• 한국간호교육학회지
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• 제30권2호
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• pp.101-112
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• 2024

Purpose: The study aimed to examine doctoral students' degree acquisition paths and postgraduate research achievements and explore whether there are differences in the research achievements of doctoral degree holders in relation to the dissertation format. Methods: This study is a retrospective cohort study of nursing doctoral graduates whose degree conferral dates were between August 2013 and August 2023 that compared two dissertation tracks: traditional and publication. We evaluated the proportion of graduates in each track, publication of their dissertations, time to graduation, and the number of peer-reviewed journal publications after graduation. Results: Of the sample, 160 (87.4%) graduated in the traditional track, with only 56 (35.0%) of them publishing their dissertations after graduation. Excluding dissertations, 114 of the graduates (71.3%) published first-authored articles in the traditional track, while 12 (52.2%) did so in the publication track. The time to graduation was significantly shorter in the traditional track, with an average of 5.47±2.45 years, compared to 6.61±2.57 years in the publication track (z=2.26, p=.023). In the traditional track, 64 of graduates (40.0%) majored in adult health nursing, whereas in the publication track, 8 (34.8%) studied community health nursing. Conclusion: This study emphasizes the significance of the publication track for nursing doctoral dissertations in terms of research dissemination. Despite its numerous advantages, it is not yet the preferred choice for both students and faculty. Maintaining the publication track as an additional graduation option is worthwhile, as it allows students to gain research publishing experience before graduation and to effectively disseminate scientific findings in nursing.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.292-298
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• 2010

Recently, with the beginning of the commercial operation of high-speed railway, there have been a number of changes in track structure fields. Also, it is expected that the development and introduction of new technology will be increased afterwards. However, it accompanies a lot of risk to install new track structures of which performance and safety are not verified on permanent ways with high traffic density. Therefore, to minimize the risk and enhance the adoption of new technology, it is required to develop a systemic verification system for track structure. To do this, in this paper, main contents of a draft of guidelines for track structure verification, and main issues in debate such as criteria and method for verification, test conditions and test periods are discussed. Also, a process to choose a most appropriate one for a specific project out of proven track structures by the above verification system, the selection process by the technical investigation committee and the VE process to analyze the economical and maintenance aspects based on LCC concept in Korea Rail Network Authority is introduced.

• 한국항해항만학회지
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• 제30권2호
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• pp.119-124
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• 2006

In Part I(theoretical study) of the paper, a new adaptive autopilot for ships based on Adaptive Neural Networks was proposed. The ANNAI autopilot was designed for course-keeping, turning and track-keeping control for ships. In this part of the paper, to show the effectiveness and feasibility of the ANNAI autopilot and automatic selection algorithm for learning rate and number of iterations, computer simulations of course-keeping and track-keeping tasks with and without the effects of measurement noise and external disturbances are presented. Additionally, the results of the previous studies using Adaptive Neural Network by backpropagation algorithm are also showed for comparison.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.283-289
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• 2004

Rail defects(Corrugation, shelling, etc) are occurred by the Rail with wheel contact stress. Rail grinding is maintaining of optimal rail profile to use special rail grinding machine to remove rail defect. The benefits of rail grinding enforcement, improve track safety, improve track steering and rail life, improve ride comfort and reduce noise, etc. Actually when rail grinding plan apply to field track, we should consider a lot of function before determination, such as grinding method, grinding pass number, removing metal volume, etc. because each track has various characteristics. Therefore it is important that the determination of rail grinding strategy for optimum and economic before enforcement.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.65-70
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• 2000

Flying an aircraft is not like driving a train along a railway track. There are many factors that may affect an aircraft's course, including the wind speed and direction relative to the aircraft's intended flight path. This paper investigates noise exposed area by using INM. Especially, effect on aircraft route to minimise the number of people overflown by departing aircraft is evaluate. The result shows that track keeping scheme is effective to reduce the noise area. On the other track at 4000ft is negligible to the noise contour.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제31권1호
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• pp.85-101
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• 2017

본 연구는 초등학생들이 수 개념과 관련하여 수직선을 어떻게 이해하고 사용하는지, 또 그 학습의 어려움은 무엇인지 파악하고자 하였다. 이를 위하여 수직선 은유가 수 개념과 어떻게 관련되는지 살펴보았고, 프로이덴탈의 수 개념지도론에서 수직선의 역할에 대하여 고찰하였다. 실제 초등학생들의 수직선에 대한 이해와 사용의 어려움을 파악하기 위해 실시한 검사는 수직선에 주어진 위치에서 적절한 수를 대응시키는 문항과 학년별로 수직선이 활용되는 관련 단원 내용을 묻는 문항으로 이루어졌다. 같은 내용과 구조의 문항이지만 수직선으로 표현된 것은 해결하지 못하면서 수 트랙이나 다른 그림으로 표현된 것은 해결하는 학생들이 다수 관찰되었고, 본 연구에서는 이러한 현상의 의미를 해석하고자 하였다. 또한 다양한 교수-학습 자료(수 트랙, 그림, 빈 수직선, 이중 수직선등)를 활용하여 수직선 이해의 어려움을 보완하고 관련 수 개념 학습을 돕는 방안을 제안하였다.

• 한국철도학회논문집
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• 제17권4호
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• pp.245-250
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• 2014

본 연구에서는 콘크리트 궤도 교량의 사용성 설계를 위한 연구로서 궤도 및 교량 설계변수들이 콘크리트 궤도의 레일지지점에서의 작용력에 미치는 영향을 나타내었다. 궤도 구조에 작용하는 작용력을 구하기 위해서 각 레일 지지점의 간격이 다른 부등간격 이산지지보 모델을 유도하였다. 해석 변수는 교량의 교대 또는 교각 위치 부근의 신축이음부의 레일 지지점의 간격, 교량 거더의 받침에서부터 교량 거더 단부측의 마지막 레일지 지점까지의 거리, 그리고 추가 배치한 레일지지점의 수이다. 궤도 구조의 변위를 일으키는 요인으로는 축하중, 거더의 단위 수직단차와 단부회전각이다. 해석결과로부터 레일지지점에서의 최대압축력과 최대부상력을 구하였으며 레일지지점의 간격이 작용력에 미치는 영향을 나타내었다.

• Geomechanics and Engineering
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• 제14권6호
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• pp.563-570
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• 2018

Ballast layer has an important role in vertical stiffness and stability of railway track. In most of the Middle East countries and some of the Asian ones, significant parts of railway lines pass through desert areas where the track (particularly ballast layer) is contaminated with sands. Despite considerable number of derailments reported in the sand contaminated tracks, there is a lack of sufficient studies on the influences of sand contamination on the ballast vertical stiffness as the main indicator of track stability. Addressing this limitation, the effects of sand contamination on the mechanical behavior of ballast were experimentally investigated. For this purpose, laboratory tests (plate load test) on ballast samples with different levels of sand contamination were carried out. The results obtained were analyzed leading to derive mathematical expressions for the strain modulus ($E_V$) as a function of the ballast level of contamination. The $E_V$ was used as an index for evaluation of the load-deformation characteristics and bearing capacity of track substructure. The critical limit of sand contamination, after which the $E_V$ of the ballast reduces drastically, was obtained. It was shown that the obtained research results improve the current track maintenance approach by providing key guides for the optimization of ballast maintenance planning (the timing of ballast cleaning or renewal).

• 한국철도학회논문집
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• 제20권1호
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• pp.85-98
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• 2017

일반적으로 철도궤도 상부노반 흙재료는 연속적인 열차의 동적하중을 받게 되어 증가-감소 단계의 응력을 경험하게 된다. 이와 같이 일정한 주기에 따라 반복적으로 재하되는 축차응력(${\sigma}_d$)과 반복재하회수가 증가하게 되어 발생하는 회복변형률(${\varepsilon}_r$)의 비를 이용, 회복탄성계수($M_R$)을 산정할 수 있다. 현재까지 철도궤도하부구조에 적용할 수 있는 통일된 회복탄성계수 측정 시험법이 제시된 바 없어, 본 연구에서는 철도궤도 하부구조에 적용 가능하며, 구속압, 응력조건 및 반복재하회수 등을 종합적으로 고려할 수 있는 반복삼축압축시험에 의한 잠정 회복탄성계수 측정시험법을 제시하였다. 또한 반복삼축압축시험에 의한 잠정 시험법을 통해 산정된 회복탄성계수($M_R$)와 중형공진주시험을 통해 측정한 전단탄성계수(G)와의 상관성분석을 실시하였다.

• Journal of information and communication convergence engineering
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• 제6권1호
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• pp.86-90
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• 2008

In this paper, I have presented a new approach which can track moving objects in unknown environments. This scheme is important in providing a computationally feasible alternative to complete enumeration of JPDA which is intractable. I have proved that given an artificial measurement and track's configuration, proposed scheme converges to a proper plot in a finite number of iterations. In this light, even if the performance is enhanced by using the relaxation, we also note that the difficulty in tuning the parameters of the relaxation scheme is critical aspect of this suggestion.