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Wonsik Yu,KwangSeok Kim,SeongHwan Cho IEEE 2014 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 1 R Vol.61 No.8
<P>This paper presents a second-order ΔΣ time-to-digital converter (TDC) by using a switched-ring oscillator (SRO) and a gated switched-ring oscillator (GSRO). Unlike conventional multi-stage noise-shaping (MASH) TDC using SROs, the proposed TDC does not require complex calibration to compensate for the error from frequency difference between the oscillators. Furthermore, the performance of the proposed TDC is analyzed, including non-idealities such as phase noise, mismatch, and PVT variations. The prototype 1-1 MASH TDC achieves 148 f s<SUB>rms</SUB> integrated noise in 4 MHz signal bandwidth at 400 MS/s while consuming 6.55 mW in a 65 nm CMOS process.</P>
Wonsik Kim,Seungsun Choi,Woojin Shin,Jaewon Oh,Mee-Yi Ryu,Hyunbok Lee 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.1
Ultraviolet-ozone (UVO) treatment modifies the surface properties of film for use in thin-film optoelectronics. In particular, the hydrophobic nature of the surface of organic films can be changed to a hydrophilic nature, thereby enabling a multilayer structure using a solution process. However, the electronic structure of organic films with UVO treatment has not been investigated in detail. In this study, the changes in the electronic structure of tetra-tert-butyl copper phthalocyanine (ttb-CuPc) films by UVO treatment were explored using UV-vis absorption spectroscopy and X-ray photoelectron spectroscopy (XPS). The ttb-CuPc film was fabricated by spin coating, and various UVO treatment times were applied. As the UVO treatment time increased, the absorption intensity of the ttb-CuPc films exponentially decayed. In the XPS spectra, the oxidation process was observed in two stages (macrocyclic isoindole units followed by peripheral ttb units). Upon oxidation, while the C and N atoms in the ligands exhibited an electron-donating characteristic, the central Cu atom showed an electron-withdrawing nature. Such an altered charge distribution on the ttb-CuPc molecule can significantly influence charge transport in optoelectronic devices.
초과로 부터 Amotsaokonal A-C, Benzaldehyde, Cycloterpenal의 성분분리
WonSik Jeong,Seong Su Hong,Changon Seo,Jin Gwan Kwon,Eun Kyung Ahn,Ju Hyeong Park,Hana Cho,Joa Sub Oh 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : Amomum tsao-ko (Zingiberaceae) is widely distributed among several countries in Asia. It’s dried fruit is widely used in Korea for medical plant, China and Japan for the treatment of dyspepsia, eliminates, vomiting, abdominal pain, phlegm, warms the spleen, and malaria. In this study, we describe the structural determination of the new compounds and the inhibitory activities of isolated compounds against LPS-induced NO production in RAW264.7 cells. Methods and Results : The fruits of A. tsao-ko were extracted with 80% EtOH two times at room temperature. The EtOH extract was suspended in distilled water and partitioned with solvent to give CH2Cl2, EtOAc and n-BuOH. The CH2Cl2 was suspended in n-hexane and partitioned with solvent to give 50%, 70% and 90% MeOH. The purification of each fraction by column chromatography separation and HPLC analysis. Consequently, one new benzaldehyde (1) and two new cycloterpenals (2 and 3) along with five known compounds (4 –8) have been isolated from the fruits of A. tsao-ko. The structure and relative stereochemistry were determined from HRMS, 1D and extensive 2D NMR techniques as well as by comparison of their data with the published values. Conclusion : These compounds were identified as Amotsaokonal A (1), Amotsaokonal B (2), Amotsaokonal C (3), methyl linolenate (4), trans-nerolidol (5), (2E)-dodecenyl acetate (6), (2E)-dodecenyl acetate (7), and pyrrole-2-carboxylic acid (8). All isolates were tested for their inhibitory activities on LPS-induced nitric oxide production in RAW264.7 cells.
Wonsik Choi(최원식),Pandu Sandi Pratama(프라타마 판두 산디),Destiani Supeno(수페노 데스티아니),Jaeyoung Byun(변재영),Ensuk Lee(이은숙),Jiung Yang(양지웅),Dimas Harris Sean Keefe(키프 디마스 하리스 신),Yeonho Jeon(전연호),Sungwon Chung(정성원) 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.5
In this research, tricycle vehicle simulation based on multi-body environment has been introduced. Mathematical model of tricycle vehicle was developed. In this research the left and right wheel speed are calculated based on the rear steering angle and velocity. The kinematic model for the three - wheel drive system was completed and the results were analyzed using the actual vehicle drawings. Through simulink vehicle performance on linear and rotation movement were simulated. Using the mathematical model the control system can be applied directly to the tricycle vehicle. The simulation result shows that the proposed vehicle model is successfully represent the movement characteristics of the real vehicle. This model assists the vehicle developer to create the controller and understand the vehicle during the development process.