• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.4
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• pp.700-707
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• 2018

Vehicles are used in daily life as convenient transport, it is important to authenticate driver because vehicles are controlled by driver. Especially, in these days, there is a discussion on introduction of Driving Under the Influence car-starting locking device installation for preventing accidents caused by Driving Under the Influence of alcohol, these car-starting locking device installation requires a lot of money and time. Suitable user authentication for solving user's inconvenience during the disabled and men of national merit to receive discount benefits is needed. In this paper, For solving these problems, we propose the efficient vehicle control and user authentication system for preventing driving under the influence and providing the disabled and men of national merit benefit based on driver authentication by using user's smartphone NFC communication and user's biometric information.

• ETRI Journal
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• v.25 no.3
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• pp.149-155
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• 2003

A self-pulsating multisection distributed-feedback laser diode (DFB LD) can potentially realize all-optical clock extraction. This device generally consists of three sections, two DFB sections and one waveguide section. The most important variable in this device is detuning, which is the relative spectral position between the stop bands of two DFB sections. We fabricated a novel structure in which two gratings were located one over and one under the active layers. Each grating structure was independently defined in processing so that detuning, which is the prerequisite for self-pulsation, could be easily controlled. Observing various self-pulsating phenomena in these devices under several detuning conditions, we characterized the phenomena as dispersive Q-switching, mode beating, and self-mode-locking.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.11
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• pp.4738-4744
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• 2011

This study proposes the system of new small sluice gate operated without the upper concrete structure. The new mechanism is composed of hydraulic system, driving mechanism to feed the floodgate up and down, hydrological locking device, safety device and etc. The hydraulic pumps and control systems away from the location of the sluice gate systems are installed and controled in place. The feed device with the hydraulic rack, pinion and hydraulic actuator is installed on the side of the sluice gate. The following results take the advantages of cost reduction, operation safety and compact product.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.65 no.4
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• pp.298-302
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• 2016

Currently, logistics are in small quantities and in diverse forms, and the amounts are continuously increasing. Railway logistics however are losing their market share every year mainly due to low operation speed and loading time, which means the trucks are covering the most of the freights. In order to solve these situations, this paper proposed the high speed freight train as working multi-modality with other modes to make effective transshipment. The high speed freight train has maximum operation speed of 300km/h and electric power to run centralized power supply. There are large dual door system, bogie system covering fluctuating load of 15[ton], automatic loading device, ULD(unit load device) bed and ULD locking system in this freight rolling stock. We calculated the performance of powering and braking capacity for this train and proposed how many vehicles are composed of train set. The results in this paper can help to make a decision to define the technical specification of High-speed freight train for the efficiency of rail freight service.

• Journal of IKEEE
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• v.9 no.2 s.17
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• pp.115-122
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• 2005

We report 400 femto-second highly stable, nearly transform-limited, pulse generation at 10 GHz in $1540{\sim}1550$ nm wavelength region by adiabatic soliton pulse compression of an actively mode-locked fiber ring laser output. Without using any supermode selection device, supermode beating noise has been suppressed below -123 dB/Hz, resulting less than 100 femto-second timing jitters at the noise band of $1\;kHz{\sim}100\;MHz$.

• Journal of the Korean Society for Precision Engineering
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• v.19 no.8
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• pp.203-211
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• 2002

ABS (Anti-lock Braking System) is a safety device for preventing wheel locking in a sudden braking. It consists of hydraulic modulator, ECU(Electronic Control Unit) and angular velocity sensors. Its control methods are classified into three types; deceleration control, slip ratio control and deceleration/acceleration control. In this paper, ABS mounted vehicle is mathematically modeled and the proposed model is verified by actual cars experiments, and the braking characteristics of the control methods with pulse width modulation are compared and analyzed through computer simulations.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.422-425
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• 2008

홈 네트워킹은 검색, 광고, 제어, 이탈 등 여러 가지 기능적 요소로 이루어진다. 이러한 기능 중 장치 제어의 경우 사용자에 의해서 제어 되는 장치는 특정 사용자에 의해서만 조작 되어야 하는 필요가 있다. 본 논문에서는 다중 사용자간 특정 장치를 다른 사용자가 사용하지 못하도록 보호하는 방법을 제안하기 위해 UPnP architecture 를 이용 한 홈 네트워크 구현 후 특정 사용자에 의하여 장치가 제어 되도록 하는 디바이스를 잠금 하는 방식에 대해 소개하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.766-768
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• 2016

Conventional locking device has a disadvantage such as a security vulnerability caused by using avoid traces of the keypad that are frequently used due to the complex password application. In this study, we proposed a OTP based locks by using user identical informations that overcomes the disadvantages of the conventional apparatus. We implemented and validated the proposed algorithm through simulations.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.5 no.3
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• pp.71-79
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• 2006

ABS is a safety device for preventing wheel locking in a sudden baking. Its control methods are classified into three types; deceleration control, wheel slip control and deceleration/acceleration control. The braking force takes the influence of the friction coefficient between road and tire, which in turn depends on the wheel slip as well as road conditions. In this paper, it has been proposed the wheel slip control system to apply the adaptive control method at the ABS. To maintain wheel slip to desired wheel slip, it have been done the linearization and designed the adaptive controller to apply gradient method based on the reference model. It is illustrated by computer simulations that the proposed control system gives good performances and adaptation to parameter variation.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.300-301
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• 2015

본 논문에서는 스마트폰 기반 원격 자전거 장금 장치를 설계한다. 전원 공급이 따로 없는 장금 장치의 특성상 저전력 동작이 필수적이다. 따라서 스마트폰과의 통신을 위해 BLE (Bluetooth Low Energy)의 사용을 제안하였으며, 그 결과 장치의 전력 소모를 줄일 수 있을 것으로 기대한다. 또한 자전거에 부착된 소형발전기를 이용해 생산한 에너지를 활용한 배터리 충전 시스템을 설계에 반영함으로써 배터리의 방전으로 인한 장금 장치의 오작동을 예방할 수 있다.