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서울의 대기오염이 소아 천식 환자들의 외래 방문 빈도에 미치는 영향
송호인 대한알레르기학회 2001 천식 및 알레르기 Vol.21 No.1
Background : Despite the evident age differences in the risk of asthma attack due to air pollution, most studies have recruited subjects from all age groups. Although this effort might be feasible for maintaining statistical power, it biases the effect estimate towards the null among children who are more sensitive to air pollution than adults. Objectives : To estimate the risk of air pollution on children living in Seoul who have made doctor visits for asthma. Method : From 1992 to 1993, daily number of doctor visits due to asthma attack was tallied among children between 4 and 11 years old living in Seoul from the insurance claim forms of Korean Medical Insurance Corporation (KMIC). 24-hour mean concentrations were calculated for TSP, SO₂, O₃ and NO₂ based on hourly concentrations measured at 20 monitoring stations. To estimate the effect of TSP or SO₂ on asthma attack, a Poisson regression model was used with adjustments for long-term trend, seasonal variation, day-of-week effect, and meteorological factors such as temperature, humidity, wind velocity and duration of sunshine. To prevent autocorrelation, autoregressive error terms were tried with different lag periods. Results : The cumulative effect of a current day and previous five days turned out to be stronger than that of any single day. These relationships were observed more clearly after the effects of O₃ and NO₂ were controlled. For 100㎍/m³ increase of cumulative concentration of TSP, the relative risk was 1.27 (95% CI: 1.08, 1.49); for 50ppb increase of cumulative concentration of SO₂, the relative risk was 1.56 (95% CI: 1.29, 1.89). After the effects of O₃ and NO₂ were removed in a multiple regression model, it increased to 1.37 (95% CI: 1.10, 1.69) and 1.66 ((%% CI: 1.34, 2.07), respectively. Conclusion : The concentrations of TSP and SO₂ turned out to be significantly associated with asthma attack among children. As expected, the risk estimates were larger than those of previous studies which recruited subjects from all age groups, or used motality or hospitalization as their outcome.
CAN 기반 분산 제어를 위한 시스템 구성 및 ATV 모델링의 실험적 검증
송호인(Hoin Song),백운혁(Woonhyuk Baek),김순태(Soontae Kim),장세용(Seyong Jang),송봉섭(Bongsob Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper presents the development of a CAN-based distributed control system and hierarchical software architecture for longitudinal control of ATV. Moreover, as a prerequisite to develop a longitudinal controller, the longitudinal control model of ATV is validated experimentally using the proposed distributed system. In order to develop an autonomous ATV as an ultimate goal, the distributed control system and its software architecture with modularity is more efficient than a centralized control system with respect to real-time computation, debugging, and add/modification of functions. In this paper, angle of DC motors for throttle and brake control, angular velocity of engine and wheel, and data of GPS/IMU are measured and processed via the distributed DSPs, and communicated among them through CAN. Finally, the proposed longitudinal control model of ATV is validated with the experimental data.
김순태,송호인,송봉섭 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.4
This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However, its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method is validated experimentally via field tests of an ATV. This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However, its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method is validated experimentally via field tests of an ATV.
하도준,김병수,김인근,송호인,이영재,Ha, Do-Jun,Kim, Byoung-Soo,Kim, In-Keun,Song, Ho-In,Lee, Young-Jae 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
This paper presents a study on characteristics of precession motion of a smart munition. It's a kind of the Sensor Fuzed Weapon. The particular thing for the smart munition is that it has precession motion in the air while the sensor is searching the ground to detect ground vehicles such as tanks. The smart munition has a cylindrical shape and has a sensor attached on its side. Due to its non-uniform mass distribution, its center of gravity(CG) is located away from the center of volume(CV). In order for the smart munition to detect the target effectively, the ground searching pattern of sensor should have an uniform circular form, and for this, the precession motion of smart munition should be in its steady-state. Finally, it is necessary to choose the right initial conditions at the moment of firing, for the steady-state precession motion during flight.