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Choi, Su-An,Kim, Seung-Ryeol,Park, Myeong Seok,Chang, Sang Mok,Chang, Young Keun,Kim, Jong-Duk 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
The characteristic adsorption-desorption patterns of six quartz crystal microbalances(QCM) coated with different lipid LB films were examined for alcohols. For an olfactory sensing system, the response parameters of alcohols on the various lipids are obtained from the response curve. The initial slopes and the retardations of adsorption and desorption as characteristic parameters are applicable to recognize the chemical substances by the reversible process. The learning for the neural-network pattern recognition is demonstrated.
Structural basis for the recognition of N-end rule substrates by the UBR box of ubiquitin ligases
Choi, Woo Suk,Jeong, Byung-Cheon,Joo, Yoo Jin,Lee, Myeong-Ryeol,Kim, Joon,Eck, Michael J,Song, Hyun Kyu Nature Publishing Group, a division of Macmillan P 2010 Nature Structural and Molecular Biology Vol.17 No.10
The N-end rule pathway is a regulated proteolytic system that targets proteins containing destabilizing N-terminal residues (N-degrons) for ubiquitination and proteasomal degradation in eukaryotes. The N-degrons of type 1 substrates contain an N-terminal basic residue that is recognized by the UBR box domain of the E3 ubiquitin ligase UBR1. We describe structures of the UBR box of Saccharomyces cerevisiae UBR1 alone and in complex with N-degron peptides, including that of the cohesin subunit Scc1, which is cleaved and targeted for degradation at the metaphase-anaphase transition. The structures reveal a previously unknown protein fold that is stabilized by a novel binuclear zinc center. N-terminal arginine, lysine or histidine side chains of the N-degron are coordinated in a multispecific binding pocket. Unexpectedly, the structures together with our in vitro biochemical and in vivo pulse-chase analyses reveal a previously unknown modulation of binding specificity by the residue at position 2 of the N-degron.
Hwang, Min-Ju,Kim, Myeong-Gi,Kim, Sanghoon,Kim, Ye Chan,Seo, Hee Won,Cho, Jung Keun,Park, In-Kyung,Suhr, Jonghwan,Moon, Hyungpil,Koo, Ja Choon,Choi, Hyouk Ryeol,Kim, Kwang Jin,Tak, Yongsug,Nam, Jae-Do Elsevier 2019 Carbon Vol.142 No.-
<P><B>Abstract</B></P> <P>Anti-corrosion metal protection of the 2D structured graphene oxide (GO) was investigated in this study using its intrinsic impermeability against reactive molecules stemming from the small geometric pore size and π-orbital repelling fields of graphene. The electrophoretic deposition (EPD) of GO sheets on metals is an attractive coating method but the negatively-charged GO only allows the anodic EPD process, which makes it difficult to achieve high-quality coating layers due to gas bubbling and electrochemical oxidation of metals. Thus, we imposed the positive charge to GO sheets using <I>p</I>-phenylenediamine (PPD) and successfully carried out the cathodic EPD in the ethanol aqueous solution. The cathodic EPD of GO on cupper provided a linear growth rate with both deposition time and voltage providing the thickness over 6.0 μm in a void-free and robust feature, which could hardly be achieved by other coating methods. Converting the GO coating to the reduced GO (RGO) by thermal reduction, we successfully increased the RGO adhesion strength up to the highest adhesion grade of 5B in the cross-cut adhesion test. An excellent anti-corrosion protection capability of the developed RGO coating was demonstrated by a decreased corrosion current density and increased corrosion potential in potentiodynamic polarization analysis.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
실행 제어 명령어의 목적 주소 검증을 통한 소프트웨어 공격 탐지 기법
최명렬,박상서,박종욱,이균하,Choi Myeong-Ryeol,Park Sang-Seo,Park Jong-Wook,Lee Kyoon-Ha 한국정보처리학회 2006 정보처리학회논문지 C : 정보통신,정보보안 Vol.13 No.4
소프트웨어 공격이 성공하기 위해서는 공격 코드가 프로그램의 주소 공간에 주입된 후 프로그램의 제어 흐름이 공격 코드 위치로 변경되어야 한다. 프로그램의 주소 공간 중 코드 영역은 실행 중에 변경이 불가능하므로 공격 코드가 주입될 수 있는 곳은 데이터 영역 밖에 없다. 따라서 데이터 영역으로 프로그램의 제어가 변경될 경우 주입된 공격 코드로 제어가 옮겨 가는 공격이 발생한 것으로 판단할 수 있다. 따라서 본 논문에서는 프로그램의 제어 흐름과 관련된 CALL, JMP, RET 명령어의 목적 주소를 검사하여 제어가 옮겨갈 목적 주소가 프로그램의 실행 코드가 저장된 텍스트 영역이 아닌 데이터 영역일 경우 소프트웨어 공격이 발생한 것으로 간주하는 소프트웨어 공격 탐지 기법을 제안하였다. 제안된 방법을 이용하면 함수의 복귀주소뿐만 아니라 함수포인터, longjmp() 버퍼 등 프로그램 제어 흐름과 관련된 모든 데이터가 변경되었는지 점검할 수 있었기 때문에 기존 기법들보다 더 많은 종류의 공격을 탐지할 수 있었다. Successful software attacks require both injecting malicious code into a program's address space and altering the program's flow control to the injected code. Code section can not be changed at program's runtime, so malicious code must be injected into data section. Detoured flow control into data section is a signal of software attack. We propose a new software attack detection method which verify the target address of CALL, JMP, RET instructions, which alter program's flow control, and detect a software attack when the address is not in code section. Proposed method can detect all change of flow control related data, not only program's return address but also function pointer, buffer of longjmp() function and old base pointer, so it can detect the more attacks.
UV-curing kinetics and performance development of <i>in situ</i> curable 3D printing materials
Kim, Ye Chan,Hong, Sungyong,Sun, Hanna,Kim, Myeong Gi,Choi, Kisuk,Cho, Jungkeun,Choi, Hyouk Ryeol,Koo, Ja Choon,Moon, Hyungpil,Byun, Doyoung,Kim, Kwang J.,Suhr, Jonghwan,Kim, Soo Hyun,Nam, Jae-Do Elsevier 2017 European polymer journal Vol.93 No.-
<P><B>Abstract</B></P> <P>As three-dimensional (3D) printing technology is emerging as an alternative way of manufacturing, the high resolution 3D printing device often requires systems such as drop jetting printing of <I>in situ</I> UV-curable photopolymers. Accordingly, the key issue is process control and its optimization to ensure dimensional accuracy, surface roughness, building orientation, and mechanical properties of printed structures, which are based on the time- and temperature-dependent glass transition temperature (<I>T<SUB>g</SUB> </I>) of the resin system under UV-curing. In this study, the UV-cure kinetics and <I>T<SUB>g</SUB> </I> development of a commercially available UV-curable acrylic resin system were investigated as a model system, using a differential scanning photocalorimeter (DPC). The developed kinetic model included the limited conversion of cure that could be achieved as a maximum at a specific isothermal curing temperature. Using the developed model, the <I>T<SUB>g</SUB> </I> was successfully described by a modified DiBenedetto equation as a function of UV curing. The developed kinetic model and <I>T<SUB>g</SUB> </I> development can be used to determine the 3D printing operating conditions for the overlay printing and <I>in situ</I> UV curing, which could ensure high-resolution and high-speed manufacturing with various UV-curing materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> UV-cure kinetic analysis were applied to a commercial Multi-jet 3D printing material. </LI> <LI> The developed kinetic model included the limited conversion of cure by temperature. </LI> <LI> The <I>T<SUB>g</SUB> </I> was described by a modified DiBenedetto equation as a function of UV curing. </LI> <LI> The developed kinetic model showed an excellent agreement to isothermal experiments. </LI> <LI> The overlay printing time for each isothermal temperature was determined. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>