• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.173-176
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• 2009

We suggest a new protective layer for PDP consists of SrO and MgO double layer. This double layer structure protects SrO layer from the contamination by $H_2O$ or $CO_2$ in the air and enable SrO to play as the main cathode material. It was confirmed that the high secondary electron emission characteristics of SrO by Xe ion can bring considerable driving voltage reduction and improvement of luminance and luminous efficacy in PDP.

• Annual Conference of KIPS
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• 2002.11b
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• pp.1079-1082
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• 2002

최근 암호문을 변경할 수 없다는 안전성(CCS)을 제공하는 공개키 암호 알고리즘에 대한 필요성이 제기되었고, 그에 따른 안전성이 증명 가능한 공개키 암호 방식을 개발하려는 연구가 활발히 진행되고있다. 본 논문에서는 [7]에서 제안한 안전성이 증명 가능한 공개키 암호시스템을 이용하여 안전한 E-mail 어플리케이션을 구현하였다. 구현한 E-mail 어플리케이션은 사용자가 자신이 원하는 공개키 알고리즘, 대칭키 알고리즘, 해쉬 알고리즘 등을 선택하여 사용할 수 있고, 누구나 쉽게 사용할 수 있도록 인터페이스를 구성 하였으며 E-mail과 접목하여 활용 가능하다는 장점이 있다.

• Proceedings of the SAREK Conference
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• 2005.06a
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• pp.187-187
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• 2005

• Communications of Mathematical Education
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• v.20 no.4 s.28
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• pp.603-619
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• 2006

One of the most important aims in mathematics education is to enhance students' problem-solving abilities. To achieve this aim, in real school classrooms, many educators have examined and developed effective teaching methods, learning strategies, and practical problem-solving techniques. Among those trials, it is noticeable that Engel, Zeits, Shapiro and other not a few mathematicians emphasized 'Invariance Principle' as a mean of solving problems. This study is to consider the basic concept of 'Invariance Principle', analyze 'Invariance' concept in secondary Mathematics contents on the basis of framework of 'Invariance Principle' shown by Shapiro and discuss some instructional issues to occur in the process of it.

• Annual Conference of KIPS
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• 2001.10a
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• pp.481-484
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• 2001

패턴은 시스템 디자인 시에 자주 발생하는 문제들에 대한 재사용 가능한 해결책으로써, 증명된 이전의 경험으로부터 나온 공통적인 솔루션에 대한 표현이다. 소프트웨어 산업계에서는 컴포넌트 개발 기술에 대한 관심이 높아지면서 EJB 모델의 효율적인 디자인에 대한 많은 연구가 진행되고 있다. 본 논문에서는, EJB 모델의 설계 단계에서 발생되는 문제점들을 해결하여 보다 효율적인 EJB 디자인을 위해 패턴을 적용한 사례를 보인다. 또한 적용한 사례를 UML을 사용하여 구체화 시킨다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3086-3088
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• 1999

An ultrasonic sensor is one of most popular sensor used to navigate mobile robots within environments containing obstacles. But many navigation algorithm have studied because of the drawback of ultrasonic sensor such that poor directionality, frequent misreadings, specular reflections. Also, the most crucial drawback of this algorithm, that is VFF, VFM, EDM, PFM, WFM, GFM etc. has been that the mobile robot may become trapped in a local minimum. In this paper, we present a theoretical study of a navigation algorithm which integrals a heuristic-search local minimum (or trap) recovery method with a vector-field based method to maneuver cylindric mobile robots in unknown of unstructured environments. Also, an autonomous mobile robot uses dead-reckoning to estimate the current position and orientation of a mobile robot.

• Proceedings of the Korean Society of Toxicology Conference
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• 2002.11b
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• pp.172-172
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• 2002

This study was carried out to develop the antitoxic compound about cytotoxicity of cadmium on NIH 3T3 fibroblasts. These cells divided into 3 groups: control groups (cadmium only) or MTT50 group (NIH 3T3 fibroblasts, 53.32 ${\mu}$M cadmium) and experimental group (53.32 ${\mu}$M quercitrin and 54.72 ${\mu}$M quercetin). (omitted)

• Proceedings of the KIEE Conference
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• summer
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• pp.60-63
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• 2004

AGC is widely used to regulate the frequency of power systems. It is also used to control the frequency of Korean Power System. Control strategies depends on systems to which it is applied. Korean Power System consists of one control area and it has no tie-line. In this research, we have developed a simulation tool to confirm AGC dynamics. The developed tool has been verified by two-machine three-bus system. Moreover an AGC control strategy has been suggested to avoid contradiction with governor dynamics. Low pass filter with relatively long time constant showed good regulation performance. This simple strategy is expected to be applied to New EMS in KPX to get reasonable AGC regulation performance.

• Journal of the Korean neurological association
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• v.36 no.4
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• pp.333-336
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• 2018

Carotid free-floating thrombus (FFT) is a rare cause of stroke. The FFT is commonly associated with an atherosclerotic plaque rupture, but other causes need to be examined in young patients. We report a case of 31-year-old male patient with recurrent ischemic stroke caused by carotid FFT. Although initial laboratory test was unremarkable, recurrent stroke events led us to perform additional study and antiphospholipid syndrome (APLS) was diagnosed. Repetitive testing for APLS seems considerable when young patients present with recurrent stroke.

• International Journal of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.1-7
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• 2023

Since the first outbreak of COVID-19 in 2019, it has caused a huge blow to the restaurant industry. However, as social distancing was lifted as of April 2022, the restaurant industry gradually recovered, and as a result, interest in restaurant start-ups increased. Therefore, in this paper, big data analysis was conducted by selecting "restaurant start-up" as a key keyword through social media big data analysis using Textom and then conducting word frequency and CONCOR analysis. The collection period of keywords was selected from May 1, 2022 to May 23, 2023, after the lifting of social distancing due to COVID-19, and based on the analysis, the development of a restaurant start-up consulting chatbot service is proposed.