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EtherCAT Cycle Time의 성능 분석 및 향상에 관한 연구
이범용 ( Bum-yong Lee ),박재현 ( Jaehyun Park ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
기존 필드버스의 낮은 트래픽 전송률로 인하여 IEEE 802.3 이더넷이 필드버스의 대안으로 제시되었다. 하지만, 이더넷은 CSMA/CD 메카니즘을 사용하기 때문에 실시간 성이 떨어진다는 단점이 있다. 이러한 단점을 개선하기 위하여 EtherCAT 이 개발되었다. 본 논문에서는 EtherCAT의 Cycle Time 성능을 분석하고 개선하기 위하여 M-EtherCAT 을 제안한다. M-EtherCAT 은 EtherCAT 과 달리 각 Telegram이 Slave를 거치지 않기 때문에 EtherCAT 보다 Cycle Time의 최소 주기를 더 줄일 수 있다.
이범용(Lee Bum-Yong),김형인(Kim Hyung-In),정성윤(Jung Sung-Youn),박재현(Park Jaehyun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Real-time communication network is important for KTX high speed train system because small problem can make a huge accident. Communication network for KTX high speed train system consists of IEEE 802.4 token bus network and FM0 encoding. The network device is developed by using MC68824 TBC, MC68185 TPM and MC68020 MPU. The network device make available to analysis of the network protocol among vehicles for Kyung-Boo high-speed train system.
IEC 61850 프로토콜의 실시간성 향상을 위한 선점형 이더넷 컨트롤러
이범용(Bum Yong Lee),박태림(Tae Rim Park),박재현(Jaehyun Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.10
The IEC 61850 protocol proposed for the interoperability between IEDs(intelligent electronic devices) adopts the prioritized switched ethernet as its communication channel because substation bus is utilized to exchange both real-time and non real-time messages. The prioritized switched ethernet uses IEEE 802.1Q/p QoS(Quality of Service) in addition to IEEE 802.3 ethernet to enhance the real-time characteristics. However, IEEE 802.1Q/p QoS has priority-blocking problem that occurs when higher-priority frame transmission request during lower-priority frame transmission. To resolve this problem, this paper proposes P(Preemptive)-Ethernet. P-Ethernet uses the modified IEEE 802.1Q/p frame format and new priority preemption mechanism. This paper also implements P-Ethernet controller using FPGA (Virtex-4) and MicroBlaze processor. From the implementation results, P-Ethernet controller shows a improved latency and jitter of transmission period compare to the normal ethernet controller.
유계준,이만홍,이범용 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.1
As a part of Kangwha Mental Health project, a psychiatric epidemiologic survery was conducted in 1985 using the Korean version of NIMH-Diagnostic Interview Schedule III A. The authors reanalyzed the data so that the prevalence rates of depression and somatization disorder and frequencies of depression and somatization symptoms were compared among alcohol dependence, alcohol abuse and non-alcoholic males. The results were as follows; 1) Although there were no significant differences in the prevalence rates of major depression dysthymic disorder, and somatization disorder among male alcohol abuse, alcohol dependence and non-alcoholic group, the prevalence rates were slightly higher in both alcohol use disorder groups compared to non-alcoholic group. 2) Frequencies of depression symptoms such as depressive mood more than 2 weeks, insomnia and slowed thinking were significantly higher in both alcohol abuse and alcohol dependence group compared to non-alcoholic group, but frequencies of symptoms such as depressive mood more than 2 years, recurrent thoughts of death, wishes to be dead, suicidal ideation and suicidal attempt were significantly higher in alcohol dependence group compared to both alcohol abuse and non-alcoholic group. 3) In alcohol dependence group, the frequencies of somatization symptoms such as vomiting spells, blurred vision, deafness, trouble walking, paralysis or musle veakness, palpitation, weakness difficulty swallwing and inability to work were significantly higher compared to non-alcoholic group, and frequencies of symptoms such as abdominal pain, loss of voice and anesthesia on extrimities were significantly higher compared to non-alcoholic group as well as alcohol abuse group. 4) Mean score of somatization symptoms were significantly higher in alcohol dependence group compared to alcohol abuse and non-alcoholic group, but that of depression symptoms were significantly higher in both alcohol abuse and alcohol dependence groups compared to non-alcoholic group.
서영수,이범용 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
When the vector control, which does not need a speed signal from a mechanical speed sensor it is possible to reduce the cost of the control equipment and the control performance in many industrial application. This paper describes rotor speed identification method of induction motor based on the theory of flus model reference adaptive system. The estimator execute the rotor speed identification so that the vector control of the induction motor may be achieved. The improved auxiliary variable of the two model are introduced to perform accurate speed estimation.
서영수,이범용 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-
When the vector control, which does not need a speed signal from a mechanical speed sensor, it is possible to reduce the cost of the control equipment and to improve the control performance in many industrial application. This paper describes a rotor speed identification method of induction motor based on the theory of flux model reference adaptive system. The estimator execute the rotor speed identification so that the vector control of the induction motor may be achieved. The improved auxiliary variable of the two model are introduced to perform accurate rotor speed estimation.
이만홍,이범용 中央醫學社 1992 中央醫學 Vol.57 No.12
The authors conducted a open-trial clinical study to evaluate the efficacy of sertraline, a new selective serotonin reuptake inhibitor, with 30 patients with either DSM-III-k diagnosis of major depression or dysthymic disorder and the results were as follows. 1. Symptoms of depression meassured by Clinical Global Assessment Scales, Hospital Anxiety and Depression Scale improved statistically very significantly with 6 weeks of medication. 2. Somatic symptoms complained by patients also improved with 6 weeks of medication. 3. Sertraline showed very little side effects and all of the patients tolerated very well during the six weeks of study period.
정신분열증, 분열형장애 및 망상장애 : DCR-10의 현지조사(1)
오병훈,이범용,이주훈 大韓神經精神醫學會 1992 신경정신의학 Vol.31 No.2
An interrater reliabilty test for schizophrenia spectrum disorders of DCR-10 1990 draft was conducted along with subjective ratings of confidence and easy or difficulty of diagnostic process, and this is a part of WHO Held trial of DCR-10-1990 draft. The results of this study were as follows : 1) Subjective ratings of confidence and easy or difficulty of diagnostic process for main diagnoses were rated above moderate. 2) Kappa coefficients for interrater reliability was 0.62 for schizophrenia spectrum disorders. Kappa coefficient for schizophrenia and acute or transient psychotic disorder was 0.54 and 0.70 respectively. But that for schizotypal disorder, schizoaffective disorder and delusional disorder was below 0.31.