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      • KCI등재

        '과학1' 중학교 교과서의 물질의 상태 변화와 분자 운동 내용이 요구하는 인지 수준 분석(제III보)

        박지은,박예슬,강순희,Park, Jieun,Park, Yesul,Kang, Soonhee 대한화학회 2013 대한화학회지 Vol.57 No.5

        우리나라 중학교 '과학1'에 실려 있는 '물질의 상태 변화'와 '분자의 운동'에 대한 서술 내용이 요구하는 인지 요구도를 분석하였다. '분자의 운동'에는 '확산과 증발', '기체의 압력과 부피', '기체의 온도와 부피', 그리고 '상태 변화와 열에너지' 개념이 포함된다. 인지 요구도 분석에 활용한 분석 준거는 영국에서 개발된 과학 교과 내용 분류틀에 있는 3종류 분석틀이다. 분석 대상인 6종 교과서 내용들이 요구하는 인지 수준들은 구체적 조작 수준과 형식적 조각 수준들이 다양하였다. 해당 내용에는 여러 인지 수준들이 있으나 그 중에서도 높은 인지 수준을 요구하는 내용들을 보면 다음과 같다. 첫째, 단원 초기에 물질의 세 가지 상태를 설명할 때에는 그 서술 내용이 요구하는 높은 인지 수준이 6종 모두 후기 구체적 조작 수준이다. 그러나 단원의 초기 이후부터는 이에 대한 설명이 모두 초기 형식적 수준이다. 분자 배열과 분자 모형에 관한 내용이 요구하는 높은 인지 수준은 모든 6종 교과서가 분자 운동으로 서술하고 있기 때문에 초기 형식적 조작 수준이다. 둘째, 확산과 증발 개념에 대한 내용이 요구하는 높은 인지 수준은 6종 교과서 모두 초기 형식적 조작 수준이다. 왜냐하면 상태 변화를 분자 운동론으로 서술하고 있어서 초기 형식적 조작 수준이다. 셋째, 기체의 압력과 부피, 기체의 온도와 부피 개념에 대한 내용이 요구하는 높은 인지 수준은 교과서 6종 모두 초기 형식적 조작 수준이다. 분자 운동을 이용한 형식적 모델을 이해해야 하고 그리고 그래프를 통해 보일 법칙과 샤를 법칙을 이해해야 하기 때문에 학생들은 고차식의 그래프를 해석해야 하며, 두 독립변수 사이의 관계를 발견해야 하므로 초기 형식적 조작 수준이다. 넷째, 상태 변화와 열에너지 개념에 대한 내용이 요구하는 높은 인지 수준은 교과서 6종 모두 초기 형식적 조작 수준이다. 물질의 끓는점과 어는점을 설명하는 고차식 그래프의 해석 능력을 요구하고 있기 때문에 초기 형식적 조작 수준이다. 물질의 상태 변화와 온도의 관계도 분자 운동론을 이용하여 서술하고 있기 때문에 초기 형식적 조작 수준이다. The purpose of this study is to analyze the cognitive demands level of the description about 'changes of state' and 'kinetic theory' on the 'science 1' textbooks by the 2007 revised curriculum. The three types of curriculum analysis taxonomy have been used to analyze the cognitive demands level of those contents on the 6 kinds of 'science 1' textbooks. The most higher level of cognitive demands about the concepts have been discussed here due to the focus of the concepts. The first, the cognitive demand level about 'three states of substances' depending on the motion of their particles in 6 textbooks is a early formal operational stage because of using by the application of kinetic theory. The second, the cognitive demand level about 'diffusion' and 'evaporation' is a early formal operational stage, because the particles move around faster so they can change their position. The third, the cognitive level of the pressure and volume in a gas is a early formal operational stage because of explaining only phenomena in simple correspondence with formal model of kinetic theory. And simple functional relationships beyond linear on the graph of the volume and pressure of gas, the volume and temperature of gas is also a early formal operational stage. The fourth, the cognitive level of the energy of heat by a change of the state is also a early formal operational stage because kinetic theory picture accepted as providing explanation by the change of the state. And functional relationships beyond linear on the graph of the explanation of boiling point of water in water is also a early formal operational stage.

      • KCI등재

        외부탄소원으로 활성화된 토착미생물에 의한 화약물질(TNT and RDX) 분해 최적화

        박지은,배범한,Park, Jieun,Bae, Bumhan 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3

        Contamination of explosive compounds in the soils of military shooting range may pose risks to human and ecosystems. As shooting ranges are located at remote places, active remediation processes with hardwares and equipments are less practical to implement than natural solutions such as bioremediaton. In this study, a series of experiments was conducted to select a suitable carbon source and to optimize dosing rate for the enhanced bioremediation of explosive compounds in surface soils and sediments of shooting ranges with indigenous microorganisms activated by external carbon source. Treatability study using slurry phase reactors showed that the presence of indigenous microbial community capable of explosive compounds degradation in the shooting range soils, and starch was a more effective carbon source than glucose and acetic acid in the removal of TNT. However, at higher starch/soil ratio, i.e., 2.0, the acute toxicity of the liquid phase increased possibly due to transformation products of TNT. RDX degradation by indigenous microorganisms was also stimulated by the addition of starch but the acute toxicity of the liquid phase decreased with the increase of starch/soil ratio. Taken together, the optimum range of starch/soil ratio for the degradation of explosive compounds without significant increase in acute toxicity was found to be 0.2 of starch/soil.

      • KCI등재

        전분 환 투입에 의한 실험실 규모 침전지 저부에서의 생화학적 환경 변화와 화약물질(TNT 및 RDX) 분해

        박지은,배범한,Park, Jieun,Bae, Bumhan 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3

        A starch ball was devised to conveniently supply carbon source to indigenous microorganisms and to enhance biotransformation of explosive compounds(TNT and RDX) in the sediments of settling basins installed in military shooting ranges. To identify optimum dose/sediment ratio for degradation of explosives in the basin, a series of bench scale settling basin experiments were performed for 30 days while monitoring supernatant pH, DO, concentrations of nitrite, nitrate, sulfate, explosive compounds, and acute toxicity measured by bacterial luminescence. Addition of starch ball induced changes in oxidation conditions from oxic to anoxic in the benthic zone of the basin, which resulted in subsequent reductive degradation of both TNT and RDX in the liquid and solid phase of basin. However, fermentation products of excess starch, acetic acid and formic acid, caused acute toxicity in the liquid phase. The optimum ratio of starch ball/sediment for explosive compounds degradation by inducing changes in bio-geochemical environments without increase in acute toxicity, was found to be 0.009~0.017.

      • KCI등재

        변인 탐색 활동을 강화한 탐구 수업 전략이 창의적 문제 해결력 신장에 미치는 효과

        박지은,강순희,Park, Jieun,Kang, Soonhee 대한화학회 2014 대한화학회지 Vol.58 No.5

        이 연구의 목적은 변인 탐색 활동을 강화한 탐구 수업 전략을 개발하고 이 전략이 학생들의 창의적 사고력, 비판적 사고력 신장에 미치는 효과를 알아보기 위한 것이다. 이를 위하여 변인 탐색 활동을 강화한 탐구 수업 DPAS 네 단계 모형인 '변인 찾기, 변인 배제, 변인 통제를 활용한 창의적 문제 해결력 탐구 수업 모형'을 개발하고 이 모형에 따라 구체적인 대학교 화학 실험 수업 전략을 개발하였다. 그리고 예비 과학 교사를 대상으로 개발한 수업 전략을 한 학기 동안 실시하였다. 그 결과, 창의적 사고력이 통계적으로 유의미하게 신장되었다(p<.05). 검사 도구의 하위 항목 중 문제 인식, 가설 설정, 변인 통제, 자료 해석 및 자료 변환에서 창의적 사고력이 유의미하게 신장된 것으로 나타났다. 또한, 비판적 사고력도 통계적으로 유의미하게 신장되었다(p<.05). 검사 도구의 하위 항목 중 가설 설정, 결론 도출 및 일반화에서 비판적 사고력이 유의미하게 신장된 것으로 나타났다. The purposes of this study were to develop teaching strategy enhancing the activity to explore variables and to examine the instructional influences on students' creative thinking skills and critical thinking skills. In this study, a model using listing-excluding-controlling variables (DPAS model) was designed and applied to the existing 'Teaching model for the enhancement of the creative problem solving skills'. And it was implemented to preservice science teachers for the one semester. Results indicated that the experimental group presented statistically meaningful improvement in creative thinking skills, especially in recognizing problems, making hypothesis, controlling of variables and interpreting & transforming of data (p<.05). In addition, the strategy contributed to improve critical thinking skills, especially in making hypothesis and making conclusion & generalization (p<.05).

      • KCI등재

        청심연자탕으로 호전된 올리브교소뇌위축증 환자 치험 1례

        박지은,이슬,이정윤,Park, Jieun,Lee, Seul,Lee, Jeongyun 사상체질의학회 2020 사상체질의학회지 Vol.32 No.4

        Objectives This study aimed to report significant improvement of dizziness, gait disturbance and dysarthria after treatment with Sasang constitutional medicine treatment on a Taeeumin patient with olivopontocerebellar atrophy. Methods A 53-year-old female diagnosed olivopontocerebellar atrophy about one year ago suffered from dizziness, gait disturbance and dysarthria. The patient was identified as Taeeumin Joyeol pattern and treated with Cheongsimyeonja-tang and Taegeuk acupuncture. The patient's main symptoms were observed using Global Assessment Scale (GAS) during the treatment period. In addition, the Unified Multiple System Atrophy Rating Scale (UMSARS) was used to assess the overall function of patient. Results We observed a significant improvement in symptoms of dizziness, gait disturbance and dysarthria using GAS, and UMSARS score decreased in Part I and II. Conclusions This case showed that Sasang constitutional medicine treatment can be effective treatment for Taeeumin patient with olivopontocerebellar atrophy. We consider that consistent treatment can contribute to improve the patient's quality of life.

      • KCI등재

        잔류유분 함유 반출처리토 재활용을 위한 호밀 식재 식물상 토성회복 가능성

        박지은,배범한,주완호,배세달,배은주,Park, Jieun,Bae, Bumhan,Joo, Wanho,Bae, Seidal,Bae, Enjoo 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3

        The amount of TPH contaminated soil treated at off-site remediation facilities is ever increasing. For the recycle of the treated-soil on farmlands, it is necessary to restore biological and physico-chemical soil characteristics and to remove residual TPH in the soil by an economic polishing treatment method such as phytoremediation. In this study, a series of experiments was performed to select suitable plant species and to devise a proper planting method for the phyto-restoration of TPH-treated soil. Rye (Secale cereale) was selected as test species through a germination test, among 5 other plants. Five 7-day-old rye seedlings were planted in a plastic pot, 20 cm in height and 15 cm in diameter. The pot was filled with TPH-treated soil (residual TPH of 1,118 mg/kg) up to 15 cm, and upper 5 cm was filled with horticulture soil to prevent TPH toxic effects and to act as root growth zone. The planted pot was cultivated in a greenhouse for 38 days along with the control that rye planted in a normal soil and the blank with no plants. After 38 days, the above-ground biomass of rye in the TPH-treated soil was 30.6% less than that in the control, however, the photosynthetic activity of the leaf remained equal on both treatments. Soil DHA (dehydrogenase activity) increased 186 times in the rye treatment compared to 10.8 times in the blank. The gross TPH removal (%) in the planted soil and the blank soil was 34.5% and 18.4%, respectively, resulting in 16.1% increase of net TPH removal. Promotion of microbial activity by root exudate, increase in soil permeability and air ventilation as well as direct uptake and degradation by planted rye may have contributed to the higher TPH removal rate. Therefore, planting rye on the TPH-treated soil with the root growth zone method showed both the potential of restoring biological soil properties and the possibility of residual TPH removal that may allow the recycle of the treated soil to farmlands.

      • KCI등재

        BIM기반 건축물 수선교체비 산정 프로세스

        박지은,유정호,Park, Jieun,Yu, Jungho 한국건설관리학회 2016 한국건설관리학회 논문집 Vol.17 No.2

        건설사업비 중 건축물의 유지관리비용이 차지하는 비중이 초기투자비만큼이나 상당하며 국내의 경우 건설공사의 생애주기비용(LCC)관점에서 설계VE검토 업무를 시행하고 있다. 건설산업의 정보화와 고도화 급속히 진행됨에 따라 BIM에 대한 관심이 고조되고 있다. 2012년부터 조달청은 500억원 이상인 공공공사에 BIM적용을 의무화를 시작으로 2016년부터 조달청이 발주하는 모든 공공공사에 BIM적용이 의무화된다. 건축설계의 패러다임이 2D방식에서 3D, 데이터관리 관점의 BIM으로의 전환이 정책적으로 이루어지고 있는 환경에서, LCC측면에서의 BIM활용에 대한 연구는 미흡한 실정이다. 특히, LCC분석 요소 중 하나인 수선교체비 산정을 위한 BIM 소프트웨어는 부재하며 상용화된 BIM저작도구에서 수선교체비 산정을 위한 정보의 전달이 부족하다. 따라서 본 연구에서는 데이터 표준 포맷인 IFC기반 수선교체비 산정을 위한 프로세스를 제안한다. 먼저, 현재 존재하는 수선교체 기준을 분석하고 BIM기반 수선교체비 산정 요구정보를 정의한다. 정의된 요구정보는 각 정보에 해당하는 IFC를 통해 추출되고, BIM기반 수선교체비 산정 요구정보 DB에 저장된다. 이는 외부 DB인 수선교체기준DB와 단가DB와 연계하여 수선교체비를 산정한다. 본 연구가 제시하는 프로세스를 통해 BIM환경에 대응하여 BIM모델을 활용한 수선교체비 산정의 효율화를 기대하며 수선교체비 뿐만 아니라 초기공사비, 에너지비용, 유지관리비용에 이르기까지 향후 LCC분석 요소에 확장하여 적용이 가능할 것이며 BIM기반 LCC분석의 표준화에 기여할 수 있다. In a construction project, the portion for maintenance costs for a building is considerable compared to the initial construction cost. As such, Life Cycle Cost (LCC) analysis is being increasingly utilized to assess the design value of engineering work in Korea. Additionally, the Public Procurement Service in Korea announced that it will be mandatory for all domestic construction projects to adopt BIM. Furthermore, the paradigm for architectural design has shifted from 2D to 3D, and to BIM, which includes a data management system. Within this background, however, there is currently no adequate BIM-based LCC analysis software and the requirements of cost estimation for repair and replacement cost for a building is not completely adequate in BIM tools such as Revit and Archicad. Therefore, this study suggests a process of cost estimation for repair and replacement (R&R) cost based on IFC data. First, we analyzed existing R&R criteria and defined BIM-based requirements when calculating R&R costs. These requirements were extracted from relevant IFC data. Subsequently, this was saved to a database and a BIM-based database was built for R&R cost estimation. Finally, this database was connected with external databases such as R&R Criteria DB and Cost Information DB to calculate R&R costs. This process is expected to improve upon the traditional process of cost estimation of R&R cost by applying a BIM model. The proposed process can contribute to a further standardizing of BIM-based LCC analysis thru application to initial construction costs, energy costs, and other maintenance costs.

      • KCI등재후보

        무작위 시청각자극이 건강한 성인의 보행에 미치는 영향

        박지은,김은아,양성민,이나현,하민혜,차유리,park, Jieun,Kim, Euna,Yang, Sungmin,Lee, Nahyun,Ha, Minhye,Cha, Yuri 대한물리치료과학회 2019 대한물리치료과학회지 Vol.26 No.1

        Purpose: The purpose of this study is to investigate the effect of visual and auditory stimulation randomly applied to healthy adults on walking. Design: Randomized Controlled Trial. Methods: Twenty-six healthy students in S college were randomly divided into visual feedback group (n=13) and auditory feedback group (n=13). The visual feedback group walked using four conditions. 1) In the red screen was shown, clap twice to the right, 2) In yellow screen, clap twice to the left, 3) In green screen, clap twice over head. 4) Do not clap in purple screen. The auditory feedback group walked using four conditions. 1)in red, clap twice to the right, 2) In yellow, clap twice left, 3) In green, clap twice over your head. 4) Do not clap in purple. All subjects measured gait variables before and after the test using G-walker. Result: The visual feedback group showed a significant decrease (p<.05) in the number of steps per minute, walking speed, and step length compared with that of normal walking. The auditory feedback group showed a significant decrease (p<.05) in the number of steps per minute, walking speed, and step length than that of normal walking. Conclusion: The results of this study suggest that visual and auditory stimulation applied to healthy adults may have significant effects on walking.

      • KCI등재

        강화상 나노입자의 용액 반응성이 구리 도금 박막에 미치는 영향

        박지은,오민주,김이슬,이동윤,Park, Jieun,Oh, Minju,Kim, Yiseul,Lee, Dongyun 한국재료학회 2013 한국재료학회지 Vol.23 No.12

        To understand how reactivity between reinforcing nanoparticles and aqueous solution affects electrodeposited Cu thin films, two types of commercialized cerium oxide (ceria, $CeO_2$) nanoparticles were used with copper sulfate electrolyte to form in-situ nanocomposite films. During this process, we observed variation in colors and pH of the electrolyte depending on the manufacturer. Ceria aqueous solution and nickel sulfate ($NiSO_4$) aqueous solutions were also used for comparison. We checked several parameters which could be key factors contributing to the changes, such as the oxidation number of Cu, chemical impurities of ceria nanoparticles, and so on. Oxidation number was checked by salt formation by chemical reaction between $CuSO_4$ solution and sodium hydroxide (NaOH) solution. We observed that the color changed when $H_2SO_4$ was added to the $CuSO_4$ solution. The same effect was obtained when $H_2SO_4$ was mixed with ceria solution; the color of ceria solution changed from white to yellow. However, the color of $NiSO_4$ solution did not show any significant changes. We did observe slight changes in the pH of the solutions in this study. We did not obtain firm evidence to explain the changes observed in this study, but changes in the color of the electrolyte might be caused by interaction of Cu ion and the by-product of ceria. The mechanical properties of the films were examined by nanoindentation, and reaction between ceria and electrolyte presumably affect the mechanical properties of electrodeposited copper films. We also examined their crystal structures and optical properties by X-ray diffraction (XRD) and UV-Vis spectroscopy.

      • KCI등재

        T커머스 이용 및 구매 결정요인 분석

        박지은(Jieun Park),김수원(Suwon Kim),김은(Eun Kim),김성철(Seongcheol Kim) 한국방송학회 2017 한국방송학보 Vol.31 No.1

        양방향 디지털TV 방송이 가능해지면서 상품 정보를 TV에서 바로 검색하고 상품을 주문·결제할 수 있는 T커머스(T-Commerce)가 등장했다. 그러나 T커머스 시장은 예상외로 지난 10년간 자리를 잡지 못했다. 소비자는 익숙하고 엔터테인먼트 요소까지 갖춘 TV홈쇼핑과 가격·정보 면에서 뛰어난 인터넷 쇼핑 사이에서 T커머스가 정확히 어떤 장점과 특징이 있는 쇼핑서비스인지 인식하지 못하고 있다. 본 연구는 계층적 분석방법(AHP)을 통해 소비자가 T커머스와 TV홈쇼핑, 인터넷쇼핑을 방문하게 하는 결정요인과 각 쇼핑채널에서의 구매 및 지속적 이용의 결정요인을 분석하여 T커머스가 향후 어떤 서비스로 포지셔닝되어야 할 것인지에 대해 방향을 제시하고자 한다. 본 연구에서는 쇼핑 채널 방문과 이용을 각각 살펴보는 두 개의 연구모형으로 구분하여 두 개의 연구모델을 제시하고 검증했다. 연구 결과, TV홈쇼핑은 즉흥적 방문이, 인터넷쇼핑은 습관적·목적성 방문이 상대적으로 많았으며, T커머스는 즉흥적·목적성·습관적 방문이 비교적 고르게 나타나 TV홈쇼핑과 인터넷쇼핑의 중간이었다. 또한, TV홈쇼핑·인터넷쇼핑·T커머스의 구매 및 지속적 이용을 결정하는 요인들의 중요도를 측정한 결과, 경제성과 판매자 신뢰가 모든 쇼핑서비스에서 가장 중요한 요인으로 나타났다. Interactive digital TV has enabled searching, ordering, and purchasing items directly on TV, which lead to high expectations for the T-commerce service. However, the performance of T-commerce has been mediocre over the past ten years. While the lack of government supervision and lukewarm business interests were pointed as reasons, the foremost problem is that consumers were unable to differentiate T-commerce from existing shopping services. T-commerce fails to position itself between the familiar and entertaining TV home shopping and online shopping that excels in price and information factors. In order to provide strategical implications for effective positioning of the T-commerce service, this study uses the AHP method to analyze the factors that make consumers visit and purchase on each of T-commerce, TV home shopping, and online shopping channels. Two models are developed and used to study what makes people 1) visit and 2) purchase at a shopping site. The results show that consumers visit TV home shopping channel spontaneously, online shopping habitually and purposefully, while T-commerce is placed in the middle with mostly spontaneous and purposeful visits. Moreover, the most important purchasing factors across TV home shopping, online shopping, and T-commerce channels were found to be affordability and credibility.

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