• 한국융합학회논문지
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• 제9권3호
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• pp.39-44
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• 2018

논문은 E-Mobility용 전력변환기의 고장 진단을 위해 차량 상태의 모니터링 기술을 IoT 기술을 접목하여 스마트폰으로 연동하여 운용하는 것에 대한 것이다. 중국에서는 EV 규제를 실시하여 기술의 발전과 전기자동차에 대한 시장 변화를 유도하고 있다. 이러한 추세에 맞게 E-Mobility도 적합한 모니터링 기술을 연구해야 한다. 기존 자동차에서 적용하는 OBD-II를 이용한 방법은 유무선 통신 방법이다. E-Mobility에 적용하기 위해서는 추가의 인터페이스 및 통신연동이 필요하다. 본 논문에서는 기존 기술과 IoT를 접목시켜 E-Mobility용 전력변환기의 상태정보를 모니터링 하는 기술을 제안하였다. 이 기술을 통해서 기존 네트워크 프로토콜 및 하드웨어 인터페이스를 간소화 하였고, 사용자가 쉽게 모니터링 할 수 있도록 E-Mobility용 전력변환기와 스마트폰의 연동이 가능함을 확인하였다. 그리고 기능 측면에서 고부가가치 제품 설계가 되도록 연구를 수행하였다.

• Journal of information and communication convergence engineering
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• 제14권3호
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• pp.137-146
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• 2016

In this paper, we introduce a quality of experience (QoE)-provisioning mobility management scheme. The emphasis is on a mobility-aware QoE solution enabling network components to recognize the mobility pattern of an end-user and to prepare a handover in advance. We further focus on an energy-adaptive QoE solution based on the energy profile providing the preferred pattern of energy consumption and an energy preference check engine determining whether the provision of the service that the end-user requested is suitable to QoE or not. Lastly, we concentrate on a network-based intelligent mobility management scheme adopting the calm service and the balance. Consequently, we conclude that the proposed schemes improve the handover latency, QoE metrics, and energy efficiency simultaneously.

• 한국산업융합학회 논문집
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• 제24권6_2호
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• pp.919-926
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• 2021

In this paper, a study was conducted on the miniaturization of an e-Mobility battery charger module using GaN-FET. GaN-FET is one of the types of WBG devices, and it is a device that exceeds the performance of existing Si power semiconductors. In particular, GaN-FET has the advantage of small packaging size and high switching frequency operation, which is advantageous for miniaturization of power converters. Therefore, a bidirectional DC/DC converter module for e-mobility charging using GaN-FET was developed. To apply to the converter to be developed, analysis is performed on the characteristics of GaN-FET, and after manufacturing a prototype of a bidirectional DC/DC converter module, the efficiency and temperature data of the power converter are analyzed to verify its feasibility.

• 복식
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• 제65권3호
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• pp.28-46
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• 2015

The aim of this research is to classify the concept expressed in the mobility of la diff${\acute{e}}$rant play, and supplement logic, which is process of the changeability of fashion style. The specific research questions are as follows: first question deals with the relationship between changeability and la diff${\acute{e}}$rant images, and how la diff${\acute{e}}$rant images are divided by each phase and how their circumduction play is proceeded. The second question is about the important features of the mobility of la diff${\acute{e}}$rant play and the method of la diff${\acute{e}}$rance play. The last topic of this study covers the supplement logic and the condition, and how supplement logic has been applied in the process of changeability of fashion style. This paper deploys a qualitative research method providing a systematic review of the previous studies. To sum it up, the mobility of la diff${\acute{e}}$rant play is the root of power, which is controlling the changeability of fashion style, and the objective of the play is to outline new la diff${\acute{e}}$rant images through spatialization of time. In addition, supplement logicis the method of la diff${\acute{e}}$rant play and the purpose of the logic is to harmonize 'ultimate la diff${\acute{e}}$rant image', which is the phenomenological construction stratum in the state of sub-conscious changeability, and 'immediate la diff${\acute{e}}$rant image', which is the structural construction level stratum in the state of external changeability. This research proves that the intrinsic attribute of changeability is contained the mobility of la diff${\acute{e}}$rant play and supplement logic.

• Nuclear Engineering and Technology
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• 제51권3호
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• pp.731-737
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• 2019

In this study, a new measurement method based on voltage transients in CdZnTe detectors response to low energy photon irradiations is applied to measure the electron mobility (${\mu}_e$) and electron mobility-lifetime product $({\mu}{\tau})_e$ in a CdZnTe detector. In the proposed method, the pulse rise times are derived from low energy photon response to 59.5 keV($^{241}Am$), 88 keV($^{109}Cd$) and 122 keV($^{57}Co$) ${\gamma}-rays$ for the irradiation of the cathode surface at each detector for different bias voltages. The electron $({\mu}{\tau})_e$ product was then determined by measuring the variation in the photopeak amplitude as a function of bias voltage at a given photon energy using a pulse-height analyzer. The $({\mu}{\tau})_e$ values were found to be $(9.6{\pm}1.4){\times}10^{-3}cm^2V^{-1}$ for $1000mm^3$, $(8.4{\pm}1.6){\times}10^{-3}cm^2V^{-1}$ for $1687.5mm^3$ and $(7.6{\pm}1.1){\times}10^{-3}cm^2V^{-1}$ for $2250mm^3$ CdZnTe detectors. Those results were then compared with the literature $({\mu}{\tau})_e$ values for CdZnTe detectors. The present results indicate that, the electron mobility ${\mu}_e$ and electron $({\mu}{\tau})_e$ values in CdZnTe detectors can be measured easily by applying voltage transients response to low energy photons, utilizing a fast signal acquisition and data reduction and evaluation.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.870-873
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• 2001

The electron drift mobilitity of poly(4,4'-cyclohexylidenediphenyl carbonate)(PC-Z) doped with 3,5-dimethyl-3',5'-di-t-butylstilbenequinone(MBSQ) was measured by the time-of-flight technique. Energy gap of the polymer doped with 25wt% of MBSQ was 3.1 eV. The electron drift mobility was 2.98${\times}$10$\^$-6/$\textrm{cm}^2$/V$.$s at 293K. The electric field and temperature dependences of the electron drift mobility were discussed with Poole-Frenkel and Arrhenius formulations. The activation energy(E$\_$0/), Poole-Frenkel coefficient(${\beta}$) and effective temperature(T$\_$eff/) of the mobility are 0.815 eV, 1.73${\times}$10$\_$-4/ eV$.$cm$\^$1/2//V$\_$1/2/ and 6.43${\times}$10$^2$K, respectively.

• Journal of Information Processing Systems
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• 제4권4호
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• pp.145-152
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• 2008

The specification of the Home Evolved NodeB (Home-eNB), which is a small base station designed for use in residential or small business environment, is currently ongoing in 3GPP LTE (Long Term Evolution) systems. One of the key requirements for its feasibility in the LTE system is the mobility management in the deployment of the numerous Home-eNBs and other 3GPP network. In this paper, we overview the characteristic of Home-eNB and also describe the mobility management issues and the related approaches in 3GPP LTE based Home-eNB systems.

• 한국통신학회논문지
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• 제35권8B호
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• pp.1159-1169
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• 2010

This paper introduces the mobility-adaptive QoE provisioning solution. The key is placed on the intelligent selection of access network depending on the QoE criteria classified by the user mobility and the bandwidth demand for service. We further focus on the network-based smart handover scheme using the mobility-adaptive handover decision and the enhanced MIH-FMIP framework. The concept is the network-based calm service and the balance in order to facilitate vertical and seamless handover. In result, it is figured out that our solution improves QoE performance by selecting appropriate access network, repressing handover occurrence, and reducing handover delay as well.

• International Journal of Internet, Broadcasting and Communication
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• 제12권4호
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• pp.33-41
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• 2020

Nowadays, distributed mobility management (DMM) approaches have been widely adopted to address the limitations of centralized architectural methods to support seamless data transmission schemes in wireless sensor networks. This paper deals with the end-to-end (E2E) integration of Network Mobility (NEMO) basic support protocol in distributed wireless sensor network systems in structural health and environmental monitoring of social overhead capital (SOC) public infrastructures such as bridges, national highways, tunnels, and railroads. The proposed scheme takes advantage of the features of both the NEMO basic support protocol and partially distributed network-based DMM framework in providing seamless data transmission and robust mobility support. The E2E seamless data transmission scheme allows mobile users to roam from fixed-point network access locations and mobile platforms (i.e., vehicles such as cars, buses, and trains) without disconnecting its current sessions (i.e., seamless handover).

• 대한전자공학회논문지TC
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• 제47권12호
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• pp.69-77
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• 2010

본 논문에서는 이기종 무선 네트워크에서 다중 무선 네트워크 인터페이스를 이용한 고속 IP 이동성 관리 방법을 제시한다. 구체적으로, 핸드오버로 인한 패킷 손실과 핸드오버 지연시간을 최소화하기 위해, E-MAP과 이동 단말 간 멀티 캐스팅 터널링을 동적으로 생성하는 IETF HMIPv6를 확장한 E-HMIPv6를 제시하였다. E-HMIPv6는 IETF HNIPv6의 MAP의 확장, 핸드오버 절차, 동시 다중 터널링를 포함 한다. 제안된 방법의 우수성을 증명하기 위해 기존의 이동성 관리 방법과의 TCP과 UDP 기반의 어플리케이션에서의 성능 비교를 위해 NS-2 시뮬레이션을 수행하였다.