• Title/Summary/Keyword: Proportionality

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A Comparative Study on the Prediction of the Final Settlement Using Preexistence Method and ARIMA Method (기존기법과 ARIMA기법을 활용한 최종 침하량 예측에 관한 비교 연구)

  • Kang, Seyeon
    • Journal of the Korean GEO-environmental Society
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    • v.20 no.10
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    • pp.29-38
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    • 2019
  • In stability and settlement management of soft ground, the settlement prediction technology has been continuously developed and used to reduce construction cost and confirm the exact land use time. However, the preexistence prediction methods such as hyperbolic method, Asaoka method and Hoshino method are difficult to predict the settlement accurately at the beginning of consolidation because the accurate settlement prediction is possible only after many measurement periods have passed. It is judged as the reason for estimating the future settlement through the proportionality assumption of the slope which the preexistence prediction method computes from the settlement curve. In this study, ARIMA technique is introduced among time series analysis techniques and compared with preexistence prediction methods. ARIMA method was predictable without any distinction of ground conditions, and the results similar to the existing method are predicted early (final settlement).

A Comparative Study of the Kiwarisho and Korea Material Proportion - about palace of building frame in three-bay Buddhist halls - (일본 키와리쇼와 한국의 부재비례 비교연구 - 3칸불당의 축부를 중심으로 -)

  • Kim, Byung-jin
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.34 no.8
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    • pp.59-67
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    • 2018
  • In a state where ancient buildings was left a lot in the case of Korea, many parts do not remain the documentation, and there is a Kiwarisho lot in Japan, however, the present methods and tree split does not exist in the Korea. However, it is impossible to make a perfect building without splitting exact member when making a building. Thus will not be revealed simply by presumption that there is a similar way to wood comparatively far in Korea. Without a comparison of building dimensions and Korea calculation dimensions Kiwarisho In the first study about the proportionality of Korea, I do not know until now, other studies of the following documents which house a high approximation ratio and member size of Korea consider reason to have is impossible. View compared with respect to the axis of the building in the early stages of research first. In the case of Japan and Korea to form a tree frames in basic form that form the building, the shaft portion is easy to understand and easy compared in common is at most the shaft portion.

Analysis of plane figures and their measures in 'GwangmuYangan' from the perspective of Joseon mathematics (조선 산학의 관점에서 <광무양안>에 제시된 평면도형의 측도 분석)

  • CHANG Hyewon
    • Journal for History of Mathematics
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    • v.37 no.3
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    • pp.59-75
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    • 2024
  • This study aims to analyze Joseon mathematical knowledge and its application to real world. The mathematical knowledge refers to measuring the area of plane figures, known as square-shaped land(方田). Its application is land surveys(量田) conducted for taxation purposes. Specifically, this study analyzes the correlation between the related contents in representative mathematical books of the Joseon Dynasty, such as MuksaJipsanbub (17th century), Guiljib (18th century), and SanhakIbmun (18th century), and the shapes and areas of plane figures presented in GwangmuYangan (20th century). The analysis reveals both differences and similarities in the measured area between mathematical books and real world land surveys. While most results of the land survey align with the results obtained from mathematical methods, differences arise due to variations in real measurement of lengths and given conditions in the problems. Additionally, various aspects such as the focus on rectangles in land surveys, the proportionality and relativity of lengths, types of approximation, composed shapes, the purpose of problem solving, and reasoning of unspecified shapes or measures are discussed.

Experimental study of the radiation shielding characteristics of new PbO-Na2O-B2O3-BaO glasses

  • M.I. Sayyed;U. Rilwan;K.A. Mahmoud;Mohamed Elsafi
    • Nuclear Engineering and Technology
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    • v.56 no.7
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    • pp.2437-2443
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    • 2024
  • This work synthesized four glass samples with a fixed ratio of PbO to Na2O and a variable ratio of BaO to B2O3. The linear attenuation coefficient (LAC) (μ, cm-1) and additional attenuator parameters were determined experimentally using a semiconductor detector and different gamma sources. The comparison was carried out between the experimental and the XCOM calculated results, with good agreement emerging between the two results. The impacts of the BaO substituting for the B2O3 on fabricated PNBB glasses' radiation shielding properties were discussed. By increasing the BaO substitution concentration between 10 and 25 mol.%, the LAC μ values (cm-1) increased by 76.60 %, 13.81 %, 12.56 %, and 12.52 % for the respective γ-ray energies of 0.059, 0.662, 1.173, and 1.332 MeV. The μ value reduction with raised gamma energy values increased the values of the calculated half-value thickness (Δ0.5) as a result of the μ and Δ0.5 values' reverse proportionality. Other shielding parameters such as the lead equivalent thickness (Δeq) and radiation protection efficiency were also determined for the present PNBB glass samples.

A Study on the ICSID Arbitration Cases for Fair and Equitable Treatment under International Investment Disputes - Focusing on the Protection of the Investor's Legitimate Expectations - (국제투자분쟁에서 공정·공평 대우에 관한 ICSID 중재사례 연구 - 외국인투자자의 정당한 기대 보호를 중심으로 -)

  • HWANG, Ji-Hyeon
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.71
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    • pp.195-216
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    • 2016
  • In determining the content of the FET standard, the tribunals stated protection of investor's legitimate expectations, due process and denial of justice, transparency, discrimination and arbitrariness, good faith, etc. The most major elements of the FET standard is the protection of the investor's legitimate and reasonable expectations. It is necessary to consider whether it is possible to what the expectations of investors are protected as legitimate and it is formed under any circumstances. If host state frustrate investor's legitimate expectations, it found a breach of the FET. The host state's specific assurance may reinforce investor's expectations, but such explicit statement is not always necessary. The host state must preserve a stable environment for investments. However, It must not be understood as the inalterability of the host state's legal framework. It implies that the host state's subsequent changes should be made consistently and predictably. The host state is entitled to exercise a reasonable regulatory authority to respond to changing circumstances in the public purpose. Therefore, whether the violation FET shall be determined through a balanced against the investor's legitimate expectations and the host state's reasonable regulatory exercise in the public interest. And investor should keep in mind that the principle of proportionality is applied unless host state provides stabilization clause or similar commitments to investor. Also host state should establish the basis of an argument about reasonable regulatory authority for public interest.

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Estimation of Transpiration Rate with a Metering Pump and its Application in Soilless Culture System (정량펌프를 이용한 무토양재배시스템의 증산량 추정 및 그 응용)

  • Son, Jung-Eek;Park, Jong-Seok
    • Horticultural Science & Technology
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    • v.16 no.1
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    • pp.25-26
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    • 1998
  • Nutrient supplying by a metering pump often produces the inaccuracy in the rate of inflow than expected. In this study, we developed the transpiration estimation system using the metering pump to measure the continuous supplying rate as well as to estimate the accurate transpiration rate. The system showed the stable characteristics by eliminating the fluctuations in the head loss of nutrient tank. The direct proportionality between the supplying time and the supplied nutrient solution was obtained. The exact correlation between the integrated solar radiation and the transpiration rate using the system was calculated, and correlation coefficients between the two factors were 0.98 in the NFT system and 0.92 in the aggregate system. This results suggest that the integrated solar radiation was an important factor to directly decide the supplying volume of nutrient solution in soilless culture system. The deveolped system using the metering pump in the study was able to control the supply of the nutrient solution to the crops adjusting to the variation of solar radiation.

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Controlling the surface energy and electrical properties of carbon films deposited using unbalanced facing target magnetron sputtering plasmas

  • Javid, Amjed;Kumar, Manish;Yoon, Seok Young;Lee, Jung Heon;Han, Jeon Geon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2015.08a
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    • pp.231.1-231.1
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    • 2015
  • Surface energy, being an important material parameter to control its interactions with the other surfaces plays a key role in bio-related application. Carbon films are found very promising due to their characteristics such as wear and corrosion resistant, high hardness, inert, low resistivity and biocompatibility. The present work deals with the deposition of carbon films using unbalanced facing target magnetron sputtering technique. The discharge characteristics were studied using optical emission spectroscopy and correlated with the film properties. Surface energy was investigated through contact angle measurement. The ID/IG ratio as calculated from Raman spectroscopy data increases with the increase in power density due to the higher number of sp2 clusters embedded in the amorphous matrix. The deposited films were smooth and homogeneous as observed by Atomic force microscopy having RMS roughness in the range of 1.74 to 2.25 nm. It is observed that electrical resistivity and surface energy varies in direct proportionality with operating pressure and has inverse relation with power density. The surface energy results clearly exhibited that these films can have promising applications in cell cultivation.

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The tuned mass-damper-inerter for harmonic vibrations suppression, attached mass reduction, and energy harvesting

  • Marian, Laurentiu;Giaralis, Agathoklis
    • Smart Structures and Systems
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    • v.19 no.6
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    • pp.665-678
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    • 2017
  • In this paper the tuned mass-damper-inerter (TMDI) is considered for passive vibration control and energy harvesting in harmonically excited structures. The TMDI couples the classical tuned mass-damper (TMD) with a grounded inerter: a two-terminal linear device resisting the relative acceleration of its terminals by a constant of proportionality termed inertance. In this manner, the TMD is endowed with additional inertia, beyond the one offered by the attached mass, without any substantial increase to the overall weight. Closed-form analytical expressions for optimal TMDI parameters, stiffness and damping, given attached mass and inertance are derived by application of Den Hartog's tuning approach to suppress the response amplitude of force and base-acceleration excited single-degree-of-freedom structures. It is analytically shown that the TMDI is more effective from a same mass/weight TMD to suppress vibrations close to the natural frequency of the uncontrolled structure, while it is more robust to detuning effects. Moreover, it is shown that the mass amplification effect of the inerter achieves significant weight reduction for a target/predefined level of vibration suppression in a performance-based oriented design approach compared to the classical TMD. Lastly, the potential of using the TMDI for energy harvesting is explored by substituting the dissipative damper with an electromagnetic motor and assuming that the inertance can vary through the use of a flywheel-based inerter device. It is analytically shown that by reducing the inertance, treated as a mass/inertia-related design parameter not considered in conventional TMD-based energy harvesters, the available power for electric generation increases for fixed attached mass/weight, electromechanical damping, and stiffness properties.

Estimations of Strain-Based J-integral and CTOD for Circumferential Outer Surface Crack in the Weld of Gas Pipeline Under Axial Displacement (축방향 변위가 작용하는 가스 파이프라인 용접부에 존재하는 원주방향 외부표면균열의 변형률 기반 J-적분 및 CTOD 계산)

  • Kim, Kyoung-Min;Park, Ji-Su;Moon, Ji-Hee;Jang, Youn-Young;Park, Seung-Hyun;Huh, Nam-Su
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.16 no.1
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    • pp.100-109
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    • 2020
  • Pipelines subjected to ground movement would be easily exposed to large-scale deformation. Since such deformations may cause the pipeline failure, it is important to ensure the safety of pipelines in various operation conditions. However, crack in weld metal have been considered as one of the main causes that can deteriorate the structural integrity of the pipeline. For this reason, the structural integrity of the pipe containing the crack in the weld should be obtained. In order to assess cracked pipe, J-integral and crack-tip opening displacement(CTOD) have been applied widely as the elastic-plastic fracture mechanics parameters representing crack driving force. In this study, engineering solutions to calculate the J-integral and CTOD of pipes with a circumferential outer surface crack in the weld are proposed. For this purpose, 3-dimensional elastic-plastic finite element(FE) analyses have been performed considering the effect of overmatch and width of weld. The shape of the weld was simplified to I-groove, and axial displacement was employed as for loading condition. Based on FE results, the effects of crack size, material properties and width of weldment on J-integral and CTOD were investigated. Additionally, the J-integral and CTOD for I-groove were compared with those for V-groove to examine the effects of the weld shape, and a proportionality coefficient of J-integral and CTOD was calculated from the results of this paper.

Effects of NH4F and H2O on the Geometry of TiO2 Nanotubes (TiO2 나노튜브 형상에 미치는 NH4F와 H2O의 영향)

  • Gim, Geon-Du;Jang, Sang-Soon;Kim, Heesan
    • Corrosion Science and Technology
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    • v.17 no.3
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    • pp.138-145
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    • 2018
  • The aim of this work is the attainment of the $TiO_2-nanotube$ photocatalytic-growth condition using anodization, whereby the $NH_4F-H_2O$ weight ratio is appropriately controlled. We fabricated the $TiO_2$ nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambient pressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects of the $NH_4F$(0.1,0.3,0.5wt%) and $H_2O$(1-3wt%) on the $TiO_2-nanotube$ geometry and the photocatalytic efficiency. Further, the decomposition efficiency of the methylene blue on the $TiO_2$ nanotubes by the UN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionality of the decomposition efficiency to the surface area that was affected by the $NH_4F$ and $H_2O$ concentrations. As the $NH_4F$ weight was increased, the surface area initially decreased but slightly increased later, and the length consistently increased. As the $H_2O$ weight was increased, the surface area and length initially increased, but later decreased with the 3 wt% $H_2O$.