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Donghyun Ko,Young-Gun Pu,Sangwoo Kim,Joon-Sung Park,Byung-Hak Cho,Kang-Yoon Lee 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a integrated Digitally Controlled Crystal Oscillator (DCXO) for PHS application. The frequency tuning is done by two-step MIM capacitor tuning scheme. The coarse tuning covers the frequency range of ±24ppm of the nominal frequency with the resolution of 0.75ppm. On the other hand, the fine tuning covers the frequency range of ±15ppm of the nominal frequency with the resolution of 0.12ppm. This chip is fabricated with 0.25㎛ CMOS technology, and the die area is 0.43㎜ × 0.55㎜ including PADs.
고동현(DongHyun Ko),정인혁(InHyuk Jung),최석환(Seok-Hwan Choi),최윤호(Yoon-Ho Choi) 한국정보보호학회 2018 정보보호학회논문지 Vol.28 No.4
비트코인과 같은 암호 화폐에 대한 관심이 증대됨에 따라 블록체인 기술은 뛰어난 보안성을 갖춘 분산 원장 플랫폼으로 다양한 응용분야에서 많은 주목을 받고 있다. 그러나 암호 화폐 채굴(Cryptomining) 과정에 대한 취약성으로 인해 타인에게 CPU와 같은 컴퓨터 자원을 몰래 갈취하는 공격인 Cryptojacking이 등장하였다. 그 중에서도 브라우저 기반 Cryptojacking은 사용자의 PC에 설치하는 동작 없이 단순히 웹 사이트를 방문하는 것만으로 공격이 수행된다는 점에서 그 심각성이 증대되고 있다. 현재까지의 Cryptojacking 탐지 시스템은 대부분 시그니처 기반으로 동작하기 때문에, 기존 Cryptomining 코드의 변형이나 새롭게 등장하는 Cryptomining 코드는 탐지하지 못하는 문제점이 존재한다. 이를 극복하기 위하여, 본 논문에서는 알려지지 않은 Cryptojacking 공격에 대한 탐지를 위해 Headless 브라우저를 이용하여 탐지대상 사이트의 공격 여부를 확인하는 동적 Cryptojacking 사이트 탐지 방안을 제안한다. 제안하는 동적 분석 기반 Cryptojacking 탐지 시스템은 기존 시그니처 기반 Cryptojacking 탐지 시스템에서 탐지하지 못하는 새로운 Cryptojacking 사이트를 탐지 할 수 있으며, Cryptomining 코드를 우회하여 호출하거나 난독화하더라도 이를 탐지하는 것이 가능하다. With the growing interest in cryptocurrency such as bitcoin, the blockchain technology has attracted much attention in various applications as a distributed security platform with excellent security. However, Cryptojacking, an attack that hijack other computer resources such as CPUs, has occured due to vulnerability to the Cryptomining process. In particular, browser-based Cryptojacking is considered serious because attacks can occur only by visiting a Web site without installing it on a visitor"s PC. The current Cryptojacking detection system is mostly signature-based. Signature-based detection methods have problems in that they can not detect a new Cryptomining code or a modification of existing Cryptomining code. In this paper, we propose a Cryptojacking detection solution using a dynamic analysis-based that uses a headless browser to detect unknown Cryptojacking attacks. The proposed dynamic analysis-based Cryptojacking detection system can detect new Cryptojacking site that cannot be detected in existing signature-based Cryptojacking detection system and can detect it even if it is called or obfuscated by bypassing Cryptomining code.
Ko, Kyung Yong,Lee, Sangyoon,Park, Kyunam,Kim, Youngjun,Woo, Whang Je,Kim, Donghyun,Song, Jeong-Gyu,Park, Jusang,Kim, Jung Hwa,Lee, Zonghoon,Kim, Hyungjun American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.40
<P>Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) have attracted considerable attention as promising building blocks for a new generation of gas-sensing devices because of their excellent electrical properties, superior response, flexibility, and low-power consumption. Owing to their large surface-to-volume ratio, various 2D TMDCs, such as MoS<SUB>2</SUB>, MoSe<SUB>2</SUB>, WS<SUB>2</SUB>, and WSe<SUB>2</SUB>, have exhibited excellent gas-sensing characteristics. However, exploration toward the enhancement of TMDC gas-sensing performance has not yet been intensively addressed. Here, we synthesized large-area uniform WS<SUB>2<I>x</I></SUB>Se<SUB>2-2<I>x</I></SUB> alloys for room-temperature gas sensors. As-synthesized WS<SUB>2<I>x</I></SUB>Se<SUB>2-2<I>x</I></SUB> alloys exhibit an elaborative composition control owing to their thermodynamically stable sulfurization process. Further, utilizing uniform WS<SUB>2<I>x</I></SUB>Se<SUB>2-2<I>x</I></SUB> alloys over a large area, we demonstrated improved NO<SUB>2</SUB>-sensing performance compared to WSe<SUB>2</SUB> on the basis of an electronic sensitization mechanism. The WS<SUB>0.96</SUB>Se<SUB>1.04</SUB> alloy gas sensor exhibits 2.4 times enhanced response for NO<SUB>2</SUB> exposure. Further, we demonstrated a low-power wearable NO<SUB>2</SUB>-detecting wristband that operates at room temperature. Our results show that the proposed method is a promising strategy to improve 2D TMDC gas sensors and has a potential for applications in advanced gas-sensing devices.</P> [FIG OMISSION]</BR>