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저온유통물류의 실시간 모니터링을 위한 IoT 하드웨어 시스템의 설계분석에 관한 연구
박화세(Hwase Park),고대식(Dae-Sik Ko) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.3
Recently there have been attempts to combine IT such as ICBM to products in order to make the cold chain system and service intelligent. This paper designs a novel cold chain monitoring hardware system using Internet of things (IoT) that support full supply chain management and real-time control services of fresh food, medicine, and temperature sensitive products. In order to do this, we have comparatively analyzed how to implement the hardware of the cold chain system and transfer the collected sensor data. In the transmission method used for the cold chain hardware monitoring system we used Bluetooth, ZigBee, RFID, PLC (Power Line Communication) and LPWA (Low Power Wide Area). These will be applied according to use on the full supply chain.
박화세(Hwase Park),고대식(Daesik Ko) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 ICS 시스템의 성능 개선을 위하여 개선된 적응 LMS 알고리즘을 연구하였다. ICS 중계기의 수신 신호는 수신신호와 궤환 신호로 구성된다. 이 경우, 만약 입력되는 궤환 신호를 제거하지 못하면 시스템이 발진하게 된다. 본 논문에서는 이러한 궤환된 신호를 효율적으로 제거하기 위하여 IF 신호와 개선된 적응 LMS 알고리즘을 적용하였다. In this paper, we studied improved adaptive LMS algorithm for the performance enhancement of ICS repeater. The received signal of ICS repeater is composed of BS (Base Station) and feedback signals. In this case, if the feedback signals are not rejected, system is oscillated. We used the IF signal and adaptive LMS algorithm for rejecting the feedback signal at ICS system.
박화세(Hwase Park),고대식(Daesik Ko),박정일(JungIl Park) 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-
본 논문에서는 항공기의 방위각을 알려주는 VOR 신호를 수신하는 시스템의 IF 시스템을 설계하였다. 과거에 아날로그 방식으로 수신된 신호를 하드웨어적으로 복조하여 두신호의 위상차를 비교하여 현재의 방위각을 계산하는 시스템을 DSP 및 FPGA를 이용하여 수신 신호를 복조하는 디지털 방식의 VOR 수신기 시스템을 설계하였다. 디지털 방식으로 수신기를 설계 하는 경우 기존의 아날로그 수신기 보다 수신 신호의 감도가 좋아져 방위각의 오차를 최소화 할 수 있다.
적응형 스텝 크기를 갖는 Sign-LMS 알고리즘을 이용한 Interference Cancellation System
박화세(Hwase Park),고대식(Daesik Ko),박정일(JungIl Park) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 ICS 시스템의 성능 개선을 위하여 개선된 적응 sign-LMS 알고리즘을 연구하였다. ICS 중계기의 수신 신호는 수신신호와 궤환 신호로 구성된다. 이 경우, 만약 입력되는 궤환 신호를 제거하지 못하면 시스템이 발진하게 된다. 본 논문에서는 이러한 궤환된 신호를 효율적으로 제거하기 위하여 sign-LMS 알고리즘을 적용하였다. In this paper, we studied improved adaptive sign-LMS algorithm for the performance enhancement of ICS repeater. The received signal of ICS repeater is composed of Base Station and feedback signals. In this case, if the feedback signals are not rejected, system is oscillated. We used the IF signal and adaptive sign-LMS algorithm for more fast rejecting the feedback signal at ICS system.
LMS 알고리즘을 이용한 ICS중계기의 성능개선에 관한 연구
박화세(Hwase Park),고대식(Daesik Ko) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.3
In this paper, we studied improved adaptive LMS algorithm for the performance enhancement of ICS repeater. The received signal of ICS repeater is composed of BS (Base Station) and feedback signals. In this case, if the feedback signals are not rejected, system is oscillated. We used the IF signal and adaptive LMS algorithm for rejecting the feedback signal at ICS system. In simulation results, we knew that the improved adaptive LMS algorithm is used for rejecting of feedback interference signals, using DSP between donor and service antenna, and automatic interference feedback system of ICS repeater.
적응형 스텝 크기를 갖는 Sign-LMS 알고리즘을 이용한 궤환 간섭 신호 제거 장치
박화세(Hwase Park),고대식(Daesik Ko),박정일(JungIl Park) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.1
Typically, the output signal of the RF repeater is feedback to the inputs. The feedback signal is amplified by the repeater and the amplified output signal that causes interference. These interference signals make the output signal of the oscillation. In addition, the input will vary the power of the feedback signals affect the system to stabilize, depend on the antenna distance. In this paper, In this paper, the performance of these RF repeaters to improve when the sign-LMS adaptive algorithm applied, using this algorithm the system was designed, and the ICS repeater's hardware performance and taking into account the distance between the antenna were simulated. Simulations based on received power and antenna Separated could see the change.
김현(Hyun Kim),우종우(JongWoo Woo),박화세(HwaSe Park) 한국정보기술학회 2006 한국정보기술학회논문지 Vol.4 No.2
In this study, we have been constructed measuring system for interference for TV broadcasting signals between Korea and Japan. In Busan, we have been measured 14 channel of Japan TV broadcasting signals during 4 days. The quality of image is that 2.5 level is maximum grade, and the quality of sound is that 3 level is maximum grade. And we have been observed Japan TV broadcasting signals, in Busan, Ulsan, and Pohang. There are detected 40 channels. The 19, 24, 29, 36, 39 channels have 3.0 grade image quality and The maximum field strength is 71㏈㎶/m.
강안나(Kang Anna),고대식(Ko DaeSik),김찬회(Kim ChanHoe),박화세(Park Hwase) 한국정보기술학회 2006 한국정보기술학회논문지 Vol.4 No.5
In this paper, network performance according to network design of the IPS has been studied and analyzed. Network security zone according to design scenarios of the IPS have been analyzed. In studied results, it has been shown that IPS is deployed at ingress/egress points(between firewall and core switch) Access layer trunks to protect internal segments. and internet DMZ ingress/egress point. We can define security zone by using IPS placement.