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)

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.

대구지역 대학생 가족에서 족부 백선의 유병율

김기홍,조해욱,신동훈,최종수,방용준,서순봉 ( Ki Hong Kim,Hae Ook Cho,Dong Hoon Shin,Jong Soo Choi,Young Jun Bang,Soon Bong Suh ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.1

Background: Tinea pedis is one of the most comrnon dermatoses in the general population. But its prevalence in the general populat,ion was not yet reported in Korea. Objective : Prevalence of tinea pedis and associated tinea unguium were checked in the general population. Methods : Six hundred fifty eight persons from 179 families of the college students were evaluated. Clinical examinatior. for tinea pedis and onychomycosis and collecting scales from the suspicious lesions of the family members were perforrned by educated college students. Then dermatologists exarnined those specimens mycologically by KOH ~tnount and fungal culture. Results . The results were as follows 1. The prevalence of tinea pedis was 41.2% in the studied 658 persons. 2. Among all 271 patients with tinea pedis, 201 strains of dermatophytes were isolated. They were 143 strains of Trichophyton(T) rubrum, 49 strains of T. mentagrophytes and 9 mixed infections of T. rubrum and T. mentagrophytes. In the co existence of i,inea pedis and tinea unguiurn, isolated species were corresponding. 3. Among 179 families, 143 families (79.9%) had at least one patient with tinea pedis. The isolated species of derrnatophytes in a farnily were one organism, 71.4% and two or more organisms, 28.6% of 77 familiys with more than one patient. Conclusion : In our study, the prevalence rate of tinea pedis was 41.2%. That suggests that tinea pedis is a wide spr .ad disease in healthy adult in Korea. (Kor J Dermatol 1997;35(1): 114-120)

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.

근골격계 질환 예방에 관한 연구: 화물운전자를 중심으로

김기홍,정병현,Kim, Ki Hong,Chung, Byung Hyun 대한안전경영과학회 2021 대한안전경영과학회지 Vol.23 No.2

The possibility of developing musculoskeletal disorders increases with the length of service of the worker. Musculoskeletal disorders can occur when performing repetitive and forceful movements. Therefore, Cargo drivers operate repeatedly in the wrong posture for a long time. When loading and unloading a cargo, the cargo driver works repeatedly with force. Cargo operators are also exposed to musculoskeletal disorders in the working environment due to poor posture and repetitive movements. In this study, we are going to conduct a study on the level of awareness and prevention of the possibility of musculoskeletal disorders in cargo drivers for long periods of time. As a result of the study, the factors that cause musculoskeletal disorders in each group can occur during the long-term operation and preparation of drivers.

Pseudolepidapedon kobayashii (Digenea: Allocreadiidae) from the Olive Flounder (Paralichthys olivaceus) of the Korean Southern Sea

김기홍,권세련,안경진,허성회,Kim, Ki-Hong,Kwon, Se-Ryun,Ahn, Kyoung-Jin,Huh, Sung-Hoi 한국어병학회 1999 한국어병학회지 Vol.12 No.1

Pseudolepidapedon kobayashii collected from the alimentary canal of the olive flounder, Paralichthys olivaceus, which were caught at the Chinhae Bay, was reported for the first time in Korea, and P. olivaceus was recorded as a new host for P. kobayshii. The morphological characteristics of P. kobayashii were described and compared with the other species in the genus. 남해안에 서식하는 넙치의 장에서 이생흡충류에 속하는 Pseudolepidapedon kobayashii 1종을 국내에서 처음 기록하였으며, 넙치는 이 기생충의 새로운 종숙주로 밝혀졌다. 본 논문에서는 P. kobayashii의 형태학적 특징들을 기술하였고 같은 속내의 다른 종들과 형태학적 차이점을 비교하였다.

감자튀김시 Silicone Oil 의 튀김유 산화방지효과에 관한 연구

김기홍,정병상,심중환,배재오 ( Ki Hong Kim,Byoung Sang Chung,Joong Hwan Sim,Jae Oh Bae ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.2

키토산으로 표면처리된 인공치아의 충격전달에 관한 연구

김기홍,이용찬,조병욱,권익찬,최귀원,배태수,Kim, Ki-Hong,Lee, Yong-Chan,Cho, Byoung-Ouck,Choi, Kui-Won,Kwon, Ick-Chan,Bae, Tae-Soo 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.1

With the object of providing a temporary artificial periodonal ligament-like membrane around the dental implant, 10 Branemark type implants were coated with commercially available chitosan(Fluka Co., Buchs, Switzerland) which has a molecular weight of 70,000 and 80% deacetylation degree. Once this bioactive hydrophillic polymer(chitosan) contacts with blood or wound fluids, it becomes swollen and penetrates into the adjacent cancellous bone. Thus the interface between implant and surrounding bone is completely filled with chitosan. This tight junction in early healing phase enhances primary stability. The chitosan coated dental implants were implanted into the fresh patella bones from porcine knees, since the thickness of cortical bone is relatively even and their cancellous structure is homogenous. To test the shock absorbing effect, 1mm delta-rogette strain gage was installed behind the implant. The results showed 1. The principal strain peak value directed to the impact of coated implant was 0.064 0.018(p<0.05) and that of uncoated implant was 0.095(0.032 p<0.05). 2. The peak time delay of coated implant was 0.056sec(0.011 p<0.05) and that of uncoated implant was 0.024sec(0.009 p<0.05). It can be reasoned from this results that the chitosan coating has a shock absorbing effect comparable with a temporary artificial periodontal ligament.

The helminthic parasites of greenling, hexagrammos otakii Jordan et Starks, from the Korean southern sea

김기홍,허성회,지보영,Kim, Ki-Hong,Huh, Sung-Hoi,Ji, Bo-Young 한국어병학회 1997 한국어병학회지 Vol.10 No.2

A monogenean gill parasite, Prosomicrocotyla gotoi, and a digenean intestinal fluke. Opecoelus sphaericus, were found from greenilngs (Hexagrammos otakii) captured at the Korean southern sea. P. gotoi was characterized by having two separated frills of opisthaptor and distinguished from P. chirii in testis and clamp numbers. O. sphaericus had three pairs of finger-like marginal appendages on the ventral sucker and the parasite was distinguished from O. nipponicus in the location pattern of testes. These two helminth species were the first recording species in Korea. 한국 남해안에서 채집한 쥐노래미를 대상으로 기생성 연충류를 조사한 결과 아가미에 기생하는 단생흡충류, Prosomicrocotyla gotoi, 1종과 장관에 기생하는 흡충류, Opecoelus sphaericus, 1종이 발견되었다. 이 두종은 모두 우리나라에서는 처음 기록되는 미기록종들이었다. P. gotoi는 후고착반(opisthaptor)이 두갈래로 나뉘어진 frill형태에 의해 특징지워지며, 유사종인 P.chirii와는 고환과 clamp의 수에 의해 구별되었다. O. sphaericus는 복흡반의 가장자리에 3쌍의 손가락 모양 돌기가 나 있었으며, 유사종인 O. nipponicus와는 고환의 위치에 의해서 구별되어졌다.