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Lee, Yongsu,Lee, Hyeonwoo,Jang, Jaeeun,Lee, Jihee,Kim, Minseo,Lee, Jaehyuk,Kim, Hyunki,Yoo, Seunghyup,Yoo, Hoi-Jun IEEE 2017 IEEE journal on emerging and selected topics in ci Vol.7 No.1
<P>A sticker-type system with hybrid integration of CMOS IC and organic optical sensors is proposed to monitor photoplethysmogram (PPG) signals. To solve problems with the previous solely organic sensor-based works, CMOS IC is implemented in 180 nm technology under 5 V/1.5 V dual power supply. The silver-wire printed planar-fashionable circuit board (P-FCB) is used to connect the CMOS IC with organic sensors. The proposed hybrid system has the five following key features: 1) Power-efficient structure of organic sensor; 2) Integrated analog front-end and digital processor; 3) Degradation compensation scheme; 4) Large parasitic elements optimized design; and 5) Motion artifact rejection scheme. The stickertype PPG monitoring system has mass of only 2g, including the batteries, and consumes only 233 mu W to operate. The PPG signal could be acquired from various body parts (finger, wrist, and neck). The peripheral oxygen saturation level (SpO(2)) extraction results are verified by comparison with a commercial sensor device.</P>
RNA helicase DEAD-box-5 is involved in R-loop dynamics of preimplantation embryos
Hyeonji Lee,Dong Wook Han,Seonho Yoo,Ohbeom Kwon,Hyeonwoo La,Chanhyeok Park,Heeji Lee,Kiye Kang,Sang Jun Uhm,Hyuk Song,Jeong Tae Do,Youngsok Choi,Kwonho Hong Asian Australasian Association of Animal Productio 2024 Animal Bioscience Vol.37 No.6
Objective: R-loops are DNA:RNA triplex hybrids, and their metabolism is tightly regulated by transcriptional regulation, DNA damage response, and chromatin structure dynamics. R-loop homeostasis is dynamically regulated and closely associated with gene transcription in mouse zygotes. However, the factors responsible for regulating these dynamic changes in the R-loops of fertilized mouse eggs have not yet been investigated. This study examined the functions of candidate factors that interact with R-loops during zygotic gene activation. Methods: In this study, we used publicly available next-generation sequencing datasets, including low-input ribosome profiling analysis and polymerase II chromatin immunoprecipitation-sequencing (ChIP-seq), to identify potential regulators of R-loop dynamics in zygotes. These datasets were downloaded, reanalyzed, and compared with mass spectrometry data to identify candidate factors involved in regulating R-loop dynamics. To validate the functions of these candidate factors, we treated mouse zygotes with chemical inhibitors using in vitro fertilization. Immunofluorescence with an anti-R-loop antibody was then performed to quantify changes in R-loop metabolism. Results: We identified DEAD-box-5 (DDX5) and histone deacetylase-2 (HDAC2) as candidates that potentially regulate R-loop metabolism in oocytes, zygotes and two-cell embryos based on change of their gene translation. Our analysis revealed that the DDX5 inhibition of activity led to decreased R-loop accumulation in pronuclei, indicating its involvement in regulating R-loop dynamics. However, the inhibition of histone deacetylase-2 activity did not significantly affect R-loop levels in pronuclei. Conclusion: These findings suggest that dynamic changes in R-loops during mouse zygote development are likely regulated by RNA helicases, particularly DDX5, in conjunction with transcriptional processes. Our study provides compelling evidence for the involvement of these factors in regulating R-loop dynamics during early embryonic development.
연비측정모드에서 디젤엔진 차량에 전자식 진공펌프 적용 시 연비 개선율 분석
김현우(Hyeonwoo Kim),이형채(Hyeongchae Lee),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The brake booster in a brake system of a diesel engine vehicle is a device has negative-pressure by a vacuum pump. It helps to reduce the brake operating force. In short, it is a brake force increasing device. Negative-pressure is generated by a vacuum pump that is a component consumes the power of engine. There are two kinds of vacuum pumps. One of the vacuum pumps is a mechanical vacuum pump and the other is a electronic vacuum pump. The mechanical vacuum pump operates with engine by belt. So a mechanical vacuum pump operates continuously when engine is operating, regardless of necessary condition. It means that a mechanical vacuum pump consumes continuously the engine power while driving. On the other hand, a electronic vacuum pump operates independently of engine operating. So it can control by supplying voltage. In other words, when negative-pressure is needed, a vacuum pump will operate. It can reduce the unnecessary engine power consumption. So this is of advantage to fuel economy. In this study, compared the application of a electronic vacuum pump and mechanical vacuum pump in a diesel engine vehicle on the FTP-75 mode and confirmed the effect of fuel economy. As a result , the improvement rate of fuel economy using a electronic vacuum pump was 00% compared with the result of using a mechanical vacuum pump.
Shin, Hyeonwoo,Kang, Chan-Mo,Chae, Hyunsik,Kim, Hyun-Gwan,Baek, Kyu-Ha,Choi, Hyoung Jin,Park, Man-Young,Do, Lee-Mi,Lee, Changhee American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.3
<P>Low temperature, solution-processed metal oxide thin film transistors (MEOTFTs) have been widely investigated for application in low-cost, transparent, and flexible electronics. To enlarge the application area, solution-processed gate insulators (GI) have been investigated in recent years. We investigated the effects of the organic/inorganic bi-layer GI to ZnO thin film transistors (TFTs). PVP, YOx nanoparticle composite, and polysilazane bi-layer showed low leakage current (similar to 10(-8) A/cm(2) in 2 MV), which are applicable in low temperature processed MEOTFTs. Polysilazane was used as an interlayer between ZnO and PVP, YOx nanoparticle composite as a good charge transport interface with ZnO. By applying the PVP, YOx nanoparticle composite/polysilazane bi-layer structure to ZnO TFTs, we successfully suppressed the off current (I-off) to similar to 10(-11) and fabricated good MEOTFTs in 180 degrees C.</P>
SeungYup Lee,HaeKook Lee,Hyunsuk Jeong,HyeonWoo Yim,SooYoung Bhang,SunJin Jo,KyungYoung Baek,Eunjin Kim,MinSeob Kim,JungSeok Choi,YongSil Kweon 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.3
Objective-To explore the structure of Internet gaming disorder (IGD) criteria and their distribution according to the different severity level of IGD. The associations of psychiatric comorbidities to each IGD symptom and to the IGD severity were also investigated. Methods-Consecutively recruited 330 Korean middle school students underwent face-to-face diagnostic interviews to assess their gaming problems by clinicians. The psychiatric comorbidities were also evaluated with a semi-structured instrument. The data was analyzed using principal components analysis and the distribution of criteria among different severity groups was visualized by plotting univariate curves. Results-Two principal components of ‘Compulsivity’ and ‘Tolerance’ were extracted. ‘Decrease in other activities’ and ‘Jeopardizing relationship/career’ may indicate a higher severity of IGD. While ‘Craving’ deserved more recognition in clinical utility, ‘Tolerance’ did not demonstrate much difference in distribution by the IGD severity. Internalizing and externalizing psychiatric disorders differed in distribution by the IGD severity. Conclusion-A hierarchic presentation of IGD criteria was revealed. ‘Decrease in other activities’ and ‘Jeopardizing relationship/career’ may represent a higher severity, thus indicating more clinical attention to such symptoms. However, ‘Tolerance’ was not found to be a valid diagnostic criterion.
이미지 전송을 위한 딥러닝 기반의 소스 채널 코딩 및 전력 최적화
표지영(Jiyoung Pyo),장석호(Seok-Ho Chang),이현우(HyeonWoo Lee),서준석(Jun-Seok Seo),권태훈(Tae-Hoon Kwon) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문은 링크 간 간섭이 존재할 때, 프로그레시브 패킷들의 조인트 소스 채널 코딩 및 전력 제어에 관한 연구이다. 각각의 패킷마다 서로 다른 데이터 전송률을 할당하는 경우의 연산 복잡도는 패킷의 개수가 증가함에 따라 지수적으로 증가한다. 송신전력을 최적화하는 문제 또한, 기존에 연구된 기법들은 수많은 반복을 통해 차선의 전력을 찾아내는 iterative 알고리즘이다. 따라서, 본 논문은 조인트 소스 채널 코딩과 전력 제어가 결합된 문제의 복잡도를 해결할 방안으로 deep neural network 구조를 제안하였다. 제안한 신경망은 기존의 알고리즘과 유사한 peak-signal-to-noise ratio(PSNR) 성능을 달성한다.