• Title/Summary/Keyword: 안전한 활용

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Study(III) on the Development of Charts and Formulae Predicting Allowable Axial Bearing Capacity for Prebored PHC Pile Socketed into Weathered Rock through Sandy Soil Layer - The Proper Use of Long-term Allowable Compressive Load of PHC Piles by Analyzing Quality Test and Product Specifications Data - (사질토층을 지나 풍화암에 소켓된 매입 PHC말뚝에서 지반의 허용압축지지력 산정도표 및 산정공식 개발에 관한 연구(III) - 품질 성능 검사 자료 및 성능 제원 표 분석을 통한 PHC말뚝의 장기허용압축하중 성능의 올바른 활용 -)

  • Kim, Chae Min;Yun, Dae Hee;Lee, Chang Uk;Choi, Yongkyu
    • Journal of the Korean Geotechnical Society
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    • v.35 no.9
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    • pp.15-28
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    • 2019
  • Long-term allowable compressive Loads of PHC piles were analyzed based on qualification tests results by 17 small and medium PHC pile producing companies and product specifications by 6 major and 17 small and medium PHC pile producing companies. At the present stage, an average long-term allowable compressive load of PHC pile was designed at 70% level from current design data, and safety factor of 4.0 was applied to long-term allowable compressive loads of PHC pile despite of its excellent quality. Most quality standards of PHC pile are specified at KS F 4306. But compressive strength test method of spun concrete is specified at KS F 2454. As a result of analyzing quality test data supplied by each manufacturer, all quality test results showed higher performances than standard values. Therefore, it was considered that the capacity of PHC pile can be used up to the maximum allowable compressive load of PHC pile when PHC pile is designed.

Numerical Study on Towing Stability of LNG Bunkering Barge in Calm Water (LNG 벙커링 바지의 정수 중 예인안정성에 관한 수치연구)

  • Oh, Seunghoon;Jung, Dongho;Jung, Jae-Hwan;Hwang, Sung-Chul;Cho, Seok-kyu;Sung, Hong Gun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2019.05a
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    • pp.185-188
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    • 2019
  • In this paper, the towing stability of the LNG bunker barge is estimated. Currently, LNG bunkering barge is being developed as an infrastructure for the bunkering of LNG (Liquefied Natural Gas), an eco-friendly energy source. Since the LNG bunker barge are in the form of towed ship connected to the tow line, the towing stability of the LNG bunker barge is very important for the safety of not only the LNG bunker barge but also the surrounding sailing vessels. The numerical code for towing simulation was developed to estimate the towing stability of the LNG bunker barge at the initial design stage. The MMG(Manoeuvring Mathematical Group) model was applied to the equations of motion and the empirical formula was applied to the maneuvering coefficients so that they could be used in the initial design stage. To validity of the developed numerical code, it was compared with published calculation and model test results. Towing simulations were carried out according to with and without stern skeg of the LNG bunker barge using the developed numerical code. Through the results of the simulations, the appropriateness of the stern skeg area designed was confirmed.

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Study on Needs and Satisfaction of Service Related to Assistive Device and Assistive Device for Long-Term Care Elderly : Focused on Beneficiary Older Adults People in Long-term Care Insurance (노인복지용구의 품목 및 서비스의 만족도와 요구도에 대한 연구:노인장기요양보험 등급 인정자를 중심으로)

  • Woo, Ji-Hee
    • The Journal of the Korea Contents Association
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    • v.19 no.9
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    • pp.348-356
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    • 2019
  • This study is was to suggest improvement of assistive device for the elderly according to investigate the satisfaction and the needs of assistive device for elderly. The subjects were 184 beneficiary older adults in long-term health insurance who used home care service in I city and D city. Data were analyzed using SPSS 20.0. With the exception of cognitive assistance grade, subjects were showed from 'normal' to ' satisfied' on a types of assistive device and services related to assistive device. I, II grade subjects needed assistive device for self-care. III, IV and V grade subjects needed assistive device for safety and health maintenance. In the service related assistive device, All subjects needed service on 'periodic follow-up service', 'expert on assistive device' and 'comprehensive evaluation'. This results is significant in that it suggest to needed assistive device in accordance with grade unlike previous studies. Results of this study will expected to utilize as a basic evidence for improvement of assistive device, service related to assistive device for elderly.

Study on the effect of cable on the lateral behavior of S-shaped Pedestrian-CSB (S형 보도사장교의 케이블이 횡방향 거동에 미치는 영향 연구)

  • Ji, Seon-Geun;Yhim, Sung-Soon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.577-584
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    • 2019
  • Recently, CSB(Cable-Stayed Bridge) have been attempted to be atypical forms for landscape elements in Korea. CSB with new geometry need to analyze their characteristics clearly to ensure structural safety. This study's bridge is the S-shaped curved pedestrian CSB that has a girder with S-shape plane curve and reverse triangular truss cross section, inclined independent pylon, modified Fan type main cable and vertical backstay cable. Curved CSB can have excessive lateral displacement and moment when the tension is adjusted, focusing only on longitudinal behavior, such as a straight CSB. In order to analyze the effect of the cable on the lateral behavior of bridges, the cable is divided into two groups according to the lateral displacement direction of the pylon due to tension. The influence of the combination ratio of GR1 and GR2 on the girder, bearing, pylon, and vertical anchor cable was analyzed. When the tension applied to the bridge is 1.0GR1 plus 1.0GR2, In the combination of 1.2GR1 plus 0.8GR2, the stress on the left and right upper member of the truss girder and the deviation of the both were minimized. In addition, the horizontal force of the bearing, the lateral displacement and moment of the pylon, and the tension of the vertical backstay cable also decreased. This study is expected to be used as basic data for determination of tension of CSB with similar geometry.

Monitoring of aquatic medicine managements in South Korea (국내 수산용의약품의 관리 현황 모니터링)

  • Kim, Young-Jae;Seo, Jung-Soo;Park, Jeon-Oh;Jeong, Ah Reum;Lee, Ji-Hoon
    • Journal of fish pathology
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    • v.32 no.1
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    • pp.37-43
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    • 2019
  • Due to the rapid global expansion of aquaculture industry during the past decades, production volume of aquatic organisms has accordingly grown. This has been accompanied by a rise in the incidence of diseases in aquatic organisms, leading to an increased use of aquatic medicines. While aquatic medicines are essential for the prevention and treatment of diseases of aquatic organisms, misuse can cause evolution of antibiotic-resistant bacteria and pose serious problems to the safety and hygiene of fisheries products. In this study, we surveyed and compared, by analyzing data compiled by all national control centers for aquatic animal diseases in South Korea, to estimate the amount of aquatic medicines sold in different regions between 2012 through 2015. Since we also examined the marketing routes of aquatic medicines, this basic data can be utilized for policy implementation to improve drug safety. In the future research, however, it will be clearly necessary to estimate directly the amounts of drugs actually applied to aquaculture organisms. The current sales figure data should be helpful for preparation of an effective system for aquatic drug use management.

Characteristics of Mine Liner According to the Replacement Ratio of Nano-Silica and Silica-Fume (나노실리카 및 실리카흄 대체율에 따른 차수재의 특성)

  • Kang, Suk-Pyo;Lee, Hee-Ra;Kang, Hye-Ju;Nam, Seong-Young;Kim, Chun-Sik
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.7 no.1
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    • pp.66-73
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    • 2019
  • Approximately 80% of the mines are vacated or abandoned mines and are mostly left without suitable environmental treatment facilities. In the area around the abandoned mine site, problems such as drainage of acidic city drainage and leakage of leachate occur, and ground subsidence caused by this can cause a safety accident due to sink hole occurrence. In this study, flow, compressive strength, water uptake, pore and hydration characteristics were investigated to investigate the basic properties of liner and cover material based on the replacement ratio of nano silica and silica fume in the existing blast - furnace slag fine powder. As a result, as the substitution ratio of nano silica and silica fume increased, the flow and compressive strength of nano silica specimens increased and the absorption rate decreased. In the case of pore characteristics, the amount of pores decreased as the substitution ratio of nano silica and silica fume increased. Especially, the capillary porosity of 10-1,000 nm diameter decreased. Ray diffraction analysis and SEM measurement showed that the peak positions of the hydration products were almost the same when compared with the 5% alternative test samples of Plain and silica fume.

The social role of record information management for Sewol ferry disaster (세월호 참사에 관한 기록정보관리 분야의 사회적 역할)

  • Kim, Jin Sung
    • The Korean Journal of Archival Studies
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    • no.44
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    • pp.199-215
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    • 2015
  • This study suggest the social role of record information management for Sewol ferry disaster on sea near Jindo-gun at April 16, 2014. Social each part and the discrete member be going to carry out the social role for the disaster so that record information management part may be gather, operate, provide related record informations. Record informations is ways to reflect, to supplement about something and means to effect it. They naturally generated though automatic managed, it need to purposeful activity. From finding to lack, to remedy a problem, Korean society and record information management part shall be reinforcing directions and competency of the solution with various angles. Practical union and assistance of record information management part for Sewol ferry disaster, at first it be a help to recognize officially evidence for the accident. Secondary it producing and using better than current state of the area's record information part. Finally it may be actively comprise and implement our competency and emotion.

A Development of Work Breakdown Structure and Link to Standard Estimation System for 3D Printing Building (건축물 3D 프린팅 공종분류체계 도출 및 표준품셈 연계방안 제시)

  • Ju, Ki-Beom;Seo, Myoung-Bae;Park, Hyung-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.12
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    • pp.702-708
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    • 2018
  • 3D printing technology is attracting increasing attention as a key technology of the fourth industrial revolution that can change the production paradigm of existing industries. The introduction of construction 3D printing technology has been slower than other industries because of the characteristics of the construction field. On the other hand construction automation using 3D printing is required to reduce the production population, as well as improve productivity and safety. In this study, a construction 3D printing work breakdown structure and link method to a standard estimation system were developed as a preliminary preparation for introducing 3D printing to construction. Based on expert consultation on construction and 3D printing, a hypothetical scenario was developed based on existing construction 3D printing technology. According to the scenario, 16 kinds of works required for 3D printing construction work were derived. The existing work breakdown structure and standard estimation system were analyzed, and the 3D printing work was linked. 3D printing works that were the same as the existing breakdown structure were found, and non-existent works were added to the similar breakdown structure. These results are expected to be helpful for future 3D printing construction management and cost estimation. The actual standard estimation system through 3D printing work will need to be calculated.

A Study on the Haptic Control Technology for Unmanned Military Vehicle Driving Control (무인차량 원격주행제어를 위한 힘반향 햅틱제어 기술에 관한 연구)

  • Kang, Tae-Wan;Park, Ki-Hong;Kim, Joon-Won;Kang, Seok-Won;Kim, Jae-Gwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.12
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    • pp.910-917
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    • 2018
  • This paper describes the developments to improve the feeling and safety of the remote control system of unmanned vehicles. Generally, in the case of the remote control systems, a joystick-type device or a simple steering-wheel are used. There are many cases, in which there are operations without considering the feedback to users and driving feel. Recently, as the application area of the unmanned vehicles has been extended, the problems caused by not considering the feedback are emphasized. Therefore, the need for a force feedback-haptic control arises to solve these problems. In this study, the force feedback-haptic control algorithm considering the vehicle parameters is proposed. The vehicle parameters include first the state variables of dynamics, such as the body side-slip angle (${\beta}$) and yawrate (${\gamma}$), and second, the parameters representing the driving situations. Force feedback-haptic control technology consists of the algorithms for general and specific situations, and considers the situation transition process. To verify the algorithms, a simulator was constructed using the vehicle dynamics simulation tool with CAN communication environment. Using the simulator, the feasibility of the algorithms was verified in various scenarios.

A Study on Customized Smart Fire and Security System for one person household (1인 가구를 위한 맞춤형 스마트 화재 및 방범 시스템에 대한 연구)

  • Han, Hoonyoung;Kim, Gyunho;Ju, Minsu;Ko, Dongbeom;Kim, Jungjoon;Park, Jeongmin
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.1
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    • pp.295-304
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    • 2019
  • This paper introduces a customized Smart Fire and Crime system for one person households. Recently, the number of one person household has skyrocketed due to the increasing number of one person household and the aging population. As a result, the demand for private security companies for one person household is increasing and smart security systems that are applied with rapidly evolving IoT and sensor technologies are also becoming a major issue. However, despite the increasing trend of one person households, the existing system focuses on multiple households, so that there are disadvantages of the one person households to operate in such a big system which operate separately. Therefore, in this paper, we design and implement a system that provides a personalized safety service for one person household that integrates a security system and a fire monitoring system. This will help prevent criminal activity in places where the police can not reach at a lower cost than using existing private companies, and help monitor the situation of the houses in real time.