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Experimental Study of Motion Behavior of Side-by-Side Moored Two Floating Bodies Including Sloshing in Head Sea (선수파 중 슬로싱을 고려한 병렬배치된 두 부유체의 거동 특성에 관한 실험 연구)

  • Cho, Seok-Kyu;Sung, Hong-Gun;Hong, Jang-Pyo;Hong, Sa-Young;Hong, Seok-Won
    • Journal of Ocean Engineering and Technology
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    • v.26 no.6
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    • pp.46-52
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    • 2012
  • The motions and drift forces of side-by-side moored FSRU and LNGC including the sloshing effect, were studied using experiments. The FSRU and LNGC contained LNG cargo tanks and the LNG sloshing could affect the motions and drift forces of the structures due to its coupling with floating body motion. The effect of coupling can vary with the LNG filling level, and the effect of the filling level was investigated. The coupling effect was stronger at lower filling level. It was confirmed that longitudinal sloshing influenced the surge and surge mean drift force in head sea. In addition, gap flow affected the sway and mean drift forces. Sloshing attenuated the sway and yaw excited by gap flow in side-by-side configuration.

The Remodeling Characteristics of Various Types of Secondary Kitchen in Apartment House (아파트 보조부엌의 유형별 개조특성에 관한 연구)

  • Lee, Joo-Hee;Oh, Chan-Ohk;Yang, Se-Hwa
    • Journal of the Korean housing association
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    • v.18 no.2
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    • pp.65-74
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    • 2007
  • The study analyzes the remodeling characteristics of the four different types of secondary kitchens in apartment house based on their floor plans. The secondary kitchens are categorized into side placement, back placement, back placement with extensions on both sides, and back placement with an extension on a single side. The twelve apartment complexes in Ulsan were selected so that they may all consist each of the four types, and answered the survey. The classified traits of secondary kitchen were examined based on the characteristics of floor plan and remodeling. Side placement and back placement with extensions on both sides mostly used glass hinged doors. Back placement and back placement with a single side extension used glass sliding doors. It was found that the majority of the floor materials consisted of both wood and tiles, except for side placements, where only tiles were used. The sizes of the back placements with both and single side extensions were the largest. The side and back placements were rarely renovated, however, back placements with both and single side extensions went through massive remodeling.

Experimental investigation of inelastic buckling of built-up steel columns

  • Hawileh, Rami A.;Abed, Farid;Abu-Obeidah, Adi S.;Abdalla, Jamal A.
    • Steel and Composite Structures
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    • v.13 no.3
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    • pp.295-308
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    • 2012
  • This paper experimentally investigated the buckling capacity of built-up steel columns mainly, Cruciform Columns (CC) and Side-to-Side (SS) columns fabricated from two Universal Beam (UB) sections. A series of nine experimental tests comprised of three UB sections, three CC sections and three SS sections with different lengths were tested to failure to measure the ultimate axial capacity of each column section. The lengths used for each category of columns were 1.8, 2.0, and 2.2 m with slenderness ratios ranging from 39-105. The measured buckling loads of the tested specimens were compared with the predicted ultimate axial capacity using Eurocode 3, AISC LRFD, and BS 5959-1. It was observed that the failure modes of the specimens included flexural buckling, local buckling and flexural-torsional buckling. The results showed that the ultimate axial capacity of the tested cruciform and side-by-side columns were higher than the code predicted design values by up to 20%, with AISC LRFD design values being the least conservative and the Eurocode 3 design values being the most conservative. This study has concluded that cruciform column and side-to-side welded flange columns using universal beam sections are efficient built-up sections that have larger ultimate axial load capacity, larger stiffness with saving in the weight of steel used compared to its equivalent universal beam counterpart.

Radiographic study of mandibular asymmetry (하악 비대칭의 방사선학적 연구)

  • Jeong Yeon-Hwa;Cho Bong-Hae
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.28 no.1
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    • pp.193-204
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    • 1998
  • The purpose of this study was to perform the radiographic measurements and temporomandibular joint evaluation in mandibular asymmetry. For this study, thirty-two patients who have mandibular asymmetry were selected and submentovertex, panoramic and lateral corrected tomographic radiographs were taken. Horizontal and vertical analysis using various landmarks on these radiographs were performed. Also radiographic and clinical evaluation of temporomandibular joint were obtained. The results were as follows ; 1. On the submentovertex radiograph, the mean distance of Pogonion to midline was 5.0±3.8mm. 2. The mean distance of Pogonion to Gonion was 100.6±9.2mm in deviated side and 104.3±9.1mm in contra-lateral side, and there was a significant difference between the deviated and the contra-lateral side (p<0.001). 3. The distance difference of Pogonion to Gonion between the deviated and the contra-lateral side was significantly related to the degree of asymmetry (p<0.001). 4. On panoramic radiograph, the condylar height of the contra-lateral side was significantly longer than the one of the deviated side(p<0.001). 5. On lateral corrected tomogram, bony changes of temporomandibular joint were observed in 11 condyles of the deviated side and 9 condyles of the contra-lateral side. Erosion and osteophyte were the most common changes in both the deviated and the contra-lateral sides.

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Flow Characteristics of a Side-Weir in Rectangular Channel (구형 수로내 횡월류 흐름의 특성)

  • Park, Tae-Seon
    • Journal of Korea Water Resources Association
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    • v.35 no.3
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    • pp.251-259
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    • 2002
  • Flow characteristics occurring a side-weir overflow in rectangular channel is investigated in this study. A numerical model based on the two -dimensional shallow-water equations is employed to review the factors influencing on the side- weir overflow discharge and the change of flow depths and velocities. It is found that the discharge coefficient which has the most significant influence on the overflow is affected by geometric characteristics of a side-weir, Froude number of the main channel flow and the flow depth of the main channel at the starting point of a side-weir. And the discharge coefficient applicable to a practical design of a side-weir is proposed by deriving a relationship between Froude number of the main channel flow at the starting point of a side-weir and Froude number of the main channel flow.

Effect of splinting on abutment tooth movement when a distal extension partial denture used(II) (유리단국부의치(遊離端局部義齒) 사용시(使用時) 지태치(支台齒) 동요(動搖)에 대한 Splingting의 효과(效果)(II))

  • Jung, Jong-Hyun
    • Journal of Technologic Dentistry
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    • v.8 no.1
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    • pp.85-90
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    • 1986
  • The effect of splinting on aqbutment tooth distal movement was performed in vitro study. An acrylic resin mandibular model with missing 2nd premolars, molars and a removable partial denture framework were constructed. The roots of the canines, 1st premolars and edentulous ridges were coated with silicone rubber. A modified Ney Surveyor was used for vertical load appkication, and abutment tooth distal movement were measured with a dial gauge with four conditions of splinting methods were tested by applying unilateral vertical loadings. The results are follows; 1. The magnitude of abutment tooth distal movement on the non-load side was less 40$\sim$69% than that occurred on the load side. 2. On the load side, reducing effect of splinting on abutment tooth movement in the condition of load side double abutment(30%), non-load side double abutment(10%), double abutments of both sides(40%) was compared with single abutments of both sides. 3. On the non-load side, reducing effect of splinting on abutment tooth movement in the condition of load side double abutment(5%), non-load side double abutment(22%), double abutments of both sides(59%) was compared with single abutments of both sides. 4. The magnitude of abutment tooth distal movement in the condition of double abutments of both sides was less 40$\sim$59% than that in the condition of single abutments of both sides.

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Effect of Paretic Side and Non-paretic Side Arm Training on Trunk Control and Upper Limb Functions in Stroke Patients

  • Kim, Teahyun;Son, Yuhyeon;Park, Shinjun
    • Journal of International Academy of Physical Therapy Research
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    • v.10 no.1
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    • pp.1734-1738
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    • 2019
  • Background: Stroke patients usually have arm weakness, which affects trunks and arms. Objective: To investigate the effects of paretic side and non-paretic side arm training on trunk control and upper limb functions. Design: Randomized Controlled Trial (single blind). Methods: Twenty patients with stroke in hospital were enrolled in the study. Twenty subjects were randomly assigned to paretic side arm training group (PATG, n = 10) or non-paretic side arm training group (NATG, n = 10). Trunk impairment scale (TIS) was used for trunk control, and box and block test (BBT) was used for upper limb function. Training was conducted for 4 weeks. Results: PATG showed significant difference in TIS (static balance, dynamic balance, coordination, total score) and BBT. NATG showed significant differences in static balance, and dynamic balance and total score except for coordination and BBT. PATG also showed a more significant difference in BBT and coordination and total score than NATG. Conclusions: The arm training performed on the paretic side are more effective than those performed on the non-paretic side in improving both upper limb function and trunk control in stroke patients.

Forces and flow around three side-by-side square cylinders

  • Zheng, Qinmin;Alam, Md. Mahbub;Rehman, S.;Maiti, D.K.
    • Wind and Structures
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    • v.29 no.1
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    • pp.1-13
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    • 2019
  • A numerical investigation on forces and flow around three square cylinders in side-by-side arrangement is conducted at a Reynolds number Re = 150 with the cylinder center-to-center spacing ratio L/W = 1.1 ~ 9.0, where W is the cylinder side width. The flowat this Re is assumed to be two-dimensional, incompressible, and Newtonian. The flow simulation is conducted by using ANSYS-Fluent. The flow around the three side-by-side cylinders entails some novel flow physics, involving the interaction between the gap and free-stream side flows as well as that between the two gap flows. An increase in L/W from 1.1 to 9.0 leads to five distinct flow regimes, viz., base-bleed flow (L/W < 1.4), flip-flopping flow (1.4 < L/W < 2.1), symmetrically biased beat flow (2.1 < L/W < 2.6), non-biased beat flow (2.6 < L/W < 7.25) and weak interaction flow (7.25 < L/W < 9.0). The gap flow behaviors, time-averaged and fluctuating fluid forces, time-averaged pressure, recirculation bubble, formation length, and wake width in each flow regime are discussed in detail.

Aerodynamic modification of setback distance at half height of the tall building to minimize the wind effect

  • Bairagi, Amlan Kumar;Dalui, Sujit Kumar
    • Wind and Structures
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    • v.35 no.3
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    • pp.193-211
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    • 2022
  • The present study focuses on aerodynamic parameters behaviors and control on the single and double side setback building models at the buildings mid-height. The study is conducted by computational fluid dynamics (CFD) simulation. This study estimates the face wise pressure coefficient on single side setback buildings with a setback range of 20%-50% and double side setback buildings with setbacks ranging from 10%-25%. The polynomial fitted graphs from CFD data predict the Cp on different setback model faces within permissible limit ±13% error. The efficient model obtained according to the minimum drag, lift, and moment consideration for along and across wind conditions. The study guides the building tributary area doesn't control the drag, lift, and moment on setback type buildings. The setback distance takes a crucial role in that. The 20% double side setback model is highly efficient to regulate the moment for both along and across wind conditions. It reduces 17.5% compared to the 20% single side setback and 14% moment compared to the 10% double side setback models. The double side setback building is more efficient to control 4.2% moment than the single side setback building

Study on Characteristics of Flow-Induced Vibrations of Two Circular Cylinders (두 원기둥의 유동에 기인한 진동 특성에 관한 연구)

  • Kim, Sang Il;Lee, Seung Chul
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.4
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    • pp.359-366
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    • 2013
  • This study aims to investigate the characteristics of the flow-induced vibrations of two circular cylinders. The characteristics of the flow-induced vibrations are examined for various flow velocities and spaces between the two cylinders when they are arranged in tandem, staggered, and side-by-side positions. The results are as follows: (i) Seven flow-induced vibration patterns are observed when the two circular cylinders are placed in either tandem, staggered, or side-by-side positions. (ii) The two cylinders induce a vibration because they affect each other. (iii) The easiest way to induce a vibration of the two cylinders is by placing them in the side-by-side position among the three arrangements (tandem, staggered, and side-by-side). (iv) The change in the maximum flow-induced vibration of the two cylinders depends strongly on the fluctuating lift forces of each of them.