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- 저자 : Incheol Seo(서인철) (검색결과 4 건)
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Dual Sensing with Voltage Shifting Scheme for High Sensitivity Touch Screen Detection
서인철,김형원,Seo, Incheol,Kim, HyungWon The Institute of Electronics and Information Engin 2015 전자공학회논문지 Vol.52 No.4
본 논문에서는 상호 정전용량 터치스크린의 single line sensing 방법에서의 단점을 해결하기 위한 성능향상 구조를 제안한다. 제안 구조는 Dual sensing 기법과 voltage shifting 기법을 도입하여 센싱 신호의 노이즈를 효과적으로 제거하고 터치 유무의 센싱 신호 차이를 증가시킨다. Dual sensing 기법은 구동신호의 양방향 엣지를 사용하여 integration 속도를 2배로 증가시켜 감지시간을 감소시킨다. Voltage shifting은 ADC의 입력신호 동작범위를 최대화하여 신호 대 노이즈비 (SNR)를 개선한다. 23" 대형 상용 터치스크린을 이용하여 simulation 및 측정한 결과로 제안된 센싱기법은 43dB의 SNR 성능을 가지며, 기존 방식 대비 2배의 스캔 속도를 제공하여 대형 터치스크린을 위한 적합한 기술임을 보인다. 제안된 센싱기법은 현재 매그나칩 CMOS 0.18um 공정으로 TSP 컨트롤러칩으로 구현되었다. This paper proposes a new touch screen sensing method that improves the drawback of conventional single-line sensing methods for mutual capacitance touch screen panels (TSPs). It introduces a dual sensing and voltage shifting method, which reduces the ambient noise effectively and enhances the touch signal strength. The dual sensing scheme reduces the detection time by doubling the integration speed using both edges of excitation pulse signals. The voltage shifting method enhances the signal-to-noise ratio (SNR) by increasing the voltage range of integrations, and maximizing the ADC's input dynamic range. Simulation and experimental results using a commercial 23" large touch screen show an SNR performance of 43dB and a scan rate 2 times faster than conventional schemes - key properties suited for a large touch screen panels. We implemented the proposed method into a TSP controller chip using Magnachip's CMOS 0.18um process.
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Dual Sensing with Voltage Shifting Scheme for High Sensitivity Touch Screen Detection
Incheol Seo(서인철),HyungWon Kim(김형원) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.4
본 논문에서는 상호 정전용량 터치스크린의 single line sensing 방법에서의 단점을 해결하기 위한 성능향상 구조를 제안한다. 제안 구조는 Dual sensing 기법과 voltage shifting 기법을 도입하여 센싱 신호의 노이즈를 효과적으로 제거하고 터치 유무의 센싱 신호 차이를 증가시킨다. Dual sensing 기법은 구동신호의 양방향 엣지를 사용하여 integration 속도를 2배로 증가시켜 감지시간을 감소시킨다. Voltage shifting은 ADC의 입력신호 동작범위를 최대화하여 신호 대 노이즈비 (SNR)를 개선한다. 23″ 대형 상용 터치스크린을 이용하여 simulation 및 측정한 결과로 제안된 센싱기법은 43dB의 SNR 성능을 가지며, 기존 방식 대비 2배의 스캔 속도를 제공하여 대형 터치스크린을 위한 적합한 기술임을 보인다. 제안된 센싱기법은 현재 매그나칩 CMOS 0.18um 공정으로 TSP 컨트롤러칩으로 구현되었다. This paper proposes a new touch screen sensing method that improves the drawback of conventional single-line sensing methods for mutual capacitance touch screen panels (TSPs). It introduces a dual sensing and voltage shifting method, which reduces the ambient noise effectively and enhances the touch signal strength. The dual sensing scheme reduces the detection time by doubling the integration speed using both edges of excitation pulse signals. The voltage shifting method enhances the signal-to-noise ratio (SNR) by increasing the voltage range of integrations, and maximizing the ADC’s input dynamic range. Simulation and experimental results using a commercial 23″ large touch screen show an SNR performance of 43dB and a scan rate 2 times faster than conventional schemes - key properties suited for a large touch screen panels. We implemented the proposed method into a TSP controller chip using Magnachip’s CMOS 0.18um process.
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진보된 세포분열억제 소핵 평가법을 활용한 체외 유전독성검사 및 3 차원 핵 이미지 분석
김혜지 ( Hye Ji Kim ),서인철 ( Incheol Seo ),심휘수 ( Whuisu Shim ),이채은 ( Chae-eun Lee ),장원석 ( Wonseok Chang ),이현수 ( Hyunsu Lee ),박순현 ( Sun-hyun Park ) 한국동물실험대체법학회 2018 동물실험대체법학회지 Vol.12 No.1
The cytokinesis-block micronucleus cytome assay is a measuring of DNA damage in once-divided binucleated (BN) cells scoring micronuclei (MNi) that are widely used as biomarkers of cancer risk in humans on drugs or chemicals. However, this assay is still challenging due to the speed of sample processing and the toxicity of organic chemicals on researcher. To address these problems, we developed a new and convenient method for the micronucleus cytome assay. This method by DAPI stained micronucleus detection is non-toxic to the researcher and is being simplified because it does not require the use of methanol and acetic acid for fixing cell. Especially, three dimensional imaging of nucleus by formalin fixed DAPI staining provides more detailed information for testing the effects of chemical and bio-materials, compared to the classic method. In this study, we examine the spatial distribution of the TANNylated GFPs by advanced cytokinesis-block micronucleus (ACBMN) assay. The TANNylated GFPs were precisely observed in the inner nucleus by three dimensional imaging, whereas GFPs were not detected in any regions of cells. This micronucleus assay can readily be used in genetic based toxicity and efficacy assay to the various bio-chemicals and pharmaceutical evaluation.
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양기욱 ( Kiwook Yang ),서인철 ( Incheol Seo ) 영남대학교 의과대학 2017 Yeungnam University Journal of Medicine Vol.34 No.2
Background: Varicella is the most common infectious disease reported despite the high vaccination rate. Interventions that target humans are particularly effective for varicella because humans are its only natural host. On the other hand, the existing national varicella surveillance systems lack the information to identify an outbreak. Therefore, a new index to assess varicella outbreaks was developed. Methods: The residential addresses of 2,718 varicella cases reported in Daegu in 2016 were converted to geographic coordinates and the distances between new varicella case and previous cases within 21 days were calculated from the date analyzed. Two cases were considered to be adjacent if the distance between them was less than 1 km. Finally, a proximity index was introduced by dividing the number of adjacent cases by the number of new cases on the date analyzed. Results: First, time-series charts and scatter plots were used to verify that the proximity index reflected the spatial closeness of the different varicella cases. The proximity index is helpful in identifying outbreaks from a list of single varicella cases. In addition, in this study, a new epidemic characteristic of varicella based on the proximity index was shown. Conclusion: The proximity index introduced in this study can be used to determine the likelihood of an outbreak from a single case of varicella, and it can be embedded in a web-based national varicella surveillance system that is currently in operation.
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