급속응고한 Al-Mg 합금의 미세조직 및 인장특성에 미치는 첨가원소의 영향

박현호,박종성,김명호 ( Hyun Ho Park,Chong Sung Park,Myung Ho Kim ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4

N/A In order to study effects of Cu and lie on the microstructure and tensile properties of rapidly solidified Al-Mg alloys, Al-Mg-Cu-Be alloys have been rapidly solidified by inert gas atomization process. Microstructure of rapidly solidified Al-Mg-Cu-Be powders exhibited refinement and good dispersion of Be particles as increasing of solidification rate. Solidification rate of atomized powders was estimated to be about 5 × 10^(3n)C/s. Inert gas atomized Al-Mg-Cu-Be powders were hot-processed by vacuum hot pressing at 450℃ under 100 MPa and hot extruded with reduction ratio in area of 251 at 450℃. The extruded Al-Mg-Cu-Be. powders consisted of recrystallized fine A1 grains and homogeneously dispersed fine Be particles, and exhibited improved tensile properties with increase in Cu content. Al₂CuMg compounds precipitated in grain and grain boundaries of Al-Mg-Cu-Be alloys with aging heat treatment after solution treatment. Hardness and tensile properties were improved by increasing Cu content and Be addition. Compared with extruded Al-Mg-Cu powders, the extruded Al-Mg-Cu-Be powders exhibited finer recrystallized grains and improved tensile properties by dispersion hardening of Be and subgrain boundaries pinned by fine Be particles. After aging treatment, hardness and tensile properties were improved due to restricted precipitation by increasing of dislocation density around Be particles in matrix.

VaRTM 공법에 의한 토목용 하이브리드 섬유강화 복합재료의 제조 및 물성에 관한 연구

박현호,최현석,이정희,최혜원,권영태,강한나,이양헌,강영아,Park, Hyun Ho,Choi, Hyun Seok,Lee, Jeong Hee,Choi, Hye Won,Kwon, Young Tea,Gang, Han-Na,Lee, Yang Hun,Kang, Young Ah 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.3

A three-dimensional spacer knitted fabric (3D fabric) consisting of ultra-high molecular weight polyethylene (UHMWPE) fibers and polyethylene terephthalate (PET) monofilaments (used for ground surfaces and pile yarn) with a ratio of 80% and 20% by volume, respectively, was produced in a Raschel machine with two needle bars. A 3D fiber-reinforced plastic (3D FRP), with cylindrical holes of 20 mm and 28 mm diameter was produced by the vacuum-assisted resin transfer molding (VaRTM) method, with a 3D fabric as a reinforcement and an unsaturated polyester resin as a matrix. Milled carbon fiber particles (CP), with a diameter of $100{\mu}m$, were added into the resin as sub-reinforcement. The mechanical properties of the obtained FRPs were investigated. The apparent space fraction of the prepared 3D FRP was estimated to be approximately 47.1% (which should be a light-weight structure) and the reinforcement-to-matrix weight ratio can reach approximately 60% or more. With regard to the tensile properties of the 3D FRP, tensile strength is higher in the wale of the fabric, while elongation is higher in the course. For 3D-CP/FRP produced with 0, 5, and 10 wt% in CP content, increasing the CP content in 3D FRP makes its decomposition temperature higher and increases its storage modulus to 10 times above the higher temperature range compared to glass transition. Flexural properties and abrasion resistance are improved as the CP content in FRPs increases.

고온전단분쇄기술을 이용한 재생/신재 EPDM 고무 블렌드물의 특성

박현호,이창섭,나성택,Park, Hyun-Ho,Lee, Chang-Seop,Na, Seong-Toek 대한화학회 2005 대한화학회지 Vol.49 No.4

승용차의 측면 충돌시 승객 상해치 평가에 관한 연구

박현호(Park Hyun-Ho) 한국자동차공학회 1995 한국자동차공학회 학술강연초록집 Vol.- No.-

주한재외공관 경찰안티드론체계 구축 및 법·제도 개선 방안

박현호 ( Park Hyun-ho ),김찬선 ( Kim Chan-sun ),윤태관 ( Yoon Tae-gwan ),이영오 ( Lee Young-oh ) 한국안전문화연구원 2020 현대사회와 안전문화 Vol.3 No.2

연구필요성: 본 연구는 주한재외공관 경찰안티드론체계 구축 및 법·제도 개선 방안을 모색하는데 연구의 필요성이 있다. 연구방법: 본 연구에서는 주한재외공관과 관련된 선행연구를 중심으로 문헌고찰방법과 질문지를 이용한 질적연구방법을 적용하여 수행하였다. 질문지는 2019년 11월 11일∼11월 25일까지 약 15일간 실시하였다. 드론 및 사회안전분야에서 종사 경력 약 10년 이상의 대상으로 설정하였으며, 총 참가 인원은 10명이다. 결론: 주한재외공관 경찰안티드론체계 구축 및 법·제도 개선 방안을 중심으로 도출한 결론은 다음과 같다. 첫째, 주한재외공관 드론테러 발생 시 국가적인 위상은 현저히 저하될 것으로 예측된다. 위상저하의 주된 내용으로는 법적 외교문제와 보상, 국내 안티드론 기술수준 신뢰도 저하, 국가 안전체계에 대한 신뢰도 저하, 국제 외교관계 기능성 저하 등의 내용이 도출되었다. 둘째, 주한재외공관에 대한 경찰안티드론체계 구축방식은 통합 안티드론시스템 구축, 민간경비 아웃소싱 구축, 법·제도 및 규제 강화 등의 방안이 도출되었다. 셋째, 경찰안티드론체계 구축 시 법·제도적 개선점으로 드론 상용화를 위한 현실적인 경찰법의 정비, 현실성있는 통신전파법의 개정, 통신전파법 위반시 강력한 처벌 강화, 재외공관 국가 중요시설 지정 등의 법·제도적 개선점이 도출되었다. Pupose: This study is necessary to establish a police anti-ron system for diplomatic missions abroad and to find ways to improve laws and systems. Method: In this study, a literature review method and a qualitative research method using questionnaires were applied, focusing on previous studies related to diplomatic missions in Korea. The questionnaire was conducted from November 11 to November 25, 2019 for about 15 days. It was set to targets with more than 10 years of experience in drones and social safety, and the total number of participants is 10. Result: The conclusions drawn centering on the establishment of the police anti-ron system for diplomatic missions in Korea and the improvement of laws and systems are as follows. First, in the event of a drone terror at the diplomatic mission in Korea, it is predicted that the national status will be significantly lowered. The main contents of the decline in status were legal diplomatic issues and compensation, a decrease in the reliability of the domestic anti-drone technology level, a decrease in the reliability of the national safety system, and a decrease in the functionality of international diplomatic relations. Second, as for the method of establishing the police antidrone system for diplomatic missions abroad, measures such as establishment of an integrated anti-drone system, establishment of outsourcing of private security, and strengthening of laws, systems and regulations were derived. Third, legal and institutional improvements in the establishment of the police antidron system include the improvement of the realistic police law for the commercialization of drones, the amendment of the realistic communication propagation law, reinforcement of strong penalties for violating the communication propagation law, and designation of important national facilities for diplomatic missions abroad. Was derived.

분산형전원이 연계된 배전선로에서 선로전압강하보상장치의 활용에 따른 효과 분석

박현호(Park Hyun-Ho),윤상윤(Yun Sang-Yun),안선주(Ahn Seon-Ju),최준호(Choi Joon-Ho),고석일(Go Seok-Il) 대한전기학회 2024 대한전기학회 학술대회 논문집 Vol.2024 No.7

COVID-19 펜데믹에 대한 시민들의 인식도 분석: 국가 정책방향을 중심으로

박현호 ( Park¸ Hyun-ho ),류길호 ( Ryu¸ Gil-ho ) 미래융합통섭학회 2021 현대사회와 안전문화 Vol.4 No.2

연구목적 본 연구는 COVID-19 펜데믹에 대해 국가 정책방향을 중심으로 시민들의 인식도를 분석하는데 연구의 목적이 있다. 연구방법 이 연구의 목적은 COVID-19 펜데믹에 대한 시민들의 인식을 알아보기 위하여 2020년 5월 1일부터 10월 30일까지 6개월간 서울특별시를 5개 권역으로 구분하여 조사하였다. 결과 첫째, 코로나-19의 발생 원인에 대해 물어본 결과 ‘생화학실험’이 가장 높게 나타났다. 둘째, 대한민국의 코로나-19 예방 활동에 대해 물어본 결과 ‘다소늦게대처’가 가장 높게 나타났다. 셋째, 코로나-19 발생이 대한민국에 미치는 영향에 대해 물어본 결과 ‘전분야에 치명적 영향’이 가장 높게 나타났다. 넷째, 코로나-19 장기화로 인한 국제사회에 미치는 영향에 대해 물어본 결과 ‘무역전쟁심화’가 가장 높게 나타났다. 결론 사스, 메르스, COVID-19와 같은 재난 상황은 미래사회에서는 일상화 될 것이다. 이에 대비하여 의료전문가 툴구성, 현실 가능한 매뉴얼 보완, 국내외 생화학 등 바이러스 공공연구, 지구촌 공동대응체계가 필요하다. PURPOSE The main purpose of Analysis of Public Perception toward COVID-19 pandemic with a focus on the national policy direction. METHODS In order to achieve the purpose of this study, Seoul was divided into 5 districts and surveyed for 6 months from May 1 to October 30, 2020 to find out the public's perception of the COVID-19 pandemic. RESULTS Firstly, "biochemical test" is the most highly appeared as the result for the asking the causes of COVID-19, Secondly, the prevention of COVID- 19 in Korea Activities "somewhat late action" is the most highly appeared for the result., Thirdly, as the result of asking about the impact of the COVID- 19 outbreak on Korea, ' fatal impact on all fields ' was found to be the highest, Fourthly, "intensifying trade war' is the most highly appeared as the result of asking about the impact of prolonged COVID-19 to the international community. CONCLUSION Disaster situations such as SARS, MERS, and COVID-19 will become commonplace in the future society. In preparation for this, it is necessary to organize the tools of medical experts, to supplement realistic manuals, to conduct public research on viruses such as domestic and foreign biochemistry, and to jointly respond to the global community.

고온전단분쇄기술을 이용한 재생/신재 니트릴고무(NBR) 블렌드물의 가황거동 및 물리적 특성

박현호 ( Hyun Ho Park ),김준형 ( Joon Hyung Kim ),이창섭 ( Chang Seop Lee ),나성택 ( Seong Taek Na ) 한국공업화학회 2005 공업화학 Vol.16 No.6

EPDM/POSS(Polyhedral oligomeric silsesquioxane) 복합재료의 물성 연구

박현호 ( Hyun-ho Park ) 한국공업화학회 2021 공업화학 Vol.32 No.4

다면체 올리고머 실세스퀴옥산 (POSS) 중 케이지 형태 8개의 아크릴레이트 그룹을 포함하는 POSS가 에틸렌-프로필렌-디엔고무 (EPDM) 과산화물 가교에서의 가교 거동, 기계적 특성에 미치는 영향 및 열 안정성 등을 조사하였다. 고무 100 phr당 0~12 phr의 POSS를 함량 별로 혼합하고 과산화물 가교제를 첨가하여 EPDM/POSS 복합재료를 만들었다. 가교 특성 결과 POSS의 아크릴레이트 그룹이 과산화물에 의해 활성화 되었고, 과산화물 가교 효율을 향상시키는 것으로 나타났다. EPDM/POSS 복합재료에서 POSS의 분산안정성은 떨어졌지만, 복합재료의 파단 강도, 신장률 및 열 안정성은 향상되었다. The crosslinking behavior of polyhedral oligomeric silsesquioxane (POSS) containing eight acrylate groups in a cage form in ethylene-propylene-diene rubber (EPDM) peroxide crosslinking, the effect on mechanical properties, and the thermal stability were investigated. An EPDM/POSS composite material was prepared by mixing 0 to 12 parts per hundreds of rubber (phr) of POSS per 100 phr of rubber by content and adding a peroxide crosslinking agent. As a result of crosslinking properties, it was found that the acrylate group of POSS was activated by peroxide and improved the peroxide crosslinking efficiency. Although the dispersion stability of POSS in EPDM/POSS composites was poor, the fracture strength, elongation and thermal stability were improved.

배전계통에서 전압추정을 위한 AMI 데이터 적용방안에 대한 연구

박현호(Hyun-ho Park),조건익(Kun-yik Jo),심관식(Gwan-sic Sim),고석일(Seok-il Go),최준호(Joon-ho Choi) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.10