• Title/Summary/Keyword: Operating system

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mSROS : Real-Time Operating System for Device Controller System in ATM Switching Systems (mSROS : ATM 교환기 장치 제어계를 위한 실시간 운영체제)

  • 김형환;정부금
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.285-288
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    • 1998
  • In this paper, we present mSROS(Micro-Scalable Realtime Operating System) to be applied commonly to the device controller systems in the HANbit ACE256 system. The device controller systems in HANbit ACE256 system are organized as many kinds of device controller. Applying modified PPOS(Peripheral Processor Operating System)which is an operating system for devices of the TDX-10 switching system to the firmwares for them, the inefficiency in development and maintenance exists inherently. To remove the inefficiency nd to improve the performqance of firmwares, we build a common operating system platform that including multi-tasking microkernel so that the firmwares among devices can acquire convenient development and cheap cost of maintencance. Especially, building a virtual machine as a development methodology, it is possible to remove dependency from the kernel so that any kinds of commercial real-time kernels can be used in mSROS as a basic kernel. The virtual machine in mSROS is compatible with the API of SROS(Scalable Realtime Operating System), PPOS, and CROS(Concurrent Realtime Operating System).

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Analysis of a Controllable Queueing Model Operating under the Alternating Operating Policies (변동 운용방침이 적용되는 조정가능한 대기모형 분석)

  • Rhee, Hahn-Kyou
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.39 no.1
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    • pp.81-90
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    • 2016
  • Different from general operating policies to be applied for controllable queueing models, two of three well-known simple N, T and D operating policies are applied alternatingly to the single server controllable queueing models, so called alternating (NT), (ND) and (TD) policies. For example, the alternating (ND) operating policy is defined as the busy period is initiated by the simple N operating policy first, then the next busy period is initiated by the simple D operating policy and repeats the same sequence after that continuously. Because of newly designed operating policies, important system characteristic such as the expected busy and idle periods, the expected busy cycle, the expected number of customers in the system and so on should be redefined. That is, the expected busy and idle periods are redefined as the sum of the corresponding expected busy periods and idle periods initiated by both one of the two simple operating policies and the remaining simple operating policy, respectively. The expected number of customers in the system is represented by the weighted or pooled average of both expected number of customers in the system when the predetermined two simple operating policies are applied in sequence repeatedly. In particular, the expected number of customers in the system could be used to derive the expected waiting time in the queue or system by applying the famous Little's formulas. Most of such system characteristics derived would play important roles to construct the total cost functions per unit time for determination of the optimal operating policies by defining appropriate cost elements to operate the desired queueing systems.

Design and Implementation of the USN kernel with Event-based Preemption (USN 위한 이벤트 중심의 선점형 커널의 디자인과 구현)

  • Han, Sang-Woo;Han, Sang-Eun;Kim, Joong-Heon
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.499-500
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    • 2007
  • The various sensor nodes operating in Ubiquitous Sensor Network environment require the tiny Operating System different from the existing pc-type operating system because of their characteristics. Also Sensor Network operating system needs to support the rapid event handling which sensor node must implement. In this paper, we overcome the drawbacks of the existing sensor network operating system and propose the new kernel which is designed to assist developer to construct event-central operating system entirely. We also evaluate the performance of the super tiny sensor network operating system based on proposed kernel, comparing with that of the existing sensor network operating system.

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Study on the Performance Characteristics of the Solar Hybrid System with Heat Pump Operating Temperature during Winter Season (겨울철 열펌프 작동온도에 따른 태양열 하이브리드 시스템의 성능특성에 관한 연구)

  • Kim, Won-Seok;Cho, Hong-Hyun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.12
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    • pp.821-827
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    • 2010
  • Study on the performance characteristics of the solar hybrid system with heat pump operating temperature during winter season has performed by using an experimental test. The system performance and operating characteristics with the heat pump operating temperature, hour and load condition were investigated and analyzed. As a result, the hot water temperature was significantly affected by the heat pump operating temperature at the morning(time 1) and noon(time 2). However, hot water temperature was set by the radiation quality and collecting operation hour at the afternoon(time 3). In addition to the solar fraction was decreased for the high heat pump operating temperature because the heat pump operated with a long operating time and short operating period.

Embedded Operating System using the Single Address Space(SAS) Architecture (Single Address Space(SAS) Architecture를 이용한 Embedded Operating System)

  • An, Gwang-Hyeok
    • Proceedings of the KIEE Conference
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    • 2003.11c
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    • pp.608-611
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    • 2003
  • A large part of the embedded system, compared with the PC, have low performance CPU and small memory. So the embedded operating system fits the condition of that hardware system. A Single Address Space (SAS) OS has the operating system and all applications in the single address space. The SAS architecture enhances sharing and co-operation, because addresses have a unique interpretation. Thus, pointer-based date structures can be directly communicated and shared between programs at any time, and can be stored directly on storage. The key point of the SAS OS on the embedded system is the low overhead inter-action between programs in process and usage. So SAS OS can be ported on the low performance CPU. In this paper, we design the SAS OS (named emNOS, Embedded Network Operating System) on the ARMTTDMI processor. Finally we show the benefits of the SAS OS on the embedded system.

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Heterogeneous Operating Systems Integrated Trace Method for Real-Time Virtualization Environment (다중 코어 기반의 실시간 가상화 시스템을 위한 이종 운영체제 통합 성능 분석 방법에 관한 연구)

  • Kyong, Joohyun;Han, In-Kyu;Lim, Sung-Soo
    • IEMEK Journal of Embedded Systems and Applications
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    • v.10 no.4
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    • pp.233-239
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    • 2015
  • This paper describes a method that is integrated trace for real-time virtualization environment. This method has solved the problem that the performance trace may not be able to analyze integrated method between heterogeneous operating systems which is consists of real-time operating systems and general-purpose operating system. In order to solve this problem, we have attempted to reuse the performance analysis function in general-purpose operating system, thereby real-time operating systems can be analyzed along with general-operating system. Furthermore, we have implemented a prototype based on ARM Cortex-A15 dual-core processor. By using this integrated trace method, real-time system developers can be improved productivity and reliability of results on real-time virtualization environment.

The Improved Device of Seoul Subway Fare System (서울 지하철의 운임제도 개선방안)

  • Lee, Tai-Sik;Jun, Young-Joon;Kwon, Ou-Chul;Chung, Jong-Ky;Lee, Dong-Wook
    • Journal of the Korean Society for Railway
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    • v.9 no.2 s.33
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    • pp.200-205
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    • 2006
  • Subway widely used as a major mean of public transportation both at home and abroad contributes to ease chronic traffic congestion in cities. However, subway operating expense is expected to increase continuously because subway requires vast amount of money at the construction stage, huge sum of maintenance cost is spent during operation, and passenger needs for more convenient facilities is increasing. on the contrary to enormous operating expenses, fare that is occupying most of operating income doesn't come up to its prime cost causing chronic operating deficit. It is urgent to prepare fare system improvement measures to increase operating income in order to resolve financial difficulty of a subway operating organization. Therefore, the current study analyzed present condition and problems of subway fare system, and suggested improvement measures such as improvement of fare adjustment procedure, improvement of free-ride system, diversification of ticket, etc.

Establishment of a secure networking between Secure OSs

  • Lim, Jae-Deok;Yu, Joon-Suk;Kim, Jeong-Nyeo
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2097-2100
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    • 2003
  • Many studies have been done on secure operating system using secure kernel that has various access control policies for system security. Secure kernel can protect user or system data from unauthorized and/or illegal accesses by applying various access control policies like DAC(Discretionary Access Control), MAC(Mandatory Access Control), RBAC(Role Based Access Control), and so on. But, even if secure operating system is running under various access control policies, network traffic among these secure operating systems can be captured and exposed easily by network monitoring tools like packet sniffer if there is no protection policy for network traffic among secure operating systems. For this reason, protection for data within network traffic is as important as protection for data within local system. In this paper, we propose a secure operating system trusted channel, SOSTC, as a prototype of a simple secure network protocol that can protect network traffic among secure operating systems and can transfer security information of the subject. It is significant that SOSTC can be used to extend a security range of secure operating system to the network environment.

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Evaluating Unity3D Optimization Ways for Mobile Operating System Tizen (모바일 운영체제 Tizen에 대한 Unity 최적화 방안 평가)

  • Kim, Young-Jae;Lee, Sang-Ho
    • Journal of Convergence for Information Technology
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    • v.7 no.6
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    • pp.187-192
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    • 2017
  • The Android operating system currently has a proven method of Unity optimization. However, the Tizen operating system does not know how effective the existing Unity optimization method can be applied to the Tizen operating system and how effective it is. In this paper, we analyze the efficiency of applying Unity optimizing techniques of Android operating system to Tizen operating system. To get this purpose, this study investigates whether the existing Unity optimization method can be applied to Tizen operating system and evaluates the efficiency of the method through Unity Profiler. This research will allow us to further evaluate the Unity optimizations for the existing Android operating system in the future.

Life Cycle Costing through Operating Number Control of Air Conditioning Systems in Office Buildings (사무소 건축물의 공조시스템 대수제어 여부에 따른 LCC 분석)

  • Park, Ryul;Jung, Soon-Sung
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.11
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    • pp.981-988
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    • 2002
  • Generally, the term "energy saving is economical" is appropriate for the national view point and for design and assessment of one system, but not appropriate when choosing the system by comparing alternative systems in the early design step. Sometimes, non-energy saving system is more economical than energy saving system because of the price of electricity, gas or oil, which are used for operating the air conditioning system. Therefore, when designing the system, we should consider the efficient alternatives through economic assessment of energy saving method. However, research on non-operating number control of the system is not sufficient because it is more common to use operating number control of the system for most economic assessment of air conditioning system. For this reason, this research can provide the economics through operating number control as basic design data. The data obtained through assesment of Life Cycle Cost based on amount of yearly energy use, were produced by system simulation of HASP/ACLD/8501 and HASP/ACSS/8502 for six alternative heating/cooling systems based on constant air volume conditioning system, which is widely used for medium and large office buildings in Busan.