• The Journal of Korean Philosophical History
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• no.42
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• pp.165-195
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• 2014

This paper aims to examine the meaning of 'Xuan(玄)' in the cosmology and astronomy, especially in the view of Yang-xiong(揚雄) and Ge-hong(葛洪). The cosmology of the ancient China has opened a discussion about the Tian(天), through the discussion about the celestial structure, the structure and the location relation of the heaven & earth, in the Han-dynasty has been found a systematic theory. But in the ancient Chinese philosophy, the cosmology has been developed in the field of the astronomy & the Oriental calendar. In this context, Yang-xiong(揚雄) and Ge-hong(葛洪) have founded the system of the cosmology, it is as in the following. First, Yang-xiong criticized sharply the theory of Gaitian(蓋天說) and advanced the theory of Huntian(渾天說). And Ge-hong support the theory of Huntian(渾天說) and also accepted the theory of Xuanye(宣夜說). Second, Yang-xiong(揚雄) and Ge-hong(葛洪)'s cosmology is regarded as the theoretical premise of their cosmogony. As the discussion about the celestial structure, the structure and the location relation of the heaven & earth, both scholar discussed about the cause of creation, the differentiation process. And in the this context, they founded the cosmology as the concept 'Xuan'. Third, the concept 'Xuan' in the both scholar forms a philosophical system. Yang-xiong insisted that the concept 'Xuan' is the basis of the universe, the human-being and the society. While through realizing the concept 'Xuan', Ge-hong tried to pursue the human-being's agelessness and the eternal life. In this way, their view point of the cosmology is comprised of cosmogony & astronomy. With this perspective, they are going to found the system of their own philosophy.

• The Bulletin of The Korean Astronomical Society
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• v.39 no.2
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• pp.44.1-44.1
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• 2014

최근 연구에서 발디 등은 우주론적 축퇴라는 이슈를 부각시켰다. 우주론적 축퇴는 실제 우주가 다수의 대안 우주론을 동시에 복합적으로 가질 때 거대 구조를 이용한 기존의 통계적인 방법만으로 우주론을 단정적으로 구별해 내기 충분치 않다는 것을 의미한다. 이 연구에서는 초은하단 스파인(spine)의 비크기(specific size)가 우주론적 축퇴를 완화할 수 있는지 조사하였다. f(R) 중력과 무거운 중성미자가 동시에 복합적으로 적용되는 다체 수치실험의 헤일로들을 분석한 결과, f(R) 중력이 비크기에 미치는 영향을 최대한으로 억제하는 ${\sum}_im_{{\nu}_i}$의 값이 기존의 통계적인 방법들에서 얻은 값과 다름을 확인하였다. 더 나아가 z=0.3 이상의 높은 적색편이에서는 f(R) 중력과 ${\sum}_im_{{\nu}_i}$ 조합한 모든 우주에서의 초은하단 평균 비크기가 표준 우주론인 ${\Lambda}$ CDM과 통계적으로 유의미하게 달라지는 것을 확인하였다. (arXiv:1404.3639v1)

• Journal of Aerospace System Engineering
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• v.13 no.5
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• pp.72-78
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• 2019

Inlet hammershock is the critical loads condition for designing the inlet duct structure of a fighter. The sudden flow reduction in engine compressor causes inlet hammershock with high pressure. The traditional method was used to combine extreme conditions (maximum speed, sea level altitude, and cold day) to analyze this compression wave inlet hammershock pressure. However, after the 90s there have been papers that presented the probabilistic approach for the inlet hammershock to achieve the appropriate design pressure. This study shows how to analyze the inlet hammershock pressure by making practical use of the Republic of Korea Air Force real flight usage data under probabilistic approach and then analyze approximately 30% decreased inlet hammershock pressure compared with the traditional valve.

• Journal of Scientific & Technological Knowledge Infrastructure
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• s.8
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• pp.26-35
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• 2002

초기 컴퓨터는 주로 원자핵물리와 관련된 계산에 사용되었으나 곧바로 컴퓨터의 도움을 받아 물리 문제를 해결하고자 하는 방법은 물리 전 분야에서 광범위하게 적용되었다. 물질의 가장 작은 요소를 찾고자하는 소립자물리학에서부터, 물질의 성질을 규명하는 응집물질물리, 나아가서 거대 우주의 구조를 밝히고자 하는 우주론에 이르기까지 컴퓨터의 사용이 확장되고 있다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.8
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• pp.619-624
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• 2013

To predict the probabilistic service life, statistical factors should be included to consider the uncertainty of parameters. Generally the probabilistic analysis is one of the common methods to account the uncertainty of parameters on the structural failure. In order to apply probabilistic analysis on the deterministic life analysis, it would be necessary to introduce Probability of Failure(PoF) and conduct risk assessment. In this work, we have studied probabilistic risk assessment of aircraft structures by using PoF approach. To achieve this goal, the Bayesian method was utilized to model PoF estimation since this method is known as the proper method to express the uncertainty of parameters. A series of proof tests were also conducted in order to verify the result of PoF estimation. The results from this efforts showed that the PoF estimation model can calculate quantitatively the value of PoF. Furthermore effectiveness of risk assessment approach for the aircraft structures was also demonstrated.

• Journal of Aerospace System Engineering
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• v.18 no.2
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• pp.12-20
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• 2024

The application of reinforcement design to ensure the structural safety of electronics in small satellites is limited by the spatial constraints of the satellite structure during launch vibrations. Additionally, a reliable evaluation approach is needed for mounting highly integrated devices that are susceptible to fatigue failure. Although the Steinberg fatigue failure theory has been used to assess the structural integrity of electronic devices, recent studies have highlighted its theoretical limitations. In this paper, we propose a structural methodology based on the critical strain theory to design the digital control unit (DCU) of the X-band SAR payload component for the small SAR technology experimental project (S-STEP), a small satellite constellation. To validate the design, we conducted modal and random analyses using simplified modeling techniques. Based on our methodology, we ultimately demonstrated the structural safety of the electronics through analysis results, safety margin derivation, and functional tests conducted both before and after the launch test.

• Journal of Service Research and Studies
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• v.9 no.4
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• pp.1-17
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• 2019

This study was conducted to establish a service philosophy as a major ideology in the New Economy and Society. The service philosophy, which is the ideological foundation to lead the service economy era, should be an idea that can develop the new economy society, reflecting the nature principle of the universe and human being. The service philosophy was derived based on the study of the human representative ideology and the study of the new economy and service essence. A good idea must be consistent with the principles of the universe and be consistent with the essence of the human representative ideology, so that it reflects the core principles of the universe and the core of human representative ideas. In addition, the central idea should reflect the changes of the New Economy Society in the future. Therefore, the essence of the service and the change of the New Economy Society were analyzed. We analyzed the social and philosophical significance of the macroscopic cosmology and the microscopic quantum theory of modern physics. We analyzed the essence of Oriental and Western representative ideas and derived implications of these ideas from the viewpoint of modern society where service is central. Based on the essence principle of the universe and human, we have established the service philosophy structure and derived the human, historical, social, economic, and managerial aspects of service philosophy. The structure of the derived service philosophy was presented, and discussions were conducted for future research.

• Journal of Scientific & Technological Knowledge Infrastructure
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• s.8
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• pp.12-21
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• 2002

초기 컴퓨터는 주로 원자핵물리와 관련된 계산에 사용되었으나 곧바로 컴퓨터의 도움을 받아 물리 문제를 해결하고자 하는 방법은 물리 전 분야에서 광범위하게 적용되었다. 물질의 가장 작은 요소를 찾고자하는 소립자물리학에서부터, 물질의 성질을 규명하는 응집물질물리, 나아가서 거대 우주의 구조를 밝히고자 하는 우주론에 이르기까지 컴퓨터의 사용이 확장되고 있다. 이러한 확장은 전산물리^[2]라는 물리의 큰 분야를 형성하였고 현재 미국물리학회의 14개 분과 중 하나로 자리 매김하고 있다.^[3]

• Journal of Aerospace System Engineering
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• v.15 no.1
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• pp.47-55
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• 2021

When an abnormal landing occurs, aircraft structures should be designed to guarantee occupants survivability without preventing egress. To find out fire root causes at crash, lots of fixed aircraft crash tests were conducted. Appropriate crash load factors were established with the comprehension of structural behavior based on dynamic analysis and investigation of human tolerance. Cargo restraint criteria were set up considering passengers safety and operational cost while analyzing past cargo aircraft accident data using a probabilistic approach. Reviewing results of past crash tests, current crash landing load factor was appreciated physically, medically, and economically.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.688-690
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• 2002

인터넷과 웹의 팽창과 함께 가용 정보의 양이 폭발적으로 증가하고 있으나 이에 대응되는 효과적이고 효율적인 정보 검색능력의 지원이 없다면 이와 같은 방대한 정보들은 정보 이용자들에 있어 이용 가치가 없으며 이는 곧 정보 범람(information overflow)을 의미한다. 본 논문에서는 이에 대한 해결 방안으로써 사용자의 편이성과 정보검색 능력을 극대화할 수 있는 자연어 질의 문맥 구조 기반 개인형 메타 정보검색 엔진을 제안하고자 한다.본 방법론은 자연어 질의를 기본 입력 형태로 하여 자연어 질의의 문맥 구조(context structure) 및 기타 정보 평가 요소들을 이용하는 다척도(multi-criteria)의사 결정 기법 및 개인형 메타 정보 평가(information rating) 방법론으로 구성되어 있으며 이를 위한 시스템 설계를 제안한다.