• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.660-665
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• 2004

본 연구에서는 비선형적인 메커니즘을 갖는 수문현상의 불확실성을 해석하고자 하는 목적으로 새로운 개념의 지배방정식이 유도된다. 제안된 모형의 불확실성은 토양 특성치의 공간적 변동성에 기인하고 있는 것으로 가정하여, 유도된 방정식은 Fokker-Planckl 방정식의 형태를 가지고 있다. 실제 유역단위에서 토양 내 수분 흐름의 연직방향 흐름을 모의하기 위해 미소단위에서 유도된 Richards 방정식은 토양의 공간적 변동성으로 말미암아 불확실한 매개변수를 갖는 비선형 추계학적 편미분방정식의 형태를 갖게 된다. 이는 먼지 수직 방향적분을 통하여 단순화된 비선형 추계학적 상미분방정식으로 전환되고, 이렇게 전환된 비선형 추계학적 상미분방정식은 다시 추계학적 Liouville 방정식을 이용하여 선형 추계학적 편미분방정식으로 전환되어진다. 최종적으로 cumulant 급수방법을 이용하여 상기 방정식을 선형 결정론적 편미분방정식으로 전환시킴으로써, 강우 시 토양 내 수분 침투현상을 모형화할 경우 유역단위에서 토양의 공간적 변동성을 설명할 수 있는 지배방정식을 유도할 수 있다.

• The Microorganisms and Industry
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• v.17 no.2
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• pp.18-21
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• 1991

생물은 자기 복제를 통한 생장이나 생명유지를 위해 에너지를 필요로 한다. 화학영양생물은 화학에너지를 발효 혹은 호흡을 통해 생물학적 에너지로 전환시키며, 광영양생물은 광합성 작용을 통해 광에너지를 이용한다. 발효, 호흡, 광합성은 모두 산화-환원 반응을 통해 이루어진다. 생물의 모든 에너지 전환반응은 산화-환원 반응, 즉 전자의 흐름으로 이루어지며 생명현상이 에너지를 필요로 하기 때문에 생명현상은 전자의 흐름으로 이루어진다고 할 수 있다. 모든 생물이 에너지 전환 반응에 산화-환원 반응을 이용한다는 말은 생물이 많은 종류의 산화-환원 효소를 보유하고 있다는 뜻이며, 실제 많은 종류의 산화-환원 효소가 발견되고 연구되었다.

• The Journal of Korean Academy of Sensory Integration
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• v.22 no.1
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• pp.54-68
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• 2024

Purpose : This study aimed to explore the clinical experiences of occupational therapists who have transitioned from adult to child occupational therapy to provide a basis for developing programs to facilitate rapid clinical adjustment for transitioning occupational therapists. Method : Telephone interviews and Colaizzi's phenomenological research method were employed. The interviewees were six occupational therapists with at least three years of clinical experience who had transitioned from hospital-based adult occupational therapy to sensory integration-focused children's occupational therapy. The interviews were recorded, transcribed, and analyzed with the participants' consent. Results : The analysis of the interview transcripts yielded 3 categories, 7 themes, and 17 meanings. The three categories were the challenges facing transitioning occupational therapists in clinical practice, the strengths gained from their post-transition clinical experiences, and the facilitators needed before the transition to ensure quick clinical adjustment. Conclusion : Training and institutional arrangements must be in place to ensure that adult occupational therapists transitioning to sensory integration-focused child occupational therapy can quickly adapt clinically and professionally to their new environments.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.477-484
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• 2012

In order to clearly define and understand an essential meaning on a growing number of immigrant women with an experience of being in pregnancy and childbirth, who married to men living in rural community in Korea, our study has been carried out with a phenomenological research method. Basic information collection was implemented by doing multiple in-depth interviews in being recorded with nine immigrant women married to the men, and also analyzed by the phenomenological method of Colaizzi. As the result of the study, the switchover in their life on the course to adaptation or transition to Korean life with experience of being pregnant and delivery generally classified into up to four categories and nine subjects. The four categories come out with "expectation of unknown world/country", "being experienced of new challenge", "feeling happiness going through anguish of hear" and "expectation/hope with her giving birth to a baby-transition in her life". Thus, the result of this study is intended to understand their difficulties likely caused or felt in adaptation to Korea life and culture, and to provide solutions or information of a program for their being actively adapted that may help get them easily assimilated into Korean life and culture.

• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.467-470
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• 2005

지구온난화 현상과 화석연료의 고갈에 대한 두려움 때문에 재생에너지에 대한 관심이 지속적으로 증가하고 있다. 이에 따라 대체에너지, 합성가스, 화학 원료, 오일 등으로 전환할 수 있는 바이오매스 활용에 대한 연구도 활발히 진행되고 있다. 바이오매스의 열화학적 전환 공정에는 열분해, 연소, 가스화 등이 이용되고 있다. 특히 열분해는 syringol, levoglucosan, guaiacol등의 고부가가치 물질들을 생산하기에 적합한 기술로 인정받고 있다. 본 연구에서는 국내에서 쉽게 구할 수 있는 톱밥, 폐목재 등의 바이오매스의 열화학적 전환 특성을 분석하였다. 사용된 바이오매스의 열분해 특성은 열중량 분석기 및 열천칭 반응기를 통해 분석하였으며 이를 통해 유동충 반응기(지름 0.2m, 높이 2m)를 설계 및 제작하였다. 반응온도 및 산소 농도가 증가할수록 levoglucosan 등의 고부가가치 물질들의 수율이 낮아지며 페놀류가 급격히 증가함을 알 수 있었다. 회재 성분이 높은 왕겨의 바이오오일 수율은 톱밥보다 $30\%$이상 낮게 나타났다

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.275-276
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• 2013

생명현상은 다양한 단백질들 간의 상호작용으로 외부의 환경에 대처하고 생명유지를 위한 다양한 생화학반응을 수행한다. 이러한 복잡한 생명현상의 과정을 이해하기 위해서 생명과학자들은 유전자 조절네트워크, 신호전달네트워크, 대사네트워크 등 다양한 종류의 네트워크를 모델링하고 있다. 하지만 각각의 모델링방법은 각 분야별로 다양하게 존재하고 있는 실정이다. 본 연구에서는 이러한 다양한 종류의 생물학적 네트워크를 통합적으로 모델링할 수 있는 통합적 모델링 시스템을 설계하고 구현하였다. 특히 신호전달 과정에 대한 블리온 모델링기법, 유전자 발현조절 및 대사과정에 대한 ODE(Ordinary Differential Equation)모델링 그리고 유전적 표현형을 분석할 수 있는 Flux 모델링을 하나의 모델링 시스템에서 설계 하였다. 또한 이 같은 다양한 종류의 모델링을 지원하기 위해서 SBML포멧을 기준으로 가시적인 모델링 시스템을 구현하였다. 특히 연구자가 모델링한 생물학적 모델이 다른 형태의 모델링기법에도 적용될 수 있도록 전환할 수 있도록 하였다. 이러한 통합적인 모델링 시스템은 향후 복잡해지는 생물학적 네트워크를 손쉽게 모델링 할 수 있는 시스템으로 활용될 것이다.

• Nuclear Engineering and Technology
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• v.25 no.2
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• pp.265-275
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• 1993

A vapor explosion has been a concern in nuclear reactor safety due to its potential for a destructive mechanical energy release. In order to properly assess the hazard of a vapor explosion, it is necessary to accurately estimate the conversion efficiency of the thermal energy to mechanical energy. In the absence of a complete model to determine the explosive energy yield, one may have to rely on a simpler upper bound estimate such as a thermodynamic model. This paper discusses various thermodynamic models and presents a clarification of each model in their mathematical formulation and the thermodynamic work conversion. It is shown that the work release in the shock adiabatic model of Board and Hall is essentially equal to that of Hicks-Menzies thermodynamic model. The effect of coolant void fraction on the explosion efficiency is also predicted based on these thermodynamic models. Finally, the Hicks-Menzies model is modified to account for the chemical reaction between a metallic fuel and water and the resultant effects on the explosion expansion work are discussed.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.58 no.2
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• pp.196-202
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• 2013

This study was conducted to evaluate the performances of rice transgenic lines along with their wild types in terms of agronomic traits. A total of 32 rice transgenic lines, through previously conducted collaborative researches between molecular biologists and conventional rice breeders, were selected as promising lines. As the introduced functional genes, 17 genes, which were putatively related with high yield, disease and herbicide resistance, abiotic stress tolerance, and diversifying endosperm starch components, were transformed into three Japonica cultivars, Nipponbare, Nagdongbyeo, and Dongjinbyeo. The transgenic lines exhibited significantly deviated performances from their wild types on agronomic traits such as days to heading, culm length and yield potential. Multivariate analyses on transgenic lines to the evaluated agronomic traits also indicated random manner of phenotypic deviations from their wild type in terms of deviation directions and degrees. Our results suggested that, therefore, breeding strategies to control unexpected deleterious phenotypic performances among transgenic lines would be critical as much as the functions and proper expressions of the transformed genes.

• Journal of Digital Convergence
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• v.15 no.9
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• pp.321-333
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• 2017

This study was a qualitative study using Colaizzi's phenomenological study method to understand the experience of reconstructing life through hemodialysis in chronic renal failure patients and to clarify the meaning of their vivid experience. The participants were eight chronic renal failure patients receiving hemodialysis. Data were collected through individual in - depth interviews with participants. The five categories that were found in the study were 'The beginning of unexpected difficulties', 'Burden of survival brought on by hemodialysis', 'The driving force of recovery', 'Choices and concentration of today in order', ' Every day life which must be woven sincerely'. The results of this study will help clinicians better understand the physical and mental suffering experienced by patients with chronic renal failure receiving hemodialysis and how they are constantly trying to adapt to a changed lifestyle. Also it might provide basic data for the development of efficient nursing intervention for the health management of hemodialysis patients.

• Journal of the Korean Geographical Society
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• v.48 no.4
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• pp.557-574
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• 2013

The paper examines the recent criticism from various viewpoints on landscape research in 'New cultural geography' focusing on the representation and duplicity of landscape as one of the key theoretical basis of the landscape school. The paper argues that landscape theories in new cultural geography should be considered as what is constantly changing over time and composed of various theoretical and genealogical elements rather than internally homogeneous, fixed, and closed system of knowledge. Through the recent 'phenomenological turn' of geography, landscape researchers explores a possibility of alternative approach to the existing theories and methods, which is so called NRT(Non-representational theory). The research objectives of the paper is to examine the theoretical and practical implications of such significant criticisms, which put emphasis on the idea of landscape as performance and practice rather than landscape as representation in cultural geography.