http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이원섭,김기석,Lee, Won-Seop,Kim, Ki-Suk Korean Academy of Orofacial Pain and Oral Medicine 2007 Journal of Oral Medicine and Pain Vol.32 No.4
This study was performed to investigate the dental ages of the patients with temporomandibular disorders(TMD), using a method of age estimation by dental attrition, and to compare the differences of dental ages between control and experimental groups. In addition, they were compared according to oral habit. Clinical evaluations for the tooth attrition were to examine the study models of 65 TMD patients (mean age of 26.6 years, aged 18 to 40) had visited to the Department of Oral Medicine and Orofacial Pain Clinic, Dental Hospital, Dankook University as a experimental group and 22 volunteers (mean age of 25.4 years, aged 23 to 36) without TMD as a control group. Age differences were calculated subtracting real age from estimated age. Age differences between experimental and control groups were compared statistically between groups classified according to oral habit. As a results, dental age was increased significantly in TMD patients compared with normal subjects. Oral parafunctions which increased dental age were bruxism, clenching and heavy chewing in order. Conclusively, it should be consider that there can be much discrepancy between real age and age estimated by dental attrition in patients with TMD. In addition, it is suggested that dentists should try to protect the tooth from attrition by various parafunction on treating the patients with TMD.
산처리(酸處理)에 따른 상아질(象牙質)에 대한 Glassionomer Cement의 접착강도(接着强度)에 관(關)한 실험적(實驗的) 연구(硏究)
이원섭,민병순,최호영,박상진,Lee, Won-Seob,Min, Byung-Soon,Choi, Ho-Young,Park, Sang-Jin 대한치과보존학회 1988 Restorative Dentistry & Endodontics Vol.13 No.1
The purpose of this study was to evaluate the bond strength of glassionomer cement against cut dentin surface which was treated with various surface cleaning agents. 48 freshly extracted human 3rd molars were ground flat through the enamel into the dentin using 600 grit silicone carbide paper under a flow of water. The were divided into four groups by the following cleaning procedure on cut dentin surface; Group I : No surface treatment after grinding with 600 grit silicone carbide paper as control group Group II : Surface treatment with 50% citric acid for 30 seconds. Group III : Surface treatment with 37% phosphoric acid for 30 seconds. Group IV : Surface treatment with 10% poly acrylic acid for 30 seconds. The specimens in 4 groups were immersed in distilled water at $37^{\circ}C$ for 24 hours before testing after cleanising with water-spray and drying with air. Bond strength was measured with Instron Universal Testing Machine (Autograph S-100, Shimadzu, Kyoto, JAPAN). The results were as follows: 1. The bond strengths of group II, III & IV were not seemed to be shown more significant improvement than a group I. 2. The bond strengths in groups which were treated with 50% citric acid, 37% phosphoric acid and 10% polycrylic acid, were ranked 24.70kg/$cm^2$, 22.02kg/$cm^2$ and 31.13kg/$cm^2$, but its difference was not significant, statistically.
이원섭,정승원,박양후,조국환,Lee,Won-Sup,Jung,Seung-Won,Park,Yang-Hoo,Cho,Kook-Hwan 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4
The more increase of construction of railways and roads, the more increase of tunneling in Korea. NATM(New Austrian Tunneling Method) is used for most tunneling construction, and excavations by blasting are usually adopted. The most important consideration in blasting excavation is how to minimize damages and overbreaks in the rock, which is brought up interests from many researchers. The damages and overbreaks in the rock directly influence on the stability of the tunnel during construction as well as on maintenance after construction. The dynamic properties of the rock are measured by strain gauges during trial blasting from two different sites. A procedure to evaluate the critical volumetric strain of the rock using measured values during blasting is proposed. Rock damage zone analyses are performed using a FEM analysis program called ABAQUS/Explicit by adopting the evaluated critical volumetric strain. The technique to determine optimum blasting pressure is also proposed using numerical analysis results. 국내에서는 철도 및 도로의 건설이 증가에 비례하여 터널공사가 증가하고 있다. 터널공사의 경우 대부분 NATM 공법에 의한 공사가 진행되고 있으며, 터널의 굴착은 발파에 의한 방법이 주로 사용되고 있다. 발파에 의한 굴착시 가장 중요한 것은 암반손상 및 여굴 최소화이며, 이에 대한 연구의 중요성이 대두되고 있다. 발파 작업시 터널단면 주위에 발생하는 암반의 손상과 여굴은 터널의 안정성에 직접적인 영향을 미칠 뿐만 아니라 완공 후 유지관리에도 큰 영향을 미치게 된다. 본 연구에서는 변형률계를 이용하여 암반의 동적물성치를 2개소의 현장 시험 발파를 통하여 측정하였다. 발파 중 측정된 변형율값으로부터 암반 손상영역의 한계 동적 변형율 산정기법을 제시하였다. 산정된 한계 동적 변형율과 유한요소해석 프로그램인 ABAQUS/Explicit를 이용하여 암반 손상영역 해석을 실시하였으며, 이를 이용하여 최적의 발파압력 산정기법을 제시하였다.
이원섭,최광수,Lee, Won-Seop,Choe, Gwang-Su Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.5
The deep level electron traps in AP-MOCVD GaAs/undoped Al\ulcornerGa\ulcornerAs/n-type GaAs heterostructures have been investigated by means of Deep Level Transient Spectroscopy DLTS). In terms of the experimental procedure, GaAs/undoped Al\ulcornerGa\ulcornerAs/n-type GaAs heterostructures were deposited on 2" undoped semi-insulating GaAs wafers by the AP-MOCVD method at $650^{\circ}C$ with TMGa, AsH3, TMAl, and SiH4 gases. The n-type GaAs conduction layers were doped with Si to the target concentration of about 2$\times$10\ulcornercm\ulcorner. The Al content was targeted to x=0.5 and the thicknesses of Al\ulcornerGa\ulcornerAs layers were targeted from 0 to 40 nm. In order to investigate the electrical characteristics, an array of Schottky diodes was built on the heterostructures by the lift-off process and Al thermal evaporation. Among the key results of this experiment, the deep level electron traps at 0.742~0.777 eV and 0.359~0.680 eV were observed in the heterostructures; however, only a 0.787 eV level was detected in n-type GaAs samples without the Al\ulcornerGa\ulcornerAs overlayer. It may be concluded that the 0.787 eV level is an EL2 level and that the 0.742~0.777 eV levels are related to EL2 and residual oxygen impurities which are usually found in MOCVD GaAs and Al\ulcornerGa\ulcornerAs materials grown at $630~660^{\circ}C$. The 0.359~0.680 eV levels may be due to the defects related with the al-O complex and residual Si impurities which are also usually known to exist in the MOCVD materials. Particularly, as the Si doping concentration in the n-type GaAs layer increased, the electron trap concentrations in the heterostructure materials and the magnitude of the C-V hysteresis in the Schottky diodes also increased, indicating that all are intimately related.ated.
이근석(Keun Seok Lee),이윤종(Yun Jong Lee),이원섭(Won Sup Lee),안진석(Jin Seok Ahn),이종태(Jong Tae Lee),김원석(Wen Seong Kim),허대석(Dae Seog Heo),방영주(Yung Jue Bang),박선양(Seon Yang Park),조광현(kwang Hyun Cho),김병국(Byoung Koo 대한내과학회 1996 대한내과학회지 Vol.51 No.3
N/A Objectives: Sweet`s syndrome(acute febrile neutrophilic dermetosis) is characterized by fever, neutrophilia, erythematous painful cutaneous plaques, a dense dermal infiltrate onsisting of mature neutrophils, and a rapid response to steroid therapy, This condition is clinically important because it is associated with malignancy and it should be one of the differential diagnosis in the febrile immunocompromized patients with skin lesion, In spite of its clinical importance, there was no report on the epidemiologic characteristics of Sweets syndrome in Korean patients so far because of the rarity of Sweet`s syndrome, This study was performed to investigate characteristics and clinical significance of Sweet`s syndrome in Korean patients. Methods : The authors report a case of Sweet`s syndrome associated with acute myelogenous leukemia, and review the other 23 Korean patients with Sweet's syndrome that have been published in the literature. The characteristics of malignancy-associa- ted Sweet`s syndrome are compared with those of Sweet`s syndrome without malignancy association. Results: 1) Twenty-four cases of Sweet`s syndrome were analysed. Male to female ratio was 8:16 and the mean age was 44.8± 11.7 years. In 79% of patients, fever was noticed during the episodes of Sweet's syndrome. The most frequent sites of skin lesions were the upper extremities(83%), followed by face and head(75%), the lower extremities(75%), neck(46%), and trunk (13%). 2) Associated underlying systemic disorders were present in 15(62%) of the patients. The most frequent associations were chronic inflammatory bowel disease in seven patients, hematologic neoplasia in five, and solid neoplasia in one patients. 3) Leukocyte counts(mean 13,400±8,000/mm3) were higher than 10,000/mm3 in 16(67%) of patients. Erythrocyte sedimentation rates(mean 66.8±44.4mm/ hour) were elevated in 18(82%) of patients. 4) Skin lesion improvements were observed within 2 to 5 days from the initiation of steroid therapy. 5) Malignancies were associated in 6 patients. The initial appearance of Sweet`s syndrome lesions preceded or occurred concurrently with the detection of previously unsuspected malignancy in 67%(4 of 6 patients), In malignancy associated Sweet's syndrome, relative male preponderance, older age, and higher leukocyte counts were observed compared with Sweet's syndrome which is not associated with malignancy. There were no statistical significances, however. The erythrocyte sedimentation rate was the only statistically significant parameter. Conclusion: The characteristics of Sweet`s syndrome in Korean patients were similar to the characteristics of their western counterparts. Workup for malignancy seems appropriate far newly diagnosed Sweet`s syndrome patients in case of elevated erythrocyte sedimentation rate, leukocytosis, old age, and male sex
이원섭(Won-Sup Lee),정승원(Seung-Won Jung),조국환(Kook-Hwan Cho) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
최근 삶의 질에 대한 관심이 고조되면서 토양환경에 대한 관심이 대두되고 있다. 특히 2000년대부터 폐광산과 같은 중금속 오염 토양으로 인한 문제가 지속적으로 제기되면서 중금속 오염 토양이 새로운 문제점으로 지적되고 있다. 본 연구에서는 철도 폐선부지의 자갈시료를 채취하여 토양의 오염도를 측정하였다. 실험 방법으로는 ICP/AES 에 의한 중금속 분석(카드뮴, 구리, 납, 아연)과 실내시험을 통하여 부유물질(총인, 총질소, BOD, COD) 유출 특성을 파악해 보았다. 중금속의 경우 1지역에 해당하는 토양오염우려 기준치에 근접하거나 상회하는 결과를 얻었으며, 본 연구를 통해 철도시설지역에서의 비점오염원 관리방안 수립을 위한 기초자료를 마련하고자 한다. The more increase in life quality interesting, the more increases in environmental intesting such as soil contamination as so on. Since 2000s, new issues of soil have been contaminated by heavy metals in abandoned mining area brought out. In this study, balasts and soils were sampled in closed railway area was used ICP/AES method for measuring the amount of heavy metal contamination(Cd, Cu, Pb, Zn) and the flux characteristics of suspended solids(TP, TN, COD, BOD) were also measured in laboratory. Research results show that the amounts of heavy metal contamination are very close or excced to limitation according to 3rd area classification by goverment standard. The research results will contributed the environmental control plan in railway areas.