• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권3호
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• pp.558-575
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• 2013

The purpose of a data leakage prevention system is to protect corporate information assets. The system monitors the packet exchanges between internal systems and the Internet, filters packets according to the data security policy defined by each company, or discretionarily deletes important data included in packets in order to prevent leakage of corporate information. However, the problem arises that the system may monitor employees' personal information, thus allowing their privacy to be violated. Therefore, it is necessary to find not only a solution for detecting leakage of significant information, but also a way to minimize the leakage of internal users' personal information. In this paper, we propose two models for representing the level of personal information disclosure during data leakage detection. One model measures only the disclosure frequencies of keywords that are defined as personal data. These frequencies are used to indicate the privacy violation level. The other model represents the context of privacy violation using a private data matrix. Each row of the matrix represents the disclosure counts for personal data keywords in a given time period, and each column represents the disclosure count of a certain keyword during the entire observation interval. Using the suggested matrix model, we can represent an abstracted context of the privacy violation situation. Experiments on the privacy violation situation to demonstrate the usability of the suggested models are also presented.

• 한국정보처리학회논문지
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• 제5권6호
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• pp.1575-1582
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• 1998

본 논문에서는 멀티에이전트 환경상에서 에이전트 그룹들이 문제 풀이 과정이 변화할 때 적절한 협력대상을 선택하여 문제 해결 능력을 증가 시킬 수 있도록 협력 모델을 설계하고 평가 하였다. 그룹간 협력의 방향과 범위를 결정하기 위해 그룹 이익함수를 사용하였고 그룹을 협력 관련 부분과 비 관련 부분으로 분리 운영하였다. 이렇게 상황에 따라 재구성되는 그룹들을 그룹 수준에서 운영하기 위해 기존의 자료와 목표(goal)가 아닌 그룹의도(group intention)를 제어 기준으로 사용하였다. 이로 인해 그룹들은 먼저 그룹의도를 결정하고 그룹의도의 범위 안에서 현 상황에 적절한 전략을 선택하는 계층적인 제어가 가능하게 되었다. 이상의 제안들은 추적게임 테스트베드에 적용하여 실험/평가 되었다.

• 정보관리학회지
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• 제28권3호
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• pp.123-139
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• 2011

유비쿼터스 컴퓨팅의 주요 기술인 상황인지는 환경을 구성하는 다양한 종류의 정보 기기로부터 전달되는 상황 정보를 이해하고 처리하며, 다양한 도메인에 유연하게 적용할 수 있는 상황인지 모델을 필요로 한다. 시맨틱 웹 기술 기반의 온톨로지는 구조화된 공통의 포맷을 이용하고 의미적인 정보의 표현이 가능하므로, 시스템이 상황 정보를 공유하고 이해, 추론함으로써 효과적인 상황인지가 가능하다. 따라서 온톨로지를 이용한 상황인지 모델이 여러 연구에서 제시되어 왔는데, 본 논문에서는 이러한 기존 연구들에 대한 분석을 바탕으로 상황인지 모델의 범용성과 확장성을 위해 온톨로지의 구조를 계층화하고 이를 기반으로 상황인지 시스템을 구현하여 실제 u-Convention 도메인에 적용하였다. 또한 OWL-DL의 기술논리와 SWRL 규칙 추론을 결합함으로써 복합적인 상황을 효과적으로 추론하는 방법을 제시하였다.

• 한국초등과학교육학회지:초등과학교육
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• 제27권3호
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• pp.233-243
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• 2008

The purpose of this study is to examine the effect of higher grades in elementary the science process skill and scientific attitudes by creative problem solving. To verify research problem, the subject of this study were sixth-grade students selected from two classes of an elementary school located in Ulsan : the experimental group is composed of thirty-two students who were participated in Treffinger's CPS teaching model situation, and the other is composed of thirty-two students(control group) who were participated in teacher map based learning situation. During six weeks, the CPS teaming-based instruction was executed In th experimental group while the teacher map based instruction in controled group. Post-test showed following results: first, the experimental group showed a significant improvement in the science process skill compared th the control group. Second, the experimental group did not showed a significant improvement in the science process skill compared th the control group. In conclusion, Treffinger's CPS teaching model was more effective than the teacher map based teaching model on science process skill. However, since the study has a limit on an object of the study and the applied curriculum, the additional studies need to be conducted with an extended comparative group and curriculum.

• 한국안전학회지
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• 제29권4호
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• pp.160-167
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• 2014

To determine a proper ASIL for each hazardous event with a proper safety goal, the right classes should first be determined for the three properties of the hazardous event; (i) severity of harm from the resultant accident, (ii) exposure to the relevant operational situation, and (iii) controllability to avoid the induced risks. ASIL can be clearly determined with right classes of these three properties. But no specific methodologies or processes for their classification can be found in ISO 26262, except only a rough guideline with a simplified set of illustrative tables. In this paper, we try to present a systematic model for classifying the three properties of the hazardous event and suggest a refined procedure of ASIL determination. The proposed model provides a specific method to get a more objective ASIL compared with that in the standard. Scrutinizing the current methodology, we develop a refined method and also provide an illustrative example.

• Journal of information and communication convergence engineering
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• 제9권4호
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• pp.379-384
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• 2011

The scope of the problems that could be solved by monitoring and the improvement of the recognition time is directly correlated to the performance of the management function of the business process. However, the current monitoring process of business activities decides whether to apply warnings or not by assuming a fixed environment and showing expressions based on the design rules. Also, warnings are applied by carrying out the measuring process when the event attribute values are inserted at every point. Therefore, there is a limit for distinguishing the range of occurrence and the level of severity in regard to the new external problems occurring in a complicated environment. Such problems cannot be ed. Also, since it is difficult to expand the range of problems which can be possibly evaluated, it is impossible to evaluate any unexpected situation which could occur in the execution period. In this paper, a process-evaluating model based on the goal scenario is suggested to provide constant services through the current monitoring process in regard to the service demands of the new scenario which occurs outside. The new demands based on the outside situation are analyzed according to the goal scenario for the process activities. Also, by using the meta-heuristic algorithm, a similar process model is found and identified by combining similarity and interrelationship. The process can be stopped in advance or adjusted to the wanted direction.

• 한국항해항만학회지
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• 제31권4호
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• pp.309-315
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• 2007

We've investigated the characteristics on mariner's behavior in the collision situation through a full-mission ship handling simulator and considered that it's necessary to model the standard avoiding behavior of mariners in order to apply the obtained results more widely and effectively. Thus we described the contents of standard avoiding behavior taken by mariners in the collision situation and established the concept of the standard model based on human factors for collision avoidance in a previous study. As a following study, this paper is to propose the method of modeling on mariners' standard behavior for collision avoidance by analyzing the contents of mariner's information processing and the related factors using regression analysis. As a result, we confirmed the influence of relating factors to avoiding behavior in mariner's deciding decisions and proposed the modeling method of mariners' standard behavior for collision avoidance with a example of recognition model.

• Smart Structures and Systems
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• 제16권1호
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• pp.101-139
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• 2015

In this paper, it is aimed to investigate the restoration effect on the structural behavior of masonry arch bridges. Dandalaz masonry arch bridge located on the 4km east of Karacasu town of Aydin, Turkey is selected as a numerical example. The construction year of the bridge is not fully known, but the bridge is dated back to 15th century. Considering the current situation, it can be easily seen that the structural elements such as arch, side walls and timber blocks are heavily damaged and the bridge is unserviceable. Firstly finite element model of the bridge is constituted to reflect the current situation (before restoration) using building survey drawings. After, restoration project is explained and finite element model is reconstituted (after restoration). The structural responses of the bridge are obtained before and after restoration under dead load, live load and dynamic earthquake loads. For both conditions, maximum displacements, maximum-minimum principal stresses and maximum-minimum elastic strains are given with detail using contours diagrams and compared with each other to determine the restoration effect. From the study, it can be seen that the maximum internal forces are consisted under dynamic loads before and after restoration. Also, the restoration projects and studies have important and positive effects on the structural response of the bridge to transfer these structures to future.

• 한국컴퓨터정보학회논문지
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• 제27권1호
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• pp.61-67
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• 2022

본 논문에서는 시뮬레이션 프로그램 리소스의 일부를 모바일 환경으로 전환시킬 수 있는 모델을 제안한다. 최근 제조업에서 PLC를 컨트롤러로 사용하는 스마트 팩토리가 급속하게 확산되고 있다. 그러나 PLC 운영 인력의 부족으로 운영에 대한 어려움을 겪고 있는 상황으로, PLC 운영 교육에 대한 플랫폼이 필요한 실정이다. 현재 PLC와 관련된 대부분의 교육 플랫폼들은 2D를 기반으로 하고 있어 정확한 학습이 어렵고, 일반적인 PC 환경에서 시뮬레이션 프로그램들을 원격 교육에 적용하면, 모니터 상에 많은 요소가 표현되어 화면 전환이 불편하다. 제안 모델의 실험 결과 일반적인 상황에서 프레임 저하가 없다는 것의 확인하였고, 요청 프레임에 따른 응답 시간은 평균 102ms 으로 학습자가 시스템 지연을 체감할 수준은 아닌 것으로 판단하였다.

• 한국IT서비스학회지
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• 제20권5호
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• pp.177-187
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• 2021

The global economy has been very difficult due to the recent impact of COVID-19. Korea is also pushing for strong quarantine policies such as K- quarantine and social distancing, but the economy is hardly recovering. In particular, the economic situation began to change rapidly depending on the export and domestic market, the public's interest in the economy increased, and companies became more sensitive. In order to estimate this rapidly changing economic situation, major advanced countries have also developed models that can periodically monitor the economy at the government level. Through this, by periodically reporting the economic trends, the public and companies can be aware of the economic trends to some extent. This study analyzed the cases of weekly business trends in advanced countries and developed a model of weekly economic activity suitable for Korea. To verify this, indices closely related to the economy such as mobility, industrial activity, face-to-face consumption, and psychology were discovered and estimated. As a result of the study, the weekly economic activity index was judged to be very useful in capturing short-term real economic activity. In the future, in order to secure the robustness and stability of the index and to increase the reflection of reality, model improvement and parameter estimation should be performed regularly.