• 한국기계가공학회지
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• 제11권4호
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• pp.7-12
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• 2012

The cutting force for peripheral end-milling considering run-out property was estimated and its result was compared with that of measured one. An experimental coefficient modelling was used for the formulation of theoretical end-milling force by considering the specific cutting force coefficient. Also, the specific cutting force, that is the multiplication of specific cutting force coefficient and uncut chip thickness, was used for the prediction of end-milling force. The end-milling force mechanics with run-out was presented for the estimation of theoretical force in peripheral end-milling by considering the geometric shape of the workpiece part. As a result, the estimated end-milling force shows a good consistency with the measured one. And it can be used for the prediction of force history in end-milling with run-out which incurs different start and exit immersion angle in entering and exiting condition.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 추계학술대회 논문집
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• pp.93-95
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• 2007

Studies on ski-end shape control at the top end of rolling plate in heavy thick plate mill by using FEM analysis and measuring system have been performed. Plate shape behaviour at the top-end on rolling by the two different methods in finishing rolling process has been observed. One is to minimize the height of ski-end by using pass line based on the relational model between shape factor and pick-up and the other one is to prevent turn down problem caused by the impact between table roller and down bended plate on rolling by using roll speed difference. To minimize the height of ski-end, the prediction models based on the FEM analysis and measuring data was developed. The control method of ski - end shape on finishing rolling process was applied in actual mill and the height of ski-end was reduced by about 50% compared with conventional operation.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집E
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• pp.349-354
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• 2001

The present study addresses the open end correction associated with the reflection and discharge phenomena of a weak shock wave from an open end of a duct. The open end correction of the weak shock wave is investigated experimentally and by numerical computation. An experiment is made using a simple shock tube with an open end, and computation is performed to simulate the experimental flow field using the unsteady, axisymmetric, compressible, flow governing equations. The results obtained show that an open end correction should be involved for shock wave discharge and reflection problems generated from the exit of the duct with an open end baffle plate. With a baffle plate less than three times the duct diameter, it is found that the open end correction is a function of both the diameter of the baffle plate and normal shock wave magnitude. However, for a baffle plate larger than three times the duct diameter, it is independent of the baffle plate diameter. The present computations predict the results of shock tube experiment with good accuracy. A new empirical equation for prediction of the open end correction is found for the weak shock reflection and discharge phenomena occurring at the open end of the duct with and without a baffle plate.

• Fisheries and Aquatic Sciences
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• 제14권1호
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• pp.62-69
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• 2011

The effects of actively stimulating devices (ASD) on juvenile flatfish escape were studied to increase escape rates from the cod end by encouraging fish to approach the net wall. Two kinds of ASD were designed: a fluttering net panel, i.e., a free-end flag-like net panel, and a double conical rope array. Escape responses of juvenile bastard halibut were observed in a circulating water channel using two model cod ends, one made with diamond-shaped 43-mm-mesh-size polyethylene (PE) as a high-contrast cod end and the other with polyamid (PA) mono-ply as a low-contrast cod end. Retention rate was significantly lower with the double conical rope-array ASD in the PE cod end than with conventional PE cod ends only or the fluttering net-panel ASD inside the PE cod end. Mean retention rate with the low-contrast PA cod end was also significantly lower than that with the high-contrast PE conventional cod end. Therefore, active fluttering devices using a double conical rope array together with less visible low-contrast netting in the cod end could help to reduce the bycatch of juvenile flatfish by weakening their optomotor response and actively driving fish to the side net panel.

• 기본간호학회지
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• 제17권2호
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• pp.209-219
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• 2010

Introduction: The phenomenon related to sign & symptom management for end of life of the patients is of interest to researchers in nursing society today. This study was conducted to clarify and to conceptualize the factors of sign & symptom management in end of life care though nurses' perceptions on this phenomena. Methods: The qualitative study method was used to explore the experienced nurses' perceptions related to sign & symptom management in end of life care. It included a field study carried out in South Korea using in-depth interviews with 30 experienced nurses from three nursing home facilities. Results: This study identified the following categories related to end of life care with sub-categories for each category: (1) nurses' modes in identifying the signs related to patients' end of life, (2) nurses' perceived directions on patients' end of life care, (3) nurses' perceived strategies in end of life care and (4) nurses' perceived barriers in end of life care Conclusion: Through this study, characteristics of the way nurses' provide for patients' end of life care are identified, along with how nursing decisions are made to manage the sign & symptom indicating patients' end of life.

• Journal of Hospice and Palliative Care
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• 제24권1호
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• pp.26-35
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• 2021

Purpose: The purpose of this study was to determine the effects of awareness of good death and end-of-life care attitudes on end-of-life care performance in long-term care hospital nurses. Methods: This study used a cross-sectional study design. The participants were 147 nurses working at six long-term care hospitals with more than 200 beds in B city, South Korea. Data were collected using self-reported questionnaires, and analyzed with descriptive statistics, the t-test, analysis of variance, Pearson correlation coefficients, and multiple stepwise regression analysis using IBM/SPSS 26.0 for Windows. Results: The participants' awareness of good death, end-of-life care attitudes, and end-of-life care performance were positively correlated. The factors affecting end-of-life care performance were age, education level, awareness of good death, and end-of-life care attitudes; these variables explained 19.0% of end-of-life care performance. Conclusion: In order to improve long term care hospital nurses' end-of-life care performance, continuing education and training should be provided regarding awareness of good death and end-of-life care attitudes.

• 대한전자공학회논문지TC
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• 제45권3호
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• pp.46-52
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• 2008

BGP는 인터넷에서 망사업자 및 대규모 네트워크에서 네트워크간에 라우팅 정보를 교환하는 라우팅 프로토콜이다. 라우터가 end-to-end 트래픽에 대해 트래픽 엔지니어링을 위한 정책을 설정할 때 neighbor AS 이외의 AS들에게는 원하는 정책이 영향을 미치지 않기 때문에 원하는 트래픽 엔지니어링을 할 수 없는 한계가 있다. 본 논문에서는 global 정책의 설정을 통해 원하는 트래픽 엔지니어링의 특성을 반영시킬 수 있도록 함으로써 BGP에서 End-to-End간 트래픽 엔지니어링을 위한 라우팅이 실현될 수 있도록 하는 확장된 BGP 라우팅 알고리즘을 제안한다. 새로운 BGP 라우팅 알고리즘은 전통적인 BGP 라우팅 테이블의 구조적인 변경을 하지 않고 새로운 메시지 형식을 추가하지 않으며 기존의 UPDATE message를 이용하여 global 정책 설정을 하게 한다. 또한 새로운 BGP 라우터가 전통적인 BGP 라우팅 알고리즘으로 동작하는 BGP 라우터들과 함께 망을 구성하고 있는 경우에도 확장성 문제를 야기하지 않는다. 새로운 BGP 알고리즘과 전통적인 BGP 알고리즘의 성능을 비교하기 위해 패킷 loss와 평균 delay를 시뮬레이션을 통해 비교 분석하여 그 결과를 확인하였다.

• 대한기관식도과학회지
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• 제10권1호
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• pp.41-45
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• 2004

Tracheostomy and endotracheal intubation are often performed in patients with acute and chronic respiratory failure. Recently, the incidence of iatrogenic tracheal stenosis has increased. Tracheal resection and end-to-end anastomosis would be one of the most physiologic treatment options for severe tracheal stenosis. Also, this treatment can be applied to the management of trachea invaded by thyroid cancer and tracheal neoplasm. The authors aimed to analyze the outcomes of end-to-end anastomosis of trachea following segmental resection in tracheal stenosis and tracheal invasion of cancer that we have recently experienced. Materials and methods Authors retrospectively studied 19 cases treated by tracheal resection with end-to-end anastomosis between Feburuary 1996 and January 2003. 12 patients had tracheal stenosis, 6 patients had tracheal invasion by thryroid cancer and 1 patient had tracheal cancer. We analyzed the direct causes of tracheal stenosis, preoperative vocal cord function, operation technique, early and delayed postoperative complications, and the outcome of end-to-end anastomois. Result Decannulation without significant aspiration was achieved in 16 cases($89.5\%$). A 27 year-old man could not be decannulated because of restenosis. A 62 year-old woman could not be decannulated because of bilateral vocal cord palsy. Conclusion End-to-end anastomosis is a safe and effective surgical method for tracheal stenosis. Case selection for end-to-end anastomosis and preservation of recurrent laryngeal nerve during operation is very important.

• 한국강구조학회 논문집
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• 제27권2호
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• pp.243-250
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• 2015

확장단부판(extended end-plate) 접합부는 보-기둥 모멘트 접합부의 한 형태로 접합부를 구성하는 단부판(end-plate)의 두께 및 길이, 고장력볼트의 개수 및 직경, 고장력볼트의 게이지 거리, 용접부의 치수 및 길이 등에 따라서 상이한 거동특성과 에너지소산능력을 발현한다. 이러한 확장단부판(extended end-plate)는 미국 및 유럽 등지에서는 다양한 기하학적 형상으로 기둥-보 접합부에 적용되고 있다. 그러나 현재 우리나라에서는 강구조 보-기둥 접합부에 적극적으로 적용되고 있지 못한 상황이다. 이렇게 적용성이 높지 않은 이유로는 기하학적 형상변화에 따른 설계강도식 제안, 에너지소산능력 평가 및 시공지침의 제공이 적절하게 이루어지지 못하고 있기 때문이다. 따라서 이 연구에서는 단부판(end-plate) 두께가 상대적으로 얇은 기하학적 형상을 갖는 비보강 확장단부판(unstiffened extended end-plate) 접합부의 에너지소산능력을 평가하여 에너지소산능력 예측모델을 제안하기 위한 기초자료를 제공하기 위하여 진행하였다. 이를 위하여 비보강 확장단부판(unstiffened extended end-plate) 접합부에 대한 3차원 비선형 유한요소해석을 단부판(end-plate)의 두께를 변수로 하여 수행하였다.

• 정보처리학회논문지C
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• 제12C권6호
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• pp.781-792
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• 2005

본 논문은 광대역 통합망에서 오버레이를 이용하여 사용자 관점의 End-to-end QoS 지원 구조를 제안한다. 기존 광대역 통합망은 제어평면의 IMS에서 사용자평면에 존재하는 IP 전달망의 직접적인 트래픽제어와 자원예약을 수행하여 QoS를 제공한다. 그리고 사용자의 End-to-end QoS를 지원하기 위하여 전달망에서 확보한 QoS를 사용자에게 최대로 전송하고 품질 저하를 최소화하는 연구가 진행되고 있다. 하지만 이러한 기존 연구와 더불어 사용자가 요구하는 서비스 품질의 차별화, 사용자의 단말환경에 최적화된 컨텐츠의 제공과 같은 사용자 수준에서의 확장된 QoS 개념이 고려될 필요가 있다. 따라서 본 논문에서 제안하는 오버레이 서비스 네트워크 구조의 전송계층에서는 다양한 망환경에 가장 효율적인 전송 프로토콜을 사용하여 최대의 전송효율을 제공하는 프로토콜 최적화기능을 지원한다. 그리고 응용계층에서는 사용자 단말의 데이터 변환과정에서 발생하는 프로세싱지연을 네트워크로 분산시키고, 오버에이를 이용하여 사용자의 서비스수준과 응용서비스의 특징 및 단말환경에 적합한 형태로의 중간변환기능을 수행한다. 결과적으로 본 논문에서는 광대역 통합망에서 전송계층과 응용계층의 서비스 품질 제어 기능을 추가하여 사용자의 End-to-end QoS를 지원하는 오버레이 서비스 네트워크의 구조와 내부 컴포넌트 기능, 그리고 3GPP와의 연동을 통한 QoS 제공 방안을 제안한다.