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46 results on '"Ahn, S.S."'

4. Special irregular neutrosophic graphs.

Author

Banitalebi, S., Ahn, S.S., and Borzooei, R.A.

Subjects
*FUZZY graphs, *DECISION making, *ISOMORPHISM (Mathematics)
Abstract

Recently, the neutrosophic graph has been introduced as an extension of fuzzy graphs and intuitionistic fuzzy graphs, which offers more compatibility and flexibility than these two types in modeling and structuring many actual issues. In this article, using neutrosophic highly strong arc, the new notions of (totally) special irregular, highly special irregular, strongly special irregular, neighborly special irregular and special arc-irregular of neutrosophic graphs are stated. Finally, one of their utilizations relevant to offering a fixed optimization model in decision making in diverse conditions is presented. In fact,we present a decision-making problem in real-world applied example which discusses the factors influencing a companys efficiency. The presented model is, in fact, a factor-based model wherein the impact score of each factor is divided into two types of direct and indirect influences, in which the concept of neutrosophic special dominating set plays a significant role. [ABSTRACT FROM AUTHOR]

Published
2024
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20. EFFECT OF TRACE ELEMENTS (Co, Cr) ON THE MICROSTRUCTURE AND PHYSICAL PROPERTIES OF Al-Si-Cu-Mg-Fe EXTRUDED ALLOY.

Author

AHN, S.S., SHARIEF, P., LEE, C. H., SON, H. T., KIM, Y. H., KIM, Y. C., HONG, S., and HONG, S. J.

Subjects
*MICROSTRUCTURE, *ALLOYS, *THERMAL expansion, *INTERMETALLIC compounds, *TRACE elements, *TENSILE strength, *GROWTH rate
Abstract

Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence were confirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy. [ABSTRACT FROM AUTHOR]

Published
2019
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34. Applications of the Pulsatile Flow Versatile ECLS: In Vivo Studies

Author

Rho, Y. R., primary, Choi, H., additional, Lee, J.C., additional, Choi, S.W., additional, Chung, Y.M., additional, Lee, H.S., additional, Hwang, C.M., additional, Ahn, S.S., additional, Lee, R.Y., additional, Son, H.S., additional, Choi, M.J., additional, Baek, K.J., additional, Kim, J.S., additional, Suh, G.J., additional, Won, Y.S., additional, Sun, K., additional, and Min, B.G., additional

Published
2003
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37. Conus; ceylanensis

Author

Ahn, S.S., Ahn, S.S., Ahn, S.S., and Ahn, S.S.

Abstract

http://name.umdl.umich.edu/IC-MOLLUSK1IC-X-018589%5DUMMZ-MOL-18559-18594, https://quod.lib.umich.edu/cgi/i/image/api/thumb/mollusk1ic/018589/UMMZ-MOL-18559-18594/!250,250, The University of Michigan Library provides access to these materials for educational and research purposes. These materials may be under copyright. If you decide to use any of these materials, you are responsible for making your own legal assessment and securing any necessary permission. If you have questions about the collection, contact the UMMZ Mollusks Division professional staff: mollusk1ic-dlps-help@umich.edu. If you have concerns about the inclusion of an item in this collection, please contact Library Information Technology: libraryit-info@umich.edu.

40. Laparoscopic aortobifemoral bypass

Author

Ahn, S.S., Hiyama, D.T., Rudkin, G.H., Fuchs, G.J., Ro, K.M., and Concepcion, B.

Abstract

Purpose: To determine the potential benefits of applying laparoscopic techniques for the intraabdominal insertion of aortofemoral grafts and to compare results with those of conventional surgery. Methods: Having previously demonstrated the feasibility of a totally laparoscopic aortofemoral bypass technique using carbon dioxide peritoneal insufflation in a porcine model, we now report our first human experience with this laparoscopic technique in a 49-year-old man. Results: The patient's postoperative course was marked by his minimal requirements for analgesia, early ambulation, and discharge from the hospital in the morning of the third postoperative day. Conclusions: The benefits of a laparoscopic approach to aortobifemoral bypass grafting in terms of financial savings and earlier rehabilitation in this patient was significant. This less-invasive procedure warrants further investigation. (J Vasc Surg 1997;26:128-32.)

Published
1997
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41. Correlation of striatal dopamine release and peripheral hypertension after transient ischemia in gerbils

Author

Ahn, S.S., Gray-Allan, P., Wood, E.R., Ghalili, S.S., Moore, W.S., and Blaha, C.D.

Abstract

Purpose: Intracranial norepinephrine release has been associated with post-carotid endarterectomy hypertension in human beings. To study this phenomenon under more controlled conditions, we studied the relationship of cerebral catecholamines and blood pressure in gerbils, whose cerebral circulation is similar to that in human beings. Methods: Twelve anesthetized gerbils underwent iliac artery blood pressure monitoring and in vivo electrochemistry catecholamine monitoring with use of catecholamine-specific electrodes placed stereotactically into the cerebral striatum. Six gerbils underwent 10 minutes of bilateral carotid artery occlusion (ischemic), whereas six underwent carotid artery dissection without occlusion (control). Results: The control group demonstrated a continuous gradual decline in blood pressure and striatal catecholamine during the 150-minute observation period. In contrast the ischemic gerbils demonstrated a sharp catecholamine rise during ischemia, a marked catecholamine drop shortly after carotid artery unclamping, and then a secondary larger catecholamine release that peaks in 60 minutes and gradually returns to baseline in 120 minutes. The blood pressure closely followed the catecholamine levels, with a sharp 20 mm Hg rise in blood pressure above baseline during carotid artery occlusion, followed by a dramatic 10 mm Hg drop below baseline after carotid artery unclamping and then a gradual rise of the blood pressure 25 mm Hg above baseline, which peaks in 80 minutes, with a gradual decline to the same blood pressure as in the control subjects 120 minutes after ischemia. Conclusion: We conclude that striatal catecholamine release correlates with peripheral blood pressure during transient cerebral ischemia and reperfusion. This phenomenon may explain the mechanism of post-carotid endarterectomy hypertension in human beings, and this gerbil model can be used to study its prevention and treatment. (J VASC SURG 1995;22:135-41.)

Published
1995
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42. Endovascular interventions training and credentialing for vascular surgeons

Author

White, R.A., Hodgson, K.J., Ahn, S.S., Hobson II, R.W., and Veith, F.J.

Abstract

This article reviews issues concerning the training and credentialing of vascular surgeons in the use of endovascular techniques in the peripheral vascular system. These guidelines update a prior document that was published in 1993. They have been rewritten to accommodate the rapid evolution that has occurred in the field and to provide the appropriate requirements that a vascular surgeon should fulfill to be competent in the basic skills needed to safely and effectively perform all presently accepted diagnostic and therapeutic endovascular procedures. (J Vasc Surg 1999;29:177-86.)

Published
1999
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