• Title/Summary/Keyword: parking control

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Utilization of Vitraified Glass as an Aggregate Source in Concrete (Vitrified Glass 콘크리트의 특성)

  • 민정기
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.6
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    • pp.90-96
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    • 1999
  • Over 4.1 billion metric tons of non-hazardous solid wstes are generated in the United States annually. Therefore, there is a need to reuse or reprocess as many products or by-products as possible. In this report, theaggregates produced from Naval Shipyard and Charleston area dredge spoils are designated as GP-21-23 and GP 4-5, repectively. The major objective of this study is to determine the feasiblity of the use of these aggregates in concrete. The followings are some of the conclusions, observations and recommendations regarding this portion of the research project. In most cases, the unit weight of concrete containing GP 21-23 and GP 4-5 (vitrified galss) lower than the control concrete, and the concrete containing vitrified glass produced lower compressive and bending strength compared to the control. However the concrete containing virtrified glass could be used in the field based on the minimum criterial set for the mix design. The use of vitrified glass in concrete is recommended in several applications except parking lots, side walks and main roads, because abrasion resistace is not high.

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Preliminary Design of LEO Satellite Propulsion System (저궤도위성 추진시스템 예비 설계)

  • Yu, Myeong-Jong;Lee, Gyun-Ho;Kim, Su-Gyeom;Choe, Jun-Min
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.85-89
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    • 2006
  • Propulsion System provides the required velocity change impulse for orbit transfer from parking orbit to mission orbit and three-axis vehicle attitude control impulse. New LEO Satellite propulsion system (PS) will be 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. In this study, preliminary design process of LEO Satellite propulsion system will be summarized.

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Design Procedure and Analysis of Ramp Profile in SFF HDD (초소형 하드디스크에서 램프 형상 분석 및 설계 프로세스 연구)

  • Lee, Yong-Hyun;Park, Kyoung-Su;Park, No-Cheol;Yang, Hyun-Seok;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.2 no.2
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    • pp.150-155
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    • 2006
  • Vertical L/UL (Load/Unload) velocity is very important parameter to determine the L/UL performance, and the vertical velocity is determined by the actuator velocity and the ramp profile. However, it is not easy to precisely control the actuator rotating velocity during the L/UL process. Especially in emergency parking, servo system doesn't operate, it is impossible to control an actuator velocity. Then, the vertical unloading velocity depends on only ramp profile. The ramp height and the sliding length for L/UL process in SFF (Small Form Factor) HDD are restricted due to slimness and small media. For these reasons, it is very difficult to design the ramp profile in SFF HDD. Therefore, this study analyzes the unloading dynamic characteristics for various ramp profiles and makes the thesis for ramp profile design.

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Deep Learning based Object Detector for Vehicle Recognition on Images Acquired with Fisheye Lens Cameras (어안렌즈 카메라로 획득한 영상에서 차량 인식을 위한 딥러닝 기반 객체 검출기)

  • Hieu, Tang Quang;Yeon, Sungho;Kim, Jaemin
    • Journal of Korea Multimedia Society
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    • v.22 no.2
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    • pp.128-135
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    • 2019
  • This paper presents a deep learning-based object detection method for recognizing vehicles in images acquired through cameras installed on ceiling of underground parking lot. First, we present an image enhancement method, which improves vehicle detection performance under dark lighting environment. Second, we present a new CNN-based multiscale classifiers for detecting vehicles in images acquired through cameras with fisheye lens. Experiments show that the presented vehicle detector has better performance than the conventional ones.

The Earth-Moon Transfer Trajectory Design and Analysis using Intermediate Loop Orbits (중개궤도를 이용한 지구-달 천이궤적의 설계 및 분석)

  • Song, Young-Joo;Woo, Jin;Park, Sang-Young;Choi, Kyu-Hong;Sim, Eun-Sup
    • Journal of Astronomy and Space Sciences
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    • v.26 no.2
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    • pp.171-186
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    • 2009
  • Various Earth-Moon transfer trajectories are designed and analyzed to prepare the future Korea's Lunar missions. Minimum fuel trajectory solutions are obtained for the departure year of 2017, 2020, 2022, and every required mission phases are analyzed from Earth departure to the final lunar mission orbit. N-body equations of motion are formulated which include the gravitational effect of the Sun, Earth and Moon. In addition, accelerations due to geopotential harmonics, Lunar J2 and solar radiation pressures are considered. Impulsive high thrust is assumed as the main thrusting method of spacecraft with launcher capability of KSLV-2 which is planned to be developed. For the method of injecting a spacecraft into a trans Lunar trajectory, both direct shooting from circular parking orbit and shooting from the multiple elliptical intermediate orbits are adapted, and their design results are compared and analyzed. In addition, spacecraft's visibility from Deajeon ground station are constrained to see how they affect the magnitude of TLI(Trans Lunar Injection) maneuver. The results presented in this paper includes launch opportunities, required optimal maneuver characteristics for each mission phase as well as the trajectory characteristics and numerous related parameters. It is confirmed that the final mass of Korean lunar explorer strongly depends onto the initial parking orbit's altitude and launcher's capability, rather than mission start time.

Improvement of Soil Quality for Artificial Planting's Ground with Large Integrated Underground Parking Lot in Apartment Complex (대규모 지하통합주차장을 갖는 공동주택 인공식재지반 토양품질 개선방안)

  • Kang, Myung-Soo;Lee, Eun-Yeob;Lee, Jung-Min;Kim, Mi-Na
    • Land and Housing Review
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    • v.6 no.1
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    • pp.31-39
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    • 2015
  • Most landscape areas in apartment complex have been changing. Increasing the area of underground parking lots have an effect on apartment's circumstance. Natural ground was decreased so that the most space in apartment complex were converted into an artificial ground. To suggest the soil quality management, this study examined the actual situation about the soil quality of planting ground such as the quality standard as artificial soil, the difference of natural ground, and the difference of soil quality according to the work classification. As a result, the soil quality of the apartment complex with a large underground parking lot had low quality of soil. Soil physical properties were relatively fine but soil chemical properties needed the quality control. The soil quality of natural ground and artificial ground was not statistically significant and the soil quality by the work classification also had no statistical significance. Therefore, we established improvements about standards of the chemical properties for quality management, the soil quality in the natural ground and applying the equivalent standard according to the work classification.

Determination of EMCs and Comparison with Sampled Concentrations in Paved Areas (포장지역에서의 강우사상별 EMC 산정 및 단순 샘플농도와의 비교)

  • Lee, Eun-Ju;Ko, Seok-Oh;Kang, Hee-Man;Lee, Joo-Kwang;Lee, Byung-Sik;Lim, Kyeong-Ho;Kim, Lee-Hyung
    • Journal of Korean Society on Water Environment
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    • v.22 no.1
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    • pp.104-109
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    • 2006
  • TPLMS programs in four large rivers have been developed to improve the water quality from possible pollutants originated from watershed areas. The success of TPLMS program is depended on nonpoint source control. Currently, the pollutant loading from nonpoint pollution sources is gradually increasing as developing the nearby watershed. However, there are not enough data concerning on nonpoint pollution in Korea because of lacking of monitoring activities. It is the main reason of uncertainty. Therefore, this manuscript will summarize the EMCs in various landuses based on monitoring program. Also the EMC in each paved area will be compared and discussed to find the differences. When the EMC is compared by average monitored sample concentrations, the EMC values are 2-4 times higher than sample concentrations. It means the monitoring program is very important in the field of nonpoint pollution. The pollutant loadings from bridge landuse is higher than loadings from parking lot and highway because of more traffic activities.

An Experimental Study on Ventilation of Connection Passage and Elevator Hall of Underground Parking in the Apartment Houses (공동주택의 지하주차장 연결통로 및 엘리베이터 홀의 환기에 관한 실험적 연구)

  • Kim, Il-Gyoum;Park, Woo-Cheul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1523-1528
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    • 2008
  • In this study, the ventilation system of connection passage and elevator hall of underground parking lot in apartment houses is investigated to extract the data for the installation and the application by the experimentation. In case of the elevator hall, actual air exchange rate is predicted fivefold higher than air exchange rate by infiltration and exfiltration. Ventilation system is installed good by supply air and return air. As the next best thing, it is installed by supply air because of IAQ control. The temperature of connection passage and elevator hall uniformly with $7{\sim}8^{\circ}C$, is maintained even if the operating condition of ventilation system is different. Therefore, the installation of the preheater, which is installed at the inlet of ventilation system for the cold draft in winter, is not essential in southern area of Korea.

The Tentative Plans of Middle-rise Traditional Houses (Han-ok) Located on Seoun-dong in Urban Area of Cheongju, Korea (중층형 생활한옥 모델시안 연구 - 청주 서운동의 사례를 중심으로 -)

  • Kim, Chan Gu;Kim, Tai Young
    • Journal of the Korean Institute of Rural Architecture
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    • v.24 no.2
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    • pp.21-28
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    • 2022
  • Focusing on the creation of a new han ok, especially a mid-rise hybrid-structured Han-ok, this study proposes a middle-rise (four-story) Han-ok on one and two lots located in Seoun-dong, the existing Han-ok intensive housing site in downtown Cheongju. 1) In terms of layout and function, according to the existing L-shaped Han-ok corresponding to the road and the direction, the parking lots and shops on the 1st floor, the business facility on the 2nd floor, the Han-ok on the 3rd and 4th floors are placed. There are yards, open roof yards, and semi-open Daecheong(大廳, main hall), which can be shared by residents. 2) In terms of structure and form, one or two floors (some 3 floors) are 5.4m square and 5.4×6.6m modules of the RC(Reinforced Concrete) group, and the upper floor reflects the 2.7m module, size and shape of the existing Han-ok. By extending the outer wall of the RC group in the lower floors (1st to 3rd floors) to the wooden exterior of the upper floors (2nd to 4th floors), it is attempted to avoid the awkward appearance of the RC group being exposed to wooden structures. And it is also attempted to reflect the wooden shape and design elements through the elevation elements such as horizontal windows, corner windows, picture frames, and vertical slits. 3) In environmental control and facilities, it is attempted to smooth the ventilation of the building by forming a vertical upward airflow from the dark space of the low floor to the positive of the upper floor. This doubles the effect through a vertical rise of cold air generated in a narrow alleyway, piloti parking lot, and the various voids. In addition to the Daecheong and Numaru(loft) of Han ok, the rooftop yard, the terrace, and the balcony, horizontal natural ventilation is generated through divided doors and transom windows.

Performance Comparison of Automotive Air conditioning System by using R134a and R152a (R134a와 R152a 냉매를 이용한 자동차용 에어컨 시스템의 성능 비교)

  • Kim, Jeong-Su;Nam, Su-Byung;Lee, Dae-Woong;Yoo, Seong-Yeon;Kim, Jin-Hyuck
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.9-14
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    • 2006
  • This study presented the feasibility of R152a refrigerant as an alternative of R134a which is used in the current automobile air conditioning system. The performance of air conditioning system installed in the actual vehicle was tested using the climate wind tunnel. The experiments were conducted at various refrigerant charge quantities and various driving conditions such as city traffic, highway traffic and parking. Same components and lubricant were used for both R134a and R152a system. The effects of air set values of thermal expansion valve on the performance were also investigated. In case of the R152a system, refrigerant charge quantity can be reduced about 20%, better performance and superior compressor durability is expected due to the lower discharge pressure compared to the R134a system.

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