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구강악안면 영역에서 BONE SPECT의 진단학적 가치 : 증례 보고
윤흥식(Hong Sik Yun),진병로(Byung Rho Chin),이희경(Hee Kyung Lee),박진호(Jin Ho Park) 대한구강악안면외과학회 1997 대한구강악안면외과학회지 Vol.23 No.4
Single photon emission computed tomographic(SPECT) imaging, performed at oral and maxillofacial surgery department, is valuable in assessing temporomandibular dysfunction, looking for metastases in patients with malignancies, diagnosing facial asymmetry. Conventional planar scintigraphy is limited by two-dimensional representation of three-dimensional structures. The SPECT exam, by sectioning through a distribution of tracer, eliminates the obscuring effects of tracer located outside the plane of interest. In our department, we used this image for four type cases retrospectively. 1. Those patients who have facial asymmetry 2. To find metastases in patients with malignacies 3. In combination with magnetic resonance imagine, to confirm the diagnosis of internal joint derangement 4. To evaluate the viability of grafted bone. Recently, this image is able to be used in those patients whose symptoms etiology cannot be explained by other diagnostic techniques.
이종규(Jong-kue Lee),윤흥식(Heung-Sik Yoon) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The main purpose of this study is to develop current fed power supply for LED lighting that is controlled depending on control of current. LED is a device with a little variation of load when its operation is normal. For this study, a structure of current fed circuit for the LED power supply is proposed with the consideration of electric features of LED. IGBT, a switching device is used to generate constant current with control of on-off. In addition, the use IGBT was helpful to reduce switching loss as well as to simplify the circuits. For the experiment, a current fed power supply is designed and tested its characteristics of control of current under the condition of four 96W LED in parallel connection. As a result, its control of current is identified under this experimental circumstance.