초음파에 대한 ICR Mouse 착상전기의 개체 Level 영향(기형.애사망)으로부터 초음파의 물리학적 특성

송재관,김예현 대한방사선과학회(구 대한방사선기술학회) 1995 방사선기술과학 Vol.18 No.2

기계번역을 위한 한국어 특징에 관한 연구

송재관,우근신,박찬곤 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1

Morphological analysis is the first work in a natural language processing. Classification of part-of-speech in morphological analysis is surely necessary. There are many researches about it. But, because standard of the classification of part-of-speech is various, it doesn't have consistency. So, syntactic structure of the Korean language is expressed complicatedly, and it declines the efficiency about a machine translation. This study extracts a morphological feature to appear in a part-of-speech tagging with unique standard. it suggests an algorithm of automatic part-of-speech tagging. This algorithm can extract a syntactic structure of the Korean language and minimize the difference of syntactic structure with object language to machine translation. The syntactic structure extracted can form a sentence pattern of object language to machine translation.

수열합성법으로 제막한 MoO₃ 나노 구조체를 정공수송층으로 갖는 페로브스카이트 태양전지 특성분석

송재관,안준섭,한은미,Song, Jae-Kwan,Ahn, Joon-Sub,Han, Eun-Mi 한국재료학회 2020 한국재료학회지 Vol.30 No.2

MoO₃ metal oxide nanostructure was formed by hydrothermal synthesis, and a perovskite solar cell with an MoO₃ hole transfer layer was fabricated and evaluated. The characteristics of the MoO₃ thin film were analyzed according to the change of hydrothermal synthesis temperature in the range of 100 ℃ to 200 ℃ and mass ratio of AMT : nitric acid of 1 : 3 ~ 15 wt%. The influence on the photoelectric conversion efficiency of the solar cell was evaluated. Nanorod-shaped MoO₃ thin films were formed in the temperature range of 150 ℃ to 200 ℃, and the chemical bonding and crystal structure of the thin films were analyzed. As the amount of nitric acid added increased, the thickness of the thin film decreased. As the thickness of the hole transfer layer decreased, the photoelectric conversion efficiency of the perovskite solar cell improved. The maximum photoelectric conversion efficiency of the perovskite solar cell having an MoO₃ thin film was 4.69 % when the conditions of hydrothermal synthesis were 150 ℃ and mass ratio of AMT : nitric acid of 1 : 12 wt%.

삼면성 심초음파

송재관 대한순환기학회 1997 Korean Circulation Journal Vol.27 No.2

페로브스카이트 태양전지 안정성 개선을 위한 광활성층 연구 현황과 전망

송재관,김도형 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.1

Development of efficient methods for clean energy production became a critical issue to improve the quality of human lives. Solar cells is considered as one of the alternative solutions to resolve the issue. Although Si-based solar cells are only popularly utilized for practical applications, high manufacturing cost is considered as a serious drawback for further versatile applications. Thus, different types of are being investigated aiming to replace the Si-based solar cells. Recently, perovskite solar cells (PSC) are considered as a potential replacement for Si-based solar cells due to their low production cost, high power conversion efficiency, light weight and possibility of flexible device fabrication. Thus, we have reviewed the challenges of PSC faced with practical application, particularly on stability. 화석 연료를 이용하는 에너지원이 심각한 환경오염을 일으키고, 인류의 건강한 삶에 큰 영향을 주어 청정한 에너지자원의 개발은 매우 중요한 이슈가 되었다. 화석 연료를 대체하기 위한 다양한 에너지원의 개발이 진행되고 있으며, 그중 최근에는 태양 전지에 대한 관심이 점차 커지고 있다. 현재 실용화 되어 있는 태양전지는 실리콘 기반 태양전지인데, 제조비용이 큰 단점이 부각되고 있으며 이에 따라 이의 단점을 개선하기 위한 노력과 동시에 실리콘 기반 태양전지를 대체하려는 시도가 이루어지고 있다. 이중 실리콘 기반 태양전지를 대체할 후보로 페로브스카이트 태양전지가 큰관심을 받고 있는데, 그 이유는 높은 광전 변환 효율, 저렴한 제조비용, 유연한 형태로의 제조 가능성 때문이다. 그러나 현재 보고되고 있는 페로브스카이트 태양전지는 장기적 안정성이 떨어지며, 또 납으로 인해 신체에 유해하다는 큰단점을 가지고 있다. 본 리뷰에서는 페로브스카이트 태양전지의 장기적 안정성을 높이는 방안들 그리고 환경적으로 유해한 납을 사용하지 않는 방안들의 최신 연구 방향 동향에 관하여 살펴보았다.

高感度 放射線畵質의 基本理論

宋在寬 대구보건대학 1984 대구보건대학 論文集 Vol.8 No.-

Medical diagnostic imaging has been greatly widened in its scope of application beyond mere radiography to include also digital radiography, ultrasonography, X-ray computerized tomography (XCT), as well as applications of nuclear magnetic resonance (NMR), and sonic waves. with the achievement of these new developments in modern medicine, specialists have come to expect much higher quality in finished radiographs New methods for the evaluation of radiograph quality have been developed in rapid succession over the years, but the majority of these methods resort to complicated mathematical equations. These complexities seem to circumvent adequate comprehension. This paper has been prepared in the simplest possible terms to provide an understandable coverage of the factors that govern the quality of finished radiographs.

放射線이 人體에 미치는 影響과 效果

宋在寬 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-

It is known beyond a shadow of a doubt that ⅹ-rays are harmful. If sufficiently intense they can cause cancer, leukemia, and genetic damage. What is not known for certain is the degree of effect following diagnostic levels of ⅹ-radiation. We do know that the benefits derived from the diagnostic application of ⅹ-rays in medicine are enormous. It is the job of the technologist, along with the radiologist, physicist, and maintenance engineer, to produce high-quality ⅹ-ray studies with a minimum of radiation exposure. This approach can result in the highest benefit and the smallest risk. The effects of ⅹ-rays on humans are the result of interactions at atomic levels. These atomic interactions take the form of ionization or excitation of orbital electrons and result in the deposition of energy in tissue. The deposited energy can result in a molecular change, the consequences of which can be disastrous if the molecule involved is critical. Fig.⑴ summarizes the steps between radiation exposure and latent wholebody injury When an atom is ionized, its chemical binding properties change. If the atom is a constituent of a large molecule, the ionization may result in breakage of the molecule or relocation of the atom within the molecule. The abnormal molecule may in time function improperly or cease to function, which can result in serious impairment or death of the cell. This process is not irreversible. At each stage in the sequence it is possible to recover from radiation damage. Ionized atoms can become neutral again by attracting a free electron. Molecules can be mended by repair enzymes. Cells and tissues can regenerate and recover from the radiation injury. If the radiation injury occurs within minutes or days after radiation exposure, it is classified as an immediate or early of radiation. On the other hand, if the human injury is not observable for many months or years, it is termed a delayed or late effect of radiation. The following outline summarizes the possible early and late human responses to radiation exposure. In addition many other radiation responses have been experimentally observed in animals. Most of the human responses have been observed following rather large radiation doses. But we are cautious and assume that even small doses are harmful.

X-線에 의한 光電收率計算에 關한 硏究

宋在寬 대구보건대학 1978 대구보건대학 論文集 Vol.4 No.-

X-rays contribute to electron emission om material surfaces primarily through iotoelectric interaction. A simple model ; described for predicting the yield and nergy spectrum of photon and Auger elctrons emitted from materials exposed o X-ray with low energy. In this paper, we have calculated the yield of primary, Auger, and secondary ectrons. The results of the photoelecic yield mode developed here suggests 1) The angular distribution of emitted electrons (Perunit angle) is proportional to sinθ cosθ for all electron energies and all componants (Primary, Auger, or secondary) II) The shape of the energy specturm of the photoelectric yield is independent of angle. III) For thin targets the forward and backward photoelectric yields are identical

경식도초음파로 진단한 Aortic Intramural Hematoma 2예

송재관,강덕현,이기만,추윤호,정상식,김재중,박성욱,박승정,이종구 대한순환기학회 1994 Korean Circulation Journal Vol.24 No.6

Bicuspid Aortic Valve: Unresolved Issues and Role of Imaging Specialists

송재관 한국심초음파학회 2015 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.23 No.1

Bicuspid aortic valve (BAV) is the most common congenital heart disease with marked heterogeneity in many aspects. Fusionpatterns of the aortic cusp are quite variable with different type and severity of valvular dysfunction. Moreover, non-valvularcardiovascular abnormalities are associated with BAV. Among them, aortic aneurysm/dissection is the most serious clinicalcondition with variable patterns of segmental aortic dilatation. Potential association between BAV phenotype and valvulopathyor aortopathy has been suggested, but needs to be tested further. A lack of long-term outcome data at this moment is responsiblefor unresolved debate regarding appropriate management of patients with BAV, specifically to prevent development of aorticdissection. Long-term follow-up data of a well-characterized cohort or registry based on standardized classification of BAVphenotype and aortopathy are necessary for evidence-based medical practice. Advanced imaging techniques such as computedtomography or magnetic resonance imaging offer better opportunities for accurate phenotype classification and imagingspecialists should play a central role to establish a collaborative multicenter cohort or registry.