• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.166-167
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• 2002

광자 크리스탈은 빛의 진행을 제어할 수 있는 잠재적인 능력과 Wavelength Division Multiplexing 통신 시스템에서 광소자의 구현 가능성 때문에 활발히 연구가 진행 중이다. (1-3) 본 논문에서는 광자 크리스탈의 채널 드롭 터널링 현상을 이용하여 1x4 Demultiplexer의 구현 가능성을 고찰하였다. 광자 크리스탈을 이용해서 공진 시스템을 구성하였고, 중앙에 위치한 2개의 작은 디펙트의 크기를 조절하여 채널 드롭 현상을 관찰하였다. (중략)

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1071-1072
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• 2008

본 논문에서는 고속철도 전차선로 드롭퍼 와이어의 파단현상에 대해 분석을 통하여 철도운행의 안정성 향상을 위한 기초연구를 수행하였다. 300km/h로 주행하는 KTX의 판토그래프와 전차선이 직접 접촉하면서 발생되는 기계적 피로도의 누적으로 인한 증가로 경부고속선 전차선로 시스템의 장애사고 예방을 목적으로 하고 있다. 추후, 고속철도 전차선로 드롭퍼 수명한계 측정으로 유지보수관리 체계 효율화와 분석된 파단원인을 바탕으로 드롭퍼 구조개선 방안을 마련하여 합리적 개량방안 수립을 하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.3023-3031
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• 2013

In this paper, we propose a robot control data generation system applying context aware mechanism in order to control the robot manipulator which automatically sorts parcels. The context aware mechanism generates intelligent information to control a robot using context data such as the parcel shape, weight, location and barcodes. The proposed system collects context data of the parcel and generates robot control data to pick up and drop parcels. Then a robot manipulator, which receives control data of picking-up and dropping, processes the automated sorting of parcels according to delivery persons and delivery routes. It will contribute not only to save much time and cost but also to reduce the industrial accidents.

• Journal of the Korea Institute of Building Construction
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• v.17 no.4
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• pp.349-360
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• 2017

In concrete construction work, formwork is an important process that accounts for 10% of the total construction cost. Recent buildings are becoming bigger and higher. In order to maximize the efficiency and safety of this formwork, the system of formworking has been systematized. However, the human accidents and the noise complaints arise from dismantling processes frequently occur. In order to solve these problems, most of them are dependent on foreign technology, but they do not take into consideration the conditions of domestic construction site. In this study, we developed a table type multi-drop system form for a slab and beam which can improve the process, safety and reduction of disassembly noise, and evaluated the physical properties of the main members which are used in the system. The results of this study show that there is sufficient strength to be used as a slab and a laying material for both a yoke beam and a supporting post. The noise level is improved compared to existing method.

• Journal of Appropriate Technology
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• v.7 no.2
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• pp.206-210
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• 2021

Hyperbilirubinemia is the most common neonatal disease and is observed in about 80% of newborns worldwide in neonatal period within a week after birth. Untreated infant hyperbilirubinemia may lead to brain damage and even death, so it is very important to diagnose it quickly and accurately. In this study, a total bilirubin measurement system was developed that is portable and easy to use without pre-processing using a commercial smartphone. This system measures using the LED and camera of the smartphone without the need for additional devices, and because a small amount of blood is injected without pre-treatment, anyone can easily measure it in the field. In a comparative study with Cobas c111 results, accuracy meets CLIA guidelines with 94% (17/18) within ±0.4 mg/dL below 3 mg/dL and 98% within ±20% above 3 mg/dL (276/282). This system offers a simple, fast and accurate diagnosis for jaundice in infants and young children in low-resource settings.

• Korean Journal of Applied Biomechanics
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• v.19 no.4
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• pp.647-653
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• 2009

The purpose of this study was to investigate the differences between female and male ballet dancers in anterior cruciate ligament injury risk factors during the box drop landing task. Nine female and nine male collegiate ballet dancers participated in this study. Kinematic and ground reaction data were collected and combined with inverse dynamics to estimate the knee extensor and abductor moment. EMG data from the biceps femoris and rectus femoris were used to estimate the ratio of quadriceps-hamstrings muscle activity. No gender differences in anterior cruciate ligament injury risk factors were found during the box drop landing task. A significant relationship was found between female and male ballet dancers in the knee flexion angle.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.7
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• pp.190-200
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• 2014

The video-based system of the broadcasters and the video-related institutions have shifted from analogical to digital in worldwide. This migration process can generate a defect, digital dropout, in the quality of the contents. Moreover, there are limited researches focused on these kind of defects and those related have limitations. For that reason, we are proposing a new method for feature extraction emphasizing in the peculiar block pattern of digital dropout based on discrete cosine transform (DCT). For classification of error block, we utilize support vector machine (SVM) which can manage feature vectors efficiently. Further, the proposed method overcome the limitation of the previous one using continuity of frame by frame. It is using only the information of a single frame and works better even in the presence of fast moving objects, without the necessity of specific model or parameter estimation. Therefore, this approach is capable of detecting digital dropout only with minimal complexity.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.11a
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• pp.14-15
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• 2021

Even though the Al. form system, which was developed to replace the Euro-form, has been used as the slab lower formwork for almost all concrete structures based on the light weight and high conversion rate, the low-noise Drop method has been developed and used in order to overcome the limitations of the Al. Form system such as noise pollution and safety accidents caused by free fall during the demolding. However, as the low-noise drop method is still insufficient, Safety Full Drop Al. Form method is expected to be in the spotlight in the construction market based on its excellent advantages compared to the developed methods. In addition, we plan to conduct research to further contribute to securing the quality of the overall structure through continuous improvement and supplementation by introducing an automation system to the very construction method.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.219-225
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• 2000

본 연구에서는 이산사건 동적 시스템을 모델링하고 성능을 분석하기 위한 통합 소프트웨어를 개발하였다. 소프트웨어는 페트리네트를 기반으로 비쥬얼 C++와 비쥬얼 베이직을 이용하여 개발되었으며 윈도우즈 환경 하에서 동작하는 범용 그래픽도구를 내장하고 있다. 본 소프트웨어를 이용하면 사용자는 마우스의 드래그 앤 드롭만으로 페트리네트 모델을 작성할 수가 있으며 모델이 작성되면 수리적 분석과 시뮬레이션을 통하여 시스템의 성능분석을 자동으로 수행하여 준다. 또한 시스템의 논리적인 특성을 분석하기 위하여 coverbility tree와 reachability tree를 지원한다. 이외에도 deadlock을 탐지하고 이를 해소하는 기능과 정교한 세부 모델링이 가능하도록 다양한 활성화 함수와 분포를 지원하며 시스템의 성능척도와 관련된 다양한 통계치를 제공해준다.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.8
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• pp.783-787
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• 2008

IEEE 802.16/WiBro, one of the representative Broadband Wireless Access (BWA) systems, defines QoS negotiation between BS and SS and five service classes to guarantee QoS for flows. The five service classes are UGS, ertPS, rtPS, nrtPS, and BE, but the standard does not define how to provide services to flows according to the service classes. Existing research works have been studied about the scheduler architecture to effectively utilize the IEEE 802.16/WiBro systems. These works use the original packet scheduling algorithm for service classes. However, it is necessary to consider bandwidth allocation mechanisms in scheduling algorithms since bandwidth allocation mechanisms are different according to service classes. Especially, bandwidth allocation mechanisms should be considered for the scheduling of rtPS class since rtPS class uses the polling mechanism that takes time to allocate bandwidth and has the minimum latency constraint. Therefore, we propose two stage dropping scheme for rtPS class that is sensitive to latency, and thus it reduces the wasted resources and provides efficient service to rtPS class.