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A Combined Bulk Electric System Reliability Framework Using Adequacy and Static Security Indices

  • Billinton, Roy;Wangdee, Wijarn
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.414-422
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    • 2006
  • Deterministic techniques have been applied in power system planning for many years and there is a growing interest in combining these techniques with probabilistic considerations to assess the increased system stress due to the restructured electricity environment. The overall reliability framework proposed in this paper incorporates the deterministic N-1 criterion in a probabilistic framework, and results in the joint inclusion of both adequacy and security considerations in system planning. The combined framework is achieved using system well-being analysis and traditional adequacy assessment. System well-being analysis is used to quantify the degree of N-1 security and N-1 insecurity in terms of probabilities and frequencies. Traditional adequacy assessment is Incorporated to quantify the magnitude of the severity and consequences associated with system failure. The concepts are illustrated by application to two test systems. The results based on the overall reliability analysis framework indicate that adequacy indices are adversely affected by a generation deficient environment and security indices are adversely affected by a transmission deficient environment. The combined adequacy and security framework presented in this paper can assist system planners to realize the overall benefits associated with system modifications based on the degree of adequacy and security, and therefore facilitate the decision making process.

The Effect of 3 Dimensional Graphics on Consumer Information Processing in Online Shopping Malls (3차원 그래픽의 활용이 온라인 쇼핑몰 소비자 정보처리 과정에 미치는 영향)

  • Lee, Young-Eun;Suh, Kil-Soo
    • Asia pacific journal of information systems
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    • v.13 no.3
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    • pp.151-172
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    • 2003
  • The purpose of this research is, first, to assess empirically web3D impacts on consumer information processing. Second, this research aimed to reveal the circumstances under which web3D impact can be maximized. To achieve the second goal, products were classified into physical dominant and information dominant products, and web3D impact was assessed on these two product categories. The laboratory experiment was adopted to compare the web3D impacts on the physical dominant products with that on the information dominant products. The result of this experiment showed that overall, web3D positively influenced consumer comprehension, memory, and attitude toward the products. In detail, for the physical dominant products, subjects significantly comprehended and memorized information better and performed positive attitude toward the products. For the information dominant products, subjects significantly comprehended and memorized better but did not perform the positive attitude toward the products. This paper explains theses results by suggesting that, overall, web3D impact is large and can be maximized when the characteristics of web3D such as interactivity, realistic display of objects support the characteristics of products that web3D represents.

Shape Dependent Coercivity Simulation of a Spherical Barium Ferrite (S-BaFe) Particle with Uniaxial Anisotropy

  • Abo, Gavin S.;Hong, Yang-Ki;Jalli, Jeevan;Lee, Jae-Jin;Park, Ji-Hoon;Bae, Seok;Kim, Seong-Gon;Choi, Byoung-Chul;Tanaka, Terumitsu
    • Journal of Magnetics
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    • v.17 no.1
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    • pp.1-5
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    • 2012
  • The coercivity of a single 27 nm-spherical barium ferrite (S-BaFe) particle was simulated using three models: 1) Gibbs free energy (GFE), 2) Landau-Lifshitz-Gilbert (LLG), and 3) Stoner-Wohlfarth (S-W). Spherically and hexagonally shaped particles were used in the GFE and LLG simulations to investigate coercivity with the different shape anisotropies. The effect of shape was not included in the S-W model. It was found that the models using a spherical shape resulted in a coercivity higher than the models using the hexagonal shape with both shapes having the same diameter. The coercivity estimated with the S-W model was approximately the same as that for the spherical-shape models, which indicates that spherical shape has no significant effect on the particle's coercivity at nanoscale.

Comparison of Sapphire and Germanium Fibers for Erbium : Yag Lithotripsy

  • Lee, Ho;Yoon, Ji-Wook;Jung, Young-Dae;Kim, Jee-Hyun;Ryan, Robert T.;Teichman, Joel M.H.;Welch, A.J.
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.309-313
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    • 2008
  • We studied the sapphire and germanium fibers to determine which optical fiber best transmits Erbium:YAG laser for intracorporeal lithotripsy. Human calculi were ablated with an Erbium:YAG laser in contact mode using two fibers. Optical outputs at the distal end of fibers were measured before and after laser lithotripsy. Upon the irradiation on the calculus with the 50 mJ and 100 mJ pulse energy, the output energy at the distal end of germanium fiber declined to approximately 50% of the input energy. For the sapphire fiber, the output energy at the distal end remained unchanged with 100 mJ input energy; however the output energy had dropped to 50% for 200 mJ input energy. In order to examine how the types of target tissue affect the fiber damage, the sapphire fiber was tested for the irradiation on soft tissue and water as well. No energy decline was observed during soft tissue and water irradiation. We also characterized ablation craters with both optical fibers. Both fibers produced similar craters on calculi in terms of depth and diameter. Sapphire fibers are better suited than germanium fibers for Erbium:YAG lithotripsy in terms of the fiber damage.

Effects of Flaxseed Diets on Performance, Carcass Characteristics and Fatty Acid Composition of Hanwoo Steers

  • Kim, Chong-min;Kim, Jeong-hoon;Oh, Young-kyoon;Park, Eun-kyu;Ahn, Gyu-chul;Lee, Gang-yeon;Lee, Jung-il;Park, Keun-kyu
    • Asian-Australasian Journal of Animal Sciences
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    • v.22 no.8
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    • pp.1151-1159
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    • 2009
  • This study was conducted to determine the effects of dietary level of whole flaxseed (WFS; 0, 10 and 15%) on performance, carcass characteristics and fatty acid composition of serum and subcutaneous, perirenal, and intramuscular adipose tissues of Korean Hanwoo cattle. The daily gains were not different among treatments. Dietary inclusion of WFS decreased (p<0.05) feed intake but improved (p<0.05) feed conversion ratio (feed/gain). Backfat thickness and marbling score were increased (p<0.05) by dietary WFS. Carcass weight, dressing percentage, loin-eye area, and carcass yield and quality were not different among treatments. The proportion of C18:3 in serum and, to a lesser extent, in adipose tissues were increased (p<0.01) by dietary WFS, indicating that lipids from WFS escaped ruminal biohydrogenation. Animals fed WFS had lower proportions of saturated fatty acid (SFA; C14:0 and 16:0) and higher proportions of polyunsaturated fatty acids (PUFA; C18:2. 18:3, 20:2, 20:4, 20:5 and 22:6) in perirenal and intramuscular fat than animals fed diets without WFS, resulting in an increased PUFA/SFA ratio. Furthermore, feeding WFS increased (p<0.01) proportions of $\omega$-3 and $\omega$-6 fatty acids in intramuscular fat but decreased (p<0.05) the $\omega$-6/$\omega$-3 ratio. Relative treatment effects were similar between 10 and 15% WFS. Feeding WFS can effectively alter composition of adipose tissues with enhanced feed conversion ratio.

Handheld Echocardiography in a Clinical Practice Scenario: Concordances Compared to Standard Echocardiographic Reports

  • Gustavo Gavazzoni Blume;Luka David Lechinewski;Isabela Pedroza Vieira;Nadine Clausell;Giovana Paludo Bertinato;Paulo Andre Bispo Machado-Junior;Pedro Goulart Berro;Lidia Ana Zytynski Moura;Teresa Tsang
    • Journal of Cardiovascular Imaging
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    • v.30 no.1
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    • pp.25-34
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    • 2022
  • BACKGROUND: The purpose of this study was to assess the utility of a handheld device (HH) used during common daily practice and its agreement with the results of a standard echocardiography study (STD) performed by experienced sonographers and echocardiographer. METHODS: A prospective follow-up was conducted in an adult outpatient echocardiography clinic. Experienced sonographers performed the STD and an experienced echocardiographer performed the HH. STD included 2-dimensional images, Doppler and hemodynamics analysis. Hemodynamic assessment was not performed with the HH device because the HH does not include such technology. The images were interpreted by blinded echocardiographers, and the agreement between the reports was analyzed. RESULTS: A total of 108 patients were included; and the concordance for left ventricle (LV) ejection fraction (EF), wall motion score index, LV and right ventricle (RV) function, RV size, and mitral and aortic stenosis was excellent with κ values greater than 0.80. Wall motion abnormalities had good concordance (κ value 0.78). The agreement for LV hypertrophy, mitral and aortic regurgitation was moderate, and tricuspid and pulmonary regurgitation agreements were low (κ values of 0.26 and 0.25, respectively). CONCLUSIONS: In a daily practice scenario with experienced hands, HH demonstrated good correlation for most echocardiography indications, such as ventricular size and function assessment and stenosis valve lesion analyses.

Un-met Supportive Care Needs of Iranian Breast Cancer Patients

  • Abdollahzadeh, Farahnaz;Moradi, Narges;Pakpour, Vahid;Rahmani, Azad;Zamanzadeh, Vahid;Mohammadpoorasl, Asghar;Howard, Fuchsia
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.9
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    • pp.3933-3938
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    • 2014
  • Background: Assessment of supportive needs is the requirement to plan any supportive care program for cancer patients. There is no evidence about supportive care needs of Iranian breast cancer patients. So, the aims of present study were to investigate this question and s predictive factors. Materials and Methods: A descriptive-correlational study was conducted, followed by logistic regression analyses. The Supportive Care Needs Survey was completed by 136 breast cancer patients residing in Iran following their initial treatment. This assessed needs in five domains: psychological, health system and information, physical and daily living, patient care and support, and sexuality. Results: Patient perceived needs were highest in the health systems and information (71%), and physical and daily living (68%) domains. Logistic regression modeling revealed that younger participants have more un-met needs in all domains and those with more children reported fewer un-met needs in patient care and support domains. In addition, married women had more un-met supportive care needs related to sexuality. Conclusions: The high rate of un-met supportive care needs in all domains suggests that supportive care services are desperately required for breast cancer patients in Iran. Moreover, services that address informational needs and physical and daily living needs ought to be the priority, with particular attention paid to younger women. Further research is clearly needed to fully understand supportive care needs in this cultural context.

Improving the Surface Functionality of Curdlan by Conjugation with Unfolding Protein through Naturally Occurring Maillard Reaction

  • Nakamura, Soichiro;Ogawa, Masahiro;Saeki, Hiroki;Saito, Masayoshi;Miyasaka, Satoko;Hata, Junya;Adachi, Naoko;Hwang, Jae-Kwan
    • Preventive Nutrition and Food Science
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    • v.5 no.4
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    • pp.200-204
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    • 2000
  • Protein conjugation of curdlan belonging to $\beta$-1, 3-glucan was carried out to improve it surface functionalities. The glucan was mixed with phosvitin, {TEX}$$\alpha$_{s}${/TEX}-casein, lysozyme or ovalbumin, respectively. The mixture was freeze-dried, and he resulting powder was incubated at 6$0^{\circ}C$ and 79% relative humidity for 12 days in order to generate a controlled Maillard reaction between curdlan and proteins. conjugation with unfolding proteins, i.e., phosvitin and {TEX}$$\alpha$_{s}${/TEX}-casein, drastically increased the solubility of the glucan, whereas lysozyme and ovalbmin did not. The solubility in water of curdlan was 3.44% for the phosvitin conjugate and 1.09% for the {TEX}$$\alpha$_{s}${/TEX}-casein conjugate. SDS-slab polyacrylamide gel electrophoresis showed that curdlan was solubilized due to covalent binding with phosvitin. Emulsifying properties of curdlan were substantially improved by the conjugation with phosvitin and {TEX}$$\alpha$_{s}${/TEX}-casein. Emulsion stability of the curdlan-phosvitin conjugate was about 2.9 times greater than that of the curdlan-phosvitin mixture.

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Association of Genetic Polymorphisms of Estrogen Receptor with Litter Size using PCR-RFLP in Yorkshire Swine (Yorkshire종 돼지에서 PCR-RFLP을 이용한 Estrogen Receptor의 유전적 다형과 산자수간의 관련성)

  • Kim, J.E.;Song, W.C.;Choi, B.D.;Kho, Y.;Park, S.S.;Hong, K.C.
    • Journal of Animal Science and Technology
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    • v.45 no.4
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    • pp.523-528
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    • 2003
  • This study was performed to investigate a possible association of the porcine estrogen receptor(ER) locus with the total number of born(TNB) and number of born alive(NBA) in Yorkshire pigs. Using DNAs extracted from 242 Yorkshire pigs, the ER genotype was determined by PvuII PCR-RFLP. The ER allele frequencies of two types of A and B were 0.39 and 0.61, respectively. The least squares means of the litter size by ER genotype was evaluated. The TNB and NBA were found to be associated with an specific ER allele. The genotype at the porcine ER locus has an application potential for marker-assisted selection for litter size in pigs.

Tailored Sun Safety Messages for Outdoor Workers

  • Sajjad S. Fazel;Shelby Fenton;Nicole Braun;Lindsay Forsman-Phillips;D. Linn Holness;Sunil Kalia;Victoria H. Arrandale;Thomas Tenkate;Cheryl E. Peters
    • Safety and Health at Work
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    • v.14 no.1
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    • pp.43-49
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    • 2023
  • Background: Messaging surrounding skin cancer prevention has previously focused on the general public and emphasized how or when activities should be undertaken to reduce solar ultraviolet radiation (UVR) exposure. Generic messages may not be applicable to all settings, and should be tailored to protect unique and/or highly susceptible subpopulations, such as outdoor workers. The primary objective of this study was to develop a set of tailored, practical, harm-reducing sun safety messages that will better support outdoor workers and their employers in reducing the risk of solar UVR exposure and UVR-related occupational illnesses. Methods: We adapted a core set of sun safety messages previously developed for the general population to be more applicable and actionable by outdoor workers and their employers. This study used an integrated knowledge translation approach and a modified Delphi method (which uses a survey-based consensus process) to tailor the established set of sun safety messages for use for outdoor worker populations. Results: The tailored messages were created with a consideration for what is feasible for outdoor workers, and provide users with key facts, recommendations, and tips related to preventing skin cancer, eye damage, and heat stress, specifically when working outdoors. Conclusion: The resulting tailored messages are a set of evidence-based, expert- approved, and stakeholder-workshopped messages that can be used in a variety of work settings as part of an exposure control plan for employers with outdoor workers.