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Modal analysis of a multi-blade system undergoing rotational motion
임하성,유홍희 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.8
A modeling method for the modal analysis of a multi-blade system undergoing rotational motion is presented in this paper. Blades are assumed as cantilever beams and the coupling stiffness which originates from the shroud flexibility is considered for the modeling. To obtain general conclusions from the numerical results, the equations of motion are transformed into a dimensionless form. Dimensionless parameters related to the angular speed, the hub radius, and the coupling stiffness are identified and the effects of the parameters on the modal characteristics of the system are investigated. It is shown that the coupling stiffness especially plays an important role to change the modal characteristics of the system. The range of critical angular speed is also obtained through the numerical analysis.
임하성(Ha Seong Lim),정기양(Kee Yang Chung) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.1
N/A Background:The measurement of the hardness of a skin lesion is an important component of cutaneous examination in evaluating the progression of diseases such as scleroderma. Current methods to assess hardness have not gained wide acceptance because they tend to be cumbersome, time consuming, and costly. Objective:The purpose of this study was to obtain the normal range of skin hardness according to anatomical sites, age groups and sex, and to show the differences among them. Methods:Ten different anatomical locations of 123 normal Korean individuals (61 males and 62 females) were measured with a durometer. Results:1.Skin hardness between the two sexes showed significant difference in extensor upper arm, extensor forearm, back, posterior thigh and calf. Excluding the extensor upper arm, male skin was generally harder than female. Shin and calf were significantly harder and flexor upper arm and abdomen were significantly softer than other areas. 2.The tendency of the hardness was similar in each age group. Shin was significantly harder than all other areas in 11-20, 21-30, and 51-60 age groups. Although flexor upper arm and abdomen showed statistically significant softness in 51-60 and >60 age groups, they tended to be softer than other areas in all age groups. 3.Although statistical significance was not seen among all the age groups, age group <11 tended to be harder than other age groups in flexor upper arm, extensor upper arm, flexor forearm and abdomen. Conclusion:Skin hardness measured with a durometer showed variation according to sex, age and location. The durometer is an effective, reliable and easy tool especially for the follow-up of the changes in skin hardness in an individual. (Korean J Dermatol 2002;40(1):19~24)
임하성 ( Ha Seong Lim ),황성원 ( Sung Won Whang ),윤도흠 ( Do Heum Yoon ),이민걸 ( Min Geol Lee ) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.9
Unilateral localized hyperhidrosis over scalp and face is an extremely rare disease that usually has undetermined origin. We report a case of idiopathic unilateral localized hyperhidrosis over left scalp and face. A 55-year-old female patient with unilateral hyperhidrosis that is localized in the left side of scalp and face visited our dermatology clinic. She had increased sweating in left face and scalp, securring in summer for 3 years. She complained of the exacerbation by thermal and gustatory stimuli and exercise. The starch iodine test and digital infrared thermal imaging test revealed a marked increase in sweat gland activity on the affected areas as compared to the contralateral normal sites.