• 벤처창업연구
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• 제17권6호
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• pp.89-104
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• 2022

산업 현장에서 축적된 기술과 전문성을 갖고 있는 시니어의 창업은 사회적인 측면에서 매우 중요하다. 본 연구는 시니어를 대상으로 4차 산업혁명기에 코로나19로 인해 변화된 일자리 사회구조와 최근 급격하게 진행되고 있는 고금리 및 글로벌 공급망 문제 등으로 불안 요인과 불확실성이 증폭된 경제 상황 속에서 시니어의 주요한 창업역량 변수들이 창업의도에 어떤 영향을 미치는가 실증적으로 검증하고자 하였다. 또한 예비창업자 개인 심리적 특성인 마인드셋의 관점에서 성장 마인드셋과 고정 마인드셋이 시니어 창업의도에 유의미한 영향을 미치는지 실증적으로 검증하고자 하였다. 창업자의 심리적 특성을 마인드셋의 관점에서 접근하여 창업분야에 적용하려고 시도하고 실무적 시사점을 얻고자 하였다. 본 연구는 마인드셋의 구성 요인인 성장 마인드셋, 고정 마인드셋과 창업역량의 기술적 역량, 네트워크 역량, 자금조달 역량이 시니어 창업의도에 미치는 영향을 실증적으로 분석하고 창업효능감의 매개효과를 검증하였다. 실증분석 결과는 성장 마인드셋과 기술적 역량은 창업의도에 정(+)의 효과를 미치는 것으로 검증되었다. 또한 성장 마인드셋과 기술적 역량이 창업의도에 미치는 영향에서 창업효능감의 매개효과가 유의한 것으로 검증되었고 시니어 창업에 있어 성장 마인드셋과 기술적 역량이 중요한 변수임을 검증하였다. 연구 결과 다음의 정책적 시사점을 준다. 시니어 창업을 활성화하기 위해서는 첫째, 창업자 교육 시 효과의 극대화를 위해 창업자의 심리적 특성인 성장 마인드셋 특성에 부합한 맞춤형 창업교육 등의 프로그램이 필요하다. 둘째, 기술 역량과 전문성을 갖춘 시니어 창업에 대해서는 저금리의 정책금융 확대 등 정부지원 확대로 기술창업의 저변확대가 요구된다. 셋째 시니어에게 축적되어있는 전문성과 기술력을 퇴직 후에도 창업에 연계될 수 있도록 퇴직 전부터 창업 프로그램의 제공 등 창업을 준비할 수 있는 제도적 시스템의 지원이 필요하다.

• Journal of Microbiology and Biotechnology
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• 제31권3호
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• pp.439-446
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• 2021

Quercus infectoria (nutgall) has been reported to possess antimicrobial activities against a wide range of pathogens. Nevertheless, the biofilm removal effect of nutgall extract has not been widely investigated. In this study, we therefore evaluated the effect of nutgall extract in combination with cetrimonium bromide (CTAB) against preformed biofilm of Salmonella Typhimurium on polypropylene (PP) and stainless steel (SS) coupons in comparison with other sanitizers. The minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of nutgall extract and surfactants (CTAB and sodium dodecyl sulfate; SDS) were assessed. CTAB showed a more efficient antimicrobial activity than SDS and was selected to use in combination with nutgall extract for removing biofilm. To determine the biofilm removal efficacy, the PP and SS coupons were individually submerged in 2x MBC of nutgall extract (256 mg/ml) + 2x MBC of CTAB (2.5 mg/ml), nutgall extract alone (256 mg/ml), CTAB alone (2.5 mg/ml), distilled water, and 100 ppm sodium hypochlorite for 5, 15, and 30 min. The remaining sessile cells in biofilm were determined. Overall, the greatest biofilm removal efficacy was observed with nutgall extract + CTAB; the biofilm removal efficacy of sanitizers tended to increase with the exposure time. The SEM analysis demonstrated that S. Typhimurium biofilm on PP and SS coupons after exposure to nutgall extract + CTAB for 30 min displayed morphological alterations with wrinkles. This study suggests nutgall extract + CTAB may be an alternative to commonly used sanitizers to remove biofilm from food contact surfaces in the food industry and household.

• 대한핵의학회지
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• 제39권2호
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• pp.69-74
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• 2005

Ever since it was first introduced as a method of scintigraphically measuring regional myocardial perfusion, myocardial perfusion study has been widely used in patients diagnosed or suspected with coronary artery diseases, and continuously improved upon. In addition to the technological enhancement of nuclear medicine equipments, the innovation of radiopharmaceuticals used in the cardiac exams were important contributors to such improvement. Besides the cardiac perfusion studies, new radiopharmaceuticals that visualize fat metabolism or receptors of the sympathetic nervous system have successfully been applied to clinical practice. More information can be collected before diagnosing coronary vascular disease, evaluating the patient's condition, or assessing therapeutic effects. In this review article, the clinical efficacy and characteristics of radiopharmaceutical products tailored for cardiac SPECT that are commonly used in Korea currently, plus the ones not being used yet but have proven value are briefly described.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1995년도 춘계학술발표회 초록집
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• pp.158-162
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• 1995

Synergistic effects of mixed solvents, especially with mixtures of CS$_2$ with electron donor solvents, in inducing desired structural changes in coals were studied by solvent swelling techniques in addition to differential scanning calorimetric analyses. Mixed solvents exhibit significant synergistic efficacy in swelling the coal structure of medium bituminous rank. This synergy effect appears to be physical origin that is closely related to matching solubility parameters. Since the swollen coal structure can be obtained by mixed solvents with CS$_2$ at room temperature instead of high temperature, many possible technological pathways for economical utilization of coal might be sought.

• Structural Engineering and Mechanics
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• 제37권6호
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• pp.633-648
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• 2011

This paper investigates the aspect-ratio locking of the isoparametric 8-node quadrilateral (QUAD8) element. An important finding is that, if finite element solution is carried out with in exact arithmetic (i.e., with no truncation and round off errors), the locking tendency of the element is completely avoided even for aspect-ratios as high as 100000. The current finite element codes mostly use floating point arithmetic. Thus, they can only avoid this locking for aspect-ratios up to 100 or 1000. A novel method is proposed in the paper to avoid aspect-ratio locking in floating point computations. In this method, the offending terms of the strain-displacement matrix (i.e., $\mathbf{B}$-matrix) are multiplied by suitable scaling factors to avoid ill-conditioning of stiffness matrix. Numerical examples are presented to demonstrate the efficacy of the method. The examples reveal that aspect-ratio locking is avoided even for aspect-ratios as high as 100000.

• Asian Journal for Public Opinion Research
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• 제7권3호
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• pp.143-168
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• 2019

With much attention being paid to the rapid growth of wrist-worn smart devices, this study aimed to examine the micro-processes that determine an individual's adoption of smart bands and smartwatches. Primarily relying on the theoretical background of the extended technology acceptance model (TAM II), this study explored relationships between three groups of predictors-social, personal, and device-oriented-and the three main components of the original TAM: perceived usefulness (PU), perceived ease of use (PEOU), and behavioral intention (BI). Results from the path analysis indicated multiple factors played significant roles in increasing the PU, PEOU, and BI of wristworn smart devices: subjective norms, social image, self-efficacy, perceived service diversity, and perceived reasonable cost. The main findings from this research contribute to significantly improving the understanding of the main factors leading people to adopt wrist-worn smart devices.

• Asia Marketing Journal
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• 제19권3호
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• pp.75-98
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• 2017

Our study is trying to investigate the perceived training effectiveness by applying the theory of planned behavior (TPB) and Technological Acceptance Model (TAM) and intend to examine the effects of individual differences on perceived training effectiveness and performance of individuals. The main purpose is to evaluate the perceived training effectiveness, and role of individual differences in terms of learning. The results of this study supported all the hypothesis that participants with higher level of creative self-efficacy, intrinsic motivation, creativity and emotional intelligence (EI) will have greater inclinations to learn. Results showed that perceive training effectiveness is positively related to training transfer and training transfer increase the performance of individuals. Study results significantly agree with the theory of planned behavior (TPB) which was applied to measure the perceived training effectiveness and suggest trainee's perception of usefulness, ease and benefits enhance learning dimensions of participants that make any program effective. The study has highlighted a number of issues that influence the perceived training effectiveness.

• 정보보호학회논문지
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• 제34권3호
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• pp.463-478
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• 2024

발전제어시스템의 보안 취약점 개선을 위한 선행 연구의 한계점을 분석하고 그 대안으로 사이버 보안 정보공유모델을 제안하였다. 발전제어시스템의 운영 특성을 파악하고 사이버 보안 정보공유 개념과 정책, 실제 구현사례들을 분석하여 발전제어시스템에 효과적으로 적용할 수 있는 정책과 기술방안을 제시하고 모델평가를 시행하였다.

• Journal of information and communication convergence engineering
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• 제22권2호
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• pp.159-164
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• 2024

This study aimed to develop an advanced anomaly-detection system tailored for solar power distribution panels using thermal imaging cameras to ensure operational stability. It addresses the imperative shift toward digitalized safety management in electrical facilities, transcending the limitations of conventional empirical methodologies. Our proposed system leverages a faster R-CNN-based artificial intelligence model optimized through meticulous hyperparameter tuning to efficiently detect anomalies in distribution panels. Through comprehensive experimentation, we validated the efficacy of the system in accurately identifying anomalies, thereby propelling safety protocols forward during the fourth industrial revolution. This study signifies a significant stride toward fortifying the integrity and resilience of solar power distribution systems, which is pivotal for adapting to emerging technological paradigms and evolving safety standards in the energy sector. These findings offer valuable insights for enhancing the reliability and efficiency of safety management practices and fostering a safer and more sustainable energy landscape.

• Asian Pacific Journal of Cancer Prevention
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• 제17권1호
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• pp.117-123
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• 2016

Taxol (paclitaxel) is a powerful anti-cancer drug widely used against several types of malignant tumors. Because Taxol may exert several side effects, a variety of formulations have been developed. One of these features liposomes, regarded as one of the most promising drug carriers, biocompatible and best able to reduce drug toxicity without changing efficacy against tumor cells. Eruca sativa seed extract (SE) is considered a promising natural product from cruciferous vegetables against breast cancer, increasing chemotherapeutic and eliminating harmful side effects. The effects of Taxol-encapsulated liposomes (T) alone and in combination between Eruca sativa seed extract on nuclear factor kappa B (NF-${\kappa}B$), cyclooxygenase-2 (COX-2) and B-cell lymphoma-2 (Bcl-2) gene expression levels were investigated in rat mammary gland carcinogenesis induced by 7,12 dimethylbenz(${\alpha}$) anthracene (DMBA) using qRT-PCR. The results showed that DMBA increased NF-${\kappa}B$, COX-2 and Bcl-2 gene expression levels and lipid peroxidation (LP), while decreasing glutathione-S-transferase (GST) and superoxide dismutase (SOD) activities and total antioxidant concentration (TAC) compared to the control group. T and T-SE treatment reduced NF-${\kappa}B$, COX-2 and Bcl-2 gene expression levels and LP. Hence, T and T-SE treatment appeared to reduce inflammation and cell proliferation, while increasing apoptosis, GST and SOD activities and TAC.