PURPOSES : The objectives of this study are to evaluate the condition of concrete bridge decks using the multi-channel ground penetrating radar (GPR) testing and compare the value of its dielectric constant value with actual concrete condition. METHODS : The reflection coefficient method was used to measure the dielectric properties of concrete bridge decks. Air-coupled step-frequency GPR testing was used to measure the time taken for reflection from the interfaces between the layers. Specimens of the asphalt mixture and concrete bridge-deck were collected by field coring. GPR testing was conducted on two bridges with different concrete bridge deck conditions on national highways. After the GPR tests, the actual conditions of the concrete bridge deck were investigated using specimen coring. RESULTS : GPR testing indicated that the dielectric constants of concrete bridge decks in good condition ranged from 8 to 10, whereas those corresponding to poor condition ranged from 4 to 6. The results of GPR testing can determine the actual condition and degree of distress of concrete bridge decks determined from the specimen coring data. Therefore, GPR testing is appropriate for nondestructively evaluating the condition of a concrete bridge deck. CONCLUSIONS : The analysis results of the dielectric constants of the concrete bridge deck obtained from multichannel GPR testing were consistent with the actual bridge deck conditions. In the near future, an additional verification process for this approach under different bridge conditions will be required to improve its precision and ensure reliability.

아날로그TV 방송 시대에는 Mono/Stereo 오디오 방송과 음 성다중방송이 있었고, 디지털HDTV 방송 시대에는 Dolby AC-3 기술에 의한 5.1채널 입체오디오 방송이 추가 서비스로 이루어졌다. 지금의 4K-UHDTV 방송 시대에는 채널기반 오디 오(Channel-Based Audio) 7.1.4채널 입체오디오 방송을 비롯하 여 객체기반 오디오(Object-Based Audio) 기본방송 및 편파방 송과 해설방송 등 유저의 선택과 맞춤형 방송이 가능하고, 장 면기반 오디오(Scene-Based Audio) 몰입형 공간수음효과 3D 입체음향 방송 등이 MPEG-H 기술에 의해 활용될 수 있다. 본 논문은 국내 UHDTV 방송 전송방식(ATSC 3.0)과 함께 Audio 규격으로 규정된 MPEG-H 기술 응용에 대한 실험을 통 해 오디오 서비스 개발의 가능성을 연구하는데 그 목적을 두고 있다. 이러한 연구를 위해 ‘2022 카타르월드컵’ 기간 중 카타르와 SBS 간 전송링크 구간의 국제신호(IS) 현장음 및 SBS 아나운 서와 해설자 음성 전송용 음향채널 오디오를 소스로 사용하였 으며, 객체기반의 기본, 해설, 현장, 집중 4가지 오디오 모드를 구성하여 SBSi 채널을 통해 모바일 스트리밍 전송을 하였다. 그리고 수신은 SBS 모바일 앱에 Decoder를 설치하여 유저의 음향모드 선택과 활용 및 향후 MPEG-H 기술에 의한 다양한 형태의 오디오 서비스 개발의 가능성을 실험하였다.

This research not only determined the preference of fashion brand distribution channels of active Korean and Chinese seniors who became major consumers in the fashion industry, but also analyzed the effect on these preferences and choices of distribution channels depending on personal consumption characteristics and differences between the two groups. Data was collected by a professional survey firm. SPSS 24.0 and AMOS 24.0 were used for empirical analysis, and frequency analysis, multiple response analysis, EFA, reliability analysis, CFA, SEM, and multiple-group comparison analysis were performed. As a result of multiple response analysis, the offline channel was revealed as the preferred fashion distribution channel for active Korean and Chinese seniors; the second most popular was the online channel. The results of multiple-group comparison analysis reveal differences between two groups in seeking emotional consumption via the offline channel; the effect was only evident for active Korean seniors. A difference in seeking emotional consumption via preference for online channel also existed, but only for active Chinese seniors. For these reasons, marketers targeting active Korean seniors will be effective to not only offer brand information by fashion display to let seniors understand the fashion brand, but also to have brand events to form positive emotions toward the fashion brand. Moreover, targeting active Chinese seniors will be necessary to transmit brand sensibility by utilizing metaverse marketing comprising various factors, so that consumers can enjoy the fashion brand.

Recently in Korea, YouTube stock channels increased rapidly due to the high social interest in the stock market during the COVID-19 period. Accordingly, the role of new media channels such as YouTube is attracting attention in the process of generating and disseminating market information. Nevertheless, prior studies on the market forecasting power of YouTube stock channels remain insignificant. In this study, the market forecasting power of the information from the YouTube stock channel was examined and compared with traditional news media. To measure information from each YouTube stock channel and news media, positive and negative opinions were extracted. As a result of the analysis, opinion in channels operated by media outlets were found to be leading indicators of KOSPI market returns among YouTube stock channels. The prediction accuracy by using logistic regression model show 74%. On the other hand, Sampro TV, a popular YouTube stock channel, and the traditional news media simply reported the market situation of the day or instead showed a tendency to lag behind the market. This study is differentiated from previous studies in that it verified the market predictive power of the information provided by the YouTube stock channel, which has recently shown a growing trend in Korea. In the future, the results of advanced analysis can be confirmed by expanding the research results for individual stocks.

The purpose of this study is to reveal and compare the differences in the types and characteristics of purchase channel journeys of MZ generation consumers. In this study a survey was conducted on the purchase channel journey of 20 women in the MZ generation using the ethnographic method of in-depth interviews and observations. As a result, three purchase channel journeys were identified: mobile, multi-channel, and offline. These were variously subdivided according to the characteristics of the MZ generations. Gen Z’s journey was categorized into types: fashion platform app, Youtube, multi-channel supplement, multi-channel non-planned store visit, offline loyalty store, and impulsive offline store. Gen M’s journey was categorized as: an online community bond, portal site, online loyalty store, multi-channel brand involvement, multi-channel efficiency, a multi-channel conversion, offline efficiency and offline task. The difference in mobile journey between generations was found in the time and length of the purchase. Gen M recognized both online and offline search processes to be tiring, while Gen Z enjoyed the search process using the online path. In the offline journey Gen Z began with their own intention to purchase, while Gen M sometimes recognized that purchasing fashion products necessary for work was a cumbersome task.

The development of ICT technology has created new channels for product sales and promotion, which not only make information accessible to customers as easy as possible, but also provide consumers with much more absolute and comparative information. Modern consumers are exposed so many shopping channels currently, especially mobile-based channels have grown significantly and have become the center of the market. It is true that mobile shopping has led the growth of overall online shopping with the recent development of mobile devices such as smartphones and related software. The importance of strengthening corporate competitiveness and mobile-based management strategies through on line channels continues to increase. At this point, this study attempted to investigate the influencing factors by focusing on the entire distribution channel and mobile shopping channels. As most of previous studies were focused on Internet shopping malls or specific channels, So the research on mobile channels can be judged to be timely and appropriate. Furthermore, it can be said that mobile shopping channels are now presenting empirical implications. In conclusion, it provides practical implications to examine the management strategy of mobile shopping channels from the perspective of consumer value.

The purpose of this study is to analyze information about dietary information presented in the television broadcast media in order to determine the optimal communication method that will provide desirable information to the general public. To that end, stakeholders were recruited and trained before and during the study. Three airwaves broadcasters and four comprehensive programming channels were monitored for Three months. The results are as follows. In total 172 food and nutrition programs are reported on. As information from the monitored programs was investigated, results showed a frequency of 136 separate informative programs (79.1%) and 36 entertainment programs (20.9%). Second, the broadcasters included are KBS, MBC, SBS, while the channels are TV Chosun, JTBC, Channel A, and MBN. Third, 109 reports (63.3%) were about ingredients & cuisine, followed by 63 reports (36.7%) on health and diet. This research provides transitional knowledge regarding the correlation between dietary information and the media. Moreover, this research contributes to advocating public health by enhancing the quality from broadcast media about dietary information.

본 연구는 피레스로이드계 살충제인 퍼메트린이 Heliothis virescens의 중추신경세포의 나트륨채널에 어떻게 작용하는 가를 전기생리학적으 로 관찰하였다. 퍼메트린은 나트륨채널의 꼬리전류(INa-tail)를 지속적으로 증가시켰으며 이러한 비정상적인 나트륨 전류증가가 나방류의 신경계에 과도한 흥분을 일으겨 살충작용을 하는 것으로 생각된다. 이러한 살충작용은 전갈독과 함께 사용했을때 약 8배의 증가가 있었음을 확인하였다. 전 갈독이 살충제의 독성을 강화하는 분자생리학적 기전연구가 계속되면 해충방제에 많은 기여를 할 것으로 생각된다.

The purpose of this study is to examine children's YouTube contents that intensively show the characteristics of a promotional society from the perspective of critical discourse studies. This starts to view of the concept of discourse as ‘use of language in a social context’. Discourse can be approached in terms of texts, discourse practices, and sociocultural practices. And the analysis was carried out within the dialectical relationship of these three dimensions. Children's YouTube discourse superficially pursues an entertainment genre, but has the characteristics of an advertising genre. The discourse practice of YouTube text makes it natural to watch a commercial presented before watching main contents. In addition, it commercializes play activities between parents and children in the home domain. Representing ‘play’ and ‘home’ at the text level as excessively abundant goods is related to ‘discourse on happiness through material’. In terms of discourse practices, the value of the play activities of parents and children as media products, and the guarantee of (advertising) viewing act for consumption of these texts, is based on the characteristics of the promotion and consumption society. Capturing the ideology of fetishism that penetrates these three dimensions contributes to the recognition of the act of watching as labor.

In this study, a rocking behavior experiment using a guide plate and a guide channel to prevent lateral deformation of a steel damper was planned. For this purpose, strut I-type specimen I-1 and strut S-type specimen S-1 were prepared. The experimental results were compared with the existing experimental results of SI-260 and SS-260 under the same conditions without the details of lateral deformation prevention in order to evaluate the effect of preventing lateral deformation. The damper with lateral deformation prevention detail was evaluated to have superior strength capacity, deformation capacity, and energy dissipation capacity than the damper without it. Therefore, the lateral deformation prevention detail was evaluated to have a good effect in improving the design capability of the steel damper.

다채널 소매상은 전자상거래의 발전에 의거하여 점차 형성되었다. 정보기술의 발전이 점차 다채널 소매상의 온라인 및 오프라인의 통합 마케팅에 관심을 가지게 된다. 이 과정에서 다채널소매상은 온라인 및 오프라인의 통합, 마케팅 및 정가 등 문제에 직면한다. 본문은 4Ps 마케팅 이론 및 구조방식 모델 구축에 근거하여 다채널 소매상의 오프라인 및 온라인 협동마케팅에 영향을 미치는 원인을 출발점으로 삼아, 제품·가격·마케 팅과 서비스가 온라인 및 오프라인 합동마케팅에 대한 영향을 상세하게 분석하여, 상대적으로 합리적인 마케팅전략을 세워야한다. 4개요소 중 영향이 제일 큰 게 가격이고 그 다음은 제품· 세일과 서비스이다. 제품의 품질이 높으면 높을수록 가격도 높아지고, 세일마케팅이 어느 정도는 소비자의 구매를 촉진시킬 수 있으며, 서비스도 소비자의 구매의향을 어느정도 증가시킬 수 있다. 그러므로 다채널 소매상이 온라인 및 오프라인 마케팅전략을 세울 시 합동 마케팅을 견지하고 제품품질과 가격선 정 전략을 방향으로 하되 세일과 서비스는 보조로 진행하여 소비자의 구매의향을 높여야 한다. 본문의 연구방법과 연구결과는 다채널 소매상의 온라인 및 오프라인 마케팅 전략연구에 방법 참고와 이론 근거를 제공한다. 동종업자 기업이 마케팅전략을 세우는데 참고가 되었으면 하는 바램으로 동종업자의 양성 발전에 촉진시키는데 도움이 되기를 바란다.

KAERI has planned to carry out a series of dynamic tests using a shaking table and time-history analyses for a channel-type concrete shear wall to investigate its seismic performance because of the recently frequent occurrence of earthquakes in the south-eastern parts of Korea. The overall size of a test specimen is ×× 2500 mm×3500 mm×4500 mm, and it consists of three stories having slabs and walls with thicknesses of 140 mm and 150 mm, respectively. The system identification, FE model updating, and time-history analysis results for a test shear wall are presented herein. By applying the advanced system identification, so-called pLSCF, the improved modal parameters are extracted in the lower modes. Using three FE in-house packages, such as FEMtools, Ruaumoko, and VecTor4, the eigenanalyses are made for an initial FE model, resulting in consistency in eigenvalues. However, they exhibit relatively stiffer behavior, as much as 30 to 50% compared with those extracted from the test in the 1st and 2nd modes. The FE model updating is carried out to consider the 6-dofs spring stiffnesses at the wall base as major parameters by adopting a Bayesian type automatic updating algorithm to minimize the residuals in modal parameters. The updating results indicate that the highest sensitivity is apparent in the vertical translational springs at few locations ranging from 300 to 500% in variation. However, their changes seem to have no physical meaning because of the numerical values. Finally, using the updated FE model, the time-history responses are predicted by Ruaumoko at each floor where accelerometers are located. The accelerograms between test and analysis show an acceptable match in terms of maximum and minimum values. However, the magnitudes and patterns of floor response spectra seem somewhat different because of the slightly different input accelerograms and damping ratios involved.

The longest process in the injection molding process is the cooling process of the molded product. Therefore, shortening the cooling time is key to reducing the injection molding cycle time. For fast cooling time, the production of conformal cooling channels using metal 3D printing instead of the conventional linear cooling channels is continuously increasing. In this study, the cooling effect of the conventional linear cooling channel application and the conformal cooling channel application using metal 3D printing was compared in the design of the back cover molding mold of the circulator that has been widely used recently. The comparison of the cooling effect was based on the mold temperature and the molded product temperature for a certain period of time after completion of molding. It was confirmed that the time required to eject from the mold with the conformal cooling channel to the ejecting temperature of the molded product was reduced by 28.7%, and the maximum temperature of the mold was also reduced by 40%.

The effect of flow direction on heat transfer in water cooling channel of lithium-ion battery is numerically investigated. Battery Design StudioⓇ software is used for modeling electro-chemical heat generation in the battery and the conjugated heat transfer is analyzed with the commercial package STAR-CCM+. The result shows that the maximum temperature and temperature difference of battery with Type 1 are the lowest because the heat transfer in the entrance region near the electrode is enhanced. As the inlet velocity is increased, the maximum temperature and temperature difference of battery decreases but the pressure loss increases. The pressure loss in Type 2 channel is the lowest due to the shortest channel length, while the pressure loss with Type 3 or 4 channel is the highest because of the longest channel length. Considering heat transfer performance and pressure loss, Type 1 is the best cooling channel.

본 연구는 국내 유튜브 채널에 업로드된 실용음악 미디 작·편곡 강의 콘텐츠의 전체적인 흐름 및 구성요소를 파악하여 발전방안을 제시했다. 연구 방법은 실용음악 미디 작·편곡 강의 콘텐츠를 제공하는 국내 유튜브 채널 중 여섯 개를 선정하여, 916개의 실용음악 미디 작·편곡 강의 콘텐츠를 비교·분석하였다. 분석 기준은 교수자의 출연 여부, 학습 목표 제시 여부, 강의 영상의 길이, 자막 활용 여부, 기타 미디어 자료 활용 여부, 보충자료 제공 여부, 상호작용의 여부, 관리의 여부 총 여덟 가지이다. 이를 통해 실용음악 미디 작·편곡 강의 콘텐츠를 제공하는 국내 유튜브 채널의 현황 연구 자료를 제시했고, 그로부터 시사점을 도출하여 향후 제작될 유튜브 실용음악 미디 작·편곡 강의 콘텐츠의 발전방안을 다음과 같이 제시하였다. 첫째, ‘강의 콘텐츠 내 교수자의 출연 여부와 상관없이 질적인 강의 콘텐츠 제공이 필요하다.’ 둘째, ‘함축적 주제어를 통한 명확한 학습 목표 및 주제 제시가 필요하다.’ 셋째, ‘학습자의 학습 효율성 및 집중도를 고려한 강의 콘텐츠 길이가 중요한 요소가 될 수 있다.’ 넷째, ‘교수 내용을 시각적으로 보충하기 위해 적극적인 자막 활용이 필요하다.’ 다섯째, ‘학습자의 학습 효율을 높이기 위해 다양한 미디어 자료의 활용이 필요하다.’ 여섯째, ‘교수자와 학습자 사이의 거리를 가깝게 하기 위한 적극적인 상호작용이 필요하다.’ 일곱째, ‘학습자의 학습성과를 높이기 위한 보충자료의 제공이 필요하다.’ 마지막으로 여덟째, ‘채널에 대한 지속적인 콘텐츠 업로드 및 관리가 중요하다.’ 유튜브 기반 실용음악 미디 작·편곡 강의 콘텐츠에 관한 연구가 부족한 상황에서, 본 연구에서 도출된 결과를 참고하고 적용한다면 추후 제작될 콘텐츠의 개선에 도움이 될 수 있으며 더욱 유용한 학습 자료로 활용될 수 있다는 가능성을 제시하였다.

본 연구에서는 생체모방형 비대칭 분리막 제조방법인 사각펄스양극산화법의 비대칭성 한계를 극복하기 위해 최근 보고된 셀렌산 전해액을 이용하고 표면개질에 따른 정류특성을 평가하였다. 분리막의 비대칭 원뿔형 채널은 최소직경이 10 nm이고 최대직경이 50 nm이며 길이가 5 μm이었다. 분리막의 정류특성은 기존 황산 전해액에서 제작된 것보다 높았으며 +1 V에서의 전류가 -1 V일 때보다 최대 2.9배를 나타내었다. 또한, 실란화 반응을 이용한 표면개질을 통해 술폰산기를 도입한 분리막은 반대로 -1 V에서의 전류가 +1 V일 때보다 전류의 최대 4.2배인 정류특성을 나타냈다. 실험에 대한 이론적 증명은 2D 모델에 수치해석 결과를 제시함으로써 뒷받침되었다. 본 연구의 결과는 서로 다른 정류방향을 갖는 두 종류의 이온 정류 분리막을 손쉽게 제작할 수 있는 방법을 제시하며 이온의 이동을 제어하기 위한 다양한 연구 분야에 활용될 수 있을 것으로 기대된다.

앵커채널은 건축 외장재 등을 쉽고 안정적으로 고정하는데 적합하여 철근콘크리트 구조물의 연결 구성요소에 적용되고 있다. 선설치 앵커채널은 천공 중 콘크리트 보강재를 손상시키지 않으며, 현장용접 등에 의한 손상을 최소화 하는 장점이 있다. 본 연구에서는 원형앵커와 I형 앵커를 적용한 앵커채널의 인장 및 전단 거동을 실험적으로 평가하였다. 연단거리 및 피복철 근 및 앵커형상에 따른 앵커채널의 인장 및 전단강도 평가를 위하여 인장 및 전단실험을 실시하였다. 시험 결과, 원형앵커의 인장강도는 I형 앵커보다 증가하는 경향이 나타났다. 그리고 콘크리트에 매립된 앵커의 기하학적 형상, 피복철근 유무 및 연단거 리에 따라 비교한 결과, I형 앵커의 전단강도가 원형앵커보다 약 55% 낮은 것을 알 수 있었다.