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강화 남부 조간대에 서식하는 칠면초(Suaeda japonica)의 연간 생장 및 생산 양상
황지원,이균우,박흥식,Hwang, Ji-won,Lee, Kyun-Woo,Park, Heung-sik 한국해양과학기술원 2022 Ocean and Polar Research Vol.44 No.2
This study examined the growth pattern and environmental factors affecting the growth of the halophyte, Suaeda japonica, which is prevalent on tidal flats in the west coast of Korea in order to calculate annual carbon production. Quantitative sampling was conducted every month for three years from 2018 to 2020 on salt marshes located on the southern coast of Ganghwa Island. In terms of annual density affected by the germination rate at first period, especially when air temperature for winter time was constantly below 0℃ for long periods of time, germination decreased and precipitation in summer also exerted an influence. In terms of annual growth with regard to length, the part below the ground grew rapidly in the beginning after budding, while the part above ground grew at a relatively steady rate at all times. With regard to biomass, the part below the ground also increased from April in a manner similar to length growth, but decreased drastically from September with leaves falling off and water loss occurring. The part above ground showed a rapid increase from the beginning of the rainy season. Size-frequency distribution revealed broader patterns after the rainy season as individual growth varied, but from September, it stopped at all year. High growth rates were recorded in the initial phase of growth after budding and growth was rapid, but growth declined in summer when biomass increased. The annual mean production based on growth rate was calculated at 352 gDWt/m<sup>2</sup>/yr, and the highest production was 519 gDWt/m<sup>2</sup>/yr in 2018, but it has decreased since 2019. Annual carbon production was at calculated 143.41 gC/m<sup>2</sup>/yr for Suaeda japonica in the vicinity of the southern coast of Ganghwa Island.
3차원 수치모사를 통한 연료극 지지식 관형 고체산화물 연료전지의 전지 성능에 대한 연결재 구조 효과
황지원(Ji Won Hwang),이정용(Jeong Yong Lee),조동현(Dong Hyun Jo),정현욱(Hyun Wook Jung),김성현(Sung Hyun Kim) 한국청정기술학회 2010 청정기술 Vol.16 No.4
본 연구에서는 유체유동해석프로그램인 Fluent를 이용하여 연료극 지지체식 관형 고체산화물 연료전지(SOFC)에서의 연결재 구조에 따른 성능 변화를 고찰하였다. 실험적 사실과 부합되는 이론적 결과를 확보하기 위해서는 전기적으로 전극과 하나로 되어있는 연결재의 구조가 전지 성능에 어떠한 영향을 미치는지 살피는 것이 중요하다. 두께가 작은 연결재가 단전지 성능을 우수하게 하는 것으로 보아 옴(ohmic) 저항에 직결되는 연결재의 두께가 전지 성능에 있어 주요 변수임을 확인하였다. 일정 두께로 고정된 조건 하에 연결재 폭을 변화시킨 경우, 전지 성능은 상대적으로 큰 차이를 보이지 않았다. 이는 본 연구에서 고려한 SOFC의 관형 구조 특성상 연결재의 폭으로는 원주 방향으로 흘러가는 전류 경로를 효과적으로 단축시킬 수 없기 때문으로 사료된다. Effect of interconnect structure on the cell performance in anode-supported tubular solid oxide fuel cell (SOFC) has been investigated in this study, employing the Fluent CFD solver. For the robust and reliable theoretical analysis corroborating experimental results, it is of great importance to elucidate the role of interconnect which is electrically connected with electrodes on the cell characteristics. From the fact that the thin interconnect provides the enhanced cell performance, it is revealed that the interconnect thickness is a key parameter that is able to effectively control the ohmic resistance. Under the constant thickness condition, the cell performance does not considerably change with the variation of interconnect width. This is because the current passage along with circumferential direction is not effectively altered by the change of interconnect width in tubular SOFC system.
PSEL 2015를 활용한 학교관리자 직무역량 개념 도출
황지원(Ji Won Hwang),김영식(Young Sik Kim) 한국지방교육경영학회 2021 지방교육경영 Vol.24 No.2
본 연구는 교육을 둘러싼 대내외적 환경 변화에 보다 능동적이고 효과적으로 대처하고, 학교 교육의 성과를 높이는데 필요한 학교관리자의 역량을 도출하기 위하여 미국의 교육지도자 전문성 표준(PSEL 2015)를 기본 요소로 하여 학교관리자에게 필요한 직무역량 개념을 제시하였다. 구체적으로 본 연구는 학교관리자의 직무 및 직무역량에 대한 선행연구 분석 결과에 기초하여 PSEL 2015의 10가지 전문성 표준을 학교관리자 직무역량의 기본 요소로 설정하였으며, 이를 ISLLC 2008 및 신현석 외(2020)로부터 도출된 77개의 학교장 직무와 매칭하였다. 그리고 이러한 매칭 결과를 반영하여 학교관리자가 갖추어야 할 직무역량을 기본적인 직무수행을 위하여 필요한 ‘기본 역량’과 학교를 둘러싼 외부 환경 변화로 인해 새롭게 요구되는 ‘미래 역량’으로 구분하고, 각 역량별로 이들을 구성하는 하위 역량을 개념화하였다. 이와 함께 본 연구는 학교관리자 양성 과정에 있어 새로운 역량 개념 도입의 필요성을 제안하는 한편, 학교관리자에 대한 역량평가를 시범적으로 도입함으로써 학교관리자의 역량을 함양할 수 있는 구체적인 방안에 대한 고민이 필요함을 제시하였다. This study implemented the conceptualization of job competency of school administrators based on the conceptual components of PSEL(Professional Standards for Educational Leaders) 2015 to improve the performance of individual schools. Specifically, based on the previous literature review, this study utilized 10 professional standards of school administrators of PSEL 2015 to match ISLLC(Interstate Leaders Licensure Consortium) 2008 and 77 school principal’s job derived from Shin et al.(2020). Considering the result of the matching, this study identified key competencies of school administrators as basic competency, which is needed to perform basic jobs within a school, and future competency, needed to correspond new challenges surrounding schools more effectively. Then, this study suggested sub-competencies comprise basic and future competencies. Furthermore, his study tried to provide the necessity of adopting the concept of competency measurement and evaluation in the school administrator preparation system, and useful policy implications for improving current systems regarding these issues.
Polyurethane과 Poly(Ethylene Oxide)를 이용한 hybrid 나노섬유 지지체의 제작
신지원,신호준,허수진,김지희,황영미,김동화,신정욱,Shin, Ji-Won,Shin, Ho-Jun,Heo, Su-Jin,Kim, Ji-Hee,Hwang, Young-Mi,Kim, Dong-Hwa,Shin, Jung-Woog 대한의용생체공학회 2006 의공학회지 Vol.27 No.5
The object of this study is to investigate the potential of dual-electrospun polymer based structure for vascular tissue engineering, especially for the medium or small sue blood vessels. Polyurethane(PU), which is known to be biocompatible in this area, was electrospun with poly(ethylene oxide) (PEO). Concentration of PU was fixed at 20wt%, while that of PEO was set from 15 to 35wt%. Morphological features were observed by SEM image and measurement of porosity and cellular responses were tested before and after extracting PEO from the hybrid scaffolds by immersing the scaffolds into distilled water. The diameter of PEO fibers were ranged from 200nm to 500nm. The lower concentration of PEO tended to show beads. The porosity of the scaffolds after extracting PEO was highly increased with higher concentration of PEO as expected. Also, higher proliferation rate of smooth muscle cells was observed at higher concentration of PEO than at the lower concentration and without PEO. As conclusions, this dual electrospinning technique combined with PU and PEO is expected to overcome the current barrier of cell penetration by providing more space for cells to proliferation.