• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.621-624
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• 2007

군집로봇이란 하나의 일을 단순한 작업을 하는 여러 대의 로봇을 이용하여 수행하는 로봇들을 일컫는 말이다. 본 연구에서는 군집로봇을 이용하여 미로를 탐색하고 스스로 작업을 분할하여 목표물을 운반하는 로봇 제어프로그램을 작성했다. 또한 작성된 제어 프로그램으로 로봇 수와 작업 목표물 개수에 따른 군집로봇의 효과에 대하여 실험하였다. 작성된 제어 프로그램을 시뮬레이션 환경에 적용하여 실험한 결과 군집로봇을 사용하면 작업시간을 단축시킬 수 있었다. 또한 작업을 효과적으로 수행하기 위해서 로봇 수를 늘리는 것은 일정 한계까지 작업 효과가 증가하며 그 이후에는 오히려 작업 효과를 저해함을 알 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.436-438
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• 2024

의료 당국은 가능한 최상의 서비스를 보장하기 위해 코로나19와 같은 전염병 기간뿐만 아니라 일상적인 운영에서도 의료 공급망 프로세스를 효과적으로 관리해야 한다. 제품 리콜, 제품 공급 부족 모니터링, 만료 및 위조는 방지되어야 하는 중요한 의료 공급망 운영 중 일부이다. 본 논문에서는 블록체인과 분산형 스토리지 시스템을 사용한 위조 의약품 유통 방지 시스템을 제안한다. 제안하는 솔루션은 투명성을 높이고, 이해 관계자간의 커뮤니케이션을 개선하며, 제품 조달 일정을 단축하는 동시에 중요한 격차와 결함을 제거한다.

• Journal of Intelligence and Information Systems
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• v.7 no.1
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• pp.81-95
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• 2001

Plant construction projects usually take much higher uncertainty and risks than the projects from other domains. This implies the importance of plant construction project management should be more emphasized than the other domain. Especially, the overall successes of the projects often depend on the performance of process planning and scheduling performed at the initial stage of the project. However, most plant construction projects suffer great difficulties in establishing proper process planning and scheduling timely because of unstructureness and dynamicity of environment of the project itself In this paper, we propose a knowledge-based process planning and scheduling approach in a plant construction domain to cope this problem. First, we modulize process planning knowledge and present the knowledge representation scheme. Second, we propose an inferencing mechanism to build a process planning for plant construction based on the represented process planning knowledge. Since our approach automate the initial process planning, which was usually done by manual way, it can improve the correctness and also completeness of the process plan and schedule by reducing the time to plan and allowing simulations on the various situation. We also design and implement this our approach as a real working system, and it is successfully applied to real plant construction cases from a leading construction company in Korea. Based on this success, we expect our approach can be easily applied to the projects of other areas, while contributing to enhancement in productivity and quality of project management.

• Journal of Biosystems Engineering
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• v.29 no.2
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• pp.141-150
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• 2004

우리가 소비하는 가공 식품은 위생상 안전하도록 살균처리가 이루어진다. 식품 내에 존재할 수 있는 유해 세균은 일정 살균온도에서 살균에 필요한 시간 동안 노출되면 사멸하며, 일반적으로 살균온도가 높을수록 살균에 필요한 시간은 단축된다. 연속살균장치는 혼합 및 저장탱크에 담겨진 식품을 점프로 이동시키면서 가열 열교환기에서 살균온도로 가열하고 단열관을 거치는 동안 살균온도를 유지시켜 살균을 완료한다. 또한 살균된 식품은 냉각용 열교환기에서 상온으로 냉각되며 이 과정에서 회수되는 열은 저장탱크에서 유입되는 식품의 예열에 사용되어 에너지 효율을 제고하는데 사용되기도 한다. 이와 같이 관을 이동하면서 가열되는 살균장치는 기존의 배치식 살균방법에 비하여 균일하게 가열이 이루어지므로 130C의 고온으로 살균할 수 있어서 살균에 필요한 시간을 수초에서 수십초 정도로 단축시킬 수가 있고 그에 따라 열손상을 크게 줄일 수 있다. 또한, 상온으로 냉각된 식품을 포장함으로써 저렴한 가격의 포장용기를 사용할 수 있고 상온에서 저장할 수 있으므로 저장비용이 저렴한 장점이 있다. 그러나, 가공식품에 고기나 야채와 같은 고체 상태의 식품이 함유된 경우에는 액상 식품이 열 교환기에서 순간 가열되며, 고상 식품은 액상식품과의 대류에 의한 열전달로 가열된다. 이 과정에서 고상식품은 이동관 내벽이나 다른 고상식품과 부딪치거나 회전하면서 이동관 내부에서 자유롭게 운동하게 된다. 이 과정에서 액상식품과의 상대이동 속도가 발생하여 이것이 대류열전달에 영향을 미치게 된다. 이 상대이동속도에 따른 대류 열전달계수는 고상식품의 내부온도 결정에 사용되는 연속살균장치의 중요한 설계인자이다. 대류열전달계수는 연속살균장치에서 자유로이 이동하는 고상식품의 중심부의 온도를 측정하여 결정할 수 있으나 이는 현실적으로 어렵다. 따라서 본 연구에서는 고정된 고상식품에 액상식품을 이동시켜 상대속도를 재현하고 액상식품의 온도와 고상식품의 중심온도를 측정하는 장치를 개발하였으며, 각 상대속도와 액상식품의 점도 별 대류열전달계수를 결정하는 프로그램을 유한차분법을 이용하여 개발하였다. 이 장치를 분당 15, 30, 40 리터의 유량에서 유체의 점도를 0에서 15 centipoise 사이의 세 수준에서 정육면체 소고기를 모델 고상식품으로 내부 온도분포를 측정하였으며, 유한차분법 프로그램으로 대류열전달계수를 결정하였다. 대류열전달계수는 792에서 2,107 W/m$^2$로 분석되었다. 대류열전달 계수는 액상식품과의 상대속도가 증가함에 따라서 증가하였고, 점도가 증가함에 따라서는 감소하였다.

• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.5
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• pp.19-28
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• 2017

Effects of cavitation and hydraulic flip in circular and elliptical nozzles on the flow characteristics have been studied. Spray tests were conducted using injectors with different ratios of an orifice length(L) to a diameter(d) and of a major axis diameter(a) to a minor axis diameter(b). With the increment of an injection pressure drop, discharge coefficients slightly decreased in cavitation flows, and those suddenly dropped and were almost constant in hydraulic flip flows. For elliptical nozzles with L/b > 8 and L/a < 8, discharge coefficients and flow patterns showed different results from those in previous circular nozzles. When a flow in the elliptical nozzle was under steady condition, as the liquid column went downstream from the nozzle, its spray angle a little decreased in the plane of a major axis and increased in the plane of a minor axis.

• The Journal of the Acoustical Society of Korea
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• v.13 no.2E
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• pp.20-25
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• 1994

The major drawback to the Code Excited Linear Prediction(CELP) type vocoders is their large computational requirements. In this paper, a simple method is proposed to reduce the pitch searching time in the pitch filter almost without degradation of quality. Bease upon the observational regularity of the correlation function of speech, the searching range can be restricted to the positive side in pitch search. This is done by skipping the negative side with the width which is estimated from the previous positive envelope. In addition to that, the maximum number of available lags can be limited by the threshold, $L_T$, which is set on 58 empirically. So, only the limited numbers of lags are considered in pitch search, which is less than a half of that of the full search method. By using the proposed method in pitch search, its required computations are greatly reduced. Experimental result shows 51% time reduction almost without lowering the speech quality in segmental SNR measure.

• Explosives and Blasting
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• v.21 no.3
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• pp.49-60
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• 2003

Nowadays it is tendency to make a remodelling or demolition of old structures with the rapid development of blasting technique. In this treatise it is arranged of improvement procedure of blasting demolition method in korea which was begun since August 1991. Recently, the blasting demolition method has much merits with 60-70% reduction effect of construction period than mechanical demolition method. and so that it has much economical points specially over than 5 storied high buildings. In order to maximalize economical effects of the blasting demolition method, environment safety and recycling, it must be needed. at first to develop the estimating programs against vibration, noise, flying stones, and dust. Also it is required to take a responsibility for using recycling materials after blasting demolition of old structures, and to be invested to advance the blasting demolition techniques.

• KIPS Transactions on Computer and Communication Systems
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• v.9 no.1
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• pp.1-8
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• 2020

The thermal image device support image to detect infrared light from the object without light. It can use not only defence-related industry, but also civilian industry. This paper presents a new thermal image processing module using common image processor. The proposed module shows 10~20% performance improvement with normal mode and 50% performance improvement with sleep mode compared with the previously thermal image module based FPGA. and it guarantees high scalability according to modular system. In addition, the proposed module improves modulation and reuse, so it expect to have reduction of development period, low development cost. various application. In addition, it expect to have satisfaction of customer requirements, development design, development period, release date of product.

• Journal of Korea Society of Industrial Information Systems
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• v.18 no.2
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• pp.27-34
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• 2013

NAND Flash Memory has been used in several devices by low cost and high capacity, and the demand for mass NAND Flash Memory has increased due to the multimedia extension of mobile devices. The JFFS2, NILFS2, and YAFFS2 file systems are used mainly in NAND Flash Memory. In this paper, the performance of Sequential read/write of the 3 file systems are analyzed for the 4 I/O schedulers : CFQ(Complete Fair Queuing) I/O scheduler, NOOP(No Operation) I/O scheduler, Anticipatory I/O scheduler, and Deadline I/O scheduler. In JFFS2 file system, Anticipatory I/O scheduler has the best performance by 8% decreasing speed in writing time and 1.5% decreasing speed in reading time compared to the other I/O scheduler. In YAFFS2 file system, it results are similar to performance in reading and writing for the 4 I/O schedulers. In NILFS2 file system, NOOP I/O scheduler has 2% faster in writing and Deadline I/O scheduler has 6% faster in reading than other I/O schedulers.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.2
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• pp.211-218
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• 2017

In this study, we implemented IoT Sensor Network using Mobius Platform and implemented four kinds of Z-wave sensors applicable to smart home service to verify its performance. The 12 common service functions (CSF) provided by Mobius enable application services including status monitoring of sensors to be implemented quickly. The standard service procedures and protocols have eliminated the design process of the system and shortened the meeting time for establishing protocol between application software developer, gateway developer and sensor developer, and discussion time for adjustment of opinion. We confirmed that the application service based on the implemented sensor network and the implementation of IoT sensor can shorten the development schedule, and confirmed that most of the products purchased in the market can be accommodated without change. We hope that such speediness and openness will be able to meet the demands of various services and contribute to expanding services and creating new markets.