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노즐 분사력에 의해 가진되는 다중 패킷 블레이드계의 과도 진동 해석
임하성(Lim, Ha-Seong),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.7
A modeling method for the modal and the transient vibration analysis of a multi-packet blade system excited by nozzle jet forces is presented in this paper. Blades are idealized as cantilever beams and the elastic structures like disc and shroud connecting blades are modeled as coupling stiffnesses. A modified Campbell diagram is proposed to identify true resonance frequencies of the multi-packet blade system. Different from the SAFE diagram that employs three dimensional space, the modified Campbell diagram Proposed in this study employs a plane to find the true resonance frequencies. To verify the existence of true resonance frequencies, nozzle jet forces are modeled as periodic forces and transient vibration analysis were performed with the modeling method.
연성강성 효과를 고려한 회전하는 다중 블레이드 시스템의 굽힘진동 해석
임하성(Lim, Ha-Seong),권성훈(Kwon, Sung-Hun),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.9
A modeling method for the vibration analysis of rotating multi-blade systems considering the coupling stiffness effect is presented in this paper. Blades are assumed as cantilever beams and the coupling stiffness effect originates from disc or shroud between blades. As the angular speed, hub radius ratio, and the coupling stiffness vary, the natural frequencies of the system vary. Numerical results show that the coupling stiffness is very important to estimate the natural frequencies. Along with the natural frequencies, associated mode shapes, critical angular speed, and critical hub radius ratio are obtained through the analysis.
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.
모유 수유를 한 만삭아 세남매 모두에서 발생한 일과성 장병성 선단 피부염
임하성(Ha Seong Lim),정기양(Kee Yang Chung) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.10
Acrodermatitis enteropathica is a rare autosomal recessive disorder characterized by alopecia, acral and periorificial dermatitis and diarrhea. True acrodermatits enteropathica requires lifelong zinc replacement whereas transient acrodermatitis enteropathica, an acquired disorder with identical clinical features, requires only transient zinc replacement. Although premature and milk-fed infants are particularly vulnerable to development of both conditions, there have been some reports of acrodermatitis enteropathica in full-term breast-fed infants. We report a case of transient acrodermatitis enteropathica in a S-month-old, full-term, breast-fed male baby with identical history in his 2 elder siblings. The patient presented with a 5-month history of diarrhea, hair loss and crusted erythematous patches on periorificial areas, and fingers and toes. His serum zinc levels were within lower normal limits in 2 consecutive tests. His mother was also checked for zinc levels, which was normal in serum but was markedly reduced in breast milk. Diarrhea and skin lesions disappeared promptly with oral zinc supplementation and did not recur after 11 weeks of treatment. (Korean J Dermatol 2001;39(10): 1123-1126)
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),Maksym Spiryagin,유홍희(Hong Hee Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A modeling method for the vibration analysis of a rotating packet blade system is presented in this paper. Blades are assumed as cantilever beams and coupling stiffnesses originate from disc and shroud between blades. The SAFE diagram is employed to identify true resonances of a packet blade system. The SAFE diagram not only compares the frequencies of the nozzle exciting force to the natural frequencies of the system, but also compares the shapes of the exciting force to the mode shapes of the system. Dimensionless parameters are identified from the dimensionless equations of motion and numerical results show that the coupling stiffness effect is critical for the true resonance. Along with the coupling stiffness effect, the effects of hub radius ratio and the angular speed on the natural frequencies and the associated mode shapes are investigated.
임하성 ( Ha Seong Lim ),임소영 ( So Young Lim ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.7
Non-melanoma skin cancer in a psoriasis patient is known to be associated with the treatments for psoriasis such as long-term use of PUVA and cyclosporine rather than the psoriasis itself. We report here on a case of double primary squamous cell carcinoma and acanthosis on a patient who had no history of oral steroid and cyclosporine management. A 44 years old male patient presented for ulcerative skin lesion on both soles. He underwent an operation of wide excision and reconstruction for two separated malignant lesions with using a free flap and skin graft, respectively. Another skin lesion was found on his finger during the follow-up period and excisional biopsy was performed. No evidence of recurrence or metastasis of the squamous carcinoma was found during 2 years follow-up. The excisional biopsy done on his finger was revealed to be acanthosis and no further surgical intervention was needed. This case has an implication that physicians should consider the possibility of multiple skin cancers in a psoriasis patient irrespective of having received immunosuppression therapy, and physicians should try to make an early diagnosis to minimize the patient`s morbidity and mortality. (Korean J Dermatol 2010;48(7):594∼596)
정지인 ( Jea Nne Jung ),임하성 ( Ha Seong Lim ),김유찬 ( You Chan Kim ),김수찬 ( Soo Chan Kim ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.3
A poroma is usually described as a benign neoplasm arising from ductal epithelium of eccrine gland. However, in recent years there have been several reports on poromas featuring with combined sebaceous, follicular, and ductal differentiation, and thus est