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Trajectory-Switching Algorithm for a MEMS Gyroscope
Park, Sungsu,Horowitz, Roberto,Hong, Sung Kyung,Nam, Yoonsu Institute of Electrical and Electronics Engineers 2007 IEEE transactions on instrumentation and measureme Vol.56 No.6
<P> The motion of a conventional force-balancingcontrolled gyroscope in a mode-matched operation does not have sufficient persistence of excitation, and as a result, all major fabrication imperfections cannot be identified and compensated for. This paper presents an adaptive force-balancing control for a microelectromechanical-system <TEX>$z$</TEX>-axis gyroscope using a trajectory-switching algorithm. The proposed adaptive forcebalancing control supplies additional richness of excitation to the internal dynamics of the gyroscope by switching the trajectory of the proof mass of the gyroscope, and it provides quadrature compensation, drive- and sense-axis frequency tuning, and closed-loop identification of the angular rate without the measurement of input/output phase difference. This algorithm also identifies and compensates the cross-damping terms which cause zero-rate output. </P>
Bionanoelectronic platform with a lipid bilayer/CVD-grown MoS<sub>2</sub> hybrid
Park, Yunjeong,Kang, Byunggil,Ahn, Cheol Hyoun,Cho, Hyung Koun,Kwon, Hyukjoon,Park, Sungsu,Kwon, Junhwan,Choi, Myunghwan,Lee, Changgu,Kim, Kyunghoon Elsevier 2019 Biosensors & bioelectronics Vol.142 No.-
<P><B>Abstract</B></P> <P>We demonstrate a bionanoelectronic platform for a supported lipid bilayer formed on an MoS<SUB>2</SUB> film for biosensing, biomolecule recognition, and bioelectronic applications. A large-area MoS<SUB>2</SUB> film was synthesized on a sapphire substrate and treated with O<SUB>2</SUB> plasma or Al<SUB>2</SUB>O<SUB>3</SUB> deposition to change the surface from hydrophobic to hydrophilic. Measurements of fluorescence and fluorescence recovery after photobleaching confirmed the physical properties of the lipid bilayer on the treated surfaces. We fabricated an electronic device using the treated MoS<SUB>2</SUB> film and characterized the influence of the lipid bilayer on its electrical properties. Furthermore, transmembrane ion channels peptide (gramicidin A) were incorporated into the lipid bilayer and modulations of the electrical properties of the device under various pH conditions and calcium ion were observed. This sensitive and stable platform has strong potential for housing artificial channels and transmembrane ion channels for advanced bioapplications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 2D bionanoelectronics based on lipid/MoS<SUB>2</SUB> hybrid was designed to monitor ion channel activity. </LI> <LI> Integration of lipid bilayer on a MoS<SUB>2</SUB> field effect transistor opens up potential utility of 2D nanomaterials for biosensing applications. </LI> <LI> Hybrid structure of MoS<SUB>2</SUB>/lipid bilayer with membrane peptides can provide a platform for designing interface between biology and electronics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park Arum,Lee Eun,Park Hyojung,Park Mee-Na,Lee Jiho,Song Kun Baek,Yoon Jisun,Jung Sungsu,Suh Nayoung,Yoon Jin,Yu Jinho 대한의학회 2021 Journal of Korean medical science Vol.36 No.40
Background: Atopic dermatitis (AD) is a chronic and relapsing inflammatory skin disease mediated by T helper type 2 (Th2) cells in acute phase. Group 2 innate lymphoid cells (ILCs) play a role in the initiation of the Th2 response. Although mold exposure is associated with the development of AD, studies on the underlying mechanisms are lacking. This study investigated whether group 2 ILCs are involved in inflammation in AD-like skin induced by Aspergillus fumigatus (Af). Methods: We investigated changes of group 2 ILCs population in Af-induced AD-like skin lesions. To induce AD-like skin lesions, Af extracts were applied to the dorsal skin of BALB/c and Rag1−/− mice five times per week, with repeat exposures at 2-week intervals. Results: The clinical parameters were higher in the Af-treated group than in the control group. Histologic findings revealed epiderrmal and dermal thickening as well as eosinophil and mast cell infiltration into the skin of Af-treated mice. Populations of group 2 ILCs in the skin were also significantly higher in the Af-treated group. In addition, interleukin-33 mRNA expression was significantly higher in the skin lesions of the Af-treated mice. In the Rag1−/− mice lacking mature lymphocytes, AD-like skin lesions were still induced by Af and ILCs depletion using an anti-CD90.2 mAb lowered the Af-induced inflammatory response. Conclusions: Group 2 ILCs may play a role in a murine model of Af-induced AD-like skin lesions.
Design of a Variable Stability Flight Control System
Sungsu Park,Joon Soo Ko 한국항공우주학회 2008 International Journal of Aeronautical and Space Sc Vol.9 No.1
A design objective for variable stability flight control system is to develop a controller of in-flight simulation capability that forces the aircraft being flown to follow the dynamics of other aircraft. This paper presents a model-following variable stability control system (VSS) for in-flight simulation which consists of feedforward and feedback control laws, the aircraft dynamic model to be simulated, and switching and fader logics to reduce the transient effect between two aircraft dynamics. The separate design techniques for feedforward and feedback control law proposals are based on model matching and augmented linear quadratic (LQ) techniques. The system allows pilots to select and engage VSS mode, and when deselected, the aircraft reverts to the baseline flight control system. Both the baseline flight control laws and VSS control laws are computed continuously during flight. Initialization of the state values are necessary to prevent instability, since VSS control laws have integrators and filters in longitudinal, and lateral/directional axes. This paper demonstrates and validates the effectiveness and quality of VSS with F-16 models embedded in T-50 in-flight simulation aircraft.
CGS 공법 적용 석회암 공동지역의 교량기초보강 사례 연구
박성수(Sungsu Park),홍종욱(Jongouk Hong),천병식(Byungsik Chun) 한국지반환경공학회 2013 한국지반환경공학회논문집 Vol.14 No.12
석회암은 일반적으로 망상형 공동이나 석회암 동굴 같은 대규모 공동을 형성시키고, 싱크홀과 돌리네 형태로 발전하기도 한다. 이러한 공동은 도로, 댐 등을 건설할 때 지반이 상부구조물을 지탱하지 못하여 부등침하 등으로 심각한 문제를 야기할 수 있어 공동충전 등의 보강이 필요하게 된다. 본 연구에서는 CGS 공법에 의한 석회암 공동지역의 구조물 기초 지반보강을 실시하고, 이를 통해 보강효과를 공학적으로 평가하였다. 먼저, 시추조사를 통해 지반의 구성 및 공학적 특성을 파악하였다. 또한, CGS 보강을 실시한 후, 보강검증을 위해 시추조사를 실시하였고, 시추조사 시 채취된 보강재코어 중 대표적인 시료에 대해 암석시험을 실시하여 보강재에 대한 물리적 특성을 파악하였다. 그 결과 CGS 공법을 적용한 후, 시추조사 시 채취된 보강재코어 중 대표적인 시료에 대해서 압축강도시험을 실시한 결과 공동 내 재료의 충전 상태가 양호한 것으로 나타났으며, 일축압축강도도 12.2~19.2(㎫)로 충분한 것으로 검토되어 석회암 공동이 적절하게 보강된 것으로 확인하였다. Limestone typically forms large caverns such as reticular caverns or limestone caves, and also forms sinkhole and doline. These caverns cause different settlement when constructing roads, dams, etc. because the foundation cannot sustain the upper structures. So it is necessary to reinforce foundation such as cavern filling method, etc. In this study, ground reinforcement for structure foundation was carried out using CGS method in limestone cavity area and evaluation of reinforcement effect from engineering viewpoint was conducted through the field test. Among others, boring test was carried out to identify the ground structure and engineering characteristics. After CGS reinforcement, boring test was conducted for supplementary verification, and with reinforcement core taken during boring test, rock test was carried out to identify the physical properties of reinforcement material. After applying CGS method, rock test of the typical specimen, among reinforcement cores, taken from boring test was carried out and physical properties of the reinforcement was identified. As a result of compressive test of core sample, material inside the cavity was filled properly, indicating compressive strength of 12.2~19.2(㎫) which was evaluated acceptable. Thus the limestone cavity proved to have been reinforced successfully.