• IEIE Transactions on Smart Processing and Computing
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• 제5권2호
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• pp.94-99
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• 2016

Application layer attacks have for years posed an ever-serious threat to network security, since they always come after a technically legitimate connection has been established. In recent years, cyber criminals have turned to fully exploiting the web as a medium of communication to launch a variety of forbidden or illicit activities by spreading malicious automated software (auto-ware) such as adware, spyware, or bots. When this malicious auto-ware infects a network, it will act like a robot, mimic normal behavior of web access, and bypass the network firewall or intrusion detection system. Besides that, in a private and large network, with huge Hypertext Transfer Protocol (HTTP) traffic generated each day, communication behavior identification and classification of auto-ware is a challenge. In this paper, based on a previous study, analysis of auto-ware communication behavior, and with the addition of new features, a method for classification of HTTP auto-ware communication is proposed. For that, a Not Only Structured Query Language (NoSQL) database is applied to handle large volumes of unstructured HTTP requests captured every day. The method is tested with real HTTP traffic data collected through a proxy server of a private network, providing good results in the classification and detection of suspicious auto-ware web access.

• 전자공학회논문지 IE
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• 제48권3호
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• pp.26-32
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• 2011

본 논문은 화재라는 특수한 상황에서 대피자를 로봇에 비유하여 퍼텐셜 필드 방식으로 최적의 대피 경로를 탐색하는 방식을 제안한다. 장애물은 화재가 발생된 위치를 나타내게 되며, 한정된 공간에서 센서를 통해 화재가 발생한 위치를 확인할 수 있어서 전역적인 탐색이 가능해진다. 건물 내에 설치된 화재 감지 센서와 복합 감지 센서로부터 상황 정보를 습득하여 무선으로 서버에 전송하면 퍼텐셜 필드 방식으로 최적의 대피 경로를 탐색하여 유도등을 대피 방향으로 동작시키며 스마트 폰과 같은 모바일 단말에 무선을 이용하여 대피 경로 정보를 표시할 수 있게 된다. 시뮬레이션 환경에서 제안한 화재 대피 알고리즘의 기능 및 성능 테스트를 통해 제안 알고리즘의 성능을 확인할 수 있었다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1997년도 춘계 학술대회 발표집
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• pp.23-28
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• 1997

We discuss development of a simulator for automated manufacturing systems (AMSs) which have sophisticated automated material handling equipments and complicated work flows. The simulator is designed to satisfy the following requirements. A user should be able to easily configure or specify an AMS through a graphical user interface (GUI) and minimal data input. The user should be able to model diverse and complied control logic for automated material handling systems like automated guided vehicle (AGV) systems, robot workcell systems and conveyor systems as well as complicated job flow program. Real time animation is desired. Finally, the simulator should be easily maintained and extended. To satisfy the requirements, we use an object-oriented paradigm for modeling, designing, and programming of the simulator. We use an object-oriented modeling framework to design the modeling elements library, and take the process interaction approach for scheduling processes and events. To model a user-defined diverse control logic, we also develop a script language and its interpreter. We explain design and implementation strategies. We implement the simulator using Visual C++ 4.2 and Open GL on Windows NT and the Windows95. Some modeling examples will be demonstrated.

• International Journal of Computer Science & Network Security
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• 제22권9호
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• pp.15-22
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• 2022

The Tactile Internet technology is considered as the evolution of the internet of things. It will enable real time applications in all fields like remote surgery. It requires extra low latency which must not exceed 1ms, high availability, reliability and strong security system. Since it appearance in 2014, tremendous efforts have been made to ensure authentication between sensors, actuators and servers to secure many applications such as remote surgery. This human to machine relationship is very critical due to its dependence of the human live, the communication between the surgeon who performs the remote surgery and the robot arms, as a tactile internet actor, should be fully and end to end protected during the surgery. Thus, a secure mutual user authentication framework has to be implemented in order to ensure security without influencing latency. The existing methods of authentication require server to stock and exchange data between the tactile internet entities, which does not only make the proposed systems vulnerables to the SPOF (Single Point of Failure), but also impact negatively on the latency time. To address these issues, we propose a lightweight authentication protocol for remote surgery in a Tactile Internet environment, which is composed of a decentralized blockchain and physically unclonable functions. Finally, performances evaluation illustrate that our proposed solution ensures security, latency and reliability.

• 로봇학회논문지
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• 제8권1호
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• pp.51-57
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• 2013

Recently, the number of jellyfish has been rapidly grown because of the global warming, the increase of marine structures, pollution, and etc. The increased jellyfish is a threat to the marine ecosystem and induces a huge damage to fishery industries, seaside power plants, and beach industries. To overcome this problem, a manual jellyfish dissecting device and pump system for jellyfish removal have been developed by researchers. However, the systems need too many human operators and their benefit to cost is not so good. Thus, in this paper, the design, implementation, and experiments of autonomous jellyfish removal robot system, named JEROS, have been presented. The JEROS consists of an unmanned surface vehicle (USV), a device for jellyfish removal, an electrical control system, an autonomous navigation system, and a vision-based jellyfish detection system. The USV was designed as a twin hull-type ship, and a jellyfish removal device consists of a net for gathering jellyfish and a blades-equipped propeller for dissecting jellyfish. The autonomous navigation system starts by generating an efficient path for jellyfish removal when the location of jellyfish is received from a remote server or recognized by a vision system. The location of JEROS is estimated by IMU (Inertial Measurement Unit) and GPS, and jellyfish is eliminated while tracking the path. The performance of the vision-based jellyfish recognition, navigation, and jellyfish removal was demonstrated through field tests in the Masan and Jindong harbors in the southern coast of Korea.

• 한국산학기술학회논문지
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• 제21권11호
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• pp.851-860
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• 2020

인구 고령화와 건강 복지에 대한 사회적 관심이 높아지면서 재활복지기를 포함한 실버 및 헬스케어 산업과 관련한 연구들이 활발하게 진행되고 있다. 본 연구에서는 기존에 1차적으로 설계·제작되었던 이·승강 전동휠체어를 사용자 측면에서 보다 더 안전성과 편의성을 갖도록 개선하고자 하였다. 사용자 체형을 고려한 헤드레스트 높이조절 기능의 시트 디자인, 사용성 증대를 위한 암레스트의 길이조절 및 95° 회전 기능, 사용자 탑승 편의성을 위한 바닥까지의 시트하강 및 운행 시 승강할 수 있는 기능, 캐스터 회전반경 및 안전성 증대를 위한 발판 추가 및 풋레스트 길이 조절 기능, 승·하강 시 흔들림 방지를 위한 프레임 및 승·하강 링크 설계 등을 개선시켰다. 또한 안전주행을 위한 컨트롤러 및 드라이브 부문과 사용자 편의성 측면의 기능들을 추가적으로 설계·제작하였다. 추가 기능을 보완하여 제작된 실내 전동휠체어의 동작 상태를 평가하기 위해 구동 실험을 수행하였다. 연속 주행시간, 회전반경, 승·하강 최대 하중, 최대 승강 높이, 소음레벨, 운행 보조센서 센싱 최소거리, 서버 및 앱 프로그램 상호연동 및 기기호환성, 듀티 사이클 최대 오차율의 성능실험을 수행하였다. 실험 결과, 더 개선하여 설계·제작한 전동휠체어는 시험 목표 값을 달성하였으며, 성공적으로 동작하는 것을 확인할 수 있었다. 향후 연구로는 개선하여 제작된 이·승강 전동휠체어에 대해 사용자 측면에서의 사용성 평가를 수행할 것이다.

• 유통과학연구
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• 제11권2호
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• pp.45-55
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• 2013

Purpose - The development and implementation of OSS (Open Source Software) led to a dramatic change in corporate IT infrastructure, from system server to smart phone, because the performance, reliability, and security functions of OSS are comparable to those of commercial software. Today, OSS has become an indispensable tool to cope with the competitive business environment and the constantly-evolving IT environment. However, the use of OSS is insufficient in small and medium-sized companies and software houses. This study examines the need for OSS Intermediaries in the Software Distribution Channel. It is expected that the role of the OSS Intermediary will be reduced with the improvement of the distribution process. The purpose of this research is to prove that OSS Intermediaries increase the efficiency of the software distribution market. Research design, Data, and Methodology - This study presents the analysis of data gathered online to determine the extent of the impact of the intermediaries on the OSS market. Data was collected using an online survey, conducted by building a personal search robot (web crawler). The survey period lasted 9 days during which a total of 233,021 data points were gathered from sourceforge.net and Apple's App store, the two most popular software intermediaries in the world. The data collected was analyzed using Google's Motion Chart. Results - The study found that, beginning 2006, the production of OSS in the Sourceforge.net increased rapidly across the board, but in the second half of 2009, it dropped sharply. There are many events that can explain this causality; however, we found an appropriate event to explain the effect. It was seen that during the same period of time, the monthly production of OSS in the App store was increasing quickly. The App store showed a contrasting trend to software production. Our follow-up analysis suggests that appropriate intermediaries like App store can enlarge the OSS market. The increase was caused by the appearance of B2C software intermediaries like App store. The results imply that OSS intermediaries can accelerate OSS software distribution, while development of a better online market is critical for corporate users. Conclusion - In this study, we analyzed 233,021 data points on the online software marketplace at Sourceforge.net. It indicates that OSS Intermediaries are needed in the software distribution market for its vitality. It is also critical that OSS intermediaries should satisfy certain qualifications to play a key role as market makers. This study has several interesting implications. One implication of this research is that the OSS intermediary should make an effort to create a complementary relationship between OSS and Proprietary Software. The second implication is that the OSS intermediary must possess a business model that shares the benefits with all the participants (developer, intermediary, and users).The third implication is that the intermediary provides an OSS of high quality like proprietary software with a high level of complexity. Thus, it is worthwhile to examine this study, which proves that the open source software intermediaries are essential in the software distribution channel.

• 한국산학기술학회논문지
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• 제20권10호
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• pp.415-424
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• 2019

최근 고령인구의 증가로 인해 실내 외에서 고령자들이 편리하게 생활할 수 있는 다양한 재활복지기기에 대한 관심이 증가하고 있다. 본 논문에서는 거동이 불편한 노인 또는 장애인들 스스로가 좁은 실내에서 안전하고 편리하게 이동과 이승이 가능하도록 최소 회전반경과 문턱 극복을 포함하여 설계 제작하였다. 좌식문화가 발전한 실내 환경에서 골절질환, 노인질환 및 기타 무릎, 허리질환을 가진 사용자의 이승 편의성을 제공하고자 하였다. 먼저 실내에서 이 승강이 가능하도록 프레임에 기본적으로 링크, 시트, 암레스트, 커버, 모터, 감속기, 배터리, 충전기, 센서, 컨트롤러 기구물 등을 부착하였다. 사용자의 환경과 신체적 특징을 고려하여 제품 디자인과 구조물을 설계하였으며, 고령자 또는 장애인이 실내에서 일상생활을 지원할 수 있도록 IoT 기능을 추가하였다. 제작된 실내 이 승강 휠체어의 동작성능을 확인하기 위해 구동실험을 수행하였다. 연속 주행시간, 회전반경, 액추에이터 최대부하, 최대 승강 높이, 음압레벨, 운행 보조센서 센싱 최소거리, 서버 및 앱 프로그램 상호 연동과 기기호환성, 듀티 사이클 오차율 시험성능 테스트를 수행하였다. 시험결과, 제작된 휠체어는 각 항목의 성능시험 목표 값을 달성하였으며, 성공적으로 작동하는 것으로 나타났다.