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RISS 인기검색어
- 검색키워드
- 저자 : 최낙선 (검색결과 9 건)
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최낙선 경상대학교 산업대학원 2008 국내석사
The ability to predict radar return from an object becomes a critical technology issue in the development of military platform. There are several methods to compute radar cross section(RCS) such as geometrical optics, physical optics method, method of moments and full equation method. In this paper physical optics method was used to predict the helicopter RCS. In-house code using MATLAB was developed and validated with a simple mathematical model of circle, cylinder and planar plate. The commercial program based on physical optics and physical theory of diffraction was utilized to validate the in-house code result of helicopter RCS prediction. RCS characteristics of the rotating main rotor blade was evaluated and suggested to be taken into consideration for low scattering structure for helicopter survivability increase. Assuming whole body of the helicopter to be perfectly conducting surfaces, configuration of helicopter body was tried to change to evaluate the effect of the RCS variations. The peak value of the RCS was predicted from 90 degrees in azimuth and the RCS was reduced according to configuration changes.
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최낙선 東亞大學校 敎育大學院 1990 국내석사
The latest labor-management problem has become an object of serious public concern in the advanced countries as well as the developing countries. All sorts of labor-management disputes has raised economic and social losses and has even threaten national security, consequently, the problem of what sorts of labor-management disputes has raised economic and social losses and has even threaten national security, consequently, the problem of what sorts of labor-management relation and cooperation will be suited to our real condition has become on important task to the individual enterprises for political, social, economical stability and development. The labor-management relation should be settled in the more rational and autonomous course. It should break from the premodern type, and wipe out the subordinate relationship and the elements of authoritarianism. Then they should have collective negotiations as equals. Also they should solve problems through conversation and mutual concessions which maintains industrial peace and makes democrat relationship. To achieve these, followings are analyzed and investigated in this study. 1. 1) The nature of labor-management relation. 2) The basic structure of labor-management. 3) The surroundings of labor-management relation. 2. The process of the development of labor-management relation in Korea. 3. The structures of labor-management relation in the leading countries- U.S.A., Japan, the United Kingdom, Germany and France. 4. The characteristics of labor-management relation in Korea. 5. The analysis of the real condition of Korean labor-management relation. 1) The organization and management of the Union. 2) The collective agreement and disputes. 3) The council system of labor-management. 4) The legal restrictions to labor-management relation. 6. Characteristics and problems of Korean labor management relation in the summarization and the conclusion. 1) The formation of labor-management relation centered with family. 2) The lack of self-control of labor-management relation. 7. The directions to settle of labor-management relation. 1) The formation of self-controled labor-management relation. 2) The realization of democratic labor-management relation.
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乳房癌에서 骨髓微細轉移와 腫瘍내 血管新生度와의 관계에 대한 연구
유방암에서 종양 혈관 신생도는 국소 재발 혹은 원격전이와 밀접한 관계가 있다고 알려져 있기 때문에, 혈관 신생도를 유방암 수술 후 예후 인자로 이용하고 있다. 그러나, 아직까지는 혈관 신생도와 암 전이 과정의 관계가 확실히 규명되지 않았다. 이에, 본 저자는 혈관 신생도와 유방암 원격전이에 관여하는 골수 미세 전이와의 관계를 규명하고자 하였다 본 연구는 전남대병원에서 유방암으로 근치적 유방절제술을 시행 받은 70명의 환자를 대상으로 하였다 골수 미세 전이의 검사는 cytokeratin의 mRNA를 목표로 한 RT-PCR방법을 이용하였으며, 혈관 신생도는 파라핀 포매괴를 면역조직화학염색법을 이용하여 분석하였다. 결과는 다음과 같다. 1. 유방암 수술 환자에서 골수 미세 전이의 발생율은 약 17.1%(12/70)이었다. 2. 유방암에서 골수 미세 전이는 액와 림프절 전이와 밀접한 관계가 있었다. 3. 유방암에서 높은 혈관 신생도는 골수 미세 전이 가능성이 높아진다. 4. 신생혈관 개수와 골수 미세 전이의 정량적 연관성은 추후 연구를 통해 밝혀질 것이다. 결론적으로 유방암에서 종양 혈관신생은 골수 미세 전이의 필수적인 과정이다 하지만, 혈관신생 만으로는 충분하지 않으며, 앞으로 연구를 통해 혈관신생과 관련된 골수 미세 전이에 관여하는 인자를 밝혀야 하겠다. Since some authors reports that tumor angiogenesis in breast cancer is significantly correlated with the presence of local or distant metastases, many clinicians determined the tumor angiogenesis just as one of the prognostic factors. However, a consistent role of tumor angiogenesis in metastatic progression was not completely determined until yet. We tried to evaluate the direct relationship between tumor angiogenesis and bone marrow micrometastases to revel the actual contribution of tumor angigenesis to systemic spread of cancer cells in breast cancer patients. Seventy patients with breast cancer who underwent curative surgical resection were included in this study. We observed the micrometastases in bone marrow with RT-PCR method targeting to mRNA for cytokeratin and tumoric angiogenesis with image analyzer technique followed by immunohistochemical staining to CD 34 from formalin-fixed, parafin-embedded specimens. The results of analysis are as followed, 1. Incidence of bone marrow micrometastases was 17.1% (12/70) in surgically curable breast cancer patients. 2. Possibility of bone marrow micrometastases tend to be increasing with an association of the presence of axillary lymph node invasion 3. High tumor angiogenesis is associated with a high risk of bone marrow micrometastases 4. A possible quantitative relationship was noted between the number of new vessels and bone marrow micrometastases, even though a statistical support need in further study. In conclusion, high tumor angiogenesis is necessary for bone marrow micrometastases but, not sufficient by itself. A further study may need to reveal other factors contributing the bone marrow spread of cancer cells, assoiciated with angiogenesis.
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블랙박스 개념을 이용한 전자기 결합 시스템의 최적 설계
Research on electromagnetism-related coupling system recently features system modeling using analysis tools for a exact solution and experiment to verify the system models. In engineering, after there was active research on the analysis of systems, it has been naturally advanced the study on the optimization of the systems. So the need for the optimal design of the coupled systems is on the rise. Capitalizing on this trend, this paper presents an efficient methodology for the optimal design of electromagnetism-related coupling systems. It is very difficult to apply existing optimization techniques to the optimal design of electromagnetism-related coupling system on account of complexity and diversity of the coupled systems. Existing optimization techniques can be divided into a sampling-based optimization and a sensitivity-based optimization. The former is inefficient way to optimize the coupled systems because many sampling point is necessary to express strong nonlinearity of the coupled systems. The latter is difficult to find their generalized design sensitivity due to complexity and variety of the coupled systems. To overcome the limitations of the existing techniques and propose a design method that is generally applicable to coupled systems of various combinations, this paper presents a black-box modeling concept. Proposed design methodology based on a black-box modeling concept is a available method to be equally applicable to coupled systems of any combinations and make good use of strengths of two different optimization method as a hybrid method that integrates sampling-based and sensitivity-based approach. The main features of the proposed method are summarized as three views. The first is a black-box modeling concept. For this feature, the proposed method is applicable to various coupled systems without consideration of weakly/strongly coupled. And if the coupled system is confirmed as well-defined, the proposed method can be easily implemented even without in-depth knowledge of the coupled system and access to internal data of the simulators. The second is surrogate models combined with a local window. Most research works used surrogate models in the entire design space. So it is obvious that, as the number of design variables increases, the computation cost increases because lots of sampling points are required for the surrogate modeling and optimization process on the entire design space. But generating the surrogate models in a relatively small design space at a nominal design point, it is clear that the number of random sampling points can be significantly reduced as well as design iterations compared with the conventional sampling-based optimization. The last is sampling-based sensitivities in a local window. So highly accurate design sensitivities can be extracted from Jacobian matrices of the locally generated surrogate models. And the sensitivities can be calculated even for any complex coupled systems because of obtaining sensitivities from surrogate models. And it has acceptable computation cost for the design method using first-order sensitivities. Accuracy of the optimal solutions with the proposed method is verified by using strongly nonlinear mathematical examples. And the proposed method is applied to a simple electromagnetic design problem and is compared with the sensitivity-based optimization adopting the finite difference method in terms of accuracy and efficiency. Further, it is verified that this method can search an optimum of the coupled systems even with a relatively small number of design iterations and also can easily control coupled system's performances simultaneously.
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연속체 민감도법을 이용한 유전체 도파관 필터의 최적 설계
Engineering consists of a number of well established activities, including analysis, design, fabrication, sales, research, and the development of systems. The design of systems is a major field in the engineering profession. The design of systems can be formulated as problems of optimization in which a measure of performance is to be optimized while satisfying all constraints. Many numerical methods of optimization have been developed and used to design better systems. This thesis deals with the mathematical and automatic method based on electromagnetics and CDSA(Continuum Design Sensitivity Analysis) for the optimal design of dielectric waveguide filters. There has been a lot of progress in the field of the optimal design method for the electromagnetic devices. Until the late 80's, most electromagnetic devices were designed by the trial and error method, which was expensive and time-consuming. In the early 90's, two main branches of the optimal design method for the electromagnetic devices began to develop separately. The zero-order optimization methods belonged to the first category. The default zero-order algorithm is to manually experiment with the different setups of the devices. The other branch was composed of the first-order optimization methods. This methods is equal to apply the design sensivitity analysis, which has been established and developed in the structural engineering. The design sensitivity analysis is divided into two methods, the numerical differentiation method and the analytic differentiation method. And the analytic differentiation method is divided into two approaches, the discrete approach and the continuum approach. The continuum design sensitivity analysis based on the continuum approach of the analytic differentiation method is more powerful and useful than others. It is independent of the number of design variables and has fast convergence due to using gradient information of objective function. In addition, It is easy to connect between this method and the commercial electromagnetic tools. However, for difficult understanding, implementation of CDSA and a complicated high-frequency formula, the research of CDSA has been restrictedly applied to low-frequency electromagnetic problems until now. In this thesis, by defining the high-frequency formula of CDSA with the material derivative, Lagrange multiplier method and variational functional, the application of the CDSA is extended from low to high frequency electromagnetic problems. And to apply design sensitivity to electromagnetic problems, the automatic system for the optimal design was built, which is constituted by MS-Excel, extra practical programs, HFSS as commercial electromagnetic tool for high-frequency. Testing the dielectric waveguide filter with the automatic system, the availability and accuracy of proposed method was verified in the frequency domain problem and the merits of the automatic system and sensitivity method could be confirmed.
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