• 대한수학교육학회지:수학교육학연구
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• 제25권3호
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• pp.381-405
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• 2015

최근의 고고학적으로 문맥화 된 수학사연구는 인류 초기 문명인 고대 바빌로니아의 학교에서 수학교육이 기능하였다는 사실과 함께 현존하는 가장 오래된 수학인 고대 바빌로니아의 수학적 텍스트가 학교에서 이루어진 교수-학습 과정의 산물(産物)임을 보여준다. 이러한 측면에서 학교수학의 본질과 기능에 대한 탐구의 필요성이 제기되는 바, 본 연구는 교수-학습 과정서 나타나는 산물을 포함하도록 학교수학의 개념을 확장하고 학교수학의 기능에 대한 분석을 시도하였다. 그 결과, 학교수학은 일상생활에서의 수학활동과 학문으로서의 수학의 경계를 명확히 하고 양자를 연결해왔으며 수학적 연습과 준비를 시키는 교육상황(ESMPR)과 수학적 창의성과 오류가 발현되는 교육상황(ESMCE)의 계속되는 연쇄를 통해 작동해온 것으로 파악되었다. 이로부터 본 연구자는 학습에 대한 상반된 두 패러다임인 획득으로서의 학습과 참여로서의 학습은 각각 ESMPR과 ESMCE에 대응하여 상보적으로 작동할 수 있으며 학교수학적 지식의 질적 성장이 Bruner가 말하는 교사와 학생이 형성하는 상호학습 커뮤니티가 Popper의 추측과 반박의 방법을 통해 완성해 나가는 작품으로 이해될 수 있다고 주장하였다.

• 대한산업공학회지
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• 제37권2호
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• pp.96-104
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• 2011

Modeling and simulation of human-involved complex systems pose challenges to representing human decision makings into logical systems because of the nondeterministic and dynamic nature of human behaviors. In modeling perspectives, human's activities in systems can increase uncertainty and complexity, because he or she can potentially access all other resources within the system and change the system states. To address all of these human involvements in the system, this research suggests applying the Finite State Automata (FSA)-based formal modeling of human-involved systems that incorporates the ecological concept of affordances to an evacuation simulation, so that human behavioral patterns under urgent and dynamic emergency situations can be considered in the real-time simulation. The proposed simulation methodologies were interpreted using the warehouse fire evacuation simulation to clarify the applicability of the proposed methodology. This research is expected to merge system engineering technologies and human factors, and come out to the new predictive modeling methodology for disaster simulations. This research can be applied to a variety of applications such as building layout designs and building access control systems for emergency situations.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2017년도 춘계학술대회 논문집
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• pp.81-81
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• 2017

Nanotechnology is of great importance to molecular biology and medicine because life processes are maintained by the action of a series of molecular nanomachines in the cell machinery. Recent advances in nanoscale materials that possess emergent physical properties and molecular organization hold great promise to impact human health in the diagnostic and therapeutic arenas. In order to be effective, nanomaterials need to navigate the host biology and traffic to relevant biological structures, such as diseased or pathogenic cells. Moreover, nanoparticles intended for human administration must be designed to interact with, and ideally leverage, a living host environment. Inspired by nature, we use peptides to transfer biological trafficking properties to synthetic nanoparticles to achieve targeted delivery of payloads. In this talk, development of nanoscale materials will be presented with a particular focus on applications to three outstanding health problems: bacterial infection, cancer detection, and traumatic brain injury. A biodegradable nanoparticle carrying a peptide toxin trafficked to the bacterial surface has antimicrobial activity in a pneumonia model. Trafficking of a tumor-homing nanoprobes sensitively detects cancer via a high-contrast time-gated imaging system. A neuron-targeted nanoparticle carrying siRNA traffics to neuronal populations and silences genes in a model of traumatic brain injury. Unique combinations of material properties that can be achieved with nanomaterials provide new opportunities in translational nanomedicine. This framework for constructing nanomaterials that leverage bio-inspired molecules to traffic diagnostic and therapeutic payloads can contribute on better understanding of living systems to solve problems in human health.

• 대한간호학회지
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• 제49권5호
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• pp.505-514
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• 2019

Purpose: This study aimed to introduce and elucidate changes in Strauss and Corbin's grounded theory and discuss its application to the field of nursing in South Korea. Methods: The changes in grounded theory by Strauss and Corbin were examined through a literature review of grounded theory from its inception. Results: Strauss and Corbin acknowledged their philosophical backgrounds of symbolic interactionism and pragmatism; however, their methodology based on positivism overwhelmed their epistemology and ontology. This inconsistency has been represented by the coding paradigm and the premise of "emergent from the data." In the revised version of Basics, Strauss and Corbin modified their theory to weaken the coding paradigm and strengthen the strategies for the development of substantive theory. Conclusion: Strauss and Corbin's revised grounded theory did not fully address the inconsistency of their epistemology and ontology between their acknowledgement and methodology. However, these changes constitute a meaningful step toward resolving inconsistencies and highlight the development of substantive theory. This has implications for Korean nursing researchers who have utilized methodologies in grounded theory with dogmatic approaches; grounded theory, with its evolving nature, is not a finalized method and calls for open approaches for the development of a grounded theory that fits Korean nursing.

• 한국컴퓨터정보학회논문지
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• 제12권5호
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• pp.273-284
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• 2007

본 논문은 재구성가능생산시스템 환경에서 e-MarketPlace를 통한 거래상황을 도입한 주기적 검토 재고모형을 연구한다. 의사결정권자는 고객의 확률적 수요를 만족시키기 위해서 생산용량/생산량을 확장/축소하거나 e-Marketplace를 통해 긴급으로 재고를 보충/처리한다. e-MarketPlace로부터의 거래 시 재고의 보충/처리에 걸리는 리드타임은 시스템의 생산리드타임보다 짧지만, 단위거래비용(구매/판매비용)은 생산용량/생산량을 한 단위 확장/축소하는 비용보다 높기 때문에 각 대안들의 비용-리드타임간의 trade-off가 고려된다. 추가적으로 e-MarketPlace로부터 재고를 보충하거나 생산용량을 확장하는 경우 그 수량에 따른 규모의 경제를 고려하기 위해 고정 비용이 포함된다. 우리는 제안되는 모형의 최적 정책형태를 규정하기 위해 동적계획모형과 K-convexity 기법을 적용하고, base stock policy와 (s,S) type policy의 조합으로 구성된 최적 생산-재고관리 정책을 제시한다.

• 영어영문학
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• 제53권2호
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• pp.307-333
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• 2007

When W. E. B. Du Bois says that "the problem of the twentieth century is the problem of the color line," such a statement clearly recognizes the significance of the issue of racial identity, a cultural phenomenon called 'passing.' Both Johnson in The Autobiography of an Ex-Colored Man and Larsen in Passing confront this issue. Both novels, using the metaphor of passing, not only trace the racial anxiety and race politics of the time but also expose the unstable landscape of the established social and cultural boundaries of racial identity. Mapping out multiple meanings and various dimensions of passing, this paper argues how Johnson's and Larsen's narratives display the ambivalence of color line while they at the same time complicate, problematize, and destabilize the mainstream racial boundaries and differences. It furthers to delineate how the two writers, with difference, deal with the problem of passing, the significance of racial identity, and black middle class values along with its intraracial differences. Rather than draw a clear definition of and a definitive closure on passing narrative, this paper focuses on its complexities and undecidability, challenging every dimension of its established significations. It also explores the complex dynamic between passing act and individual identity, for passing here is not just a racially signified term but extends its significance to the other factors of identity, such as class and even sexuality. Johnson and Larsen open up a site for a newly emergent, modern racial identity for black middle class in the twentieth century American urban spaces. Both writers, illuminating the subversive and slippery nature of language in their passing narrative, clearly herald new, different forms of Afro-American writings and themes for the different century they face.

• 한국습지학회지
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• 제6권3호
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• pp.107-118
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• 2004

우포늪 및 우포늪과 수문학적으로 연관된 토평천을 대상으로 관속식물상과 홍수시 유량 변화에 따른 식물종의 변화를 조사하였다. 본 조사에서는 우포 256종류, 목포 242종류, 사지포 265종류, 쪽지벌 177종류, 토평천 상류 201종류, 토평천 하류 180종류 등으로서 모두 86과 232 속 302종 42변종 6품종 등 총 350종류가 확인되었는데, 수생식물 36종류, 습생식물 96종류 및 육상식물 218종류였다. 수생식물을 생활형별로 분류한 결과는 정수식물 19종류, 부엽식물 6종류, 부수식물 4종류, 침수식물 7종류 등이었다. 우포늪에 분포하는 관속식물 중 법적 보호종 및 기타 보호 가치가 있는 식물로는 가시연꽃, 자라풀, 창포, 쥐방울덩굴, 물여뀌 등이었다. 조사 지역에 분포하는 귀화식물은 우포늪 27종류, 목포 25종류, 사지포 35종류, 쪽지벌 21종류, 토평천 상류 26종류 및 토평천 하류 24종류이며, 우포늪 전체로는 43종류였는데 이는 우포늪 전체에서 출현한 관속식물의 12.3%에 해당한다. 홍수시 유량 변화에 따른 식물종의 분포 변화 양상을 예측하기 위하여 장마 전 후를 중심으로 관속식물의 분포 현황을 조사한 결과 장마 전에는 165~244종으로서 총 299 종류였고, 장마 후에는 86~212종으로서 총 299 종류로서 6개 조사 지소 모두 장마 전의 분포 종수가 장마 후보다 많았으며, 전체 분포 종수는 장마 전 및 후 모두 299 종류로 같았다. 장마 전 및 장마 후를 기준으로 관속식물의 생활형별 분포 종수를 조사한 결과 수생식물, 습생식물 및 육상식물의 장마 전 분포 종수는 33, 83 및 183종류였고, 장마 후에는 29, 83 및 187종류였다. 그리고 수생식물의 경우 생활형별 분포 종수도 장마 전과 장마 후의 분포 상황에 큰 차이를 나타내지 않았다. 이와 같이 장마 전과 장마 후의 전체 분포 종수 및 생활형별 분포 종수에 큰 차이가 없는 것은 조사 지역에 분포하는 수생 및 습생식물들이 대부분 늪의 수위 변동에 적응된 종들이기 때문인 것으로 추정된다. 그러나 우포늪과 토평천의 습지가 훼손될 경우 각종 악영향이 예상된다.

• 디지털융복합연구
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• 제12권8호
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• pp.501-513
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• 2014

본 연구는 시부모를 동거부양하고 있거나 그러한 경험이 있으며 혼인연령이 5년 이상 된 한국의 기혼여성, 결혼이주 중국여성, 결혼이주 일본여성을 대상으로 하여 한국에서의 시부모부양경험을 파악하는데 연구의 목적이 있다. 부양경험을 잘 표현할 수 있는 대상자를 포함하기 위해 의도적 표집을 사용하였다. 결혼이주 중국여성과 일본여성의 경우, 다문화가족지원센터에 등록된 결혼이주여성 중 비교적 한국어 의사소통이 원활하고, 혼인연령이 5년 이상 되었으며, 시부모와 부양경험이 있는 여성을 국가별로 5명 이상씩 추천받았고, 한국 기혼여성의 경우 주변의 추천을 받았다. 연구 예비 참여자에게 전화로 연구취지를 설명하고 연구 동의를 구하였으며, 연구 참여에 동의한 대상자에게 서면으로 동의서를 받고 심층면담을 진행하였다. 심층면접 내용의 분석을 위해서는 Colaizzi의 현상학적 연구 방법을 선택하였다. 연구결과 본질주제는 '효 문화의 전통성에 대한 긍정적 인식', '주변의 도움과 격려', '고단한 시집살이', '적응하기 어려운 한국의 가족문화', '남성 중심적인 불합리한 가부장적 문화'였다.

• Journal of Ecology and Environment
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• 제43권2호
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• pp.104-116
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• 2019

Background: The composition of wild bird populations in temperate zones greatly varies depending on phenological changes rather than other environmental factors. Particularly, wild birds appearing in wetlands fluctuate greatly due to the crossover of species arriving for breeding during the summer and for wintering. Therefore, to understand the changes to species composition related to phenology, we conducted this basic analysis of populations to further the cause of the protection of wetland-dependent wild birds. Methods: It is wrong to simply divide a wild bird population investigation into seasons. This study identifies species composition and indicator species that change along with seasons. Wetlands to be surveyed are protected by natural monuments and wetland inventory and are in a state close to nature. In order to identify as many species as possible in wetlands, a survey was conducted in both shallow and deep wetlands. The water depth varied in these areas, ranging from 0.2 to 2.0 m, allowing for both dabbling and diving ducks to inhabit the area. Surveys were conducted using line-transect and distance sampling methods and were conducted at intervals of 2 weeks. The survey was conducted under the following three categories: the eco-tone and emergent zone, the submergent zone, and the water surface. The survey was conducted along a wetland boundary by observing wild birds. A PC-ord program was used for clustering, and the SAS program was used to analyze the changes in species composition. The data strongly indicates that day length is the main factor for seasonal migration periods, despite the fact that climate change and increasing temperatures are often discussed. Results and conclusions: The indicator species for determining seasons include migrant birds such as Ardea cinerea, Alcedo atthis, Anas penelope, and Poiceps ruficollis, as well as resident birds such as Streptopelia orientalis and Emberiza elegans. Importantly, increases in local individual counts of these species may also serve as indicators. The survey results of seasonal fluctuations in temperate zones shows that spring (April to June), summer (July to September), autumn (October), and winter (November to March) are clearly distinguishable, even though spring and summer seasons tend to overlap, leading to the conclusion that additional research could more clearly identify fluctuation patterns in species composition and abundance in the study area.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.92-92
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• 2014

Recently, many state-of-art spectroscopy techniques are used to unravel the mysteries of condensed matters. And numerous heterostructures have provided a new avenue to search for new emergent phenomena. Especially, near the interface, various forms of symmetry-breaking can appear, which induces many novel phenomena. Although these intriguing phenomena can be emerged at the interface, by using conventional measurement techniques, the experimental investigations have been limited due to the buried nature of interface. One of the ways to overcome this limitation is in situ investigation of the layer-by-layer evolution of the electronic structure with increasing of the thickness. Namely, with very thin layer, we can measure the electronic structure strongly affected by the interface effect, but with thick layer, the bulk property becomes strong. Angle-resolved photoemission spectroscopy (ARPES) is powerful tool to directly obtain electronic structure, and it is very surface sensitive. Thus, the layer-by-layer evolution of the electronic structure in oxide heterostructure can be investigated by using in situ ARPES. LaNiO3 (LNO) heterostructures have recently attracted much attention due to theoretical predictions for many intriguing quantum phenomena. The theories suggest that, by tuning external parameters such as misfit strain and dimensionality in LNO heterostructure, the latent orders, which is absent in bulk, including charge disproportionation, spin-density-wave order and Mott insulator, could be emerged in LNO heterostructure. Here, we performed in situ ARPES studies on LNO films with varying the misfit strain and thickness. (1) By using LaAlO3 (-1.3%), NdGaO3 (+0.3%), and SrTiO3 (+1.7%) substrates, we could obtain LNO films under compressive strain, nearly strain-free, and tensile strain, respectively. As strain state changes from compressive to tensile, the Ni eg bands are rearranged and cross the Fermi level, which induces a change of Fermi surface (FS) topology. Additionally, two different FS superstructures are observed depending on strain states, which are attributed to signatures of latent charge and spin orderings in LNO films. (2) We also deposited LNO ultrathin films under tensile strain with thickness between 1 and 10 unit-cells. We found that the Fermi surface nesting effect becomes strong in two-dimensions and significantly enhances spin-density-wave order. The further details are discussed more in presentation. This work was collaborated with Hyang Keun Yoo, Seung Ill Hyun, Eli Rotenberg, Ji Hoon Shim, Young Jun Chang and Hyeong-Do Kim.