고망간강 플랜지의 열간 단조 후 냉각방법에 따른 미세조직 및 기계적 특성 평가

박민하,이강호,김병준,김병구 한국재료학회 2024 한국재료학회지 Vol.34 No.1

High-Manganese (Mn) austenitic steel, with over 24 wt% Mn content, offers outstanding mechanical properties in cryogenic settings, making it a potential replacement for existing cryogenic materials. This high manganese steel exhibits high strength, ductility, and wear resistance, making it promising for applications like LNG tanks, flanges, and valves. To operate in cryogenic environments, hot forging and heat treatment processes are vital, especially in flange production. The cooling rate during high-temperature cooling after hot forging plays a critical role in influencing the microstructure and mechanical properties of high manganese steel. The rate at which cooling occurs during this process influences the size of the grains and the distribution of manganese and consequently has an impact on mechanical properties. This study assessed the microstructure and mechanical properties based on different cooling rates during the hot forging of High-Mn steel flanges. Comparing air and water cooling after hot forging, followed by heat treatment, revealed notable differences in grain size. These differences directly impacted mechanical properties such as tensile strength, hardness, and Charpy impact property. Understanding these effects is crucial for optimizing the performance and reliability of High-Mn steel in cryogenic applications.

수도권 특별법 관리권역내 행정지역별 오염도 분석

박민하,홍지형,송학,김대곤,김정수,이대균 한국대기환경학회 2005 한국대기환경학회 학술대회논문집 Vol.- No.-

‘홍대앞’ 장소성의 재구성에 관한 연구

박민하 국제지역학회 2018 국제지역학회 춘계학술대회 Vol.2018 No.-

홍대앞 사례를 통한 문화적 포용성 개념의 적용

박민하,이병민 한국경제지리학회 2019 한국경제지리학회지 Vol.22 No.4

This study suggests a conceptualization model of ‘cultural inclusiveness’ organically connected to social inclusiveness, by expanding the implications of urban inclusiveness to the domain and relationship. Based on the process of necessity of relation, connection of space, and execution of act, the cultural inclusiveness could be connected to the formation of organic/learning relation, the creation of openness focusing on public space, and the practice of diverse subjects. Concretely, the concept of cultural inclusiveness is applied to the case of ‘Hongdae-ap’. The recent Hongdae-ap is showing the value of coexistence such as the establishment of environment that could protect the diversity of individual subjects and groups(artists, residents, government officials, students, cultural activists, citizens, tourists, and etc.), the formation of public space such as ‘Hongdae-up playground’, ‘pedestrian-friendly street’, and ‘Gyeongui- Line book street’, social network service & horizontal network, and access. 본 연구는 도시 포용성의 함의를 영역성과 함께 관계성을 더해 확장하여, 사회적 포용성과 유기적으로 연계되는 ‘문화적 포용성’의 개념화 모델을 제시한다. 문화적 포용성은 관계의 필요와 공간의 연결, 행위를 통한 실행의 과정을 바탕으로 유기적·학습 관계의 형성 및 공적 공간을 중심으로 한 개방성의 창출, 다양한 주체의 실천으로 연계될수 있다. 구체적으로는 문화적 포용성의 개념을 ‘홍대앞’ 사례에 적용한다. 최근 홍대앞은 개별 주체 및 그룹·집단들(예술가, 주민, 관, 학생, 문화 활동가, 시민, 관광객 등)의 다양성을 보호할 수 있는 환경 조성, ‘홍대앞 놀이터’, ‘걷고싶은 거리’, ‘경의선 책거리’ 등의 공적 공간 형성, 소셜 네트워크 서비스 및 수평적인 관계망, 접속 등의 요소가 공존의가치로 나타나고 있다.

황사/비황사의 입자 조성 변화 : 1993~1996년 봄철 고산 측정자료 ( Aerosol Composition Change due to Yellow Dust : Springtime Measurement Data between 1993 and 1996 at Kosan )

박민하,김용표,강창희 한국대기환경학회 2001 한국대기환경학회지 Vol.17 No.6

고산에서 측정한 TSP 농도 특성: 통계적 해석

박민하,김용표,강창희,김원형 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.1

수도권 대기오염물질 배출권거래제에 대한 고찰 및 총량제 확대 시행을 위한 제언

박민하,김용표,Park, Min Ha,Kim, Yong Pyo 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.4

The cap-and-trade system against the air pollutants in the Seoul Metropolitan Area (SMA), Korea has been implemented since 2008 and will be implemented other areas in Korea on 2020. In this study, to identify the outcome and effectiveness of the cap-and-trade system in the SMA, (1) the rate of change for NOx and SOx emissions, (2) differences between the real emission and allocated amount, and (3) the status of trading are reviewed. It was found that the NOx and SOx emissions from the sources under the cap-and-trade system decreased in the SMA but the reduction was mainly due to the reduction of fuel usage not related to the system. It was found that the average percentage of annual emission in the SMA to the allocated amount between 2008 and 2018 was 66.9% for NOx and 69.3% for SOx, respectively. It suggests that there was over allocation of the emission amounts. The average trading prices in the SMA were 0.193 $/kg for NOx and 0.128 $/kg for SOx, far lower than those in RECLAIM, 131.942 $/kg and 81.677 $/kg, respectively. It was suggested that (1) the cap system for NOx and SOx emissions should be implemented only for the area with high emission ratio from large point sources, (2) the trade system is not suitable for the effective implementation of the cap system, and (3) Korean government should not allow over allocation in order to ensure sound market function without delaying the introduction of technology.

비해염 황산염에 대한 질산염의 비로 살펴본 대기오염물질의 변화: 1992~1999년 고산 측정자료

박민하,김용표,강창희 한국대기환경학회 2002 한국대기환경학회지 Vol.18 No.3

문화예술교육 일상화의 개념적 확장과 적용

박민하(Park Min Ha),이병민(Lee Byung min) 인문콘텐츠학회 2016 인문콘텐츠 Vol.0 No.41

최근 문화예술교육은 사회적 취약계층 뿐만 아니라 누구나 문화예술교육을 누릴 수 있어야 한다는 일상화의 흐름이 촉발되었다. ‘문화예술교육의 일상화, 지역화, 내실화’를 비전으로 제시하여 현실적인 필요성이 강조되고 있다. 그러나 정책적 확산에 비해 이를 뒷받침 할 수 있는 이론적인 연구는 이루어지지 않고 있는 실정이다. 실제 삶의 영역과 밀접하게 맞닿아 있는 개념이 ‘일상’이지만 접근성 중심의 확대전략으로 다루어지고 있다. 이에 본 논문은 ‘일상’에 대한 고찰을 통해 문화예술교육 일상화의 개념적 확장을 시도하였다. 일상은 반복적이고, 평범하고, 익숙한 경험을 의미하기도 하지만, 동시에 인간이 주체적인 모습으로 사회적인 상호작용을 거듭하는 경험의 공간이다. 확장된 문화예술교육 일상화에서는 일상이라는 공간적 차원에서 문화예술교육이 뿌리내릴 수 있는 것에 일상의 가치를 두어야 한다. 정서적인 일상의 환기, 물리적인 제약을 넘어서는 경험, 타인과 함께하는 경험이라는 콘텐츠의 속성이 중요하고, 궁극적으로 경험 공유를 통한 연대에 목적이 있음을 제시하였다. 자연스럽게 삶에 대한 의미를 넓혀나갈 수 있는 총체적인 과정으로서 이해되어야 할 것이다. 이러한 개념적 가능성을 확인하기 위하여 생활밀착형 콘텐츠 사례에 해당하는 〈움직이는 예술정거장〉에 적용하여 살펴보았다. 이를 바탕으로 문화예술교육 일상화가 보다 공감을 이루고 확산하는 데에 기여할 수 있는 향후 방향을 모색하였다. Recently the stream of popularization that anyone as well as social vulnerable class can enjoy culture and art education was precipitated. As ‘popularization, localization, substantiality of culture and art education’ is suggested for visions, realistic necessity is being emphasized accordingly. However, theoretical researchers which back up it have not been achieved actually compared to policy expansion. Though the concept of closely contacting with the scope of real life is ‘popularization,’ it is being dealt with as expansion strategies centering on accessibility. Therefore, this study tried conceptual expansion of popularized culture and art education. Daily life is repeated and means usual, familiar experiences, but it is the experience space which repeats social interactions with subjective figures by humans at the same time. In popularization of expanded culture and art education, the value of daily life shall be laid in enrooting culture and art education from spatial dimensions called daily life. This study suggested that experiences exceeding ventilation of emotional daily life and physical restrictions together with contents properties called experiences of joining with others were important, and they aimed at solidarity by sharing experiences ultimately. They have to be understood as total processes which could widen the meaning of life naturally. In order to confirm such conceptual possibility, reviews were made by applying it to <Moving Art Station> which corresponded to a case of daily- life oriented contents. Based on the result, this study groped the future direction so that popularization of culture and art education could contribute to achieving more sympathy and doing expansion.

레트로와 뉴트로 경향의 여성 헤어스타일 특성 비교

박민하 ( Min-ha Park ),이지연 ( Ji-yeon Lee ),소영진 ( Young-jin So ) 한국미용학회 2020 한국미용학회지 Vol.26 No.5

The purpose of this study is to analyze retro and neutro hairstyle designs and investigate differences in characteristics. Photo data was collected and analyzed from April 27 to May 11, 2020 through Internet search. As a result of this study, retro hairstyles mean reproduce past styles, and the main subject of style is the nostalgia and nostalgia based on the nostalgia experienced by people in their 40s and 50s. On the other hand, Neutro Hair Styling gives meaning to the reinterpretation of past styles, and the main subject of style is in her 20s. They are pursuing publicity, fun, and marketing through hairstyle reproduction based on unfamiliarity they have not experienced before.