앞다리굽이관절내골절 3증례

황현민,서범석 로얄에이알씨 주식회사 2008 로얄동물임상의학 Vol.6 No.3

성장판 조기폐쇄에 따른 요척골 변형과 앞다리굽이관절의 유합부전

황현민 로얄에이알씨 주식회사 2010 로얄동물임상의학 Vol.8 No.3

무릎골 탈구 진단과 치료

황현민 로얄에이알씨 주식회사 2010 로얄동물임상의학 Vol.8 No.1

임상에서 가장 흔하게 볼 수 있는 무릎골 탈구에 대한 의구심은 여러 가지로 나열될 수 있다. 왜 발생하는가. 정말 수술적 교정은 효과가 있는가. 골관절염은 수술로 치유될 수 있는가. 어떤 치료법이 이상적인 치료법이 될 수 있을까. 임상가라면 무릎골 탈구에 대해 고민 해보았을 법하다. 하지만 여러 책들과 문헌에 나누어 실린 답들을 한 번에 알기는 매우 어렵고 어떤 치료법이 개별 환자에 적절한 치료법인지 확인이 불가하다. 많은 저자들이 가장 효과적인 무릎골 탈구의 교정 방법으로 생각하고 있는 방법은 경골조면 이동술과 block recession 그리고 내외측 지대(retinaculum) 교정술이다. 이 방법을 이용하여 최근 수술의 성공률이 매우 높아졌다. 그런데 모든 환자에 이러한 시술이 모두 적절한 것은 아니다. 개에서는 75%이상의 내측 탈구이고, 25%이하가 외측 탈구이다. 고양이도 이환될 수 있으나 이환율은 개보다 명확히 작다. 내측 무릎골 탈구는 Toy나 Miniature 품종에서 흔하게 발생하는 선천성 질환이다. 암컷이 수컷보다 호발하는 Pomeranian, Pekingese, Chihuahua와 Boston terrier등이 알려져 있다. 하지만 대형견종에서도 크기에 상관없이 내측 무릎골 탈구가 외측 무릎골 탈구보다 빈번하게 발생한다. 때로는 내측과 외측 양측성 무릎골 탈구가 같은 슬관절에서 발생할 수도 있다. 무릎골 내탈구는 개에서 95%이상 구조이상과 관련되어 발생한다. 무릎골 내외탈구의 수술적 치료에 대한 가장 큰 불만은 탈구의 재발이다. 이 개들의 18~29%에서 수술에 대한 불만이 있으며 20㎏ 이상의 대형견에서는 더 많이 발생하고 있다. 수술 후 발생한 불만 중 65~86%는 무릎골의 재탈구이다. 이러한 문제점의 가장 큰 문제점은 부적절한 무릎골 탈구의 진단과 치료에 있다.

개에서 발생한 척수질환에 대한 추적조사(70예)

황현민,이재연,지현철,이영원,최호정,박성준,김명철,정성목 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2006 動物醫科學硏究誌 Vol.14 No.-

This study was performed to evaluate the prevalence of spinal disorders in dogs, as well as their breed, age, gender and body weight distributions. Seventy cases of caine spinal disoreders presented in the period 2001 and 2006 were reviewed. The diagnosis was obtained by survey radiographs, myelogram, CSF analysis, CT and MRI. The most frequent breed was Maltese(15 cases), and followed by Yorkshire Terrier (10 cases), Pekingese (9 cases). Canine spinal disorders occurred from 7 month to 17 year old dog, mean age was 5.3±3.7 year-old. Canine spinal disorders occurred more often in females(59.7%) than males. Mean body weight was 5.87±7.02 kg. Degenerative (39 cases, 43.3%) and anomalous (24 cases, 26.7%) disorders were dominant in 90 specific disease distribution. This results can be a reference data for the further study.

Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors

황현민,주필재,강문성,안국문,한중탁,김병수,임호선,조정호 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.4

Review of pollutants in urban road dust: Part II. Organic contaminants from vehicles and road management

황현민,Matthew J. Fiala,Terry L. Wade,박동주 서울시립대학교 도시과학연구원 2019 도시과학국제저널 Vol.23 No.4

Urban road dust is highly enriched with organic pollutants such as polycyclic aromatic hydrocarbons (PAHs), petroleum hydrocarbons, and herbicides that are released primarily from vehicles and/or road management practices. Analysis of sediment cores from urban watersheds clearly demonstrates that increase of pollutant input correlates with traffic volume increase. Pollutants in urban road dust are a significant threat to the health of aquatic organisms. Contaminated urban road dust is mobilized by stormwater runoff and transported into local receiving waterbodies (e.g. streams, rivers, lakes, and estuaries). Concentrations of PAHs in sediments receiving stormwater runoff from densely populated urban areas are high enough to impair the health of aquatic organisms and frequently exceed sediment quality guidelines. To restore streams and rivers impaired by roadway runoff, concentrations of pollutants in road dust need to be reduced through implementing a combination of regulatory policies and management actions. One approach would be to phase out existing pollutant sources such instituting a ban on the use of coal tar-based asphalt road seal coat containing high levels of PAHs. Instituting the use of environment friendly natural herbicides with only spot treatment to target weeds rather than broadcast application and restoration of native vegetation, as integrated roadside vegetation management programs. Adoption of these practices would result in significantly reduced herbicide contamination of roadway stormwater runoff. An alternate option is the removal of contaminants from stormwater runoff before they are delivered to receiving waterbodies using best management practices (BMP) such as retention ponds, detention basins, and grass swales. In densely populated urban areas, however, these BMPs may not be easily adopted due to multiple constraints such as lack of spaces and high land cost. In this case, proprietary BMPs such as media filter, wet vault, and vortex separator, which are also known as manufactured treatment devices, can be considered.

Review of pollutants in urban road dust and stormwater runoff: part 1. Heavy metals released from vehicles

황현민,Matthew J. Fiala,박동주,Terry L. Wade 서울시립대학교 도시과학연구원 2016 도시과학국제저널 Vol.20 No.4

Urban road dust can be highly enriched with trace metals such as copper, lead, zinc, and platinum group elements (PGEs) that are released primarily from vehicles. Concentrations of these metals are up to about 100 times higher than background levels. Lead concentrations in sediment core have declined dramatically due to phase out of leaded gasoline. Recent ban on the use of lead wheel balancing weight in Europe and in some US states will accelerate the decline of lead in the environment. Concentrations of copper, zinc, and PGEs in sediments in many urban areas have increased continuously due to increase of urban sprawl and increased numbers and travel distance of vehicle. Wear of brake pads and tyres are the primary sources of copper and zinc in urban road dust. PGEs have been released from catalytic converters since the mid-1970s. Contaminated urban road dust is picked up by stormwater runoff and delivered into local receiving waterbodies (e.g. streams, rivers, lakes, and estuaries). Concentrations of these metals in waterbodies and sediments receiving stormwater runoff from densely populated urban areas are high enough to impair the health of aquatic organisms and frequently exceed water quality criteria and sediment quality guidelines. In order to improve the quality of urban waterbodies, legal regulations are necessary to reduce release of toxic metals from vehicle use as demonstrated in the case of lead in gasoline. Recent regulations and agreement to reduce copper content in brake pads to 0.5% by 2026 in the USA should result in significant reduction of copper entering urban watersheds. A less optimal option is removal of suspended sediments from stormwater runoff before they enter receiving waterbodies using best management practices such as retention ponds, detention basins, and grass swales.

준 일차원 다상 반응유동 기법을 이용한 케로신/과산화수소 액체 핀틀 추력기 성능특성 연구

황현민(Hyeonmin Hwang),강정석(Jeongseok Kang),성홍계(Hong-Gye Sung),권민찬(Minchan Kwon),양준서(Junseo Yang) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12

액체 핀틀 추력기의 내부 물리현상을 자세히 구현하면서 다양한 성능해석을 할 수 있는 준 일차원 다상 반응 유동 코드를 개발하였다. 준 일차원 코드를 이용해 유동장, 액상과 기상의 상호작용, 액적기화, 연료 냉각 막에서의 열전달, 그리고 Jet-A surrogate의 24개의 화학종 반응 미케니즘을 고려하여 핀틀 추력기의 성능해석을 수행하였다. 계산 결과는 실험 결과와 2-10% 오차 범위내로 일치하였다. A quasi-one dimensional multiphase reacting flow code has been developed to both investigate detail physics and analyze various performance of a liquid pintle thruster. The code calculates the performance of the liquid pintle thruster with consideration on flow flied, interaction between liquid and gas phases, heat transfer in fuel film, and the finite kinetics of 24 species of Jet-A surrogate. The results have good matches with experimental results within error range 2 to 10%.

PUF 출력 난수의 랜덤성 검증

황현민(Hwang Hyun Min),권순희(Kwon Soon Hee),신동준(Shin Dong Joon) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.11

Controlling Internal Pore Structure of Porous Carbon Nanofibers Based on the Miscibility between Polyacrylonitrile Matrix and Sacrificial Polymers

Hyunmin Hwang(황현민),Dong Wook Chae(채동욱),Youngho Eom(엄영호) 한국고분자학회 2021 폴리머 Vol.45 No.2

폴리아크릴로니트릴(PAN) 기반 혼합 용액의 전기방사를 통해 다공성 탄소나노섬유를 제조하였으며, 혼합된 고분자와 PAN 간 혼화성이 기공 구조에 미치는 영향이 연구되었다. 탄화 후 다공성을 부여하기 위해 희생용 고분자로 폴리비닐리덴플로우라이드(PVDF)와 스티렌-아크릴로니트릴 공중합체(SAN) 두 종이 선택되었고, PAN과 두 희생용 고분자 간 혼화성은 이론 및 실험적으로 평가되었다. 용해도 지수 분석 결과 SAN보다 PVDF가 쌍극자-쌍극자 상호작용을 통해 PAN과 더 가까운 친화성을 가짐이 증명되었다. PAN과 SAN(1.19)보다 PVDF(0.52) 간 더 낮은 용해도 지수 값은 PAN-PVDF계의 더 우수한 혼화성을 정량적으로 뒷받침해주었다. PAN/PVDF 혼합 필름의 동적 기계 분석에서, PAN과 PVDF의 유리전이온도를 나타내는 손실 탄젠트(tan δ) 피크가 각각 관찰되었고 서로를 향하여 이동하는 현상은 두 고분자의 부분적 혼화성을 입증하였다. 하지만, PAN/SAN 혼합필름의 경우, PAN의 tan δ피크 이동이 미미하였고, 이는 낮은 혼화성을 나타내는 이론적 분석 결과와 일치하였다. 탄화 후 PVDF계 혼합섬유는 길쭉한 형태의 기공구조를 보이는 반면, SAN계는 원형 기공구조를 가졌다. 이러한 기공구조의 차이는 두 희생용 고분자와 PAN 간의 혼화성 차이에 기인하였다. Porous carbon nanofibers were prepared via electrospinning of polyacrylonitrile (PAN)-based blend solutions and effects of miscibility of the blended polymers on pore structure were investigated. Two sacrificial polymers, poly(vinylidene fluoride) (PVDF) and poly(styrene-co-acrylonitrile) (SAN), were chosen as a sacrificial component to yield porosity after carbonization. The miscibility of PAN with each sacrificial polymer was evaluated both theoretically and empirically. Analyzing solubility parameters revealed that PVDF had higher chemical affinity with PAN due to dipole-dipole interaction than SAN. Lower value of Flory-Huggins interaction parameter of PAN with PVDF (0.52) than with SAN (1.19) quantitatively confirmed the better miscibility of PAN-PVDF. In dynamic mechanical analysis of PAN/PVDF blend films, individual loss tangent (tan δ) peaks (i.e., glass transition peak) for PAN and PVDF were observed but they were shifted to each other, indicating partial miscibility. In PAN/SAN films, however, the peak shift of PAN was negligible. These results coincided well with the theoretical analysis. After carbonization, the blend nanofibers exhibited high porosity with different pore structures; elongated shape for PVDF and round shape for SAN system. The pore structure discrepancy in the two systems was ascribed to the miscibility difference of each sacrificial polymer with PAN matrix.