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정태건 건국대학교 산업기술연구원 1998 건국기술연구논문지 Vol.23 No.-
Recently almost all HDDs employ the rotary type actuator system. The performance of an HDD depends on the accuracy and speed of tracking motion. The overall stiffness of the actuator system is confined by the flexibility of the flexure that is necessary to maintain the safe slider air bearing condition. This determines the upper bound of the bandwidth of the tracking servo system. We study the track seek process through the structural analysis for the actuator system considering the head/media interface. We develop the numerical analysis program to study the dynamic characteristics considering the air bearing effects. We perform the track seek simulation to estimate the effect of the suspension vibration on the air bearing status. We calculate the behaviour of the air bearing for the given tracking acceleration profile and calculate the error during track seek process due to the lateral deflection of the suspension.
압전변압기를 이용한 LCD Backlight용 구동회로의 개발
강태구,안형근,한득영 건국대학교 산업기술연구원 1998 건국기술연구논문지 Vol.23 No.-
This paper describes a driving circuit with a multi-layered piezoelectric transformer(MPT) for the LCD backlight of a portable computer. In order to develop the circuit, we measured at first the L, C, R of the MPT concerned. And, using the measured parameters of L,C,R, we designed and implemented circuits such as a voltage-frequency converter, comparator for tracking resonance frequencies varying when the backlight is turned on, power circuit with two MOSFETs, and triggering circuit with flip/flops. We showed the possibility of tracking the resonance frequency of the MPT under the various load conditions.
AO Synthes 금속판을 이용한 전방 경추 유합술후 발생한 지연성 식도 천공
송하헌,김태균,심대무 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.1
Esophageal perforation after anterior cervical discectomy operation has a rare incidence. Also Delayed Esophageal perforation after anterior cervical discectomy has a very rare incidence. Esophageal perforaton is usually characterized as being due to the surgical exposure, metallic implant, bone graft, fractured vertebrae and polymethylmethacrylate. Esophageal perforaton result in fatal mediastinitis, which may lead to die from sepsis. The mortality rate continues to be more than 20%. Factors that adversely affect the outcome include the location and severity of the esophageal injury] associated injuries and delayed diagnosis and treatment. The purpose of this report is to present the our case of a patient who had delayed esophageal perforation by irritation of metallic screw and 3 weeks post operatively, and to know how can we get a early diagnosis and treatment in delayed esophageal perforation.
가맹점의 러닝로열티 지불의도에 영향을 주는 서비스품질요인의 우선순위 연구
권태우 ( Tac Woo Kwon ),최강화 ( Kang Hwa Choi ) 한국경영공학회 2011 한국경영공학회지 Vol.16 No.1
This research is to improve the operational framework for Korean franchise business in food service by investigate the cause and effect relationships with those factors which have been provided the service from franchisor to franchisee. Although the franchise industry grows in Korea rapidly, the stability of business is still in doubt because business cycle of franchisor is get shortened. In this paper would find out the reason why the franchisor have the unstable status in Korea. The main reason was the instability of profit structures for franchisor which would be burden the franchisees that worsen the franchisor financial status. Comparing with the US franchise system, the biggest different was the running royalty program. So, this paper would prove how the running royalty program would help the franchisor to be the stable status with the continuous payment from the franchisees, and also show the how this payment would returned with better service to the franchisees. Throughout this study, It would examinate the franchisee`s intentions of running royalty payments since there is no running royalty cases in Korean franchise industry in food service. it would investigate willingness of running royalty payments with those five service quality factors which provided from the franchisor. It would analyze the hierarchy by its priorities among those SERVQUAL factors, which would affect to the intentions of running royalty payments by using AHP analysis.
Jin Tac Kim,Sueng Yeun Kang,Ji Hyang Kim,Ai-young Lee,Byung-Rok Do 한국발생생물학회 2013 한국발생생물학회 학술발표대회 Vol.2013 No.8
Human mesenchymal stem cells are known that multipotent stromal cells have the ability to divide asymmetrically, differentiate into many tissue types, and modulate cellular fate or function. Previous reports have proved that direct or indirect effects of mesenchymal stem cells in damaged cells or tissue were able to contribute to regenerative remodeling. One of incurable diseases, vitiligo is a depigmenting skin disorder resulting from the loss of melanocytes in the epidermis. Although vitiligo is a common disorder with a frequency of 0.1~2% in population, it still remains incurable and recurrent. Up to now, various treatment methods has been available for vitiligo therapy. Especially, transplantation of melanocytes (MCs) cultured with keratinocytes (KCs) is well-known therapy in clinic. We have recently reported functional role of adipose-derived stromal cells (ASCs) could assist MCs growth and maintenance of immature MCs. Therefore, the present study investigated whether the influence of ASCs may be elevated a transplantation yield of MCs in vivo. Transplantation was accomplished by syringe injection or grafting after dermabrasion. The procedure of dermabrasion is a mechanically invasive skin planning method and may be to help settle adequate location of transplanted cells to therapy. To improve an efficacy of cell transplantation, various additives or conditions of ratio were compared in vivo. These data was concluded that mixture of MCs and ASCs in the determined condition was improved engraftments of melanocytes for patients with vitiligo.