• Title, Summary, Keyword: TRC

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A study on hydraulic back analysis for an urban tunnel site and stability analysis based on hydro-mechanical coupling analysis (도심지 터널 용출수 발생구간에서의 수리 역해석 및 수리-역학 연계해석을 통한 안정성 해석 연구)

  • Park, Inn-Joon;Song, Myung-Gyu;Shin, Uyu-Soung;Park, Yong-Su
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.10 no.4
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    • pp.397-404
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    • 2008
  • Excessive amount of groundwater flowed into tunnel, while constructing Incheon international airport railway. Tunnel passes under subway line no. 2 with only 1.76 m below. To protect the existing structure, TRcM excavation method was applied. As station and construction shaft are already constructed, which are located back and forth of TRcM section, 86.4 ton per day of groundwater inflow is against expectation. To identify mechanism of excessive water inflow, hydraulic back analyses were performed. Then, hydro-mechanical coupled analysis were also performed with the hydrogeologic parameters identified, whose results are investigated for checking the stability of adjacent structures to the tunnel under construction. And a number of mechanical analyses were also performed to check the hydro-mechanical coupling effect. The result from the mechanical analysis shows that subsidence and tunnel ceiling displacement will be 0.85 mm and 1.32 mm. The result of hydro-mechanical couple analysis shows that subsidence and maximum tunnel ceiling displacement will be 1.2 mm and 1.72 mm. Additional displacements caused by groundwater draw down were identified, however, displacement is minute.

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The Performance Analysis of TRC Dropper to improve fairness on DiffServ Networks (DiffServ 네트워크에서 공평성 향상을 위한 TRC Dropper의 성능 분석)

  • Kim, Hoon-Ki;Hong, Sung-Hwa
    • Journal of the Korea Society for Simulation
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    • v.18 no.3
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    • pp.91-102
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    • 2009
  • The average window size is most closely related to average throughput. In order to improve fairness, the proposed dropper tries to control the window size of each flow to equal level by intentional packet drop. Intentional packet drop is performed only to the flows that have been occupied bandwidth in a large amount. Because of intentional packet drop, this flow cut down its transmission rate to a half. Accordingly, somewhat capacity of core link comes into existence. And other flow can use this new capacity of this link. Hence other flows have more throughput than before. In this paper, we propose the TRC (Transmission Rate Control) Dropper improving the fairness between individual flows of aggregated sources on DiffServ network. It has the fairness improvement mechanism mentioned above paragraph.

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Connections between RC beam and square tubed-RC column under axial compression: Experiments

  • Zhou, Xu-Hong;Li, Bin-Yang;Gan, Dan;Liu, Jie-Peng;Chen, Y. Frank
    • Steel and Composite Structures
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    • v.23 no.4
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    • pp.453-464
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    • 2017
  • The square tubed-reinforced concrete (TRC) column is a kind of special concrete-filled steel tube (CFST) columns, in which the outer thin-walled steel tube does not pass through the beam-column joint, so that the longitudinal steel reinforcing bars in the RC beam are continuous through the connection zone. However, there is a possible decrease of the axial bearing capacity at the TRC column to RC beam connection due to the discontinuity of the column tube, which is a concern to engineers. 24 connections and 7 square TRC columns were tested under axial compression. The primary parameters considered in the tests are: (1) connection location (corner, exterior and interior); (2) dimensions of RC beam cross section; (3) RC beam type (with or without horizontal haunches); (4) tube type (with or without stiffening ribs). The test results show that all specimens have relatively high load-carrying capacity and satisfactory ductility. With a proper design, the connections exhibit higher axial resistance and better ductility performance than the TRC column. The feasibility of this type of connections is verified.

INDUCTION OF APOPTOSIS IN TESTIS OF SD RATS AFTER EXPOSURE 2-BROMOPROPANE

  • Kim, Young-Hee;Cho, Sung-Whan;Ha, Chang-Su;Kang, Boo-Hyon
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.120-120
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    • 2001
  • Exposure of testis to 2-BP is known to cause degeneration of male germ cells. However, the mechanism underlying this process is poorly understood. The objective of this study was to determine whether 2-BP induces apoptosis during onset of toxicity in germ cells of male Sprague-Dawley rats.(omitted)

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Noise Automatic Gain Control to Stabilize Radar Performance (레이더 성능 안정화를 위한 잡음 AGC)

  • Shin, Hyun-Ik;Choi, Beyung-Gwan;Jang, Youn-Hhi;Kim, Jeong-Ryul;Kim, Whan-Woo
    • Proceedings of the IEEK Conference
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    • pp.227-228
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    • 2007
  • The dynamic range of the radar which uses digital signal processors is limited by ADC(analog- to-digital converter). This parameter and ADC loss depend on the noise level of radar receivers. In order to stabilize the performance of radar systems, it is necessary to maintain the noise level constantly. This paper presents a noise AGC(automatic gain control) concept that can keep the noise level constantly and proves that the concept is acceptable through evaluation and hardware test.

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Evaluation of Delhi Population Based Cancer Registry and Trends of Tobacco Related Cancers

  • Yadav, Rajesh;Garg, Renu;Manoharan, N;Swasticharan, L;Julka, PK;Rath, GK
    • Asian Pacific Journal of Cancer Prevention
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    • v.17 no.6
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    • pp.2841-2846
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    • 2016
  • Background: Tobacco use is the single most important preventable risk factor for cancer. Surveillance of tobacco-related cancers (TRC) is critical for monitoring trends and evaluating tobacco control programmes. We analysed the trends of TRC and evaluated the population-based cancer registry (PBCR) in Delhi for simplicity, comparability, validity, timeliness and representativeness. Materials and Methods: We interviewed key informants, observed registry processes and analysed the PBCR dataset for the period 1988-2009 using the 2009 TRC definition of the International Agency for Research on Cancer. We calculated the percentages of morphologically verified cancers, death certificate-only (DCO) cases, missing values of key variables and the time between cancer diagnosis and registration or publication for the year 2009. Results: The number of new cancer cases increased from 5,854 to 15,244 (160%) during 1988-2009. TRC constituted 58% of all cancers among men and 47% among women in 2009. The age-adjusted incidence rates of TRC per 100,000 population increased from 64.2 to 97.3 among men, and from 66.2 to 69.2 among women during 1988-2009. Data on all cancer cases presenting at all major government and private health facilities are actively collected by the PBCR staff using standard paper-based forms. Data abstraction and coding is conducted manually following ICD-10 classifications. Eighty per cent of cases were morphologically verified and 1% were identified by death certificate only. Less than 1% of key variables had missing values. The median time to registration and publishing was 13 and 32 months, respectively. Conclusions: The burden of TRC in Delhi is high and increasing. The Delhi PBCR is well organized and generates high-quality, representative data. However, data could be published earlier if paper-based data are replaced by electronic data abstraction.

Anti-inflammatory effect of new calcium hydroxide paste containing silicon-substituted hydroxyapatite in lipopolysaccharide-stimulated macrophages

  • Roh, Ji-Yeon;Kim, Ki-Rim
    • Journal of Korean society of Dental Hygiene
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    • v.18 no.4
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    • pp.423-432
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    • 2018
  • Objectives: Calcium hydroxide, a root canal temporary sealer, has long been used and it has anti-bacterial and anti-inflammatory activity. To investigate the properties of a newly developed calcium hydroxide paste comprising silicon-substituted hydroxyapatite (Si-HA), we examined the anti-inflammatory activity of the new calcium hydroxide paste in RAW 264.7 macrophages stimulated by lipopolysaccharide (LPS), which causes infection of the root canal. Methods: The test materials, including Calcipex II as control group and the newly developed TRC paste, were extracted from cell culture media and then diluted for experiment. In LPS-stimulated RAW 264.7 cells, the cytotoxicity and nitric oxide (NO) production of test materials were measured by MTT assay and Griess reagents, respectively. Also, the expression of the inducible nitric oxide synthase (iNOS) was assessed by western blotting. Results: The IC50 values of Calcipex II and TRC paste were $17.6mg/m{\ell}$ and $13.5mg/m{\ell}$, respectively. The level of NO, increased by LPS, was dose-dependently inhibited more by TRC paste than Calcipex II treatment. In addition, iNOS expression was decreased by 71% and 92% at concentrations of $2mg/m{\ell}$ and $20mg/m{\ell}$ of TRC paste, respectively. Conclusions: We demonstrated that the Si-HA calcium hydroxide paste has a slightly improved anti-inflammatory property and further studies are needed before clinical recommendations are proposed.

A study of signal control with COSMOS on National Highway (신신호시스템(COSMOS)의 일반국도 적용에 대한 연구)

  • Baek Hyon-Su;Kim Young-Chan;Moon Hak-Yong;Kim Jong-Sik
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.3 no.2
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    • pp.29-40
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    • 2004
  • The performance of the National Highway is raised, but the capacity of the signalized intersection on the National Highway is low. It's operated by TOD(Time Of Day) mode. To evaluate of the performance of COSMOS(Cycle, Offset, Split Model for Seoul), a real time traffic adaptive signal control system, on the National Highway, studied volume, travel time and queuing length at TOD control and TRC(Traffic responsive Control). Consequently, the average travel speed at TRC is high $2.9\~16.7$km/h then the average travel speed at TOD control. And te queuing length at TRC is low $15\~196m$ then the queuing length at TOD control.

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Energy-Efficient Base Station Operation in Heterogeneous Cellular Networks

  • Nguyen, Hoang-Hiep;Pham, Ngoc-Thai;Hwang, Won-Joo
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.158-159
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    • 2012
  • Heterogeneous cellular networks can provide high throughput and coverage compare to conventional networks of only macrocell deployment, however it operates regardless of total power consumption, which is a very important issue of modern cellular networks. We propose a policy that control the on/off state of base stations in heterogeneous networks according daily traffic profile. Under this policy, the total power consumed can be significantly reduced when the traffic is low while preserving QoS requirement.

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