• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.9
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• pp.821-828
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• 2012

Recently, in order to provide the mobile multimedia service cost-effectively, the user's demand has been greatly increasing to use wireless LAN (WLAN). But existing WLAN (Wireless LAN) is vulnerable to attack of outside, as users are connecting AP using Open Authentication. In this article, we have designed and implemented WLAN Information Sharing System using social network service (SNS) which is efficiently managing. WLAN secure key. A proposed WLAN Information Sharing System model has been proposed in which the social trust strength between people is employed for WLAN access control.

• Journal of the Korean Society of Safety
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• v.32 no.1
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• pp.66-74
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• 2017

Masonry walls which are commonly used for partitions in low-rise reinforced concrete (RC) structures, can be easily exposed to high risks under strong earthquakes. Since the strength degradations cannot be protected under the ground motions, their applications cannot be recommended for building structures which are designed to possess high seismic performances. However, masonry-infilled walls are typically considered as non-structural elements in evaluating the seismic performance of building structures. In order to figure out this problem, this study performed experiments using two specimens-only RC frame and RC frame infilled with masonry walls- under static loading. Also, the study established analytical models representing fully infilled frames and bare frame, and compared their structural behavior with test results. In addition, analytical model representing partially infilled frames was established and analyzed. Test results indicated that strength and energy dissipating capacity were increased for IW-RN(fully infilled frames) compared to the NW(bare frame). The nonlinear static analysis of the three specimens was also conducted using the inelastic plastic hinge frame element and diagonal strut models, and the analytical results successfully simulated the nonlinear behaviour of the specimens in accordance with the test results.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.6
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• pp.763-773
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• 2004

This paper suggests the 2 D.O.F mathematical model of the High Frequency Vibro-Hammer (HFVH), introduces an experimental method for measuring of the attenuation of piling vibration and proves what experiments are coincident with the equation of wave propagation. As vibratory installation of piles and casings has many economic merits in the construction field, most of all contractors prefer to vibratory pile driving method than the other. Compared to impact pile driving, vibratory installation has the advantage of reducing vibration or noise pollution and can drive piles under high frequency. Experiments serve estimations of capabilities and limitations of the HFVH's excitation force and finding of sensitivity for important soil resistance parameters. Also, we discuss the HFVH that can drive with three kinds of input waves (triangular, sine and square wave) and propose the design of parameters to improve actuating performance in it.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.277-282
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• 1997

최근 들어 웹 상의 문서를 번역해 주는 번역 시스템이 상용화되고 있다. 일반 문서와 달리 웹 문서는 HTML 태그를 포함하고 있어 번역 시스템에서 문장 단위로 분리하는데 어려움이 있다. 또한 그 대상 영역이 제한되지 않으므로 미등록어 및 구문 분석 실패에 대한 대처 기능이 필요하다. 따라서 웹 문서의 번역 품질이 일반 문서 번역에 비해 현저히 떨어지게 된다. 이 논문에서는 HTML 태그를 보유한 영어 웹 문서를 대상으로 하는 번역 시스템인 "에서로-웹/EK"에 대해 기술한다. 에서로-웹/EK는 HTML 문서의 특성을 고려하여 태그를 분리, 복원하는 태그 관리자를 별도로 가진다. 또한 태그를 유지하면서 영어에서 한국어로 변환되는 과정에서 발생하는 어휘 분리, 어휘 통합, 어순 변환 둥의 다양한 변환 현상을 처리한다. 이 시스템은 변환 방식에 기반한 번역 시스템으로서 영어 해석, 영한 변환, 한국어 생성의 단계를 거친다. 구현된 시스템은 Netscape와 DDE(Dynamic Data Exchange) 방식으로 연동하여 HTML 문서를 번역한다.

• Biotechnology and Bioprocess Engineering:BBE
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• v.9 no.4
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• pp.313-317
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• 2004

The nutritional requirements for Prevotella sp. 4PCCNB2 isolated from the rumen of a native goat in Korea and those of the ATCC 19189 strain isolated from the bovine rumen were investigated. The two strains grew well with ammonium sulfate as the sole added nitrogen source. However, neither a complex of amino acids nor casein hydrolysate effectively replaced ammonium sulfate. Biotin, p-aminobenzoic acid, and vitamin $B_12$ were essential to culture the ATCC 19189 strain. Unlike the ATCC 19189 strain, however, $B_12$ was only stimulatory for the growth of the 4PCCNB2 strain. The 4PCCNB2 strain grew well in the basal medium without an individual acid such as acetic acid or valeric acid. In contrast, either acetic or valeric acid was absolutely required for the growth of the ATCC 19189 strain.

• Korean Journal of Head & Neck Oncology
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• v.31 no.2
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• pp.74-77
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• 2015

A lingual thyroglossal duct cyst(LTGDC) is a rare congenital anomaly that account for only 0.5% to 2% of total thyroglossal duct cyst. LTGDC is frequently associated with respiratory problem in infants and pharyngeal foreign body sensation or dysphagia in adults. Because of its location and characteristics, lingual thyroid, dermoid cyst, and vallecular cyst should be included in differential diagnosis. Standard treatment for thyroglossal duct cyst is sistrunk's operation, but in terms of LTGDC, because of its location and cosmetic reasons, different kinds of treatments such as electrical cauterization, $CO_2$ laser, Robort surgery via transoral approach have been introduced. Recently authors encountered 21 years old woman with LTGDC and the mass was removed successfully via transoral approach using $CO_2$ laser. We report the clinical course with review of the literature.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.339-342
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• 2006

BPMN(Business Process Modeling Notation)은 BPMI(Business Process Management Initiative)에서 발표한 것으로서 비즈니스 프로세스 모델링을 위한 표준 표기법이다. BPMN은 표준 모델링 표기법 이므로 다른 모델링 표기법을 익히는데 사용되는 시간을 줄이며 IT 및 비즈니스 사용자들 간의 의사소통을 증진시킬 수 있다. 이에 대응하여 WfMC(The Workflow Management Coalition)는 XPDL 매핑작업을 시도하여 BPMN을 XPDL로 표현할 수 있도록 하였고, 그 결과 BPMN에 매핑시킨 XPDL2.0을 발표하였다. 본 논문에서 설계한 모델링 시스템은 표준 표기법인 BPMN을 통하여 모델링을 하고 그 결과를 국제 표준화 워크풀로우 정의 언어인 XPDL2.0으로 제공하는 워크플로우 모델링시스템을 제안하여 다른 워크플로우 시스템들과의 상호 호환성을 제공하는 것이며, 역할 기반의 모델링 방식으로 복잡한 모델링 작업을 단순화 시킬 수 있다. 즉, 워크플로우 모델링 기능에 실시간 그룹웨어 특성들을 통합하여, 한 차원 높은 수준의 모델링 환경제공을 통하여 기존의 워크플로우 시스템들이 지원하지 못 했던 워크플로우 모델링 협동 작업을 실시간으로 지원 할 수 있을 문만 아니라, 요즘과 같이 대형화와 복잡화 그리고 다양화의 특징을 갖는 조직들의 워크플로우 들에 대한 효율적인 분석 및 모델링 환경을 제공하기 위한 워크플로우 모델링 시스템을 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.9
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• pp.1895-1902
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• 2011

The soft-decision e-BCH decoding algorithm based on the Chase algorithm is adopted in DVB-RCS NG systems. For implementation, it is necessary to decide the number of optimal quantization bits when soft-decision e-BCH decoding algorithm is processed. Also, the performance must be satisfied. Therefore, in this paper, when the soft-decision e-BCH decoder is implemented, we select the number of optimal quantization bits using BER performance.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.10
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• pp.2207-2214
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• 2010

Underwater acoustic(UWA) communication has multipath error because of reflection by sea-level and sea-bottom. The multipath of UWA channel causes signal distortion and error floor. In this paper, we proposed split input bits of channel decoder using method of maximum value, average value, LLR value for optimal estimation. Channel coding method is LDPC(N size=16000) standard in DVB-S2. As shown in simulation results, the performance of LLR value method is better than other methods.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1597_1598
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• 2009

In this paper, the techniques and design focus of flexible gain coltrol of LAN(Low Noise Amplifier) using the TSMC 0.18um CMOS process. The design frequency set up a standard on 2.4GHz that is used in Zigbee system. The design concepts a basic Cascode LNA techniques and a swiching circuit consisted of 4 NMOS of load resistance, which convert the output impedenceby tuning on or off. The result show the gain change by NMOS operated swich. The simulation result is that Gain is 10.23~12.96dB and NF(Noise Figure) is 1.41~1.47dB.