• Journal of the Korean Institute of Telematics and Electronics C
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• v.35C no.12
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• pp.1-12
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• 1998

In this paper, a design and implementation of VHDL-to-C mapping in the VHDL compiler back-end is described. The analyzed data in an intermediate format(IF), produced by the compiler front-end, is transformed into a C-code model of VHDL semantics by the VHDL-to-C mapper. The C-code model for VHDL semantics is based on a functional template, including declaration, elaboration, initialization and execution parts. The mapping is carried out by utilizing C mapping templates of 129 types classified by mapping units and functional semantics, and iterative algorithms, which are combined with terminal information, to produce C codes. In order to generate the C program, the C codes are output to the functional template either directly or by combining the higher mapping result with intermediate mapping codes in the data queue. In experiments, it is shown that the VHDL-to-C mapper could completely deal with the VHDL analyzed programs from the compiler front-end, which deal with about 96% of major VHDL syntactic programs in the Validation Suite. As for the performance, it is found that the code size of VHDL-to-C is less than that of interpreter and worse than direct code compiler of which generated code is increased more rapidly with the size of VHDL design, and that the VHDL-to-C timing overhead is needed to be improved by the optimized implementation of mapping mechanism.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.154-156
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• 2003

모바일 기술의 발달로 인해 모바일 장치를 위한 다양한 지원 모델과 응용 프로그램들이 개발되고 있다. GIS분야에서도 모바일 기술이 접목되어 모바일GIS가 등장하게 되었으며, 모바일GIS를 이용한 다양한 응용 프로그램들이 서비스되고 있다. 기존의 모바일GIS는 국립지리원에서 제공하는 DXF형식의 국가기본수치지도를 원시 데이터로 사용하였으나, 최근에는 모바일GIS에 XML(extensible Markup Language)을 적응하려는 움직임을 보이고 있다. 이를 위해서는 DXF형식의 GIS데이터를 OGC(Open Gis Consortium)에서 제안한 GML(Geography Markup Language)로 변환하기 위한 변환기를 필요로 한다. 본 논문에서는 DXF를 GML로 변환하기 위한 DXF2GML변환기의 효율적인 번역을 위해, DXF와 GML의 의미적 차이를 해결하고 효율적인 변환과정을 구현하기 위한 DXF2GML변환기의 중간코드를 제안하고자 한다. 또한 제안된 중간코드를 적용하여 DXF2GML변환기의 Front-End인 중간코드 생성기와 Back-End인 GML문서 생성기를 구현하고자 한다.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.1141-1144
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• 2003

For proper communication with various types of IC-Card, multiple IC-Card interface complying with the IC-Card standard (ISO7816) is embedded and realized as a peripheral on the 32-bit RISC based system-on-a-chip. It provides the generation of either 3.3V or 5V power supply for the operation of the inserted IC-Card as well. IC-Card interface is divided into an analog front-end (AFE) and a digital back-end (DBE). The embedded DC-DC converters suitable for driving IC-Cards are incorporated in the AFE. The chip design for multiple IC-Card interface is implemented on a standard 0.35${\mu}{\textrm}{m}$ triple-metal double-poly CMOS process and is packaged in a 352-pin plastic ball grid array (PBGA). The total gate count is about 400,000, excluding the internal memory. Die area is 7890${\mu}{\textrm}{m}$ $\times$ 7890${\mu}{\textrm}{m}$.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.12
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• pp.220-228
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• 1995

An optimized 4-stage 12-bit pipelined CMOS analog-to-digital converter (ADC) architecture is proposed to obtain high linearity and high yield. The ADC based on a multiplying digital-to-analog converter (MDAC) selectively employs a binary-weighted-capacitor (BWC) array in the front-end stage and a unit-capacitor (UC) array in the back-end stages to improve integral nonlinearity (INL) and differential nonlinearity (DNL) simultaneously whil maintaining high yield. A digital-domain nonlinear error calibration technique is applied in the first stage of the ADC to improve its accuracy to 12-bit level. The largest DNL error in the mid-point code of the ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is simulated to prove the effectiveness of the proposed ADC architecture.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.660-662
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• 2000

오늘날 네트웍의 발달로 인하여 사용자가 원하는 영상매체를 실시간으로 요구하는 멀티미디어 서비스에 대한 사용자의 요구가 날로 증가하고 있다. 때문에 영상매체를 제공하는 서버는 여러 사용자들이 동시에 접속하였을 때 서비스를 제공 할 수 있는 능력을 가져야 한다. 본 논문에서는 멀티미디어 서비스를 위한 VOD(Video-On-Demand)시스템을 설계 및 구현한다. VOD 시스템은 미디어를 분석하여 BES(Back-End-Server)에 저장하는 영화 관리자(Movie Manager), 분산 저장된 데이터를 읽어 들여 사용자나 연결된 FES(Front-End Server)로 보내는 BES, 사용자에게 미디어 데이트를 전송하는 FES와 전송된 데이트를 받아서 재생하는 클라이언트(Client)를 구성된다. 또한 다수의 서버를 연결하기 위하여 SCI(Scalabel Coherent Interface)를 이용한 효율적인 메시지 전송방법을 구현한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.31-34
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• 2018

We live in the digital era, and the characteristics of our customers in the digital era are constantly changing. That's why understanding business requirements and converting them to technical requirements is essential, and you have to understand the data model behind the business layout. Moreover, BI(Business Intelligence) is at the crux of revolutionizing enterprise to minimize losses and maximize profits. In this paper, we have described a leading study about the situation of desk-top BI(software product & programming language) in aspect of front-end side and the Data Lake platform based on Big Data by data modeling in aspect of back-end side to support the business intelligence.

• Industrial Engineering and Management Systems
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• v.14 no.2
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• pp.159-174
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• 2015

Remanufacturing used, end-of-life products is a complex problem involving multiple types of products that may share common parts. Recovery targets assigned by market demand and environmental legislation add more difficulty to the problem. Manufacturers now need to achieve specified take-back and recovery rates while fulfilling demands for remanufactured products. To assists in the demand- and legislation-driven remanufacturing of a family of products (i.e., multiple products that share common parts), this paper introduces a bi-objective mixed integer linear programming (MILP) model for optimizing remanufacturing. The model identifies optimal remanufacturing plans for a product family, whereby, the remanufacturer can achieve demand and recovery targets more profitably and in an environmentally-friendly manner. The model can also be used to quantify and justify the economic and environmental benefits of a product family from a remanufacturing perspective. A case study is presented for remanufacturing an alternatorfamily of products.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.643-645
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• 2004

네트워크가 복잡해지면서 다양한 형태의 위험에 노출된다. 일반적인 보안 솔루션으로 사용하는 방화벽(Firewall)이나 침입탐지시스템(IDS)은 허가받지 않은 외부의 접속이나 알려진 공격만을 차단하는 단순하고 수동적인 시스템이다. 이에 반해 허니팟은 웹서버와 같은 실제 Front-End 시스템과 유사하거나, 밀접한 관련을 갖고 직접적으로 반응하므로 신뢰성 높은 실시간 정보를 얻을 수 있어서 관리자가 다양한 위협에 능동적이고 효과적으로 대응할 수 있다. 실제로 웜이나 DRDoS(Distributed Reflection DoS)등 수분만에 네트워크를 점유하는 자동화 공격과 함께 시스템 구성 취약점을 파고들거나 계정 획득을 통한 DB서버 등의 Back-End 시스템에 대한 수동 공격이 혼재한다. 따라서 시스템 전반적인 관리의 중요성이 강조되고 있다. 본 논문에서는 그간의 실험결과를 바탕으로 가상 머신으로 허니팟을 구성하고 특성별로 포트를 분리하여 관리하는 허니넷을 제안하고자 한다 이를 통해 1) 유연한 보안 시스템 구성이 가능하고 2) 관리 효율이 높아지며 3) 하드웨어 도입 비용 절감을 통해 시스템의 TCO(Totai Cost of Ownership)를 감소시키는 효과를 기대할 수 있다.

• Journal of Korean Physical Therapy Science
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• v.29 no.2
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• pp.38-47
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• 2022

Background: The purpose of this study was to investigate the effect of the combined application of manipulation and stabilization exercises on pain and spinal curvature in patients with chronic back pain. Design: Randomized controlled trial Methods: The research subjects included 24 women in their 40s and 50s who have chronic back pain. The sample was evenly divided into an experimental group, which received the combined application of manipulation and stabilization exercises, and a control group, which received stabilization exercises only. The 30-minute intervention was applied five times a week for eight weeks. A bivariate repeated measures analysis of variances was conducted to identify the differences between the two groups before the experiment, after the fourth week, and at the end of the eight-week experiment. The level of statistical significance was set at.05. This analysis examined the within-group changes and the between-group changes using a paired t-test and an independent t-test, respectively. Results: Changes in pain differed significantly depending on the time of the measurement, the interaction between the time of the measurement and each group, and between the two groups (p<.05). Changes in the curvature of the bones of the neck, the bones of the back, and the lumbar vertebrae differed significantly depending on the time of the measurement and the interaction between the time of the measurement and each group (p<.05). Conclusion: The combined application of manipulation and stabilization exercises demonstrated a positive effect on changes in pain and spinal curvature, and the method is expected to be a useful intervention for reducing pain and improving spinal curvature in patients with back pain.

• Geomechanics and Engineering
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• v.37 no.1
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• pp.31-48
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• 2024

To stabilize the excavations in urban area, soil anchorage is among the very common methods in geotechnical engineering. A more efficient deformation analysis can potentially lead to cost-effective and safer designs. To this end, a total of 116 three-dimensional (3D) finite element (FE) models of a deep excavation supported by tie-back wall system were analyzed in this study. An initial validation was conducted through examination of the results against the Texas A&M excavation cases. After the validation step, an extensive parametric study was carried out to cover significant design parameters of tie-back wall system in deep excavations. The numerical results indicated that the maximum horizontal displacement values of the wall (δ_hm) and maximum surface settlement (δ_vm) increase by an increase in the value of ground anchors inclination relative to the horizon. Additionally, a change in the wall embedment depth was found to be contributing more to δ_vm than to δ_hm. Based on the 3D FE analysis results, two simple equations are proposed to estimate excavation deformations for different scenarios in which the geometric configuration parameters are taken into account. The model proposed in this study can help the engineers to have a better understanding of the behavior of such systems.