With the increasing demand for energy conservation and emissions reduction in the shipping industry, suctionbased turbine sails have emerged as a novel wind energy utilization technology and have become a research hotspot. This study focuses on the aerodynamic performance of suction-based turbine sails with the aim of investigating the effects of suction intensity and suction port position on their aerodynamic characteristics. By employing Computational Fluid Dynamics (CFD) numerical simulations using the Re-Normalization Group (RNG) k–ε turbulence model and the SIMPLE algorithm, this study provides a detailed analysis of lift and drag coefficients, pressure distribution, and vorticity distribution under various combinations of suction intensity (γ) and suction port position (α). The results show that variations in suction intensity significantly affect the lift and drag characteristics of the turbine sail, while changes in the suction port position directly influence the attachment and separation behavior of airflow on the sail surface. Furthermore, a synergistic effect is observed between γ and α—their interaction not only alters the flow distribution but also plays a critical role in determining the overall performance of the turbine sail.By comprehensively considering the influence of these two factors, the study draws key conclusions for optimizing the design of suction-based turbine sail, providing valuable theoretical insights and technical guidance for their practical application in wind-assisted marine propulsion.

대한민국 정부들은 복지국가를 시대적 과제로 천명하고 있음에도, 낮은 복지 지출과 높은 사회적 불안이 라는 현실에 직면해 있다. 본 논문은 이러한 상황을 타개하기 위한 전략으로 복지국가 ‘체제’의 기획을 제안 하며, 그에 필요한 관점과 방향성을 얻기 위해 복지국가이론의 계보를 탐색한다. 먼저, ‘전후 복지국가’의 팽창을 설명하는 이론들을 고찰하고, 복지체제론을 통해 그 성숙과 위기 대응 양상도 살펴본다. 다음으로, 새로운 사회경제적 환경에 조응하여 진행되는 복지국가의 재구조화, 즉 ‘탈(脫) 전후 복지국가’의 등장을 설명하는 현대 이론들을 종합적으로 검토한다. 이렇듯 복지국가이론의 계보를 살피는 것은 현행 제도의 구 조와 작동원리를 이해하고 미래 기획을 위한 아이디어를 얻는 과정이자, 대한민국이 사회권적 기본권이 적 극 구현되는 나라로 나아가는 데에 필요한 지적 토대를 쌓는 일이라고 본 논문은 주장한다.

In the context of higher education (HE) internationalization, English as a Lingua Franca (ELF) plays a crucial role in academic and interactive communication, often intersecting with local languages. This enables greater flexibility in language use and code-switching (CS) between English and the local language. While previous research on English as a Medium of Instruction (EMI) has predominantly examined the perspectives of local stakeholders, the views of international students have been largely underexplored. To bridge this gap, this study investigates the perceptions of both local and international students regarding CS practices within EMI courses across specific classroom situations. The findings reveal that both groups support the conditional use of the local language to promote comprehension while ensuring inclusivity. Local students demonstrate a broader acceptance of CS compared to their international counterparts, particularly in relation to academic outcomes such as understanding instruction and assessment. In contrast, international students show greater receptiveness to CS during interactive classroom discussions, which reflects their attitudes toward engaging with local peers. These insights contribute to the development of more nuanced EMI policies and deepen our understanding of language dynamics in HE contexts where English is not the native language.

This study explores a church leader’s perceptions of language policy goals and cultural practices within a Korean-American church, as well as the changes prompted by the COVID-19 pandemic. Drawing on theories of ethnic churches, language planning and policy, and communicative frameworks of organizational identity, the study employs critical discourse analysis and thematic analysis. Data were collected through multiple qualitative methods, including participant observation of English and Korean worship services, two in-depth interviews, audio recordings, and artifact documentation. The findings highlight the dual role of first language and cultural practices in affirming both ethnic identity and Christian faith among Korean congregants. Furthermore, this research illuminates the integrative role of the church—both institutionally and socially—during a global crisis. The church leader’s motto, “Stay well and stay connected,” was expressed through linguistic and cultural adaptations that promoted a sense of belonging and positive identity amidst uncertainty.

This study examined the effects of pre-soaking solvents and repeated steaming-drying (SD) cycles on the antioxidant activity and active compound content of Rehmanniae Radix Preparata(RRP), the processed root of Rehmannia glutinosa Libosch. SD treatments were conducted for 1 to 9 cycles using four different pre-soaking solvents: Takju (a traditional rice wine), Spirits, Honey, and Sugar solution. The results showed no significant differences in DPPH and ABTS radical scavenging activities or in total polyphenol and flavonoid contents among the pre-soaking treatments, although samples pre-soaked in honey and Takju exhibited slightly higher levels. Polyphenol and flavonoid contents increased progressively with the number of SD cycles, reaching levels 2–3 times higher after nine cycles. Catalpol content remained relatively constant regardless of treatment, whereas aucubin content increased in all groups, with the highest accumulation observed in the Takju treatment. Similarly, 5-hydroxymethylfurfural (5-HMF) content increased with the number of SD cycles, with the highest levels found in the honey group, followed by Takju, Sugar, and Spirits. In conclusion, while the type of pre-soaking solvent had minimal influence on antioxidant activities and catalpol content, both aucubin and 5-HMF contents increased with additional SD cycles, with Takju proving particularly effective in enhancing their accumulation.

In the context of increasingly uncertain maritime logistics environments, container Demurrage and Detention (D&D) charges pose a significant challenge to both carriers and shippers. Traditional policies typically impose separate cost structures for container pickup (demurrage) and container return (detention), yet such separate impositions often fail to capture the interconnected nature of operational delays and the pervasive uncertainty present in hinterland container flows. This study addresses the problem of D&D decision-making under uncertainty by proposing a merged free time policy that integrates both D&D charges into a unified framework. By merging the free time allocated for both pickup and return processes, the proposed policy aims to enhance operational flexibility, reduce overall logistics costs, and provide a more predictable cost structure for carriers while improving service quality for shippers. To achieve these objectives, we develop a mathematical optimization model that incorporates stochastic pickup and return scenarios, thereby reflecting the uncertainties in container availability and transportation delays. The model embeds a strategic decision-making process between carriers and shippers through a hierarchical framework to jointly optimize free time allocations and penalty structures. Numerical experiments based on simulated data demonstrate that the merged free time policy outperforms traditional separate policies by improving container turnover efficiency and mitigating the negative impact of uncertainty on operational performance. Our findings offer valuable insights into cost management and risk reduction in maritime logistics and contribute to the literature by providing a comprehensive strategy for D&D management that supports more collaborative hinterland container operations and enhances overall supply chain resilience.

The current standard treatment regimen for patients with cervical cancer consists of a combination of radiotherapy and chemotherapy. However, the serious side effects often encountered with chemotherapy drugs greatly limits the effective doses that can be delivered, and hence the treatment of cervical cancer still faces strong challenges. In this study, carbon nanodots, nanodrugs with anti-cervical cancer activity and with negligible toxicity, were prepared from the precursor herbal extract ginsenoside Rg1. The surface of the Rg1 carbon nanodots is rich in hydrophilic functional groups, resulting in good dispersion in aqueous media and high biocompatibility. In Vitro experiments show that the Rg1 carbon nanodots have significant cytostatic and pro-apoptotic effects on HeLa cells, and could inhibit their migration and invasion. Experiments in tumor-bearing nude mice show that the Rg1 carbon nanodots could significantly inhibit tumor growth. Through qPCR validation, the Rg1 carbon nanodots were shown to enhance HeLa cell apoptosis, by regulating the expression levels of Cyto c, Caspase-9, Caspase-3, Bax, and Bcl-2, induce G2/M phase arrest by regulating CDK 1 and Cyclin B1 expression, and inhibit tumor cell migration by modulating CDH1 and β-catenin. Since the precursor Rg1 is a natural herbal extract, negligible toxic side effects were observed in nude mice. The work demonstrates that Rg1 carbon nanodots can be expected to become a potential nanomedicine against human cervical cancer with negligible toxic side effects and excellent therapeutic effects.

This study investigates the acute toxicity of sublethal tributyltin (TBT) exposure in the marine polychaetes Perinereis aibuhitensis by measuring changes in mortality, burrowing activity, acetylcholinesterase (AChE) function, and antioxidant defense mechanisms. The 96h-LC50 of TBT was established at 23.7 μg L⁻¹. Following exposure to 1 μg L⁻¹ of TBT led to a dose-dependent reduction in burrowing behavior and AChE activity in polychaetes. Elevated levels of malondialdehyde (MDA) and pronounced reduction of glutathione (GSH) contents explained significant oxidative stress. The major antioxidant enzymes, including GSH peroxidase, GSH reductase, catalase, and superoxide dismutase, were also significantly suppressed following TBT exposure. These findings indicate that TBT-induced acute toxicity compromises physiological functions and undermines antioxidant defense system in polychates.

Growth is a fundamental and vital characteristic of abalone, regulated by both cell number and size, and modulated by growth-related genes. The mollusk-like growth factor (MLGF) is a secreted protein that plays a key role in the growth and development of Pacific abalone. In this study, the growth-specific expression of Hdh-MLGF were analyzed under different conditions commonly encountered by Pacific abalone in aquaculture systems. The expression of Hdh-MLGF varied significantly with growth patterns, showed higher expression in rapid-growing individuals and lower expression in slow-growing abalone. Under starvation conditions, Hdh-MLGF expression was downregulated as the duration of starvation progressed. Under thermal stress, Hdh-MLGF expression increased during the first 12 hours at 25 °C stress. However, at 30 °C, the highest expression was recorded after 6 hours of thermal stress. These results provide valuable insights for future research on this growth factor in abalone and its aquaculture management.

진동자극에 따른 틸라피아(Oreochromis niloticus)의 스트레스 반응에 대한 기초자료를 얻고자, 혈액[(cortisol, glucose, lactic acid, aspartate aminotransferase (AST), alanine aminotransferase (ALT), total protein (TP), red blood cell (RBC), hemoglobin (Hb), hematocrit (Ht), 조직(liver, kidney, intestine) 및 성장을 분석하였다. 실험어류는 틸라피아(평균 전장 11.7±0.4 cm, 평균 체중 23.4±3.7 g)를 사용하였으며, 28일 동안 실험을 진행하였다. 실험구는 대조구, T1(10:00, 19:00), T2(10:00, 13:00, 16:00 19:00)로 각각 1시간씩 진동을 주었다. 혈액, 혈장, 간, 신장 및 장 샘플은 진동 노출 후 0, 7, 14, 21 및 28일에 채취하여 분석하였다. 혈장 코티졸 농도는 21일째 대조구와 T1에서 유의하게 높았으나, 28일째 감소하였다. 반면에, T2에서는 28일째 다른 실험군보다 유의하게 높아졌다. 젖산은 14일째 T2에서 다른 실험구에 비해 유의하게 높아졌다. 혈장 AST 및 ALT는 T2에서 실험기간동안 유의적으로 높아졌다. T1과 T2는 실험 기간 동안 혈장 TP가 증가하였다. T1은 28일째 다른 실험구에 비해 RBC, Hb 및 Ht가 유의하게 높아졌다. 조직관찰 결과, T2에서 간조직은 혈액 정맥동의 울혈 및 확장, 비대, 침윤, 공포화, 신장에서는 흑색 대식세포 증가, 간질 부종 및 장에서 괴사가 관찰되었다. 성장은 진동 자극 횟수가 증가함에 따라 최종 무게(final body weight), 체중성장률(growth rate for body weight, GRW), 일일성장률 (specific growth rate, SGR) 및 사료효율(feed efficiency, FE)이 대조군에 비해 감소하였으나 유의적인 차이는 보이지 않았다.

본 논문은 초국가적 종교 인식론적 공동체의 관점에서 탈동성애 운동 의 세계정치적 양상을 분석한다. 일반적으로 탈동성애 운동은 동성애 정 체성을 벗어났다고 주장하는 개인들에 의해 주도되는 지역적·문화적 현 상으로 여겨지지만, 실제로는 서구권의 보수적 복음주의 세력이 주도하 는 조직화된 국제 네트워크임을 확인할 수 있다. 이러한 네트워크는 특 정 분야의 정책 형성에 영향을 미치는 지식과 권위를 공유하는 전문가 집단, 즉 인식론적 공동체로서 기능한다. 특히 탈동성애 운동의 종교 보 수 활동가들은 자신을 인간의 성(性)에 관한 전문가로 규정하고, 과학적 외형을 갖춘 증거, 헌법적·권리 기반의 논리, 개인의 간증 등 다양한 전 략을 활용하여 동성애가 변화 가능하며 바람직하지 않은 것이라고 주장 한다. 본 연구는 한국을 주요 사례로 삼아, 한국의 보수적 복음주의 엘리 트들이 서구(특히 미국)의 복음주의자들로부터 탈동성애 담론과 전략을 체계적으로 수입하고 현지화한 방식을 경험적으로 분석한다. 구체적으로, 한국의 활동가들이 초국적으로 유통되는 진정성, 피해자성, 인권과 같은 자유민주주의적 레토릭을 전략적으로 차용하여, 자신들의 LGBTQ+ 인권 반대 활동을 종교의 자유 및 주체적인 삶의 경험(lived experiences)의 정당한 표현으로 재구성하고 있음을 보여준다.

본 연구는 우즈베키스탄 자동차 산업 발전에 있어 리버스 엔지니어링 의 역할을 탐구하며, 특히 노나카와 타케우치의 지식 창출 모델(SECI Model)과의 통합에 중점을 두고 있다. 우즈베키스탄이 경쟁력 있는 국내 산업을 구축하고자 노력함에 따라, 리버스 엔지니어링은 해외 기술의 습 득, 적용, 그리고 국산화를 가능하게 했다. 본 연구는 정성적 사례 연구 접근법을 활용하여 기업 보고서, 정책 문서, 학술 문헌을 바탕으로 1996 년부터 2024년까지의 발전 상황을 분석한다. 연구 결과에 따르면 리버스 엔지니어링은 지식 이전과 혁신을 지원해 왔지만, 제한된 R&D 역량, 수 입 부품 의존도, 그리고 취약한 지식재산권 보호 등의 과제가 여전히 남 아 있다. 이러한 장벽을 극복하기 위해 본 연구는 전략적 정책, 국내 혁 신에 대한 투자 확대, 그리고 AI 기반 설계 프로세스 도입을 권고한다.

The current US tariff policy has become a focal point of the global trade order, signaling a restructuring of the international economic system established after World War II. The global trade regime is shifting from multilateral cooperation to a landscape increasingly defined by economic and geopolitical competition. The US domestic law is increasingly replacing multilateral mechanisms such as the WTO as the primary legal point at issue and center of gravity influencing and shaping the global trade order. In this transitional phase of order reconstruction, East Asian enterprises should allocate resources to closely monitor geopolitical developments, the US domestic politics, legal frameworks, and ideological trends. They should also establish mechanisms for geopolitical risk management and prioritize risk management over business expansion as a core strategic principle. However, this is not entirely negative; the new research, understanding, and strategic adjustments undertaken by enterprises may lay a deeper foundation for the next wave of globalization.

The US is in conflict with China over various trade issues. Although both countries agreed to temporarily suspend tariffs for the next 90 days, this trend is expected to continue after then. New related to tariffs has been a daily occurrence in the first 100 days of the Trump presidency, and yet a gap remains between the US and China that is difficult to bridge. This seems to stem from the fact that President Trump wants to “Make America Great Again” with a vengeance. In addition to implementing a new tariff system, the US seems to be moving towards supporting “strong patents” to safeguard intellectual property rights. These policies will significantly impact both the US and other nations worldwide. This article explores the external developments in the aftermath of the US presidential election and reviews current issues related to intellectual property in the US, focusing on tariff imposition and the prevailing emphasis on strong patent rights.

본 연구는 기업공개(IPO) 과정에서 최고경영자(CEO)의 해외 경험이 IPO의 성공에 미치는 영 향을 탐구하고, CEO가 경험한 국가와 주관사 국적 간 문화적 거리가 이 관계에 미치는 조절효과 를 분석한다. 또한 IPO 기업과 외부 투자자 간의 정보 비대칭성 정도가 CEO 해외 경험의 신호 효 과에 미치는 영향을 살펴본다. 2014년부터 2019년 사이 코스피와 코스닥 시장에 상장한 368개 기업을 대상으로 실증 분석을 진행한 결과, CEO의 해외 경험은 IPO 성공에 긍정적 영향을 미쳤다. 하지만 이러한 긍정적 영향은 CEO가 경험한 국가와 주관사의 국적 간 문화적 거리가 클수록 약화 되었다. 반면 IPO 기업과 외부 투자자 간 정보 비대칭성이 높을수록 CEO의 해외 경험이 IPO 성 공에 미치는 긍정적 효과는 더욱 강화되었다. 본 연구는 도구변수를 사용하여 내생성 문제를 통제 하였으며, 도구변수 사용 시에도 주요 가설은 대체로 지지되었다. 본 연구는 CEO의 해외 경험이 IPO 과정에서 중요한 신호(signal)로 작용할 수 있음을 제시하며, 특히 문화적 거리와 정보 비대 칭성이라는 맥락적 요인이 CEO 특성의 신호 효과를 조절할 수 있음을 밝힘으로써, 기업공개 및 신호 이론 연구에 기여한다. 실무적으로는 IPO를 준비하는 기업들이 해외 경험이 있는 CEO를 선 임하면 도움이 될 수 있음을 시사하고, 주관사를 선택할 때는 문화적으로 유사한 국가의 주관사를 전략적으로 고려할 필요가 있음을 시사한다.

Lithium- and manganese-rich layered oxide (LMRO) is considered a promising cathode material for lithium-ion batteries owing to its high capacity and energy density. However, operation at a high voltage of 4.8 V leads to several issues including low Coulombic efficiency, poor cycle life, slow kinetics, and voltage decay due to spinel phase transition, hindering commercialization. Herein, we synthesized a cobalt-free LMRO cathode and studied the effect of Nb2O5 and Sb2O3 coating layers on electrochemical performance. The Nb2O5 coating facilitated the formation of a LiNbO3 layer, which enhanced the initial electrochemical performance, including Coulombic efficiency and energy density. Meanwhile, Sb2O3 not only coated the surface but also doped into the bulk structure, thereby increasing capacity and improving rate capability. Comparative analysis using materials with different structural solubility revealed how oxide coatings influenced lithium-ion transport and electrochemical behavior. This study highlights the importance of interfacial engineering for optimizing LMRO cathodes for high-performance lithium-ion batteries.

본 연구는 국제경영전략 관점에서 해외자회사가 이전한 지식은 기업 경쟁력 강화에 언제나 긍정 적일 것이라는 가정을 비판하기 위해, 해외자회사의 역지식이전 수준과 기업성과 간 관계를 분석하 였다. 글로벌 기업 직원 256명을 대상으로 설문조사한 결과, 해외자회사가 본사로 이전한 지식 수 준이 높을수록 높은 기업성과를 보이는 것으로 나타났다. 그러나 이러한 효과는 해외자회사의 역량 및 해외자회사와 본사 간 비전공유 수준에 따라 차이를 보이는 것으로 나타났으며, 해외자회사의 역량이 낮거나, 비전공유 수준이 낮은 조직의 역지식이전은 기업성과에 부정적 영향을 제공하는 것 으로 나타났다. 이를 통해 본 연구는 역지식이전 과정에서 글로벌 기업의 형태적 통제기제와 사회 적 통제기제가 요구되고 있음을 제시하였다.

This study examines the development of the Association of Southeast Asian Nations (ASEAN)’s Self-Certification of Origin mechanism through two key phases. From 1993 to 2015, ASEAN strove to establish a common market and deepen economic integration. During this period, it introduced various pilot projects to enhance trade, streamline certification procedures, and experiment with trade facilitation initiatives. Following the official establishment of the ASEAN Economic Community in 2015, the focus shifted towards harmonizing trade procedures, enhancing regional coordination, and standardizing customs processes. These efforts culminated in the launch of the ASEANwide Self-Certification (AWSC) in 2020. In Vietnam, however, the implementation of AWSC has faced significant challenges. Despite these obstacles, the country has taken proactive steps to integrate AWSC into its trade system by issuing domestic regulations and guidance from regulatory authorities. This study explores the specific difficulties Vietnam faces in implementing AWSC and proposes recommendations to enhance its effectiveness.

In this study, proteins were extracted from sesame and perilla meals (agricultural by-products) by using hot-water defatting and acid precipitation, and their functional properties were compared with those of a commercial soy protein isolate (SPI). According to the SDS-PAGE results, the sesame meal protein extract (SMPE) exhibited a higher content of hydrophobic amino acids than the perilla meal protein extract (PMPE), alongside a relatively lower intensity of the 7S globulin band. SMPE showed 1.41-fold higher solubility than SPI at pH 10 and 1.72- and 1.66-fold higher emulsifying activity indices (EAIs) at pH 8 and 10, respectively. PMPE exhibited similar trends in solubility and EAI as SPI at the corresponding pH values. However, the emulsifying stability indices of SMPE and PMPE were lower than that of SPI. In particular, the fat absorption capacity of SMPE was significantly higher than those of SPI and PMPE, likely because of its higher content of hydrophobic or nonpolar amino acid residues. These results suggest that SMPE and PMPE are promising alternative protein sources for food applications and may promote value-added utilization of plant-derived by-products in the food industry.

The Indian Ocean is the second-largest tuna fishing ground in the world, accounting for approximately 1.2 million tonnes (23%) of the estimated 5.2 million tonnes of global commercial tuna catch in 2023. This study examined the relationship between tuna catches, specifically skipjack, bigeye, and yellowfin tunas, and prey biomass (Nautical Area Scattering Coefficient, NASC) estimated from acoustic surveys conducted in the southwestern Indian Ocean from 20 April to 15 May 2019. Environmental variables were derived from the Copernicus Ocean Model, and tuna length data from the IOTC. The estimated total tuna catch in the study area was approximately 166,400 tonnes, with the northwestern region showing the highest catches and NASC values. Tuna catches increased with NASC; however, the relationship was non-linear. While skipjack showed no significant correlation with NASC, bigeye and yellowfin tunas exhibited weak but significant positive correlations. Environmental analysis revealed that the northern waters had high surface temperatures, low salinity, and low oxygen levels, with mid and deep layers characterized by low temperature, salinity, oxygen, and chlorophyll. These findings offer a foundation for understanding tuna distribution in relation to prey and environmental conditions, highlighting the need for future species- and fishery-specific studies to support sustainable tuna resource management.