• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.875-878
• /
• 2003

최근 무선 인터넷의 발전으로 인하여 통신 환경의 변화가 급속하게 이루어지고 있다. 또한 PDA(Personal Digital Assistant)의 발전 속도가 일반 데스크탑 PC 의 발전 속도를 상회할 정도로 빠르게 성장하고 있으며, 고성능 모바일 CPU 가 사용되면서부터 다양한 주변기기들을 이용하는 형태까지 발전하고 있다. 이러한 무선 인터넷을 활용한 PDA 의 사용으로 보다 빠르고 다양한 정보의 교환을 할 수 있게 되었으며 사용자의 이동성을 보장하는 서비스의 제공이 가능해졌다. 이러한 무선 인터넷을 활용한 서비스는 현재 시행되고 있는 불법 주차 단속시스템에 신속성과 효율성을 부가하는데 적절하게 적용될 수 있다. 본 논문에서는 현재 대중화 되고 있는 PDA 와 무선 인터넷을 이용하여 현장에서 처리되는 불법 주차단속 사항을 주차 관리 중앙센터와 무선으로 연계하여 신속한 견인 및 조치가 이루어 질 수 있는 시스템을 설계 하고자 한다.

• Proceeding of Spring/Autumn Annual Conference of KHA
• /
• 2002.11a
• /
• pp.197-201
• /
• 2002

The purpose of this study is to provide the information of street planning for revitalization oft the community in urban detached housing area. This study was accomplished by observations and actual survey, and suggested several street planning methods; exclusion of the passing through car and control of the resident's car by one-way passage, protection of the parking area to inside individual lot by the ‘Break down Fence’ campaign in Daegu, and provide the common space for social contact and community According to this program, the public street space cant be changed into the semi-private space and the semi-public space as common territory.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2017.11a
• /
• pp.217-218
• /
• 2017

Residential apartment underground structures are being utilized for many purposes such as parking lots, community centers, fitness centers, etc. for efficient use of space. However, there are increasing problems of leakage due to various environmental and deterioration conditions. This paper proposes the development of an information network system which can serve as a base to provide solutions, alternatives and technical information for leakage prevention and effective design at the beginning of the construction stage.

• Proceedings of the KOR-KST Conference
• /
• 1998.09a
• /
• pp.79-90
• /
• 1998

The current increases in fuel price contribute to reducing level of congestion and air pollution. In this paper, this measure is compared with the congestion toll charge and the 10 'buje'(a $10\%$ demand control measure of registered vehicle i.e. each vehicle can not operate when its plate's last digit matches the last digit of the date). The purpose of our study is to give a priority order to various measures and to propose the win-win solution of Seoul for policy makers. We recommend the congestion toll charge coupled with some metering measures is the win-win solution for Seoul. Also we conclude a priority order such as metering; congestion toll charge; increase in parking fee; increase in fuel price; the 10 'buje' must be acceptable for implementation. Various ITS subsystems needed to support the proposed win-win solution are identified and field operational tests for them are introduced in this paper.

• Aerospace Engineering and Technology
• /
• v.7 no.1
• /
• pp.8-14
• /
• 2008

Basic characteristics of wheel brake accumulator for aircraft is studied. Wheel brake accumulator maintains the braking pressure for parking mode, and also it supplies the hydraulic pressure to the wheel brake system for emergency mode. The design requirements of wheel brake accumulator are analyzed and the initial sizing is conducted. A wheel brake accumulator consists of a cylinder and a brake control module, and the basic configuration and detail components are presented. Again, structural static analysis of vessel is performed with NASTARN/PATRAN for preliminary design.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.01a
• /
• pp.487-488
• /
• 2023

전 세계적으로 도시화가 가속화됨에 따라 도시 내 차량의 수가 지속해서 증가하고 있지만 주차 공간의 부족으로 인해 도심 내 불법주차 문제가 심각해지고 있다. 또한 주차된 차량의 운전자 정보가 노출된 환경으로 인해 개인 정보 유출이 중요한 사회적 문제가 되고 있다. 따라서 본 논문에서는 불법주차 해소와 운전자 개인정보 보호를 동시에 해결하기 위한 자율주행 로봇 시스템을 제안한다. 제안한 방법에서는 정상 주차를 식별하기 방안으로 마커 인식을 적용하였고 ROS 기반 Stella N1을 사용하여 자율주행할 수 있는 로봇을 제작하였다. 또한 전화번호 없이 운전자와 연락을 취할 수 있는 메시지전달 앱을 개발하였다.

• Journal of Power Electronics
• /
• v.15 no.2
• /
• pp.555-566
• /
• 2015

A TRIAC dimming LED driver that can control the brightness of LED arrays for a wide range of source voltage variations is proposed in this paper. Unlike conventional PWM LED drivers, the proposed LED driver adopts a TRIAC switch, which inherently guarantees zero current switching and has been proven to be quite reliable over its long lifetime. Unlike previous TRIAC type LED drivers, the proposed LED driver is composed of an LC input filter and a variable switched capacitance, which is modulated by the TRIAC turn-on timing. Thus, the LED power regulation and dimming control, which are done by a volume resistor in the same way as the conventional TRIAC dimmers, can be simultaneously performed by the TRIAC control circuit. Because the proposed LED driver has high efficiency and a long lifetime with a high power factor (PF) and low total harmonic distortion (THD) characteristics, it is quite adequate for industrial lighting applications such as streets, factories, parking garages, and emergency stairs. A simple step-down capacitive power supply circuit composed of passive components only is also proposed, which is quite useful for providing DC power from an AC source without a bulky and heavy transformer. A prototype 60 W LED driver was implemented by the proposed design procedure and verified by simulation and experimental results, where the efficiency, PF, and THD are 92%, 0.94, and 6.3%, respectively. The LED power variation is well mitigated to below ${\pm}2%$ for 190 V < $V_s$ < 250 V by using the proposed simple control circuit.

• Korean Institute of Interior Design Journal
• /
• v.22 no.2
• /
• pp.211-219
• /
• 2013

The purpose of this study is to propose the environmental planning guidelines of elementary school settings for a crime safety. The research methodologies To achieve the goal, the literature review analysis and the survey were used as main research methodologies. The survey is organized as follows. First, elementary education facilities were divided into 20 spaces based on the major space. Second, after analyzing the domestic and foreign CPTED Guidelines, elements of environmental planning were classified to fit in the space. Based on this, the expert survey was conducted. The results of this study are as follows; First, it is necessary to consider specific places such as 'toilets', 'parking lot', 'in-between space', 'main access road', 'sub-access road' and 'harmful facilities around school' for safer school environment. Second, it is significant to plan 'equipment facilities' and 'outdoor space in the school setting' with priority for elementary education environment. Third, environmental planning elements for safer elementary schools can be classified into 9 factors(types) including 'natural surveillance planning', 'territoriality reinforcement planning', 'mechanical surveillance planning', 'access control planning' and 'neighborhood reinforcement planning'. Forth, regarding 'indoor space', crime-free elementary school environment can be build through 'natural surveillance planning' and 'territoriality reinforcement planning'. Finally, regarding 'outdoor space', the crime can be prevented through 'natural surveillance planning' and 'access control planning'.

• Journal of Institute of Control, Robotics and Systems
• /
• v.20 no.4
• /
• pp.428-436
• /
• 2014

This paper proposes a statistical regression method for classifying pillars and vehicles in parking area using a single ultrasonic sensor. There are three types of information provided by the ultrasonic sensor: TOF, the peak and the width of a pulse, from which 67 different features are extracted through segmentation and data preprocessing. The classification using the multiple SVM and the multinomial logistic regression are applied to the set of extracted features, and has achieved the accuracy of 85% and 89.67%, respectively, over a set of real-world data. The experimental result proves that the proposed feature extraction and classification scheme is applicable to the object classification using an ultrasonic sensor.

• Aerospace Engineering and Technology
• /
• v.3 no.1
• /
• pp.97-102
• /
• 2004

Propulsion System provides the required velocity change impulse for orbit transfer from parking orbit to mission orbit and three-axis vehicle attitude control impulse. KOMPSAT-2 propulsion system(PS) is an all-welded, monopropellant hydrazine system. The PS consists of the subassemblies and components such as Thrusters, Propellant Tank, Pressure Transducer, Propellant Filter, Latching Isolation Valves, Fill/Drain Valves, interconnecting propellant line assembly, and thermal hardwares for operation-environment control of the PS. This paper summarizes a development process of the liquid propulsion system from the design engineering up to the test and evaluation.