• 국제초고층학회논문집
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• 제1권4호
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• pp.271-281
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• 2012

Tianjin Goldin Finance 117 tower has an architectural height of 597 m, total of 117 stories, and the coronation of having the highest structural roof of all the buildings under construction in China. Structural height-width ratio is approximately 9.5, exceeding the existing regulation code significantly. In order to satisfy earthquake and wind-resisting requirements, a structure consisting of a perimeter frame composed of mega composite columns, mega braces and transfer trusses and reinforced concrete core containing composite steel plate wall is adopted. Complemented by some of the new requirements from the latest Chinese building seismic design codes, design of the super high-rise building in high-intensity seismic area exhibits a number of new features and solutions to professional requirements in response spectrum selection, overall stiffness control, material and component type selection, seismic performance based design, mega-column design, anti-collapse and stability analysis as well as elastic-plastic time-history analysis. Furthermore, under the prerequisite of economic viability and a series of technical requirements prescribed by the expert review panel for high-rise buildings exceeding code limits, the design manages to overcome various structural challenges and realizes the intentions of the architect and the client.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권8호
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• pp.2157-2169
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• 2023

In order to handle the problem that puncture patterns will change the position distribution of original information bits and frozen bits in polar codes, which affects performance of puncture polar codes further, a minimum row weight and polar spectrum based puncture polar codes construction algorithm (called PA-MRWP) is proposed in this paper. The algorithm calculates row weight of generator matrix and sorts the row weight in ascending order first. Next, the positions with the minimum row weight are selected as initial puncture positions. If the rows with the same row weight cannot all be punctured, polar spectrum based auxiliary puncture scheme is used. In sub-channels with the same row weight, rows corresponding to the polarized sub-channels with higher reliability are selected as puncture positions to construct puncture vector, and the reliability is calculated based on polar spectrum. It is actually a two-step selection strategy, the proposed minimum row weight puncture (MRWP) algorithm is used for primary selection and polar spectrum based auxiliary puncture is used for adjustment. Simulation results show that, compared with worst quality puncture (WQP) algorithm, the proposed PA-MRWP algorithm and Gaussian approximation-aided minimum row weight puncture (GA-MRWP) algorithm provide gains of about 0.46 dB and 0.29 dB at bit error rate (BER) of 10^-4, respectively when code length N=400, code rate R=1/2. In addition, the proposed puncture algorithms improve the BER performance significantly with respect to quasi-uniform puncture (QUP) algorithm.

• 영어어문교육
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• 제17권3호
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• pp.99-118
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• 2011

Research on strategic Code-Switching (CS) of second language learners in teaching English in English (TEE) program provides an elaborate framework for analyzing how learners manage to express themselves in spite of their limited knowledge of the target language. This research presupposes that L2 learners' CS presents innovative solutions for communicative strategy, and that CS used as communicative strategy can promote L2 learners' language acquisition. The major questions of current research involve examining the significant patterns of different functions of CS in L2 learners' interaction and investigating L2 learners' CS styles according to the different functions of CS. The implication of CS utility is regarded as a teaching technique in the TEE program. Recorded transcript is analyzed to trace the same pattern and the categorization of CS as well as to recognize the functions of CS and their ratio. Hence, this leads to the conclusion that learners' negotiation between code selection and communication intention occurs in patterns. The learners' CS tends to be predictable, reproductive, and systematic, as one of the language acquisition phases. Therefore, the attention to the CS in the TEE program should be redirected in communication substantiality toward the principles of pragmatics. As an additional advantage of the CS analysis, this research elaborates on a conceptual acceptance of CS as a set of learners' strategies in the TEE program.

• 한국통신학회논문지
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• 제40권9호
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• pp.1667-1671
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• 2015

멀티레벨 홀로그래픽 데이터 저장장치는 한 픽셀에 1비트 이상의 데이터 저장이 가능하여 한정된 공간에서 저장 밀도를 높일 수 있기 때문에 차세대 대용량 저장장치로 부각되고 있다. 한편 레벨의 증가는 동일한 픽셀개수에서 코드워드의 수를 증가시킬 수 있기 때문에 적절히 코드워드를 선택하면 변조부호의 최소거리를 증가시킬 수 있다. 최소거리의 증가는 노이즈 마진이 증가하므로 변조부호의 오류 정정 능력이 향상된다. 본 논문에서는 부호율이 1인 세 가지 변조부호를 제안하고, 이들의 최소거리에 따른 성능을 비교한다. 레벨의 증가로 코드워드간의 최소거리를 증가시켜 노이즈 마진을 증가시켰지만, 픽셀의 레벨이 증가할수록 문턱값 검출이 어렵기 때문에 낮은 레벨에 대한 변조부호가 더 좋은 성능을 보였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권1호
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• pp.454-475
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• 2018

This paper presents a novel Android malware classification model planned to classify and categorize Android malicious code at Drebin dataset. The amount of malicious mobile application targeting Android based smartphones has increased rapidly. In this paper, Restricted Boltzmann Machine and Deep Belief Network are used to classify malware into families of Android application. A texture-fingerprint based approach is proposed to extract or detect the feature of malware content. A malware has a unique "image texture" in feature spatial relations. The method uses information on texture image extracted from malicious or benign code, which are mapped to uncompressed gray-scale according to the texture image-based approach. By studying and extracting the implicit features of the API call from a large number of training samples, we get the original dynamic activity features sets. In order to improve the accuracy of classification algorithm on the features selection, on the basis of which, it combines the implicit features of the texture image and API call in malicious code, to train Restricted Boltzmann Machine and Back Propagation. In an evaluation with different malware and benign samples, the experimental results suggest that the usability of this method---using Deep Belief Network to classify Android malware by their texture images and API calls, it detects more than 94% of the malware with few false alarms. Which is higher than shallow machine learning algorithm clearly.

• 한국의류산업학회지
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• 제6권3호
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• pp.285-296
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• 2004

Fashion business must reflect the seasonable fashion trend because fashion has change always, and therefore fashion business has a big risk at the attribute. Careful consideration should be given to the selection of a particular color code to meet the purpose of marketing research in various color products. It must be designed to grasp systematically and comprehensively the current trend of colors. The most suitable color code for meeting this proposition would be one based on the designation by color ranges. The ISCC-NBS method of designating colors, published in 1955, was established by dividing the color solid into 267 color name blocks. The detailed classification like the ISCC-NBS system is very appropriate to serve the purpose of giving all color names according to color ranges. But it is somewhat too complicated to answer the purpose of surveying the trend of colors and of comparing and evaluating the ups and downs in the popularity of the range of each individual color. I have worked out the most convenient method of designating colors in accordance with the type of investigation needed. It is the classification which involves four classification system in itself, fundamental, gross, medium, and minute. The fundamental classification system classifies hues and neutrals into 16ranges. The gross classification system divides the above 16 ranges into 30. The medium classification divides the above 30 ranges into 103 in terms of tones. The minute classification divides the above 103 ranges into 207 in terms of specipic hues.

• 한국통신학회논문지
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• 제40권8호
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• pp.1469-1476
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• 2015

본 논문은 원형배열 안테나를 사용하는 무선 메쉬 네트워크 환경에서 코드북을 이용한 다중 섹터 빔 형성시 섹터간 SIR 향상 빔 선택 알고리즘을 제안한다. 제안된 빔 선택 알고리즘은 피드백 되는 코드북 인덱스 조합에 따라 상호간 SIR을 향상시키는 빔 선택방법과 QoS를 보장하는 방법에 관한 내용이다. 전산 모의 실험을 통해 노드들이 섹터경계에 있을 경우 제안한 방법이 기존의 코드북 선택 방법보다 SIR이 4.42dB 우수함을 보였다. QoS를 위해 PF를 적용할 경우 기존보다 SIR이 1.70dB만큼 향상됨을 보였고 사용자간 QoS도 만족시킴을 보였다.

• Nuclear Engineering and Technology
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• 제45권7호
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• pp.951-960
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• 2013

Energy group structure has a significant effect on the results of multigroup transport calculations. It is known that $UO_2-PuO_2$ (MOX) is a recently developed fuel which consumes recycled plutonium. For such fuel which contains various resonant nuclides, the selection of energy group structure is more crucial comparing to the $UO_2$ fuels. In this paper, in order to improve the accuracy of the integral results in MOX thermal lattices calculated by WIMSD-5B code, a swarm intelligence method is employed to optimize the energy group structure of WIMS library. In this process, the NJOY code system is used to generate the 69 group cross sections of WIMS code for the specified energy structure. In addition, the multiplication factor and spectral indices are compared against the results of continuous energy MCNP-4C code for evaluating the energy group structure. Calculations performed in four different types of $H_2O$ moderated $UO_2-PuO_2$ (MOX) lattices show that the optimized energy structure obtains more accurate results in comparison with the WIMS original structure.

• 문화기술의 융합
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• 제5권1호
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• pp.395-399
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• 2019

다양한 병렬 컴퓨팅 시스템을 지원하기 위해서는 LLVM IR을 벡터/행렬을 보다 효과적으로 지원할 수 있도록 확장하는 것과 LLVM IR을 machine code로 바꾸어 주는 부분을 새로운 알고리즘으로 설계하여 구현하면 된다. IR 예제에서 보았듯이 기본적으로 RISC 명령어로 구성되어 있기 때문에 RISC 명령어 생성은 자연스럽게 생성되며, 벡터 또한 현재 지원가능한데 행렬 명령어는 지원되지 못하고 있다. 벡터/행렬을 보다 강력하게 지원하기 위한 새로운 IR 구조, 명령어 생성 알고리즘 및 관련 부분의 확장이 필요하다. 이를 위해 LLVM IR의 각 명령어를 (벡터/행렬을 위한) target architecture의 적당한 명령어로 mapping을 해주는 부분 (instruction selection 알고리즘)이 중요하다. LLVM IR 명령어의 의미를 파악하고, target architecture의 각 명령어 의미와 syntax를 비교하여, 패턴이 일치하는 명령어를 선택하여 mapping을 효율적으로 해줘야 한다.

• 대한전자공학회논문지TC
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• 제44권7호통권361호
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• pp.59-69
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• 2007

본 논문에서는 미래형 이동통신 시스템에서 셀 경계와 같이 반송파대간섭전력비 (Carrier-to-Interference Ratio; CIR)가 낮은 열악한 채널 환경에서 하향링크 실시간 트래픽의 전송 성능 개선을 위한 안테나 선택을 이용한 Grassmannian Beamforming 기반의 MIMO-OFDMA (Multi Input Multi Output-Orthogonal Frequency Division Multiple Access) 시스템을 본 저자들은 제안하고자 한다. 제안된 시스템에서는 Beamforming 적용으로 인한 상향링크로의 과도한 궤환 정보량이 시스템 주파수 효율 성능을 떨어뜨리는 문제점을 보완하기 위해 Codebook 기반의 Grassmannian Beamforming을 적용하고, 이와 더불어 기지국의 모든 송신 안테나를 사용하지 않고 특정 안테나만을 사용하여 Codebook Size를 줄이면서도 주파수 효율 성능을 향상시킬 수 있는 안테나 선택 기법을 제안한다. 제안된 시스템에서는 Beamforming을 수행하기 위해 최대 MRT(Maximum Ratio Transmission) 이득을 가지는 최적의 송신 안테나 조합이 선택된다. 모의실험 결과, 제안된 시스템은 기지국의 모든 안테나를 사용하여 Beamforming을 수행한 경우보다 향상된 주파수 효율 성능을 보이며, 상향링크의 궤환 정보량을 감안하더라도 Pseudo-Orthogonal Space Time Block Code를 사용하는 전형적인 개방루프형 MIMO-OFDMA 시스템에 비해 낮은 CIR 영역에서 월등히 개선된 주파수 효율 성능을 보임을 확인하였다.