• The Korean Journal of Air & Space Law and Policy
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• v.23 no.2
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• pp.93-114
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• 2008

The purpose of this study is to review the changes in the aviation safety management system, how that system has evolved and what forces caused these changes to take place. Also included is an examination of the development process of the aviation safety management system in view of the new institutionalism, identifying the patterns of change. Based on the results of this study, I propose policy methods to design a desirable civil aviation safety system with a view toward raising the safety standards in the Korean civil aviation community. The major analysis variables are as follows: first, aviation accidents caused by external factors and international standards as independent variables second, environmental changes and political processes affecting aviation safety management system as major mediating variables and third, the aviation safety management legal system, the aviation safety management organizations and an expert participation system as dependent variables. The institutional changes and continuance of the aviation safety management system show that when specific circumstances arise, the continuance lasts depending on the path dependency, and in a certain circumstance, when immanent changing factors reach a critical point, the system suddenly changes by a punctuated equilibrium, which are all included in this study.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4B
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• pp.345-352
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• 2002

In this paper, in order to evaluate the performance of IS-95 system reverse link in white gaussian noise and rayleigh fading environment, we suggest epochal proposal to improve computer run-time and its efficiency is verified in terms of the number of samples. MC(Monte Carlo) simulation is the most popular simulation technique lately, but MC simulation requires a number of samples at low bit error rate. Therefore, MC cannot avoid the limit of computer run-time. To alleviate these problems, we apply the suggested method called central moment technique to the reverse link of the IS-95 system and can obtain discrete probability mass functions from Nth order central moments of the less number of received signal samples than those required in MC. Continuous cumulative probability distribution function can be accurately estimated by using interpolation and the improvement effect for the number of samples is proven.

• Journal of the Korean Chemical Society
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• v.42 no.3
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• pp.302-305
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• 1998

The high cholesterol level in the blood stream is the main cause for cardiovascular diseases. Despite considerable worldwide effort to reduce the blood cholesterol level, we still need a remarkable drug. For this reason, the inhibition of cholesterolesterase by synthetic porphyrin complexes was investigated. Some of the phenyl substituted porphyrins inhibited the enzyme and the inhibition constant was in the range of ${\mu}M$. The substituents on the phenyl group of tetraphenylporphyrin did not affect much on the inhibition constant.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.141-147
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• 2014

With the rapid development of major functions in a smartphone, many applications interacting with a smartphone are introduced and mobile applications converged with various related technologies are announced and rapidly disseminated recently. In this paper, we propose the design of a smart mobile application operated with devices like sensors in order to utilize various functions of the smartphone effectively. The mobile application proposed in this paper uses the bluetooth module of the smartphone, composes the wireless ad hoc network with various sensors around us, and collects bionic context information of the user in real time. The smart application designed and implemented in this paper is the sensor based healthy diet application that can fulfill healthy diet program by reflecting the user's sensed bionic context data in real time.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.3
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• pp.9-16
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• 2018

The media facade technique requires the matching process of the content to the projection target. For this reason, each time the projection target is changed, the matching process of the same content must be performed again at each time. This problem can be solved by analyzing the elevation of the object and automatically performing matching process of the content in real time and projecting the matched content. In this paper, we propose and implement a new algorithm that can obtain the optimized matching content in real time by analyzing the elevation of the object to be projected. The proposed method processes the image matching by using the depth information of the elevation obtained by IR cameras.

• Journal of Digital Contents Society
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• v.1 no.1
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• pp.103-110
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• 2000

The emergence of the new technologies, which are represented by multimedia and the internet, brings the tremendous change in respect of process, record, delivery, and transmission of the knowledge and information. The new digital contents made by these technologies help to improve the acquisition efficiency of the knowledge and information by directly and simultaneously stimulating humans' different senses. This paper concentrates on how the accumulated computer technologies such as multimedia and the Internet can be used to make the effective digital contents. This paper suggests four development method for the digital contents and gives the implemented example for each development method.

• Journal of the Korea Society of Computer and Information
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• v.9 no.3
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• pp.183-188
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• 2004

In the course of Internet proliferation. many network-related technologies are examined for possible growth and evolution. The use of Internet-based technologies in private networks has further fuelled the demand for network-based applications. The most Promising among the new paradigms is use of mobile agents. It also however, suffers from a major drawback, namely the potential for malicious attacks, abuse of resources pilfering of information, and other security issues. These issues are significantly hampering the acceptance of the mobile-agent paradigm. This paper proposed the design of strong and safe mobile agent gateway that split and merge the agent code with security policy database. This mechanism will promote the security in mobile agent systems and mobile agent itself.

• Proceedings of the Materials Research Society of Korea Conference
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• 2009.11a
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• pp.17.2-17.2
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• 2009

Al Foam 소재는 다공질 금속으로써 저밀도 및 우수한 충격에너지 흡수능으로 최근 새로운 기능성 재료로 부상하여 세계 각국에서 연구개발이 활발하게 진행되고있다. 특히 이러한 Al Foam재를 자동차용 부품의 충격흡수재로사용할 경우 뛰어난 충격흡수능으로 인해 고안전 차량 부품 개발에 획기적인 기술 적용이 기대된다. 그러나, 종래 Al Foam재를 기계부품 등에 삽입할 경우 발포금속을 제조하여 부품 형상에 따라 가공하여 삽입하였으나 이는 공정 중 추가적인 기계 가공 및 비용이 들며 이에 따라생산성이 떨어지는 단점이 있었다. 따라서 본 연구논문에서는 차량용 충격흡수 부품 제작에있어 추가적인 가공 및 공정 수를 줄일 수 있는 Y-프로세스라는 주조공법을 적용하여 Net 형상 Al Foam재를 제작하였다. Y-프로세스는 Al Foam 금속 용탕이 주형에 투하되었을 때 Net 형상의 주형을 용탕 내 삽입하여 금속 용탕의 발포 및 응고시 Net 형상을따라 발포 및 응고가 되도록 하여 Net 형상의 Al Foam이삽입된 부품을 만드는 공법을 말한다. Y-프로세스로제조된 Al Foam재는 주형 내 완전히 충진되지는 못하였으나 주형내 충진된 Al Foam재의 상하부 셀크기가 비교적 균일한 모습을 나타내어 향후 공정제어를 통해 우수한 품질의 Net 형상 Al Foam 제조가 가능함을 알 수있었다.

• The Journal of the Korean dental association
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• v.39 no.12 s.391
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• pp.1039-1055
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• 2001

불소의 적절한 활용을 통하여 미국인들의 구강건강이 확실하게 증진되었으며 수돗물의 인공적인 불소참가 사업은 지난 2000년 동안에 건강과학이 이룩한 가장 획기적인 건강관리 예방사업으로 인정되었다. 음료수에 불소를 적정량 첨가하여 치아우식증을 퇴치하기 위하여 적극적 예방책을 마련함으로써 치과의학의 과학적인 연구의 기틀을 확고히 하여 치과의학이 현대 건강과학의 지도적 위치를 확보하는 과정에 중요한 임무를 담당했다. 그러므로 미국의 중앙건강관리 및 예방 연구소는 정기적으로 불소사용과 관련된 연구 업적들에 대하여 관련 분야의 세계적인 학자들로 하여금 조리 정연하게 주기적으로 분석 검토하여 구강건강을 향상시킬수 있는 방안을 제시하기 위하여 불소사용법에 대한 안내서를 마련하고 있다. 미국 중앙 질병 관리 및 예방연구소는 평생을 불소에 관한 연구를 하고 있는 11명의 전문가들과 긴밀한 연락을 취하면서 22명의 과학자들과 함께 그 동안에 발표된 관계문헌 270개를 분석 검토하여 2년동안에 걸쳐 작성한 최근의 불소 사용 안내서를 지난 2001년 8월 17일 발표했다. 그 내용이 중요하고 한국의 치과의사들에게 큰 도움이 되리라고 확신하기 때문이다. CDC의 허락을 받고 한글판을 작성하게 되었다. 한국의 관심 있는 독자들의 이해를 돕기 위하여 더욱 자세한 내용을 알고자 하는 분들이 실무진에 참여한 연구자들 및 과학자들과 직접 접촉할 수 있도록 그들의 직책과 현재의 소속을 밝혔으며 이 안내서에 사용된 문헌 270개 참고문헌 전체를 소개한다

• Journal of the Korea Computer Industry Society
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• v.5 no.8
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• pp.801-810
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• 2004

It is only 2 ~ 3 years in the interior to be introduced as a Ubiquitous era after going through mainframe, PC and internet era on account of the advent of computer. This thesis intends to present a model device of an epoch-making cash management system using the RFID(Radio Frequency Identification) Tag and EPC (Electronic Product Code) Platform which are core technologies of the Ubiquitous Computing on the assumption that cable and wireless internet is constructed in university. Also this sets up a purpose to minimize the administrative procedure as well as the waste of time, people and cost which are problems of the cash management system operating now. Therefore as a research project hereafter, it will be able to present an imporvement device about the problems which cannot solve these days through the model of the proposing cash management system when the standardization, normalization and commercialization of advanced IT department are accomplished.