. The polymerization of styrene was radiolytically induced in an ethanol (EtOH)/water medium, generating PS beads. Subsequently, Ag nanoparticles were loaded onto the PS beads via the reduction of Ag ions. The results from the morphological studies, using field emission transmission electron microscopy (FE-TEM), reveal the PS particles were spherical and nanosized, and the average size of the PS spherical particles decreased with increasing volume % of water in the polymerization medium. The size of the PS spherical particles increases with increasing radiation dose for the polymerization. Also, the amount of Ag nanoparticle loading could be increased by increasing the irradiation dose for the reduction of the Ag ions. In the second methodology, the polymerization of styrene and reduction of Ag ions were simultaneously performed by irradiating a solution containing styrene and Ag ions in an EtOH/water medium. Interestingly, the Ag nanoparticles were preferentially homogeneously distributed within the PS particles (not on the surface of the PS particles). Thus, Ag nanoparticles were distributed onto the surface of the PS particles using the first approach, but into the PS clusters of the particles via the second. The antimicrobial efficiency of a cloth coated with the Ag-PS composite nanoparticles was tested against bacteria, such as Staphylococcus aureus and Klebsiella pneumoniase, for 100 water washing cycles.