• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제12권8호
• /
• pp.3946-3965
• /
• 2018

Network anomaly detection in Software Defined Networking, especially the detection of DDoS attack, has been given great attention in recent years. It is convenient to build the Traffic Matrix from a global view in SDN. However, the monitoring and management of high-volume feature-rich traffic in large networks brings significant challenges. In this paper, we propose a moving window Principal Components Analysis based anomaly detection and mitigation approach to map data onto a low-dimensional subspace and keep monitoring the network state in real-time. Once the anomaly is detected, the controller will install the defense flow table rules onto the corresponding data plane switches to mitigate the attack. Furthermore, we evaluate our approach with experiments. The Receiver Operating Characteristic curves show that our approach performs well in both detection probability and false alarm probability compared with the entropy-based approach. In addition, the mitigation effect is impressive that our approach can prevent most of the attacking traffic. At last, we evaluate the overhead of the system, including the detection delay and utilization of CPU, which is not excessive. Our anomaly detection approach is lightweight and effective.

• 한국인터넷방송통신학회논문지
• /
• 제20권6호
• /
• pp.59-64
• /
• 2020

최근 노인 인구가 급격하게 증가하면서 의료시설 내외에서 환자의 안전을 모니터링하는 시스템에 대한 요구가 증가하고 있다. 센서 및 정보통신기술의 발달로 치매 환자를 위한 다양한 모니터링 시스템이 제안되고 있지만 치매 환자에게 부착되는 장치에 의존하여 단편적인 기능을 제공하는 것에 그치고 있다. 본 논문에서는 환자의 상태를 모니터링하는 스마트 기기에서부터 사용자 편의적인 UI/UX, 병원정보시스템 연동까지 포함하는 통합시스템을 설계한다. 제안된 시스템을 통해서 의료진과 보호자는 환자의 상태와 관련된 정보를 실시간으로 전달받을 수 있으며 실내외에서도 치매 환자의 위치를 추적할 수 있다.

• 대한의용생체공학회:의공학회지
• /
• 제44권1호
• /
• pp.19-24
• /
• 2023

Due to the spread of COVID-19, many patients with severe respiratory diseases have occurred worldwide, and accordingly, the use of mechanical ventilators has exploded. However, hospitals do not have systematic risk management, and the Medical Device Regulation also provides medical device risk management standards for manufacturers, but does not apply to devices in use. In this paper, we applied the Failure Mode Effects Analysis (FMEA) risk analysis technique based on the International Standard ISO 14971 (Medical Devices-Application of risk management to medical devices) for 85 mechanical ventilators of a specific model in use in hospitals. Failure modes and effects of each parts were investigated, and risk priority was derived through multiplication of each score by preparing criteria for severity, occurrence, and detection for each failure mode. As a result, it was confirmed that the microprocessor-based Patient Unit/Monitoring board in charge of monitoring scored the highest score with 36 points, and that reliability management is possible through systematic risk management according to priority.

• 인간식물환경학회지
• /
• 제22권2호
• /
• pp.219-229
• /
• 2019

This study was carried out to verify the accuracy of fitness tracking devices in monitoring heart rate and energy consumption and to contribute to the development of a forest exercise program that can recommend the intensity and amount of forest exercises based on personal health-related data and provide monitoring and feedback on forest exercises. Among several commercially available wearable devices, Fitbit was selected for the research, as it provides Open API and data collected by Fitbit can be utilized by third parties to develop programs. Fitbit provides users with various information collected during forest exercises including exercise time and distance, heart rate, energy consumption, as well as the altitude and slope of forests collected by GPS. However, in order to verify the usability of the heart rate and energy consumption data collected by Fitbit in forest, the accuracy of heart rate and energy consumption were verified by comparing the data collected by Fitbit and reference. In this study, 13 middle-aged women were participated, and it was found that the heart rate measured by Fitbit showed a very low error rate and high correlation with that measured by the reference. The energy consumption measured by Fitbit was not significantly different from that measured in the reference, but the error rate was slightly higher. However, there was high correlation between the results measured by Fibit and the reference, therefore, it can be concluded that Fitbit can be utilized in developing actual forest exercise programs.

• International Journal of Internet, Broadcasting and Communication
• /
• 제15권4호
• /
• pp.250-260
• /
• 2023

In this paper, we designed a IoT(Internet of Things) sensor block embedded lightweight house deck structures that can be implemented using Carbon Fiber Reinforced Polymer(CFRP). Deck-Sensor interconnection interface block via IoT connectivity Hub that can mount external environmental sensors such as fire sensors on the Deck body itself was also proposed. Additionally we described the configuration of devices for data acquisition and analysis based on IoT environmental detection sensors that can be commonly installed and used on these deck bodies. On the other hand, received sensing data based monitoring user interface(UI) also developed and used for sensing data analysis for remote monitoring center. Through the implementation of such IoT-based sensor data transmission and collection analysis devices and UI software, this paper confirmed the availability of CFRP based lightweight House deck structure and possibility of CFRP deck-based IoT sensor data networking and analysis functions.

• 한국정보통신학회논문지
• /
• 제9권5호
• /
• pp.1039-1044
• /
• 2005

원격 제어 모니터링 시스템을 위한 임베디드 리눅스 시스템의 다중 채널 직렬 장치를 설계하였다. 제안된 장치는 다중 채널 직렬 장치의 효과적인 데이터 처리를 위해 내부에 FIFO, Sate Machine, 인터럽트로 구성되어 있으며 임베디드 리눅스에서 효과적인 디바이스 프로그램을 가능하게 한다. 다중 채널 직렬 장치의 기존의 접근 방식은 개별 직렬 장치를 일일이 접근하고 있으나 본 장치에서는 다중 채널 직렬 장치를 한 개의 직렬 장치로 간주하여 접근하는 것과 같은 효과를 볼 수 있다. 본 장치는 다중 채널 직렬 입출력 구동에 효율적이며 기존의 다중 채널 직렬 장치 보다 접근 속도가 빠르다. 본 장치는 수질 측정과 같은 센서들 사이의 거리가 멀거나 센서와 모니터링 시스템의 사이의 거리가 먼 원격 제어 모니터링에 효과적이다.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
• /
• pp.277.2-277.2
• /
• 2014

For next-generation electronic applications, human-machine interface devices have recently been demonstrated such as the wearable computer as well as the electronic skin (e-skin). For integration of those systems, it is essential to develop many kinds of components including displays, energy generators and sensors. In particular, flexible sensing devices to detect some stimuli like strain, pressure, light, temperature, gase and humidity have been investigated for last few decades. Among many condidates, a pressure sensing device based on organic field-effect transistors (OFETs) is one of interesting structure in flexible touch displays, bio-monitoring and e-skin because of their flexibility. In this study, we have investigated a flexible e-skin based on highly sensitive, pressure-responsive OFETs using microstructured ferroelectric gate dielectrics, which simulates both rapidly adapting (RA) and slowly adatping (SA) mechanoreceptors in human skin. In SA-type static pressure, furthermore, we also demonstrate that the FET array can detect thermal stimuli for thermoreception through decoupling of the input signals from simultaneously applied pressure. The microstructured highly crystalline poly(vinylidene fluoride-trifluoroethylene) possessing piezoelectric-pyroelectric properties in OFETs allowed monitoring RA- and SA-mode responses in dyanamic and static pressurizing conditions, which enables to apply the e-skin to bio-monitoring of human and robotics.

• 한국통신학회논문지
• /
• 제37권4C호
• /
• pp.321-328
• /
• 2012

스마트폰과 같은 모바일 장치는 휴대가 간편한 소형 컴퓨팅 장치로서 기존 컴퓨터에서 수행하던 작업을 수행할 수 있으며 맞춤형 개인화 서비스가 가능하여 널리 활용되고 있다. 모바일 장치에서 동작하는 모바일 애플리케이션은 모바일 플랫폼의 특성에 따라서 호환성이 떨어지기는 특징을 가지기 때문에 해당 플랫폼을 지원하기 위해서는 플랫폼에 맞게 다시 개발해야 하는 제약사항을 가진다. 본 논문에서는 이를 해결하기 위해서 표준 웹 개발 언어인 HLTML5와 자바스크립트 라이브러리인 jQuery를 이용하여 다양한 모바일 플랫폼에서 호환성을 가지는 유비쿼터스 헬스케어 모니터링 시스템을 구현하였다. 구현된 시스템은 모바일 플랫폼뿐만 아니라 데스크톱 컴퓨터에서도 호환성을 가지기 때문에 다양한 환경에서 활용이 가능하다.

• Journal of Platform Technology
• /
• 제6권4호
• /
• pp.41-48
• /
• 2018

영유아 관련 사고는 빈번하게 발생하고 있으며 초동 조치가 원활하지 않을 경우 더 큰 사고로 이어질 수 있다. 신속한 초동 조치를 위해서는 적절한 모니터링 시스템이 요구되며, 아동의 생체 상태에 대한 정확한 모니터링과 긴급한 상황 발생에 대해서 즉각적인 통보가 가능한 시스템의 구축이 필요하다. 최근 IoT 기술의 발전과 더불어 다양한 형태의 센서들이 초소형으로 개발되고 있으며 스마트 폰의 발전과 더불어 스마트 폰과의 연계된 웨어러블 디바이스의 개발이 가속화 되고 있다. 이러한 웨어러블 디바이스를 사용하여 영유아 사고의 위험을 줄이고 사고 발생시 신속한 대응이 가능해 진다. 본 논문에서는 영유아 상태에 대한 모니터링이 가능한 웨어러블 시스템을 제안하고 영유아 사고를 예방하기 위한 서비스를 제시한다.

• International Journal of Computer Science & Network Security
• /
• 제23권3호
• /
• pp.31-48
• /
• 2023

The popularization of smart devices and subsequent optimization of their sensing capacity has resulted in a novel mobile crowdsensing (MCS) pattern, which employs smart devices as sensing nodes by recruiting users to develop a sensing network for multiple-task performance. This technique has garnered much scholarly interest in terms of sensing range, cost, and integration. The MCS is prevalent in various fields, including environmental monitoring, noise monitoring, and road monitoring. A complete MCS life cycle entails task allocation, data collection, and data aggregation. Regardless, specific drawbacks remain unresolved in this study despite extensive research on this life cycle. This article mainly summarizes single-task, multi-task allocation, and space-time multi-task allocation at the task allocation stage. Meanwhile, the quality, safety, and efficiency of data collection are discussed at the data collection stage. Edge computing, which provides a novel development idea to derive data from the MCS system, is also highlighted. Furthermore, data aggregation security and quality are summarized at the data aggregation stage. The novel development of multi-modal data aggregation is also outlined following the diversity of data obtained from MCS. Overall, this article summarizes the three aspects of the MCS life cycle, analyzes the issues underlying this study, and offers developmental directions for future scholars' reference.