• 한국정보과학회논문지:시스템및이론
• /
• 제32권6호
• /
• pp.279-287
• /
• 2005

파일 무결성 검사는 시스템 자원의 안정성 여부를 판단할 수 있는 가장 확실한 방법이지만, 관리자의 경험과 능력에 따라 검사 시간과 효과에 많은 차이가 있을 수 있다. 따라서 가능한 빠른 대웅을 필요로 하는 침입 복구 및 대웅 시스템에 바로 사용하기에는 적합하지 않으며, 또한 손상 자원의 복구에 필요한 자원의 상태 정보는 수집 가능하지만 침입을 차단하기 위해 필요한 침입 행위 주체에 대한 정보는 수집할 수 없다. 본 논문에서는 위의 두 가지 문제를 해결하기 위해 시스템 호출 감시와 파일 무결성 검사를 연동하여 실시간으로 파일의 무결성을 검사하는 rtIntegrit을 제안한다. rtIntegrit은 Syswatcher라는 시스템 호출 검사 도구를 사용하여 요청된 행위를 항상 감시한다. 만약 지정된 파일에 이상 동작이 나타나면 이의 변화에 대하여 실시간으로 무결성 검사를 수행하도록 하고, 해당 관련된 프로세스의 정보를 수집하고 보고함으로서 침입 차단에 활용하게 한다. 또한 IDMEF 형식의 표준으로 감사 자료를 생성하여, 침입 대웅 및 복구 시스템들과 쉽게 연계할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제18권6호
• /
• pp.1449-1461
• /
• 2024

As technology advances, processor speeds are increasing at a rapid pace and digital systems require a significant amount of data bandwidth. As a result, careful consideration of signal integrity is required to ensure reliable and high-speed data processing. Crosstalk has become a vital area of research in signal integrity for electronic packages, mainly because of the high level of integration. Analytic formulas were analyzed in this study to identify the features that can predict crosstalk in multi-conductor transmission lines. Through the analysis, five variables were found and obtained a dataset consisting of 302,500, data points. The study evaluated the performance of various regression models for optimization via automatic machine learning by comparing the machine learning predictions with the analytic solution. Extra tree regression consistently outperformed other algorithms, with coefficients of determination exceeding 0.9 and root mean square logarithmic errors below 0.35. The study also notes that different algorithms produced varied predictions for the two metrics.

• 사물인터넷융복합논문지
• /
• 제9권3호
• /
• pp.7-12
• /
• 2023

디지털 포렌식에서 가장 중요하게 여기는 특징 중 하나는 무결성이다. 무결성은 데이터가 변조되지 않았음을 의미한다. 디지털 포렌식 과정에서 증거를 수집하는데 이 증거가 나중에 변조되었다면 증거로 사용될 수 없다. 아날로그 증거물은 사진을 찍어놓는 방식 등을 통해 변조된 사실을 쉽게 파악할 수 있다. 그러나 저장매체 속의 데이터 즉, 디지털 증거는 눈에 보이지 않기 때문에 변조되었는지 알기가 어렵다. 그래서 이 증거 데이터가 증거 수집 단계에서 법정 제출까지의 과정 중 변조가 되지 않았음을 증명하기 위해 해시값을 사용한다. 해시값은 증거 수집 단계에서 저장 데이터로부터 수집한다. 그러나 NAND 플래시 메모리는 내부적인 동작의 특성 때문에 시간이 지나면 물리적 데이터 형상이 수집 단계와 달라질 수 있다. 본 논문에서는 고의적인 데이터 훼손을 시도하지 않더라도 플래시 메모리의 물리적 형상이 변경될 수 있는 플래시 메모리의 특성 및 기술들을 연구한다.

• Journal of Positioning, Navigation, and Timing
• /
• 제9권3호
• /
• pp.285-292
• /
• 2020

This paper introduces a new computational efficient Dilution of Precision (DOP)-based landmark exclusion method while ensuring the safety of the LiDAR-based navigation system that uses an innovation-based Nearest-Neighbor (NN) Data Association (DA) process. The NN DA process finds a correct landmark association hypothesis among all potential landmark permutations using Kalman filter innovation vectors. This makes the computational load increases exponentially as the number of landmarks increases. In this paper, we thus exclude landmarks by introducing DOP that quantifies the geometric distribution of landmarks as a way to minimize the loss of integrity performance that can occur by reducing landmarks. The number of landmarks to be excluded is set as the maximum number that can satisfy the integrity risk requirement. For the verification of the method, we developed a simulator that can analyze integrity risk according to the landmark number and its geometric distribution. Based on the simulation, we analyzed the relationship between DOP and integrity risk of the DA process by excluding each landmark. The results showed a tendency to minimize the loss of integrity performance when excluding landmarks with poor DOP. The developed method opens the possibility of assuring the safety risk of the Lidar-based navigation system in real-time applications by reducing a substantial amount of computational load.

• 한국간호교육학회지
• /
• 제21권4호
• /
• pp.499-508
• /
• 2015

Purpose: This study was conducted in order to determine the extent of ego integrity and to confirm the association between the sense of ego integrity and integrated loneliness, social support, and social activities. Methods: For this study, 146 elderly people participated. The data was analyzed with SPSS/WIN 21.0, using descriptive statistics, t-test, ANOVA, correlation analysis, and hierarchical regression analysis. Results: In regards to differences between ego integrity according to general characteristics of subjects, there was a statistically significant difference in education (F=4.13, p=.007). In elderly living alone, ego integrity was significantly positive correlated with social support and social activities, but negative correlated with loneliness. These variables explained 43.2% of the sense of ego integrity. Conclusion: The study suggested that nursing programs and social activity programs designed to aid the elderly living alone must focus on reducing loneliness, as well as increasing social support and social activities, while taking education into consideration. Also, these programs should strive to build social support systems.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 추계학술대회논문집A
• /
• pp.843-848
• /
• 2000

The pressure tube is a major component of the CANDU reactor, which supports nuclear fuel bundle and it's containment vessel. If a flaw is found during the periodic inspection from the pressure tubes, the integrity evaluation must be carried out, and the safety requirements must be satisfied for continued service. In order to complete the integrity evaluation, complicated and iterative calculation procedures are required. Besides, a lot of data and knowledge for the evaluation are required for the entire integrity evaluation process. For this reason, an integrity evaluation system, which provides efficient way of evaluation with the help of attached databases, was developed. The developed system was built on the basis of ASME Sec. XI and FFSG(Fitness For Service Guidelines for zirconium alloy pressure tubes in operating CANDU reactors) issued by the AECL, and covers the delayed hydride cracking(DHC). Various analysis methods are provided for the integrity evaluation of pressure tube. In order to verify the developed system, several case studies have been performed and the results were compared with those from AECL. A good agreement was observed between those two results.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2003년도 추계학술대회
• /
• pp.1211-1215
• /
• 2003

Pressure tubes are major component of nuclear reactor, but only selected samples are periodically examined due to numerous numbers of tubes. Current in-service inspection result show there is high probability of flaw existence at un-inspected pressure tube. Probabilistic analysis is applied in this study for the integrity assessment of un-inspected pressure tube. But all the current integrity evaluations procedures are based on conventional deterministic approaches. So many integrity evaluation parameters are not directly apply to probabilistic analysis. As a result of this study failure assessment diagram are proposed based on test data.

• 한국생활과학회지
• /
• 제20권5호
• /
• pp.917-926
• /
• 2011

The purpose of this study is to identify the influence of ego integrity on death anxiety of the elderly, mediated by depression based on Erikson theory(1963). For this study, 313 elderly over 60 years old in Daegu city participated in a survey. The data of the survey was analyzed using SPSS 15.0 and Structural Equation Modeling(SEM) with AMOS 7.0. The results of the study are as follows: ego integrity of the elderly does not influence death anxiety due to the suppressing effect of depression. However, depression does mediate the relation between ego integrity and death anxiety fully. Such findings suggest that the Erikson theory can also be applied to elderly Korean citizens. A practical benefit derived from the study's results is the proposition to implement a reminiscence program, reinforce depression treatment and prevention systems, and augment a death awareness movement for elderly.

• Safety and Health at Work
• /
• 제13권2호
• /
• pp.192-200
• /
• 2022

Background: This study examines whether employee perceptions of supervisor behavioral integrity for safety moderates the relationship between top-management safety climate and safety performance (i.e., safety compliance and safety participation) and the mediated relationships through safety motivation. Methods: Data collected from 389 blue-collar employees were analyzed using latent moderated structural equation modeling. Results: The results indicate that the relationship between top-management safety climate and safety behavior, and the mediating role of safety motivation were replicated. Moreover, the results show that the mediated relationships between top-management safety climate and safety behaviors through safety motivation were stronger for employees who report high supervisor behavioral integrity for safety. Conclusion: The study findings suggest the role of supervisor behavioral integrity for safety in clarifying how the employee perceptions of top-management safety climate transfer to the employee safety behaviors through the motivational pathway.

• 정보과학회 논문지
• /
• 제43권4호
• /
• pp.497-508
• /
• 2016

클라우드 스토리지를 이용하면 사용자는 시간과 장소의 제약 없이 데이터를 원격으로 위탁 및 공유할 수 있게 된다. 그러나 기존에 클라우드에 존재하는 보안상 위협과 사용자가 물리적으로 본인의 데이터를 소유하고 있지 않는다는 사실로 인해, 클라우드 스토리지 서버에 저장된 사용자 데이터에 대한 무결성 검증이 필수적으로 요구되고 있다. 최근 몇 년간 클라우드 스토리지 환경에서 공공 무결성 검증 기법을 제안하는 많은 연구들이 제안되어 왔다. 그러나 현재까지 제안된 대부분의 클라우드 공공 무결성 검증 기법의 경우 검증 단계에서 과도한 연산량이 발생하거나 안전성을 보장받지 못했다. 본 논문에서는 J. Zhang등이 제안한 자체 인증 기반 무결성 검증 기법이 두 가지 공격에 취약함을 보인 후, 이 두 가지 공격에 안전하면서도 동일한 연산 효율성을 보장하는 새로운 자체인증 기반 클라우드 무결성 검증 기법을 제안한다. 뿐만 아니라, 제안하는 기법이 세 가지 안전성 모델에서 안전함을 증명한다.