82Sr/82Rb 발생기의 제조 및 정상인 심근의 양전자 단층촬영상

정재민,정준기,이동수,곽철은,이경한,이명철,고창순 ( Jae Min Jeong,June Key Chung,Dong Soo Lee,Cheol Eun Kwark,Kyung Han Lee,Myung Chul Lee,Chang Soon Koh ) 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.3

A Sr/Rb generator was prepared by loading Sr to preconditioned tin dioxide column. The generator was eluted by normal saline with flow rate up to 8ml/min, and the eluted radioactivity was monitored by dose calibrator. Radioactivity began to come out at 5ml and reached to peak around 9ml. The total eluted radioactivity increased linearly with flow rate, and the maximum obtained radioactivity was 35mCi at 8ml/min. The Rb preparation was proven to be free from both strontium radioactivity and pyrogen. The Rb was injected to normal female valunteer and positron emission tomographic image of heart was obtained successfully.

신장기능영상용 방사성의약품 Bz - MAG3 ( Benzoylmercaptoacetylglycylglycylglycine ) 의 키트화 및 체내분포

고창순(Chang Soon Koh),이명철(Myung Chul Lee),정준기(June Key Chung),이동수(Dong Soo Lee),김영주(Young Ju Kim),정재민(Jae Min Jeong),장영수(Young Soo Chang),조정혁(Jung Hyuk Cho) 대한핵의학회 1996 핵의학 분자영상 Vol.30 No.3

N/A The MAG3 is a tubular excreting radiopharmaceutical for renal image. We synthe-sized benzoyl MAG3 (Bz-MAG3) and made a kit for labeling with Tc-99m. We checked the labeling effeciency of Tc-99m labeled MAG3 and biodistribution. Labeling efficiency was checked by TLC- SG (acetonitrile/H2O=2/1). After injecting of 1 mCi of Tc-99M-MAG3 to ICR-mice, Tmax(min), T1/2(min) were obtained in the renogram. Sequencial images (30sec, 2min, 5min, 10min, 15min, 20min) of TC-99m-MAG3 were compared with those of commercial Tc-99m-DTPA (Du Pont Merck Pharmaceutical Co.) kit. 1) The Rf value of synthesized Tc-99m-MAG3 was 0.78 and labeling efficiency was 97.5±1.9% (n=10). 2) The dynamic images of the Tc-99m-MAG3 were better than those of the Tc-99m-DTPA. 3) The Tmax(min.) and T1/2(min.) of Tc-99m-MAG3 (n=10) were 1.5±0.5 (left), 1.4±0.4(right), and 4.3±1.4 (left), 4.8±2.0 (right), respectivel. The Tmax(min.) and T1/2(min.) of Tc-99m-DTPA (n=7) were 2.7±1.6 (left), 2.7±1.6 right), and 3.8±1.7 (left), 4.5±2.7 (right), respectively. The quaility of image and labeling efficiency of the synthesized Bz-MAG3 kit were excellent, that it was supposed to be used in routine clinical work.

Knitted Glass Fabric 강화 복합레진을 사용한 고정성 치과보철물에 대한 적용성 평가

정재민,이규복,조광헌,Chung Jae-Min,Lee Kyu-Bok,Jo Kwang-Hun 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.5

Current dental restorations present a relatively weak resistance to fracture. Owing to their unique mechanical properties, fibre-reinforced polymers are now being considered. Unidirectional or woven continuous fibres, made of glass, polyethylene, carbon or Kevlar, have been evaluated. This study focused on the use of glass fibre knitted fabrics to reinforce acrylate resins, in order to investigate the possibility to construct single crowns as well as three unit bridges. Some points affecting the final composite system were tested ; 1) static strength, with focus on the stress transfer under a occlusal contact point ; 2) modelling of a three nit bridge ; 3) fatigue strength as a posterior three unit bridge material. The study demonstrated that knitted fabric reinforcements are showing an interesting compromise between stiffness, static strength for single crown. For three unit bridge applications in the posterior arch, however knitted glass fabric reinforcements were not strong enough in fatigue An additional reinforcement in the posterior arch fixed partial denture design was recommended.

임플란트 경부형상이 주위골 응력에 미치는 영향에 관한 유한요소법적 분석

정재민,조광헌,이청희,유원재,이규복,Chung, Jae-Min,Jo, Kwang-Heon,Lee, Cheong-Hee,Yu, Won-Jae,Lee, Kyu-Bok 대한치과보철학회 2009 대한치과보철학회지 Vol.47 No.4

연구목적: 임플란트 경부의 치은관통부 형상이 주위골 응력분포에 미치는 영향에 대해 조사하고자 한다. 연구재료 및 방법: 높이 2.8 mm, 상부 직경 4 mm, 하부 직경 2.7 mm 인 직선형 치은관통부를 가지는 ITI의 일체형(one piece) 임플란트 (Straumann, Waldenburg, Switzerland)를 Base Model로 사용하여, 치은관통부 외형에 함몰부를 부여하여 곡선형으로 수정한 4개의 해석 모델 (Model-1, -2, -3, -4)을 설정하였다. Base Model을 포함, 모두 5개의 경우에 대해 축대칭 유한요소모델링을 통해 임플란트 장축에 평행인 수직 방향과 임플란트 장축에 $30^{\circ}$ 경사진 방향으로 각각 50 N의 힘이 작용할 때 발생되는 임플란트 주위골의 응력을 해석하여 비교하였다. 체계적인 응력비교를 위해 임플란트 주위에 19개의 절점을 응력 관찰점으로 선정하였으며, 경부 치밀골에 설정된 5개 관찰점의 응력으로부터 회귀분석법으로 임플란트/골 사이에서 생기는 최대응력값을 추정하여 정량적인 비교를 실행하였다. 결과: 최대 골응력은 치은관통부가 직선인 기본모델에서 가장 컸으며, 치은 관통부를 곡선으로 설계한 경우 응력이 감소되었다. 치은 함몰부가 클수록 응력감소 정도가 커졌으며 함몰부의 수직위치가 몸체부에 가장 가까운 Model-4에서 응력감소 정도가 전체의 약5%로 가장 컸다. 결론: 임플란트의 경부 형상은 골응력에 영향을 미치며, 이를 곡선형으로 함으로써 또한 그 함몰부를 몸체부에 근접하게 함으로써 경부골 응력감소를 효과적으로 도모할 수 있다. Statement of problem: Crestal bone loss, a common problem associated with dental implant, has been attributed to excessive bone stresses. Design of implant's transgingival (TG) part may affect the crestal bone stresses. Purpose: To investigate if concavely designed geometry at a dental implant's TG part reduces peri-implant bone stresses. Material and methods: A total of five differently configured TG parts were compared. Base model was the ITI one piece implant (Straumann, Waldenburg, Switzerland) characterized by straight TG part. Other 4 experimental models, i.e. Model-1 to Model-4, were designed to have concave TG part. Finite element analyses were carried out using an axisymmetric assumption. A vertical load of 50 N or an oblique load of 50 N acting at $30^{\circ}$ with the implant's long axis was applied. For a systematic stress comparison, a total of 19 reference points were defined on nodal points around the implant. The peak crestal bone stress acting at the intersection of implant and crestal bone was estimated using regression analysis from the stress results obtained at 5 reference points defined along the mid plane of the crestal bone. Results: Base Model with straight configuration at the transgingival part created highest stresses on the crestal bone. Stress level was reduced when concavity was imposed. The greater the concavity and the closer the concavity to the crestal bone level, the less the crestal stresses. Conclusion: The transgingival part of dental implant affect the crestal bone stress. And that concavely designed one may be used to reduce bone stress.

울릉도 나리분지 주변 산림의 임분구조 및 동태

정재민 ( Jae Min Chung ),황선미 ( Sun Mi Hwang ),김유미 ( Yoo Mi Kim ),신재권 ( Jae Kwon Shin ),김명수 ( Myong Soo Kim ) 한국농림기상학회 2010 한국농림기상학회지 Vol.12 No.1

For the sustainable conservation of forests within and around the somma of Nari basin in Ulleung Island, the stand structure and dynamics with the aspect, altitude and stand types were estimated by using analyses of importance value, plant species diversity, Sørensen`s similarity index and distributions of diameter classes. Results of the importance value analysis with vegetation stories on each stand showed that Fagus engleriana and Acer okamotoanum were dominant in most stands regardless of the aspect and altitude of the forest around the somma of Nari basin and the plant species composition among stands was not significantly different. The forest within Nari basin was composed of pine, beech, alder and deciduous-mixed stand. Moreover, the species composition was greatly different among the four stands. The diversity of plant species within stand was in general higher within Nari basin than around the somma, and among stands within Nari basin, the plant species diversity of pine and deciduous-mixed stand showed higher values than that of beech and alder stands. The similarity index among stands with aspect and altitude showed that the index among stands of eastern, western and northern slope in forest around the somma and forest within the basin ranged from 0.68 to 0.69, and the similarity among four stands with altitude was very high having index range from 0.85 to 0.95. The patterns of diameter class distribution of the major dominant species from four altitude classes followed an almost normal bell-shaped distribution. The results were interpreted as an indication that these forests will in general maintain a stable stand structure. Therefore, despite diverse topographic features around Nari basin, the stand structure and plant species composition among stands were not diversified as expected. For the conservation of diversity of forest plant species and of forest ecosystems, a promising and intensive program should be considered.

Quincas Borba에 나타난 화자와 아이러니의 의미

정재민 ( Chung Jae Min ) 한국포르투갈-브라질학회 2006 포르투갈-브라질 연구 Vol.3 No.1

브라질의 사실주의 작가 Machado de Assis의 대표적 소설작품 중 하나인 Quincas Borba는 무엇보다 독특한 화자의 기능이 서사적 특징이라 할 수 있다. 이 작품의 화자는 단순히 스토리를 전달하는 관습적 기능을 초월하여 복합적 서사기능을 수행하고 있다. 일인칭 전지적 시점으로 서술되는 이 소설의 화자는 거의 모든 스토리 진행과정에 직접적으로 간섭하고 있는데 그 서술간섭의 행태는 상당히 역동적이며 서사적 거리 또한 다양하게 변화한다. 서술 사이사이에 독자들을 환기시켜 자신의 서술에 참여토록 끌어들이거나 심지어는 독자들을 비꼬기도 하는 이 화자는 등장인물, 독자를 비롯하여 화자 자신까지 아우르는 다양한 층의 서사관계망 속에서 냉소적인 아이러니로 위장하며 또 하나의 주요 등장인물로 떠오른다. 여기서 화자가 의도하는 바는 첫째, 화자로서의 시점을 복수화시키고 감성적 태도를 중층화시킴으로써 서술적 진실의 객관성을 높이려는 데 있는 것으로 보인다. 둘째, 화자 자신이 관찰자로서의 소극적인 태도를 벗어나 아이러니로 무장한 회의적 등장인물로서 서술의 전면에 등장함으로써 작가 자신의 목소리를 통한 창조적 서사물의 내재적 의미의 드러내기를 더욱 주요한 서사기능으로 승격시키려는 의도로 분석된다. Machado de Assis는 이처럼 복합적이고 다양한 기능을 수행하는 Quincas Borba의 화자가 끊임없이 독자에게 투사하는 아이러니를 통해 주인공의 의식적, 무의식적 죄의식을 비꼬면서 인간의 내면을 지배하는 도덕성을 냉소주의와 비관주의로 함께 비판하고 있다.

희귀식물 꼬리겨우살이의 분포와 생태적 특성 및 보전지위 평가

정재민 ( Jae Min Chung ),이수광 ( Su Gwang Lee ),김성식 ( Sung Sik Kim ),우수영 ( Su Young Woo ),강호덕 ( Ho Duck Kang ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.3

To obtain biological basic data for the conservation strategies establishment of a rare mistletoe species,Loranthus tanakae(Loranthaceae) in Korea, the distribution range, habitat characteristics and an assessment of the conservation status on the natural populations of L. tanakae were investigated. As a result, the natural populations of L. tanakae were distributed in Bakdudaegan from Mt. Chiri to Mt Seorak in Korea penninsula, and 97.8% of surveyed individuals of the mistletoe species were found in Gangwon province. In natural populations, 1,385individuals of L. tanakae were parasitic on 480 host trees, and distributed in sunshiny ridges of mountains of altitude range of 353 m to 1,250 m. The range of host trees of L. tanakae were composed of 5 families, 6genera, 9 species, 1 subspecies, and of these, Quercus mongolica was preferred with 81.5% (389 trees among 480 host trees). As a result of assessing the conservation status through IUCN, L. tanakae was evaluated as Vulnerable (VU). It was considered that Mt. Seorak, Mt. Taegi and Mt. Odae population as habitats with the highest density of distribution of natural populations of L. tanakae should be designated as the protected areas. Thus, conservation strategies and related methods of the natural populations of L. tanakae were also discussed for the sustainable conservation.

Ficção Autobiográfica e Autobiografia Ficcional

정재민(Jae Min Chung) 부산외국어대학교 중남미지역원 2006 이베로아메리카 Vol.8 No.1

자갈, 전석이 포함된 복합지반에서의 DSM공법 시공사례

정재민(Jae-Min Chung),고병우(Byung-Woo Ko),이찬우(Chan-Woo Lee),김영욱 대한토목학회 2013 대한토목학회지 Vol.61 No.1

지리산 구상나무임분의 식생구조와 치수 발생 및 생육 동태

정재민(Jae Min Chung),이수원(Soo Won Lee),이강영(Kang Young Lee) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.1

We investigated the vegetation structure, and effects of canopy degree(gap or purlieu to 25%, 50%, 75%, over 75%) of the overstory on seedling regeneration and survivorship, and sapling density, growth and growth type of Abies koreana in subalpine of Mt. Chiri. The stem density in Abies koreana stand was higher in middle story than upper story, individual trees in upper story occupied larger area and were more apart, resulted in uniform distribution. The regeneration and survivorship of seedlings and saplings were best in 25% of crown closure, in order of 50%, gap, but lowest in over 75% of crown closure. The annual growth rate and recent 5 years growth rate of saplings were highest in gap or purlieu and getting lower toward gradually higher coverage of overstory. And 10- to 20-Year-old saplings were mainly regenerated in stands with lower density( I or II), but most of 20 to 30 years old saplings were growing in stands with higher density (III or N). The number of $quot;A$quot; type saplings grown normally in gap or purlieu was gradually decreased in stand with higher density but the number of $quot;D$quot; or $quot;E$quot; types of which growth was supressed or prohibited by the high density was abruptly increased. Saplings normally growing in the gap and purlieu showed the panicle type, but those grown under dense crown were greatly suppressed and showed the umbellate type.