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)

쏘일네일의 길이평가를 위한 비파괴 기법의 적용

김기홍,김낙영,이종섭,유정동,Kim, Ki-Hong,Kim, Nag-Young,Lee, Jong-Sub,Yu, Jung-Doung 한국터널지하공간학회 2015 한국터널지하공간학회논문집 Vol.17 No.2

쏘일네일은 지반과 네일간에 발생하는 마찰특성을 이용하여 지반을 보강하기 때문에 쏘일네일의 길이는 지반의 안정성에 매우 중요한 요소이다. 이와 같은 이유로 쏘일네일의 길이를 정확히 평가하여 지반의 안정성을 확보해야 한다. 본 연구는 쏘일네일의 길이를 평가하는 기법을 개발하기 위한 기초 연구로써 비파괴기법의 적용성을 제시하고자 한다. 첫째, 커플러로 연결된 철근에도 적용 가능한 기법을 개발하기 위해 초음파와 전자기파를 적용한 실험을 수행하였다. 실험 결과, 초음파는 커플러의 영향으로 신호를 측정할 수 없는 반면, 전자기파의 경우 커플러의 영향 없이 신호를 측정할 수 있었다. 둘째, 쏘일네일의 길이에 따른 전자기파 신호양상을 파악하기 위해 1 m~15 m의 길이가 되도록 철근을 조합한 후, 전자기파를 측정하였다. 그 결과, 철근의 길이가 증가할수록 전자기파의 도달시간이 증가하는 것으로 나타났다. 또한, 기 설치된 쏘일네일에도 적용할 수 있도록 접지선을 이용한 실험도 수행하였다. 실험결과, 접지선을 이용한 경우에도 철근의 길이가 증가할수록 전자기파의 도달시간도 증가하는 것으로 나타났다. 본 연구의 결과는 전자기파가 쏘일네일의 길이를 평가하기에 유용한 기법임을 보여준다. As soil nails support a ground by the friction between nails and soils being reinforced, the length of soil nails is important factor for a ground stability. Thus, the soil nail length has to be accurately evaluated in order to secure a ground stability. The goal of this study is to suggest the applicability of the non-destructive method as the basic research for the evaluation of the soil nail length. First, the elastic and electromagnetic waves are adopted to select an applicable method for the soil nails connected by the coupler. Test results show that while the ultrasonic waves are not detected due to the coupler, the electromagnetic waves are free for the influence of the coupler. Second, electromagnetic waves are measured for combined soil nails with the length of 1 m~15 m for the investigation of the characteristics of electromagnetic waves. The travel time of the electromagnetic wave increases with an increase in the soil nail length. In addition, the ground cable is used to apply the electromagnetic waves to pre-installed soil nails. Test results show that the travel time of the electromagnetic wave by using the ground cable increases with an increase in soil nail length. This study demonstrates that the electromagnetic wave may be a promising method for the evaluation of the soil nail length.

Prediction of elevated intracranial pressure using quantitative electroencephalogram in a porcine experimental traumatic brain injury model

김기홍,( Heejin Kim ),( Ki Jeong Hong ),( Kyoung Jun Song ),( Sang Do Shin ),( Hee Chan Kim ) 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.2

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.

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.

크로스도킹 거점 결정을 위한 연구 -지역거점을 중심으로-

김기홍,Kim, Ki-Hong 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.3

The respective delivering vehicle loaded with the own cargo moves into the respective delivery area. At the base, the delivery points D1 and D2, for example, have the same starting point but the destination is different. The average delivering time of the delivery vehicle is mostly more than 8 hours a day. Therefore, the efficiency of delivery is generally low. In this study, the deliveries will be forwarded from a base station to a delivery point where cross docking will be applied to a single vehicle, and will be distributed from the cross docking point through cross docking. If the distribution is implemented, one vehicle will not have to be operated from the base to the cross docking point. In that case, logistics cost will be reasonably saved by the reduction of transportation cost and labor time. If one vehicle only runs from the base to the cross docking point, each vehicle will be operated in two shifts, and the vehicle operation can be efficiently implemented. This research model is based on the assumption that the 3 types of ratios between the traffic volume of the vehicles starting at the base and the vehicles waiting at the cross docking point are set to the first ratio of 30% to 70%, the second ratio of 50% to 50% and the final ratio of 70% to 30%. As a result of the study, The delivery time in the cross docking point is much higher than that in present on the condition that the cargo volume in the D2 area is more than 50%. Likewise, the delivery time is slightly higher on the condition that the cargo volume is less than 50%. Time is reduced in terms of 50% model like AS-IS model.

물류 종사자의 성격유형이 물류생산에 미치는 영향

김기홍,Kim, Ki-Hong 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.3

In order to increase the productivity of the logistics center and transportation, we try to articulate the priority ranking factors of the productivity influenced by the personality of the field workers (logistics center workers) and functional workers (drivers) via the AHP technique Individual personality was studied by applying the Big 5 model of psychological factors (openness, Conscientiousness, extroversion, Agreeableness, neuroticism). In this paper, extraversion was critically analyzed as a priority factor. A trait of extroversion is a strongly active and individual personality. In this study, the field workers are logistics center workers and the functional workers are drivers. They are interactively influenced in the In & Out operation. For example, when it comes to 'up and down work' and 'inspection work', the functional workers perform 'up and down work' and 'delivery work' and the field workers perform 'inspection work'. Stressing on the respective work has an affect on work productivity. Inspection workforce has something to do with inventory management. Functional workforce affects the delivery workforce. Delivery work is positively correlated with customer satisfaction. Nevertheless, as a result of research, extrovert personality that has something to do with an energetic activity would not affect on the implementation of their operation. In addition, personal extraversion of workers and drivers in the warehouse can have a significant impact on job commitment and productivity improvement.

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.

In_xGa_1-xN/GaN 다중양자우물 구조의 광학적 성질 연구

김기홍,김인수,박헌보,배인호,유재인,장윤석,Kim, Ki-Hong,Kim, In-Su,Park, Hun-Bo,Bae, In-Ho,Yu, jae-In,Jang, Yoon-Seok 한국진공학회 2009 Applied Science and Convergence Technology Vol.18 No.1

$In_xGa_{1-x}N$/GaN 다중양자우물 구조의 EL 특성을 온도와 주입전류 변화에 따른 특성을 조사하였다 저전류와 고전류 주입시 EL 효율의 온도 의존 변화는 매우 다르게 나타나는데, 이러한 온도와 전류의 변화에 의한 독특한 EL 효율의 변화는 내부전기장의 존재 하에 순방향 바이어스에 기인한 외부전기장의 영향인 것으로 볼 수 있다. 그리고 $In_xGa_{1-x}N$/GaN 다중양자우물 구조에서 In 성비의 증가는 발광파장위치의 적색이동을 보였다. 15K에서 주입 전류의 증가에 따라 녹색 양자우물 구조는 80 meV와 청색 양자우물 구조는 22 meV의 청색 편이를 하였다. 이는 전류의 증가에 의해 단위 시간당 생성되는 캐리어 수가증가하게 되고 그에 따라 subband가 급격히 채워지는 band filling 현상이 일어나게 되어 짧은 파장에서 재결합이 증가하기 때문이다. 그리고 청색과 녹색 다중 양자우물구조의 짧은 파장 쪽으로의 편이 차이는 In 농도에 기인한 것으로 In 농도가 높으면 양자우물 깊이가 증가되어 더 강한 양자속박효과가 작용하여 캐리어 구속력이 증가하기 때문 것으로 볼 수 있다. Temperature and injection current dependence of electroluminescence(EL) spectral intensity of the $In_xGa_{1-x}N$/GaN multi-quantum wells(MQW) have been studied over a wide temperature range and as a function of injection current level. It is found that a temperature-dependent variation pattern of the EL efficiency under very low and high injection currents shows a drastic difference. This unique EL efficiency variation pattern with temperature and current can be explained field effects due to the driving forward bias in presence of internal(piezo and spontaneous polarization) fields. Increase of the indium content in $In_xGa_{1-x}N$/GaN multiple quantum wells gives rise to a redshift of 80 meV and 22 meV for green and blue MQW, respectively. It can be explained by carrier localization by potential fluctuation of multiple quantum well and MQW structures also shows a keen difference owing to the different indium content in InGaN/GaN MQW.