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Taeyang Ban,Daehyeon Kim,Jongki Choi,Jungbok Lee,Hajin Song,Eunju Kim,Ahreum Lim,Soohwan Kim,Jungsuk Oh 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Radionuclide analysis methods must be secured in the event of emergencies such as the discovery of unknown nuclear material or nuclear accidents in neighboring countries or Korea. Most institutions in Korea are in their early stages of radionuclide analysis method development and do not even have Radiation Controlled Areas where they can handle the samples safely. Some institutions such as the Korea Atomic Energy Research Institute have the ability to perform radionuclide analysis for nuclear facilities or verification of nuclear activities. In Korea, it is necessary to secure nuclide analysis technology to enable independent verification in times of emergency or need. This paper analyzes uranium as the target nuclide using alpha spectrometer and TIMS. Alpha spectrometer detects alpha particles emitted from uranium samples and measures the concentration of uranium isotopes. This method has a high selectivity that distinguishes it from other elements, and accurate measurements can be made even when uranium samples are mixed with other elements. In addition, there is minimal interference from other radioactive isotopes in the sample, and the sample preparation is simple, resulting in relatively short analysis times. In contrast, TIMS detects ionized uranium ions by heating the uranium sample. This method may have potential interference from other elements and may take relatively longer analysis times. However, TIMS has high sensitivity and accuracy and can detect various elements other than uranium, making it suitable for various analyses. Therefore, when analyzing uranium, it is recommended to select and use the appropriate device according to the purpose, as both alpha spectrometer and TIMS have their pros and cons. Furthermore, by using both devices in parallel, more accurate and reliable results can be obtained. This paper aims to compare the analysis methods of alpha spectrometer and thermal ionization mass spectrometry, which are widely used for nuclide analysis in unknown nuclear materials.
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Choi, Jinwoong,Kim, Hyunjoo,Do, Taeyang,Moon, Junsoo,Choe, Youngson,Kim, Jeung Gon,Bang, Joona John WileySons, Inc. 2019 Journal of polymer science Part A, Polymer chemist Vol.57 No.6
<P><B>ABSTRACT</B></P><P>Bottlebrush polymers (BBPs) are three‐dimensional polymers with great academic and industrial potential owing to their highly tunable and intricate architecture. The most popular method to synthesize BBPs is ring‐opening metathesis polymerization (ROMP) with Grubbs' catalyst, allowing living grafting‐through polymerization of macromonomers of up to ultrahigh molecular weights with narrow molecular weight distribution. In this case, it has been well recognized that the purity of macromonomers (MMs) is critical for a successful ROMP reaction. For MMs synthesized from reversible‐deactivation radical polymerization, Grubbs and Xia demonstrated that the better control of ROMP reaction can be achieved when they are prepared via “growth‐then‐coupling” method that is coupling a norbornenyl group to end‐functionalized prepolymers. However, these MMs can also contain various residual impurities from previous synthetic steps, which can potentially poison the catalyst and hamper the ROMP reaction. Herein, we intentionally doped possible impurities into purified MMs to identify the most poisoning species. As a result, it was found that alkyne‐functionalized norbornene most significantly retarded the ROMP reaction due to a formation of Ru‐vinyl‐carbene intermediates having low catalytic reactivity, whereas the other reagents such as solvent, Cu‐catalyst, ligands, and azido‐terminated prepolymers were relatively inert. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <B>2019</B>, <I>57</I>, 726–737</P>
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박태양 ( Taeyang Park ),김성재 ( Sungjae Kim ),김성민 ( Sungmin Kim ),장정렬 ( Ryeol Jang ),최강원 ( Kang Won Choi ),김상민 ( Sangmin Kim ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
현대 사회에 들어 인간의 개발로 인해 토양침식의 가중으로 인해 많은 토사유출이 발생하고 있으며 그 규모가 급격히 증가하게 되고 있다. 토양침식으로 인한 토사유출은 하류의 댐, 저수지, 수로 등의 수리구조물에 퇴적되어 내용적과 통수능력을 감소시키게 되며 하천의 유사농도를 높이고 밭이나 논에서 배출된 토사의 경우 비료나 농약성분과 함께 유실되어 호수의 부영영화를 발생시키거나 하천의 수질문제를 일으키게 된다. 이과 같이 토사 유출등의 개발로 인해 발생되는 인명과 재산 피해와 같은 재해를 최소화하기 유출증가와 홍수부담 가중을 유발시키는 원인행위를 사업이 시행되기 이전에 검토하는 재해영향평가제도가 시행되고 있고 그를 위해 침사지나 저류지등의 저감시설의 설치를 의무화 하고 있다. 경사지에서 발생되는 토양침식으로 인해 발생되는 문제는 실측을 통해 하류나 호소의 영향을 구명하는 것이 바람직하나 이는 많은 경비와 시간을 필요로 하게 되고 결과 또한 강우, 토질, 경사도, 재배작물, 경사면의 길이나 방향등 무수히 많은 변수들로 인해 지역에 따라 다른 경향을 나타내게 된다. 따라서 토양침식을 모의할 수 있는 모형을 이용하게 되면 실측을 통한 토사유출의 영향을 분석하는 방법의 단점을 보완할 수 있으며 이를 통한 저감대책을 강구할 수 있고 그 중 유출량 산정하는 기법에는 경험적 산정기법, 물리적 산정기법 그리고 기타기법으로 분류되고 있으며 경험적 산정기법에 근거한 대표적인 모형으로 RUSLE(Revised Universal Soil Equation)모형이 있으며, 물리적 산정기법에는 WEPP(Water Erosion Prediction Project), ANSWERS(Areal Nonpoint Source Wetershed Environment Response Simulation), EPIC(Erosion Productivity Impact Calculator)모형 등이 있다. 그 외 기타기법으로는 원단위법과 비유사량법 등이 사용되고 있다. 본 연구에서 토사유출을 예측하기 위해 현대 수문학, 침식 과학 등을 기반으로 개발된 모형으로 유출량뿐만 아니라 단일경사지나 유역 출구로부터 배출되는 토사유출량을 산정할 수 있는 WEPP모형을 이용하여 시험포장의 유출량과 토사유출량을 모의하여 실측치와의 비교를 통해 WEPP의 적용성을 평가하고 오염저감시설이나 경작상태등에 따른 변화를 비교 분석하였다.
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Evaluation of TV commercials using neurophysiological responses
Yang, Taeyang,Lee, Do-Young,Kwak, Youngshin,Choi, Jinsook,Kim, Chajoong,Kim, Sung-Phil BioMed Central 2015 Journal of Physiological Anthropology Vol.34 No.1
<P><B>Background</B></P><P>In recent years, neuroscientific knowledge has been applied to marketing as a novel and efficient means to comprehend the cognitive and behavioral aspects of consumers. A number of studies have attempted to evaluate media contents, especially TV commercials using various neuroimaging techniques such as electroencephalography (EEG). Yet neurophysiological examination of detailed cognitive and affective responses in viewers is still required to provide practical information to marketers. Here, this study develops a method to analyze temporal patterns of EEG data and extract affective and cognitive indices such as happiness, surprise, and attention for TV commercial evaluation.</P><P><B>Methods</B></P><P>Twenty participants participated in the study. We developed the neurophysiological indices for TV commercial evaluation using classification model. Specifically, these model-based indices were customized using individual EEG features. We used a video game for developing the index of attention and four video clips for developing indices of happiness and surprise. Statistical processes including one-way analyses of variance (ANOVA) and the cross validation scheme were used to select EEG features for each index. The EEG features were composed of the combinations of spectral power at selected channels from the cross validation for each individual. The Fisher’s linear discriminant classifier (FLDA) was used to estimate each neurophysiological index during viewing four different TV commercials. <I>Post hoc</I> behavioral responses of preference, short-term memory, and recall were measured.</P><P><B>Results</B></P><P>Behavioral results showed significant differences for all preference, short-term memory rates, and recall rates between commercials, leading to a ‘high-ranked’ commercial group and a ‘low-ranked’ group (<I>P</I> < 0.05). Neural estimation of happiness results revealed a significant difference between the high-ranked and the low-ranked commercials in happiness index (<I>P</I> < 0.01). The order of rankings based on happiness and attention matched well with the order of behavioral response rankings. In the elapsed-time analysis of the highest-ranked commercial, we could point to visual and auditory semantic structures of the commercial that induced increases in the happiness index.</P><P><B>Conclusions</B></P><P>Our results demonstrated that the neurophysiological indices developed in this study may provide a useful tool for evaluating TV commercials.</P>
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김태양(Taeyang KIM),유삼현(SamHyun YOO),김주희(Juhee KIM),이종우(Jongwoo Lee),최상경(Sangkyung CHOI) 육군사관학교 화랑대연구소 2014 한국군사학논집 Vol.70 No.3
둔감탄약은 포발사 환경에서 성능은 그대로 유지하면서 탄약의 폭발 취약성을 감소시켜 안전성을 향상시키고 수송, 저장 및 운용 시 사고나 피탄에 의한 피해를 최소화 시킬 수 있다. 이러한 둔감탄약 개발은 세계적인 추세로서 군 요구조건을 충족하면서 국외 수출경쟁력 확보를 위해 요구되고 있다. 본 연구에서는 이러한 선진국의 둔감탄약 시험 및 평가기준을 소개하고 한국군에 최적화된 둔감탄약의 기준을 제시하기 위해 도입한 QFD(=Quality Function Deployment) 기법의 적용방법을 자세히 소개하여 최종적으로 이를 바탕으로 한 한국군의 실정에 맞는 둔감탄약 기준을 설정하였다. Insensitive Munition(=IM) reduces the explosive weakness of munition with maintaining performances in the environment of discharge, which improves security and minimizes damages from accidents and being shot in case of transport, storage and operation. Development of IM has been the global trends, which was demanded to satisfy the requirement of military, prevent from the loss of non-battle and improve the export competitiveness, so that the necessity on the development of effective insensitive technique has been increased especially in power-enhanced munitions. In this study, we piled up voice of customer(=VOC) to set the standards for IM by using AHP(=Analytic Hierarchy Process), then end up with final standards for IM with QFD(=Quality Function Deployment).
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Suwoong Choi,Yunbin Lee,Taeyang Park,Sujin Hwang 물리치료재활과학회 2021 Physical therapy rehabilitation science Vol.10 No.1
Objective: To control the rate at which body weight drops, forefoot initiates floor contact with the limb relatively extended at each joint. However, when the knee joints could not extend enough with going down the stairs, the forefoot cannot be contact initially. The purpose of this study was to investigate the differences between forefoot and whole foot in initial contract on soleus and tibialis anterior for health young adults when descending stairs. Design: A cross-sectional observational study design. Methods: Fifteen healthy young adults participated in this study. To compare between forefoot and whole foot in initial contact when going down the stairs, this study measured muscle activation on soleus and tibialis anterior. This study used the paired t-test to analyze the collected data and compare the supporting conditions. Results: After analyzing, the muscle activation of soleus was not statistically significant difference as 25.16% at forefoot initial contact and 24.37% at whole foot initial contact when descending stairs (p>0.05). However, the muscle activation of tibialis anterior muscle was significantly difference was 49.19% at forefoot contact and 71.55% at whole foot contact. Conclusions: The results of this study was that the muscle activation of the tibialis anterior was a higher at whole foot contact than that at fore foot contact when descending stairs. This study suggests that the landing strategy of the initial contact is a beneficial effect at the forefoot contact to maintain the postural balance and the muscle performance effectively when descending stairs in individuals with healthy young adults.
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