• 전자공학회논문지
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• 제49권11호
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• pp.3-8
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• 2012

2차원 곱 부호는 저장장치 시스템에서 연집 오류를 정정하기 위해 연구되었다. RS-LDPC 곱 부호는 횡 방향의 RS 부호와 종 방향의 LDPC 부호로 이루어져 있다. 먼저 횡 방향의 RS 부호를 이용하여 연집 오류를 검출하며, 이 연집 오류의 위치 정보를 활용하여 종 방향의 LDPC 부호로 오류를 정정한다. 저장장치에서는 여러 가지 요인에 의해 연집 오류가 발생할 수 있다. 따라서 저장장치 시스템에서는 연집 오류에 강한 부호가 필요하다. RS-LDPC 곱 부호는 연집 오류에 강하다. 하지만 저장 밀도가 커지면서 연집 오류의 길이는 더 길어지게 된다. 따라서 본 논문에서는 긴 연집 오류에도 강한 특성을 보이는 LDPC-LDPC 곱 부호를 제안한다. 또한, RS-LDPC 곱 부호와 비교하여 LDPC-LDPC 곱 부호는 횡 방향으로 LDPC 부호를 사용하여 많은 램덤 오류가 발생 하였을 때 안정적인 성능 이득이 있다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1999년도 학술대회논문집-국제 전기방전 및 플라즈마 심포지엄 Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electrical Discharge and Plasma
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• pp.58-63
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• 1999

In order to analyze the discharge-pumped KrF excimer laser, computer simulation code is developed. On the other hand, the electron velocity distribution in a discharge plasma, measured by the Thomson scattering method, showed the Maxwellian, while the code predicted non-Maxwellian. This disagreement was solved by introducing the electron-electron collision into the simulation code. We also developed a simulation code on the CO2 laser-heated plasma in high-pressure Ar gas, and estimated the formation process of Ar2 excimer. The code predicted the possibility of the Ar2 laser action at 126 nm.

• Nuclear Engineering and Technology
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• 제42권5호
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• pp.500-519
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• 2010

AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.

• Nuclear Engineering and Technology
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• 제45권5호
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• pp.665-674
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• 2013

This paper presents the development and validation methods of the FUTURE (FUel cycle analysis Tool for nUcleaR Energy) code, which was developed for a dynamic material flow evaluation and economic analysis of the nuclear fuel cycle. This code enables an evaluation of a nuclear material flow and its economy for diverse nuclear fuel cycles based on a predictable scenario. The most notable virtue of this FUTURE code, which was developed using C# and MICROSOFT SQL DBMS, is that a program user can design a nuclear fuel cycle process easily using a standard process on the canvas screen through a drag-and-drop method. From the user's point of view, this code is very easy to use thanks to its high flexibility. In addition, the new code also enables the maintenance of data integrity by constructing a database environment of the results of the nuclear fuel cycle analyses.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.999-1000
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• 2006

The LDPC Code is focusing a powerful FEC(Forward Error Correction) codes for 4G Mobile Communication system. LDPC codes are used minimizing channel errors by modeling AWGN Channel as VDSL system. The performance of LDPC code is better than that of turbo code in long code word on iterative decoding algorithm. LDPC code are encoded by sparse parity check matrix. there are decoding algorithms for a LDPC code, Bit Flipping, Message passing, Sum-Product. Because LDPC Codes use low density parity bit, mathematical complexity is low and relating processing time becomes shorten.

• Steel and Composite Structures
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• 제5권5호
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• pp.395-405
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• 2005

This work introduces to the international scientific community the Chinese Code on fire safety design of steel building structures. The aim of the Code is to prevent the structure of a steel building subjected to fire from collapsing, ensure safe evacuation of building occupants, and reduce the cost for repairing the damages of the structure caused by fire. The main contents of the Code is presented in this paper, including the fire duration requirements of structural components, fundamental requirements on fire safety design of steel components, temperature increasing of atmosphere and components in fire, loading effect and capacity of various components in fire, and procedure for fire-resistant design of steel components. The analytical approach is employed in the Code and the effectiveness of the Code is validated through experiments.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.566-571
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• 2006

The purpose of this code is to relate the various controllable factors to the comfort and well-being of the people using the building, so that the requirements of the system may be specified to the designers and the constructor. This study deals with the work involved in design and installation of residential mechanical ventilation. The recommendations made in this code recognize the need to optimize the use of energy, reduce hazards and minimize effects detrimental to the environment. This code was prepared by a committee convened by SAREK. The code provides broad guidance only on certain topics. The titles of standard and code referred to in this code are listed on the reference.

• 한국CDE학회논문집
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• 제21권3호
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• pp.313-324
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• 2016

As building information modeling (BIM) is expanding its influence in various fields of architecture, engineering, construction and facility management (AEC-FM) industry, BIM-based automated code compliance checking has become possible prospects. For the automated code compliance checking, requirements in building code need to be processed into explicit representation that enables automated reasoning. This paper aims to develop high-level methods that translate verb phrases into explicit representation. The high-level methods represent conditions, properties, and related actions of the building objects and clarify the core content of the constraints. The authors analyze building permit requirements in Korea Building Code and establish a standardized process of deriving the high-level methods. As a result, 60 kinds of the high-level methods were derived. In addition, method classification, analysis, and application are introduced. This study will contribute to the representation of explicit building code sentences and establishment of the automated building permit system of Korea.

• 한국멀티미디어학회논문지
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• 제20권11호
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• pp.1759-1767
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• 2017

Although Open API has been invigorated by advancements in the software industry, diverse types of malicious code have also increased. Thus, many studies have been carried out to discriminate the behaviors of malicious code based on API data, and to determine whether malicious code is included in a specific executable file. Existing methods detect malicious code by analyzing signature data, which requires a long time to detect mutated malicious code and has a high false detection rate. Accordingly, in this paper, we propose a method that analyzes and detects malicious code using association rule mining and an Naive Bayes classification. The proposed method reduces the false detection rate by mining the rules of malicious and normal code APIs in the PE file and grouping patterns using the DHP(Direct Hashing and Pruning) algorithm, and classifies malicious and normal files using the Naive Bayes.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.774-777
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• 2005

본 논문에서는 HDR-WPAN 시스템의 성능개선 방안으로 터보코드를 적용하여 실내 무선채널 환경에서 그 성능을 분석하였다. 터보코드는 반복 횟수의 증가에 따라 복호 지연 및 연산량의 증가를 가져오지만, 이론적 한계치에 근접하는 우수한 성능을 보이는 오류 정정 부호화 기법이다. HDR-WPAN 시스템에 터보코드를 적용하였을 경우 실내 무선 채널환경에서 기존 시스템보다 10$^{-4}$의 BER(bit error rate)에서 최대 5.8dB의 E$_b$/N$_o$의 이득을 가졌다. 시뮬레이션의 결과를 통해 HDR-WPAN 시스템에 터보코드를 적용하였을 경우 적은 전력으로 신뢰성 있는 통신을 할 수 있음을 확인하였다.