기술 교육에 있어서 학습 장소에 따른 교수 방법의 효율성에 관한 이론적 고찰

권현진,류창열 충남대학교 공업교육연구소 2000 論文集 Vol.23 No.1

This study is to find the effective ways of achieving learning goals by applying appropriate teaching methods in various learning conditions. The study areas are as follows: 1. surveying various characteristics in accordance to the learning places which affect teaching methods, 2. investigating teaching methods suitable to the industrial education and workplaces, 3. researching the teaching method of the school in detail. This study is adopted literature review and analytic research in order to obtain the object. The major findings of this study are as follows: 1. The learning place can be divided into the workplace and school because of the characteristic of technology education. We should try to use these places effectively. 2. In the workplace, several teaching methods like as work observation, general work experience program, work-study, cooperative education system, internship are applied to general education and vocational education 3. Teaching methods of school are classified with the specific property of learning contents, the learning purpose, the ability of student and so on.

사회복지교육의 집중식 실습성과에 영향을 미치는 요인

권현진 장로회신학대학교 기독교사상과 문화연구원 2005 장신논단 Vol.23 No.-

사람의 피부상피세포에서 황색포도상구균의 독소인자인 Staphylococcal Protein A의 염증반응 촉진효과

권현진,김연정,장성희,배보경,윤화영,이희우,Kwon, Hyun-Jin,Kim, Yeon-Jung,Jang, Sung-Hee,Bae, Bo-Kyoung,Youn, Hwa-Young,Lee, Hee-Woo 한국미생물학회 2011 미생물학회지 Vol.47 No.4

Staphylococcus aureus is a major human pathogen that is associated with various types of local and systemic infection. Staphylococcal protin A (SPA), a highly expressed surface component of S. aureus, may have a role in virulence such as activating inflammation and interfering with immune clearance. We examined the effect of recombinant SPA on inflammatory response in human HaCaT keratinocytes. The recombinant SPA protein was prepared using the pET-28a Vector System in Escherichia coli. The expression of pro-inflammatory related adhesion molecules and cytokines in HaCaT cells incubated for 6, 12, and 24 h with SPA (2 ${\mu}g$/ml) was analyzed by comparative RT-PCR or ELISA. The expression of E-selectin, ICAM-1, MCP-1, IL-6 and IL-8 was significantly increased in HaCaT from 6 to 24 h after treatment with SPA. SPA showed the effect on the adhesion-promoting ability of U937 monocytes to HaCaT cells. Our data demonstrate that SPA stimulates inflammatory response of HaCaT cells, implicating an important factor for exacerbation of skin inflammation of immunologic disease. 황색포도상구균은 사람에게서 염증을 동반한 다양한 형태의 국소적 또는 전신적 감염을 일으키는 주요 병원균이며, 황색포도상구균에서 풍부하게 발현되는 Staphylococcal protein A (SPA)는 염증의 활성화나 면역 반응의 회피와 관련된 균력인자로서 작용할 수 있다. 본 연구에서는 사람의 HaCaT 피부상피세포에서 재조합 SPA 단백질을 이용하여 염증반응에 대한 효과를 조사하기 위해서 pET-28a 발현벡터시스템을 이용하여 성공적으로 재조합 SPA 단백질을 제작하였고, 이 단백질(2 ${\mu}g$/ml)을 6, 12 및 24시간 처리한 HaCaT 피부상피세포에서 RT-PCR 및 ELISA를 이용하여 염증관련 부착인자 및 사이토카인의 발현을 분석하였다. SPA 처리 후 6시간에서 24시간까지 E-selectin, ICAM-1, MCP-1, IL-6 및 IL-8의 발현이 현저하게 증가함을 확인하였다. 또한 SPA는 HaCaT 피부상피세포에 대한 U937 단핵구의 부착력을 증진시켰다. 따라서, 본 연구의 결과는 SPA가 HaCaT 피부상피세포의 염증반응을 촉진시킨다는 사실을 보여주었으며, 황색포도상구균에 의한 피부염증질환에 있어서 중요한 병원성인자로서의 역할을 수행한다는 사실을 시사해준다.

정보부존재 해결방안으로서 기록 생산단계 강화방안 연구

권현진,이영학 한국기록관리학회 2018 한국기록관리학회지 Vol.18 No.4

As nonexisting information affects actual information release rate, the study noted that the absence of records leads to the “nonexistence of information.” Therefore, in this research, it was argued that records management should be thoroughly controlled from the stage of record production to solve problems such as the loss/damage/neglect/destruction/misclassification/ reduction of preservation periods and more. Through the management from the production stage, it is expected that the nonexistence of information problem will not occur and can be used as a tool for a demonstration of why the nonexistence of information exists even if such information occurs. 본 연구는 기록부존재 현상이 정보부존재로 이어지는 점에 주목했다. 기록의 분실․훼손․방치․무단파기․오분류․보존기간 하향 책정 등으로 인한 기록부존재 현상을 해결하기 위해선 기록 생산단계에서부터 철저한 기록관리가 이루어져야 함을 주장하였다. 이를 통해 정보부존재가 발생하지 않을 수 있고, 정보부존재가 발생하더라도 왜 정보부존재인지에 대한 설명도구로서 쓰일 수 있을 것이라 기대한다.

Differential Scanning Calorimetry (DSC)를 이용한 유리섬유 Bisphenol-A(BPA)계 에폭시 프리프레그의 경화 반응 속도 연구

권현진,박희정,이은주,구상민,김선홍,이기윤 한국복합재료학회 2018 Composites research Vol.31 No.1

본 연구에서는 시차주사열량계(differential scanning calorimetry, DSC)를 이용하여 유리섬유로 보강된 BPA계 에폭시 프리프레그의 경화 거동을 확인하였다. 기지재로 사용된 에폭시 수지의 전체 발열량(ΔHtotal = 280.3 J/g)을 측정하기 위해 승온 실험을 하였다. 110~130oC 등온 조건에서 측정된 발열량을 통해 높은 온도 조건일수록 최대 전환율과 최대 반응 속도가 증가하는 것을 확인하였다. 또한, 에폭시 프리프레그의 자기 촉매 반응을 해석하기 위해 Kamal 방정식을 적용하였으며 높은 온도 조건에서 반응 속도 상수(k1, k2)가 큰 값으로 나타났다. 이때 얻어진 반응 속도 상수를 이용해 계산한 이론 추정치와 실험치를 비교한 결과 잘 부합하는 것을 확인하였다. 반응 초기에는 두 값이 유사하나 반응이 최종 단계에서는 반응 속도가 확산에 의해 결정되는 현상으로 인해 반응 속도의 실험치가 이론 추정치보다 더 작은 반응 속도 값을 가짐을 확인하였다. The curing behavior of glass fiber reinforced epoxy prepregs based on Bisphenol-A (BPA) was studied by differential scanning calorimetry (DSC). The total heat of reaction(ΔHtotal = 280.3 J/g) was determined based on the results of the dynamic heating scanning experiments. Isothermal experiments were carried out at 110~130°C, and it was observed that the maximum conversion and the maximum reaction rate were increased as temperature increased. Also Kamal equation was applied to analyze autocatalytic reaction of epoxy prepregs. The higher temperatures, the greater reaction rate constants (k1, k2). Theoretical values were calculated by these reaction rate constants and compared with experimental values. And it was confirmed that they were in reasonable agreement. At the beginning of the reaction, the experimental data and theoretical prediction were shown the same tendency, but at the end of reaction, the experimental data were smaller than theoretical predicted values due to reaction rates controlled by diffusion.

인터미디어 인스털레이션에 있어서 예술기호 ‘Rarus’의 의미와 효과 연구

권현진,최익서 한국공간디자인학회 2022 한국공간디자인학회논문집 Vol.17 No.5

(Research Background and Purpose) Modern spaces are renewing the present with both appearance and concepts respectively by embodying patterns that had never been learned previously. The arena of design is vigorously accepting art, technology, and so forth to present such novelty. For mutual reference and application in design-art-technology, a meticulous understanding of how created subjects are involved in human lives is needed. To this end, process exploration for a dimension higher than defining the meaning of a space, that is, signification and acceptance and meaning-thereafter, is required in the design area. For this aim, this study summons the art sign of “Rarus” proposed by Roland Barthes as a modern intermedia installation and investigates its value by examining the process in which it operates as a chief condition for the signification of space beyond being a sign of a specific author. (Research Method) A study examines the latter reasons of French semiologist Roland Barth as a theoretical study. Barth's explanation of 'Rarus' as it relates to Cy Twombly's work is based on the convergence of signification, code, and significance. The paper examines intermediate installation as a category of research subjects, examines its core concepts and types, and examines how the expected effects of 'Rarus' relate to its intended value. Based on their representation of semiotic traits and codes associated with 'Rarus', through four works published after the 1990s. As evaluation items and measures, the case analysis aims to measure, state, and compare the previously derived meaning of 'Rarus' and effects as evaluation items and measures. (Results) Through the case analysis, it was found that the art sign “Rarus,” which is replete with Barthes’ latter semiotic speculations, circulates in intermedia installation as a sign without the signifier fixed on the signified. It thus generates intertextuality, which is connected with intermediality at a coexisting level rather than unilateral convergence. This process generates relative and fluid meaning through codes of repetition, dispersion, and superimposition, that this strategy was effective. Furthermore, the corresponding effect of sign-media in the contemporary media environment dismantls or expands the space through multilayered images that become replaced by new sensations, resulting in participatory performances accompanied by sensory acts beyond being merely spectators. The subject of semantic generation is not fixed within such interactivity but exchanges its location and is newly generated as the center breaks up. (Conclusion) This study revealed that the art symbol of “Rarus,” which embraces interspersion, gap, and interval, is a primary condition for presenting discourse concerning the various semantic generation and meaning-thereafter in intermedia installation, that is, novelty such as dismantlement, decentration, and subversion, due to its meaning and effects that surpass a specific author’s symbol.

Stacking Ensemble Technique for Classifying Breast Cancer

권현진,박진혁,이영호 대한의료정보학회 2019 Healthcare Informatics Research Vol.25 No.4

Objectives: Breast cancer is the second most common cancer among Korean women. Because breast cancer is strongly associated with negative emotional and physical changes, early detection and treatment of breast cancer are very important. As a supporting tool for classifying breast cancer, we tried to identify the best meta-learner model in a stacking ensemble when the same machine learning models for the base learner and meta-learner are used. Methods: We used machine learning models, such as the gradient boosted model, distributed random forest, generalized linear model, and deep neural network in a stacking ensemble. These models were used to construct a base learner, and each of them was used as a meta-learner again. Then, we compared the performance of machine learning models in the meta-learner to determine the best meta-learner model in the stacking ensemble. Results: Experimental results showed that using the GBM as a meta-learner led to higher accuracy than that achieved with any other model for breast cancer data and using the GLM as a meta learner led to low root-meansquared error for both sets of breast cancer data. Conclusions: We compared the performance of every meta-learner model in a stacking ensemble as a supporting tool for classifying breast cancer. The study showed that using specific models as a metalearner resulted in better performance than single classifiers, and using GBM and GLM as a meta-learner is appropriate as a supporting tool for classifying breast cancer data.

국제금융위기 전·후 가계부채와 수도권 주택매매시장의 구조적 변화

권현진,유정석 국토연구원 2014 국토연구 Vol.81 No.-

There has been an ongoing debate on easing LTV and DTI in order to activate the metropolitan housing markets. Is deregulation a proper remedy to boost the housing market, or does it destabilize the household’s financial structure? In this study, we measure the systematic size of household debt with the ratio of household debt to GDP and use the panel GMM model to analyze how our household debt size proxy and other debt financing variables affect the housing market. Our findings indicate that an increase in household debt has a negative relationship with housing price after the Global Financial Crisis. However, the increase in the systematic size of household debt has a positive impact on market liquidity. Meanwhile, M1 and other interest rates have an insignificant relation with the housing market. Our findings suggest that the Korean government should have a comprehensive and thorough review over its credit risk management plan and mortgage loan regulations. 최근 수도권 주택매매시장 활성화 대책의 일환으로 대출 규제완화를 통한 매매수요의 확충이 꾸준히 논의 중이다. 이에 본 논문에서는 가계대출액 대비 국내총생산의 비율을 ‘가계부채의 구조적 크기’로 규정하고, 관련 시계열변수를 포함하여 수도권 주택시장과의 영향을 패널 GMM 모형으로 분석하였다. 분석 결과 국제금융위기 이전에는 가계부채에 대한 시장의 부담이 주택가격의 상승으로 상쇄되었다면, 위기 이후에는 차입금융의 증가에도 가격하락세가 지속되었다. 그러나 주택매매시장의 유동성 측면에서는 다소 도움이 되었다. 이와 달리 유동자금의 증대와 대출금리 인하로 인한 효과는 미미하였다. 그러므로 정부는 대출규제와 가계 부문의 신용 위험 증대에 대한 위험관리방안을 종합적으로 고려하여 시장활성화방안을 제시해야 할 것이다.

On the prescribed inlet boundary condition with no buffer zone for the subsonic compressible laminar boundary layer with hybrid application of equations

권현진,장세명 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1

In the computation of compressible Navier-Stokes equations for viscous flows, if a uniform boundary condition is enforced at the inlet of computational domain without buffer zone, the thickness of boundary layer is underestimated while the inner-layer velocity is overestimated since the pressure is artificially added due to the growth of shear velocity at the surface of a flat plate. This results in unstable and inaccurate numerical solutions, and to solve this problem, a novel hybrid method is proposed to obtain an aligned prescribed inlet boundary condition. With a solution of perturbed velocity potential equation for compressible flow and the consideration of displacement thickness of laminar boundary layer at the earlier stage, the whole domain is solved rapidly to prescribe the modified velocity profile at the inlet boundary as a next step for the main solution of full Navier-Stokes equations. For faster convergence and better numerical stability, 2D-NSCBC(two-dimensional Navier-Stokes characteristics boundary condition) is applied in the solution of full Navier-Stokes equations. The results overall give a complete success for Ma < 0.9 at least, and are even improved remarkably for the numerical stability with adoption of specified velocity despite of considerable error in the transonic flow regime above the critical Mach number 0.9. With the present method, we succeeded to remove the whole buffer zone for the inlet boundary condition of subsonic compressible flow.

[장려상] 마을안의 학교 ; 학교안에 마을

권현진,고동희 한국교육시설학회 2015 교육시설디자인 공모전 Vol.2015 No.4