• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.349-352
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• 2010

This is conceptual study of vitiated air heater(VAH), the necessary ground test facility, for characteristics studies of scramjet combustion and development of scramjet engines. The VAH is one of various types which provided hot air to an intake or a combustion chamber of scramjet and it must use suitable fuel to get hot combustion gas and more similar mixture gas(vitiated air) to real air. In the study, foreign VAHs being capable of providing very high temperature were researched, and injectors for VAH using LNG(CH4) or hydrogen were designed conceptually to develop scramjet vehicle.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.59-62
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• 2016

최근 무선통신기술과 소형 하드웨어의 발전으로 모든 환경에서 네트워크 및 컴퓨팅이 가능한 IoT(Internet of Things) 기기들이 지속적으로 증가하는 추세이며, 이러한 IoT 트랜드는 지속될 전망이다. 기존 IoT 플랫폼은 일반적으로 전력 사용적인 측면에서 In-memory 컴퓨팅을 지향하지만 이러한 방식은 시스템 에러 발생 시 메모리의 휘발성으로 인해 신뢰성이 저하되는 단점이 있다. 본 논문에서는 전체 시스템의 신뢰성 향상을 위해 XML 형식의 파일과 관계형 데이터베이스를 이용한 IoT 기반 상황 인식 시스템 서버를 설계한다. 설계된 상황 인식 시스템 서버는 추론 엔진을 포함하고 있으며, 사용자가 등록한 룰과 수집된 상황 데이터를 이용하여 전체 시스템을 동작시킨다. 또한, 전체 시스템의 신뢰성을 검증하기 위해 3가지 동작 시나리오를 제안한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.11 no.8
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• pp.1329-1336
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• 2000

A new fractal geometry of the traveling wave type cross antenna is newly presented. In the conventional type of the traveling wave antenna, the electrical length of the radiating conductor increases as the order of fractal expansion increases. But, increased length of the current path degrades the performance of the antenna from the various loss mechanism of the traveling wave type antenna. To reduce the antenna performance degradation, the new hybrid fractal antenna, which divides the entire fractal structure into some smaller ones and connects each smaller fractal group with a power divider is presented. The secondly, thirdly and fourthly expanded hybrid fractal cross antennas are fabricated and their performances are examined by measurements. Influences of the fractal order to the antenna performance are examined.

• 한국만화애니메이션학회:학술대회논문집
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• 2011.05a
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• pp.23-30
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• 2011

지금, 세계는 바야흐로 'Social Network Service(이하 SNS)의 시대' 이다. SNS란 '일련의 관계에 의해 모인 사람들 간의 관계망을 특정 체계를 통해 대중에게 제공하는 것' 이라고 할 수 있다. 과거 향우회, 동문회처럼 오프라인에서 존재했던 이러한 관계망이 온라인으로 도입된 것이 현재 SNS라고 일컫는 서비스이다. SNS가 큰 인기를 끌고 정보 사회가 발전함에 따라 SNS의 서비스와 형태도 점차 다양해져 왔다. 특히나 그림 영상 등의 시각적인 요소를 사용한 의사소통과 정보의 공유가 과거 그 어떤 매체보다도 손쉽고 빠르게 이루어지고 있다. 인간의 거의 모든 문화 사회적 활동에 컴퓨터가 기반이 됨으로써, 우리는 점차 텍스트, 사진, 영화, 음악, 가상환경 등과 같은 문화 데이터와 더욱 밀접한 관계에 놓이게 되었으며 이것은 SNS에서도 예외가 아니다. 우리는 더 이상 컴퓨터를 마주하는 것이 아니라 디지털 형식으로 기호화된 문화와 마주하고 있으며, 그 중심에는 시각적인 요소들, 즉 '이미지'가 있다. 이러한 점에 착안하여 본 연구는 'SNS'와 그 이미지들의 특성에 대한 이해를 선행한 뒤, 최근 국내에서 가장 활발한 성장세를 나타내고 있는 SNS인 미투데이 페이스북 이상의 두 서비스의 사례를 분석할 것이다. SNS의 이미지의 정체성, 이미지 표현의 특징과 양상이 어떠한지를 분석하고 SNS에서 사용되는 이미지와 그 의미를 보다 심층적인 관점에서 이해해 보는 것은 SNS를 중심으로 형성되어 있는 관련 업계와 학계에 유의미한 내용을 제공할 것으로 기대된다.

• Journal of Korean Institute of Industrial Engineers
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• v.41 no.5
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• pp.414-424
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• 2015

In this research, we consider a smart grid network of electricity with multiple consumers connected to a monopolistic provider. Each consumer can be informed the real time price changes through the smart meter and updates his consumption schedule to minimize the energy consumption expenditures by which the required power demand should be satisfied under the given real time pricing scheme. This real-time decision making problem has been recently studied through game-theoretic approach. The present paper contributes to the existing literature by incorporating storage appliance into the set of available household appliances which has somewhat distinctive functions compared to other types of appliances and would be regarded to play a significant role in energy consumption scheduling for the future smart grid. We propose a game-theoretic algorithm which could draw the optimal energy consumption scheduling for each household appliances including storage. Results on simulation data showed that the storage contributed to increase the efficiency of energy consumption pattern in the viewpoint of not only individual consumer but also whole system.

• Journal of Ocean Engineering and Technology
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• v.31 no.2
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• pp.164-169
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• 2017

Studies were performed on an ARS using SDINS's RLG and the geomatic sensor. To develop the ARS, experiments were performed to determine the characteristics of the RLG and geomatic sensor. Based on the results, to reduce the angular position errors of the RLG, which accumulate from the angular velocity data, an algorithm was studied that uses the Extended Kalman filter (EKF) to compensate the RLG data and geomatic sensor data. To verify the performance of the developed algorithm for reducing the cumulative angular errors, experiments that included the developed EKF were performed. Through these, it was shown that a drastic reduction in the angular errors of the RLG were achieved.

• Journal of Digital Convergence
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• v.17 no.11
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• pp.225-232
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• 2019

This study proposes a temporary residential prefab modular structure to provide residential space to displaced people after a disaster. Patent cases related to prefab structures are collected for related design implementations, and classified. Space in temporary residential prefab modular structures must consider factors such as "Expandability", "Assembly and Disassembly", "Built-in Structure", and "Energy Efficiency", and the cases are classified into "Detailed Assembly Modular Type", "Modular Expandable Type", and "Space Unit Expandable Type". Overseas patents cases will be collected and analyzed in future studies for providing the efficient way for mass production for the lowest production cost.

• Journal of the Korean Society of Propulsion Engineers
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• v.15 no.3
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• pp.58-63
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• 2011

The present paper describes a conceptual design of a turbopump which employs a planetary gear system. In a launcher system, weight is one of the most important design factor. In turbopump systems using propellants such as kerosene, or methane, single shaft systems are employed because of simplicity. One of the main disadvantages of this system, however, is the same rotational speed of both pumps and a turbine which forces to operate under non-optimum condition. To operate each component in optimum or favorable rotational speeds, a planetary gear system seems to be the best choice when the compactness and efficiency of a turbopump system is considered. A conceptual design and feasibility of the turbopump system adopting a planetary gear system is suggested.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.34 no.4
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• pp.171-180
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• 2021

Objectives: The purpose of this study is to report the clinical course of a patient with mixed hemorrhoids treated with Korean medicine alone. Methods: A patient visited for an mixed hemorrhoids was treated with Korean herbal medicine. The effects of the treatment were evaluated via photography of hemorrhoids and symptoms of pain, bleeding, prolapse, itching, discharge and Total Symptom Score(TSS). Results: After treatment, in photography before and after, the size of hemorrhoids was reduced and lost. Scores of Pain (4→0), bleeding (3→0), prolapse (3→2), itching (0→0), discharge (1→0) and TSS (11.5->3) were observed. Conclusion: In light of the reduced size of hemorrhoids and scores of symptoms, herbal medicine might be a possible treatment method on mixed hemorrhoids.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.31-33
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• 2022

Research information services such as ScienceON, RISS, and DBpia used by researchers during the R&D process mainly consist of a user interface in the form of a portal and search functions that respond to demands. However, the importance of open collaboration that freely shares and utilizes the research process and results and provides various tools and services necessary for collaborative research is gradually increasing, so there are also limitations to these service roles. Thus, we design WithON, which provides collaborative research environments of a preemptive response method, focusing on a personalized user interface to support the entire R&D cycle. We expect WithON would fundamentally change the existing research information services into collaborative research-centric ones.