• Title/Summary/Keyword: time-history analysis method

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Seismic Performance Assessment of Atmospheric Surge Tank (노출형 조압수조의 해석모델별 내진성능평가)

  • Kim, Yongon;Ok, Seung-Yong;Kim, Il Gyu;Ryu, Seonho;Bae, Jungjoo
    • Journal of the Korean Society of Safety
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    • v.31 no.5
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    • pp.67-73
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    • 2016
  • This study investigates the seismic performance of the surge tank which is of the atmospheric type and constructed above the ground. For that purpose, three different numerical models of the surge tank have been taken into account. Two models are constructed to describe the surge tank with different support conditions: one is to model all supports as fixed, and the other is to use spring element for the rock conditions. The third model is constructed to describe not only the surge tank with spring element of the rocks but also the vertical waterway tunnel. Through the time-history analysis of the surge tank subjected to three artificially excited ground motions, it is demonstrated that there can be much difference between the three models of our interest according to the support conditions and inclusion of the vertical waterway tunnel. However, their seismic performances still remain below the safety criteria, i.e., dynamic allowable stress. Also, the numerical results let us know where the critical sections occur. These results could be used to develop the efficient seismic enhancement method for the surge tank.

A Study on the Characteristics of the System of the US Health Care Facility Guidelines (미국 보건의료시설 가이드라인의 체계 특성 연구)

  • Lee, Seung Ji;Kim, Mi Ae
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.25 no.4
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    • pp.37-45
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    • 2019
  • Purpose: At the time of consensus on the necessity of appropriate guidelines for health care facilities suitable for Korea, the paper aimed to analyze the characteristics in the aspect of the system of the US Health Care Facility Guidelines(FGI Guidelines) and to suggest implications. Since the system is significant for the guidelines to be socially accepted and operated, this study focuses on the system. Methods: Literature studies focusing on the analysis of prior studies and the 2018 edition of the FGI Guidelines were conducted. Results: As a result of reviewing the history and outline of the FGI Guidelines, the derived characteristics of the system were governance, procedure, and composition. First, it had multi-layered organization and multidisciplinary members. Secondly, the focus is on the procedure of gathering opinions from industry and the public. Third, the Guidelines have been continuously evolving to reflect the needs of the times and changes in the medical environment, and the content framework and method of writing are user-friendly in order to prevent confusion caused by vast contents. Implications: First, we need to consider the composition of a private organization to prepare Korean health care facility guidelines. Second, it needs a system that can induce the participation of multidisciplinary experts. Third, a comprehensive and user friendly guideline needs to be constructed.

Ultrasonographic Guidance in Acute Achilles Tendon Rupture (급성 아킬레스 건 파열에서의 초음파 이용)

  • Lee, Tae-Hoon;Lee, Hee-Dong;Kim, Hak-Jun
    • The Journal of Korean Orthopaedic Ultrasound Society
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    • v.8 no.1
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    • pp.26-30
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    • 2015
  • There are many traumatic foot and ankle problems in orthopaedic fields. Though it is not life-threatening problems, a delay in accurate diagnosis and treatments can danger limb function and therefore correct diagnosis can prevent long-term complications. Achilles tendon rupture is relatively common injury for active sports people. Ultrasonography is cost-effective, irradiation -free, effective for evaluation of soft tissues and dynamic analysis. It has been growing importance in Achilles tendon rupture. Ultrasonography is a diagnostic tool in Achilles tendon rupture. Physical examination and patient history is needed to diagnose Achilles tendon without image, but it is missed up by 20% in private clinic. Discontinuity of normal fibrillar architecture seen on an ultrasonographic image is diagnostic for Achilles tendon rupture, and can be accentuated by the performance of dorsi-flexion and plantar flexion, while observing in real time. And ultrasonography is a reliable method for serial observation after surgical treatment or conservative treatment.

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Analysis of added resistance and seakeeping responses in head sea conditions for low-speed full ships using URANS approach

  • Kim, Yoo-Chul;Kim, Kwang-Soo;Kim, Jin;Kim, Yoonsik;Park, Il-Ryong;Jang, Young-Hun
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.9 no.6
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    • pp.641-654
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    • 2017
  • The KVLCC2 and its modified hull form were investigated in regular head waves using Unsteady Reynolds Averaged Navier-Stokes (URANS) methods. The modified KVLCC2 (named KWP-bow KVLCC2) is designed for reducing wave reflection from the bow. Firstly, the original KVLCC2 is studied for verification of the present code and methodology and the computed time history of total resistance and 2DOF motions (heave and pitch) for the selected two wave length conditions are directly compared with the results obtained from KRISO towing tank experiment under the identical condition. The predicted added resistance, heave and pitch motion RAOs show relatively good agreement with the experimental results. Secondly, the comparison of performance in waves between KVLCC2 and KWP-bow KVLCC2 is carried out. We confirmed that newly designed hull form shows better performances in all the range of wave length conditions through both the computation and the experiment. The present URANS method can capture the difference of performance in waves of the two hull forms without any special treatment for short wave length conditions. It can be identified that KWP-bow KVLCC2 gives about 8% of energy saving in sea state 5 condition.

Effect of Xeroderma Pigmentosum Complementation Group F Polymorphisms on Gastric Cancer Risk and Associations with H.pylori Infection

  • Zhang, Ji-Shun;Zhang, Chuan;Yan, Xue-Yan;Yuan, Zhi-Fang;Duan, Zhuo-Yang;Gao, Hui
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.3
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    • pp.1847-1850
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    • 2013
  • We conducted a hospital case-control study by genotyping four potential functional single nucleotide polymorphisms (SNPs) to assess the association of Xeroderma pigmentosum complementation group F (XPF) with gastric cancer susceptibility, and role of XPF polymorphisms in combination with H.pylori infection in risk definition. A total of 331 patients with gastric cancer and 355 controls were collected. Four SNPs of XPF, rs180067, rs1799801, rs2276466 and rs744154, were genotyped by Taqman real-time PCR method with a 7900 HT sequence detector system. The gastric cancer patients were more likely to have smoking habit, a family history of cancer and H.pylori infection. We did not find any significant difference in the genotype distributions of XPF rs180067, rs1799801, rs2276466 and rs744154 between cases and controls. However, multivariate logistic analysis showed a non-significant decreased risk in patients carrying rs180067 G allele, rs1799801 T allele or rs2276466 T allele genotypes. A non-significant increased risk of gastric cancer was found in individuals carrying the rs744154 GG genotype. Stratification by H.pylori infection and smoking was not significantly different in polymorphisms of XPF rs180067, rs1799801, rs2276466 and rs744154. The four XPF SNPs did not show significant interaction with H.pylori infection and smoking status (P for interaction was 0.35 and 0.18, respectively). Our study indicated that polymorphisms in rs180067, rs1799801, rs2276466 and rs744154 may affect the risk of gastric cancer but further large sample size studies are needed to validate any association.

The characteristics of types and annual trends of pop-up fashion stores - Focused on domestic cases - (패션 팝업 스토어의 연도별 변화 추이 및 유형 특성 - 국내 사례를 중심으로 -)

  • Yu, Jihun;Choi, Doree
    • The Research Journal of the Costume Culture
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    • v.23 no.5
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    • pp.822-834
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    • 2015
  • Contemporary fashion companies have been planning marketing strategies that can promote brands and products more effectively for satisfying consumers' increasingly diversified needs. For this reason, retail spaces have continued to evolve and the modern concept of pop-up stores appeared through this process. Therefore, the object of this study was to research domestic pop-up fashion store cases by collecting article data. These data are from Internet fashion-specialty sites and analyze the types and characteristics of pop-up fashion stores by providing basic information that will be useful in the pop-up fashion stores of companies when they establish their marketing strategies. This study utilized the content analysis method and derived the results by using SPSS Statistics. As a result of this study, the type of "pop-up fashion stores opening in distribution enterprises" comprised the highest percentage of the whole store types and the pop-up fashion stores' management purposes were focused on product introduction, promotion, and market testing. As time passed, not only did pop-up fashion stores' growth rate increased, but also the types of pop-up fashion stores have become more diverse. In other words, contemporary fashion companies are utilizing more pop-up fashion stores as a marketing strategy than before. However, due to the short history of domestic pop-up fashion stores, the variety of research is still insufficient, so more extensive research on pop-up fashion stores is required.

Properties of the Twenty-seven Pulses in DongUiBoGam Based on the Eight Important Pulses (팔요맥을 중심으로 살펴본 『동의보감』 27맥 속성 연구)

  • Lee, Taehyung;Jung, Won-Mo;Go, Byeongho;Park, Hi-Joon;Kim, Namil;Chae, Younbyoung
    • Korean Journal of Acupuncture
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    • v.32 no.4
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    • pp.151-159
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    • 2015
  • Objectives : Pulse diagnosis is considered particularly important among several methods of diagnosis in DongUiBoGam. In spite of its importance, numerous and various pulse descriptions made it difficult to learn and practice pulse diagnosis. In this article, we tried to analyze properties of the twenty-seven pulses from pulse diagnosis cases from DongUiBoGam to enable the practical understanding of pulse diagnosis. Methods : We constituted the four axis according to the eight important pulses. And we analyzed properties of the twenty-seven pulses through the relationship between the four pairs of important pulses and the twenty-seven pulses. To quantify the relevances of important pulses to the twenty-seven pulses, we used the term frequency-inverse document frequency(TF-IDF) method. Results : We could elicit properties of the twenty-seven pulses according to the four axis. Also, we reexamined the categorization of the seven exterior pulses / the eight interior pulses and the similar pulses from DongUiBoGam with the analysis results. Conclusions : We could understand properties of the twenty-seven pulses more specifically with the eight important pulses. And we also could see the relationship among the twenty-seven pulses on each axis. However, the limitation arising from insufficient number of pulse diagnosis cases in this research requires further research with more sources such as other traditional medical records or clinical records in the present time.

The effects of foundation size on the seismic performance of buildings considering the soil-foundation-structure interaction

  • Nguyen, Quoc Van;Fatahi, Behzad;Hokmabadi, Aslan S.
    • Structural Engineering and Mechanics
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    • v.58 no.6
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    • pp.1045-1075
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    • 2016
  • Shallow footings are one of the most common types of foundations used to support mid-rise buildings in high risk seismic zones. Recent findings have revealed that the dynamic interaction between the soil, foundation, and the superstructure can influence the seismic response of the building during earthquakes. Accordingly, the properties of a foundation can alter the dynamic characteristics (natural frequency and damping) of the soil-foundation-structure system. In this paper the influence that shallow foundations have on the seismic response of a mid-rise moment resisting building is investigated. For this purpose, a fifteen storey moment resisting frame sitting on shallow footings with different sizes was simulated numerically using ABAQUS software. By adopting a direct calculation method, the numerical model can perform a fully nonlinear time history dynamic analysis to realistically simulate the dynamic behaviour of soil, foundation, and structure under seismic excitations. This three-dimensional numerical model accounts for the nonlinear behaviour of the soil medium and structural elements. Infinite boundary conditions were assigned to the numerical model to simulate free field boundaries, and appropriate contact elements capable of modelling sliding and separation between the foundation and soil elements are also considered. The influence of foundation size on the natural frequency of the system and structural response spectrum was also studied. The numerical results for cases of soil-foundation-structure systems with different sized foundations and fixed base conditions (excluding soil-foundation-structure interaction) in terms of lateral deformations, inter-storey drifts, rocking, and shear force distribution of the structure were then compared. Due to natural period lengthening, there was a significant reduction in the base shears when the size of the foundation was reduced. It was concluded that the size of a shallow foundation influences the dynamic characteristics and the seismic response of the building due to interaction between the soil, foundation, and structure, and therefore design engineer should carefully consider these parameters in order to ensure a safe and cost effective seismic design.

Perceptions of Iranian Cancer Patients Regarding Respecting their Dignity in Hospital Settings

  • Avestan, Zoleikha;Rahmani, Azad;Heshmati-Nabavi, Fatemeh;Mogadasian, Sima;Faghani, Safieh;Azadi, Arman;Esfahani, Ali
    • Asian Pacific Journal of Cancer Prevention
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    • v.16 no.13
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    • pp.5453-5458
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    • 2015
  • Background: There are several factors that threaten the dignity of cancer patients in hospital settings. However, there is limited literature regarding the degree to which dignity of cancer patients is actually respected in daily clinical practice. The aims of this study were therefore to explore cancer patient perceptions of respecting their dignity and related variables in an Iranian cancer specific center. Materials and Methods: This descriptive-correlational study was carried out among 250 cancer patients admitted to a cancer specific center in East Azerbaijan Province, Iran. These patients were selected using a convenience sampling method. The Patient Dignity Inventory (PDI) was used for data collection. Descriptive and inferential statistics were used for data analysis. Results: The patients' scores in 18 out of 25 items of PDI were 3 or greater which indicate the importance of considering these items in clinical settings. Also, the score of patients in three sub-scales of PDI including illness-related concerns, personal dignity, and social dignity were 74, 65 and 57, respectively (based on a total 100). The overall score of PDI was statistically associated with age, history of disease recurrence, education, employment and economic status of participants. Conclusions: According to the study findings the dignity of Iranian cancer patients is not completely respected in clinical settings which require special considerations. As nurses spend more time at patients' bedsides, they have an important role in maintaining and promoting dignified care.

Mechanical characteristics + differential settlement of CFG pile and cement-soil compacted pile about composite foundation under train load

  • Cheng, Xuansheng;Liu, Gongning;Gong, Lijun;Zhou, Xinhai;Shi, Baozhen
    • Geomechanics and Engineering
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    • v.20 no.2
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    • pp.155-164
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    • 2020
  • In recent years, the stability, safety and comfort of trains has received increased attention. The mechanical characteristics and differential settlement of the foundation are the main problems studied in high-speed railway research. The mechanical characteristics and differential settlement of the foundation are greatly affected by the ground treatment. Additionally, the effects of train load and earthquakes have a great impact. The dynamic action of the train will increase the vibration acceleration of the foundation and increase the cumulative deformation, and the earthquake action will affect the stability of the substructure. Earthquakes have an important practical significance for the dynamic analysis of the railway operation stage; therefore, considering the impact of earthquakes on the railway substructure stability has engineering significance. In this paper, finite element model of the CFG (Cement Fly-ash Gravel) pile + cement-soil compacted pile about composite foundation is established, and manual numerical incentive method is selected as the simulation principle. The mechanical characteristics and differential settlement of CFG pile + cement-soil compacted pile about composite foundation under train load are studied. The results show: under the train load, the neutral point of the side friction about CFG pile is located at nearly 7/8 of the pile length; the vertical dynamic stress-time history curves of the cement-soil compacted pile, CFG pile and soil between piles are all regular serrated shape, the vertical dynamic stress of CFG pile changes greatly, but the vertical dynamic stress of cement-soil compacted pile and soil between piles does not change much; the vertical displacement of CFG pile, cement-soil compacted pile and soil between piles change very little.