• Journal of Sensor Science and Technology
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• v.25 no.3
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• pp.229-234
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• 2016

Self-powered neutron detector (SPND) is being widely used to monitor the reactor core of the nuclear power plants. The SPND contains a neutron-sensitive metallic emitter surrounded by a ceramic insulator. Currently, the vanadium (V) SPND has been being developed to be used in OPR1000 nuclear power plants. Some Monte Carlo simulations were accomplished to calculate the initial sensitivity of vanadium emitter material and alumina insulator with a cylindrical geometry. An MCNP code was used to simulate some factors (neutron self-shielding factor and beta escape probability from the emitter) and space charge effect of an insulator necessary to calculate the sensitivity of vanadium detector. The simulation results were compared with some theoretical and experimental values. The method presented here can be used to analyze the optimum design of the vanadium SPND and contribute to the development of TMI (Top-mount In-core Instrumentation) which might be used in the SMART and SMR.

• Journal of the Regional Association of Architectural Institute of Korea
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• v.21 no.3
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• pp.11-21
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• 2019

The purpose of this study was to present an analysis model for finding the correlation between visibility and evacuation time as users move in the outpatient department of the general hospital. The spatial scope of the study was limited to the first floor and second floor which are used for the outpatient department. Traffic density in outpatient departments was surveyed on site. Based on the surveyed traffic density, the evacuation simulation model was established for calculating the escape route and evacuation time for an individual user. The traffic density of the outpatient department as per the evacuation time was also calculated. With using evacuation simulations, the flow of evacuees was calculated through the density of traffic over the time of evacuation. Visibility data were set in the simulation model for users' escape routes. A correlation analysis between the product of evacuation flow measure and visibility measure of the evacuation population and evacuation time was performed. The analysis result showed negative correlation within a specific distance range. This study presented an analysis model showing that the evacuation condition considering spatial visibility in the outpatient department of general hospital visibility was negatively related to the analyzed evacuation time at the design stage.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.9
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• pp.2846-2866
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• 2022

Caenorhabditis elegans exhibits sophisticated chemotaxis behavior through two parallel strategies, klinokinesis and klinotaxis, executed entirely by a small nervous circuit. It is therefore suitable for inspiring fast and energy-efficient solutions for autonomous navigation. As a random search strategy, the Lévy walk is optimal for diverse animals when foraging without external chemical cues. In this study, by combining these biological strategies for the first time, we propose a spiking neural network model for search and contour tracking of specific concentrations of environmental variables. Specifically, we first design a klinotaxis module using spiking neurons. This module works in conjunction with a klinokinesis module, allowing rapid searches for the concentration setpoint and subsequent contour tracking with small deviations. Second, we build a random exploration module. It generates a Lévy walk in the absence of concentration gradients, increasing the chance of encountering gradients. Third, considering local extrema traps, we develop a termination module combined with an escape module to initiate or terminate the escape in a timely manner. Experimental results demonstrate that the proposed model integrating these modules can switch strategies autonomously according to the information from a single sensor and control steering through output spikes, enabling the model worm to efficiently navigate across various scenarios.

• Journal of Distribution Science
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• v.20 no.11
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• pp.99-108
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• 2022

Purpose: The wide distribution of smartphones has changed life and user behavior. This phenomenon has both advantages and disadvantages for users. As smartphones become a part of our daily lives, smartphone addiction has recently become a social issue in many countries. This study explores factors that affect smartphone addiction and the consequences of addictive behaviors. Research design, data and methodology: Our model hypothesizes that four key factors determine addictive behavior: flow, enjoyment, preference for online social life, and escape reality. Commitment and compulsive use are mediating variables that connect key drivers and addictive results. Based on the SEM (structural equation model) analysis of 497 survey responses, these four driving factors each have a significant effect on the compulsive use of smartphones directly or indirectly; the compulsive use of smartphones directly influences the three results Results: We conducted a reliability and validity analysis, and the results were successful. In the hypothesis test, every path is accepted as expected at the significance level of 0.05. Conclusions: Among the four driving factors, escape reality is the vital factor influencing smartphone addiction and its consequences. And anxiety is the number one consequence influenced by the compulsive use of smartphones.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.383-384
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• 2020

다중 이용시설, 학교, 주택 등 사람이 많이 이용하는 곳은 화재 발생 빈도가 높을 뿐만 아니라 대피하기가 어렵고, 기존의 비상등 표시 방법, 일회성 대피 안내 등으로 인해 화재 상황의 다양한 변수에 효과적으로 대처하기 어렵다. 본 논문에서는 디지털 트윈(Digital Twin) 기술을 기반으로 다양한 센서를 통해 인식된 화재 요소를 반영한 화재 대응 및 피난 시뮬레이션(Fire Dynamic Simulator & Pathfinder)을 통해 안전한 대피 경로를 도출하여 안내하는 시스템을 설계한다. 제시하는 방법은 화재 상황에 능동적으로 대처하기 위해 실시간 인원변동 및 변화하는 화재변수에 대비 할 수 있으며, 상황에 따른 적극적인 대피 훈련과 실제 상황에서의 긴급한 상황에서의 대피경로 도출과 안내에 활용할 수 있다.

• Proceedings of the KIEE Conference
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• 2003.10a
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• pp.53-56
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• 2003

Photometric analysis is essential process to make design for 300W Electrodeless flood lighting fixture. But lighting source's unusual shape makes it difficult to fix in and so we supposed two kinds of installation method to solve this matter. One is to place lamp base down and second is to put lamp base side like normal HID lamps. In result, former photometric analysis came to reach a target for similar asymmetric photometric data meanwhile we can not escape work to design complicated reflector. Second analysis reached conclusion that it is more simplified reflector than former. On its lighting fixture's design, the former reflector is new and attractive breaking fixed idea but the latter is only staying in the range of existing HID lighting design.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2005.10a
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• pp.221-222
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• 2005

Nowadays, the consuming society, the quality of wideness is increasing as the economic life level increases. Modern's any of large department stores, playing a very important role in the middle of our consuming culture, is creating a new life culture and life patterns including producing a new consuming value, too. This is a plan for a renewal design of an inner shop at a department store for brand launching in Seoul, which was planed to escape from the brand's own cold color to show up the product's color using indirect illumination. It was also considered clients' path lines who may keep at a distance to come into an expensive brand's store by designing the whole area as a show room, so there a window display and a harmony with the products let the shop be well functionalized.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.1041-1044
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• 1998

In this paper the cellular neural networks with annealing capability is designed. The annealing capability helps the networks escape from the local-minimum points and quickly search for the global-minimum point. A 6$\times$6 CNN chip is designed using a $0.8\mu\textrm{m}$ CMOS technology, and the chip area is 2.89mm$\times$2.89mm. The simulation results for hole filling image processing show that the general CNN has a local-minimum problem, but the annealed CNN finds the global-minimum solutions very efficiently.

• Journal of the Korea Institute of Military Science and Technology
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• v.16 no.2
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• pp.146-153
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• 2013

Visual information and aural warning of independent aircraft survivability equipment increase the pilot workload and limit the effective countermeasures. For increase the aircraft survivability, Integrated design of survivability display and aural warning need to consider pilot intuitions. If pilot aware the threat by intuition, evade or escape from the threat using the countermeasures equipment, it will increase the survivability. This paper describe the design and verification of for Utility Helicopter survivability equipment.

• Fire Science and Engineering
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• v.2 no.2
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• pp.3-8
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• 1988

Due to its commercial, ceremonial function, the hotel design has a tendency to be higher and larger, and its form being varied. But this tendency is not desirable in respect of architectural fire-safety. The higher its height and the larger its mass becomes, relatively the damage expectation becomes. Moreover, in case of fire, it is expected that many serious problems break out, because the users of a hotel, unlike those of office building or housing, are majority of unspecified people and they have no information about that building. Therefore, this study dealt with fire-safety problem in hotel design and tried to find out countermeasures of fire-safety and successful escafe against fire.