소아용 심미수복재의 방사선 불투과성에 관한 연구

정태성,김신,Jeong, Tae-Sung,Kim, Shin 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.1

현재 사용중인 소아용 심미수복재 8종(글라스 아이오노머 및 레진계)에 대한 방사선 불투과성을 치아의 법랑질 및 상아질과 비교하였다. 다양한 방사선 노출조건에 따른 알루미늄 stepwedge에 대한 표준곡선의 변이를 알아보고, 그 중 안전하고 적절한 노출 조건을 선택하여 촬영한 10종류의 소아수복용 심미 수복재에 대한 방사선 사진을 디지털화 한 다음 방사선 불투과성의 정도를 그 화상을 분석하는 방법으로 알루미늄 두께로 환산하여 비교함으로써 상대적인 방사선 불투과성을 알아보았다. 실험에 사용된 모든 심미수복재는 상아질보다 방사선 불투과상을 나타내었으며, FP, VB, VM에서는 유치 법랑질과 방사선 불투과성이 차이가 인정되지 않았으나 이외의 재료에서는 법랑질보다 높은 방사선 불투과상을 보였다. 금속입자가 함유된 KF 에서 방사선불투과성이 가장 높은 것으로 나타났으며 VM에서 방사선불투과성이 가장 낮게 나타났다. 소아용 심미 수복재가 유치 법랑질보다 높은 방사선 불투과성을 가지기 위해서는 동일한 알루미늄 두께인 1.7mm보다 더 두꺼워야 한다. The aim of this study was to investigate the level of radiopacity of esthetic dental restorative materials and determine the optimum level of radiopacity in pediatric dentistry. Disks of 8 dental restorative material groups as the experimental group, 7mm in diameter and 2mm thick, were radiographed with intact human deciduous teeth and aluminum stepwedge standard. Radiopacity was evaluated with an image analysis program following the digitization of the radiographs using a flatbed scanner with transparency unit. All materials and tooth structure also the significant difference except FP, VB, VM. For the radiopacity of esthetic restorative dental materials to exceed that of enamel, it should be greater than 1.7mm of equivalent thickness of aluminum.

토마토 반촉성 시설 재배에서 천적중심 온실가루이와 총채벌레 관리모델

정태성,황미란,황세정,이재홍,이안수,원헌섭,홍대기,조점래,함은혜,Jeong, Tae-Sung,Hwang, Mi-Ran,Hwang, Se-Jung,Lee, Jae-Hong,Lee, An-Soo,Won, Heon-Seop,Hong, Dae-Ki,Cho, Jum-Rae,Ham, Eun Hye 한국응용곤충학회 2017 한국응용곤충학회지 Vol.56 No.4

춘천지역 농가 및 강원도농업기술원 내 시험포장에서 반촉성재배토마토(2~6월)에서 트랩을 이용한 주요 해충의 발생밀도와 천적 등을 이용한 방제효과를 조사 하였다. 토마토 재배농가에서 주로 사용하는 약제와 유기농자재의 천적곤충에 대한 독성평가도 수행하였다. 반촉성재배 시 발생되는 주요 해충은 온실가루이(Trialeurodes vaporariorum)와 총채벌레류이었다. 온실가루이의 경우 4월 중순경부터 발생하기 시작하여 5월 중순 이후 발생이 증가하였고, 총채벌레류는 4월 상순 경 발생을 시작하여 6월 이후에 증가하는 경향을 보였다. 저독성약제 선발시험을 통해 온실가루이와 총채벌레의 천적인 온실가루이좀벌과 미끌애꽃노린재에 대해 60% 이하의 독성을 보이는 살충제 1종(spiromesifen SC), 살균제 1종(cyazofamid SC) 및 님 추출물이 함유된 유기농자재 외 1종을 선발하였다. 이상의 결과에서 제시한 천적중심 관리모델을 적극적으로 활용한다면 토마토 반촉성 시설재배 시 온실가루이와 총채벌레를 효율적으로 관리할 수 있을 것으로 기대된다. To investigate the control effect of insect pests by natural enemies, sticky traps were used in commercial tomato greenhouses in Chun-cheon and the experiment fields of Gangwon-do Agricultural Research and Extension Services, Republic of Korea using semi-forcing culture (February to June). We selected low toxicity pesticides, environment-friendly agricultural materials (EFAM), and natural enemies of the study species, combinations of which have been previously used in farms to control insect pests. In this study, Trialeurodes vaporariorum and thrips, which are major agricultural insect pests, were studied in experimental greenhouses. The adult T. vaporariorum population was observed in mid-April and the population of thrips showed occurrences in early April. Regarding seasonal fluctuation, T. vaporariorum peaked in mid-May and thrips peaked after June. one insecticide, spiromesifen suspension concentrate (SC); one fungicide, cyazofamid SC; and two EFAMs containing neem tree extract were shown to be slightly toxic to Encarsia formosa and Orius laevigatus. The results of this study could be used to develop management models using natural enemies of control the insect pests; T. vaporariorum and thrips in semi-forcing culture of tomato.

유전자형에 따른 Streptococcus mutans의 subtyping: Southern blot RFLP와 AP-PCR을 이용한 비교

정태성,김신,Jeong, Tae-Sung,Kim, Shin 대한소아치과학회 1998 大韓小兒齒科學會誌 Vol.25 No.2

The arbitrary primer polymerase chain reaction(AP-PCR) and Southern blot restriction fragment length polymorphism(RFLP) were used to genotype the cariogenic pathogen S. mutans in children. Following the morphologic chracteristics of colony on selective medium for S. mutans, total genomic DNA from 155 strains was extracted by conventional methods. Among 155 strains, 143 strains (92.3%) were confirmed S. mutans by PCR with dexA gene and 114 strains were used in this study. Three random sequence 10-base oligonucleotide primers were chosen for AP-PCR. The amplified DNA products were separated electrophoretically in a 2% agarose gel containing ethidium bromide and the banding patterns were compared among different strains. For RFLP analysis, DNA was digested with EcoRI and BamHI, separated on a 0.7 % agarose gel and transferred to a nylon membrane. The membrane was probed with a previously characterised 1.6 kilobases (kb) DNA fragment cloned from gtf B gene of S. mutans. The probe was labeled with isotope[$^{32}P-{\alpha}CTP$], and hybridized fragments were detected with intensifying screen. AP-PCR produced 4-8 DNA bands in the 0.25-10 kb regions and distinguished 9, 10 or 12 genotypes, depending on the specific primer used. Southern blot RFLP analysis revealed 2 hybridization patterns consisting of 1 DNA fragments 450, 500 bp. These results indicate that AP-PCR is more discriminative method for genotyping of S. mutans.

광중합 Glass Ionomer Cement와 Amalgam의 결합강도에 관한 연구

정태성,Jeong, Tae-Sung 대한소아치과학회 1996 大韓小兒齒科學會誌 Vol.23 No.2

소아치과 임상에서 자주 사용되는 3 종의 광중합형 GIC의 아말감에 대한 접착능을 평가 할 목적으로 60 개의 아말감 부착시편을 이용하여 중간결합제인 Scotchbond 의 사용여부에 따른 경화된 아말감에 대한 광중합 GIC의 전단결합강도를 측정하고 경계부의 파절양상을 관찰한 결과, 다음과 같은 결론을 얻었다. 1. 아말감에 대한 광중합형 GIC의 전단강도는 Fuji II LC, Vitremer, Vitrebond의 순으로 높게 나타났다 (p<0.05). 2. 중간결합제인 Scotchbond를 사용하지 않은 경우에서 Scotchbond 를 사용한 경우에 비해 전단결합강도가 높게 나타났다(p<0.05). 3. 결합파절면은 Scotchbond를 사용한 경우의 대부분에서 Scotchbond와 아말감의 경계부에서 시편의 탈락이 나타났다. 아말감과 광중합 GIC의 결합을 시도할 경우에는 Scotchbond는 사용하지 않는 것이 바람직할 것으로 사료되었다. The purpose of this study was to asses the shear bond strengths of 3 types of light-curing Glass Ionomer cement to dental amalgam with or without an intermediary agent. 60 amalgam adherent specimens were prepared and aged in water at $37^{\circ}C$ for 3 days. Before bonding, the amalgam surfaces were finished flat on 600-grit silicon carbide paper. 30 specimens among 60 were used for bonding in this condition, and the other 30 were covered with a thin layer of light-curing intermediary agent. Shear bond strengths were measured with universal testing machine (Instron, Model 4301) and statistically processed by ANOVA and t-test. On completion of bond test, the fracture surfaces were examined under light microscope so that the mode of bond failure could be assessed The results were as follows : 1. Bond strength of Fuji II LC group showed the hightest value and was followed by Vitremer, Vitrebond groups (p<0.05). 2. The bond strengths achieved without an intermediary agent were higher than those obtained with intermediary agent (p<0.05). 3. For the specimens bonded with intermediary agent, bond failures occured mostly at the agent-amalgam interface. So, the use of intermediary bonding agent was thought not recommendable at glass ionomer-amalgam interface.

상아질의 표면 ZOE처리가 글래스아이오노머 시멘트의 전단강동에 미치는 영향에 관한 연구

정태성,김경덕,Jeong, Tae-Sung,Kim, Kyung-Deok 대한소아치과학회 1998 大韓小兒齒科學會誌 Vol.25 No.2

The purpose of this study was to asses the shear bond strengths of 3 types of glass ionomer cement and 1 type of composite resin to dentinal surface with or without ZOE pretreatment. 80 extracted tooth specimens are divided into two groups; the control group (40 specimens) is not treated with ZOE and the other(40 specimens) is ZOE pretreated during 24 hours before bonding procedure. Shear bond strengths were measured with universal testing machine (Instron, Model 4301) and statistically processed by ANOVA and t-test. The results were as follows: 1. Bond strength of the ZOE treated experimental group showed lower than the control group, except chemical cured glass ionomer cement(p<0.05). 2. After ZOE surface treatment, the bond strength of composite resin was superior than glass ionomer cement and all experimental group was decreased (p<0.05). 3. It has nothing to do with ZOE surface treatment, that chemical curing glass ionomer cement was showed lowest bond strength.

CrPt₃(001) 박막의 자성

정태성(Tae Sung Jeong),제갈소영(Soyoung Jekal),임성현(S. H. Rhim),홍순철(S. C. Hong) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.2

Recent study shows that ordered alloy of L1₂ XPt₃ (M= V, Cr, Mn, Co, and Fe) exhibits various magnetic phases such as ferromagnetic-to-antiferromagnetic transition at the MnPt₃ surface. Moreover, it has been argued that CrPt₃, in particular, possess large magnetocrystalline anisotropy and Kerr rotation with possible violation of Hund’s rule. As such, we extend our work to thickness dependence of the magnetic structure of CrPt₃ thin film using density functional theory. Magnetic ground state of the bulk CrPt₃ turns out to be ferromagnetic (FM), where other magnetic phases such as A-type (A-AF), C-type (C-AF), and G-type antiferromagnetic (GAF) state have higher total energies than FM by 0.517, 0.591, and 0.183 eV, respectively, and magnetic moments of Cr in bulk are respectively 2.807 (FM), 2.805 (A-AF), 2.794 (C-AF) and 2.869 μ<SUB>B</SUB> (G-AF). We extend our study to CrPt₃(001) thin films with CrPtand Pt-termination. The thickness and surface-termination dependences of magnetism are investigated for 3-9 monolayers (ML), where different magnetic phases from bulk emerge: C-AF for CrPt-terminated 3ML and G-AF for Pt-terminated 5ML have energy difference relative to FM by 8 and 54 meV, respectively. Furthermore, thickness- and surface-termination-dependent magnetocrystalline anisotropies of the CrPt₃(001) films are discussed.

칼슘과 비타민 D 섭취가 골다공증이 유발된 백서의 임플란트 매식 주위 뼈조직에서 오스테오칼신과 오스테오폰틴의 발현에 미치는 영향

정태성 ( Tae Sung Jeong ),김규천 ( Gyoo Cheon Kim ),김효근 ( Hyo Geun Kim ),이재열 ( Jae Yeol Lee ),강영훈 ( Young Hoon Kang ),신상훈 ( Sang Hun Shin ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4

The purpose of this study was to observe the effect of calcium and vitamin D intake to the expression of osteocalcin and osteopontin in the osteoporosis-induced animal model. 40 rats, 10 weeks of age, were divided into two group: additional calcium and vitamin D supplementation group and a control group. Titanium screw implant(diameter, 2.0 mm; length, 3.5 mm; pitch-height 0.4 mm) were placed into tibia of 40 rats, 20 in the control group and 20 in the experimental group. The rats were sacrificed at different time interval(1, 2, and 4 weeks after implantation) for immunohistochemistry with osteocalcin and osteopontin. In experimental group, osteocalcin immunoreactivity was stronger than control group. However, osteocalcin expression was gradually decreased in control group. Osteopontin immunoreactivity has no difference between experimental and control group. The results of this study suggest that calcium and vitamin D supplementation promote osteocalcin expression around titanium implants in osteoporotic patients.

강원지역의 꽃매미 발생상황과 동계 기온변화에 따른 발생양상

정태성 ( Tae Sung Jeong ),황미란 ( Mi Ran Hwang ),문윤기 ( Youn Gi Moon ),이재홍 ( Jae Hong Lee ),이남길 ( Nam Gil Lee ),권순배 ( Soon Bae Kwon ),김인종 ( In Jong Kim ),최병렬 ( Byeong Ryel Choi ) 한국토양동물학회 2015 한국토양동물학회지 Vol.19 No.1

Lycorma delicatula in Gangwon province occurred firstly in 2008 in Chuncheon and Wonju. Its occurrence increased to 36.8 ha in 2011, but decreased to 11.8 ha, 8.7 ha in 2012 and 2013, respectively. In 2014 and 2015, it is again on the increase as 22.1 ha and 47.2 ha. For clarifying changes of occurrences, this study was compared with minium temperature of winter season, hatching rate of over-wintering eggs and occurrence status in grape orchard from 2011 to 2015. Elapsed days in - 10℃ and - 19℃ below of winter season greatly influenced on hatchability of over-wintering eggs and showed close correlation for change of occurrence area in Gangwon province.

이상기온에 따른 5년생 인삼 조기발뇌 특성 및 해가림 재료별 동해피해 발생 양상

정햇님(Haet-Nim Jeong),정태성(Tae-Seong Jeong),허수정(Su-Jeong Heo),김성일(Sung-Il Kim),조윤상(Youn-Sang Cho),안문섭(Mun-Seob Ahn),김영창(Young-Chang Kim),김동휘(Dong-Hwi Kim),이성우(Sung-Woo Lee),차선우(Seon-Woo Cha) 한국약용작물학회 2012 한국약용작물학회 학술대회논문집 Vol.2012 No.1

세천에서의 홍수량 산정 방법론 평가

정태성(Tae Sung Cheong),황신범(Shinbum Hwang),박종렬(Jongryul Park),오국열(Kukryul Oh),정상만(Sangman Jeong) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.5

경제개발 초기에 설치된 소규모 공공시설은 노후화로 인해 재난 리스크가 증가하고 있어 행정안전부는 이들 시설의 취약성을해소하고 피해를 저감하기 위해 「소규모 공공시설 안전관리 등에 관한 법률」을 제정하고 설계를 위한 가이드라인을 제공하고있다. 본 연구에서는 가이드라인에서 제시하고 있는 홍수량 산정 방법인 Clark 단위도법과 합리식의 적용성을 평가하였다. 평가를 위해 도심지, 농경지, 산지에 위치한 3개 세천 유역을 시범유역으로 선정하였으며, 세천 하류부에 위치한 소하천의계측 유량을 면적비유량법으로 세천의 계측 유량으로 결정하였다. 각 세천에서 구한 첨두 홍수량을 결정유량과 비교한 결과, 모든 세천에서 Clark 단위도법과 합리식은 첨두 홍수량을 결정유량보다 크게 산정하는 것으로 나타나 이들 방법은 안전성측면에서 세천의 홍수량 산정에 적용 가능한 것으로 평가되었다. 그러나 보다 정밀한 홍수량 검증 및 최적 결정방법 선정을위해서는 세천에 대한 수리⋅수문학적 자료를 계측하고 유역 및 하도에 대한 특성 정보를 수집하는 등의 지속적인 연구가필요하다. As the small public facilities established in the early stages of economic development are at increased risk of disasters due to aging, the Ministry of the Interior and Safety established the “Law of Safety Management on Small Public Facilities” and provided guidelines for reducing vulnerabilities and damages. In this study, the applicability of the Clark unit hydrograph method and a rational formula, which are methods suggested in the guidelines for predicting flood discharges, are evaluated. For the evaluation, three creek basins located in urban, agricultural, and mountainous areas are selected as test watersheds, and the measured flow discharges of small streams downstream of the creeks are determined using the area ratio flow method. The evaluation results show that, for all three creeks, the peak flood discharges predicted using both the Clark unit hydrograph method and the rational formula are greater than those determined using the area ratio flow method ; therefore, the first two methods can be used to predict flood discharges in creeks to ensure safety. However, for a more precise verification of flood discharges and for selecting optimal methods, continuous investigations are required for measuring the hydrological and hydraulics data of the creek and obtaining characteristic information regarding watersheds and channels.