• Title/Summary/Keyword: 통신장애

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Healthcare Research for Sexual Satisfaction of Women Using Questionnaire of Smartphone SNS (스마트 폰 SNS 설문조사 통해 알아본 여성의 성 만족도에 관한 헬스케어 연구)

  • Moon, Jong-Hoon;Heo, Sung-Jin;Na, Chang-Ho;Kim, Sung-Hyeon;Kang, So-La;Kim, Hee-Jin
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.5
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    • pp.941-956
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    • 2017
  • This study aimed to compare the differences in sexual function and sexual preference according to demographic characteristics of women, sexual experience, preference penile type, and sexual dysfunction. 72 adult women responded to the survey. 54 respondents were analyzed except respondents who did have incomplete response and no sexual experience. All collected data were analyzed using independent t-test and chi-square test using SPSS 22. In results, Married was significantly higher in intercourse frequency and sexual function than unmarried(p<.05). In economic status, high or middle was significantly higher in the subjective sexual experience and sexual function than the low(p<.05). In subjective sexual experience, high was higher in intercourse frequency than the low, and penile length and type were important(p<.05). preference of glans> penis was significantly higher in subjective sexual experience than preference of glans .. penis, and importance of penile girth and size(p<.05). In sexual function, normal function was lower in intercourse frequency than dysfunction, and penile length was not considered significant(p<.05). The results of this study suggest that there may be differences in sexual function and sexual preference according to various causes and can be used as basic data for the development of psychological counseling program for sexual function rehabilitation of women.

Reliable Methods of Interoperability between Packet Transport Networks and IP Networks (고신뢰성을 보장하는 패킷전달망-IP망 상호연동 방법)

  • Lee, Kwang-Koog;Lee, Hosong;Lee, Youngwuk;Jeong, Kitae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.10
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    • pp.34-40
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    • 2014
  • With the economical data service delivery, the packet transport network (PTN) technologies have emerged as an important player in the next-generation transport networks. As the PTN continues to make such considerable progress, it is being challenged by network providers who need rapid and reliable recovery capabilities to guarantee the availability of their services. This paper introduces several fault detection mechanisms for a client signal failure in packet transport networks and proposes a reliable transmission method of IP flows from routers using the combination of Ethernet services. Based on the first fault detection methods, client signal fault is detected within tens or hundreds of milliseconds. It enables the client network devices to perform their own recovery processes within one second. The second mechanism enables failed Ethernet services to be bypassed via other Ethernet services over disjoint paths, so as to contribute on reducing packet loss of IP traffic.

Adaptive Consensus Bound PBFT Algorithm Design for Eliminating Interface Factors of Blockchain Consensus (블록체인 합의 방해요인 제거를 위한 Adaptive Consensus Bound PBFT 알고리즘 설계)

  • Kim, Hyoungdae;Yun, Jusik;Goh, Yunyeong;Chung, Jong-Moon
    • Journal of Internet Computing and Services
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    • v.21 no.1
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    • pp.17-31
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    • 2020
  • With the rapid development of block chain technology, attempts have been made to put the block chain technology into practical use in various fields such as finance and logistics, and also in the public sector where data integrity is very important. Defense Operations In addition, strengthening security and ensuring complete integrity of the command communication network is crucial for operational operation under the network-centered operational environment (NCOE). For this purpose, it is necessary to construct a command communication network applying the block chain network. However, the block chain technology up to now can not solve the security issues such as the 51% attack. In particular, the Practical Byzantine fault tolerance (PBFT) algorithm which is now widely used in blockchain, does not have a penalty factor for nodes that behave maliciously, and there is a problem of failure to make a consensus even if malicious nodes are more than 33% of all nodes. In this paper, we propose a Adaptive Consensus Bound PBFT (ACB-PBFT) algorithm that incorporates a penalty mechanism for anomalous behavior by combining the Trust model to improve the security of the PBFT, which is the main agreement algorithm of the blockchain.

An Optimization Model and Heuristic Algorithms for Multi-Ring Design in Fiber-Optic Networks (광전송망에서의 다중링 설계를 위한 최적화 모형 및 휴리스틱 알고리즘)

  • 이인행;이영옥;정순기
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.1B
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    • pp.15-30
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    • 2000
  • The important considerations in the design of fiber-optic networks are reliability and survivability preparing against a failure. The SDH(Synchronous Digital Hierarchy), the international standard of optical transmission, offers several network reconfiguration methods that enable network to be automatically restored from failure. One of the methods is the SHR(Self Healing Ring), which is a ring topology system. Most network providers have constructed their backbone networks with SHR architecture since it can provide survivability economically. The network architecture has eventually evolved into a multi-ring network comprised of interconnected rings. This paper addresses multi-ring network design problems is to minimize ring-construction cost. This problem can be formulated with MIP(mixed integer programming) model. However, it is difficult to solve the model within reasonable computing time on a large scale network because the model is NP-complete. Furthermore, in practice we should consider the problem of routing demands on rings to minimize total cost. This routing problem involves multiplex bundling at the intermediate nodes. A family of heuristic algorithms is presented for this problem. These algorithms include gateway selection and routing of inter-ring demands as well as load balancing on single rings. The developed heuristic algorithms are applied to some network provider's regional and long-distance transmission networks. We show an example of ring design and compare it with another ring topology design. Finally, we analysis the effect bundling.

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Implementation of Smart Device-Based on Platform for the Visually Impaired (시각 장애인을 위한 스마트 장치 기반 플랫폼 구현)

  • Lee, Ook;Choi, Jung-Woon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.538-549
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    • 2019
  • This study suggests a new platform in which VI can communicate with their guardians who serve as a system administrator optimizing personal characteristics. In terms of interaction between platform components, this study can contribute to enhancing stability of walking by giving substantial information to VI through server processing and setups of guardians with real-time interaction to VI through server processing and setups of guardians with real-time interaction. Therefore, developing smart phone applications can facilitate both portability and cost effectiveness, by the users' downloading the application and registration. In terms of guardians' cost, this system is cost-effective because they can access to the administration system through personal computers or smart phones, not through specialized system devices. This system is web-based, which automatically communicates with the surroundings of, such as provides the guardians with the necessary information or approaches to the danger through IoT devices, which results in enhancing safety. Moreover, it is possible for guardians to utilize the personalized platform since the system not only senses personal characteristics but also sends a number of information to VI. a new platform makes it possible for guardians to provide electronic support and interaction with the application with the application users, which contributes to systematic and safe walk for VI.

A System Recovery using Hyper-Ledger Fabric BlockChain (하이퍼레저 패브릭 블록체인을 활용한 시스템 복구 기법)

  • Bae, Su-Hwan;Cho, Sun-Ok;Shin, Yong-Tae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.2
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    • pp.155-161
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    • 2019
  • Currently, numerous companies and institutes provide services using the Internet, and establish and operate Information Systems to manage them efficiently and reliably. The Information System implies the possibility of losing the ability to provide normal services due to a disaster or disability. It is preparing for this by utilizing a disaster recovery system. However, existing disaster recovery systems cannot perform normal recovery if files for system recovery are corrupted. In this paper, we proposed a system that can verify the integrity of the system recovery file and proceed with recovery by utilizing hyper-ledger fabric blockchain. The PBFT consensus algorithm is used to generate the blocks and is performed by the leader node of the blockchain network. In the event of failure, verify the integrity of the recovery file by comparing the hash value of the recovery file with the hash value in the blockchain and proceed with recovery. For the evaluation of proposed techniques, a comparative analysis was conducted based on four items: existing system recovery techniques and data consistency, able to data retention, recovery file integrity, and using the proposed technique, the amount of traffic generated was analyzed to determine whether it was actually applicable.

Detection of Tracheal Sounds using PVDF Film and Algorithm Establishment for Sleep Apnea Determination (PVDF 필름을 이용한 기관음 검출 및 수면무호흡 판정 알고리즘 수립)

  • Jae-Joong Im;Xiong Li;Soo-Min Chae
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.2
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    • pp.119-129
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    • 2023
  • Sleep apnea causes various secondary disease such as hypertension, stroke, myocardial infarction, depression and cognitive impairment. Early detection and continuous management of sleep apnea are urgently needed since it causes cardio-cerebrovascular diseases. In this study, wearable device for monitoring respiration during sleep using PVDF film was developed to detect vibration through trachea caused by breathing, which determines normal breathing and sleep apnea. Variables such as respiration rate and apnea were extracted based on the detected breathing sound data, and a noise reduction algorithm was established to minimize the effect even when there is a noise signal. In addition, it was confirmed that irregular breathing patterns can be analyzed by establishing a moving threshold algorithm. The results show that the accuracy of the respiratory rate from the developed device was 98.7% comparing with the polysomnogrphy result. Accuracy of detection for sleep apnea event was 92.6% and that of the sleep apnea duration was 94.0%. The results of this study will be of great help to the management of sleep disorders and confirmation of treatment by commercialization of wearable devices that can monitor sleep information easily and accurately at home during daily life and confirm the progress of treatment.

Smart Goggles for the Visually Impaired using UWB (UWB를 활용한 시각장애인용 스마트고글)

  • Dae-Hoon Kim;Dinh-Nam Le;Chan-Hee Lee;Chan-Hwi Jung;In-Jae Hwang;Boong-Joo Lee
    • The Journal of the Korea institute of electronic communication sciences
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    • v.19 no.5
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    • pp.1075-1084
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    • 2024
  • Efforts to expand the installation of devices that assist visually impaired individuals in their mobility are ongoing, but there are significantly fewer devices installed indoors compared to outdoors, causing considerable inconvenience for indoor navigation. Therefore, this paper aims to address these issues by applying the results of machine learning using YOLO(You Only Look Once) to a Raspberry Pi and by researching techniques to reduce errors through the trilateration method of UWB(Ultra-Wideband) sensors, applying it with a Kalman filter. The research results implemented an object recognition algorithm with a comprehensive accuracy of 91.7% using YOLO technology. Based on this object recognition, the direction (left, right, or front) was determined using the distance difference between two ultrasonic sensors set at an angle difference of 15 degrees. A distance of up to 1.5m was accepted through an infrared sensor to output a warning message according to the distance. The distance between the user's tag and the fixed three anchors was measured indoors through a UWB sensor, and the user's location was also measured indoors by linking the distance value with the three-side positioning technique.

Performance Analysis of TPMS Beamformer According to Variance of Antenna Interelement Spacing (안테나 간격 변화에 대한 TPMS 빔형성기 성능분석)

  • Choi, Byung-Sang;Kim, Seong-Min;Hwang, Suk-Seung
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.6
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    • pp.907-915
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    • 2013
  • Tire Pressure Monitoring System (TPMS) is an auxiliary safety system for recognizing the condition of tires based on the pressure and temperature data transmitted from the sensor unit installed on a tire of the vehicle. Using TPMS, a driver can frequently check the state of tires and it aids to maintain the optimum running condition of the vehicle. Since TPMS must utilize the wireless communication technique to transmit data from a sensor unit to a signal processing unit installed in the vehicle, it suffers from interference signals caused by various external electrical or electronic devices. In order to suppress high-power interference signals, we employ beamforming techniques based on the uniform linear antenna array. As the number of the antennas is increased, the performance of the interference suppression is improved. However, there is the limit of the number of antennas, installed in the center of a vehicle, because of its size. In this paper, we compare and analyze the performance of the beamformer, when reducing the interelement spacing of antennas, to increase the number of the receiving antennas. For the performance analysis of the beamformers, we consider the switching beamformer and minimum-variance distortionless-response (MVDR) beamformer for TPMS, recently proposed.

Modified Fold Type Helicone Reflector for Efficient Satellite TT&C Having Variable Coverage Area (가변 커버리지를 갖는 위성 관제용 접이식 헬리콘 반사체 안테나 성능 연구)

  • Lee, Sang-Min;Lee, Woo-Kyung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.9
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    • pp.914-923
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    • 2009
  • Helix antennas have been widely applied to satellite TT&C, data communication and GPS receiver systems onboard military, remote sensing and communication purpose satellites. The helix antennas are known to be convenient to control impedance and radiation coverage characteristics with a maximum directivity in satellite z-axis. Waveguide horn is commonly used for radar system that needs ultra-wideband pulse for exploration ground radar and electromagnetic disability measurement etc. It has high efficiency and low reflection characteristics provided by the low-profile shape and suppressed radiation distortion. In this paper, a waveguide horn structure incorporated with helix antenna design is proposed for satellite applications that require ultra-wideband pulse radar and high rate RF data communication link to ground station over wide coverage area. The main design concern is to synthesize variable beam forming pattern based on modified horn-helix combination helicone structure such that multi-mission antenna is implemented applicable for TT&C, earth observation, high data rate transmission. Waveguide horn helps to reduce the overall antenna structure size by introduction fold type reflector connected to the tapered helix antenna. The next generation KOMPSAT satellite currently under development requires high-performance precision attitude control system. We present an initial design of a hybrid hern-helix antenna structure suitable for efficient RF communication module design of multi-purpose satellite systems.