• 한국컴퓨터정보학회논문지
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• 제14권10호
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• pp.101-110
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• 2009

6LoWPAN은 IEEE 802.15.4 MAC과 PHY 계층 위에서 IPv6 패킷을 전송하기 위해 IPv6 헤더 압축, TCP/UDP/ICMP 헤더 압축, 단편화 및 재조립 등을 수행하는 적응계층이다. 그러나 보안 관점에서 보면 기존 IP 계층에서 단편화 및 재조립으로 인한 보안 취약점을 그대로 가지고 있으며 6LoWPAN 적응계층 고유의 새로운 보안 취약점에 노출될 수 있다. 센서 노드는 특성상 재생공격으로 인해 단편화된 패킷의 재전송이 빈번하게 발생하게 되면 심각한 통신장애가 발생한다. 본 논문에서는 6LoWPAN 계층에서 패킷 단편화로 발생할 수 있는 보안 취약점을 분석하고 재생공격으로 인한 재전송을 최소화할 수 있는 메커니즘을 제안하였다. 6LoWPAN 표준을 기반으로 추가적인 재전송 절차 및 단편화 패킷 구조를 설계하고 재전송 지연시간을 분석하였다. 제안하는 메커니즘은 타임스템프, 난스, 체크섬을 도입하여 센서 노드에 가해질 수 있는 재생공격을 최소화한다. 이를 통해 불필요한 패킷 단편화 및 재조립을 제거함으로써 센서 노드의 재조합 버퍼 오버플로우, 통신 속도 저하, 컴퓨팅 자원 손실, 노드 재부팅 등을 최소화시켜 통신의 신뢰도를 높일 수 있다.

• Genomics & Informatics
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• 제6권2호
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• pp.87-90
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• 2008

During the last four years, the pyrosequencing-based 454 platform has rapidly displaced the traditional Sanger sequencing method due to its high throughput and cost effectiveness. Meanwhile, the Sanger sequencing methodology still provides the longest reads, and paired-end sequencing that is based on that chemistry offers an opportunity to ensure accurate assembly results. In this report, we describe an optimized approach for hybrid de novo genome assembly using pyrosequencing data and varying amounts of Sanger-type reads. 454 platform-derived contigs can be used as single non-breakable virtual reads or converted to simpler contigs that consist of editable, overlapping pseudoreads. These modified contigs maintain their integrity at the first jumpstarting assembly stage and are edited by fragmenting and rejoining. Pre-existing assembly software then can be applied for mixed assembly with 454-derived data and Sanger reads. An effective method for identifying genomic differences between reference and sample sequences in whole-genome resequencing procedures also is suggested.

• 한국국방경영분석학회지
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• 제3권1호
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• pp.97-107
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• 1977

This report examines several models, such as random or area bombardment, salvo fire and pattern fire, for the computation of target coverage when multiple rounds are fired at a target. Fractional kill of a fragment sensitive target by a fragmenting projectile as a function of the number of rounds fired is compared for two salvo fire models. The first is a standard salvo fire model in which N rounds are fired at the same aim point, in the second model single kill probability is computed for a fragment sensitive target and then fractional kill from the firing of N rounds is computed according to the assumption that the effects of each round are independent. Because the method of solution becomes very laborious for large patterns, this report gives a method only for the case of evaluating the effectiveness of stick and trianglar pattern fire. The need for the sophisticated and complicated target coverage models is demonstrated by the results of computations performed in this report.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2016년도 추계학술발표대회
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• pp.158-161
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• 2016

모바일 기기의 발전과 함께 다양한 어플리케이션의 기능이 제공되면서 전력에 대해 효율적인 관리가 필요해졌다. 효율적인 관리를 위하여 모바일 디바이스에서의 전력 소모 원인을 분석해야만 한다. 그러나 기존 연구에서 사용되었던 안드로이드 프레임워크의 수정을 통한 전력 분석 방법은 개발에 대한 용이성이 낮은 단점이 존재하고, 프로파일링을 통한 전력 분석 방법은 각 디바이스 모델에 의존적인 단점이 존재한다. 따라서 본 논문에서는 기존 연구들의 문제점을 개선하기 위해서 안드로이드 프레임워크를 수정하지 않고 획득할 수 있는 프로세스와 서비스의 목록 정보를 통해 어플리케이션이 소모하는 전력에 대한 분석을 제안한다. 본 논문에서 제안하는 방법을 GPS를 사용하는 어플리케이션을 분석하기 위해서 적용해보았다. 이를 통해 사용자는 측정된 전력과 함께 해당 전력을 사용하고 있는 프로세스 및 서비스 목록을 확인 할 수 있다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2021년도 제63차 동계학술대회논문집 29권1호
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• pp.165-167
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• 2021

본 논문은 노약자와 장애인의 편의를 도모하기 위하여 주기적으로 약을 복용해야하는 시간을 알려주는 시스템이다. 무게 센서를 사용하여 7일간 복용해야 하는 알약들의 전체 무게를 측정하고, 사용자가 알약을 복용하면 줄어든 알약의 무게를 다시 측정하여 복용 여부를 판단하는 시스템이다. 또한 알약을 복용하지 않은 사용자에게 이를 알려주기 위해 설정된 특정 시간에 다시 알려주는 작업을 수행하도록 구성하였다. 본 논문에서는 시뮬레이션을 통하여 이와 같은 시스템의 작업 수행 과정을 세분화하여 보여줌으로써 사용자들이 잊지 않고 약을 복용하는 것을 도와주고자 한다.

• 디지털융복합연구
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• 제11권8호
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• pp.31-39
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• 2013

최근 소셜미디어, 산업 간 융합 등이 확대되고, 기존의 PC뿐만 아니라 스마트폰, 태블릿 PC 등 다양한 스마트 기기를 통한 인터넷 이용이 증가하면서 수많은 비정형 데이터를 발생됨에 따라 빅 데이터 시스템에 대한 관심이 증가하고 있다. 시장조사 전문기관에서는 향후 5년에는 현재보다 데이터량이 9배가 증가할 것으로 전망하고 있으며, 빅 데이터 시장도 더 커질 것으로 예상하고 있다. 본 논문에서는 빅 데이터가 갖추어야할 효율성 품질평가 항목을 요구사항 분석을 통해서 도출하고 평가항목을 세분화하여 빅 데이터에 대한 효율성 시험 평가를 하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마연구회
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• pp.108-111
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• 2003

The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.

• 통상정보연구
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• 제7권2호
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• pp.163-181
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• 2005

The purpose of this paper is to review the major issues of trade facilitation that have been discussing in relevant international organization such as WTO, WCO, UN/ECE, and UNCTAD In recent years the term, trade facilitation, has become extremely popular and, therefore, applied to an ever-growing number of activities. Trade Facilitation encompasses the simplification, standardization, harmonization and elimination of the procedures, data requirements and administration involved in an international trade transaction. The facilitation of trade procedures is seen by all major international business as vital for economic development. Several factors are fuelling the need for trade facilitation of which two are the globalization of international trade and the rapid IT-development. Another important factor includes increased economic integration by an explosion of regional and bilateral free-trade agreement that often feature complex customs requirements. Technological progress has also introduced faster and cheaper forms of transportation and transportation management techniques, such as the increased use of e-business and JIT. The Internet is also fragmenting containers of goods that could have been custom cleared on a single entry into dozens of individual shipments that each require separate customs documents and clearance procedures. This creates a challenge for express couriers who anticipate exponential growth in small shipments by individual consumers, as compared to shipment by wholesalers or retailers. These consumers expect goods to be cleared immediately. It is no wonder that express couriers are actively promoting, and participating in the trade facilitation agenda.

• 한국의류학회지
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• 제28권11호
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• pp.1415-1425
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• 2004

The purpose of this study was to analyze a theoretical frame of expressional area, the characteristics and the effects which is applied to fashion illustration by metonymic theory. The theoretical frame of expressional area was analyzed by category analysis and 150 fashion illustrations from 1900 to 1999 were analyzed by contents analysis. The results of this study were as follows: The expressions of metonymy were categorized by close-up, realistic expression, omission, borrowing of past style, simplification and deconstruction. First, close-up was presented as emphasis of small part of fashion by cutting the scenes, snapshot, emphasis, etc. Second, realistic expression was presented as description of related circumstance with fashion message through perspective and realistic description of circumstance related to figures. Third, omission was presented as seeking of essential core by removing color, pattern, texture or by omitting body and as emphasis of communication about dominant fashion message. Fourth, borrowing of past style was presented as reminding us of background of the past. Fifth, simplification was presented as using of form or color to alleviate tension of object and to restore the essential reality. Sixth, deconstruction was presented as fragmenting of image, flattening of body and clothing, weakness of form, and strength of color. In conclusion, metonymy made by experience system of thinking based on the reality, have extended expressional territory in pre-existing fashion illustration. And these ways not only will provide fashion image as illustrator's subjective intention and theoretical system of expression of message, but also will be useful way to strengthen communication for easier interpretation of fashion illustration.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 춘계학술대회 논문집
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• pp.175-179
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• 2005

The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.