• Proceedings of the Korean Institute of Interior Design Conference
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• 2003.05a
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• pp.135-138
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• 2003

Skin, the complex membrane that holds the body together, also embraces the full spectrum of design today-from product to architecture, fashion, and media. Every object has a skin. thick or thin, smooth or rough, porous or impermeable, the skin is the line between a hidden interior and an exterior we experience. Skin： Surface, Substance and Design is a compendium of products, furniture, fashion, architecture and media that expand the limits of what we understand as surface. Reflecting the convergence of natural and artificial life, this provocative a thesis shows how enhanced and simulated skins appear everywhere in today's world.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.9
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• pp.4549-4567
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• 2016

To cope with the complex electromagnetic environment of wireless communication systems, anti-jamming decision methods are necessary to keep the reliability of communication. Basing on the rule-reduced genetic algorithm (RRGA), an anti-jamming decision method is proposed in this paper to adapt to the fast channel variations. Firstly, the reduced decision rules are obtained according to the rough set (RS) theory. Secondly, the randomly generated initial population of the genetic algorithm (GA) is screened and the individuals are preserved in accordance with the reduced decision rules. Finally, the initial population after screening is utilized in the genetic algorithm to optimize the communication parameters. In order to remove the dependency on the weights, this paper deploys an anti-jamming decision objective function, which aims at maximizing the normalized transmission rate under the constraints of minimizing the normalized transmitting power with the pre-defined bit error rate (BER). Simulations are carried out to verify the performance of both the traditional genetic algorithm and the adaptive genetic algorithm. Simulation results show that the convergence rates of the two algorithms increase significantly thanks to the initial population determined by the reduced-rules, without losing the accuracy of the decision-making. Meanwhile, the weight-independent objective function makes the algorithm more practical than the traditional methods.

• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.85-90
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• 2015

In this study, the life evaluation due to the structural configuration of bumper attached at the front side of ATV vehicle is studied on the basis of fatigue analysis. As the purpose of this study, the characteristic of bumper exposed on the repetitive loading condition like the vibration is understood. The position of crack happened at the fatigue situation is grasped in advance and complemented in advance. It is considered that the multipurpose vehicle is designed to not be driven on the paved general road but the rough road like the unpaved load. And the weak part of bumper is understood through the study of life evaluation on this driving environment. The durability can be improved by doing the safe design of automotive bumper on the basis of the analysis result. And it is possible to be grafted onto the convergence technique at design and show the esthetic sense.

• Journal of the Korea Convergence Society
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• v.12 no.6
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• pp.33-38
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• 2021

In order to manufacture a lightweight medical radiation shielding sheet, a new shielding material was studied. We tried to verify the possibility of a shielding material by mixing egg shell powder, which is thrown away as food waste at home, with a polymer material. Existing lightweight materials satisfy eco-friendly conditions, but there are difficulties in the economics of shielding materials due to the cost of the material refining process. This study aims to solve this problem by using egg shells, which are household waste. A 3 mm-thick shielding sheet was fabricated using HDPE, a polymer material, and particle distribution within the cross-section of the shielding sheet was also verified. The shape of the particles was rough and there were voids between the particles, and the average weight per unit area was 1.5 g/cm². The shielding performance was around 20% in the low energy area and 10% in the high energy area, showing the possibility of a low-dose medical radiation shielding body.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.12
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• pp.3-12
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• 2016

This paper describes the development of the ground penetrating radar (GPR) system using UWB impulse radar with 48 Channel array. GPR is an effective alternative technology to resolve th disadvantages of metal detectors. Metal detectors have a very low detection probability of non-metallic landmine and high false alarm rates caused by metallic materials under the ground. In this paper, we use the mono-cycle pulse waveform with about 600 ps pulse width to obtain high resolution landmine microwave images. In order to analyze performances of this system, we utilize indoor test facility that made up of rough sandy loam which representative Korean soil. The mimic landmine models of metal/non-metal and anti-tank/anti-personnel landmines buried in DMZ (demilitarized zone) of Korea are used to analyze the detection depth and the shape of the mines using microwave image.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.413-421
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• 2016

This research, mainly focused on the development of the iPhone exclusive app 'Sketch Plus', is on the production of pens within the smart media. Our goal is to develop and reproduce pens with surreal rendering as a base and during that process, describe the fusing process of design perspectives and algorithms. This research comprehends the concept of surreal rendering, which is a technique that mimics traditional art forms, and suggests 15 pen techniques and ways to display them by analyzing previous research on smart media. We have described the process of using hatching patterns and resused to solve lag problems that occur during the reproduction of pen techniques due to the limitations of smart devices and organized the conversion process of pen patterns into 4 steps: rough sketch, contrast, applying and mimicking patterns, and applying color. We hope that this research on the reproduction of analog pen techniques can be used as an example for production on fused surreal rendering.

• The Korean Journal of Food & Health Convergence
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• v.6 no.5
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• pp.11-17
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• 2020

This study tried to analyze sensual properties by classifying the thermal water extract of the main material used in Ssanghwa tea. Through this study, we wanted to develop popular Ssanghwa tea and further carry out basic research for the development of various menus using it. The ingredients for the Ssanghwa tea were washed under running water, then dehydrated and put in a pot as 2L of purified water. Ssangwha tea were heated at 100℃ for 10 minutes, then lowered the temperature to 75℃ and boiled down to 200 ml for 110 minutes. This study evaluated sensory characteristics of four types of commercial products and the five types manufactured by the description analysis. Quantitative analysis of the commercial Ssanghwa tea showed significant differences between samples in seven of the total 13 sensory characteristics except OG(Smell of grass), OC(Oriental medicine smell), TG(Umami), RT(Thick), RC(Rough) and RS(Tub-Tub) (p<0.05). In particular, differences between samples were evident in CT(Transmittance), CB(Brownness), TW(Sweet taste) and TB(Bitter) (p<0.001), which appeared to be the main differentiated features of appearance, aroma and taste for commercial Ssanghwa tea. This study tried to analyze sensual properties by classifying the thermal water extract of the main material used in Ssanghwa tea. Through, we wanted to develop popular Ssanghwa tea and further carry out basic research for the development of various menus using it.

• Convergence Security Journal
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• v.18 no.2
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• pp.89-99
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• 2018

In the year 2018, South Korea faces a crucial decision with regard to reunification. Starting from inter-Korean and US-North summits held from April through June, A rough journey for North Korea's "Complete, verifiable and irreversible dismantlement" began. Although South Korea insists that North Korea's Nuclear 'CVID' is the only minimum condition in the process of peaceful reunification, North Korea and other countries who support North Korea, including China and Russia, will possibly claim that North Korea's Nuclear 'CVID' will minimize their political and military positions internationally. Despite representatives from each country agreeing to North Korea's denuclearization, it is inevitable that many challenges still need to be resolved during the process. From the perspective of the Chinese government, North Korea is not a country that stimulates international conflicts. Instead, China can utilize North Korea as their political and tactical leverage against the US in order to compete for hegemonic power in Asia. In order to reject the emerging supremacy of China and resolve uncertainties in the denuclearization agreement and implementation process, I suggest the necessity of 'Korea-Japan Security Cooperation' as a 'second alternative' to achieve the North Korea's Nuclear 'CVID'.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.5
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• pp.899-908
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• 2022

In this study, a study was conducted to localize a large aluminum turbo fan used for tank powerpack. The turbo fan was scanned with a 3D scanner and then 3D modeling was performed. Computational fluid dynamics (CFD) were performed from the performance conditions of the fan, and structural analysis was performed using the pressure data obtained from CFD. The fan was reduced to 1/5 size by applying the geometric similarity. A 1/5 size fan has a honeycomb structure inserted into the front shroud and back shroud to reduce the weight by 5.3%. A 1/5 size fan was printed using a PBF 3D printer, and a 1/5 size fan with honeycombs was also printed. The pressure drop of 8.67 kPa and the required power of 138.19 kW, which satisfies the performance conditions of the fan, were confirmed from the results of CFD. The values of the maximum deformation amount of 0.000788 mm and the maximum effective stress of 0.241 MPa were confirmed from the structural analysis results. The fan printed by the PBF 3D printer had the same shape as the modeling, and the shape was perfect. There are no defects anywhere in appearance. However, the condition of the outer surface of the fan's back shroud is rough compared to other locations. The fan in which the honeycomb was inserted was also perfectly output, and the shape of the honeycomb was the same as the modeling.

• Convergence Security Journal
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• v.24 no.2
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• pp.123-132
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• 2024

In the era of the Internet of Things, 7 billion diverse devices have been interconnected worldwide. Ensuring information security across these varied devices is crucial in this hyper-connected age. To achieve essential security functions such as confidentiality, integrity, and authentication, it is imperative to implement true random number generators (TRNGs). Therefore, this study proposes a method to rapidly characterize the randomness of TRNGs. While there are international standards for formally characterizing the randomness of TRNGs, adhering to these standards often requires significant time and resources. This study aims to help TRNG developers enhance efficiency in both time and cost by characterizing rough randomness and unpredictability. Firstly, we propose applying auto-correlation and cross-correlation metrics for analog signals. Secondly, we suggest adopting joint entropy and mutual information metrics for digital signals.