• The Korean Journal of Air & Space Law and Policy
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• v.5
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• pp.207-264
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• 1993

항공사의 외국인 소유는 이것으로 인하여 전체 항공운송 시스템이 변화될 수 있는 핵심적인 개념이다. 작금 항공운송산업을 둘러싼 환경은 급격하게 변화하고 있어서 많은 국가들이 항공사의 외국인 소유와 관련한 기존의 법제나 정책변경을 심각하게 고려하기 시작하였다. 항공기 및 항공사의 국적과 관련한 전통적인 개념은 양자사이에 '진정한' 또는 '효파적인' 관계가 있어야 한다는 것이다. 특별히 항공사의 '실질적인 및 효과적인 통제'조항은 양자 및 다자간 항공운송 협정에서 가장 핵심적인 역할을 해오고 있다. 그러나 변화의 바람이 거세게 일고 있다. 항공운송산업에서 이러한 변화는 미국에서 시작되고 미국의 국제항공관계에 적용되고 있는 규제완화에서 비롯되었다. 미국의 규제완화정책은 합병 및 흡수를 통한 항공사의 집중이라는 결과를 가져와서 항공운송 시장은 궁극적으로 소수의 거대 항공사에 의해 지배될 것이라는 우려를 낳고 있다. 이러한 새로운 추세에 대응하여 많은 국가틀이 다양한 형태의 지역협력체를 형성하고 있다. (예, EC, 아세안, 안데안 그룹, 야마스크로 선언 등) 또한 다수 국가들은 정치.경제적인 이웃에서 정부의 소유주식을 외국인 및 외국회사를 포함한 민간부문에 매각함으로써 사유.사영화를 추진하고 있다. 한편 제조업 분야에서 다국적기업 (IBM, 코카콜라 등)은 별 어력움이 없이 성립될 수 있다. GATT의 주관하에 열리고 있는 우루과이 협상에 참여하고 있는 국가들은 최혜국 대우, 내국인 대우, 시장접근 같은 상품교역의 개념및 원리를 항공운송서비스를 포함한 서비스교역에 적용하는데 기본적으로 합의하였다. 급격히 변화하는 환경에서 항공운송 산업만이 국가의 영공 주권, 항공사의 공익기업 개념, 상업적 이익의 균형교환 같은 자기류의 논리에 집착하여 언제까지나 홀로 고립될 수는 없을 것이다. 더구나 세계 항공운송 산업은 1980년 후반부터 큰 시련에 직면해 있다. 몇몇을 제외한 대부분의 항공사는 세계경제의 불황속에서 초과공급 및 운임전쟁으로 인한 엄청난 적자를 기록하고 있다. 모든점을 미루어볼 때 세계의 항공사들은 과거 어느 때보다도 외국인 투자를 필요로 하고 있으며 항공사가 속해 있는 정부는 외국인 소유에 관한 법제를 개정하고 나아가 전체 항공운송시스템을 개편하도록 압력을 받고 있다. 많은 국가에서 외국인 소유에 관한 법규의 개정은 현존 항공운송 시스템에 다각적인 영향을 가져올 것이다. 다시말하면 양자협상, 반독점및 경쟁볍규의 적용, 고용 및 카보타지등을 포함한 제반분야가 영향을 받을 것이다. 결국 외국인 소유에 관한 법제의 완화는 항공사의 세계화 또는 다국적화의 과정을 촉진시킬 것이고, 항공사간 다양한 형태의 제휴가 이러한 방향에서 계속될 것이다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.5
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• pp.39-52
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• 1993

For the lateral-torsional buckling analysis of the thin-walled space frame and circular arch with the unsymmetric cross section, the tangent stiffness matrices are derived by introducing Vlasov's assumption for the thin-walled beam and using the principle of virtual displacement. In the cases of the unrestrained torsion and the restrained torsion, the elastic and geometric stiffness matrices corresponding to semitangential rotation and semitangential moment are evaluated by using the Hermitian polynomials as the shape function. In order to illustrate the accuracy and convergence characteristics of the derived formulations, numerical examples for the lateral-torsional buckling analysis of the hinged circular arch under pure bending and uniform compression are presented and compared with the analytic solutions of references.

• Education of Primary School Mathematics
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• v.20 no.2
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• pp.131-142
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• 2017

The purpose of the study is to examine the effect of debate and discussion instruction in mathematics class on mathematics study achievements and attitudes in elementary school. To conduct the research, two classes were verified as the homogeneous groups by a preliminary examination on the fourth grade of J elementary school. After mathematics class, the subjects were conducted the same mathematics study achievement and attitude tests in two groups and were analyzed with descriptive statistics, independent t-test, t-test. Accordingly, debate and discussion instruction in mathematics class is more effective than regular lecture method instruction. debate and discussion instruction in mathematics classes are believed students will participate in the question and understand the mathematical principles and concepts themselves through action to solve the problem and influenced I have a positive attitude towards mathematics.

• The Journal of the Convergence on Culture Technology
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• v.6 no.3
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• pp.99-103
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• 2020

The warfare caused a dramatic change when new technology was introduced to the battlefield or when the technology was matured to change the concept of operation. Thus, the rapid development of science since the 19th century is also rapidly changing the aspect and speed of war, and the recent speed of change is making it more difficult to predict future warfare than in the past In particular, in the past, it was difficult to predict the future warfare based on the latest science and technology, because it was difficult to spread and seize advanced science and technology. But global human exchange, technology hijacking by internet, and developing of asymmetric skills and methods caused more complex to technology based warfare prediction. In other words, the nature and principles of war, together with the development of science and technology, should be considered togther to predict future warfare. Therefore this study is based on the thory and principles of war and the latest science and technology to predict the future warfare situation that the military will face.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.83-89
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• 2016

In this paper, we apply the complementation principle of five prime substances to reduce the phase interference. The transmitter and receiver match the concepts of co-operative and conflict to the direct and indirect signals. The result shows we investigate the proposed network topology such as 5 prime substances (5 user networks). The key observation is that optimal symmetric degree of freedom (DoF) can be achieved for 5 user network with different channel coherence times by adaptively selecting the interference alignment scheme via controlling the alignment feasibility of the transmitted signals. Theoretical results demonstrate the effectiveness of the proposed 5 user networks are well matched to the wireless mobile channel environment to achieve the symmetric DoF for different channel coherence times which ensures that the proposed networks are applicable for dense wireless network applications. Modulo 3 functionality in 5 user network topology makes it easier for the transmitter cooperation to achieve the DoF of 2/3 with the help of the interference alignment schemes.

• Journal of Energy Engineering
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• v.5 no.1
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• pp.87-92
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• 1996

This paper formulates dynamic optimization model for Time-Of-Use Rates when a electric power system consists of three generators and a rating period is divided into three sub-periods. We use Pontryagin's Maximum Principle to derive optimal price and investment policy. Particularly the cross-price elasticities of demand are considered in the objective function. We get the following results. First, the price is equal to short-run marginal cost when the capacity is sufficient. However, if the capacity constraint is active, the capacity cost is included in the price. Therefore it is equal to the long-run marginal cost. Second, The length of rating period affects allocation of capacity cost for each price. Third, the capacity investment in dynamic optimization is proportional to the demand growth rate of electricity. However the scale of investment is affected by not only its own demand growth rate but also that of other rating period.

• Informatization Policy
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• v.18 no.4
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• pp.3-21
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• 2011

Knowledge ecosystem means a dynamic knowledge circulation, including knowledge creation, exchange and sharing and utilization. It is also the field of knowledge practice, which creates interactions in knowledge exchange between people and groups. The key premises of knowledge ecosystem, based on the nature of general ecosystems, can be characterized as follows: first, it primarily focuses on social networks between people and organizations participating in the process of knowledge circulation; secondly, knowledge ecosystem thrives on diversity of knowledge; and thirdly, it is significant for selection of valuable knowledge and adoption of appropriate knowledge. This review attempts to make a systematic examination of a wide range of existing studies on knowledge ecosystem. In so doing, it is expected to provide a basis for further inquiry into more critical and complicated issues. Although the scarcity of existing research-at least those in Korea-may limit the implications of findings, this review offers a set of suggestions for future research.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.632-637
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• 2006

Our country's bidding system had made the lowest price successful bid system in foundation before introducing eligibility review system at July, 1995, and a averaged- price successful bid system or the restrictive-lowest price successful bid system had been enforced by repletion. However, they were introduced as dumping that do not reach in direct cost level of construction cost is generalized and worry about illegal construction practices rises by the lowest price successful bid system. According as they had not been promoted construction company's technical development effort or cost reduction effort, vicious circle that advocate competition principle again and recur as the lowest price successful bid system is repeated last 50 years. Therefore, I present improvement direction that can satisfy all Global Standard and real condition of our country through foreign countries example analysis to cope with the rapidly changing building circumstances socially and economically to correspond actively to the construction industry's reorganization to reconsider domestic construction engineering's competitive power.

• Smart Media Journal
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• v.5 no.4
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• pp.103-110
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• 2016

This study aims to establish the standards to give the design weight in case when developing equipment designs, by classifying products with similar purposes in accordance with the morphological characteristics and also extracting the typicality. Limiting the sampling group for the extraction of the typicality to a pendant-type and a ceiling buried-type through the preceding case study and consultation with experts, the survey was conducted for majors and relevant workers in six cities, sampling products released in Korea and Japan before May 2016. The 1st survey was about the Morphological classification, and the 2nd times about the extraction of the typicality while the 3rd one was about the classification of the morphological attributes. By drawing the design attributes based on the functional/morphological classification and formative principles, it aimed to establish the base of the future research on the measurement of design weight. The results of this study aim to efficiently establish the roles of design technology in accordance with changes in the lighting fixture market caused by the substitution of light sources, and also to draw the development direction to rapidly cope with the accelerated changes in lighting design types and corporate R&D.

• Journal of the Korean Society for information Management
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• v.20 no.1
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• pp.251-270
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• 2003

Due to rapid internet supply and the increase of electronic resources including network resources, there has been a sudden change in cataloguing fields. To deal with rapid changes, IFLA revised cataloguing rules for electronic and continuing resources; ISBD(ER) and ISBD(CR), JSC(Joint Steering Committee for Revision of AACR) has published the 2002 revision of Anglo-American Cataloguing Rules, Second Edition. Major changes in both content and format make the release of the 2002 revision momentous. This study is to analyze activities of JSC and rule revisions of AACR2R 2002 edition, expecially in regards with concepts of change to rule 0.24, new categories of bibliographic materials, changes to chapter 3(cartographic materials), chapter 9(electronic materials), chapter 12(continuing materials), definition of a new terminologies, changes in MARC 21 coding, and issues concerned with revision of KORMARC.