• 한국운동역학회지
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• 제31권3호
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• pp.214-219
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• 2021

Objective: The aim of this study was to evaluate the differences in muscle activity of hamstring muscle depending on the position of the feet during Swiss ball hamstring curl exercise. Method: Total of 15 male participants with no history of hamstring muscle injuries and musculoskeletal disorders in the past 6 months were participated in this study (Age: 29.27 ± 4.96 yrs, Height: 173.47 ± 5.18 cm, Body mass: 75.47 ± 12.50 kg). The muscle activation of semitendinosus and biceps femoris with four different feet positions including neutral stance, internal rotation, external rotation, and wide stance were measured during a Swiss ball hamstring curl exercise. For the analysis, the Swiss ball exercise movement comprised of 3 events (90°→ 0°→ 90°) based on the knee angle and 2 phases relative to the mechanism of muscle contraction (eccentric/concentric contraction). To pursue the study goal, an one-way ANOVA with repeated measures was performed with statistical significance as α = 0.05. Results: There was no statistically significant feet position effect found during the Swiss ball hamstring curl with eccentric contraction phase (p>.05). It is, however, semitendinosus showed an enhanced muscle activation in concentric contraction phase, displaying the highest muscle activity in wide stance and the lowest in external rotation (p<.05). Conclusion: Our findings suggest that this exercise can be beneficial in selectively training the semitendinosus. In other words, Swiss ball hamstring curls performed in wide stance strengthens semitendinosus, which improves the stability of knee and are effective in preventing knee injuries and reinforces rehabilitation.

• The Korean Journal of Physiology and Pharmacology
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• 제26권5호
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• pp.325-333
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• 2022

Heart failure (HF) has become one of the severe public health problems. The detailed role of mitochondrial function in HF was still unclear. Benzoylaconine (BAC) is a traditional Chinese medicine, but its role in HF still needs to be explored. In this study, oxygen-glucose deprivation and reperfusion (OGD/R) was executed to mimic the injury of H9C2 cells in HF. The viability of H9C2 cells was assessed via MTT assay. OGD/R treatment markedly decreased the viability of H9C2 cells, but BAC treatment evidently increased the viability of OGD/R-treated H9C2 cells. The apoptosis of H9C2 was enhanced by OGD/R treatment but suppressed by BAC treatment. The mitochondrial membrane potential was evaluated via JC-1 assay. BAC improved the mitochondrial function and suppressed oxidative stress in OGD/R-treated H9C2 cells. Moreover, Western blot analysis revealed that the protein expression of p-AMPK and PGC-1α were reduced in OGD/R-treated H9C2 cells, which was reversed by BAC. Rescue assays indicated that AMPK attenuation reversed the BAC-mediated protective effect on OGD/R-treated cardiomyocytes. Moreover, BAC alleviated myocardial injury in vivo. In a word, BAC modulated the mitochondrial function in OGD/R-induced cardiomyocyte injury by activation of the AMPK/PGC-1 axis. The findings might provide support for the application of BAC in the treatment of HF.

• Journal of the Korean Wood Science and Technology
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• 제52권2호
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• pp.118-133
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• 2024

The sapwood portion of fast-growing teak is mostly ignored due to its inferior quality. One of the possibilities for utilizing sapwood waste is to convert it into activated carbon that has good adsorption capabilities. The raw materials used in this research were sapwood of 14-year-old fast-growing teak sapwood (FTS) waste, which was taken from three trees from community forests in Wonosari, Gunungkidul, Yogyakarta Special Region. FTS waste was taken from the bottom of the tree up to a height of 1.3 m. The activation process is conducted with an activation temperature of 750℃, 850℃, and 950℃. The heating duration consists of three variations: 30 min, 60 min, and 90 min. The quality evaluation parameters of activated carbon include yield, moisture content, volatile matter content, ash content, fixed carbon content, adsorption capacity of benzene, adsorption capacity of methylene blue, and adsorption capacity of iodine. The results showed that the activated carbon produced had the following quality parameters: yield of 75.61%; moisture content of 1.27%; volatile matter content of 9.98%; ash content of 5.43%; fixed carbon content of 84.58%; benzene absorption capacity of 8.58%; methylene blue absorption capacity of 87.73 mg/g; and iodine adsorption capacity of 948.19 mg/g. It can be concluded that activated carbon from FTS waste has good iodine adsorption, which fulfilled the SNI 06-3730-1995 quality standard. Due to the iodine adsorption ability of FTS waste activated carbon, the conversion of FTS waste to activated carbon is categorized as a potential method to increase the value of this material.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제12권3호
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• pp.103-110
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• 2023

인터넷이 보급되면서 사람들 간의 소통을 위한 커뮤니티가 활성화됨과 함께 익명 커뮤니티가 나타났고 익명성을 이용한 공격적인 게시글, 댓글을 남기는 등 타인에게 피해를 주는 행위를 하는 이용자가 많아지고 있다. 과거에는 관리자가 직접 글과 댓글을 확인하며 삭제 및 차단했지만, 커뮤니티 이용자가 늘어나면서 관리자가 계속 감시할 수 없는 수준에 이르렀다. 초기에는 특정 단어가 포함되면 해당 글을 게시하거나 댓글을 달 수 없는 형태로 악의적인 글이 게시되는 것을 막는 단어 필터링 기법을 사용하였으나 유사한 단어를 사용하는 등 우회하는 형식으로 필터링을 피해 갔다. 이를 해결하는 방법으로 딥러닝을 이용하여 실시간으로 이용자들이 게시하는 글들을 감시하였으나 최근 커뮤니티에서는 해당 커뮤니티에서만 이해할 수 있는 단어를 사용하거나 일반적인 한글이 아닌 인간의 시야에서만 이해할 수 있는 문자를 사용하고 있다. 이들이 사용하는 문자의 종류나 형태가 다양하여 인공지능 모델에 모든 것을 학습시키기에 어려움이 있다. 이에 본 논문에서는 한글의 자음과 모음 띄어쓰기 이미지를 학습시킨 CNN 모델을 이용해서 문장의 각 문자를 이미지화해 인간의 시야에서만 이해할 수 있는 문자를 모델이 예측한 문자로 변환하는 전처리 기법을 제안한다. 실험 결과, 제안한 전처리 기법을 통해 LSTM, BiLSTM, CNN-BiLSTM 모델에서의 성능이 각각 3.2%, 3.3%, 4.88% 증가함을 확인했다.

• 디지털융복합연구
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• 제14권10호
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• pp.431-438
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• 2016

본 연구는 뉴미디어 플랫폼을 통해 글로벌 시장에서 소비되는 한류 콘텐츠 서비스에 초점을 맞추어, 서비스별 비즈니스 모델 분석을 통해 성공/실패 요인을 살펴본 것이다. 단순한 콘텐츠 공급자가 아니라 서비스 제공자로 시장을 확대해 나가는 관점에서, 효과적인 뉴미디어 콘텐츠 플랫폼 모델을 제시하는 것이 목적이다. 대표적인 한류 OTT서비스인 비키, 드라마피버, 마두닷컴을 대상으로 서비스 경영전략과 성공/실패 요인을 살펴보았다. 성공적인 비즈니스 모델의 네 가지 요소-고객 가치, 이익 공식, 핵심 자원, 핵심 프로세스-를 기반으로, 관련 자료와 문헌, 설립자 및 CEO 인터뷰 등을 통해 사례연구를 했다. 글로벌 OTT 플랫폼의 성공 요인은 타깃 고객의 커버리지, 수익 모델, 커뮤니티의 활성화 등 세 가지로 정리된다. 명확한 타깃 고객을 정하고, 넓은 고객 커버리지를 갖는 것이 서비스의 가치를 결정하는데 중요하다. 또 플랫폼의 수익모델은 광고를 기반으로 유료 서비스를 제공해야 하며, 한류 콘텐츠 팬덤을 형성하고 지속적인 콘텐츠 소비를 이끌기 위해서는 커뮤니티의 형성과 관리가 필수적이다.

• 지역사회간호학회지
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• 제7권2호
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• pp.400-409
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• 1996

To investigate industrial fatigue and low back pain, the questionaire survey for subjective symptoms of fatigue and low back pain was carried out among 591 male workers aged 20-55 employed in an automobile industry in Korea. Workers participated to this study were divided into low back pain group(LBP) and control group, according to the self-reports by written questionaires. The subjective sysptoms of fatigue comprised three groups of 10 items each, representing dullness and sleepiness(level of cerebral activation), difficulty in concentration(level of motivation) and bodily projection of fatigue. The resultant data were processed for $\chi^2-test$, t-test and a pearson's correlation coefficient to confirm the relationships. The results were as follows: 1. 30 items of fatigue subjective symptoms exeptone item, 'lack in perseverance', were directly associated with low back pain. 2. The percentage of fatigue complaint were sig nificantly higher in LBP group. 3. Of the 30 items of fatigue subjective symptoms, the highest percentage was accounted for 'eye strain'(27.9%), followed by 'whole body feels tired' and 'legs feel heavy'(22.9%), 'feel like lying'(21.4%), 'feel a pain in the low back'(18.7%), 'feel drowsy'(16.4%) and 'feel stiffness in the neck or the shoulders'(16.2%) in the order of sequence. 4. The average weighted score for the first group of fatigue items(dullness and sleepiness) was the largest among three groups and was followed by the second group(difficulty in concentration) and the third group(bodily projection of fatigue) in the order of sequence, suggesting the heavier shift work stress of the workers. 5. In the groups of the aged 30-40, work duration of 5-7yrs, heavy work amount and irregular work speed, significant high fatigue complaints were revealed in terms of eye strain, whole body feels tired, legs feel heavy, feel like lying, feel a pain in the low back and feel stiffness in the neck or the shoulders. 6. A significant negative correlations were shown between age, work duration and eleven subjective symptoms while positive reciprocal correlations were shown between eleven items with one another.

• 한국콘텐츠학회논문지
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• 제11권12호
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• pp.950-957
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• 2011

학문 분야의 융 복합화가 진행되고 웹 2.0 등장에 따른 온라인 협업 환경이 조성되면서 연구자들의 온라인 지식 교류 활동이 증가하고 있다. 국내에도 다양한 과학기술자 커뮤니티가 존재하나 단순 자료 교환 수준의 교류는 활발하나 고급 지식의 교류는 미약한 편이다. 글로벌 무한 경쟁 시대에 지식을 습득하고 자산화 하는데 소요되는 시간은 연구생산성에 큰 영향을 미치므로 과학기술자들의 온라인 지식 교류 활성화가 매우 중요한 상황이다. 본 연구에서는 과학기술자 지식 교류 서비스의 발전 방안을 제시하고자 참여 활성화, 지식 품질 제고, 교류 신속성을 주안점으로 하여 국내외의 다양한 지식 교류 서비스를 비교 분석하였으며 특히 국내의 대표적 사례인 KOSEN What is? 서비스 운영 사례를 집중 분석하였다. 연구 결과 교류되는 지식의 품질은 필수 조건이며 보다 활성화된 지식 교류를 위해서는 전문가 참여 유도, 전문가 매칭 시스템 개발, 지식 교류의 신속성 강화, 사용성 편의성 증진, 재미 요소 도입 등 다양한 운영 활동이 필요한 것으로 확인되었다.

• Journal of Microbiology and Biotechnology
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• 제22권9호
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• pp.1264-1270
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• 2012

The ecotoxicological effects of nanomaterials on animal, plant, and soil microorganisms have been widely investigated; however, the nanotoxic effects of plant-soil interactive systems are still largely unknown. In the present study, the effects of ZnO nanoparticles (NPs) on the soil-plant interactive system were estimated. The growth of plant seedlings in the presence of different concentrations of ZnO NPs within microcosm soil (M) and natural soil (NS) was compared. Changes in dehydrogenase activity (DHA) and soil bacterial community diversity were estimated based on the microcosm with plants (M+P) and microcosm without plants (M-P) in different concentrations of ZnO NPs treatment. The shoot growth of M+P and NS+P was significantly inhibited by 24% and 31.5% relative to the control at a ZnO NPs concentration of 1,000 mg/kg. The DHA levels decreased following increased ZnO NPs concentration. Specifically, these levels were significantly reduced from 100 mg/kg in M-P and only 1,000 mg/kg in M+P. Different clustering groups of M+P and M-P were observed in the principal component analysis (PCA). Therefore, the M-P's soil bacterial population may have more toxic effects at a high dose of ZnO NPs than M+P's. The plant and activation of soil bacteria in the M+P may have a less toxic interactive effect on each of the soil bacterial populations and plant growth by the ZnO NPs attachment or absorption of plant roots surface. The soil-plant interactive system might help decrease the toxic effects of ZnO NPs on the rhizobacteria population.

• 디지털콘텐츠학회 논문지
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• 제18권1호
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• pp.9-16
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• 2017

최근 경제의 장기적 불황으로 저렴하게 좋은 상품을 구매하려는 소비자의 욕구가 급증하고 있다. 저렴하게 좋은 상품을 구매하는 방법으로는 중고거래가 각광을 받고 있으며, 중고거래가 활성화됨에 따라 소비자가 느끼는 중고거래에 대한 심리적 거리감도 줄어들고 있다. 특히 대학교의 전공서적 같은 고가의 도서의 경우 각 대학마다 중고도서 전용의 커뮤니티가 생길 정도로 활발한 거래가 이루어지고 있다. 하지만, 대학 중고도서 거래 전용 사이트의 경우 실시간 거래 현황을 한눈에 알아보기 힘들고, 단방향적인 판매자의 가격 설정으로 인해 합리적 도서 구매가 불가능하다. 본 논문에서는 누구나 손쉽게 중고도서 거래를 할 수 있는 경매 방식 기반 중고도서 거래 웹 서비스를 설계 및 구현하였다. 본 서비스는 웹 기반으로 설계되었으며 편리하고 효율적인 도서 등록 및 검색 기능을 통해 사용자에게 편리함을 제공한다.

• 한국지역사회생활과학회지
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• 제27권spc호
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• pp.665-679
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• 2016

This study examined the main factors for activating rural tourism of Jeollabuk-do using big data analysis. The tourism big data was gathered from public open data sources and social network services (SNS), and the analysis tools, 'Opinion Mining', 'Text Mining', and 'Social Network Analysis(SNA)' were used. The opinion mining and text mining analysis identified the key local contents of the 14 areas of Jeollabuk-do and the evaluations of customers on rural tourism. Social network analysis detected the relationships between their contents and determined the importance of the contents. The results of this research showed that each location in Jeollabuk-do had their specific contents attracting visitors and the number of contents affected the scale of tourists. In addition, the number of visitors might be large when their tourism contents were strongly correlated with the other contents. Hence, strong connections among their contents are a point to activate rural tourism. Social network analysis divided the contents into several clusters and derived the eigenvector centralities of the content nodes implying the importance of them in the network. Tourism was active when the nodes at high value of the eigenvector centrality were distributed evenly in every cluster; however the results were contrary when the nodes were located in a few clusters. This study suggests an action plan to extend rural tourism that develop valuable contents and connect the content clusters properly.