• Journal of the Korean Society for Heat Treatment
• /
• v.34 no.1
• /
• pp.25-30
• /
• 2021

The differential gear system is a device designed to distribute the driving force of both vehicle wheels and control the rotational speed when the vehicle turns on a curve. The differential device consists of a differential gear case, a ring gear, and a pressure ring. A differential pinion gear and side gear are mounted on the differential pinion shaft inside the differential gear case. In this study, a pin press-fitting device that mounts the pinier gear and side gear to the differential pinion shaft in the differential gear case was designed, and a jig device for pin press-fitting using servo press was developed. In addition, by precisely measuring the pin press-in load and press-in distance according to the pin hole diameter of the differential gear shaft, the optimization of the pin pressin process was established.

• Journal of Software Assessment and Valuation
• /
• v.15 no.1
• /
• pp.109-114
• /
• 2019

In this paper, simulations of S-parameter and characteristic impedance for the probe pin are performed and its high-frequency performance is analyzed. The probe pins are arranged with one signal pin in the center and four ground pins on the top, bottom, left and right sides. The insertion loss and return loss of the probe pin are calculated while increasing the separation between the probe pins to 0.35 mm, 0.40 mm, and 0.50 mm, respectively. It is confirmed that the probe pin has different features of the insertion loss due to its periodic resonance phenomenon. Effect of the characteristic impedance on pitch and assignment of the probe pin is also analyzed. It is verified that there are a number of ground pins whose characteristic impedance is close to 50 Ω.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.27 no.9
• /
• pp.834-843
• /
• 2016

In this paper, the design of a PIN diode S-band transfer-type SP4T including its driver circuit is presented. Each path of the SP4T is composed of the cascade connection of series-shunt PIN diodes to improve the isolation performance. The SP4T is implemented using chip type PIN diodes and a 20 mil AIN substrate fabricated using thin film technology. The driver circuit for the SP4T is designed using a multiplexer and four NMOS-PMOS push-pull pair. From on-wafer measurement, the fabriacted SP4T shows a maximum insertion loss of 1.1 dB and a minimum isolation of 41 dB. The time performance of the driver circuit is evaluated using the packaged PIN diodes with the identical PIN diode chip, and the transition time for on-off and off-on are below 100 nsec. For an input power level of 150 W, the measured insertion loss and isolation are close to those of the on-wafer measurement taking into consideration of the coaxial package mismatch and insertion loss.

• Tribology and Lubricants
• /
• v.25 no.3
• /
• pp.157-162
• /
• 2009

In this paper, the hydrodynamic pressure and minimum oil film thickness of a pin bush bearing for a connecting rod have been analyzed as functions of the number of oil grooves and an arc length of oil grooves. The lubrication characteristic of a pin bush is governed by oil groove design factors, which are considered in this study. The most influential design parameter is a number of oil grooves, which is three oil grooves with an arc length of oil groove, 1/6($60^{\circ}$). This means that oil groove with a long arc length of a pin bush does not contribute to the hydrodynamic pressure development. Thus the optimal design of a pin bush is necessary with an increased number of oil grooves and a reduced arc length.

• Textile Coloration and Finishing
• /
• v.16 no.3
• /
• pp.39-46
• /
• 2004

This study surveys the physical properties of DTY composite yarns manufactured by pin, disk and belt texturing systems. For this purpose, 208d/36f POY PET and 40d/12f high shrinkable PET filaments are prepared for specimens. The composite yarns are manufactured with this texturized POY and high shrinkable PET filament using the pin, disk and belt type texturing machines. While the processing conditions of the pin and disk types texturing machines were fixed, those of a belt type texturing machine were varied with over feed to compare and analyze with the yarn physical properties of pin and disk type composite yarns.

• Transactions of Materials Processing
• /
• v.12 no.6
• /
• pp.582-587
• /
• 2003

This paper is concerned with the mechanical property changes of the milli-size products manufactured by forward extrusion processes with square dies. Experiments are carried out with pure aluminum and pure copper billets. Extrusion ratio and knock-out pad are chosen as the important process parameters affecting the changes of mechanical properties such as shear strength and hardness. Shear strength tests with the extruded milli-size pin have shown the strong relation between victors hardness and shear strength in the neck of a stepped pin. As the extrusion ratio increases, the hardness on both the surface and the center line of a pin also increase. It is also noted that the hardness on the surface is a little higher than that on the center. The existence of knock-out pad in extrusion die causes the hardness in the neck of a extruded pin to increase. Finally, the approximated linear relations between shear strength and hardness of a pin are suggested.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2008.11a
• /
• pp.1481-1484
• /
• 2008

대부분의 온라인 전자거래업체는 사용자의 신원을 확인하기 위해 주민등록번호를 요구하고 있다. 그러나 최근 발생하고 있는 대규모 개인정보 유출사고 등으로 주민등록번호가 노출되는 사례가 빈번하며, 주민등록정보를 타인이 도용하여도 효과적으로 확인 및 제어하는 수단이 없다는 문제가 있다. 이러한 문제를 해결하기 위해 주민번호대체수단이 제안되었으나, 최근 공공 i-PIN 과 민간 i-PIN 으로 구분되는 기술들의 연동 문제로 인해 적극적인 도입이 우려되는 상황이다. 따라서 본 논문은 최소한의 수정으로 이들 주민번호대체수단이 연동할 수 있는 방안을 제시한다. 기존의 민간 i-PIN 연동 프로토콜을 공공 i-PIN 에 적용하며 프로토콜 간의 연동 모듈을 두어 각 프로토콜을 처리한다. 제안된 기술은 공공 i-PIN 에 적용되어 현재 전국적으로 구축 중이다.

• Textile Coloration and Finishing
• /
• v.12 no.2
• /
• pp.79-88
• /
• 2000

Draw textured yarns have many differences with yarn quality as well as wearing, due to the bulkiness, thermal and physical properties according to the false twist texturing system. In order to improve such property, many studies have been accomplished for developing good textured yarns and their fabrics, but these have been essentially obtained by experimental data or mathematical analysis. This study surveyed various properties of DTY produced by false twist texturing system, namely pin and crossed-belt false twist insertion systems. And 6 yarn specimens of 2 group(pin twisting type, belt twisting type) were measured and analysed.

• Tribology and Lubricants
• /
• v.36 no.2
• /
• pp.64-67
• /
• 2020

In the conventional gerotor design, the circular arc tooth of the outer rotor is first introduced, and then the inner rotor profile is generated by simulating the outer rotor motion while the inner rotor is fixed. The profile generation of tooth meshing exhibits relativity; therefore, the outer rotor profile can be generated by the movement of the inner rotor. In this study, we propose the design of a gerotor with a pin-tooth inner rotor. First, the pin-tooth inner rotor is devised, and then the outer rotor profile is generated. The profile of the inner rotor is simply composed of equally arranged pins along a circle. The root of the inner rotor is designed as a conjugated arc of two pins. The trajectory of the pin center is obtained by the inner rotor operation, and then the outer rotor profile is determined as a parallel curve of the trajectory. In this gerotor design, the inner rotor has a simple configuration, and contact occurs between the pin parts of the inner rotor and the whole profile of the outer rotor. This affects the material selection and machining process. The pin tooth can be used to design the outer and inner rotors, enabling a double gerotor mechanism corresponding to a planetary gear system.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08a
• /
• pp.239-244
• /
• 2007

Highly efficient and stable white PIN OLED structures have been developed with a focus on possible AM display applications. Due to the use of the novel air-stable Novaled n-dopant material NDN26, the mass production compatibility of the PIN approach is improved. With both a conventional n-dopant, NDN1, and a novel air-stable n-dopant, NDN26, similar performance in efficiency and lifetime are reached. Based on highly a stable red fluorescent emitter system, the Novaled PIN approach allows for reaching ultra-long lifetimes of 1,000,000 hours at a brightness of $1,000\;cd/m^2$, both for top and for bottom emission layouts. Furthermore, inverted PIN structures for a possible use in a-Si backplane applications for AM displays are shown. With a phosphorescent green emitter system it could be demonstrated that for bottom and inverted as well as non-inverted top emission, a brightness of $1,000\;cd/m^2$ can be reached at below 3 V. In addition to low operating voltages and long lifetimes, PIN OLEDs also enable for device structures with extremely low operating voltage drifts, a feature of increasing importance for future AM display developments.