방사성고화체로부터의 $^{60}$ Co, $^{137}$ Cs 침출에 대한 표준시험법의 상호비교

김기홍,유영걸,정경기,홍권표,이락희,정의영,고덕준,김헌,Kim, Ki-Hong,Ryu, Young-Gerl,Chung, Kyung-Ki,Hong, Kwon-Pyo,Lee, Nak-Hee,Jeong, Yi-Yeong,Koh, Duck-Joon,Kim, Heon 한국방사성폐기물학회 2003 방사성폐기물학회지 Vol.1 No.1

IAEA, FT-04-020 및 ANS 16.1의 침출시험법을 각각 수행하여 얻은 시험결과를 이용하여 상호 비교 평가하였다. 붕산을 함유한 파라핀 및 시멘트 고화체에서의 $^{60}$Co 과 $^{137}$Cs의 ANS 16.1의 침출지수는 6이상이었으나 고화매질과 탈염수의 종류에 따라 상반되는 침출거동을 보였다. 침출수로 합성해수와 탈염수를 사용하였을 경우 $^{60}$Co는 시멘트 고화체에서는 합성해수, 파라핀 고화체에서는 탈염수에서 침출이 높았다. 반면에 $^{137}$Cs의 침출정도는 시멘트에서는 탈염수, 파라핀에서는 합성해수에서 높았다. $^{60}$Co의 침출분율은 시멘트 고화체에서 IAEA > ANS > FT의 순으로 높았으며, 반대로 파라핀고화체에서는 이의 역순이었다. IAEA, FT-04-020, and ANS 16.1, standard leaching test methods, were evaluated comparatively with their test results. Leaching index of $^{60}$ Co and $^{137}$ Cs by ANS 16.1 method for waste forms of paraffin and cement were above 6.0. Their leaching behavior were depending on the type of matrix and leachant. Leachability of $^{60}$ Co for cement waste form was higher in simulated seawater than do-mineralized water, and was higher in de-mineralized water for paraffin waste form. leachability of $^{60}$ Co was contrary to $^{137}$ Cs. Cumulative fraction leached of $^{60}$ Co was higher in order or IAEA > ANS > FT in a cement waste form.

광선각화증, 보웬병, 편평상피세포암에서 Ki-67, Cyclin A, p53, p16의 발현 양상

이효진 ( Hyo Jin Lee ),신동훈 ( Dong Hoon Shin ),최종수 ( Jong Soo Choi ),김기홍 ( Ki Hong Kim ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.4

Background: Actinic keratosis (AK) and bowen`s disease (BD) are pre-cancerous diseases, and are regarded as an early squamous cell carcinoma (SCC). AK and BD can be progressed into SCC. In this process, tumor suppressor and cell proliferative proteins may play important roles. Objective: To investigate the differences of expression patterns of the immunohistochemical (IHC) staining and useful markers for differential diagnosis in AK, BD and SCC. Methods: Biopsy had proven 17 cases of AK, 20 cases of BD and 17 cases of SCC, which were all selected. IHC staining for Ki-67 and cyclin-A, as cell proliferative markers, p53 and p16 as tumor suppressor markers, were performed. Labeling index (LI) and distribution pattern of IHC expressions were measured. Results: LI of Ki-67 in AK, BD and SCC were 30.6%, 60.2% and 54.8%, respectively. LI of cyclin-A in AK, BD and SCC were 9.2%, 24.4% and 24.1%, respectively. LI of p53 in AK, BD and SCC were 20.7%, 37.9%, and 39.9%, respectively. LI of p16 in AK, BD and SCC were 10.6%, 38.3% and 39.9%, respectively. Lower 1/3 was the most frequent distribution pattern in AK in all IHC stains, full thickness lower 2/3 were the most frequent distribution pattern in BD and SCC in all IHC stains. Conclusion: LI and distribution pattern of Ki-67, cyclin-A, and p16, as well as the distribution pattern of p53 may be useful markers to differentiate AK from BD and SCC. Higher degree and full-thickness distribution pattern IHC expressions in all stains may be helpful in the diagnosis of BD, rather than AK. (Korean J Dermatol 2012;50(4):290∼298)

일체형 지대주의 Diamond Like Carbon 표면 처리와 나사 조임 시기가 풀림 현상에 미치는 영향

김기홍,곽재영,허성주,Kim, Ki-Hong,Koak, Jai-Young,Heo, Seong-Joo 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.2

Statement of problem: It is difficult about assessing the loosening tendency of conical connection type implant after cyclic loading with diamond like carbon coating one-piece abutments, and also about the retightening effect. Purpose: This study was performed to investigate the influence of one-piece abutment screw retightening after $5.0{\times}10^{4}$ cyclic loading and Diamond like coating Material and methods: Thirty two ITI implant were divided to 4 groups. Group 1,3-titanium abutment, group 2,4 - diamond like carbon coated abutment. Group 1,2 - $20.0{\times}10^{4}$ cyclic loading after $5.0{\times}10^{4}$ cyclic loading, Group 3,4- after $20.0{\times}10^{4}$ Cyclic loading. After cyclic loading, periotest values were taken and removal torque values of abutments were measured with a digital torque gauge. Results: 1. The removal torque of group 2 after $5.0{\times}10^{4}$ cyclic loading is slightly greater than the other groups but not significantly higher than others (P>0.05). 2. The final removal torque values after $20.0{\times}10^{4}$ cyclic loading of group 1 is bigger than group 3, and group 2 is bigger than group 4, but not significantly higher (P>0.05). 3. The final removal torque values after $20.0{\times}10^{4}$ cyclic loading of all groups are not significantly different (P>0.05). 본 연구의 목적은 내측연결형 임플랜트와 일체형 지대주를 사용하여 최종 보철물을 시적한 뒤에 5만 번의 반복하중 후에 다시 체결하고 20만 번의 반복하중을 가한 후의 지대주 풀림토크와 20만 번의 반복하중을 받은 지대주 풀림토크가 어떻게 달라지는지를 비교하고자 하는 것이다. 실험 재료로는 타이타늄 지대주와 DLC 코팅된 지대주를 사용하였다. 실험군은 4군으로 모두 8개의 ITI SLA $4.1{\times}10mm$ 를 사용하였다. A군과 B군은 5만번, 20만번 반복하중을 가하고 Periotest값과 풀림 토크값을 측정하였으며 C군과 D군은 20만번 반복하중을 가하고 Periotest 값과 풀림토크값을 측정하였다. 풀림 토크값의 측정은 디지털 토크 게이지를 사용하였고, 반복하중은 MTS. (Bionix 850 II, MTS, U.S.A.)를 사용하였으며 100N/cm의 힘을 20도의 경사, 14Hz 의 조건으로 가하였다. A군과 C군은 코팅하지 않은 타이타늄 지대주를 사용하였으며, B군과 D군은 DLC 코팅한 지대주를 사용하였다. 1. 5만번 반복하중을 가한 뒤 측정한 풀림 토크는 B군에서 약간 더 큰 평균값을 보였다. 하지만 통계학적으로 두 군간에 유의한 차이를 보이지 않았다 (P>0.05). 2. 20만번 반복하중을 가한 뒤 측정한 최종 풀림 토크 값은 A군은 C군보다, B군은 D군보다 약간 더 큰 평균값을 보였으나 통계학적으로 두 군간에 유의한 차이를 보이지 않았다 (P>0.05). 3. 20만번 반복하중을 가한 최종 풀림 토크 값은 A, B군과 C, D군 사이에 통계학적으로 유의할 만한 차이가 없었다 (P>0.05).

Two Korean Digenetic Trematodes : Orientocreadium. koreanum sp. nov. and O. pseudobagri Yamaguti 1934(Orientocreadiidae) from Freshwater Fishes

김기홍,임한종,Kim, Ki-Hong,Rim, Han-Jong 한국어병학회 1995 한국어병학회지 Vol.8 No.2

한국산 민물어류에 기생하는 연충류를 조사하기 위해 본 연구를 시행하였으며, 본 논문에서는 2종류의 흡충류를 동정, 분류하였다. Orientocreadium koreanum n. sp.는 퉁가리의 장에서 검출된 신종이며, O. pseudobagri Yamaguti, 1934는 동자개의 장에서 검출된 한국산 미기록 종이었다. Orientocreadiidae과의 분류학적 문제점들에 관해 고찰하였으며, 분류된 2종에 대해 기존의 기록종들과의 차이점들을 상세히 논하였다. One new and one the first recording digenetic trematodes are described from Korean freshwater fishes : Orientocreadium koreanum sp. nov. from Liobagrus andersoni Regan (Korean torrent catfish) and O. psedobagri Yamaguti, 1934 from Pseudobagrus fulvidraco (Richardson) (Korean bullhead). The problems of the family Orientocreadiidae and the major identifying characters of O. koreanum are discussed.

AlAs 에피층 위에 성장된 InAs 양자점의 Photoluminescence 특성연구

김기홍,심준형,배인호,Kim, Ki-Hong,Sim, Jun-Hyoung,Bae, In-Ho 한국재료학회 2009 한국재료학회지 Vol.19 No.7

The optical characterization of self-assembled InAs/AlAs Quantum Dots(QD) grown by MBE(Molecular Beam Epitaxy) was investigated by using Photoluminescence(PL) spectroscopy. The influence of thin AlAs barrier on QDs were carried out by utilizing a pumping beam that has lower energy than that of the AlAs barrier. This provides the evidence for the tunneling of carriers from the GaAs layer, which results in a strong QD intensity compared to the GaAs at the 16 K PL spectrum. The presence of two QDs signals were found to be associated with the ground-states transitions from QDs with a bimodal size distribution made by the excitation power-dependent PL. From the temperature-dependent PL, the rapid red shift of the peak emission that was related to the QD2 from the increasing temperature was attributed to the coherence between the QDs of bimodal size distribution. A red shift of the PL peak of QDs emission and the reduction of the FWHM(Full Width at Half Maximum) were observed when the annealing temperatures ranged from 500 $^{\circ}C$ to 750 $^{\circ}C$, which indicates that the interdiffusion between the dots and the capping layer was caused by an improvement in the uniformity size of the QDs.

자연 성장된 InAs/AlAs 양자점의 Photoreflectance 특성

김기홍,심준형,배인호,Kim, Ki-Hong,Sim, Jun-Hyoung,Bae, In-Ho 한국진공학회 2009 Applied Science and Convergence Technology Vol.18 No.3

MBE법으로 성장된 InAs/AlAs 양자점(quantum dots; QD) 구조의 광학적 특성을 photoreflectance(PR) 이용하여 조사하였다. Wetting layer(WL) 두께에 따른 전체 장벽의 폭이 달라짐에 따라 GaAs 완충층 및 WL 신호의 세기가 변화되었다. QD 층이 식각된 시료의 상온 PR측정 결과로부터 $1.1{\sim}1.4\;eV$ 영역의 완만한 신호는 InAs QDs과 WL에 관련된 신호임을 알았다. 온도 $450{\sim}750^{\circ}C$범위에서 열처리 시켰을 때 WL층의 PR 신호가 red shift하였는데, 이는 열처리 후 InAs WL와 AlAs층 사이에 Al과 In의 내부 확산에 의해 양자점의 크기가 균일하게 재분포 되고, WL의 임계 두께가 증가하였음을 나타낸다. The optical characterization of self-assembled InAs/AlAs quantum dots(QD) grown by MBE were investigated using photoreflectance spectroscopy. The intensities of the signals of the GaAs buffer and wetting layer(WL) changed with the width of the WL layer. The PR spectrum for the sample, in which QDs layer were etched off at room temperature, indicated that the broadened signal ranging $1.1{\sim}1.4\;eV$ was originated from InAs QDs and WL. The intensities of signals of GaAs buffer and the WL changed with the WL width. A red shift of the PR peak of WL are observed when the annealing temperatures range from $450^{\circ}C$ to $750^{\circ}C$, which indicates that the interdiffusion between dots and capping layer is caused by improvement in size uniformity of QDs.

표면조도 특성에 따른 저항 점 용접성 평가 및 너깃 형성 고찰

김기홍,최영민,김영석,임영목,유지훈,강남현,박영도,Kim, Ki-Hong,Choi, Yung-Min,Kim, Young-Seok,Rhym, Young-Mok,Yu, Ji-Hun,Kang, Nam-Hyun,Park, Yeong-Do 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.5

With the increased use of surface textured steel sheet in body-in-white assembly, resistance spot weldability of these steels is considered to be an important subject. This study evaluated nugget formation and weldability by measuring dynamic resistance with various weld pressure, current, and weld time for steel sheet with two different surface roughnesses. The surface roughness for T-H steel ($R_{a}=1.70\;{\mu}m$) was higher than that for T-L steel ($R_{a}=1.33\;{\mu}m$), and resulted in increased contact resistance and heating for T-H steel spot welding. Therefore, at low weld current and weld cycle ranges, the T-H steel showed better weldability over the T-L steel. The evaluations of weld interface showed that the fusion zone in the T-H steel sheet was continuous in contrast to discontinuous fusion zone for T-L steel sheet at the same welding conditions. A comparison of dynamic resistance and tensile-shear strength (TSS) between T-H and T-L steel sheet suggested that high surface roughness provided larger heating at early cycle of welding and larger TSS.

Benedenia derzhavini (Trematoda : Monogenea) from Cultured Korean Rockfish, Sebastes schlegeli, in Korea

김기홍,권세련,Kim, Ki-Hong,Kwon, Se-Ryun 한국어병학회 1998 한국어병학회지 Vol.11 No.1

The benedeniine monogenean Benedenia derzhabini (Layman, 1930) Meserve, 1938 from cultured Korean rockfish, Sebastes schlegeli, is described and reported for the first time in Korea. The parasite was recovered from the gills and inner wall of operculum. B. derzhavini is distinguished from B. seriolae and B. sebastodis by the relative shape and length between the accessory sclerites and the hamuli. Benedeniidae과에 속하는 단생흡충류인 Benededia derzhavini(Layman, 1930) Meserve, 1938가 양식 조피볼락의 아가미와 아가미 뚜껑 내벽에 기생하고 있음을 국내에서 처음으로 보고하며, 아울러 이 종의 형태학적 특징을 자세히 기술하였다. B. derzhayini는 B. seriolae 및 B. sebastodis 등의 종들과 accessory sclerite와 hamuli의 형태 및 상대적인 길이 비율 차이에 의해서 구별되었다.

Spatial distribution of Microcotyle sebastis (Monogenea: Microcotyliidae) on Gills of the Cultured Korean Rockfish, Sebastes schlegeli

김기홍,최은석,지보영,Kim, Ki-Hong,Choi, Eun-Seok,Ji, Bo-Young 한국어병학회 1998 한국어병학회지 Vol.11 No.1

Distribution of a monogenean helminth Microcotyle sebastis on the gills of cultured Korean rockfish (Sebastes schlegeli) was investigated with regard to gill arches, sides of gill hemibranches (anterior or posterior), and their sections (dorsal, medial and ventral). M. sebastis has a significant preference for the second and third pair of gills, and shows marked affinity for anterior hemibranches of each gill branch, and medial sections of each gill hemibranch. The results suggest that the larger volume of water flows and surface area of the second and third pair of gills might affect the distribution of M. sebastis, and the concentrated distribution of M. sebastis on the anterior medial section of gills would be related with the increasing chances of mating by niche restriction. 양식 조피볼락에 기생하는 단생흡충류인 Microcotyle sebastis의 분포패턴을 아가미 새궁별, 새엽별(전방과 후방) 및 등면, 중앙면, 복면으로 구분하여 조사하였다. 조사 결과 M. sebastis는 제 2 및 제 3 새궁에 유의성 있는 선호도를 나타냈으며, 후방보다는 전방부의 새엽과 중앙 부위에서 집중적으로 발견되었다. 이러한 결과로 부터 각 아가미 새엽으로 들어오는 물의 양과 아가미의 표면적이 M. sebastis의 분포에 영향을 미칠 수 있는 것으로 여겨지며, 또한 전방 중앙부에 집중적으로 기생하는 원인은 미소서식처의 범위를 좁힘으로써 개체간의 접촉을 증가시기고, 이를 통해 교미의 효율을 높이기 위한 것으로 사료된다.

탄화실 부착카본 제거장치 개발

김기홍,이용국 ( Ki Hong Kim,Yong Kuk Lee ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2