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A study on the management status of public small-scale sewage treatment facilities and the improvement (마을하수도 운영실태 및 개선방안)

  • Shin, Dae-Yewn;Bae, Chul-Ho
    • Journal of environmental and Sanitary engineering
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    • v.23 no.4
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    • pp.55-64
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    • 2008
  • In this study, the management and improvement of public small-scale sewage treatment facilities was investigated. In order to improve the effective management of the operation of small-scale sewage treatment facilities, treatment methods and the problems associated with sewage treatment were carefully addressed based on the data and literature. The investigation results showed that sewer pipes in rural areas should be repaired to prevent sewage from leaking and small-scale operations should be required to have effective management for pollutant loads less than 50%. Also, new methods should be developed for low concentrations of sewage. A law associated with FRP treatment facilities should be established and local governments need to supervise these operations to avoid insufficient and faulty construction. It is recommended that new facilities are built with advanced treatment techniques when the old facility can not comply with nitrogen and phosphorous discharge limits. Moreover, the study shows that nutrient and coliform treatment efficiency improves when abandoned facilities are renovated with the installation of nitrification/denitrification and disinfection processes or another advanced process.

Design and Implementation for Construction Method of Management Network in MPLS-TP Network (MPLS-TP 망에서 관리 망 구축 방안에 대한 설계 및 구현)

  • Moon, Sungnam;Kang, Namhi
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.3
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    • pp.59-65
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    • 2015
  • To build a flexible network than traditional transport network, the carrier ethernet technology is emerging in network industry recently and MPLS-TP technologies are being applied as a major standard technology for the carrier ethernet. However, network management technologies required to handle equipment installed in MPLS-TP network are not clear. This paper propose an efficient method to build a management network automatically without any additional configuration when network equipments are installed in MPLS-TP network. The proposed scheme reduce cost required for both equipment installation and network maintenance by minimizing configuration procedures of connecting management system with network. We evaluated the effectiveness of the proposed scheme by applying the scheme to a real MPLS-TP equipment.

Implementation of Parking Management System using Cloud based License Plate Recognition Service (클라우드 기반의 자동차번호인식 서비스를 이용한 주차관제시스템 구현)

  • Kim, Dae-Jin
    • Journal of Digital Contents Society
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    • v.19 no.1
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    • pp.173-179
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    • 2018
  • With the recent increase in the number of cars and the lack of parking spaces, the number of parking businesses has increased. the parking management has become an essential element in parking business, and the parking management's company becomes an increasingly popular opportunity. However, as competition grows as more and more and companies increase in number, efforts are being made to create new services, gain technological excellence, or reduce costs through current system improvements. In this paper, we developed a parking management system using cloud based LPR(License Plate Recognition) service for effective parking. Structural improvements in the proposed system reduce costs, simplify installation, and respond quickly to failures and updates.

Selection of Business Types for the Installation of Nonpoint Pollution Source Control Facilities

  • Choi, Ji-Yong;Hwang, Dae-Ho
    • Environmental Engineering Research
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    • v.15 no.1
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    • pp.29-33
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    • 2010
  • In 2004, the Korean government launched comprehensive measures for nonpoint pollution that were intended to reduce their amount by 34.3% over of those forecast by 2020. During the first and second stages of their implementation; from 2004 to 2011, nonpoint source (NPS) measures have focused on systemic improvements and project management, as well as the introduction of optimal management techniques; accordingly, reductions have been small. However, during the third stage in 2011, serious reductions will be pursued. Accordingly, the gradual expansion of sites subject to NPS measures has focused on the establishment of a basis for reduction measures in connection with model projects during the first half of the plan, with full scale enforcement due in the second half. For Korea, rather than commencing NPS management en masse, it has been more appropriate to gradate NPS management into stages tailored to the different needs of new and existing businesses, as well as to the needs of large and small-scale businesses, in consideration of their specific circumstances. This has allowed sufficient time for such businesses to become accustomed to the concept of NPS management.

Development of ESS Based on VRFB-LFPB Hybrid Batteries (VRFB-LFPB 하이브리드 배터리 기반의 ESS 개발에 관한 연구)

  • Cheon, Young Sik;Park, Jin Soo;You, Jinho;Lee, Jin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.1
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    • pp.61-67
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    • 2018
  • High-power lithium batteries are suitable for equipment with high power output needs, such as for ESS's initial start-up. However, their management cost is increased by the installation of air-conditioning to minimize the risk of explosion due to internal temperature rise and also by a restriction on the number of charge/discharge cycles. High-capacity flow batteries, on the other hand, have many advantages. They can be used for over 20 years due to their low management costs, resulting from no risk of explosion and a high number of charge/discharge cycles. In this paper, we propose an ESS based on hybrid batteries that uses a lithium iron phosphate battery (LiFePO) at the initial startup and a vanadium redox flow battery (VRFB) from the end of the transient period, with a bi-directional PCS to operate two batteries with different DC voltage levels and using an efficient energy management control algorithm.

Development of the Compressed Packer Grouting Device for Preventing the Inflow of Polluted Groundwater (오염지하수 유입방지를 위한 압축패커 그라우팅 장치 개발)

  • Cho, Heuy-Nam;Choi, Sang-Il
    • The Journal of Engineering Geology
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    • v.19 no.4
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    • pp.433-439
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    • 2009
  • The compressed packer device is designed to improve the underground contamination prevention facilities of ground water wells. As for the device, the installation is simple because of the safety lock device and the compression of the casing are simple the installation is simple. There is no leakage of ground water because the pressure resistance with 4.5kg/cm2 makes it equipped with the watertightness The single casing is installed and the reaming for grouting is possible with 300 mm excavation so that installation cost can be saved. Silicon rubber is used for the compressed packer so that the extension rate is 590%. In terms of environmental pollution, it is an environmental friendly product which does not contain harmful ingredients such as Pb, Cd, and phenol. below the standard or undetectable level Furthermore, the installation costs are 35 to 62% or lower than the conventional grouting construction method and are 87% or lower than the expansion packer construction method, the new environmental technology No.47 Also, the device is designed to meet the relevant regulations such as Rules on Preserving the Ground Water Quality, The Standard on Jeju Island Ground Water Development and Facility Installation and Management, and The Plan and Guideline on Operating and Managing the Small-Scale Tap Water Facilities of Ministry of Environment and Ministry of Food, Agriculture, Forestry and Fisheries.

Development of an Enhanced Risk Management System for Construction Defect Control in Industrial Plants

  • Kihun Song
    • International conference on construction engineering and project management
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    • 2024.07a
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    • pp.1313-1313
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    • 2024
  • This paper proposes the development of an advanced Risk Management System (RMS) using Risk-Based Methodologies (RBM) specifically tailored for addressing construction defects in industrial plants. Urbanization and industrialization demand robust frameworks to handle the complexities and safety concerns in construction projects. Traditional risk management often overlooks critical aspects such as persistent construction defects. This paper discusses the development of an innovative Risk Management System (RMS) that integrates Risk-Based Methodologies (RBM) specifically for construction defect mitigation in industrial settings. The study centers around the implementation of Risk-Based Inspection (RBI) techniques, tailored to enhance traditional risk management systems. This includes developing a specialized risk assessment tool alongside an online management platform, designed to provide continuous monitoring and comprehensive management of construction risks. The proposed system-RBE-i (Risk-Based Execution for Installation)-focuses on identifying, evaluating, and mitigating risks effectively, utilizing a systematic approach that integrates seamlessly into existing construction workflows. The RBE-i system's core lies in its ability to conduct thorough risk analyses and real-time data provision. It uses digital technologies to improve communication, operational efficiency, and decision-making processes across construction projects. By applying these methodologies, the system enhances safety and ensures more efficient project execution by preemptively identifying potential risks and addressing them promptly. Field applications of RBE-i have demonstrated its effectiveness in significantly reducing construction defects, thus validating its potential as a transformative tool in construction risk management. The system sets new industry standards by shifting from reactive to proactive risk management practices, ultimately leading to safer, more reliable, and cost-effective construction operations. In conclusion, the RMS developed through this study not only addresses the pressing needs of construction risk management but also proposes a paradigm shift towards more proactive, structured, and technology-driven practices. The successful integration of the RBE-i system across various pilot projects illustrates its significant potential to improve overall project outcomes, making it an invaluable addition to the field of construction management.

The Cause Analysis and Research of Malfunction for Elevator Equipment of the Apartment House (공동주택의 승강기 설비에 대한 오동작 원인 조사 및 고찰)

  • Kim, Gi-Hyun;Bang, Sun-Bae;Kim, Chong-Min;Bae, Suk-Myong;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.4
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    • pp.65-71
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    • 2006
  • The number of elevator installation increases every year about 15,000. The number of confine-disease of elevator increases every year and then sudden in, sudden stop, error of level indication, stand; those can bring to uneasiness of elevator passenger and malfunction related life accident is increasing. Therefore we researched elevator repair diary of elevator repairing company, APT management office and 119 life rescue for elevator confine-disease during 2004. 1. 1.12. 31. we analyzed the content and the time type and cause of the malfunction and fault for APT elevator. Form the result of 119 life rescue, only power reset is 24[%] and only power failure is 8.2[%] by cause of confine-disease. This paper will be used data of the analysis for mutual relation between Power Quality and malfunction and fault of elevator.

A Study on Driving Safety Evaluations Using Full Scale Crash Test Data of Curb (연석의 실물차량 충돌시험 데이터를 이용한 주행안전성 평가에 관한 연구)

  • Kim, Jong-Min;Noh, Kwan-Sub;Kim, Jang-Wook;Byeon, Ji-Seok
    • Journal of the Korean Society of Safety
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    • v.27 no.2
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    • pp.98-104
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    • 2012
  • Current [Guideline for Installation and Management of Sidewalks and Safety Facilities on Roads] suggests that the types of curbs should be Barrier curb (85). Although Barrier curbs (90) were not specified in the guideline. The curbs installed on the roads currently are Barrier curbs (90) which are not specified in the installation standard. Therefore, it is critical to prepare for the installation standard of curbs by researching types of curbs and driving safety. This research have assessed the driving safety throughout Full Scale Crash Test according to type of curbs (Barrier curbs (85) and Barrier curbs (90)). Barrier curbs (90) showed higher figure in Theoretical head Impact Velocity, Post-impact Head Deceleration, Vehicle Damage when Crash, Passenger's Wounds Severity, and every other items than Barrier curbs (85). Barrier curbs (85) were found to have better Occupant Safety Index. Analysis of Behavior Using Full-Scale Crash Test showed difference depending on the Impact Condition between Barrier curbs (85) and Barrier curbs (90). Generally, Barrier curbs (85) were superior than Barrier curbs (90) in terms of protecting the passengers and vehicle damages. When an impact angle increases, Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs, two types of curb showed similarity. However, if an impact of an angle decreases, Barrier Curbs (85) showed excellence in Driving Safety such as Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs.

A Study on Priority Evaluation of the Rope-type Platform Safety Door(RPSD) Installation by Multi-criteria Decision Analysis (다기준 분석에 의한 로프형 승강장 안전도어의 설치 우선순위 산정에 관한 연구)

  • Jung, Byung Doo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.3
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    • pp.639-645
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    • 2015
  • Recently, a study on the commercialization of Rope type Platform Safe Door (RPSD) technology has commenced. The study focuses on RPSD, in which a rope screen ascends to allow safe passage from the platform to the transit vehicle in aboveground stations. Currently, a pilot installation has taken in place with Daegu Metro Line 2 in MoonYang station starting from March of 2013. However, there is a need to select an appropriate pilot installation's object for the improvement in the future RPSD. An appropriate designation would correspond with the needs of the railroad corporation and as a historic railway platform with safe facilities. This study tried to usa Analytic Hierarchy Process (AHP) to determine the priority of the KTX stations to attain a list of appropriate designations for future RPSD installations by analyzing the followings: management of the facilities, operational risks, and intent of business projects. As a case study, it was applied to the evaluation of the KTX stations. For the application, it used relative measurement to calculate the weight of upper level structuring, and absolute measurement for low level structuring instead of pairwise comparisons.