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Pulsed Nd:YAG 레이저 조사와 불소 화합물 도포가 초기 우식 법랑질의 표면 경도에 미치는 영향
곽준봉,기우천 전남대학교 치과대학 1996 전남치대논문집 Vol.8 No.1
This study was designed to determine the most effective concentration of fluoride and energy density of laser irradiation for the anticarious effect. For this study, surface hardness in enamel was measured before and after irradiation with pulsed Nd : YAG laser and the topical application of fluoride. Of the permanent mandibular anterior bovine teeth, healthy, carious free ones were used. Three hundred specimens were made. Specimens within 25~45 Vickers hardness numbers were assigned to 20 control and experimental groups : each containing 15 specimens. After forming artificial carious lesions, 10 J/㎠, 20 J/㎠, and 30 J/㎠ energies were irradiated on the enamel surface of each experimental group. Also NaF, NH_4F, Elmex gel(amine fluoride) and APF gel fluoride compounds were applied topically. Next, all the specimens were placed into the pH circulatory procedures for eight days. Vickers hardness numbers were measured using a microhardness tester. Surface changes of the enamel were observed using an scanning electron microscope. The comparative analysis yielded the following results : 1. The reduction of surface hardness of the enamel surface was less in all groups with fluoride application than in the group without fluoride application. 2. The APF gel group with 10 J/㎠ irradiation showed the lowest reduction of surface hardness. 3. The reduction of surface hardness of the enamel surface in the group of laser irradiation without fluoride application not showed any significant difference according to the energy density of the laser. 4. Under the scanning electron microscope, in enamel irradiated with 10 J/㎠ showed appearance similar to acid etching surface. In enamel irradiated with 20 J/㎠, fine enamel crack was detected. In enamel irradiated with 30 J/㎠, severe enamel crack and fusion of enamel were detected. These results suggest that one could obtain the best anticariogenic effects without damage to teeth in the group of application of APF gel after laser irradiation with 10 J/㎠.
Kang, Bong Kyun,Song, Young Hyun,Park, Won Kyu,Kwag, Sung Hoon,Lim, Byeong Seok,Kwon, Seok Bin,Yang, Woo Seok,Yoon, Dae Ho Elsevier 2017 Journal of the European Ceramic Society Vol.37 No.12
<P><B>Abstract</B></P> <P>In this study, graphite oxide was successfully synthesized from bulk graphite flakes using a Couette-Taylor flow reactor. A high yield (∼93%) of single-layer and few-layer graphene oxide sheets was achieved in this study within a reaction time of one hour by optimizing the conditions. The graphite oxide was effectively exfoliated using the Taylor vortex flow with shearing stress. The degree of oxidation and the graphite oxide morphology were then studied. In addition, mesoporous and three-dimensional nitrogen-doped graphene structures were prepared via graphene oxide sheets and facile solution phase synthesis followed by thermal treatment. The nitrogen in the pyrrolidone ring of PVP was decomposed and incorporated into the carbon network, including pyridinic-N and graphitic-N. Furthermore, the mesoporous and three-dimensional Ni<SUB>1.5</SUB>Co<SUB>1.5</SUB>[Co(CN)<SUB>6</SUB>]<SUB>2</SUB> Prussian blue analogue (PBA) and NiCo sulfides/N-doped graphene hybrid composite structures were successfully demonstrated via facile hydrothermal method.</P>
기우천,곽준봉 대한 두개하악장애학회 1989 대한두개하악장애학회지 Vol.- No.1
Eagle증후군은 경상돌기의 신장 및 경상설골인대나 경돌하악인대의 석회화와 관련하여 인후부의 이물감, 연하곤란, 발음곤란, 연관통 및 개구장애등을 주증상으로 하는 질환으로 Styloid syndrome, Stylohyoid syndrome, Elongated styloid process syndrome, Styloid process neuralgia 등 여러가지 명칭이 사용되고 있다. Eagle증후군의 원인은 아직 명확하지 않으며, 나타나는 동통의 기전에 따라 classic type과 carotid artery type으로 분류되는데 classic type은 대부분 편도선 절제 후에 증상이 나타나며, 주증상에는 인후부의 이물감, 연하곤란, 연관통등이 있고, carotid artery type의 주증상은 머리를 돌릴때 나타나는 방사상 동통 및 두통 등이다. 감별 해야할 질환으로는 설인신경동, 측두하악장애, 매복지치, 경부 관절염, 종양등이 있다. 경상하악인대의 석회화에 대해 1652년 Marchelti가 최초로 보고한 이래 1937년 Eagle은 경상돌기의 신장과 관련된 증후군에 대한 증례보고를 한바 있으며 이를 Eagle 증후군으로 명명하였다. 그후 Stafne의 stylohyoid chain의 방사선학적 소견에 관한 연구, Kaufman의 styloid process의 여러 형태에 관한 연구, Steinman의 styloid syndrome의 pathogenesis에 관한 연구와 Dayal, Curphey, Ettinger, Mosser, Gossman 등 의 styloid syndrome 에 대한 대수의 증례보고가 있었으며, 또한 Correll은 일반 성인에서 경상돌기 신장 및 경상설골인대 석회화의 성별 연령별 발생 빈도에 대하여 보고 하였다. 그러나 경상돌기의 신장 및 경상설골인대의 석회화와 관련하여 임상적 증상이 나타나는 경우의 발생빈도에 대하여는 보고가 희소한 상태이다. 이에 저자는 전남대학교 병원에 내원하여 Eagle증후군이라 진단되어진 환자와 문헌상의 증례보고를 종합하여 Eagle증후군에 대해 다소의 지견을 얻었기에 이에 보고하는 바이다.
곽성훈,이영훈,김민섭,이철우,강봉균,윤대호,Kwag, Sung Hoon,Lee, Young Hun,Kim, Min Seob,Lee, Chul Woo,Kang, Bong Kyun,Yoon, Dae Ho 한국결정성장학회 2017 한국결정성장학회지 Vol.27 No.3
$Ni_3[Co(CN)_6]_2$ PBAs의 하소과정을 통해 단분산된 $NiO/NiCo_2O_4$ 나노큐브를 성공적으로 합성했다. 단분산된 $Ni_3[Co(CN)_6]_2$ PBAs 나노큐브는 수열합성 반응 시 생성된 핵 들의 '자기조립'에 의해 형성된다. 이때 입자의 자기조립 속도는 온도와 계면활성제인 SDBS(Sodiumdodecylbenzenesulfonate)의 양에 의해 영향을 받으며, FESEM 분석을 통하여 SDBS: 0.25 g, 온도: $60^{\circ}C$에서 단분산된 200 nm의 PBA 나노큐브들을 얻을 수 있었다. 최적의 하소 조건을 결정하기 위해 Thermogravimetric-Differential Thermal Analysis(TG-DTA)를 통해 열적 거동을 확인하였다. 그리고 PBA 전구체 및 $NiO/NiCo_2O_4$ 입자의 형상과 결정성을 확인하기 위해 Field emission scanning electron microscopy(FESEM)과 X-ray diffraction(XRD) 분석을 진행하였다. $NiO/NiCo_2O_4$ nanocubes were successfully synthesized via the calcination process of $Ni_3[Co(CN)_6]_2$ PBAs. The prepared monodispersed $Ni_3[Co(CN)_6]_2$ PBAs were aggregated by 'self-assembly' of the nuclei generated during the synthesis reaction. The self-assembly rate of the particles is affected by the temperature and the amount of surfactant SDBS (sodium dodecylbenzenesulfonate). FESEM analysis shows that monodispersed 200 nm PBA nanocubes are obtained at 0.25 g SDBS and $60^{\circ}C$ temperature. Thermal behavior was confirmed by thermogravimetric-differential thermal analysis (TG-DTA) to determine optimal calcination conditions. Then, field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analyzes were performed to investigate the morphology and crystallinity of the particles precursors and $NiO/NiCo_2O_4$ nanocubes.
도심항공교통시스템 운용 개념 분석에 따른 운항경로 구축 연구
이영재(Youngjae Lee),곽태호(Tae Ho Kwag),정구문(Gu Moon Jeong),안재현(Jae Hyun Ahn),정봉철(Bong Cheul Chung),이재우(Jae-Woo Lee) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.12
인공지능, 자율항법 등 4차 산업의 기술들이 발전하면서 도심항공교통(UAM)이 도심의 교통 체증에 대한 효과적인 대안으로 고려되고 있으며, 한국을 비롯한 세계의 많은 기업들이 비행체 개발과 운용 체계 연구를 수행하고 있다. 본 연구에서는 도심항공교통의 운용에 필요한 요소들을 식별, 분류한 뒤 운용 체계 개념을 수립하였으며, 각 요소별로 세부적 고려사항들을 분석하였다. 운용 체계 개념 분석 결과를 기반으로 서울시와 경인권을 연결하는 도심항공교통 운항경로를 구축하였으며, 비행체의 성능 분석을 통하여 구축된 운항경로가 운용이 가능함을 확인하였다. 본 경로 분석연구는 추후 국내 여러 도시의 도심항공교통 운항경로 수립에 적용이 가능할 것으로 예측된다. With the advent of industry 4.0 technologies like the artificial intelligence and the autonomous flight, Urban Air Mobility (UAM) is being considered as an effective alternative to resolve the ground urban traffic congestion. Accordingly, many companies in the world including Korea are investigating on the development of UAM vehicles and operation systems. In this study, after identifying and classifying the essential elements of the UAM operation, the UAM system operational concept has been derived, then detailed analyses for each element has been performed. Based on the conceptual analysis of the UAM operation system, UAM flight routes in Seoul and Gyeong-In area have been established and confirmed to be operable through the performance analysis of UAM vehicles. The flight route analysis in this study is expected to be applied to UAM flight routes establishment in various cities in the future.
HBsAg 양성인 비호즈킨 림프종 환자에서 항암 화학요법 후 간 기능 악화
김창민,이영우,이상원,김봉석,이군희,조진아,정숙향,이진오,한철주,김유철,정문관,강윤구,류백렬,곽진영,홍현주,이군학 대한소화기학회 2000 대한소화기학회지 Vol.35 No.1
Background/Aims: Immunosuppressive therapy such as anti-cancer chemotherapy is often complicated with reactivation of hepatitis B. We tried to investigate the prevalence of hepatitis B virus (HBV) infection in patients with non-Hodgkin's lymphoma (NHL). Furthermore, we evaluated the frequency of hepatic complications, the clinical outcome, and the risk factors associated with the development of hepatic complications in HBsAg-positive patients treated with chemotherapy for NHL. Methods: One hundred eighty-five patients who were diagnosed as NHL and treated with chemotherapy were retrospectively analyzed. Results: The prevalence of HBV infection was 14.1% of the patients. The frequency of hepatic complications in HBsAg-positive patients receiving chemotherapy for NHL was significantly higher than those of HBsAg-negative patients. (50% vs. 10.1%), and the complete response (CR) rate was significantly lower (42.3% vs. 67.9%). We could not find any significant risk factor associated with the development of hepatic complications in HBsAg-positive NHL patients received chemotherapy. Conclusions: For HBsAg-positive NHL patients receiving chemotherapy, special concern and close follow-up is needed because of high frequency of hepatic complication and low CR rate caused by chemotherapy.