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A Novel Barometric Pressure Sensor Based on Piezoresistive Effect of Polycrystalline Silicon
Dongkyu Jang,Yoonki Hong,Seongbin Hong,Jong-Ho Lee 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.2
In this work, we propose a novel barometric pressure sensor based on the piezoresistive effect of polycrystalline silicon (Poly-Si). Key process steps for the fabrication of the barometric pressure sensor are explained. A sealed cavity is formed under the insulator diaphragm, and piezoresistors composed of 0.35 ㎛ thick Poly-Si is formed on the diaphragm. The distance between the diaphragm and the silicon substrate in the cavity is 2 ㎛. The Poly-Si is doped by implanting boron ions at a heavy dose and the effect of the dose is investigated. In this sensor, the stress and strain of diaphragm induced by an external atmospheric pressure are read by the piezoresistance change of the Poly-Si. The displacement of the diaphragm showed 0.17 ㎚ change at 1 h㎩. The changes in the strain applied to the Poly-Si on the diaphragm lead to a change in piezoresistance. The change in piezoresistance is amplified using a Whetstone bridge circuit fabricated on the same chip. The barometric pressure sensor has a sensitivity of 2.5 ㎶/h㎩ at a boron dose of 5×1015 ㎝<SUP>-2</SUP>
Barometric Pressure Sensor with Air Pocket Integrated with MOSFETs on the Same Substrate
Dongkyu Jang,Gyuweon Jung,Yujeong Jeong,Seongbin Hong,Jong-Ho Lee 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.3
In this paper, we propose a process to efficiently integrate barometric pressure sensors and MOSFETs on the same chip and show the measured results from these devices. The barometric sensor and MOSFETs are fabricated on the same Silicon substrate using CMOS process technology. The main process steps for the fabrication of the barometric sensor and MOSFETs are explained. Air pockets are connected around the barometric sensor and improve the sensitivity of the barometric sensor. The barometric sensor has a 0.5 μm thin diaphragm, which can reduce the size of the barometric sensor. The operating characteristics of the barometric sensor and the MOSFETs fabricated on the same substrate are verified.
5축 Machining Center를 이용한 스플리터가 있는 임펠러 가공에서 공구경로 생성에 관한 연구
장동규(Dongkyu Jang),신재광(Jaekwang Shin),이희관(Hikwan Lee),양균의(Gyuneui Yang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
The process of impeller 5-axis machining is presented. The tool path planning consists of roughing and finishing. The cutting tool path is generated on machining efficiency and impeller type. The cutting area can be divided into three regions in a splitter type. The tool of the maximum size is selected for each divided region. Interference can be avoided by checking the intersection of the cutting tool and ruling. In finishing the blades, hubs, and leading edges are machined. The blade can be finished with side cutting and the hub being machined in an iso-parametric path. The one-way point milling method is used for finishing the edge.<br/> <br/>
물리 모델 기반 1D 비정상상태 엔진 해석 기술 개발 및 적용 : G90 가솔린 3.5 터보 48V e-S/C
이동규(Dongkyu Lee),김지호(Jiho Kim),장원욱(Wonwook Jang),박종일(Jongil Park),남혜동(Hyedong Nam),최경욱(Kyungwook Choi) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Physical model based 1D engine transient simulation technic was developed in this study. Application to actual development work was regarded as the top priority after analyzing reasons why previous similar approaches had not been utilized in HMC. Transient phenomenon of boost build-up(Turbo-lag) during WOT acceleration for turbo-charged engine was modeled. The existing steady-state model was evolved to transient with minimized modifications. The response delay of actuators was considered as well as simplified ECU for WOT acceleration including scavenging logic. The developed model was validated against detailed measurement data. The technic was applied to RS4 G6DIII 3.5 T-GDi 48V e-S/C acceleration performance improvement. Several H/W layouts and S/W effects were evaluated before prototype design, then improvement direction was proposed.
박동규(Dongkyu Park),김준희(Junhee Kim),최형호(Hyungho Choi),장내웅(Naeung Jang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
The bumper system is important in determining the car styling. And it is also important for satistying the various requirements. These requirements are that 2.5mph & 5mph low speed impact, IIHS impact, European pedestrian protection impact, Airbag No/Must fire threshhold and vehicle compatibility.<br/> Firstly, we will study the main contents of these requirements and then show some method to meet the requirements. And we will also suggest the simplified equations to calculate the bumper beam section property and deflection. These equations will be used effectivily in the early design stage.<br/> And then, we will suggest the bumper system which satisfies the pedestrian protection impact. This suggestion will be useful for designing more friendly towards pedestrians.<br/> Afterwards, these summaries and suggestions will be used for providing the optimised bumper system satisfied the various requirements.<br/>
DeepPore: Fingerprint Pore Extraction Using Deep Convolutional Neural Networks
Han-Ul Jang,Dongkyu Kim,Seung-Min Mun,Sunghee Choi,Heung-Kyu Lee IEEE 2017 IEEE signal processing letters Vol.24 No.12
<P>As technological developments have enabled high-quality fingerprint scanning, sweat pores, one of the Level 3 features of fingerprints, have been successfully used in automatic fingerprint recognition systems (AFRS). Since the pore extraction process is a critical step for AFRS, high accuracy is required. However, it is difficult to extract the pore correctly because the pore shape depends on the person, region, and pore type. To solve the problem, we have presented a pore extraction method using deep convolutional neural networks and pore intensity refinement. The deep networks are used to detect pores in detail using a large area of a fingerprint image. We then refine the pore information by finding local maxima to identify pores with different intensities in the fingerprint image. The experimental results show that our pore extraction method performs better than the state-of-the-art methods.</P>