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데이타 베이스 : 보안 분산 객체지향 데이타베이스 스키마의 통합
노봉남(Noh Bong Nam),박우근(Park Woo Geun) 한국정보처리학회 1995 정보처리학회논문지 Vol.2 No.5
분산 DBMS는 네트워크의 각 사이트에서 서로 다른 사용자에 의해 독립적으로 설계, 관리, 유지보수되고 있는 지역 스키마들을 통합하여 전역 가상 스키마를 제공하며, 특정 사이트의 사용자가 다른 사이트의 지역 데이타베이스를 투명하게 이용할 수 있는 환경을 지원한다. 또한 각 지역 스키마에 부여된 스키마 구성 엔티티들의 보안성질이 통합된 스키마에서도 유지되도록 해야한다. 그러나 분산 DBMS에서 지역 스키마의 보안성질을 유지할 수 있는 통합에 대한 연구는 거의 이루어지지 않았다. 본 논문은 분산 DBMS 환경에서 각 사이트의 지역 스키마 정의를 위한 모델로서 객체지향 모델을 확장한 다단계 보안 객체지향 데이타베이스 모델을 사용하였으며, 지역 스키마를 통합하는데 있어서 본래의 보안성질을 유지할 수 있는 통합 방법을 객체클래스, 객체클래스 사이의 관계를 중심으로 각각 8가지로 구분하여 제안하였다. A distributed DBMS integrates local schemas that are independently designed, maintained, and managed by different users at each site providing a global virtual schema. This global schema supports users at a specific site to transparently utilize local databases at different sites. The security features of the local schemas should also not be changed in the global schema integrating security features of each local schema. Researches on the integration of security features into local schemas in distributed DBMS environment, however, are very rare. This paper using the multilevel secure object-oriented database model(as the model for the definition of a local schema in distributed environment) which is an extension of the object-oriented models. It also suggests eight integration methods that can maintain the security features of local schemas. The eight methods are classified by the object classes and by the relationships among them.
노봉남(Bong-Nam Noh),김용성(Yong-Sung Kim),장옥배(Ok-Bae Chang) 한국정보과학회 1993 정보과학회논문지 Vol.20 No.9
객체지향 데이타베이스 시스템에서 상속 계층 구조는 매우 중요한 메카니즘이다. 객체지향 데이타 모델의 보안성을 고려한 연구가 최근에 활발하게 진행되어 왔다. 그러나 계층구조에서 상위 클래스에서 하위 클래스로 속성이나 메소드의 보안 상속 메카니즘에 대한 연구는 거의 이루어지지 않았다. 본 논문에서는 객체지향 데이타 모델에서의 보안성의 기본 개념들을 알아보고 계층 구조에서 계층 상속, 성질, 보안등급 순서 유지 성질, 제한 상속 성질, 포함 상속 성질, 중복 상속 성질, 다중 상속 성질, 혼합 상속 성질 등 7가지 보안 상속의 성질들에 대하여 제안하였다. Inheritance hierarchy is an important mechanism in Object-Oriented Database system. Recently security research has been focused on the study of object-oriented data model. However so far, almost none of such studies have discussed about the mechanism of the security inheritance of superclasses' atttibutes and methods in the inheritance hierarchy. This paper describes the basic concepts of security for object-oriented data model, and proposes seven security inheritance properties in hierarchy : hierarchy inheritance property, classification order preservation property, limit inheritance property, inclusion inheritance property, reloading inheritance property, multinle inheritance property, and combination inheritance property.
Protection effect of ZrO2 coating layer on LiCoO2 thin film fabricated by DC magnetron sputtering.
Noh, Jung-Pil,Jung, Ki-Taek,Jang, Min-Sun,Kwon, Tae-Hoon,Cho, Gyu-Bong,Kim, Ki-Won,Nam, Tae-Hyun American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.10
<P>Bare and ZrO2-coated LiCoO2 thin films were fabricated by direct current magnetron sputtering method on STS304 substrates. Deposited both films have a well-crystallized structure with (003) preferred orientation after annealing at 600 degrees C. The ZrO2-coated LiCoO2 thin film provide significantly improved cycling stability compared to bare LiCoO2 thin film at high cut-off potential (3.0-4.5 V). The improvement in electrochemical stability is attributed to the structural stability by ZrO2 coating layer.</P>
A colorimetric probe to determine Pb<sup>2+</sup> using functionalized silver nanoparticles
Noh, Kwon-Chul,Nam, Yun-Sik,Lee, Ho-Jin,Lee, Kang-Bong The Royal Society of Chemistry 2015 The Analyst Vol.140 No.24
<P>A simple and sensitive colorimetric method for the determination of Pb<SUP>2+</SUP> ions in aqueous samples was developed using 1-(2-mercaptoethyl)-1,3,5-triazinane-2,4,6-trione (MTT) functionalized silver nanoparticles (MTT-AgNPs). The Pb<SUP>2+</SUP> ion acted as the metal center of the coordination complex, which formed N–Pb<SUP>2+</SUP>–O coordination bonds with the MTT-AgNPs, shortening the interparticle distance, and inducing aggregation of the MTT-AgNPs. This aggregation resulted in a dramatic color change from yellow to dark blue. Using this methodology, the concentration of Pb<SUP>2+</SUP> ions in environmental samples could be quantitatively detected with the naked eye or by using UV-vis spectrometry. Also, we found that the selectivity and sensitivity of detection were noticeably improved in the pH range of 7–8, at which a more obvious color change was observed. The absorption ratios (<I>A</I><SUB>625</SUB>/<I>A</I><SUB>395</SUB>) of the modified AgNP solution exhibited a linear correlation with Pb<SUP>2+</SUP> ion concentrations within the linear range of 0.1–0.6 μg mL<SUP>−1</SUP>, and the limits of detection in tap and pond water were 0.02 and 0.06 μg mL<SUP>−1</SUP>, respectively. This cost-effective sensing system allows for the rapid and facile determination of Pb<SUP>2+</SUP> ions in aqueous samples.</P> <P>Graphic Abstract</P><P>A hypothetical coordination bond between Pb<SUP>2+</SUP> ions and MTT bound to a AgNP. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5an01601k'> </P>
Noh, Jung Pil,Jung, Ki Taek,Cho, Gyu Bong,Lee, Sang Hun,Kim, Ki Won,Nam, Tae Hyun American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>LiCoO2 thin films were fabricated by direct current magnetron sputtering method on STS304 and Ti substrates. The effects of substrate and annealing on their structural and electrochemical properties of LiCoO2 thin film cathode were studied. Crystal structures and surface morphologies of the deposited films were investigated by X-ray diffraction and field emission scanning electron microscopy. The as-deposited films on both substrates have amorphous structure. The (104) oriented perfect crystallization was obtained by annealing over 600 degrees C in STS304 substrate. The LiCoO2 thin film deposited on Ti substrate shows the (003) texture after annealing at 700 degrees C. The electrochemical properties were investigated by the cyclic voltammetry and charge-discharge measurement. The 600 degrees C-annealed LiCoO2 film deposited on STS304 substrate exhibits the inithial discharge capacity of 22 uAh/cm2 and the 96% capacity retention rate at 50th cycles. The electrochemical measurement on annealed films over 600 degrees C was impossible due to the formed TiO2 insulator layer using Ti substrate. As a result, it was found that the STS304 substrate seems to be more suitable material than the Ti substrate in fabricating LiCoO2 thin film cathode.</P>