정신병과 치매로 발현한 양측 내경동맥 폐색증 환자 1예

전상범,권순억,이상암,이재홍 대한치매학회 2003 Dementia and Neurocognitive Disorders Vol.2 No.2

Bilateral internal carotid artery (ICA) occlusion is a rare cerebrovascular disease. Chronic ICA occlusion is not always associated with neurological deficits, but it can lead to visual disturbance, TIA, non-fatal stroke, and catastrophic stroke presenting with coma A 60-year-old man with bilateral ICA occlusion who presented with psychosis and dementia followed by sudden loss of consciousness is described. His clinical history and MRI findings suggested vascular dementia, but his psychotic features were difficult to explain without bilateral ICA occlusion F^(18)-FDG PET findings mimicked typical Alzhermer's disease and caused diagnostic confusion. To our knowledge, this is the first reported case of bilateral ICA occlusion associated with psychosis and dementia

기능현 전치부 반대교합자의 ACTIVATOR 치료 효과에 관한 임상적 고찰

성재현,전준영,서혜경 慶北大學校 齒科大學 1987 慶北齒大論文集 Vol.4 No.1

The authors treated eight mixed dentiton patients with functional anterior cross-bite by using activator. The lateral roentgenographic cephalograms were analyzed before and after treatment, and skeletal and dental changes following the activator therapy were evaluated. The results were as follows: 1. The mandible was rotated backward and downward. 2. There were labioversion of upper incisors and slight linguoversion of lower incisors. 3. There was little effect of treatment upon maxillary skeletal structures. 4. LFH was increased slightly and soft tissue profile was improved.

밀집치열인의 두개안면골의 형태학적 특성

전준영,성재현 대한치과교정학회 1988 대한치과교정학회지 Vol.18 No.2

The purpose of this study was to investigate the characteristics of craniofacial morphology in adult with crowded dentition. The craniofacial morphology associated with normal and crowded of mandibular dentition was studied in lateral cephalometric radiograph obtained from 145 subjects grouped 44 males and 40 females in normal group, 33 males and 28 females in crowded group. The conclusions were as follows: Means, standard deviations and facial polygons from measurements were obtained from normal and crowded groups. Palatal plane to SN, occlusal plans to SN, mandibular plane to SN, mandibular plane to palatal plane and gonial angle measurements of crowded group were significantly different from normal group and were larger than normal group. SNA, SNB measurements of crowded group were significantly different from normal group and were smaller than normal group. Significant differences were observed between normal group and crowded groups on the basis of SN/1, PP/1, MP/1, and compared with normal group, upper incisors of crowded group were inclined more labially, whereas lower incisors of crowded group were inclined more lingually. Posterior facial height and ramal height were shorter in males of crowded group than those of normal group. Posterior facial height, mandibular length and posterior cranial base length were shorter in females of crowded group than those of normal group. Anterior facial height was longer in females of crowded group than those of normal group.

Blind Interference Suppression for DS-CDMA Systems Based on Widely Linear Kalman Filtering

JaeㅡJin Jeon,Jun-Seok Lim,Sang-Wook Lee,Koeng-Mo Sung 대한전자공학회 2005 ITC-CSCC :International Technical Conference on Ci Vol.2005 No.4

성별, 연령 및 생리주기에 따른 대장 통과시간의 변이

이상전,이두한,송영진,최재운,장이찬 대한대장항문학회 1995 Annals of Coloproctolgy Vol.11 No.1

분쇄 폐타이어를 이용한 크롬의 흡착에 관한 연구

전병렬,이재복,임성진 慶星大學校 環境問題硏究所 1996 環境硏報 Vol.6 No.1

Handling of waste tire rubber is an environmental problem because the number of automobiles is increasing every year. The reuse of waste tire rubber as adsorption material may be a measure to solve this solid waste problem. The adsorption capacity of waste tire rubber was investigated in this study. Operation factors of adsorption such as temperature, pH, solution concentration, and the adsorption capacity were experimentally evaluated to analyze the applicability of waste tire rubber as adsorption material. The waste tire used in the experiment was obtained from an ordinary passenger vehicle. It was washed, dried and cut into pieces with the diameter of about 0.5 mm. to estimate the adsorption capacity, waste tire pieces were put into an erlenmeyer flask containing the hexavalent chromium solution. The atomic absorption spectrophotometry was conducted with the time interval. During the adsorption test, the sample was stirred at the speed of 30-60 rpm. The results showed that equilibrium adsorption capacity was 335 ㎍ Cr??/g of tire when the operation was in the condition of 20ppm chromium solution at pH 1, the temperature of 30℃, and 2g of tire as adsorption material. The value of pH was the most critical factor in adsorption. The extracted zinc ion was detected. This might come out from ZnO which was used in factory as the vula\canization activator of the rubber. The simulation through the isothermic equation resulted in positive applicability for the adsorption of chromium by shredded waste tire rubber.

저압 MOCVD법에 의한 (100)-GaAs 기판 위의 Ga_xIn(1-x)P 성장과 특성

전성란,손성진,조금재,박순규,김영기 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

x??0.51인 Ga_xIn_(1-x)P 에피층을 저압 MOCVD 성장법으로 TEGa(triethylgallium), TMIn(trimethylindium) 등의 MO(metalorganic) 원료와 PH_3(phosphine)를 사용하여 GaAs(100) 기판 위에 성장하였다. 성장조건에 의한 표면 morphology, 결정결함, 성분비, PL spectra, 운반자 농도와 이동도 및 DLTS spectra와 같은 성장층의 특성을 관찰하였다. 650℃의 성장온도와 V/Ⅲ 비, 즉 TEGa와 TMIn 두 원료의 유량에 대한 PH_3의 유량비가 160∼220일 때 가장 좋은 성장표면을 나타내었다. 성장률은 PH_3의 유량변화에 아무런 영향을 받지 않음을 알 수 있었다. Ga_0.51In_0.49P 에피층과 기판의 격자상수 차에 의한 격자 부정합 Δa_⊥/a_0은 약 (3.7∼8.9)×10 exp (-4)이었으며 실온과 5K에서 에피층의 PL 피크 에너지는 각각 1.85 eV와 1.9 eV였다. 성장층의 운반자 농도와 이동도는 V/Ⅲ 비에 따라 달라지는데 그 비가 120에서 220으로 증가함에 따라 농도는 1.8×10 exp (16) ㎝^-3에서 8.2×10 exp (16) ㎝^-3로 증가하였고 이동도는 1010 ㎝/V·sec에서 366 ㎝/V·sec로 감소하였다. Epitaxial layers of Ga_xIn_(1-x)P with x??0.51 were grown on the GaAs substrates oriented 2℃ off (100) toward <110> by low pressure MOCVD growth technique using triethylgallium (TEGa), trimethylindium (TMIn) and phosphine (PH_3). Surface morphology, crystal defects, composition, photoluminescence spectra, carrier concentration and DLTS spectra of the grown layers were investigated. Good quality epilayers with featureless surface were obtained at growth temperature of 650℃ and V/Ⅲ ratio, i.e., PH_3 flow rate divided by the sum of TEGa and TMIn flow rates, of 160 to 220. The growth rate turned out to have no dependence on phosphine flow rate. The lattice mismatchs Δa_⊥/a_0 between grown Ga_0.51In_0.49P epilayer and GaAs substrate were (3.7∼8.9)×10 exp (-4) and the PL peak energies of the epitaxial layer at room temperature and 5K were 1.85 eV and 1.9 eV, respectively. With increasing V/Ⅲ ratio i.e., phosphine flow rate, from 120 to 220, the carrier density and mobility of undoped epitaxial layers increased from 1.8×10 exp (16) to 8.2×10 exp (16) ㎝^-3 and decreased from 1010 to 366 ㎝/V·sec, respectively.

관상동맥질환자에서 경흉부 도플러 심초음파를 이용한 좌심실 확장기 기능의 평가 : 좌심실 확장기 장애 형태에 따른 분류

전희경,윤호중,유기동,박지원,전두수,정욱성,채장성,김재형,최규보,홍순조 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.1

Flowable composite resin을 이용한 접착식 유지장치의 결합강도와 파절양상에 열순환이 미치는 영향

전재호,손우성 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.4

이 연구는 flowable composite resin을 이용한 접착식 유지장치를 열순환시킨 후 결합강도와 파절양상을 조사하여 flowable composite resin이 접착식 유지장치의 레진 접착제로서 유용한지를 알아보기 위해 시행되었다. 교정치료를 목적으로 발거한 160개의 치아로 80개의 시편을 제작하고 40개씩 두 군으로 나누어 접착식 유지장치를 제작하였다(Group G: 일반 복합레진인 CharmFil, Group F: flowable composite resin인 CharmFil Flow, wire: Tri-flex). 각 군을 20 개씩 2 개의 subgroup으로 나누었다(Subgroup 24: 생리식염수에 24시간 동안 보관, Subgroup T : 37℃ 생리식염수에 24 시간 동안 보관한 후 5 ± 2℃ ~55± 2℃ 수조에 500회 열순환). 유지장치의 wire 중점에 수직전단력을 주면서 파절되는 순간의 하중을 측정하여 비교하였으며, 광학입체 현미경으로 파절면을 관찰하여 파절양상을 비교하였다. 그 결과, 두 군의 전단결합강도 및 파절양상에는 통계학적으로 유의한 차이가 없었다. 따라서, 전달결합강도와 파절양상의 측면에서만 본다면 flowable composite resin을 유지장치의 레진 접착제로 충분히 적용시킬 수 있을 것으로 본다. The purpose of this study was to evaluate the effects of thermocycling on shear bond strength and mode of failure of orthodontic bonded retainer using flowable composite resin and to ascertain whether the flowable composite resin is useful for use as adhesive for orthodontic bonded retainers. One hundred and sixty freshly extracted human premolars were collected and eighty bonded retainer specimens were fabricated. They were randomly separated into 2 groups (Group G: general composite resin-CharmFil, Group F: flowable composite resin-CharmFil Flow, wire: Tri-flex). Each group was divided into 2 subgroups (Subgroup 24: stored in water at 37℃ for 24 hours for baseline data, Subgroup T: stored in water at 37℃ for 24 hours and thermocycled between 5 ± 2℃ and 55± 2℃ for 500 cycles before testing the in vitro shear bond strength). Shear bond strength was measured and mode of failure was evaluated with a stereomicroscope. There was no statistical difference in shear bond strength and mode of failure between the bonded retainer using general composite resin and flowable composite resin. Therefore, in considering shear bond strength and mode of failure, it is sufficient to use flowable composite resin as resin adhesives for bonded retainers.

치주인대 세포의 교원질 생성에 대한 Substance P의 효과

전준영,최제용,경희문,성재현 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.1

Substance P는 교정력이 가해진 치아의 치주인대 중 인장력을 받는 부위에 많이 분포하는 neuropeptide 중의 하나이며, 또한 여러 조직에서 neurogenic inflammation을 야기하는 neuropeptide 중의 하나로도 알려져 있다. 그러나 중요한 세포의 단백기질인 교원질의 생성에 대한 Substance P의 효과는 잘 알려져 있지 않다. 따라서 이 연구의 목적은 배양 치주인대 세포에서 교원질 생성에 대한 Substance P의 효과를 평가하는 것이었다. collagenase-digestion method로 교원질 생성을 평가하였고 mRNA 수준에서 작용효과를 평가하기 위하여 Northern blot hybridization을 시행하였다. 이 연구는 또한 교원질 생성에 대한 prostaglandin과 gelatinase 생성도 포함하였으며 변성된 교원질의 분해를 평가하기 위하여 Zymography를 이용하였다. 비교원성 단백질, 교원성 단백질, 상대교원질에 대한 dose-dependent effect를 보면 Substance P는 비교원성 단백질 합성을 증가시켰으나 교원성 단백질 합성은 감소시켰다. 그리하여 총 단백합성에 대한 상대적인 교원질 생성을 나타내는 상대교원질은 7%에서 3.6%로 감소시켰다. 세포를 indomethacin과 동시에 처리할 때 substance P의 교원질 합성 억제효과는 나타나지 않았다. 이것은 Substance P의 교원질 합성 억제효과가 prostaglandin의 생성 때문이라는 것을 의미한다. Substance P의 교원질 합성 억제효과가 procollagen mRNA의 정상(steady-state)수준에 부합하는가를 평가하기 위하여 northern blot hybridization을 시행한 결과 Substance P는 α1(1) procollagen mRNA의 양적 변동을 일으키지 않았다. Substance P의 교원질 생성 억제효과는 전사이후의 어떤 단계에서 이루어지는 현상임을 나타낸다. 치주인대세포에서 gelatinase 생성에 대한 Substance P의 효과를 알아보기 위하여 zymography를 이용하였다. zymogram을 보면 Substance P는 치주인대세포에서 gelatinase 생성에는 아무 효과도 나타내지 않음을 알 수 있다. Substance P의 교원질 생성 억제효과가 치주인대세포에 대해 선택적인가 아닌가를 알아보기 위하여 MC3T3-E1세포를 이용하였는데 Substance P는 MC3T3-E1세포의 교원질 합성에는 영향을 미치지 않았다. 이상에서 Substance P는 인간의 치주인대세포에서 교원질 합성을 억제하였다. 이 효과는 procollagen mRNA와 gelatinase 생성의 정상(steady-state) 수준의 변화 때문이 아니라 prostaglandin 생성과 연관이 있음을 알았다. Substance P is one of the neuropeptide which presents highly in tension site of periodontal ligament during the orthodontic tooth movement. It has been also known as one of the neuropeptides which cause neurogenic inflammation in various tissues and organs. However, there is no report about the effect of substance P on major extracellualar matrix protein, collagen production. The purpose of this study was to evaluate the collagen production by substance P in human periodontal ligament cell, The collagenase-digestion method was used to evaluate collagen production and also used Northern blot hybridization for the evaluation of collagen mRNA level. This study also included in terms of prostanglandins and gelatinase production with respect to collagen production. For the collagen degradation, zymography was used to estimate denatured collagen degradation. Dose-dependent effect of substance P on noncollagen protein, collagen, and percent collagen was that substance P increased noncollagen protein synthesis, but decreased collagen systnisis. So the percent collagen, which determined by relative collagen production against total protein production, was decreased from 7% to 3.6%. This inhibitory effect of substance P on collagen production was disappeared when cells were treated concomitantly with indomethacin. It means that substance P-induced inhibitory effect on collagen production was due at least in part to the production of prostaglandins. To evaluate whether substance P-induced inhibitory effect on collagen production is correspond to the steady-state levels of procollagen mRNA, Northern blot hybridizartion was performed and it showed that substance P has no effect on the steady-state level of α1(1) procollagen mRNA. It means that the inhibitory effect of substance P on collagen production was due to the change of a certain mechanism after posttranscription. In this context, gelatinase production by substance P in periodontal ligament cells was evaluated by zymography. Zymogram showed that substance P has no effect on gelatinase production in periodontal ligament cells. To explore wheter substance P-induced inhibitory effect on collagen production is selevtive in periodontal ligament cells or not, MC3T3-31 cells which originated from mouse calvaria was used. It showed that substance P has no effect on collagen production in MCDTD-E1 cells. Taken together, substance P inhibits collagen production in human periodontal ligament cells. This effect was not due to the change of the steady-state level of procollagen mRNA and gelatinase production, but due at least in part to the change of prostaglandins production.