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나선형 단층방사선사진촬영에서 촬영조건이 악골 단면상의 높이, 폭 및 인지도에 미치는 영향
이태완,한원정,김은경,Lee Tae-Wan,Han Won-Jeong,Kim Eun-Kyung 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.1
Purpose : To evaluate the differences in bone height, bone width, and visibility of posterior spiral tomographic images according to various exposure directions, image layer thickness, and inclination of the mandibular inferior border. Materials and Methods: Six partially and completely edentulous dry mandibles were radiographed using Scanora spiral tomography. Spiral tomography was performed at different exposure directions (dentotangential and maxillotangential projection), image layer thicknesses (2 mm, 4 mm and 8 mm), and at various inclinations to the mandibular border (+ 100, 00 and -10°). The bone height and width was measured using selected tomographic images. The visibility of mandibular canal, crestal bone, and buccal and lingual surfaces were graded as 0, 1, or 2. Results : The bone width at the maxillo-tangential projection was wider than at the dento-tangential projection (p < 0.05). The visibility of buccal and lingual surface at the maxillo-tangential projection was higher than at the dento-tangential projection (p<0.05). Thinner image layer thicknesses resulted in greater visibility of buccal and lingual surfaces (p < 0.05). Bone height was greatest in the -10° group, and at the same time the bone width of the same group was the narrowest (p < 0.05). The visibility of alveolar crest and buccal surface of the + 10° group was the highest, while the visibility of the mandibular canal was greatest in the 00 group. Conclusion: When spiral tomography is performed at the mandibular posterior portion for visualization prior to implant surgery, it is important that the inferior border of mandible be positioned as parallel as possible to the floor. A greater improvement of visibility can be achieved by maintaining a thin image layer thickness when performing spiral tomography.
측두하악관절의 초음파영상과 자기공명영상에서 하악과두 외측면과 관절낭간 거리 측정치 비교
이태완,유동수,한원정,김은경,Lee Tae-Wan,Yoo Dong-Soo,Han Won-Jeong,Kim Eun-Kyung 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Purpose : To evaluate the reliability and clinical usefulness of ultrasonography in the temporomandibular joint (TMJ). Materials and Methods : Parasagittal and paracoronal 1.5 T MR images and 7.5 MHz ultrasonographs of 40 TMJs in 20 asymptomatic volunteers were obtained. Disc position using MR imaging was evaluated and the distance between the lateral surface of mandibular condyle and the articular capsule using MR image and ultrasonograph of 27 TMJs with normal disc position was measured and compared. Intraobserver and interobserver measurements reliability was evaluated by using interclass correlation coefficients (ICC) and measurement error. Also, the distance measured on ultrasonographs was compared, according to mouth position and disc postion. Results : The normal disc position was found in 27 of 40 asymptomatic joints. At the intraobserver reliability of measurement, ICC at the closed and open mouth position were 0.89 and 0.91. The measurement error was 0.4% and 0.5%. At the interobserver reliability, ICC at the closed and open mouth position were 0.92 and 0.81. The measurement error was 0.4% and 0.7%. At the TMJ with normal disc position, the distances between the lateral surface of mandibular condyle and the articular capsule measured on MR images and ultrasonographs were $2.0{\pm}0.7mm,\;1.8{\pm}0.5mm$, respectively (p<0.05). On the ultrasonographs, the distances at open mouth position were $1.2{\pm}0.5mm$ (p<0.05). At the TMJ with medially displaced disc, the distances at the closed and open mouth position were $1.3{\pm}0.3\;mm\;and\;0.9{\pm}0.2\;mm$ (p<0.05). Conclusion : The results suggest ultrasonography of TMJ is a reliable imaging technique for assessment of normal disc position.
부모의 과보호와 아동의 행동억제기질이 아동기 수행불안에 미치는 영향: 정서조절곤란의 매개효과를 중심으로
이태완 ( Lee Tae Wan ),이지연 ( Lee Jee Yon ),김은석 ( Kim Eun Seok ) 충남대학교 교육연구소 2018 교육연구논총 Vol.39 No.4
본 연구의 목적은 아동기 수행불안에 영향을 미치는 부모의 과보호, 아동의 행동억제기질과 정서조절곤란의 구조적 관계를 확인하는 것이다. 이를 위해 서울, 인천 및 경기 지역에 소재한 초등학교에 재학 중인 5, 6학년 학생 563명을 대상으로 설문조사를 실시하였으며, 이 중에서 불성실한 응답이 있는 32부를 제외한 531부의 설문지가 분석에 사용되었다. 구조방정식 모형을 사용한 분석 결과, 부모의 과보호와 아동의 행동억제기질은 수행불안의 유의한 예측 변수임이 확인되었다. 또한, 정서조절곤란은 부모의 과보호와 수행불안 간의 관계를 부분매개 하는 반면, 아동의 행동억제기질과 수행불안 간의 관계를 완전매개 하는 것으로 나타나 서로 다른 정서적 경로가 존재함을 드러냈다. 연구 결과를 통해 아동기 수행불안에 효과적으로 개입하기 위해 위험군을 사전 선별할 때 고려해야 할 요소들이 무엇인지 확인하였으며, 부모의 과보호가 야기하는 수행불안과 아동의 행동억제기질에 의해 유발된 수행불안에 대한 서로 다른 개입 전략에 대해 논의하였다. This study aimed to investigate the structural relationship between parental overprotection and behavioral inhibition in children, difficulties in emotion regulation, and performance anxiety during childhood. For this purpose, 563 students in grades 5 and 6 in elementary schools in Seoul, Incheon, and Gyeonggi provinces were surveyed. Of these, except for 32 incomplete responses, 531 questionnaires were used in an analysis. The results of the analysis using a structural equation model showed that, parental overprotection and behavioral inhibition in children were found to be predictors of performance anxiety. Difficulties in emotion regulation partially mediated the relationship between parental overprotection and performance anxiety of children, whereas it was found to completely mediate the relationship between behavioral inhibition in children and performance anxiety. The results of this study confirmed what factors should be considered when preselecting risk groups in order to effectively intervene in childhood performance anxiety. In addition, we discussed different intervention strategies for performance anxiety caused by parental overprotection and performance anxiety caused by behavioral inhibition in children.
전산화단층촬영을 시행받는 응급환자에서 조영제 유도 신독성 예방을 위한 저용량 아세틸시스테인 정맥투여
이태완 ( Tae Wan Lee ),김지훈 ( Ji-Hoon Kim ),최승필 ( Seung Pil Choi ) 대한임상독성학회 2017 대한임상독성학회지 Vol.15 No.2
Purpose: To evaluate the effects of low-dose intravenous N-acetylcysteine on the prevention of contrast-induced nephropathy (CIN) in patients undergoing computed tomography (CT). Methods: All patients presenting to our emergency department and undergoing CT with intravenous contrast media between August 2014 and April 2016 were retrospectively enrolled. We included hospitalized patients with renal dysfunction [estimated glomerular filtration rate (GFR) between 30 and 89 mL/min/1.73 ㎡]. A 600-mg injection of Nacetylcysteine was given to patients once before and once immediately after CT, depending on the preference of physician. The primary outcome was CIN defined as an increase in creatinine level of ≥25% or ≥0.5 mg/dL from the baseline within 48 to 72 hours after CT. A trained person blindly reviewed all medical records. Results: Of the 1903 admitted patients, CIN occurred in 9.8% of patients who received 1200 mg intravenous Nacetylcysteine (24/244) and 6.8% of patients who did not (113/1659, p=0.090). In a multivariable regression analysis, N-acetylcystine was not relevant to the prevention of CIN (odds ratio=1.42 [95% CI, 0.90-2.26]). Even in the stratified analysis using the propensity score matching, N-acetylcysteine was irrelevant (GFR 30-59: odds ratio=1.06 [95% CI, 0.43-2.60]; GFR 60-89: odds ratio=1.76 [95% CI, 0.75-4.14]). After adjustment, crystalloids were significantly associated with the reduction in CIN compared with dextrose water (odds ratio=0.60 [95% CI, 0.37-0.97]). Conclusion: No effect was found when low-dose intravenous N-acetylcysteine was used to prevent CIN. However, there seems to be an association between crystalloids and reduction in CIN.
이태완 ( Tae Wan Lee ),강길선 ( Gil Son Khang ),황성주 ( Sung Joo Hwang ),이한구 ( Han Koo Lee ) 한국조직공학·재생의학회 2007 조직공학과 재생의학 Vol.4 No.1
Hydrogel dressings of the three dimensional structure containing chitosans and moisturizers were prepared as the treatment of wound. In this study, swelling ratio were compared hydrogel dressings with polyurethane foam dressing to predict the absorptivity of an exudate, and wound healing effect were estimated for 5 weeks by 3 days after inducing the wound on the back of the micro-pig. The swelling ratios of hydrogel dressings and polyurethane foam dressing were indicated 6.04±0.33 and 5.77±0.25, respectively. Also, the wound healing effects of hydrogel dressings and polyurethane foam dressing were measured 7.79±1.48% and 8.22±3.33%. The wound healing effects of hydrogel dressings and polyurethane foam dressing were showed a lot of similarity, Thus, the hydrogel dressings in this study would be pharmaceutically applicable for the wound healing.
성장정지효과에 의한 InGaAs / InP 양자우물구조의 Photoluminescence 특성 변화
문영부(Youngboo Moon),이태완(Tae-Wan Lee),김대연(Daeyeon Kim),윤의준(Euijoon Yoon),유지범(Ji-Beom Yoo) 한국진공학회(ASCT) 1998 Applied Science and Convergence Technology Vol.7 No.2
저압 MOCVD 방법을 이용하여 InGaAs/InP 양자우물구조를 성장하였다. 성장 정지 시간에 따른 photoluminescence 특성의 변화를 통하여 계면구조를 분석하였다. InP 표면을 PH₃ 분위기로, InGaAs 표면을 AsH₃분위기로 유지하며 성장을 정지하는 경우에는 성장 정지 시간이 길어짐에 따라 불순물 유입에 의한 것으로 생각되는 PL 반가폭의 증가를 관찰하였다. InP 표면에 AsH₃을 공급하는 경우에는 As-P 교환에 의해 우물층 두께가 증가하여 PL 피크가 저에너지로 이동하였고, 반가폭의 변화는 크지 않았다. 계면 양자우물구조를 형성하여 As-P 교환작용에 대해 조사하였고, 1-2 monolayer가 InAs 유효두께로 계산되었다. InGaAs 표면에 PH₃을 공급한 결과, PL 피크가 고에너지로 이동하는 것을 관찰하였고 동시에 반가폭도 증가하였다. 이는 메모리 효과에 의해 InP 층으로의 As 침투를 억제하고, InGaAs 표면에서의 국부적인 As-P 교환에 의한 것으로 생각된다. The InGaAs/InP quantum wells (QWs) were grown by low pressure metalorganic chemical vapor deposition and the effects of growth interruption steps on their interfacial structures were investigated by measuring photoluminescence spectra. When InP or InGaAs surface was treated under the same group V ambient, the full width at half maximum (FWHM) of the QW peak increased possibly due to the incorporation of impurities during the growth interruption time. When InP surface was treated under AsH₃, however, the PL peak showed red-shift due to the As-P exchange reaction and the change of FWHM was not remarkable. The effective thickness of InAs interfacial layer formed during AsH₃ treatment on the InP surface was calculated to be 1~2 monolayers. In the case of InGaAs treatment under PH₃ the PL peak energy and the FWHM increased. This results suggest that PH₃ treatment on the InGaAs surface suppresses the incorporation of As into the subsequent InP layer and the local replacement of As by P occurs simultaneously.