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김동건(Dong Kun Kim),이정복(Jung Bock Lee),오기근(Ki Keun Oh) 대한피부과학회 1985 대한피부과학회지 Vol.23 No.1
A retrospective study was made of the previous medical records of 32 infants with congenital syphilis borne from mothers with untreated syphilis at Severence Hospital, Yonsei University College of Medicine during the years 1,972 through 19g3, These infants had a VDRL titer higher than 1: 8 with reactive FTA-ABS test and were also subjected to radiologic examinations. Radiologic changes and clinical features were analyzed, The following results were obtained: Of the total of 32 infants with congenital syphilis under 5 months of age, those under 1 month of age, were the most common group numbering a total of twelve. Of 32 infants with congenital syphilis, twenty-nine(91%) showed skeletal changes upon radiologic examination, Among them the different sites of bone involvernent revealed that the femur(92%) was the most commonly affected bone, followed by the humerus(88%), tibia(81%,), fibula(80%), ulna(72%), radius (68%). Among the same 29 infants a study of the presence of various abnormal bone changes showed that periostitis was the most common, being involved in 83%, the others being metaphysitis and periostitis(72%), metaphysitis(66%). 3. Among the clinicaI features presented in the 32 infants with congenital syphilis, hepatomegaly was the most common(63%,), followed by erythema with desquamation(47%), pneumonia(38%), maulopapules(34%).
김석원,김동건,유선경 ( Sug Won Kim,Dong Keun Kim,Seon Kyung Yo ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.5
N/A Ductile cast iron(DCI) with a multi-phase(ferrite-bainite-martensite) structures was produced by various special heat treatment. Intercritical heat treatment(I. C.), intermediate heat treatment(I. M.) and step quenching(S. Q.) were used to strengthen and toughen the fracture initiation sites such as graphite-marix interfaces and eutectic cell boundaries in DCI. The purpose of this study was to investigate of DCI by the special heat treatment. (I. C., I. M., and S. Q.) At a result, bainite nucleation rate at higher temperature was higher than that of at lower temperature, and shapes of bainite and martensite became bar /spheroidal type with increase of isothermal transformation time.
발광다이오드를 이용한 광파장에 따른 Chlorella vulgaris의 생장과 지방산 생산에 미치는 효과
김지훈(Z-Hun Kim),김동건(Dong Keun Kim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2016 한국해양바이오학회지 Vol.8 No.1
Microalgae are considered as superior biodiesel producers, because they could effectively produce high amount of lipid with fast growth rate. In this study, Chlorella vulgaris was exposed to various light wavelengths (λ<SUB>max</SUB> 470 nm, λ<SUB>max</SUB> 525 nm, and λ<SUB>max</SUB> 660 nm) using light emitting diodes (LEDs) to examine effect of light quality on their growth and fatty acid production in 0.4-L bubble column photobioreactors. Fluorescent lamps were also used as polychromatic light sources (control). From the results, biomass productivity was varied by light wavelength from 0.05 g/L/day to 0.30 g/L/day. Maximum biomass productivity was obtained from red LED among tested ones. We also observed that contents of oleic acid and linolenic acid, which affect biodiesel properties, were significantly changed depending on supplied wavelength. These results indicated that production of algal biomass, and fatty acid content and productivity could be improved or controlled by supplying specific light wavelength.
SiCp 입자강화 Al 복합재료에 대한 합금원소의 영향과 시효특성에 관한 연구
김석원(Sug Won Kim),이의종(Ui Jong Lee),우기도(Kee Do Woo),김동건(Dong Keun Kim) 한국주조공학회 2001 한국주조공학회지 Vol.21 No.1
The research on new DRA(discontinuous reinforced alloy) and CRA(continuos reinforced alloy) composites has been carried out to improve the properties of ceramic fiber and particle reinforced metal matrix composites(MMCs). Effects of alloying elements and aging conditions on the microstructures and aging behavior of Al-Si-Cu-Mg-(Ni)-SiCp composite have been examined. The specimens used in this study were manufactured by duplex process. The first squeeze casting is the process to make precomposite and the second squeeze casting is the process to make final composite. The hardening behavior was accelerated with decreasing the size of SiCp particle in the composites. It is considered that the dislocation density increased with increasing SiCp size, due to the different thermal deformation between Al matrix and SiCp during quenching after the solution treatment. Peak aging time to obtain the maximum hardness in 3㎛ SiCp reinforced Al composite was reduced than that in large size(5, 10㎛) of SiCp because of difference in dislocation density. Aging hardening responce(ΔH = H_(max)-H_(S.T)) of composites was greater than that of unreinforced Al alloy because of higher density of second phases in matrix.
MIF (Molded-In Foaming) 공정에 적합한 고분자 기재의유변학적 특성 연구
김민근 ( Ming Eun Kim ),송형용 ( Hyeong Yong Song ),김동건 ( Dong Gun Kim ),김효준 ( Hyo Jun Kim ),박건욱 ( Geon Uk Park ),유재근 ( Jae Keun Yu ),현규 ( Kyu Hyun ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.4
MIF (Molded-In Foaming) 공법의 발포 거동에 적합한 고분자 기재를 선정하기 위해 SBC (K-resin KK38)와 SBS (KTR 101와 KTR 301)의 유변물성을 측정하였다. SBS의 유변물성 (G``, G, η*)은 155 oC와 170 oC의경우 시간에 따라 유변물성 값의 변화가 거의 없으나, 185 oC와 200 oC의 경우에는 시간에 따라 증가하는 것을볼 수 있었다. 특히, KTR 301의 유변물성 값이 시간에 따라 큰 폭으로 증가하였다. 시간에 따른 유변물성 상승의정확한 원인을 확인하기 위해 155 oC와 200 oC에서 1800s 이후의 KTR 301의 비선형 유변물성을 진폭에 대해측정하였다. 155 oC에서는 일반적인 수지와 같은 한 번의 박화(thinning)현상이 관찰되나 200 oC에서는 두 번의박화현상이 관찰되었고 (Payne effect), 이는 고온에서 SBS가 겔화에 의한 경화가 일어난다고 볼 수 있다. 따라서이러한 유변물성으로부터 MIF 공법에 요구되는 특성(발포 초기 낮은 점도와 발포 완료 이후 높은 점도)에 적합한고분자 기재는 SBS KTR 301임을 확인할 수 있었다. In order to select polymer matrix for MIF (Molded-In Foaming) process, in this study, we investigated rheological properties of commercial polymers, SBC (Styrene-Butadiene Copolymers, K-resin KK38) and SBS (Styrene-Butadiene-Styrene, KTR 101 and KTR 301). In time sweep test, the rheological properties (G`, G, η*) of SBS at 155and 170 oC display almost constant value as a function of time from 0 s to 1800 s. On contrast, the rheological properties of SBS at 185 and 200 oC exponentially increase as a function of time. It could be due to gelation of SBS at high temperature conditions. These increment of rheological properties are not observed in SBC. From LAOS (large amplitude oscillatory shear) test, the nonlinear rheological properties of SBS at 155 and 200 oC after 1800 s are compared. The nonlinear rheological properties at 155 oC show simple strain thinning behavior such as linear homo polymer, however, the nonlinear rheological properties at 200 oC show 2 times strain thinning behavior (Payne effect). It well match with the gelation of SBS at 200oC. From rheological studies, it is confirmed that the proper polymer matrix for MIF process (low rheological properties at initial time and high rheological properties after process) is SBS KTR 301.