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레이저 침탄공정시 철과 흑연의 혼합 슬러리가 침탄특성에 미치는 효과
지원종 ( Won-jong Ji ),이성훈 ( Seong-hoo Lee ),문영훈 ( Young-hoon Moon ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
Laser surface carburizing can be achieved by a laser alloying mechanism, which includes melting the graphite coated substrate and dissolution of the graphite in the liquid state. The drawback of laser carburizing is that process-induced cracks frequently form on the carburized surface as a result of carbon enrichment and the rapid re-solidification rates. Hence, in this study laser surface carburizing of a substrate coated with a mixed slurry of graphite and Fe powders was implemented to increase the surface hardness without surface cracking. The cracking susceptibility, carburized depth and the hardness of the carburized layer were investigated for various laser processing conditions. The results showed that a lower relative content of graphite powder in mixed slurry reduces the cracking susceptibility on the carburized surface without significantly decreasing hardness. From the analysis results, operational guides for laser surface carburizing processing are provided for achieving a crack-free carburized surface with desired hardness. (Received February 11, 2016 ; Accepted May 23, 2016)
최성진 ( Seong Jin Choi ),권민관 ( Min Kwan Kwon ),박문 ( Moon Park ),배수야 ( Soo Ya Bae ),오현호 ( Hyun Ho Oh ),이종호 ( Jong Ho Lee ),문지인 ( Ji In Moon ),박찬선 ( Chan Sun Park ),원종철 ( Jong Chul Won ),고경수 ( Kyung Soo K 대한천식알레르기학회 2015 Allergy Asthma & Respiratory Disease Vol.3 No.4
Insulin-induced allergy is a rare adverse drug reaction since the introduction of recombinant human insulin. However, recombinant insulin-induced allergy is still being reported in 0.1% to 2% of all patients treated with insulin. This allergic reaction varies from mild localized skin reactions to life-threatening anaphylaxis. It has been shown that one-third of insulin allergy cases is related to insulin itself and the remaining occur due to preservatives contained in the insulin preparations, such as protamine, zinc, or metacresol. This case report describes a 75-year-old woman with poorly controlled diabetes who experienced insulin allergy. She complained of urticaria with itching after the injection of insulin. Allergic skin tests showed positive responses to all available human insulin preparations, and specific IgE to human insulin was also detected, which suggested that her urticaria was developed by insulin itself. This is the first case of insulin allergy that was sensitive to all available human insulin preparations and confirmed by the presence of specific IgE to human insulin. It is important to remember that allergic reactions to insulin may be directly associated with adherence and can be the reason of poor glucose control. (Allergy Asthma Respir Dis 2015;3:302-306)
각종 조혈모세포 근원별 CD34+ 양성세포율 및 혈구 집락배양의 비교
목지오,변재호,김숙자,전진우,원종호,백승호,서원석,홍대식,박희숙 대한조혈모세포이식학회 1996 대한조혈모세포이식학회지 Vol.1 No.1
목적: 각종 조혈모세포의 근원인 말초혈액(PB), 고용량 항암요법과 조혈성장인자 투여후 얻은 말초혈액(MPB), 골수(BM) 및 제대혈 (UB)의 단핵구를 이용하여 CD₃₄+ 세포양성율 및 각종 조혈전구 세포의 집락 형성능을 비교 관찰하고자 한다. 방법: flow cytometry와 anti-CD₃₄+ 단세포항체를 이용하여 각종 조혈모세포 근원의 CD₃₄+ 양성세포함유 정도를 측정하였고, 분리된 단핵구를 집락배양하여 CFU-GM, BFU-E, CFU-GEMM 및 HPP-CFC의 집락형성능을 관찰하였다. 결과: 1) 각 조혈모세포의 근원별 CD₃₄+ 양성세포의 분리 전후의 비교 CD₃₄+ 양성세포의 양성률은 고용량 항암요법과 조혈성장인자 투여후 얻은 말초혈액에서 3.46±0.72%로 가장 높았으며 골수와 제대혈에서 각각 1.78±0.86%과 1.53±0.43%으로 비슷하였으며 말초혈액에서 0.14%로 가장 낮았다. CD₃₄+ 세포를 분리하였을 때, 분리후 CD₃₄+ 양성세포는 제대혈액에서 96.99±1.95%로 가장 높았으며 고용량 항암요법과 조혈성장인자 투여후 얻은 말초혈액에서 72.54±14.06%, 골수에서 60.6±1.9%, 그리고 말초혈액에서 54%로 나타났다. 2)각 조혈모세포의 근원별 조혈전구세포의 집락형성 CFU-GM, BFU-E, CFU-GEMM 그리고 HPP-CFC를 사용한 집락배양결과 CD₃₄+ 양성세포 분리군에서 비분리군에 비해 집락수가 많았으며, CFU-GM의 경우 그 비는 말초혈액, 골수, 그리고 제대혈액에서 각각 112배, 10배, 5배, 26배 또한 CFU-GEMM은 각각 136배, 8배, 12배가 높았다. 결론: 각종 조혈모세포의 근원별 CD₃₄+ 양성세포의 양성세포율 및 조혈전구세포 집락배양비교시 CD₃₄+ 양성세포와 조혈전구세포가 말초혈액이나 골수보다 MPB나 제대혈에서 훨씬 많은 것을 관찰하였다. Background: Classically bone marrow is the major source of hemopoietic stem cells of the allo/autologous hemopoietic stem cell tansplantation. Recently, hemopoietic stem cells circulate in peripheral blood, "mobilized" with cytokines and/or cytotoxic chemotherapy and umbilical cord blood stem cells, are widly used for high dose chemotherapy with hemopoietic stem cells support. The aim of this study is to investigate the possibility of clinical applications of selected CD34+ cells with source of hemopoietic stem cells such as, peripheral blood(PB), mobilized PB(MPB), bone marrow(BM), and umbilical cord blood(UB) Methods: We evaluated the comparison of the clonogenicithy and percentage of CD₃₄+ cells according to each source of hemopoietic stem cells in before and after separation of CD₃₄+ cells through in vitro colony assay and flow cytometry with anti-CD₃₄+ monoclonal antibody. Results: 1) CD34+ cells were detected in PB, MPB, BM, and UB at incidences of 0.14%, 3.46 ±0.72%, 1.78±0.86%, and 1.53±0.43% of total mononuclear cells. And the most CD34+ cells were detected in UB after seperation of CD₃₄+ cells. 2) The colony counts revealed more in CD₃₄+ isolating group. Clonogenicity of CD₃₄+ cells in PB, MPB, BM, and UB was 112-fold, 10-fold, 5-fold, and 26-fold in colony forming unit-granulocyte and macrophage(CFU-GM), and 136-fold, 8-fold, 3-fold, and 12-fold in colony of forming unit-granulocyte, erythrocyte, monocyte, megakaryocyte(CFU-GEMM). The colony counts of UB and MPB were large numbers more than PB and BM. Conclusion: Clonogenicity and percentage of CD₃₄+ cells are superior MPB and UB than in PB and BM.