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폴리프로필렌 부직포에 아크릴산의 방사선 그라프트 반응에서 금속염의 효과
노영창,박종신,진준하 ( Young Chang Nho,Jong Shin Park,Joon Ha Jin ) 한국공업화학회 1996 공업화학 Vol.7 No.5
동시조사법에 의한 아크릴산의 폴리프로필렌 부직포에 대한 그라프트 반응에서 조사랑, 조사선량률, 금속염및 용매가 그라프트 반응에 미치는 영향을 조사하였다. 같은 조사선량에서는 선량률이 낮을수록 높은 그라프트율을 나타냈다. 한편 조사선량률을 달리하여 일정 시간 동안 그라프트 반응시키면 조사선량률이 높을수록 그라프트율은 높았으며, 첨가한 금속염의 종류에 관계없이 그라프트 속도는 조사선량률의 0.74 차수에 비례하였다. 사용한 금속염 중에서 FeSO₄·7H₂O가 가장 우수하였으며, 첨가제의 함량이 증가하면 할수록 그라프트율은 감소하였지만 적정농도이하에서는 그라프트용액이 고화되어 그라프트 반응시킬 수 없었다. The effect of absorbed dose, dose rate, cationic salts and solvent on the grafting yield was evaluated when acrylic acid was grafted onto polypropylene fabric by simultaneous irradiation process. Low dose rate when irradiated with the same absorbed dose led to a high grafting yield. On the other hand, the grafting yield increased with dose rate in case the total irradiation time is equal, and the initial rate of grafting was found to be proportional to be 0.74 power of dose rate. FeSO₄·7H₂O was found to be the most effective additive for high grafting yield, while inhibiting homopolymer formation. It was impossible to induce radiation grafting without the addition of the certain amount of salt, but the grafting yield decreased with increasing metallic salt.
고전압 개폐장치의 보조회로 및 제어회로에 대한 환경시험 검토(2)
박영창(Young-Chang Park),정주영(Joo-Young Jeong),김익수(Ik-Soo Kim),이정기(Jeong-Gee Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A study on the environmental tests for auxiliary and control circuits of high voltage switchgears, especially testing condition and requirements, according to the relevant international standards has been briefly reviewed in this paper. As the highest supply voltage of electric power systems have been progressed, testing techniques and testing standards such IEC codes improved and revised keeping step with it. Especially IEC 62271 series, which are applicable to the HV-class switchgears and controlgears have been revised in 2008 newly. In this paper, the special consideration and background information of environmental testing condition with mechanical operating performance, e.g. operation in a higher and lower ambient temperature, for the auxiliary and control circuits of switchgears and controlgears and considerable investigation to the related international standards have been provided. Examples of testing performed were showed and analysis of their test results have been described.
불안정성 대퇴골 전자간 골절에서 골수강외 정복(Extramedullary Reduction)의 효과: 사체를 이용한 생역학적 연구
박영창 ( Young Chang Park ),윤순필 ( Soon Phil Yoon ),양규현 ( Kyu Hyun Yang ) 대한골절학회 2018 대한골절학회지 Vol.31 No.3
목적: 본 연구는 후내측 피질골의 분쇄가 있는 불안정성 전자간 골절(AO/OTA classification 31-A2.2)에서 골절 부위 정복 형태에 따른 생역학적 특성을 신선 냉동 사체를 사용하여 실험하였다. 대상 및 방법: 총 8쌍의 신선 냉동 사체의 대퇴골을 무작위로 각각 골수강내 정복과 골수강외 정복 형태로 금속정 고정을 시행한 후 축성 압박 일회성 파괴 실험을 시행하였다. 초기 축성 강성, 최대 실패 하중 및 고정실패까지 총 흡수 에너지를 비교하였으며 고정실패 패턴을 확인하였다. 결과: 골수강외 정복은 골수강내 정복과 비교하여 평균 초기 축성 강성(422.7 N/mm vs. 332.0 N/mm, p=0.017), 최대 실패 하중(2,848.7 N vs. 1,966.5 N, p=0.012) 및 고정실 패까지 총 흡수 에너지(27,969.9 N·mm vs. 14,751.0 N·mm, p=0.012)가 각각 27.3%, 44.9%, 89.6% 높았다. 결론: 후내측 피질골 결손을 동반된 불안정성 전자간 골절에서 골수강외 정복은 골수강내 정복과 비교하여 생역학적으로 우수한 결과를 보였다. 전내측 피질골은 후내측 피질골 결손에도 불구하고 적절한 지지대가 될 수 있으며 골절 고정의 안정성을 높이는 데도 도움을 줄 수 있음을 확인하였다. Purpose: To prevent excessive sliding and subsequent fixation failures in unstable intertrochanteric fractures with posteromedial comminution, extramedullary reduction through overlapping of the anteromedial cortices of both proximal and distal fragments as a buttress has been introduced. The purpose of this study was to compare the biomechanical properties between two reduction methods-intramedullary reduction and extramedullary reduction-in treating unstable intertrochanteric fractures with posteromedial comminution (AO/OTA classification 31-A2.2). Materials and Methods: Eight pairs of frozen human cadaveric femora were used. The femora of each pair were randomly assigned to one of two groups: the intramedullary reduction group or the extramedullary reduction group. A single axial load-destruction test was conducted after cephalomedullary nailing. Axial stiffness, maximum load to failure, and energy absorbed to failure were compared between the two groups. Moreover, the pattern of mechanical failure was identified. Results: The mean axial stiffness in the extramedullary reduction group was 27.3% higher than that in the intramedullary reduction group (422.7 N/mm vs. 332.0 N/mm, p=0.017). Additionally, compared with the intramedullary reduction group, the mean maximum load to failure and mean energy absorbed to failure in the extramedullary group were 44.9% and 89.6% higher, respectively (2,848.7 N vs. 1,966.5 N, p=0.012 and 27,969.9 N·mm vs. 14,751.0 N·mm, p=0.012, respectively). In the intramedullary reduction group, the mechanical failure patterns were all sliding and varus deformities. In the extramedullary reduction group, sliding and varus deformities after external rotation were noted in 3 specimens, sliding and varus deformities after internal rotation were noted in 3 specimens, and medial slippage was noted in 2 specimens. Conclusion: In unstable intertrochanteric fractures with posteromedial comminution, the biomechanical properties of extramedullary reduction are superior to those of intramedullary reduction. Anteromedial cortex could be the proper buttress, despite a comminuted posteromedial cortex. It could help enhance the stability of the bone-nail construct.
폴리프로필렌 부직포에 스틸렌의 방사선 그라프트 반응에서 첨가제의 영향
박종신,노영창,진준하,이면주 ( Jong Shin Park,Young Chang Nho,Joon Ha Jin,Myun Zu Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.5
Co-60 조사하에서 동시조사법으로 폴리프로필렌 부직포에 스틸렌을 그라프트 중합반응시키면서 조사량, 조사선량률, 용매효과, 산 및 다관능성 단량체의 첨가효과에 대하여 고찰하였다. 같은 조사량의 경우 조사선량률이 낮을수록 그라프트율은 증가하였다. 초기의 그라프트 반응속도는 조사선량의 0.56차수에 비례하였다. 산을 그라프트용액에 첨가하면 전 농도 범위에서 그라프트율이 향상되었으며, 또한 다관능성 단량체를 첨가하여도 그라프트율이 증가하였다. 2개의 비닐기를 가진 DVB에 비하여 3개의 비닐기를 가진 TMPTA를 첨가하면 더 높은 그라프트율을 나타냈다. 한편 산과 다관능성 단량체를 동시에 첨가하면 별개로 첨가한 것보다 훨씬 높은 그라프트 촉진 효과를 나타냈다. The present studies are to describe the grafting reaction of styrene in various solvents to polypropylene fabric by the simultaneous method using Co-60. The influence of various factors such as absorbed dose, dose rate, type of solvent, acid and multifunctional monomer were evaluated. At constant absorbed dose, the grafting yield was found to be higher at low dose rate. The initial rate of grafting was found to be proportional to a 0.56 power of dose rate. The inclusion of mineral acid in the grafting solution led to an increase in radiation grafting yield at almost all monomer concentration examined. Multifunctional monomer was also effective to increase grafting yield. The addition of both acid and multifunctional monomer was found to accelerate the grafting yield much more than the separate addition of two additives.
이차원전기영동을 이용한 Escherichia coli O157:H7 균주간 항원 Spot의 비교
안영창,신기욱,신용승,이응구,이형준,박미림,김영림,정태성,김곤섭,김용환,Ahn, Yeong-Chang,Shin, Gee-Wook,Shin, Yong-Seung,Lee, Eung-Goo,Lee, Hyoung-Jun,Park, Mi-Rim,Kim, Young-Rim,Jung, Tae-Sung,Kim, Gon-Sup,Kim, Yong-Hwan 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.2
Proteomics is an emerging powerful tool in studying protein expression and function. At present study, proteomics was employed to evaluate the antigenicity among Escherichia coli O157:H7 strains using 2-dimensional gel electrophoresis (2-DE) and immunoblotting, SDS-PAGE and immunblotting analysis revealed no big differences among E coli O157:H7 strains. 2-DE analysis, however, revealed common antigens as well as specific antigens. The immunoblotting analysis revealed 20 common antigenic spots among E coli O157:H7 strains. In addition, there were 3 and 13 spots as common antigens between ATCC 43894 and KSC 109, and between ATCC 43894 and ACH 5, respectively. Antigenic spots specific for individual strain were also identified as 15, 8 and 22 for ATCC 43894, ACH 5 and KSC 109, respectively. The common antigens would be useful by employing either vaccine development or diagnosis marker, or both, whereas the specific antigens of individual strains would be applicable for epidemiological study. This study suggest that proteome analysis, representative as 2-DE, is valuable tool in exploring the E. coli antigenicity.
다발성 부전골절을 동반한 종양성 골연화증 - 증례 보고 -
박영창 ( Young-chang Park ),서준오 ( Joon-oh Seo ),양규현 ( Kyu-hyun Yang ) 대한골절학회 2017 대한골절학회지 Vol.30 No.3
종양성 골연화증은 종양에서 분비하는 FGF-23으로 인하여 발생되는 저인산혈증, 신장 인산염 소모, 골연화증 및 다발성 부전골절을 특징으로 하는 드문 부종양성 증후군이다. 치료는 원인이 되는 종양을 찾아내어 완전절제 하는 것이 원칙이며, 수술 후 극적인 회복을 기대할 수 있다. 저자들은 후 경골근 주위에 발생한 종양성 골연화증의 원인이 되는 종양을 제거하여 증상 및 골밀도가 극적으로 회복된 사례를 보고하는 바이다. Oncogenic osteomalacia is a rare paraneoplastic syndrome, characterized by hypophosphatemia, renal phosphate wasting, osteomalacia, and multiple insufficiency fractures, as a result of the tumor. A wide excision of the causative tumor is considered as the treatment of choice, following which, a dramatic recovery is expected. Authors report a case in which the symptoms and bone mineral density were dramatically recovered after an excision of the causative tumor around the tibialis posterior muscle in oncogenic osteomalacia.