• Journal of Korea Trade
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• 제26권1호
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• pp.1-19
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• 2022

Purpose - This paper analyzes the economic and non-economic factors that contribute to environmental sustainability by reducing CO₂ emissions, based on G20 panel data. Design/methodology - We conduct a comparative analysis of advanced and developing economies during 1995-2016. To examine the impact, an environmental Kuznets curve (EKC) model was employed, incorporating additional explanatory variables such as internet use, renewable energy, and services trade. Findings - The empirical findings show the existence of an inverted U-shaped EKC phenomenon between GDP per capita and CO₂ emissions in G20 economies, with the turning point at a per capita GDP level of US$ 38,340. Moreover, an inverted U-shape relation exists between internet use and CO₂ emissions, with the turning point at a 44% internet use rate. The comparative analysis show that the inverted U-shape curve only exits in advanced economies, with turning points of US$ 42,356 per capita GDP and 27% internet use rate, respectively. Renewable energy and services trade have a greater negative impact on CO₂ emissions in advanced economies than in developing economies. Originality/value - Renewable energy and services trade have a greater negative impact on CO₂ emissions in advanced economies than in developing economies. Overall, the results suggest the role of internet use, renewable energy and services trade in sustainable development in G20 countries.

• 한국운동역학회지
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• 제20권4호
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• pp.447-455
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• 2010

The objective of this study was to analyze the difference in kinematic variables for successful and unsuccessful golf putting strokes. The study population included 8 male secondary school golf players who had played golf for over 3 years and whose handicap was 4 or lower. A hole was made on a 5-m-long artificial flat mat for practice, and an environment similar to that of a real green was created. The participants' motions were analyzed through 3D image analysis, and the difference in kinematic variables for successful and unsuccessful putting strokes in the same direction was determined. Data analysis revealed the following findings: The time spent for a segment of putting was the greatest for the backswing segment for both successful and unsuccessful strokes. During address and impact, the both changed to a larger extent. For successful putting strokes, the change in the elbow angle during the downswing was greater for the right elbow than for the left elbow. For both successful and unsuccessful putting strokes, the left shoulder angle increased during the segment from address to the turning point and decreased during the segment from the turning point to impact. In contrast, the right shoulder angle significantly differed between successful and unsuccessful putting strokes only during address. During successful and unsuccessful motions, the swing was executed with the moving displacement of the X-axis of the club head maintained almost constant along a straight light without back and forth movement. In the backswing segment, moving displacement of the Y- and Z-axes was greater in successful strokes than in unsuccessful strokes; however, this difference was very small for the Y-axis. The velocity of the club head for successful and unsuccessful motions significantly differed during address and at the turning point. The highest velocity of the ball was greater for successful than for unsuccessful putting strokes.

• 한국정밀공학회지
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• 제27권4호
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• pp.20-26
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• 2010

Any relative deformation between the cutting tool and the workpiece at the machining point, results directly in form and dimensional errors. The source of relative deformations between the cutting tool and the workpiece at the contact point may be due to thermal, weight, and cutting forces. This paper presents an investigation into dry and fluid machining with the objective of evaluating shape accuracy effect for the turning process of Al6061. The thermal distribution of cutting tool and cutting force was predicted using finite element method after measuring the temperature of the tool holder. To reach this goal, shape accuracy turning experiments are carried out according to cutting conditions with dry and fluid machining methods. The variable cutting conditions are cutting speed, depth of cutting and feed rate.

• 한국과학예술포럼
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• 제34권
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• pp.275-290
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• 2018

해당 연구는 극장용 애니메이션을 서사를 중심으로 갈등을 분석하기 위해 영상에서 갈등을 분류하는 객관적이고 타당한 방법이 필요함을 인식하면서 시작되었다. 아울러 갈등을 효과적으로 비주얼 스토리텔링 하는 요소로 주인공의 정서에 주목하고, 갈등에서 나타나는 주인공의 정서를 연구하려 한다. 연구의 목적은 갈등강도와 갈등에 나타나는 정서를 분석하는 것이다. 연구결과 및 내용은 다음과 같다. 첫째, 서사의 이론적 고찰을 통해 극적전환점을 찾아내고, 갈등 분류 모델(Conflict 6B Model)을 제안하였다. 둘째, 갈등 분류 모델을 이용하여 이론에 기반한 갈등 샷(shot) DB를 추출하였다. 셋째, 내적, 초개인적 갈등에서 강도와 정서를 찾아내었다. 넷째, 내적, 초개인적 갈등에서 강도와 정서의 전문가 실험 및 검증을 실시하였다. 본 연구는 애니메이션에서 갈등에 대한 주인공 정서의 서사적, 시각적, 심리학적인 다학제적 연구로 추출된 메타데이터(Metadata)는 애니메이션 서사에서 갈등의 비데오 인덱싱(Video Indexing)에 적용 될 것으로 기대한다.

• 한국가시화정보학회지
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• 제15권2호
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• pp.33-40
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• 2017

Abstract In the present study, the characteristics of kinematics and dynamics in the fluttering motion of free-falling plates are investigated at Reynolds number of $10^5$. We record quasi-two-dimensional trajectories of free-falling plates with and without superhydrophobic coating using high-speed camera, and compute the drag and lift forces by trajectory analysis. Translational and angular velocities are modeled as harmonic functions with specific phase differences. In particular, periodic mass elevations near turning points are explained using the suggested models. At each turning point, a sudden drop in lift and a rapid increase in drag occur simultaneously due to fast increase in angle of attack. However, the lift is increased over the buoyancy-corrected weight of plate during gliding flight, resulting in periodic mass elevations near turning points. Superhydrophobicity is shown to increase lift but to reduce drag on a fluttering plate, resulting in the decrease of mean descent speed.

• 천문학회보
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• 제42권1호
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• pp.57.3-58
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• 2017

Single Point Diamond Turning (SPDT) is a cost-effective technique to fabricate metallic mirrors. In particular, the servo-assisted diamond turning option is highly useful for the fabrication of freeform surfaces. However, the SPDT process leaves periodic tool marks on machined mirror surfaces, leading to undesirable diffraction effect, as well as the deviation of input beam. In order to solve this problem, we propose new SPDT machining conditions to minimize tool marks. We will also show the results from optical measurement and Power Spectral Density (PSD) analysis to evaluate the expectable performance for applications in wide field infrared telescopes.

• 보건의료생명과학 논문지
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• 제9권2호
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• pp.317-326
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• 2021

본 연구는 구술자료 분석을 통해 이혼을 경험한 여성 정신장애인의 삶을 보다 깊이 이해하고 치유적 방안을 도출하는데 목적을 두었다. 연구에는 우울증과 공황장애 진단을 받은 여성정신장애인이 참여하였으며 생애사 분석을 위한 텍스트는 구술자료 인터뷰로 구성했다. 텍스트는 Mandelbaum(1973)이 제안한 생애사 분석틀에 의거하여 '삶의 영역', '전환점', '적응'의 3가지 개념틀로 분석했다. 자료분석 결과 '삶의 영역'은 "버려진 아이", "정신질환 발병", "종교", "범죄"로 분석했다. '전환점' 분석에서는 "이혼", "생이별"로 분석했으며, '적응'은 "합리화"로 도출됐다. 이러한 연구결과에 근거하여 이혼을 경험한 여성 정신장애인의 삶의 치유적 개입 방안을 제안했다.

• Steel and Composite Structures
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• 제34권5호
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• pp.681-698
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• 2020

The paper addresses contribution to the modeling and optimization of major machinability parameters (cutting force, surface roughness, and tool wear) in finish dry hard turning (FDHT) for machinability evaluation of hardened AISI grade die steel D₃ with PVD-TiN coated (Al₂O₃-TiCN) mixed ceramic tool insert. The turning trials are performed based on Taguchi's L₁₈ orthogonal array design of experiments for the development of regression model as well as adequate model prediction by considering tool approach angle, nose radius, cutting speed, feed rate, and depth of cut as major machining parameters. The models or correlations are developed by employing multiple regression analysis (MRA). In addition, statistical technique (response surface methodology) followed by computational approaches (genetic algorithm and particle swarm optimization) have been employed for multiple response optimization. Thereafter, the effectiveness of proposed three (RSM, GA, PSO) optimization techniques are evaluated by confirmation test and subsequently the best optimization results have been used for estimation of energy consumption which includes savings of carbon footprint towards green machining and for tool life estimation followed by cost analysis to justify the economic feasibility of PVD-TiN coated Al₂O₃+TiCN mixed ceramic tool in FDHT operation. Finally, estimation of energy savings, economic analysis, and sustainability assessment are performed by employing carbon footprint analysis, Gilbert approach, and Pugh matrix, respectively. Novelty aspects, the present work: (i) contributes to practical industrial application of finish hard turning for the shaft and die makers to select the optimum cutting conditions in a range of hardness of 45-60 HRC, (ii) demonstrates the replacement of expensive, time-consuming conventional cylindrical grinding process and proposes the alternative of costlier CBN tool by utilizing ceramic tool in hard turning processes considering technological, economical and ecological aspects, which are helpful and efficient from industrial point of view, (iii) provides environment friendliness, cleaner production for machining of hardened steels, (iv) helps to improve the desirable machinability characteristics, and (v) serves as a knowledge for the development of a common language for sustainable manufacturing in both research field and industrial practice.

• 한국실내디자인학회논문집
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• 제25권4호
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• pp.98-104
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• 2016

The study explores, by carrying out literature review (theoretical pursuit) and case analysis (practical works), the changed point of view on the European war memorial/museum, the revolution of museography and its paradigm, the case analysis of war memorial/museum in the paradigm shift, the new point of view and its role. Through the theoretical thinking and the case analysis, it concludes that the exhibition space of war memorial/museum, which is in the center of material culture, is turning into the venue of societal culture. Ultimately, it aims at indicating the necessity of the paradigm shift, and offering the exhibition design strategy and technique which can better display the objects - remains - of the terrible war and the importance of peace for the old generation and the future generation.

• 한국콘텐츠학회논문지
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• 제20권1호
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• pp.505-518
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• 2020

본 연구는 단주과정에 있는 여성의 자기실현에 관한 생애사 연구이다. 연구의 목적은 여성 알코올 중독에 관한 정황들을 탐색하여 치료 및 회복을 위한 논의의 지평을 확장시키고 사회복지적인 개입방안을 제시하는데 있다. 이를 위해 7년 이상 단주 중인 여성 알코올 중독 회복자가 참여했으며, 생애사 분석을 위한 텍스트는 Mandelbaum이 제안한 생애사 분석틀에 의거하여 '삶의 영역', '전환점', '적응'으로 나눴다. 자료분석 결과 <삶의 영역>은 '개인적인 삶의 차원', '자족차원의 삶의 차원', '사회적인 삶의 차원'의 총 3개의 영역으로 분석되었다. <전환점>은 '술을 마시고 폭력을 행사하는 아버지로부터 탈출', '상사의 폭행을 피해 직장을 포기함', 'AA(단주 자조모임) 참여로 서서히 치유의 길을 걸어감'으로 드러났다. <적응>은 '공부를 잘하는 적응전략', '술을 마심으로써 분노를 삭이는 적응전략', 'AA로의 의탁과 자기실현을 생각하는 적응전략' 으로 도출되었다. 이러한 연구결과를 바탕으로 자기실현에 입각한 사회복지 실천 및 정책 차원의 논의를 제시하였다.