(A) Study on the Development of a Sunlight Collection System Using a Sensor Array Technique

A Study on the Development of a Sunlight Collection System Using a Sensor Array Technique Nowadays, concerns about the discovery and the development of alternative energies are increased day by day, and naturally researches on the development of alternative energies are reported in every country of the world. Moreover, it is very important to find alternative energies in this country which has little resources. There are many types of energies which belong to alternative energy, such as solar energy, wave energy. wind energy, and so forth. Solar energy is one of the most attractive alternative energies for the future because it is clean, consistently supplied, and widely distributed throughout the earth. Especially, it has high potential to be used in this country which has much better daylights a year. By the way, the density of the solar energy is too low to use the solar energy directly. In order to use it effectively it must be needed to comprise a system to collect the sunlight. To comprise the sunlight collection system, first of all, a solar tracking system is necessary to track the sun during daylighting. This thesis describes a sunlight collection system during daylighting which comprises a solar tracking element, sunlight collection element, and sunlight transmitting element. The most important element of them is the solar tracking element and this thesis proposes a new type solar tracking system which uses a full sensor method with a two-axis sensor array. And it also develops an algorithm which operates the overall system effectively. Especially, an algorithm called holding mode algorithm is developed to reduce the execution time for the real time tracking. The developed system has the characteristic that it is applicable the place where the mounted base is moved or where the orientation is changed with time. Because the suggested solar tracking system tracks the sun only using the two-axis sensor array regardless of the information of the position

골격성 제 III급 부정교합 환자의 양악 수술 후 경조직과 연조직 변화의 3차원 분석

Introduction: This study investigated the correlation between the threedimensional changes in facial soft tissues, including the midfacial parasagittal area and maxillamandible complex, after Le Fort I osteotomy with maxillary posterior impaction and bilateral intraoral vertical ramus osteotomy (B-IVRO), using cone-beam computed tomography (CBCT). Material and Methods: This retrospective study included 22 skeletal Class III patients who underwent orthognathic surgery. Threedimensional CBCT images taken before and 1year after surgery were superimposed based on the cranial base. Midfacial soft tissues, including those in the parasagittal area and midsagittal areas of the face, were evaluated using reconstructed CBCT images. The study variables were analyzed using paired t-tests and Pearson’s correlation coefficient, and the ratios between soft tissue and hard tissue movement were calculated. Results: After surgery, the paranasal area moved forward with a ratio of 0.5, according to vertical movement of B. The upper lip and M U1 showed correlation in the sagittal axis with a ratio of 0.8. The lower lip and M L1 were correlated in the sagittal and vertical axis in a ratio of 1.12 and 0.84, respectively. B′, Pog′, Me′ had a ratio of 0.81.1 with their paired hard tissue landmarks for all axes. Conclusion: Orthognathic surgery using Le Fort I maxillary posterior impaction with B-IVRO mandibular setback results in forward movement of midfacial soft tissues, even though forward movement of the maxilla is limited because vertical movement of the maxillamandible complex causes redundancy of soft tissue and facial muscle and pulling from the retaining ligaments. This midfacial soft tissue change with maxillary posterior impaction could be advantageous to patients who have paranasal depression and protrusion of the upper lip due to proclined upper incisors, which are prevalent among Asian Class III patients.open박

[정책 해설] 창업정책 방향 및 주요 지원사업

Ⅰ. 최근 창업 동향 Ⅱ. 창업정책 방향 Ⅲ. 창업 단계별 지원사업 1. 창업교육 및 저변 확대 가. 연령대별 맞춤형 창업교육 나. 기업가 정신 확산 및 분위기 조성 2. 창업실행 및 사업화 가. 창업선도대학 육성사업 나. 청년창업사관학교 다. 예비기술창업자 육성사업 라. 연구원 특화형 예비창업자 육성사업 3. 창업초기기업 성장 촉진 가. 융자 나. 보증 다. 투자 라. 창업기업 전용 R&D 마. 창업보육센터 4. 원활한 재도전이 가능한 환경의 구축 가. 연대보증 제도 개선 나. 신용회복 및 재창업 지원 Ⅳ. 맺음

Impulsivity as a Predictor of Violence of Suicide Attempts in Schizophrenic Patients

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