• Journal of Communications and Networks
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• 제13권6호
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• pp.583-590
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• 2011

Full-mesh IPSec tunnels pass through a black ("unsecure") network (B-NET) to any red ("secure") networks (RNETs). These are needed in military environments, because they enable dynamically changing R-NETs to be reached from a BNET. A dynamically reconfiguring security policy database (SPD) is very difficult to manage, since the R-NETs are mobile. This paper proposes advertisement process technologies in association with the tunnel gateway's protocol that sends 'hello' and 'prefix advertisement (ADV)' packets periodically to a multicast IP address to solve mobility and security issues. We focus on the tunnel gateway's security policy (SP) adaptation protocol that enables R-NETs to adapt to mobile environments and allows them to renew services rapidly soon after their redeployment. The prefix ADV process enables tunnel gateways to gather information associated with the dynamic changes of prefixes and the tunnel gateway's status (that is, 'down'/restart). Finally, we observe two different types of performance results. First, we explore the effects of different levels of R-NET movements on SP adaptation latency. Next, we derive the other SP adaptation latency. This can suffer from dynamic deployments of tunnel gateways, during which the protocol data traffic associated with the prefix ADV protocol data unit is expected to be severe, especially when a certain tunnel gateway restarts.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제6권1호
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• pp.41-54
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• 2002

The purpose of this study is to find out what mathematical situation means, how to pose a meaningful situation and how situation-centered teaching could be done. The obtained informations will help learners to improve their math abilities. A survey was done to investigate teachers' perception on teaching-learning in mathematics by elementary teachers. The result showed that students had to find solutions of the textbook problems accurately in the math classes, calculated many problems for the class time and disliked mathematics. We define mathematical situation. It is artificially scene that emphasize the process of learners doing mathematizing from physical world to identical world. When teacher poses and expresses mathematical situation, learners know mathematical concepts through the process of mathematizing in the mathematical situation. Mathematical situation contains many concepts and happens in real life. Learners act with real things or models in the mathematical situation. Mathematical situation can be posed by 5 steps(learners' environment investigation step, mathematical knowledge investigation step, mathematical situation development step, adaption step and reflection step). Situation-centered teaching enhances mathematical connections, arises learners' interest and develops the ability of doing mathematics. Therefore teachers have to reform textbook based on connections of mathematics, other subject and real life, math curriculum, learners' level, learners' experience, learners' interest and so on.

• 한국기계가공학회지
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• 제17권6호
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• pp.105-110
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• 2018

A concrete docking hose of pump car's boom pipe line have been used in many construction sites. They are long structures with continuous cornering, similar to a trunk of the elephant, characterized by a very high pressure resistance of 20MPa. They need flexible materials and structure in order to move the hose smoothy. But commercial concrete hose is hard to handle and heavy owing to adaption of steel reinforcement. In this study, it is tried an experimental approach to the characteristic of inner rubber layer and abrasion resistance. Also, we are investigated the bursting pressure according to the reinforcement of the hose and propose the usefulness of the hose reinforced with high strengthened aramid fiber.

• 한국산학기술학회논문지
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• 제14권12호
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• pp.6403-6412
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• 2013

본 연구는 임상실습을 하는 간호학생들의 간호과정 스마트폰 애플리케이션의 사용의도를 조사하고, 이 프로그램의 적용효과를 평가하기 위해 시도되었다. 연구대상자는 대구 지역 일개의 간호대학 3학년 학생으로, 2012년 9월부터 2013년 9월까지 외과 병동 성인간호학 실습을 나가는 60명이다. 연구결과 간호과정 스마트폰 사용의도는 학습의 용이성, 사회적 영향, 자기효능감과 유의한 관계가 있었다. 그리고 대상자에게 적용된 간호과정 앱 애플리케이션은 급성통증에 대한 진단, 중재, 결과에 대한 목록이 가장 많았고, 프로그램 사용 만족도는 4.35점이었다. 이 연구결과를 통해 간호과정 앱은 임상실습 현장에서 간호과정 앱 사용에 대한 더 많은 기회와 교육을 제공하고, 그것의 활용에 관하여 손쉽게 적용될 수 있는 방안이 마련되어야 할 것이다.

• 한국광학회지
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• 제34권1호
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• pp.1-12
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• 2023

본 연구에서는 다채널 결맞음 빔결합 시스템을 위한 위상제어 방식으로 covariant matrix adaption evolution strategy (CMA-ES) 알고리즘 및 stochastic parallel gradient descent (SPGD) 알고리즘을 결합한 이중 위상제어 알고리즘을 제안하고 그 동작 특성을 전산모사를 통해 분석한다. 제안하는 CMA-ES/SPGD 이중 위상제어 알고리즘은 결합된 최종 출력광 세기가 미리 설정된 특정값에 도달하기 전까지는 그 위상제어 최적화를 CMA-ES 알고리즘을 통해 진행하고, 그 이후에는 SPGD 알고리즘으로 전환하여 진행하는 순차적 이중 구조를 취한다. 이를 이상적인 7채널과 19채널 광섬유 결합기 기반 결맞음 빔결함 시스템에 적용하였을 때, 위상제어 최적화 평균 수렴시간이 기존의 SPGD 알고리즘만 단독적용한 경우에 비해 약 10% 단축됨을 확인하였다. 뿐만 아니라, 동일한 결맞음 빔결함 시스템에서 실제 환경과 유사하게 각 채널광에 위상잡음을 부가적으로 인가한 경우, 본 연구에서 제안하는 이중 위상제어 알고리즘을 적용할 경우 주어진 조건에서 그 평균 수렴시간이 기존의 SPGD 알고리즘만 단독적용한 경우에 비해 7채널 시스템의 경우 약 17%, 19채널 시스템의 경우 약 16-27% 정도 단축됨을 확인하였다. 본 연구에서 제안한 CMA-ES/SPGD 이중 위상제어 알고리즘은 향후 실제 대기 환경과 같이 위상잡음 효과를 무시할 수 없는 조건에서 결맞음 빔결합을 구현시 매우 유용하게 활용될 수 있을 것으로 기대된다.

• 문화기술의 융합
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• 제5권2호
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• pp.139-146
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• 2019

본 연구의 목적은 남성간호사가 여성간호사에 대한 적응과정이 어떠한가를 남성의 관점에서 심도 있게 파악하여남성간호사의 여성간호사에 대한 적응의 의미를 찾는 것이다. 본 연구는 여성간호사에 대한 남성간호사의 적응은 어떠한가? 라는 연구 주제를 가지고 현상학적 방법을 통하여 남성간호사의 여성간호사에 대한 적응과정을 탐색하였다. 연구 참여자는 본 연구의 의도와 방법을 듣고 동의한 25개월 이상의 병원근무경력을 가진 남성간호사로 총 12명을 대상으로 하였다. 본 연구의 결과는 39개의 구성의미와 13개의 주제 묶음, 4개의 범주로 도출 되었다. 범주로는 부적응상황에 가로막힘, 대인관계로 동화되어 가기, 업무능력 향상시키기, 전담간호사로 피해가기로 나타났다. 본 연구 결과를 통해 남성간호사의 여성간호사에 대한 적응 과정을 이해하여 임상 현장에서 효과적인 간호인력 관리 방안 마련을 위한 기초자료로 활용될 수 있을 것이다.

• Journal of Microbiology and Biotechnology
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• 제26권11호
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• pp.1871-1880
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• 2016

Bio-oxidation is an effective technology for treatment of refractory gold concentrates. However, the unsatisfactory oxidation rate and long residence time, which cause a lower cyanide leaching rate and gold recovery, are key factors that restrict the application of traditional bio-oxidation technology. In this study, the oxidation rate of refractory gold concentrates and the adaption of microorganisms were analyzed to evaluate a newly developed two-step pretreatment process, which includes a high temperature chemical oxidation step and a subsequent bio-oxidation step. The oxidation rate and recovery rate of gold were improved significantly after the two-step process. The results showed that the highest oxidation rate of sulfide sulfur could reach to 99.01 % with an extreme thermophile microbial community when the pulp density was 5%. Accordingly, the recovery rate of gold was elevated to 92.51%. Meanwhile, the results revealed that moderate thermophiles performed better than acidophilic mesophiles and extreme thermophiles, whose oxidation rates declined drastically when the pulp density was increased to 10% and 15%. The oxidation rates of sulfide sulfur with moderate thermophiles were 93.94% and 65.73% when the pulp density was increased to 10% and 15%, respectively. All these results indicated that the two-step pretreatment increased the oxidation rate of refractory gold concentrates and is a potential technology to pretreat the refractory sample. Meanwhile, owing to the sensitivity of the microbial community under different pulp density levels, the optimization of microbial community in bio-oxidation is necessary in industry.

• 간호행정학회지
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• 제22권5호
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• pp.437-447
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• 2016

Purpose: The purpose of this study was to conduct a grounded theoretical analysis on the hospital accreditation experience of head nurses in order to understand their behavior on the adaption of this new system. Methods: The participants were 8 head nurses with more than 3 years of experience. The data were collected through in-depth interviews using audiotape recording analyzed by the constant comparative method described in Strauss and Corbin's methodology. Results: There were 113 concepts, 26 subcategories and 12 categories identified through the open coding process. In the axial coding, the following paradigm model was proposed: 1) the causal conditions were 'hardware problem' and 'software problem', 2) the contextual conditions were 'vertical relationship', 'individual preference', and 'family support', 3) the intervening conditions were 'passive conditions' and 'active conditions', 4) the action/interaction strategies were 'leading role' and 'dependent role', 5) the consequences were 'positive acceptance' and 'negative acceptance', 6) the central phenomenon was 'difficult situation' and 7) the core category was 'leading in harmony'. Conclusion: The new system led head nurses having difficulties as the middleman between the hospital administration and general nurses, but they made a continuous effort to overcome and adapt to it through a number of strategies.

• 한국실내디자인학회논문집
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• 제22권4호
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• pp.33-40
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• 2013

This study aims to recognize that creative thinking methodologies can be adopted in the spatial design. The concept of 'Convergent' and 'Divergent' used in structure of intellect model by Guilford is chosen to understand the character of creative thinking methodologies. Technical and physical contradictions is analyzed for '40 inventive principles' of TRIZ and spatial design works. Through this study, we recognize that the creative thinking methodologies consist of analysis, idea generation and evaluation phase. The psychological inertia that limits the creative thinking should be move away from solving problem, and convergent and divergent thinking have peculiarities to be adopted in condition and to be harmonized, and to set the direction of solving technical problems through to reach the target point integrated way of thinking is needed. '40 inventive principles' by Altshuller are based on engineering and useful in many areas of fields. However some principles are not accepted in design process because these are not considered in design field and paradigm is changed from machine to nature. Nowadays, nature is a prime issue for sustainable human life, because it has sustainable recycle structure and saving energy ways. Thus, creative thinking, including TRIZ is useful in design education and progress, and should be an essential element to get a new design paradigm.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2007년도 추계 종합학술대회 논문집
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• pp.799-803
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• 2007

본 논문에서는 전자교과서가 도입됨에 따라 디지털교과서를 효과적으로 운영할 수 있는 방안을 탐색하며 디지털교과서의 성공적인 활용을 위해서 서책형 교과서의 검정 및 인정 방법과 과정을 검토하고 이들 방법이 디지털교과서는 어떠한 기준과 절차에 의해 검인정이 이루어져야 하는지 검인정 방안을 제안하였다. 그리고 디지털교과서의 검인정은 전통적 서책형 교과서와는 다르게 디지털교과서 표준 사양에 적합하게 개발되었는지 심사하는 과정에 대해 제시해 보고 디지털교과서로써의 역할과 기능을 수행할 수 있는지의 형식 및 내용에 대해 검정하는 방법 등으로 구분하여 연구가 이루어졌다. 이러한 연구를 토대로 제안하고 있는 디지털교과서의 검정 방법이 새롭게 계획하고 있는 디지털교과서 검인증 과정에 적용될 수 있기를 기대한다.