• International Journal of Naval Architecture and Ocean Engineering
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• 제6권4호
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• pp.1160-1181
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• 2014

Springing and whipping are becoming increasingly important considerations in ship design as container ships increase in size. In this study, the springing and whipping characteristics of a large container ship were investigated through a series of systematic model tests in waves. A multi-segmented hull model with a backbone was adopted for measurement of springing and whipping signals. A conversion method for extracting torsion springing and whipping is described in this paper for the case of an open-section backbone. Higher-order springing, higher-mode torsion responses, and the effects of linear and nonlinear springing in irregular waves are highlighted in the discussion.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.447-451
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• 2009

Metropolitan rapid transit has been used by one of a main transport service for several decades, but there are no monitoring system for electrical equipment condition which can cause enormous economic loss and social problem if fault occurs. Recently, necessity of condition monitoring system for electrical equipment fault came to the fore, we became carrying out a research project for a design of electrical equipment lifetime estimation system for metropolitan rapid transit. In this paper, basic design result of condition monitoring system and specification of transformer partial discharge detection system are presented, which are part of entire lifetime estimation system. Definition of target apparatus and monitoring method determined by analysis of user requirement from each railway company and, each railway company's opinions and requests were collected sufficiently by surveys and discussion.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 춘계학술발표회논문집(4)
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• pp.404-404
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• 1996

In order to ensure a concrete expansion anchor is suitable for a given application, the load resistance behavior of the anchor must be known. ASTM E488 provides a standard method of testing expansion anchors for static and dynamic loads. Due to the many types of anchors available commercially and the large variability of applications, the ASTM does not delineate all details or requirements necessary to comprehensively determine the dynamic load behavior of concrete expansion anchors. A test program is presented in this paper which was developed and implemented to determine the cyclic load behavior of wedge-type concrete expansion anchors. Test results are also presented along with a discussion of the behavior of anchors, and their suitability for use.

• 대한기계학회논문집
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• 제17권10호
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• pp.2574-2581
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• 1993

A Shadow mask in C. R. T. (Cathod Ray Tube) undergoes a temperature increase due to impinging electron beams emitted from guns, and thermal deformation from such temperature rise may cause the electron beams to island on the panel, and thus give rise to depolarization. Hence the analysis of temperature distribution for a shadow mask is an important procedure for designing the shadow mask. In this paper, we are concerned with nonlinear finite element analysis of the temperature distribution on a shadow mask. First of all, we replace shadow mask, containing numerous apertures of a slit type, by an orthotropic shell without apertures, and calculate the apparent thermal conductivities. Because of thermal radiation, which is one of the major heat transfer mechanism for shadow masks, the resulting finite element equation is nonlinear and solved by the Newton method. Finally numerical examples are illustrated for a 21" FST(Full Square Tube) shadow mask, and followed by discussion.sion.

• 컴퓨터교육학회논문지
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• 제15권2호
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• pp.29-36
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• 2012

본 논문에서는 문제중심학습(Problem-based Learning)에 기반한 인터넷 윤리 학습 모형을 개발하고 수업에 적용한다. 새로운 학습 모형은 토론과 글쓰기를 통한 학습자 참여 중심의 수업으로 이루어진다. 새로운 학습 모형을 수업에 적용한 후 인터넷 윤리의식의 변화를 조사하고 분석하였다. 연구 결과에 따르면 자율, 존중, 참여, 책임 영역에서 학습자의 인터넷 윤리의식이 향상된 것으로 확인되었다. 특히 자율과 책임 영역이 통계적으로 유의미한 향상이 있는 것으로 확인되었다.

• 한국CDE학회논문집
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• 제22권1호
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• pp.80-88
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• 2017

Product data analytics (PDA) is a data-driven analysis method that uses product data management (PDM) databases as its operational data. It aims to understand and evaluate product development processes indirectly through the analysis of product data from the PDM databases. To educate and train PDA efficiently, this study proposed an approach that employs courses for both product development and PDA in a class. The participant group for product development provides a PDM database as a result of their product development activities, and the other group for PDA analyses the PDM database and provides analysis result to the product development group who can explain causes of the result. The collaboration between the two groups can enhance the efficiency of the education and training course on PDA. This study also includes an application example of the approach to a graduate class on PDA and discussion of its result.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1780-1783
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• 2002

A problem of signal transmitted and received in OFDM systems is considered. In particular, an efficient solution to the problem of blind channel estimation based on Maximum Likelihood (ML) principle has been investigated. The paper proposes a new upper-bound cost, used in conjunction with a standard branch and bound integer programming technique for solving the ML problem. The tighter upper-bound cost exploits a finite-alphabet property of the transmitted signal. The proposed upper-bound cost was found to greatly speed up the ML algorithm, thus reducing computational complexity. Experimental results and discussion are included.

• 혜화의학회지
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• 제5권2호
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• pp.445-448
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• 1997

The human anatomy is the fundamental subject which is required lots of time and efforts for medical students. But most of the oriental medical students think it little important field. And moreover they have no active attitudes in their courses. In order to improve the present situation, the results obtained from this study are as follows: 1. As a Law of Cadaver Conservation revised systemically, there's need to have enough cadavers for dissection. 2. The teaching method must be converted into the laboratory technique with the strengthening human anatomy. 3. With opening a neuroanatomy course in oriental medical curriculum, the quality of nervous system is expected to increase. 4. Under the current medical system, there's need to have discussion deeply about the histology course.

• 여성건강간호학회지
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• 제23권1호
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• pp.1-10
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• 2017

Purpose: Aims of the researchers were to develop an birth control empowerment program (BCEP) designed to help married immigrant women in Korea to plan their pregnancies. Methods: This study was as a randomized controlled trial to verify the effects of the BCEP. The BCEP was developed based on Falk-Rafael (2001)'s Empowerment caring model. The program was offered once a week, for 90 minutes per session, for a total of 10 weeks. The BCEP incorporated group instruction, group discussion, and counseling. The eligible participants were randomly assigned to either experimental group (n=23) or control group (n=23). Results: Participants in the intervention group had significantly better outcomes in contraceptive knowledge (p<.001), contraceptive self-efficacy (p=.014), perceived contraceptive control (p<.001), sex-related spousal communication (p<.001), and sexual autonomy (p=.009). Conclusion: The BCEP was effective intervention method, which can promote family planning practices among married immigrant women.

• 대한조선학회지
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• 제2권1호
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• pp.3-8
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• 1965

The objects of this paper are to stimulated discussion of the criteria used for deciding the scantling of watertight bulkhead stiffener of steel fishing boats ranged of length of 20 meters to 80 meters and to suggest a method of calculation based on beam theory. Present knowledge is examined and it appears that failure of a bulkhead stiffener is comparatively rare. Regarding its structure bulkhead does not contribute on longitudinal strength of a ship. The strength of a bulkhead stiffener can be treated locally. Assuming bulkhead stiffeners are free ends and fixed ends theoretical required section modulus are calculated and compared with classification societies' rule. Welding effect of a bulkhead stiffener to bulkhead plate and a bracket to stiffener and deck plate are considered. On various conditions of joints are suggested.