• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.5
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• pp.1067-1075
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• 2015

With the recent increase of the number of mobile game users, the side effects such as the manipulation of game points, levels and game speed and payment fraud are emerging. Especially, the emulators which make it possible for mobile applications to run on PC is a great threat to mobile game security since debugging specific game application or automating the game playing can be done easier with them. Therefore, we research the efficient ways to detect widely used Android Emulators such as BlueStacks, GenyMotion, Andy, YouWave and ARC Welder from the perspective of client(app), game server and network to reduce threat to mobile game security.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.59-64
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• 2008

In this paper, stability and transparency analysis for client/server haptic-based networked virtual environment (NVE) is introduced. From this analysis the appropriate communication structure for the more stable and transparent haptic interactions can be derived. Also, it is possible to expect and compensate the quality deterioration of haptic interactions according to certain network conditions In order to verify the usefulness of the analysis, simple haptic-based NVE application is implemented. For the stability verification, the vibration or strange movement of haptic interface and virtual object are measured under various network states. In addition, the usefulness of the proposed transparency analysis and network delay compensation scheme is verified by comparing distorted and compensated force feedbacks with real force feedback.

• Journal of Korea Multimedia Society
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• v.8 no.3
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• pp.413-420
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• 2005

In this paper, we describe a design and implementation of Web Services that convert WML(Wireless Markup Language) Page into .NET Mobile Web Page. The Web Services has an advantage that is available everybody without restriction oi platform and programming language. In this paper, we implement the Web Services Provider providing of converting system and the Web Services Consumer using this system. The Clients can get results of .NET Mobile Web Page without difficulty through Web Server because of implementation of Web Services Consumer using Web Services. Also the clients can develop new application using Web Services without respect of its implement process.

• Journal of Korea Multimedia Society
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• v.5 no.6
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• pp.638-645
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• 2002

One of the potential advantages of computer-based instruction is individualization of instruction. However, this goal has not been fully realized in practice, due largely to limitations of natural language understanding and to combinatorial explosion. It is nonetheless possible to develop CAT(Computer- based Adaptive Testing) Programs which can adapt to students, depending on their performance, by adjusting the length of computer-based tests. The number of questions can be significantly reduced for many individuals, while mastery and nonmastery decisions remain highly accurate. In this paper, We design and implement a Diagnosis System using SPRT(Sequential Probability Ratio Testing). This system supports multimedia object, client/server environment, indvidual feedback, multi-SPRT and maintain student model for individualization of instruction. besides, this system measures coefficient alpha of each problem.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.2
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• pp.167-173
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• 2002

The VMSS(Virtual Makeup Simulation System) is a virtual simulation system which can apply makeup, hair style, accessory to user's own face image through internee connection. The simulation result can be stored to server side DB and also can be printed out on client side printer. It is implemented using Java so, clients don't need any other client program to run the VMSS except Web browser and Java Plug-in installed on browser. IIS (Internet Information Server) Web server of Window 2000 and MS-SQL 7 are used to develop the overall system. Commercial JDBC Driver Type 4 is used to connect the applet and DB. It suggests a new direction of Web-based contents service development and can be applied to many other areas.

• 한국공간정보시스템학회:학술대회논문집
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• 1999.06a
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• pp.35-45
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• 1999

기존에는 이질적인 GIS 데이타 소스간의 통합을 위해 랩퍼(wrapper)기술을 사용했다. 랩퍼(wrapper)는 외부 클라이언트 응용프로그램에게 이질적인 데이타 소스들의 통합 데이타 모델을 제공함으로써 데이타와 지리정보처리의 공유를 가능하게 한다. 그러나 데이타 소스들의 통합은 표준 서비스를 포함한 상호운용성을 지원하는 것은 아니다. 표준을 따르는 상호운용을 위해서는 표준화된 데이타 모델과 서비스가 필요한데 OGC (OpenGIS Consortium)의 OpenGIS(Open Geodata Interoperability Specification)가 이를 제공하고 있다. 분산환경에서 상호운용을 위한 기존방법은 각 데이타 소스별로 데이타 제공자를 개발하여 상호운용을 지원하였다. 따라서 중복 구현에 대한 문제와 구현에 따른 노력과 비용이 상당 부분 존재하였다. 본 논문에서는 데이타 제공자에서 공통부분을 추출 및 컴포넌트 화하고 데이타 소스에 종속되는 모듈은 CORBA 구현객체로 작성하여 제시하였다. 따라서 각 데이타 소스들은 표준 데이타 제공자를 통해서 기존의 데이타 지원 기능유지와 상호운용성을 달성할 수 있다. 클라이언트는 OpenGIS Feature모델을 기반으로 한 표준 인터페이스로 데이타 소스에 접근한다. 데이타 소스는 표준데이타 제공자와 정의된 인터페이스를 바탕으로 CORBA의 구현 객체 서버를 작성함으로서 중복구현 및 구현부담을 줄일 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.4C
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• pp.441-447
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• 2004

Information security simulator is required for the study on the cyber intrusion and defense as information security has been increasingly popular Until now, the main purposes of information security simulation are security estimation of small network as well as performance analysis of information protection systems. However, network simulators that can simulate attacks in a huge network are in needs since large scale internet attacks are very common in these days. In this paper we proposed a simulator design and its implementation details. Our simulator is implemented by expanding the SSFNet program to the client-sewer architecture. A cyber attack scenario used in our simulator is composed by the advanced attack tree model. We analyzed the simulation results to show the correctness of our network defense simulator.

• Journal of Korea Game Society
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• v.15 no.3
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• pp.177-188
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• 2015

In-game cheating by the use of unauthorized software programs has always been a big problem that they can damage in First Person Shooting games, although companies operate a variety of client security solutions in order to prevent games from the cheating attempts. This paper proposes a method for detecting cheaters in FPS games by using game log analysis in a server-side. To accomplish this, we did a comparative analysis of characteristics between cheaters and general users focused on commonly loaded logs in the game. We proposed a cheating detection model by using artificial neural network algorithm. In addition, we did the performance evaluation of the proposed model by using the real dataset used in business.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.561-564
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• 2018

최근 빠르게 발생하는 빅데이터 스트림이 다양한 분야에서 활용되고 있다. 이러한 빅데이터 전체를 수집하고 처리하는 것은 매우 비경제적이므로, 데이터 스트림 중 필요한 데이터를 걸러내는 필터링 과정이 필요하다. 본 논문에서는 아파치 스톰(Apache Storm)을 사용하여 데이터 스트림의 질의 필터링 시스템을 구축한다. 스톰은 대용량 데이터 스트림을 처리하기 위한 실시간 분산 병렬 처리 프레임워크이다. 하지만, 스톰은 입력 데이터 구조나 알고리즘 변경 시, 코드의 수정과 재배포, 재시작 등이 필요하다. 따라서, 본 논문에서는 이 같은 문제를 해결하기 위해 아파치 카프카(Apache Kafka)를 사용하여 데이터 수집 모듈과 스톰의 처리 모듈을 분리함으로써 시스템의 가용성을 크게 높인다. 또한, 시스템을 웹 기반 클라이언트-서버 모델로 구현하여 사용자가 언제 어디에서든 질의 필터링 시스템을 사용할 수 있게 하며, 웹 클라이언트를 통해 입력한 질의를 자동적 분석하는 쿼리 파서를 구현하여 별도의 프로그램의 수정 없이 질의 필터링을 적용할 수 있다.

• The KIPS Transactions:PartD
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• v.9D no.3
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• pp.447-456
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• 2002

Web applications haute different structural characteristics from conventional applications. A web application typically consists of server-side script elements which run on web sowers, client-side script elements which run on the client web-browser, link elements that the user clicks, and event elements that connect user-triggered request to the client script elements. These four elements are combined to form a web application. In such environments, direct application of conventional methods for measuring application complexity may not be possible, because they are primarily designed to measure complexity of modules and classes. In this paper, therefore, we propose metrics of Cyclomatic Complexity for Web Application (CCWA). We developed a tool to measure such metrics and applied it to the real-world examples. We found that the proposed CCWA metrics can be used for measuring complexity of highly complex web applications, which is not possible with conventional module and class based measurement techniques.