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김태민,김서경,황인남,황윤찬,강병철,윤숙자,이재서,오원만 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.1
This study was performed to assess the radiopacity of a variety of root canal sealers according to the Specification concerning root canal sealers. Ten materials including Tubli-Seal™, Kerr Pulp Canal Sealer™, AH 26^(R), AH plus^(R), AH plus jet™, Ad seal™, Sealapex™, NOGENOU™, ZOB seal™, Epiphany™, and dentin were evaluated in this study. In the first part. densitometric reading of an each step of aluminum step wedge on occlusal film was performed at different voltage and exposure time. In the second part, ten specimens were radiographed simultaneously with an aluminum step wedges on the occlusal films under decided condition. The mean radiographic density values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al). The following results were obtained 1 Among the various conditions, the appropriate voltage and exposure time that meet the requirement density was 60 kVp at 0.2 s 2 All of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards. 3 The radiopacity of materials increased as thickness of materials increased. 4 The mm Al value of each specimen at 1mm in thickness has a significant difference in the statistics. It suggests that root canal sealers have a sufficient radiopacity that meet the requirement. 다양한 근관전색제는 방사선 사진상 주위 해부학적 구조와 구별될 만한 방사선 불투과성을 나타내야 한다 따라서 이런 물질들이 근관에 충전될 때의 방사선 불투과성 정도를 평가해야 할 필요성이 대두되고 있다. 본 실험에서는 다양한 근관전색제들의 방사선 불투과성을 평가하고자, 방사선 노출조건에 따른 aluminium step wedge에 대한 광학 밀도를 알아보고, 그 중 적절한 노출조건을 선택하여 수종의 근관 전색재의 방사선 불투과성 정도를 알루미늄 두께로 환산하여 비교해 보고자 한다. 방사선 불투과성의 기준을 위해 11개의 step으로 구성된 aluminum step wedge을 사용하여, 60kVP, 70kVp관전압 상태에서 각각 0.2, 0.3, 0.4초 그리고 0.2, 0.3, 0.33초의 꼭 노출시간으로 교합필름상에서 방사선 촬영후 적절한 노출 조건을 구하였다. 직경 5mm 각각의 두께 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 mm인 10종 (Tubli-Seal™, Kerr pulp Canal Sealer™, AH26^(R), AHplus^(R), AH plus jet starter kit™, Ad seal™, Sealapex™, Nogenol root canal sealer™, ZOB seal™, Epiphany™)의 근관전색재 시편을 각 재료와 두께당 10개씩 제작한 후, 동일한 두께의 상아질 시편, aluminum step wedge와 함께 정해진 노출시간에 따라 방사선 촬영을 하였다. 모든 필름은 자동현상기로 현상하였다. 시편의 방사선 흑화도를 densitometer로 5회 반복 측정 후, 평균값을 구하여 알루미눔 두께로 환산하였다.얻어진 정보를 분석하여 다음의 결과를 얻었다. 1 관전압 60 kVp에서 노출시간 0.2, 0.3, 0.4초, 70 kVp에서 0.2, 0.3, 0.33초로 변화를 주어 방사선 촬영을 하였을 때 흑화도가 ISO No. 6876 규격에 가장 적합한 것은 60 kVP, 0.2초 일 경우였다. 2 측정된 근관 전색제의 방사선 불투과성은 2.29 mm Al (N0GEN0L)로부터 13.69 mm Al (AH Plus jet)까지 다양하게 나타났으나, 모두 ANSI/ADA specification (2000) 또는 ISO No. 6876 (2001) 규격이 제시한 최소한 3mm Al 이상의 방사선 불투과성을 지녀야 한다는 기준에 적합하였다. 3 재료의 두께가 증가할수록 방사선 불투과성은 증가하지만, 정비례하지는 않았다. 4 각 실험재료의 1 mm 두께의 시편에 대한 mm Al값들은 통계적으로 유의한 차이가 있었다. 이상의 결과는 본 실험에 사용된 수종의 근관 전색재는 모든 규격에 적합한 방사선 불투과성을 가지고 있음을 시사한다.
발포폴리스티렌비드를 사용한 경량골재 콘크리트의 패널적용을 위한 실험적 연구
사순헌,이종찬,지석원,정광량,서치호 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Because lightweight concrete with expanded polystyrene beads has properties of low density, low heat conductivity, it can be used in lightweight structural material and heat insulation layer. But application of this material in buildings is insufficient yet. One of application in building is panel, like non-structural partition used inside, has low compressive strength. So the purpose of this study is to lead the fundamental data to improve low strength of lightweight concrete with polystyrene beads by mixing silica fume and curing methods for application to dry lightweight panel of building, which is based on the mechanical property of lightweight concrete using polystyrene beads, and to examine suitability of polystyrene beads as composition material of panel from the above result. Unit volume weight of fresh concrete is 0.5-0.61t/m³ in EPSB substitution rate 70% and 0.27 -0.33t/m³ in EPSB substitution rate 80%, and compressive strength as increase of silica fume substitution rate is increased but, batch in EPSB substitution rate 80% has low compressive strength rate. Compressive strength by curing method was higher by high temperature(60˚C, seal up).
유현아,김은영,서민지,정은,조민정,오현진,장지혜,박지찬,이정의,박석영 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.2
Gastric metastasis from breast cancer is rare and only six cases have been reported in Korea. Colon metastasis is more rare than gastric metastasis. We report a 63-year-old woman with gastric and colon metastases of invasive lobular carcinoma of breast. She was diagnosed as right breast cancer, received right modified radical mastectomy 10 years ago and has been treated with chemotherapy and hormone therapy. Investigating for melena and a small caliber of stool, we found gastric and colon metastases. The diagnosis of metastatic breast cancer was made through gross pathologic and immunohistochemistry staining. We report a case with gastric and colon metastases from breast cancer and a review of the associated six case reports in Korea.
가청수중음에 의한 넙치의 행동에 관한 기초적 연구 : 1.육상수조 양식장내의 환경소음
이유철,이창헌,최찬문,박용석,서두옥 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
A fundamental experiment was carried out to confirm the behaviour of Bastard halibut Paralichthys olivaceus to audible underwater sound in a breeding ground around the coast of Cheju Island. To find characteristics of breeding water tank and experiment water tank. ambient noise, undcrwater noise and feeding sound of fish were measured and analyzied respectively. The results of measurement are as follows: 1. The maximum sound pressure level of ambient noise in breeding water tank was 81dB. average maximum sound level of underwater noise was 81dB at 120Hz. 2. The maximum sound pressure level of ambient noise in experiment water tank was 76dB and underwater noise was 84.2dB at 130Hz. 3. The maximum sound pressure level of feeding sound was 85dB at 120Hz.
이준,변유미,조민근,조주연,원경준,김영대,박찬국,김만우,유재근,서홍주,이석기 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2
구토 후 발생한 토혈을 주소로 내원한 환자에서 좌측 늑막 삼출 동반 시 식도 파열의 가능성을 고려하여 흉수 천자 및 지속적인 흉부 단순 촬영의 추적관찰이 필요하며 식도 파열이 배제된 후 환자의 생체 징후 및 토혈 양을 파악하여 내시경 검사 시기를 신중히 결정하는 것이 좋을 것으로 생각된다. 본 증례는 토혈을 주소로 내원하여 Mallory-Weiss 증후군 의심 하에 내시경을 통한 치료 시행 후 추적 관찰에 의해 진단된 Boerhaave 증후군을 경험하였기에 보고하는 바이다. Boerhaave's syndrome is a spontaneous perforation of the esophagus most commonly resulting from a sudden increase in intraesophageal pressure combined with negative intrathoracic pressure caused by straining or vomiting. Surgery should generally be performed within 24 hours because mortality approached 30 to 50 percent in which surgery was delayed. Therefore, early diagnosis and prompt surgical repair are critical for survival. We have experienced a case of Boerhaave's syndrome in a patient presenting with hematemesis with left pleural effusion without any signs or symptoms of pneumomediastinum or pneumothorax.
서경희,변찬석,전헌선,진흥신,신윤희,최미향 대구대학교 특수교육재활과학연구소 2004 특수교육재활과학연구 Vol.43 No.1
The purpose of this study was to analyze characteristics and needs of the people with disabilities in the facilities. The results of the study were as follows. First, they frequently showed the symptoms of colds, light injuries, headaches, stomachaches, constipations, and liver diseases. Second, it showed that 30% of daily living behaviors could give bad influences on their daily living, health and learning or the people around them. Third, medication was the most important component of the their environment informations. Fourth, their main living environment manners were medication, participation of programs and school activities.
Seo, Sang Woo,Lee, Ha Seung,Shin, Dong Hee,Kim, Ju Hwan,Jang, Chan Wook,Kim, Jong Min,Kim, Sung,Choi, Suk-Ho IOP 2017 Nanotechnology Vol.28 No.42
<P>We first employ highly-stable and -flexible (CF<SUB>3</SUB>SO<SUB>2</SUB>)<SUB>2</SUB>NH-doped graphene (TFSA/GR) and GR-encapsulated TFSA/GR (GR/TFSA/GR) transparent conductive electrodes (TCEs) prepared on polyethylene terephthalate substrates for flexible organic solar cells (OSCs). Compared to conventional indium tin oxide (ITO) TCEs, the TFSA-doped-GR TCEs show higher optical transmittance and larger sheet resistance. The TFSA/GR and GR/TFSA/GR TCEs show work functions of 4.89?±?0.16 and 4.97?±?0.18 eV, respectively, which are not only larger than those of the ITO TCEs but also indicate p-type doping of GR, and are therefore more suitable for anode TCEs of OSCs. In addition, typical GR/TFSA/GR-TCE OSCs are much more mechanically flexible than the ITO-TCE ones with their photovoltaic parameters being similar, as proved by bending tests as functions of cycle and curvature.</P>