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IlKim,Jae-SungKim,ByeongHeuiHan,Chang-SikHa 한국고분자학회 2003 Macromolecular Research Vol.11 No.6
In the solution polymerizations of methyl methacrylate with (α-diimine)nickel(II)/methylaluminoxane (MAO), we observed effects of the position of two methyl substituents in the ligand on both the activities of the catalysts and the polymer microstructure. α-Diimine nickel(II) catalysts gave syndiotactic-rich poly(methyl methacrylate) with high molecular weight and narrow molecular weight distribution.
Low Power 260k Color TFT LCD Driver IC
Bo-SungKim,Jae-SuKo,Won-HyoLee,Kyoung-WonPark,Soon-YangHong 한국전자통신연구원 2003 ETRI Journal Vol.25 No.5
In this study, we present a 260k color TFT LCD driver chip set that consumes only 5 mW in the module, which has exceptionally low power consumption. To reduce power consumption, we used many power-lowering schemes in the logic and analog design. A driver IC for LCDs has a built-in graphic SRAM. Besides write and read operations, the graphic SRAM has a scan operation that is similar to the read operation of one row-line, which is displayed on one line in an LCD panel. Currently, the embedded graphic memory is implemented by an 8-transistor leaf cell and a 6- transistor leaf cell. We propose an efficient scan method for a 6-transistor embedded graphic memory that is greatly improved over previous methods. The proposed method is implemented in a 0.22 μm process. We demonstrate the efficacy of the proposed method by measuring and comparing the current consumption of chips with and without our proposed scheme.
Secure Integrated Circuit with Physical Attack Detection based on Reconfigurable Top Metal Shield
Yeongjin Mun,Hyungseup Kim,Byeoncheol Lee,Kwonsang Han,Jae-SungKim,Ji-Hoon Kim,Byong-Deok Choi,Dong Kyue Kim,Hyoungho Ko 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.3
Invasive physical attacks on integrated circuits (ICs), such as de-packaging, focused ion beam (FIB) chip editing, and micro-probing attempts, constitute security threats for chips with potentially valuable information, such as smart cards. Using a state-of-the-art circuit-editing technique, an attacker can remove an IC’s top metal layer, leaving its secure information exposed to micro-probing attacks. Security ICs can be seriously threatened by such attacks and thus require on-chip countermeasures. Conventional active shields, however, have difficulty coping with physical attacks based on FIB chip editing (i.e., bypassing the top metal shield). This study presents a novel countermeasure against physical attacks based on the use of a reconfigurable metal shield for both top metal removal and micro-probing attack detection. This shield consists of two circuits: an FIB chip editing detection circuit consisting of a random number generator and a micro-probing attempt detection circuit consisting of two conditionally synchronized ring oscillators. Both circuits share a randomly reconfigured top metal shield, which represents a promising solution for security against state-of-the-art invasive attacks.
Clinical Experience in Conformal Stereotactic Radiotherapy of Irregularly Shaped Intracranial Tumors
Ki-Hwan Kim,Moon-JuneCho,Dong-WukKim,Jun-SangKim,Seon-HwanKim,Shi-HunSong,Ji-YoungJang,Jae-SungKim,Chang-JoonSong 대한암학회 2003 Cancer Research and Treatment Vol.35 No.1
Purpose: The dosimetric advantages of multiple noncoplanarstationary fields for stereotactic radiotherapyor radiosurgery (SRT/S) are well known. However, thistechnique is not widely used due to the logistical problemsassociated with producing and testing customizedcollimators. We report our experience of SRT/Susing multiple non-coplanar stationary fields (conformalSRT/ S).Materials and Methods: Between August 1997 andFebruary 2002, we performed frameless SRT/S in 63patients. We chose conformal SRT/S when the tumor wasof a very irregular shape or larger than 4 cm. We obtainedthree pieces of information: 1) the couch translationsrequired to bring the target point to the isocenter, 2) thedistance between the stereotaxic markers in the CTstudy, and the distance between the markers determinedfrom orthogonal beam films, taken in the anterior- posteriorand lateral directions, and 3) the rotational movementof thehead position between the CT study and actualtreatment position. W e evaluated two kinds of data:1) the precision of the isocenter setup, and 2) thereproducibility of the head position in the a) translationaland b) rotational components.Results: Twenty-six of the 63 patients receiving stereotactictreatment received conformal SRT/S. The precisionof the isocenter setup for the conformal SRT/S wasx=-0.03±0.26 mm, y=0.19±0.25 mm and z=-0.20 ±0.27mm. The reproducibilities of the head position with theconformal SRT/S were 0.5 mm and less than 1o, for thetranslational and rotational components, in any plane.Conclusion: We were able to apply conformal stereotacticirradiation, which has a dosimetric advantage, toirregularly shaped intracranial tumors, with precision andreproducibility of head position for the isocenter setupnearly equivalent to that of frame-based SRS or multiple-arc SRT/S. (Cancer Res Treat. 2003;35:69-74)