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VIBRATION DISPLACEMENT MEASUREMENT TECHNOLOGY FOR CYLINDRICAL STRUCTURES USING CAMERA IMAGES
손기성,전형섭,박진호,박종원 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.4
Acceleration sensors are usually used to measure the vibration of a structure. Althoughthis is the most accurate method, it cannot be used remotely because these are contacttypesensors. This makes measurement difficult in areas that cannot be easilyapproached by surveyors, such as structures located in high or dangerous areas. Therefore,a method that can measure the structural vibration without installing sensors is requiredfor the vibration measurement of structures located in these areas. Many conventionalstudies have been carried out on nonecontact-type vibration measurement methods usingcameras. However, they have been applied to structures with relatively large vibrationdisplacements such as buildings or bridges, and since most of them use targets, people stillhave to approach the structure to install the targets. Therefore, a new method is requiredto supplement the weaknesses of the conventional methods. In this paper, a method isproposed to measure vibration displacements remotely using a camera without having toapproach the structure. Furthermore, an estimation method for the measurement resolutionand measurement error is proposed for the vibration displacement of a cylindricalstructure measured using the proposed measurement method. The proposed methods aredescribed, along with experimental results that verify their accuracy.
A Unified Potentiostat for Electrochemical Glucose Sensors
손기성,오석재,김의진,김정민,김남수,김영석,김종원 한국전기전자재료학회 2013 Transactions on Electrical and Electronic Material Vol.14 No.5
A unified potentiostat circuit for both O2- and H2O2- based electrochemical glucose sensors was proposed and its function was verified by circuit simulations and measurement results of a fabricated chip. This circuit consisted of an operational amplifier, a comparator and current mirrors. The proposed circuit was fabricated with a 0.13 ㎛ thick oxide CMOS process and an active area of 360 ㎛ × 100 ㎛. The measurements revealed an input operation range from 0.5 V to 1.6 V in the H2O2- based bio-sensor and from 1.7 V to 2.6 V in the O2- based bio-sensor with a supply voltage of 3.3V. The evaluation results showed that the proposed potentiostat circuit is suitable for measuring the electrochemical cell currents of both O2- and H2O2- based glucose sensors.
구동 TFT 편차 보상을 위한 전압 피드백 AMOLED 디스플레이 구동 회로
손기성,조용수,손상희 한국반도체디스플레이기술학회 2023 반도체디스플레이기술학회지 Vol.22 No.4
This paper designed a voltage feedback driving circuit to compensate for the characteristic deviation of the Active Matrix Organic Light Emitting Diode driving Thin Film Transistor. This paper describes a stable and fast circuit by applying charge sharing and polar stabilization methods. A 12-inch Organic Light Emitting Diode with a Double Wide Ultra eXtended Graphics Array resolution creates a screen distortion problem for line parasitism, and charge sharing and polar stabilization structures were applied to solve the problem. By applying Charge Sharing, all data lines are shorted at the same time and quickly positioned as the average voltage to advance the compensated change time of the gate voltage in the next operation period. A buffer circuit and a current pass circuit were added to lower the Amplifier resistance connected to the line as a polar stabilization method. The advantage of suppressing the Ringing of the driving Thin Film Transistor can be obtained by increasing the stability. As a result, a circuit was designed to supply a stable current to the Organic Light Emitting Diode even if the characteristic deviation of the driving Thin Film Transistor occurs.