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Byungjoo Park,Dongchul Lee 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10
Current mobile networking technology is continuously progressing to support the demand of today’s generation of Internet users who connect about with sophisticated mobile computers and digital wireless devices. Routing protocols needs to be modified in host mobility in order that packets will be sent and delivered in its right destination. In Mobile Internet protocol, the mobile node will be able to send and receive packet from its original Home IP address to its current location regardless of the location upon connection with Internet. Through this kind of connection, packet loss is inevitable during the handover process. To solve this, numerous studies on the handover process was studied in order to minimize packet loss during the handover process. In this paper, we suggest context aware based smart distributed packet (SDP) transmission mechanism using multi-access routing switching mechanism in wireless integrated networks. We will explain and discuss the scheme that supports a distributed fast handover effectively in mobile management protocol based context-awareness. New signaling messages, smart distributed packet update messages, advanced TFRC message and reverse PBUs, are defined and utilized to hasten the handover procedure.
The effects of ruthenium-oxidation states on Ru dissolution in PtRu thin-film electrodes
Park, Yejun,Lee, Byungjoo,Kim, Chunjoong,Oh, Yuhong,Nam, Seunghoon,Park, Byungwoo Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.9
<P>The effects of ruthenium (Ru)-oxidation states were investigated on Ru dissolution from PtRu thin-film electrodes, with the 200 cycles between 0.4 and 1.05 V (versus normal hydrogen electrode). The Ru-oxidation states of the PtRu thin films were systematically modified by an anodic (oxidation) treatment. The anodic-treated PtRu electrodes, whose methanol-oxidation activity was similar to untreated electrodes before the 200 cycles, showed a remarkable decrease in methanol oxidation after the cycles, because of the Ru dissolution from the PtRu surface. The results suggest that the Ru-oxide species are the origin of Ru dissolution in the PtRu alloy.</P>
Effects of iron-phosphate coating on Ru dissolution in the PtRu thin-film electrodes
Park, Yejun,Lee, Byungjoo,Kim, Chunjoong,Kim, Jongmin,Park, Byungwoo Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.1
<P>The effects of FePO4 nanoscale coating on PtRu thin films were investigated on the block of Ru crossover. Ru dissolution was examined by the accelerated-potential cycles between 0.4 and 1.05 V. The results showed that Ru dissolution from FePO4-coated PtRu surface was inevitable due to the direct contact between the PtRu surface and aqueous electrolyte. However, the FePO4 coating layer on PtRu thin-film electrodes effectively retained the dissolved Ru species, thus preventing the dissolved Ru species from diffusing into the electrolyte. Moreover, the retained Ru species within the FePO4-coating layer were redeposited onto the PtRu surface during the cycling in the fresh electrolyte.</P>
Park, Byungjoo The Institute of Internet 2018 Journal of Advanced Smart Convergence Vol.7 No.4
The efficiency and safety of social-overhead capital (SOC) public infrastructures have become an eminent social concern. In this regard, a continuous structural health monitoring has been widely implemented to oversee the robustness of such public infrastructures for the safety of the public. This paper deals with the analysis of a distributed mobility management (DMM) support for wireless sensor network (WSN) based information transmission system. The partial DMM support separates the data and control plane infrastructures, wherein, the control plane is managed by a particular mobility management network entity, while the data plane is distributed by the mobility anchors. The system will be able to optimize the information transmission for a wireless structural health monitoring of SOC public infrastructures specifically designed for bridges, and thus, guarantees the safety of public commuters.
Byungjoo Park 한국인터넷방송통신학회 2018 Journal of Advanced Smart Convergence Vol.7 No.4
The efficiency and safety of social-overhead capital (SOC) public infrastructures have become an eminent social concern. In this regard, a continuous structural health monitoring has been widely implemented to oversee the robustness of such public infrastructures for the safety of the public. This paper deals with the analysis of a distributed mobility management (DMM) support for wireless sensor network (WSN) based information transmission system. The partial DMM support separates the data and control plane infrastructures, wherein, the control plane is managed by a particular mobility management network entity, while the data plane is distributed by the mobility anchors. The system will be able to optimize the information transmission for a wireless structural health monitoring of SOC public infrastructures specifically designed for bridges, and thus, guarantees the safety of public commuters.
Failure prediction of a motor-driven gearbox in a pulverizer under external noise and disturbance
Park, Jungho,Jeon, Byungjoo,Park, Jongmin,Cui, Jinshi,Kim, Myungyon,Youn, Byeng D. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.2
Participants in the Asia Pacific Conference of the Prognostics and Health Management Society 2017 (PHMAP 2017) Data Challenge were given measured vibration signals from motor-driven gearboxes used in pulverizers. Using this information, participants were requested to predict failure dates and the faulty components. The measured signals were affected by significant noise and disturbance, as the pulverizers in the provided data worked under actual operating conditions. This paper thus presents a fault prediction method for a motor-driven gearbox in a pulverizer system that can perform under external noise and disturbance conditions. First, two fault features, an RMS value in the higher frequency zones (HRMS) and an amplitude of a period for high-speed shaft in the quefrency domain ($QA_{HSS}$), were extracted based on frequency analysis using the higher and lower sampling rate data. The two features were then applied to each pulverizer based on results of frequency responses to impact loadings. Then, a regression analysis was used to predict the failure date using the two extracted features. A weighted regression analysis was used to compensate for the imbalance of the features in the given period. In addition, the faulty components in the motor-driven gearboxes were predicted based on the modulated frequency components. The score predicted by the proposed approach was ranked first in the PHMAP 2017 Data Challenge.
A Wireless Intraocular Pressure Sensor with Variable Inductance Using a Ferrite Material
Byungjoo Kang,Hoyong Hwang,Soo Hyun Lee,Ji Yoon Kang,Joung-Hu Park,Chulhum Seo,Changkun Park 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.4
A wireless intraocular (IOP) pressure sensor based on micro electro mechanical system (MEMS) technology is proposed. The proposed IOP sensor uses variable inductance according to the external pressure. The proposed sensor is composed of two flexible membranes: a ferrite bottom part, an inductor, and a capacitor. The inductance of the sensor varies according to the external pressure. The resonance frequency of the sensor is also varied, and this frequency is detected using an external coil. The external coil is designed with an FR-4 printed circuit board. The feasibility of the proposed sensor structure using variable inductance to detect the external pressure is successfully demonstrated.
Seamless Mobility Management in IP-based Wireless/Mobile Networks with Fast Handover
( Byungjoo Park ),( Eunsang Hwang ),( Gil-cheol Park ) 한국인터넷정보학회 2009 KSII Transactions on Internet and Information Syst Vol.3 No.3
The challenges of rapidly growing numbers of mobile nodes in IPv6-based networks are being faced by mobile computing researchers worldwide. Recently, IETF has standardized Mobile IPv6 and Fast Handover for Mobile IPv6 (FMIPv6) for supporting IPv6 mobility. Even though existing literatures have asserted that FMIPv6 generally improves MIPv6 in terms of handover speed, they did not carefully consider the details of the whole handover procedures. Therefore, in conventional protocols, the handover process reveals numerous problems manifested by a time-consuming network layer based movement detection and latency in configuring a new care of address with confirmation. In this article, we study the impact of the address configuration and confirmation procedure on the IP handover latency. To mitigate such effects, we propose a new scheme which can reduce the latency taken by the movement detection, address configuration and confirmation from the whole handover latency. Furthermore, a mathematical analysis is provided to show the benefits of our scheme. In the analysis, various parameters are used to compare our scheme with the current procedures, while our approach is focused on the reduction of handover latency. Finally, we demonstrate total handover scenarios for the proposed techniques and discussed the major factors which contribute to the handover latency.