• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.2
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• pp.111-116
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• 2014

Using only laser range finder to detect the obstacles in an environment that contains transparent obstacles can not guarantee autonomous mobile robot from collision problem. To solve this problem, a mobile robot using laser range finder must be used additional sensor device such as sonar sensor that can detect the transparent obstacle. In this paper, a method is addressed to deal with the problem to detect the transparent obstacles within environment only by using laser range finder for mobile robot. In case the recognized transparent obstacle, the proposed algorithm is to localize the transparent obstacle to extract and process the reflected noise. This algorithm ensures autonomous of mobile robot only using laser range finder. The effectiveness of the proposed algorithm is evaluated by the real mobile robot and real laser range finder experiments with three case studies.

• Review of KIISC
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• v.34 no.1
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• pp.21-25
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• 2024

최근 몇 년 동안 탈중앙화 금융(DeFi)은 블록체인 기술의 혁신적인 사용을 통해 금융 부문의 지형을 재정의할 획기적인 세력으로 부상했다. 본 연구는 DeFi의 제도화를 향한 패러다임 전환에 대한 포괄적인 기술적 분석을 제시하며, DeFi가 전통적인 금융 시스템을 혼란에 빠뜨리고 글로벌 경제 프레임워크를 재구성할 수 있는 잠재력을 강조한다. 본 연구에서 스마트 계약, 분산형 자율 조직(DAO) 및 합의 알고리즘을 포함한 DeFi 핵심 기술의 복잡성을 조사하고 이러한 요소가 어떻게 집합적으로 보다 개방적이고 투명하며 포용적인 금융 생태계를 조성하는지 탐구한다. 주요 고려 사항에는 규제 장애물, 보안 문제, 확장성 문제, 혁신과 소비자 보호 간의 균형이 포함된다. 금융 포괄성, 특히 은행 서비스를 받지 못하는 인구와 은행 서비스를 받지 못하는 인구에게 금융 서비스에 대한 접근을 제공하는 역량 측면에서 DeFi의 혁신적인 잠재력에 대해 논의하여 일드 파밍, 유동성 채굴, 분산형 대출 등 새로운 금융 상품 및 서비스를 도입하는 데 있어 DeFi의 역할을 평가하여 소비자와 기존 금융 기관 모두에 미치는 영향을 강조한다. DeFi의 기술 기반과 기관 금융 프레임워크 내에서 급성장하는 역할에 대한 자세한 조사를 제공함으로써 본 논문은 금융의 미래 궤적과 글로벌 경제 시스템의 진화하는 역학에 대한 귀중한 통찰력을 제공하는 것을 목표로 한다.

• The Journal of the Korea Contents Association
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• v.20 no.10
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• pp.190-198
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• 2020

The development in smartphone technology has brought convenience to the life of the mankind, but an excessive use of smartphones sometimes causes various accidents. This research tried to propose an application service 'Smombie Safe Go' UI(User Interface) that allows the prevention of such accident while using smartphones when walking. For this, after research and user observations, produced walker journey maps and derived necessary main functions needed for safety, and the result showed that transparent interface, obstacle location alert, warning of dangers functions were necessary. To make the contents of the service more detailed, hazardous situations faced during smartphone use when walking were classified into 3 situations : 1. Obstacle appearing in front, 2. traffic lights on crosswalks 3. No traffic lights on crosswalks. Scenarios by hazardous situation were written, and the flow and UI of the app service that warns its users in each situation of hazards were designed. it is predicted that 'Smombie Safe Go' may be possible to be utilized as an app service that provides a safe walking experience for not only regular pedestrians but also the blind population.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.2
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• pp.322-328
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• 2007

The first molar is important for mastication and also it plays roles to formation of vertical occlusion and growth of jaw bone after mixed dentition. Impaction of mandibular first molar can result in a short lower facial height, formation of a follicular cyst, pericoronal inflammation, resorption of the roots of neighboring teeth and malocclusion. The options of treatment plans are as follows; observation, surgical exposure, orthodontic traction, surgical relocation and extraction. Surgical exposure could be considered as a basic treatment plan. For surgical exposure it is important to maintain patent channel between the crown and the normal eruptive path into the oral cavity, many techniques including cementation of a celluloid crown, packing with zinc oxide-eugenol surgical pack are used. In these cases, we could observe spontaneous eruption of mandibular first molar using surgical exposure with or without removal of odontoma. Also we could obtain the main patency effectively and conveniently by using surgical pack and translucent retainer.

• Journal of the Korean Geophysical Society
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• v.7 no.3
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• pp.193-206
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• 2004

Geophysical data including chirp (3 7 kHz) subbottom profile and detailed bathymetry were obtained over three seamounts in the Ogasawara Fracture Zone (OFZ) of the western Pacific, as a part of manganese crust survey onboard R/V Onnuri in 2003. The OFZ is a 150-km-wide, 600-km-long rift zone, which separates the East Mariana and Pigafetta Basin. The OFZ is unique in that it includes many seamounts (e.g., Magellan Seamounts andseamounts on the Dutton Ridge). The sub-seafloor acoustic echoes obtained near the OFZ were classified into following types on the basis of their characteristics: types I-1(pelagic sediment with parallel or subparallel reflectors), I-2 (pelagic sediment with no internal reflectors), and III-1 (reef build-up complex) on summit; types II-1 and III-2 (basement outcrop) on flank rift zone and upper slope, respectively; type III-3 (slump) on the lower slope and embayment between the flank rift zones; types II-2 (debrite) on the base of slope and basin floor; and types II-3 (turbidite or pelagic sediment) and II-4 (turbidite) on the basin floor. The mass-wasting that produced the complex of type II-2 debrite and III-3 slump on the lower slope and basin may have been caused by (1) strong tensional stress in the OFZ which may cause the numerous fissures or basement faults and (2) complex of the faults on the summit and steep upper slope. The variations in the echo type of pelagic sediment in the summit of seamounts may be related with the changes in the depositional and/or erosional environments. Type I-2 pelagic sediment, which is characterized by a thin and intermittent coverage, was probably deposited at a sheltered area when the current was strong, whereas type I-1 pelagic deposit occurred during a stage of progressive sedimentation.