• The KIPS Transactions:PartA
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• v.11A no.7 s.91
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• pp.483-488
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• 2004

For real-time applications, the underlying operating system (0S) should support timeliness guarantees of real-time tasks. However, most of current operating systems do not provide timely management facilities in an efficient way. There could be two approaches to support timely management facilities for real-time applications: (1) by modifying 0S kernel and (2) by Providing a middleware without modifying 0S. In our approach, we adopted the middleware approach based on the TMO (Time-triggerred Message-triggered Object) model which is a well-known real-tine object model. The middleware, named TMSOM (TMO Support Middleware) has been implemented on various OSes such as Linux and Windows XP/NT/98. In this paper, we mainly consider TMOSM implemented on Linux(TMOS/Linux). Although the real-time schedul-ing aIgorithm used in current TMOSM/Linux can produce an efficient real-time schedule, it can be improved for periodic real-time tasks by considering several factors. In this paper, we discuss those factors and propose an improved real-time scheduling algorithm for periodic real-time tasks, In order to simulate the performance of our algorithm, we measure timeliness guarantee rate for periodic real-time tasks. The result shows that the performance of our algorithm is superior to that of existing algorithm. Additionally, the proposed algorithm can improve system performance by making the structure of real-time middleware simpler.

• The Transactions of the Korea Information Processing Society
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• v.5 no.12
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• pp.3047-3062
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• 1998

This paper deseribes the desihn and the implementation of the Realtime Transport Protocol(RTP)/ Rdaltime Control Protocol(RTCP) (RFC 1889,1890) that is used to transmit the audio/video data to any destination and to feedback the Quality of Service (QoS) information of the received media data to the sender, in the teleconferencing systems proposed by ITU-T. These protocols are implemented with multi thead technique and run on top of UDP/IP-Multicast through the socket interface as the underlying protocol. The upper layer is impelmented such that in can be accessed by the H245 comference control protocol. The RTP packetizes the digitized audio/video data from the encoder info a fixed format, and multieast to the participants. The RTCP monitors RTP packets and extracts the QoS values from it such as round-trip delay, jiter and packet loss to form RTCP packets and non periokically sends them to the sender site. In this Paper, we also descritx the study of measurement and analysis for QoS factors that observed on performing teleconferencing system over Internet. The results from this experiment is indicate that RTT and Jitter value are acceptable even entwork load is high. However, it appears that packet loss rate is high in daytime and most losses periods have length one or two.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.36 no.4
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• pp.1-18
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• 2023

Objectives : This study retrospectively analyzed the medical records of patients admitted to Korean medicine ophthalmology, otolaryngology and dermatology department of Daejeon Korean medicine hospital from March 2018 to February 2023 to analyze the characteristics of patients receiving inpatient treatment. Methods : We retrospectively analyzed inpatients who admitted to ophthalmology & otolaryngology & dermatology clinic of Daejeon Korean medicine hospital from March 1st, 2018 to February 28th, 2023, according to gender, age, year, season, detailed subdivision. The statistical analysis performed using IBM SPSS 29.0 for Windows. Results : 1. Examining the gender distribution of the patient group, there were 367 female patients, accounting for 71.7% of the total patients, and 145 male patients, accounting for 28.3% of the total patients. 2. When analyzing inpatients by subdivision, otology accounted for more than half of the total number of inpatients, and the combined number of otology and dermatology accounted for more than 80% of the total. 3. As a result of analyzing inpatients by frequent disease, Sudden hearing loss was a significantly higher number of patients, accounting for 22.7% of all inpatients. Conclusions : It was found that the proportion of patients with otologic diseases was very prominent. It is thought that further research is needed to see if the trend of increasing demand for otologic diseases continues.