• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.712-713
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• 2017

Clinically applicable light emitting diode (LED) has been widely investigated because of relatively low heat generation, low cytotoxicity, and non-invasiveness compared to other therapeutic methods. Therefore, we investigated the therapeutic effects of several wavelengths of light emitting diode against human cervical cancer cells and analyzed the individual inhibitory effect for the cancer cell proliferation. In the experiment, prepared HeLa cells were exposed by red, green and blue light-emitting diode for 10 minutes each. Relatively short-wavelength light-emitting diode (blue) showed stronger therapeutic effects than relatively long-wavelength light-emitting diodes.

• Aerospace Engineering and Technology
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• v.7 no.1
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• pp.99-107
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• 2008

The COMS is a kind of geostationary multi-functional satellites with three different mission objectives. Two of them aim at earth observation and the COMS has two optical payloads according to those missions. The payloads are composed of a meteo imager and an ocean color imager, and their inherent characteristics require optimal interface design for their performance to be concurrently achieved. Therefore, various kinds of constraints are considered in their component accommodation on the COMS platform. This paper shows a general overview of the optical payload accommodation design and describes the design consideration to achieve the optimized performance from thermal and mechanical point of view.

• Corrosion Science and Technology
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• v.20 no.2
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• pp.69-76
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• 2021

In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upper header of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage position in the tube was the location where the materials were easily vulnerable due to tensile residual stresses induced by the material manufacturing process and welding process. In addition to an imbalance in the module induced by temperature difference during operation of the pre-heater, the weight of the modules and thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage position of the pre-heater was exposed to the tensile stress on the inner surface of the tube facing the gas, which rendered the unstable oxide layer susceptible to corrosion and the formation of pits on the water side. The cracks propagated along with the degraded microstructure in a transgranular cracking mode under fatigue loading and finally resulted in water leakage.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.3
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• pp.79-88
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• 2008

On the internet, the NIDS(Network Intrusion Detection System) has been widely deployed to protect the internal network. The NIDS builds a set of rules with analysis results on illegal packets and filters them using the rules, thus protecting the internal system. The number of rules is ever increasing as the attacks are becoming more widespread and well organized these days. As a result, the performance degradation has been found severe in the rule application fer the NIDS. In this paper, we propose a multiple pattern matching scheme to improve rule application performance. Then we compare our algorithm with Wu-Mantel algorithm which is known to do high performance multi-pattern matching.

• Composites Research
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• v.16 no.1
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• pp.1-12
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• 2003

This study developed SiC$_{p}$/A1$_2$O$_3$$_{f}$/Al composites for electronic packaging to which reinforcements were added with the volume fractions of 49%, 56% and 63% by the squeeze casting method. 0.8 wt. % of the inorganic binder as well as the A1$_2$O$_3$ fiber and SiC Particles with the volume fraction of 1:10 were added to the composites, which were produced in the newly designed mold. For the produced SiC/Al composites, the CTEs (coefficients of thermal expansion) were measured from 30 to 300 and compared with the FEM numerical simulation to analyze the temperature dependent properties. The experiment showed the CTEs of SiC$_{p}$/A1$_2$O$_3$$_{f}$/Al composites that were intermediate values of those of Rule of Mixture and Turner's Model. The CTEs were close to Turner's Model in the room temperature and approached the Rule of Mixture as the temperature increases. These properties analyzed from the difference of the average stress acting between the matrix and the reinforcements proposed in this study.

• KIPS Transactions on Computer and Communication Systems
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• v.1 no.3
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• pp.143-150
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• 2012

A simulation methodology and corresponding program based on it is to be discussed for analyzing the effects of the networking operation of existing DHC system in connection with CHP system on-site. The practical simulation for arbitrary areas with various building compositions is carried out for the analysis of operational features in both systems, and the various aspects of thermal energy grids with connecting operation are highlighted through the detailed assessment of predicted results. The intrinsic operational features of CHP prime movers, gas engine, gas turbine etc., are effectively implemented by realizing the performance data, i.e. actual operation efficiency in the full and part loads range. For the sake of simplicity, a simple mathematical correlation model is proposed for simulating various aspects of change effectively on the existing DHC system side due to the connecting operation, instead of performing cycle simulations separately. The empirical correlations are developed using the hourly based annual operation data for a branch of the Korean District Heating Corporation (KDHC) and are implicit in relation between main operation parameters such as fuel consumption by use, heat and power production. In the simulation, a variety of system configurations are able to be considered according to any combination of the probable CHP prime-movers, absorption or turbo type cooling chillers of every kind and capacity. From the analysis of the thermal network operation simulations, it is found that the newly proposed methodology of mathematical correlation for modelling of the existing DHC system functions effectively in reflecting the operational variations due to thermal energy grids with connecting operation. The effects of intrinsic features of CHP prime-movers, e.g. the different ratio of heat and power production, various combinations of different types of chillers (i.e. absorption and turbo types) on the overall system operation are discussed in detail with the consideration of operation schemes and corresponding simulation algorithms.

• Journal of Radiation Protection and Research
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• v.29 no.3
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• pp.179-186
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• 2004

A single-dosimeter worn on the anterior surface of body of a worker was found to provide significant underestimation of dose to the worker when radiation comes from behind of the human body. Recently, several researchers suggested that this kind of underestimation can be corrected to a certain extent by using an extra dosimeter on the back. But this multiple dosimetry also has the disadvantages like overestimation lowering work efficiency or cost burden. In this study, a single dosimeter introducing asymmetric filters enabled to identify PA exposure was designed by monte-carlo simulation and experiments and its dose evaluation algorithm for AP-PA mixed radiation field was established. This algorithm was applicable to penetrating radiation which had the effective energy more than 100 keV. Besides, the dosimeter and algorithm in this study were possible to be applied to near PA exposure.

• Microbiology and Biotechnology Letters
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• v.31 no.4
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• pp.355-361
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• 2003

Immunostimulating effects of lactic acid bacteria as biological response modifier is a subject of growing interest, but the knowledge of these focused on some bacteria as Lactobacillus and Bifidobacterium. In this study, we investigated the effects of Pediococcus pentosaceus EROM101 on the immunostimulating and anti-cancer activity in murine model. P. pentosaceus was mainly found in Kimchi and fermented sea food and is facultatively anaerobic, catalase-netative, gram-positive cocci arranged in pairs, tetrads and clusters. The immunostimulating effects of P. pentosaceus EROM101 were evaluated using IgA production assay of Peyer's patch and proliferation assay of exudated immune cells of Balb/C mice fed P. pentosaceus EROM101 for 3 weeks. The macrophage and splenocyte proliferation were enhanced by orally administrated of P. pentosaceus EROM101. Also, IgA production in Peyer's patch increased by P. pentosaceus EROM101. Anti-cancer activity of P. pentosaceus EROM101 was appeared in Sarcoma 180 tumor-bearing ICR mice. However, this bacterium lysate itself appeared to have noncytotoxic substance against Sarcoma 180 cell in vitro. These results suggested that P. pentosaceus EROM101 reinforce immune system and therefore was revealed to be anti-cancer activity in mice.

• Journal of the Korean Geotechnical Society
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• v.37 no.2
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• pp.5-17
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• 2021

The Moon has been an attractive planet as an outpost for deep space exploration since He-3 and water ice which can be used as energy resources were discovered. In-Situ Resource Utilization (ISRU) construction material fabrication method is required for sustainable space planet exploration. In this paper, the possibility of microwave sintering technology for construction material fabrication was evaluated using lunar regolith that can be easily collected from the Moon surface. Experimental assessment of the influence factors on microwave sintering was conducted using a hybrid sintering system for efficient processing. The heat distribution in the furnace was observed using thermal paper that is coated with a material formulated to change color when exposed to heat. Based on this result, sintered cylindrical KLS-1s with a diameter of 1 cm and a height of 2 cm were fabricated. Densities were measured for the sintered KLS-1s under rotating turntable conditions that have an effect of microwave dispersion. The more dielectrics were arranged, the more microwaves were dispersed reducing the heat concentration, and thus a uniformity of sintered KLS-1s was enhanced.

• KDI Journal of Economic Policy
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• v.16 no.2
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• pp.51-89
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• 1994

본(本) 논문(論文)은 졸고(拙稿)(1989)에 이어 정부규제(政府規制)의 폐해가 특히 심각한 방송광고산업(放送廣告産業)에 초점을 두고 한국방송광고공사(韓國放送廣告公社)(KOBACO)라는 규제기구(規制機構)가 중심이 된 각종 규제(規制)의 쟁점(爭點)을 분석한 결과, 대부분의 규제(規制)가 폐지 혹은 완화되어 방송광고(放送廣告)의 시장기능(市場機能)이 활성화(活性化)되어야 함을 주장하고 있다. 조속(早速)한 시일내(時日內)에 규제개선(規制改善)이 필요한 정책과제(政策課題)는 방송광고시간규제(放送廣告時間規制)의 단계적 완화, 토막광고규제(廣告規制)의 단순화, 중간광고(中間廣告)의 허용, CATV 등 신규방송매체(新規放送媒體)의 확충, 규제요금(規制料金)의 단계적 인상, 매체별(媒體別) 시급구분(時級區分)의 자율성 확대를 통한 요금체계(料金體系)의 합리화, "rotation time"제(制) 도입, KOBACO의 수탁수수료(受託手數料) 폐지, 민간대행수수료(民間代行手數料)의 인상, 계열(系列) 비계열(非系列)의 수수료차별화(手數料差別化) 폐지, 복수대행(複數代行)자유화, 한국언론회관(韓國言論會館)의 정부광고독점대행권(政府廣告獨占代行權) 폐지, 방송광고사전심의제(放送廣告事前審議制) 폐지, 매체(媒體)의 대행사(代行社) 소유(所有) 지배(支配) 경영(經營) 차단 등이다. 한편 시청률조사(視聽率調査), ABC 등의 조기정착과 광고산업에 대한 공정거래법(公正去來法)의 적용 등은 시장기능(市場機能)의 전제(前提)가 되는 정책과제로서 제시되었다. 또한 KOBACO 독점대행권(獨占代行權)의 완전폐지, 방송광고요금(放送廣告料金)의 완전자율화, 시간규제(時間規制)의 추가적 완화 등은 이러한 규제개선을 완결시키는 과제로서 제시되었다. 본(本) 논문(論文)은 이러한 정책과제가 효율적으로 추진되려면 경제행정규제완화위원회(經濟行政規制緩和委員會)와 공정거래위원회(公正去來委員會)가 중심기구가 되어야 함을 강조하였다. 규제기능이 사라진 KOBACO의 위상변화는 본(本) 논문(論文)이 고려하지 않았던 지출기능(支出機能)의 평가에 따라 결정될 것이지만, 규제폐지에 관한 한 그 존재의의는 사라진다.