• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.330-339
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• 2008

Ground-based interceptors(GBI) comprise a major element of the strategic defense against hostile targets like Intercontinental Ballistic Missiles(ICBM) and reentry vehicles(RV) dispersed from them. An optimum design of the subsystems is required to increase the performance and reliability of these GBI. Propulsion subsystem design and optimization is the motivation for this effort. This paper describes an effort in which an entire GBI missile system, including a multi-stage solid rocket booster, is considered simultaneously in a Genetic Algorithm(GA) performance optimization process. Single goal, constrained optimization is performed. For specified payload and miss distance, time of flight, the most important component in the optimization process is the booster, for its takeoff weight, time of flight, or a combination of the two. The GBI is assumed to be a multistage missile that uses target location data provided by two ground based RF radar sensors and two low earth orbit(LEO) IR sensors. 3Dimensional model is developed for a multistage target with a boost phase acceleration profile that depends on total mass, propellant mass and the specific impulse in the gravity field. The monostatic radar cross section (RCS) data of a three stage ICBM is used. For preliminary design, GBI is assumed to have a fixed initial position from the target launch point and zero launch delay. GBI carries the Kill Vehicle(KV) to an optimal position in space to allow it to complete the intercept. The objective is to design and optimize the propulsion system for the GBI that will fulfill mission requirements and objectives. The KV weight and volume requirements are specified in the problem definition before the optimization is computed. We have considered only continuous design variables, while considering discrete variables as input. Though the number of stages should also be one of the design variables, however, in this paper it is fixed as three. The elite solution from GA is passed on to(Sequential Quadratic Programming) SQP as near optimal guess. The SQP then performs local convergence to identify the minimum mass of the GBI. The performance of the three staged GBI is validated using a ballistic missile intercept scenario modeled in Matlab/SIMULINK.

• International Journal of Advanced Culture Technology
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• 제6권4호
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• pp.152-157
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• 2018

In the late 19th century and early 20th century, Among those of the Northeast Asia three countries, school physical education and military-style gymnastics of Chosun can be regarded as having been the most nationalistic. The adoption of modern physical education in public schools was from the proclamation of 'the Order on Building the Country through Education by King Gojong in February 1895. This paper intends to examine the process of adopting military-style gymnastics education which played the central role in school physical education in the late Chosun period. But, unlike the common guess that military-style gymnastics in public schools in late Chosun would have been full of patriotism and nationalism, the textbooks and teaching contents of Chosun Military Officers' School were very similar to those of Japan, which is an unexpected fact. Therefore, Chosun decided to accept the Japanese-type military-style gymnastics and military training to improve physical strength of youngsters and military power. The fact that, with the advent of modern education, physical education was emphasized above all else has a very important meaning to the history of Korean physical education. Physical activity education emerged as a major education course which had been unthinkable in previous ages. The second characteristics is that the process of adopting military-style gymnastics and its contents were influenced by Japan Third, even if military-style gymnastics was imported from Japan as part of school physical education course in late Chosun period, its aim was to train military man powers for the independence movement against Japan, rather than to develop harmonious body.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.1895-1904
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• 2014

본 연구에서는 의료관광의 서비스청사진과 AHP분석기법을 적용하여 서비스 품질을 향상시킬 수 있는 방안을 모색하고자 한다. 서비스 청사진은 서비스 전달 시스템에서 발생 가능한 실패 요인을 식별하기 위해 널리 이용되고 있으며, AHP분석은 다 기준 의사결정 과정에서 상대적 중요성을 평가하는 유익한 방법으로 인정받고 있다. 중국 의료관광객 입장에서 경험 가능한 위험을 이해하고, 이에 대한 개선 과정에서의 우선순위를 제안하고자 한다. 이를 위하여 다음의 연구과정을 수행하였다. 첫 번째 단계에서 한국의 의료관광에 대한 기존 문헌을 조사하고, 서비스 청사진을 작성하였다. 두 번째 단계에서는 중국 환자들에게 서비스를 제공하는 과정을 경험한 전문가에게 제안된 서비스 청사진에 대해 검토를 요청하였다. 세 번째 단계에서는 검토된 서비스 청사진에서 발생 가능한 실수가능점을 추출하여, 이에 대한 우선순위를 파악하고자 하였다. 이 과정에서 중국 환자들이 느끼는 상대적 중요성을 추측할 수 있는 전문가를 대상으로 한 AHP방법이 적용되었다. 하위의 세부항목이 존재하는 4개의 단계(도착 및 환영, 입원과정, 치료 및 수술 과정, 회복 및 퇴원과정)에 대한 분석결과에서는, 치료 및 수술 과정이 입원과정 단계와 함께 중국 환자의 신뢰를 향상시킬 수 있는 중요한 과정이라는 것을 보여준다. 또한, 본 연구에서는 서비스의 실패 방지를 위해 하위의 16가지 기준 사이에서 개선되어야 할 우선순위를 제안하고자 한다.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제25권1호
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• pp.21-45
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• 2011

본 연구는 4명의 중학교 3학년 학생들이 주어진 표적 문제를 해결하는 과정을 분석하여 학생들이 보이는 다양한 활동 요소 중 구조적 유사성의 인식, 분석적 활동 그리고 비교 활동에 주목하여 이들 활동이 표적 문제의 해결에서 어떤 역할을 하는지 살펴보았다. 4명의 학생들의 문제 해결 과정을 개별적으로 관찰하고 면담한 후, 이 과정에서 학생들이 보인 반응을 분석하여 다음과 같은 결과를 얻었다. 표적 문제의 해결에 근원 문제의 해법을 적용할 수 있는 토대를 마련하는데 도움을 주는 활동 중의 하나로 구조적 유사성의 인식이 그 역할을 수행할 수 있음을, 또 문제 해결을 위해 추측한 사실에 대한 진위 여부의 판단 근거로 분석적 활동을 활용함을 확인하였다. 그리고 표적 문제의 문제점을 인식하게 하여 표적 문제의 해결 방향을 설정하는데 도움을 제공하는 것으로 비교 활동을 활용함을 확인하였다. 따라서 현장에서 수학을 가르치는 교사는 표적 문제의 해결을 위해 유사 문제와의 구조적 유사성, 분석적 활동 그리고 비교 활동에 초점을 맞추어 문제의 해결을 지도하는 노력이 요구된다. 뿐 만 아나라 본 연구에서 언급한 세 가지 요소 이외에 더 많은 요소가 있을 수 있으며 그 요소들의 역할을 탐구하는 후속연구도 필요하다.

• 스마트미디어저널
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• 제12권1호
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• pp.77-91
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• 2023

사용자의 행위를 상호적인 탐색과정으로 활용하는 인터랙션 방식과 기술들이 다양하게 진화하고 있다. 특히 최근에는 각종 센서 기술의 발전으로 접촉에서 비접촉 방식으로 서비스 방식이 변화하고 있지만 인터랙션 방식에 대한 개발자들의 무분별한 정의로 인해 오히려 탐색과정이 복잡해지는 양상을 띄게 되었다. 이러한 방식은 오히려 사용자가 전시콘텐츠를 학습하기에 앞서 개발자가 정의한 인터랙션 가이드를 먼저 학습해야하는 번거로움을 야기하고 있다. 따라서 전시 체험자를 위한 원활한 문화콘텐츠 정보 소통을 위해서는 다양한 연령대의 사용자를 위한 손쉬운 인터랙션에 대한 사전 연구가 필요하며, 비접촉 전시콘텐츠 개발 시 사용자 상호작용의 사용편의성 제고를 위한 연구 역시 반드시 필요한 상황이다. 이에 따라 본 연구에서는 전시콘텐츠 분야에서 활용도가 높고 보편적 상호작용이 가능한 비접촉 인터랙션을 연구하고 행위(제스처) 디자인을 제안함으로써 개발자와 사용자의 혼란을 줄일 수 있는 방안을 모색하였다. 먼저 문화자원 서사구조를 기반으로 기존 연구들을 고찰하고 문화콘텐츠로써 인터랙션 지점을 도출하였으며 사용자가 인터랙션 방식을 자연스럽게 추측하고 학습할 수 있는 손짓 기반 비접촉 행위 중 가장 효율성이 높은 탐색과정을 선별하였다. 나아가 비선형 내러티브 기반 인터랙션의 의미와 공간적 행위 요소 분석결과를 바탕으로 학습적 효과와 효율성이 높은 어포던스 행위를 도출하였다. 본 연구과정을 통해 사용자가 전시형 문화콘텐츠 탐색활동 과정에서 자연스럽게 비접촉 인터랙션을 이해하고, 전시콘텐츠에 몰입하는 과정에서 비접촉 인터랙션을 활용하는데 도움이 되는 행위를 최종적인 모델로 제안하였다.

• 건축역사연구
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• 제23권4호
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• pp.35-46
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• 2014

The temple Hoeamsa(檜巖寺) was repaired by Naong(懶翁), and with this the power of the temple became far greater to be the greatest Buddhist temple during late Goryeo and early Joseon. Naong's reconstruction of Hoeamsa was originated from Jigong(指空)'s teaching 'Samsan Yangsu(三山兩水)'. But it is not clear whether Samsan Yangsu really meant Hoeamsa. By the way, after 14 years, Naong suddenly remembered this word and began to repair Hoeamsa in a large scale. From this, we can guess that Naong tried to give the contemporary Buddhism some change through the repair of Hoeamsa. But, as King Gongmin(恭愍王) the greatest supporter of Naong was suddenly assassinated, the political situation changed a lot and Naong also died unexpectedly. Naong's death brought out the critical sense to Hoeamsa and, in the process to resolve the crisis, the repair of Hoeamsa began to be justified through diverse religious factors. As these were expanded and developed on and one, Hoeamsa came to be honored as the most divine temple in Korea during the early Joseon dynasty. Furthermore, into the cause structure for the Naong's repair of Hoeamsa, the influence of Jajang was added through Odaesan Buddhism. As we can well understand, late Silla situation of Jajang and the late Goryeo of Naong were very similar and the both Buddhist leaders should have derived out some religious solution for them. In other words, both of them had a similar recognition in finding the religious solution for the contemporary crises. It becomes a way to understand the Hoeamsa repairing structure taken by Naong and his disciples. Therefore, by comparing the similar religious solution structures given by Jajang and Naong and by clearer understanding on Samsan Yangsu spirit, we can see the repair of Hoeamsa and the related aspects more accurately.

• 정보보호학회논문지
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• 제27권4호
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• pp.923-941
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• 2017

부채널 공격은 암호 장비의 물리적인 정보를 기반으로 내장된 암호 알고리즘을 공격하는 방법이다. 대표적인 부채널 공격 대응방법인 마스킹 기법은 암호 알고리즘의 라운드 중간 값에 임의의 마스킹 값을 연산하는 방법이다. 하지만 암호 알고리즘의 모든 라운드에 마스킹 연산이 적용되면 암호화 과정에 과부하가 발생 할 수 있다. 따라서 IoT(Internet of Things), 웨어러블 디바이스 등과 같은 경량 장비에는 마스킹 기법을 암호 알고리즘의 일부 라운드에만 적용하는 축소 마스킹 기법을 사용하는 것이 현실적이다. 본 논문에서는 축소 마스킹 기법이 적용된 SIMON 패밀리에 대한 해밍 웨이트 필터링을 이용한 공격 방법을 소개하고, 실제 프로그래밍을 통해 첫 라운드 키 복구가 가능함을 보인다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 1996년도 추계학술대회발표논문집; 고려대학교, 서울; 26 Oct. 1996
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• pp.103-112
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• 1996

Optimal pricing research in general has been focused on profit maximizing strategy under the given product life-time T. Here we have tried to study the effect of uncertain product life-time on dynamic optimal pricing strategy. In reality, the life-time of product is more likely to be uncertain and not known as well. In terms of approximating the model to the concerned reality, so-called model validity, it seems to be more desirable to consider the uncertainty of product life-time into the optimal pricing strategy model, For this purpose, we tried two different approaches. One is to consider diverse product life-time probability functions under fixed life-time T. In this case, we might have the same product life-time as the previous study, but the process could be different in the expectation of product's discontinuity. The other is that life-time itself is not determined and thus it is the situation in which we can only decide optimal price on incremental basis. The former is the situation in which although we got some strong guess on life-time of a certain product, the pattern of expected life-time probability could be different. The question is what could be optimal pricing strategies on such different product life-time situations. But since in the latter, we don't assume any idea on the life-time of product. proper optimal pricing could be derived only from the past prices and diffusion information. While the latter seems to be safer in the aspect of model assumption, the former could be more realistic because we might have more or less a prior knowledge on the product life-time itself.

• 건축역사연구
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• 제23권3호
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• pp.7-19
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• 2014

The temple Hoeamsa(檜巖寺) was repaired by Naong(懶翁), and with this the power of the temple became far greater to be the greatest Buddhist temple during late Goryeo and early Joseon. Naong's reconstruction of Hoeamsa was originated from Jigong(指空)'s teaching 'Samsan Yangsu(三山兩水).' But it is not clear whether Samsan Yangsu really meant Hoeamsa. By the way, after 14 years, Naong suddenly remembered this word and began to repair Hoeamsa in a large scale. From this, we can guess that Naong tried to give the contemporary Buddhism some change through the repair of Hoeamsa. But, as King Gongmin(恭愍王) the greatest supporter of Naong was suddenly assassinated, the political situation changed a lot and Naong also died unexpectedly. Naong's death brought out the critical sense to Hoeamsa and, in the process to resolve the crisis, the repair of Hoeamsa began to be justified through diverse religious factors. As these were expanded and developed on and one, Hoeamsa came to be honored as the most divine temple in Korea during the early Joseon dynasty. Furthermore, into the cause structure for the Naong's repair of Hoeamsa, the influence of Jajang was added through Odaesan Buddhism. As we can well understand, late Silla situation of Jajang and the late Goryeo of Naong were very similar and the both Buddhist leaders should have derived out some religious solution for them. In other words, both of them had a similar recognition in finding the religious solution for the contemporary crises. It becomes a way to understand the Hoeamsa repairing structure taken by Naong and his disciples. Therefore, by comparing the similar religious solution structures given by Jajang and Naong and by clearer understanding on Samsan Yangsu spirit, we can see the repair of Hoeamsa and the related aspects more accurately.

• International Journal of Reliability and Applications
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• 제7권1호
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• pp.27-39
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• 2006

Many real world cases in material failure analysis do not follow perfectly the normal distribution. Forcing of the normality assumption may lead to inaccurate predictions and poor product quality. We examine the failure process of the internal bond (IB or tensile strength) of medium density fiberboard (MDF). We propose a forced censoring technique that closer fits the lower tails of strength distributions and better estimates extremely smaller percentiles, which may be valuable to continuous quality improvement initiatives. Further analyses are performed to build an accelerated common-shaped Weibull model for different product types using the $JMP^{(R)}$ Survival and Reliability platform. In this paper, a forced censoring technique is implemented for the first time as a software module, using $JMP^{(R)}$ Scripting Language (JSL) to expedite data processing, which is crucial for real-time manufacturing settings. Also, we use JSL to automate the task of fitting an accelerated Weibull model and testing model homogeneity in the shape parameter. Finally, a package script is written to readily provide field engineers customized reporting for model visualization, parameter estimation, and percentile forecasting. Our approach may be more accurate for product conformance evaluation, plus help reduce the cost of destructive testing and data management due to reduced frequency of testing. It may also be valuable for preventing field failure and improved product safety even when destructive testing is not reduced by yielding higher precision intervals at the same confidence level.