• 제목/요약/키워드: Long-term settlement

Search Result 193, Processing Time 0.028 seconds

Evaluation of Discharge Capacity with PVDs Types in Waste Lime Area (폐석회지반에서의 연직배수재의 종류에 따른 통수능 평가)

  • Shin, Eun-Chul;Kim, Gi-Han
    • Journal of the Korean Geosynthetics Society
    • /
    • v.7 no.1
    • /
    • pp.39-44
    • /
    • 2008
  • Recently, the demand for industrial and residential lands are being increased with economic growth, however, it is difficult to acquire the land for development with good ground condition. For efficient and balanced development of land, new development projects are being carried out not only the areas with inland but those with the soft ground as well. As soft grounds have complex engineering properties and high variations such as ground settlement especially when their strength is low and depth is deep, it needs to accurately analyze the engineering properties of soft grounds and find general measurement for stabilization and economic design and management. Prefabricated vertical drain technology is widely used to accelerate the consolidation of soft clay deposits and dredged soil under the preloading and various types of vertical drain are being used with the discharge capacity. Under field conditions, the discharge capacity is changed with various reason, such as soil condition, confinement pressure, long-term clogging and folding of vertical drains, and so on. Therefore, many researcher and engineer recommend the use of required discharge capacity. In this paper, the experimental study were carried out for two different types of vertical drains by utilizing the large-scale model tests and waste lime.

  • PDF

A Study on the Substantial impact of US high rate tariff policy on the Korean companies -Based on analysis of Article 301 of the US Trade Law -

  • Nam, Seon Mo
    • International Journal of Advanced Culture Technology
    • /
    • v.7 no.4
    • /
    • pp.63-68
    • /
    • 2019
  • Recently, the United States and China have declared a 25% retaliatory tariff for the partner country products of 50 billion dollar scale. "Trade war" is getting full swing. Such conflicts between economic powers may spread to Japan like the domino phenomenon following the EU (European Union) and become bigger in the global trade war. As a result, Korea has an economic system with a high degree of external dependence, and there is an expert's analysis that it will become the largest victim of the global trade war. If the WTO Dispute Settlement Authority approves this US 301 retaliation measure in the same way as the past case (US-EU hormone-treated beef imports), the United States will not import any Chinese imported products Chinese products) can be imposed. If the US launches a special 301 or super 301, which is stronger than the regular 301, then China is very likely to enforce US retaliation against it, and the trade war between the two countries could become a reality. This phenomenon is likely to have a negative impact on Korean companies. In particular, Korea, which is highly reliant on intermediate goods exports to China, is expected to suffer a great deal of damage. Therefore, Korea needs flexible response at home and abroad, it is necessary to enhance the autonomy of companies and protect export industries. Adjusting corporate tax rate as well as domestic industry height will be one way. The long-term (21 months) trade war between the United States and China has resulted in economic uncertainty. The resulting damage must be compensated. It is necessary to prepare the compensation through the economic council between countries. In the future, the punitive damage compensation system should be introduced.

Material Properties of Fast hardening Polymer Mortar by Fine Aggregate Types and Replacement Ratio (잔골재 종류 및 치환율에 의한 속경성 폴리머 모르타르의 재료 특성)

  • Shin, Seung-Bong;Kim, Gyu-Yong;Nam, Jeong-Soo;Shin, Kyoung-Su;Lee, Bo-Kyeong
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.23 no.4
    • /
    • pp.145-151
    • /
    • 2019
  • The Physical performance of use materials was evaluated to improve durability of fast-paced repair mortar used at rapid construction sites. The fastening performance and basic performance were evaluated by substituting ferronickel grinding slag residues, rapid settlement, and EVA-based polymer for mortar. As a result, the compressive strength, flexural strength and adhesion strength were increased due to the use of FS Fine Aggregate and RS Fine Aggregate. The chloride ion promotion test of fast-polymer mortar kept the chloride inhibitory performance from 7 days to 28 days when fNS was used less than 50%. Durability degradation due to the use of FS Fine Aggregate and RS Fine Aggregate has not been found, and it is believed that further consideration of economic and long-term durability will be required for use as alternative Aggregate for construction and civil engineering.

Comparison of solar power prediction model based on statistical and artificial intelligence model and analysis of revenue for forecasting policy (통계적 및 인공지능 모형 기반 태양광 발전량 예측모델 비교 및 재생에너지 발전량 예측제도 정산금 분석)

  • Lee, Jeong-In;Park, Wan-Ki;Lee, Il-Woo;Kim, Sang-Ha
    • Journal of IKEEE
    • /
    • v.26 no.3
    • /
    • pp.355-363
    • /
    • 2022
  • Korea is pursuing a plan to switch and expand energy sources with a focus on renewable energy with the goal of becoming carbon neutral by 2050. As the instability of energy supply increases due to the intermittent nature of renewable energy, accurate prediction of the amount of renewable energy generation is becoming more important. Therefore, the government has opened a small-scale power brokerage market and is implementing a system that pays settlements according to the accuracy of renewable energy prediction. In this paper, a prediction model was implemented using a statistical model and an artificial intelligence model for the prediction of solar power generation. In addition, the results of prediction accuracy were compared and analyzed, and the revenue from the settlement amount of the renewable energy generation forecasting system was estimated.

Structural Analysis and Safety Assessment for Constricted Bridges (협착교량의 구조해석 및 안전성 평가)

  • Jeong, Jae-Hun;Kim, Moon-Ok;Choi, Hyun-Ho;Kim, Jang-Hwan
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.26 no.6
    • /
    • pp.33-38
    • /
    • 2022
  • As the intense heat continues, many cases of highway pavement blow up and bridge expansion joints damages have been inspected. Especially, Expansion joint closure of bridges is an important problem that can threat the safety of the bridge structure or reduce long-term durability. This paper proposed a structural analysis method for bridges having expansion joint closure and structural analysis was performed to verify the effects according to bridge types. Analysis bridges were divided into four types: concrete and steel bridges, shallow and piled foundations. To induce the situation of abutments and bridge decks are jammed, the following loads were additionally considered; lateral flow pressure, pavement expansion by alkali-aggregate reaction, creep settlement of backfill. The structural analysis method was verified by comparing the structural analysis results with the actually measured joint gap data. In addition, behavioral analysis due to joint closure was conducted to confirm the change in safety ratio by type of superstructure as the axial force increased.

A Study on Reforming the Occupational Health Care System is Korea (산업보건서비스체계의 효율적 관리방안에 관한 연구)

  • 문옥륜;한동운;최병순;최재욱;하은희;이기효;장동민
    • Health Policy and Management
    • /
    • v.4 no.1
    • /
    • pp.138-175
    • /
    • 1994
  • The objectives of this study are (i) to review current situations and problems of the occupational health care system with emphasis on reforming the organizations and services, (ii) to find out a disirable occupational health system model based on integration of the occupational health system and the general health system, and finally, (iii) to suggest policy implications in occupational health services in the light of objectives of the newly emerging national health insurance reform in Korea. The major policy implications of this study are as follows: 1. In the long-run, within the occupational health system, preventive occupational health services such as employees' physical check-up, working environment examination, etc should financially be integrated with industrial accident compensation insurance. Currently separately paying expenses for each different category of services by the owner of an enterprise should be disbursed once through the payment of contributions of industrial accident compensation insurance. And then, it is necessary to strengthen and expand the role and function of industrial accident compensation insurance to cover preventive occupational health services. 2. The occupational health system should be integrated with general health system for its effective management. For the short-term policy, it is necessary to eliminate fiscal and access barrier between industrial accident compensation insurance and national health insurance by means of ex post facto settlement of accounts. The duplication of employees' physical check- ups between under the health insurance program and under the industrial health services must be coordinated in a manner either through mutual authorization by the two parties concerned or through merge into the health insurance. 3. The intent of current employees' physical check-up system focused on detection of occupational diseases, should be converted to an idea of medical surveillance system or biological moritoring system. The introduction of medical surveillance or biological monitoring system is a necessary condition to build a positive, effective and inexpensive occupational health care system.

  • PDF

Case Study on the Development of STEAM Instruction Material for Mathematics Subject-Based Advanced Technology and ICT Teaching Tools (초등수학 교과 기반 첨단 기술 및 ICT 교구 활용형 융합교육 자료 개발에 대한 사례 연구)

  • Lee, Jong-hak
    • Journal of the Korean School Mathematics Society
    • /
    • v.25 no.4
    • /
    • pp.333-352
    • /
    • 2022
  • This study is aimed at developing the STEAM instruction materials for mathematics subject-based advanced technology and ICT teaching tools. In order to develop the STEAM materials, a PDI model in which the implementation and evaluation steps were simplified to Improvement was used. The developed STEAM materials were revised and supplemented by a group of experts. The subject of the STEAM class material developed in this study is 『Graph! The bridge that connects the past, present and future』 , 『You are the same but different!』 , 『Creating a virtual reality three-dimensional space together』 , 『And making interesting figures』 and 『Cover the roof of the turtle ship!』 . As a suggestion based on the results of this development study, various STEAM education materials should be developed and shared so that STEAM education can be performed in the elementary education field. And for the spread and settlement of STEAM education, the cultivation and expansion of STEAM education capabilities of on-site elementary school teachers or pre-service teachers will be an absolute prerequisite. And this suggests the need for a continuous and long-term approach to follow-up research on STEAM education.

Investigation on Water Leakage-Induced Tunnel Structure and Ground Responses Using Coupled Hydro-Mechanical Analysis (수리역학 연계해석을 이용한 누수로 인한 터널 구조물 및 지반 거동의 분석)

  • Dohyun Park
    • Tunnel and Underground Space
    • /
    • v.33 no.4
    • /
    • pp.265-280
    • /
    • 2023
  • Water leakage in tunnels is a defect that can affect tunnel stability and the ground movement by changing the stress and pore water pressure of the surrounding ground. Long-term or large-scale water leaks may lead to damage of tunnel structure and the surrounding environment, such as tunnel lining instability and ground surface settlement. The present study numerically investigated the effects of water leakage on the structural stability of a tunnel and the ground behavior. The tunnel was assumed to be under undrained conditions for preventing the inflow of the surrounding water and leaks occurred in the concrete lining after completion of the tunnel construction. A coupled hydro-mechanical analysis using a TOUGH-FLAC simulator developed in Python was conducted for assessing the leakage induced-behavior of the tunnel structure and ground under different conditions of the amount and location of water leak. Additionally, the effect of hydro-mechanical coupling terms on the results of coupled response was investigated and discussed.

Sequential Analysis of Adjacent Ground Behaviors Caused by Deep Excavations (굴착 공정별 주변지반 거동 분석)

  • Seo Min-Woo;Seok Jeong-Woo;Yang Ku-Seung;Kim Myoung-Mo
    • Journal of the Korean Geotechnical Society
    • /
    • v.22 no.2
    • /
    • pp.19-28
    • /
    • 2006
  • Long-term field observations were performed in three excavation sites in order to investigate the displacement behavior of adjacent ground during overall excavation procedure, where the depths of deep excavations were 15 m$\∼$29 m. In this study, ground settlements and lateral displacements of braced wall measured during installation of retaining wall and removal of bracing were specially focused to evaluate the behavior quantitatively according to three-stage-divided procedure, i.e. pre-excavation, main excavation, and removal of bracing. Through field measurements on three excavation sites, lateral displacements induced during removal of bracing are approximate to 40$\%$ of the amount found during main excavation stage and additional adjacent ground deformation during post-excavation procedure ranges from 18$\%$ to 33$\%$ of that found during main excavation stage, based on the settlement volume. In conclusion, it was quantitatively identified in this study that the deformations of adjacent ground during pre- and post-excavation stage were not negligible.

The Study on the Factors Affecting Discontinuance Intention of FinTech Payment Service: Focusing on Y University Students (핀테크 지급결제 서비스 사용중단의도 영향요인 연구: Y대학 재학생을 중심으로)

  • Chang, Eun-Jin;Hwang, Sin-Hae;Kim, Jeoung-Kun
    • Journal of Digital Convergence
    • /
    • v.20 no.3
    • /
    • pp.117-129
    • /
    • 2022
  • In the perspective of value-based adoption mode, this study empirically examined the factors that affect the intention of users of Fintech payment services to stop using them. A survey of college students who are familiar with digital devices, have no objection to payment and settlement services, and have high service access. A total of 148 questionnaires were analyzed using SPSS and SmartPLS. The study results show that perceived benefits, complexity, and security concerns are significant factors influencing the discontinue intention of Fintech payment services. Among them, the perceived benefit showed the most significant influence. Based on the results of this study, Fintech providers will be able to build a service environment to provide continuous benefits for maintaining long-term relationships with users, improve systems to secure various uses, and reduce users' negative perceptions of security. Recently, the use of services by the elderly has increased, so it is necessary to expand the scope of this study to target various age groups in future research.