• 대한화학회지
• /
• 제20권5호
• /
• pp.364-373
• /
• 1976

多原子分子內의 內部廻轉子上에 있는 磁氣核은 分子의 全體廻轉으로 因하여 생기는 磁氣場뿐만 아니라 內部廻轉에 基因하는 磁氣場과도 相互作用할 수 있다. 이 論文에서는 多原子分子內의 內部廻轉子上에 있는 核스핀에 對한 스핀-廻轉相互作用 Hamiltonian을 誘導하였다. 誘導된 Hamiltonian은 스핀과 全體廻轉間의 相互作用을 나타내는 部分 및 스핀과 內部廻轉間의 相互作用을 나타내는 部分과의 合으로 이루어져 있음을 밝혔다. 스핀-廻轉相互作用 tensor와 磁氣的 가리움效果 間의 關係도 또한 調査하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제22권4호
• /
• pp.451-459
• /
• 1998

THe influence of internal acoustic exitation through a square prism on the turbulent wake flow characteristics was investigated. The intermediate wake region where is about ten times the respective length of the body was experimentally investigated using a conditional phase average technique. At first the static base pressures of square prism and the shedding frequencies have been measured at various internal acoustic exciation frequencies. The experiment were performed under the four cases of internal acoustic excitation frequencies 0Hz 30Hz($St_e$=0.09) 65Hz($St_e$=0.20) 120Hz($St_e$=0.38) And velocity vector fields were presented and discussed. The influence of acoustic exvitation frequencies on the structure of intermediate turbulent wake region is evident. As the internal acoustic frequency increased shedding frequency gradually increased and aerodynamic force decreased. Also it was found that the vortex shedding occurs dratically well and shedding frequency reached nearly the same value as the internal acoustic frequency. but above Strouhal number 0.3 the influence disappeared.

• 한방재활의학과학회지
• /
• 제31권3호
• /
• pp.19-29
• /
• 2021

Objectives To investigate the trends in clinical study on rheumatoid arthritis in all academic fields in Korea. Methods We searched seven Korean web databases for clinical studies published from 2008 to 2021. All identified studies were reviewed and classified by the year of publication, academic field, and study design. Results A total of 347 clinical studies were selected. An average of 26.7 studies were published each year. Regarding the distribution of studies by academic fields, 309 studies were published in the medical field and 17 studies were published during the same period in Korean medicine, and 21 studies were published in other fields. The distribution of studies by study design was as follows: 8 studies, meta-analyses; 5 studies, systematic reviews; 16 studies, experimental studies; and 318 studies, observational studies. Conclusions Multidisciplinary access and management are required for the early diagnosis of rheumatoid arthritis, effective management of disease progression, and prevention of rheumatoid joint deformities. Additionally, study design with high-level of evidence on the intervention of rheumatoid arthritis are warranted.

• 전기학회논문지
• /
• 제56권9호
• /
• pp.1694-1698
• /
• 2007

This study suggests a new fluorescence microscope to observe micro-samples within fluorophore in a variety of biomedical fields including the fluorescence analysis of a biochip, such as a DNA micro-array. A fluorescence microscope is a device for irradiating light onto a micro-object, executing an excitation and fluorescence emission process. In this study, it adopts a total internal reflection fluorescence(TIRF) method to excite a whole micro-sample substrate different from an existing way which uses an evanescent wave resulting from a total internal reflection on the micro-sample surface. Suggested TIRF microscope can reduce optical noise and obtain images with higher sensitivity thus obtain precise information about the density, quantity, location, etc. of a flurophore, and can simultaneously process separate images even when plurality of fluorophores having different excitation and fluorescent wavelength ranges is distributed, thus easily obtain information about the fluorophores.

• Tuberculosis and Respiratory Diseases
• /
• 제42권3호
• /
• pp.419-423
• /
• 1995

Pulmonary histiocytosis X is an idiopathic benign disease characterized by proliferation and infiltration of lung tissue by characteristic Langerhans cells and eosinophils. Pulmonary histiocytosis X is common in young male adults, and shows variable clinical characteristics. We experienced a case of pathologically proven pulmonary histiocytosis X in a 30-year-old man who visit to our hospital due to chest discomfort and cough. The chest radiograph of our patient shows right pneumothorax and characteristic multiple thin-walled cysts on the both upper lung fields. The HRCT shows multiple thin-walled cysts, a few scattered nodules in both upper and right middle lung, and right pneumothorax.

• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회 1996년도 추계학술대회발표논문집; 고려대학교, 서울; 26 Oct. 1996
• /
• pp.162-165
• /
• 1996

In accordance with the growing importance of software in computer systems, software quality and performance has become a hot issue in all computer-related fields and businesses. But the measurement and evaluation of software quality still poses a problem, due to the different viewpoints of software developers and users. This study attempts to combine the external characteristics of quality representing the viewpoint of users, and the internal characteristics representing the viewpoint of developers of quality. In order to do this, this study provides multiple models which select the appropriate internal characteristics which reflect user requirements from earlier phases of development. The goal of this study is to enhance the applicability of 40 internal characteristics of ISO 9126 to the models.

• 에너지공학
• /
• 제2권1호
• /
• pp.38-44
• /
• 1993

Electromagnetic seawater thrusters may be classified into four general categories : internal duct dc, external field dc, internal peristaltic ac, and external peristaltic ac. Internal duct dc thrusters offer the advantages of low magnetic field leakage, simple construction, and potentially high reliability. The most efficient internal duct configuration consists of converging inlet nozzle and a straight discharge duct. Ideal efficiency calculations based on the one-dimensional Bernoulli equation show that thrusters should be designed with large cross-sectional areas and operate at low discharge velocities. In practice, this may be accomplished by using multiple thruster ducts. Conductivity enhancement, high magnetic fields, and long electrodes will also improve efficiency.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권1호
• /
• pp.239-247
• /
• 2020

Technological convergence is yielding new values and affecting various fields not by single technology but by convergence between technologies. This study aims to analyze the IT -BT-NT convergence and differences between technologies in respect of collaboration within (inventor) and between (assignee) organizations. Among the main technologies leading the technological convergence, IT is the most active of converging with other fields. BT is knowledge-intensive and strong cooperative networks are important in this area. NT is applied in various industrial fields upon the basic technology. Using the data on applied and granted patents by Korean applicants in the U.S., this study conducted quantitative analysis and ANOVA to gain the following results. First, the degree of convergence in between IT-BT-NT is continuously increasing since 2002. Second, BT is where the collaboration within and between organizations is the most active among IT-BT-NT. Third, there were certain differences in the degree of convergence according to the years and the fields of technologies in all the IT-BT-NT. Organizations cooperate with other institutions to sustain their competitiveness with limited internal resources. Companies in these fields are recommended to perform diverse strategies to pursue further collaboration with the outside.

• Tuberculosis and Respiratory Diseases
• /
• 제65권4호
• /
• pp.323-327
• /
• 2008

전신성 홍반성 낭창은 자가 면역 질환으로 폐와 흉막을 침범하며, 드물게 다양한 형태의 간질성 폐질환을 일으킨다. 식도 이완 불능증은 식도 운동 질환으로 전신성 홍반성 낭창과 동반한 예는 아주 드물다. 전신성 홍반성 낭창에 속발한 식도 이완 불능증의 기전에 대해서는 향후 연구가 필요할 것으로 사료된다. 전신성 홍반성 낭창에서 간질성 폐렴과 식도 이완 불능증을 동반한 환자를 경험하였기에 이를 보고하는 바이다.

• 소음진동
• /
• 제6권2호
• /
• pp.205-214
• /
• 1996

Active noise control(ANC) requires the full capability of a modern digital signal processing module. This paper describes the digital signal processing unit which is designed for ANC of noise fields in passenger car. System hardware is designed to allow software controlled versatility as well as fully qutomatic operation. The developed system is provided with the ability to be self-operated except the case of upload/download of data and program between the personal computer and the system memory. Experimental results are presented to demonstrate ANC performance of noise fields in lightly damped enclosure and passenger car.