• 정보학연구
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• 제4권1호
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• pp.39-54
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• 2001

본 논문에서는 웹브라우저를 이용하여 로봇을 원격 제어한다. 4대의 독립된 PC를 사용하여 각각의 기능을 분리하고 상호 연동하는 구조로 PC를 연결하였다. 조작자가 시간과 장소에 제약받지 않고 웹 브라우저를 이용하여 제어값을 입력하면 제어값은 웹 서버를 거쳐 데이터베이스에 저장된다. 로봇과 연결된 PC는 데이터베이스에서 1ms 간격으로 제어값을 입력받아 제어값의 변화가 있을 경우만 제어값의 변화량으로 로봇이 동작한다. 스텝모터를 이용하여 간단한 로봇을 제작하고 이를 웹 브라우저를 이용하여 실제 동작시킨다. 조작자가 원하는 제어값이 최종 수신단의 로봇에 제대로 전달되어 동작하는지 확인하고 웹브라우저를 이용한 로봇제어의 가능성을 확인하였다.

• 대한의용생체공학회:의공학회지
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• 제35권6호
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• pp.219-226
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• 2014

This study is to develop a basic life support (BLS) app using the android based smartphone and to evaluate the function of the app. Suggested app contains chest compression feedback function, the map of automated external defibrillator (AED), direct emergency call and the basic knowledge of BLS. Using the accelerometer of the smartphone, we implemented a real-time algorithm that estimates the chest compression depth and rate for high quality cardiopulmonary resuscitation (CPR). The accuracy of algorithm was evaluated by manikin experiment. We made contents which were easy to learn the BLS for the layperson and implemented a function that provides the AED location information based on the user's current location. From the manikin experiment, the chest compression depth and rate were no significant differences between the manikin data and the app's feedback data (p > 0.05). Developed BLS app was uploaded on Google Play Store and it was free to download. We expected that this app is useful to learn the BLS for the layperson.

• 한국인터넷방송통신학회논문지
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• 제17권6호
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• pp.187-193
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• 2017

본 논문은 성매매 금지법 이후 우후죽순으로 생겨난 기형적 유흥업소와 HIV/AIDS의 상관관계를 파악하기 위하여 인구밀도 대비 유흥업소의 수와, 감염자의 수치를 R 프로그램을 사용하여 시각화 하고, 어떠한 상관관계가 있는지 알아보도록 한다. 또한 상관관계를 통하여 어떠한 예상치 못한 변수가 작용하였고, 외부 요인으로 인하여 유흥업소 주변에 HIV/AIDS감염자들의 수치가 높은지에 대해 원인을 파악해 보도록 한다. 그리고 건전한 사회를 만들어가기 위하여 R을 통한 빅데이터 분석으로 우리가 지향해야할 목표와 자세에 대해 알아보도록 하고, 추후 더욱 연구가 필요한 부분에 관하여 논하기로 한다.

• 전력전자학회논문지
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• 제23권1호
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• pp.1-8
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• 2018

A problem exists in the conventional transportation cart applications, in which an external power supply with mechanical contact connection (bus bar connection) is required to drive the motor. Therefore, continuous effort for maintenance is required, aside from the expensive bus bar connector. To solve this problem, a self-electricity-generated transportation cart system without bus bar has recently been introduced. In this system, a battery needs to store the power of the generated wheel, and a boost converter, which converts the low battery voltage to high bus voltage to drive the motor inverter, is necessary. However, since the instantaneous large current required for starting the motor is supplied from the battery, a battery with large size and volume should be adopted to withstand this large current. In this study, a boost converter that can supply a large instantaneous current by using super Capacitor string is proposed. The proposed converter can be realized with a small size and volume compared with the conventional battery-fed boost converter. Operational principles, analysis, and design of the proposed converter are presented, and experimental results are provided to validate the proposed converter.

• 수산경영론집
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• 제33권2호
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• pp.153-168
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• 2002

Korea's marine products trade is taking for phase that income exceeds export after 2000. According to external environment change of Korea and Japan fishery agreement and an import liberalization of marine products, import of live fish and fresh fish is increasing rapidly. This study investigates import view of Japan live fish and fresh fish. Live fish which is imported from Japan has red seabream and seabass, but it is in declining tendency because of the increase in import of cheaper croaker from the China. If see importer's trend, entry to import business of fresh fish is eased a little. If a circulation trend is seen, However, it is thought that a future import trend is influenced by economic trends of Japan and the grade of place-of-production development of a domestic trader. Circulation market outside is common and the district wholesale store has played the important role. The import view of Japanese live fish and a fresh fish will increase against the background of maintenance of domestic circulation organization, and upgrading of marine product consumption However, it is thought that a future import trend is influenced by economic trends of Japan and the grade of place-of-production development of a domestic trader.

• 정보보호학회논문지
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• 제25권3호
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• pp.585-594
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• 2015

최근 데이터의 대용량화로 인해 스토리지 시장이 커짐에 따라 디지털 포렌식 관점에서 클라우드 및 USB, 외장 하드와 같은 저장 매체에 대한 연구가 꾸준히 진행되고 있다. 하지만 TB 단위 이상의 대용량 데이터 저장이 가능하며 기업용 저장 장치 뿐만 아니라 개인용 저장 장치로도 많이 사용되고 있는 NAS에 대한 연구는 부족한 실정이다. 본 논문에서는 NAS 제품 중 국내의 시장에서 점유율이 높은 소형 NAS 두 개, 대형 NAS에서 한 개의 제품을 선정하여 활성상태의 NAS에서 내부 데이터 수집을 위한 디지털 포렌식 조사 절차와 기법을 제안한다.

• 중소기업융합학회논문지
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• 제6권3호
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• pp.79-83
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• 2016

본 연구의 목적은 대학교 캠퍼스 내에서 공부하고 생활하는 학생들에게 개인별 맞춤형 정보를 제공하는 것을 목적으로 한다. 연구방법은 캠퍼스 내부에서 수집되는 데이터와 인터넷 상의 블로그나 SNS 등의 외부 데이터를 수집하여, 이를 저장하여 처리한 다음, 이들 데이터를 세부적으로 분석하여 학생 개인별로 일대일 마케팅을 제공하는 시스템을 제안한다. 학생 한 사람 한사람의 구매 이력과 해당 건물의 출결상황을 상세히 분석하여 패턴에 맞춰 학생개인별로 내용이 다른 쿠폰 및 정보를 학생의 휴대전화로 전송한다. 이를 통해 학생 개인별로 맞춤형 정보를 제공함으로써 보다 유익한 대학생활을 할 수 있을 것이다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제13권2호
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• pp.157-169
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• 2013

Scale Invariant Feature Transform (SIFT) generates image features widely used to match objects in different images. Previous work on hardware-based SIFT implementation requires excessive internal memory and hardware logic [1]. In this paper, a new hardware organization is proposed to implement SIFT with less memory and hardware cost than the previous work. To this end, a parallel Gaussian filter bank is adopted to eliminate the buffers that store intermediate results because parallel operations allow all intermediate results available at the same time. Furthermore, the processing order is changed from the raster-scan order to the block-by-block order so that the line buffer size storing the source image is also reduced. These techniques trade the reduction of memory size with a slight increase of the execution time and external memory bandwidth. As a result, the memory size is reduced by 94.4%. The proposed hardware for SIFT implementation includes the Descriptor generation block, which is omitted in the previous work [1]. The addition of the hardwired descriptor generation improves the computation speed by about 30 times when compared with the previous work.

• Journal of Communications and Networks
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• 제18권2호
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• pp.261-269
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• 2016

In this paper, the impact of energy constraints on a two-hop network with a source, a relay and a destination under random medium access is studied. A collision channel with erasures is considered, and the source and the relay nodes have energy harvesting capabilities and an unlimited battery to store the harvested energy. Additionally, the source and the relay node have external traffic arrivals and the relay forwards a fraction of the source node's traffic to the destination; the cooperation is performed at the network level. An inner and an outer bound of the stability region for a given transmission probability vector are obtained. Then, the closure of the inner and the outer bound is obtained separately and they turn out to be identical. This work is not only a step in connecting information theory and networking, by studying the maximum stable throughput region metric but also it taps the relatively unexplored and important domain of energy harvesting and assesses the effect of that on this important measure.

• 항공우주시스템공학회지
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• 제9권3호
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• pp.23-30
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• 2015

In this study, a transient structural load analysis system was constructed to calculate the applied load on the suspension equipment corresponding to the aircraft flight conditions based on military specifications. Aircraft flight data (altitude, velocity, acceleration, angle of attack and etc. at aircraft center of gravity) were used as input parameters and the calculated load of the suspension equipment at wings on the left and right side was printed out for the structural load analysis. As a calculation procedure, first of all, load analysis was carried out at the center of gravity of the external store, Secondly, a trial reaction force analysis was conducted on hook and swaybrace of suspension equipment. All procedure of calculations was programed to analyze the structural load automatically. To verify the numerical results, structural load analysis using the experimental flight data was performed.