• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권8호
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• pp.2140-2156
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• 2023

The Wireless Sensor Network (WSN), is constructed out of teeny-tiny sensor nodes that are very low-cost, have a low impact on the environment in terms of the amount of power they consume, and are able to successfully transmit data to the base station. The primary challenges that are presented by WSN are those that are posed by the distance between nodes, the amount of energy that is consumed, and the delay in time. The sensor node's source of power supply is a battery, and this particular battery is not capable of being recharged. In this scenario, the amount of energy that is consumed rises in direct proportion to the distance that separates the nodes. Here, we present a Hybrid Firefly Glow-Worm Swarm Optimization (HF-GSO) guided routing strategy for preserving WSNs' low power footprint. An efficient fitness function based on firefly optimization is used to select the Cluster Head (CH) in this procedure. It aids in minimising power consumption and the occurrence of dead sensor nodes. After a cluster head (CH) has been chosen, the Glow-Worm Swarm Optimization (GSO) algorithm is used to figure out the best path for sending data to the sink node. Power consumption, throughput, packet delivery ratio, and network lifetime are just some of the metrics measured and compared between the proposed method and methods that are conceptually similar to those already in use. Simulation results showed that the proposed method significantly reduced energy consumption compared to the state-of-the-art methods, while simultaneously increasing the number of functioning sensor nodes by 2.4%. Proposed method produces superior outcomes compared to alternative optimization-based methods.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권3호
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• pp.916-937
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• 2023

Most of the existing Distributed Denial-of-Service mitigation schemes in Software-Defined Networking are only implemented in the network domain managed by a single controller. In fact, the zombies for attackers to launch large-scale DDoS attacks are actually not in the same network domain. Therefore, abnormal traffic of DDoS attack will affect multiple paths and network domains. A single defense method is difficult to deal with large-scale DDoS attacks. The cooperative defense of multiple domains becomes an important means to effectively solve cross-domain DDoS attacks. We propose an efficient multi-domain DDoS cooperative defense mechanism by integrating blockchain and SDN architecture. It includes attack traceability, inter-domain information sharing and attack mitigation. In order to reduce the length of the marking path and shorten the traceability time, we propose an AS-level packet traceability method called ASPM. We propose an information sharing method across multiple domains based on blockchain and smart contract. It effectively solves the impact of DDoS illegal traffic on multiple domains. According to the traceability results, we designed a DDoS attack mitigation method by replacing the ACL list with the IP address black/gray list. The experimental results show that our ASPM traceability method requires less data packets, high traceability precision and low overhead. And blockchain-based inter-domain sharing scheme has low cost, high scalability and high security. Attack mitigation measures can prevent illegal data flow in a timely and efficient manner.

• Membrane and Water Treatment
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• 제14권2호
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• pp.85-93
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• 2023

Membrane separation is widely used for several applications such as water treatment, membrane reactors and climate change. Cross-linked organic-inorganic hybrid polyvinylidene fluoride (PVDF) / Tetraethyl orthosilicate (TEOS) was adopted for the preparation of optimized hollow membrane (HFM) for membrane distillation or other low pressure separators for mechanical properties and permeability under varying pretreatment schemes. HFMs were prepared on semi-pilot membrane fabrication system. Novel adopted post-treatment schemes involved soaking in glycerol, magnesium sulphate (MgSO₄), sodium hypochlorite (NaOCl), and isopropanol for different durations. All fibers were characterized for morphology using a scanning electron microscope (SEM), surface roughness using atomic force microscope (AFM), elemental composition by examining Energy Dispersive Spectroscopy (EDS), water contact angle (CA°) and porosity. The performance of the fibers was evaluated for pure water permeation flux (PWF). Post-treatment with MgSO₄ gave the highest both tensile modulus and flux. Assessment of properties and performance revealed comparable results with other organic-inorganic separators, HF or flat. In spite of few reported data on post treatment using MgSO₄ in presence of TEOS, this proves the potential of low cost treatment without negative impact on other membrane properties. The flux is also comparable with hypochlorite which manifests substantial precaution requirements in actual industrial use.The relatively high values of flux/bar for sample treated with TEOS, post treated with MgSO₄ and hypochlorite are 88 and 82 LMH/bar respectively.

• 무역학회지
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• 제43권2호
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• pp.23-45
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• 2018

본 연구는 물류성과가 개발도상국으로 유입되는 FDI에 미치는 영향에 대하여 분석하였다. 분석결과 물류 성과지표 중에서 운송 인프라와 화물의 적시성은 저소득 국가로의 FDI에 통계적으로 유의하게 정(+)의 영향을 미치는 것으로 나타났다. 또한 중소득국가를 대상으로 분석한 경우에는 화물의 적시성만이 FDI에 유의하게 부(-)의 영향을 미치는 것으로 나타났다. 이러한 차이는 저소득국가와 중소득국가로 이루어지는 FDI의 성격이 다르기 때문이다. 저소득국가로 이루어지는 FDI는 저임금에 기초한 생산비절감을 위한 것이고, 중소득국가의 경우는 생산비절감을 위한 FDI와 소비시장 확대를 위한 FDI가 복합적으로 이루어지고 있기 때문이다. 무역비용(Trade Cost)의 일부로 볼 수 있는 물류성과지표는 무역뿐만 아니라 오프쇼어링을 목적으로 하는 FDI 유입에까지 영향을 미치고 있다고 할 수 있다.

• 자원리싸이클링
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• 제32권1호
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• pp.60-66
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• 2023

공급망 관리가 산업의 지속적 성장의 핵심 요소가 되면서 국가적 차원에서 또는 기업적 차원에서 원료가 되는 광물자원의 확보가 중요해지고 있다. 그리고 산업구조에 따라서 광종별 경제적 위상과 공급리스크가 상이하다. 본 연구에서는 광종별 경제적 위상을 살펴보고 위해, 산업별 수요구조와 비용, 비중 등을 반영하여, 광물자원별 국내 산업 경제중요도를 정량할 수 있는 지수(index)를 개발하고 산정하였다. 그 결과 Li, Al, Cu, Si, Co, Ni 등이 우리나라의 산업적 중요도가 높은 것으로 평가되었다. 또한 산업별로 1차금속제조·일반기계·조립금속은 Al, Cu, Zn, Pb 등 베이스메탈이, 정밀기기는 Sn, Ba, Ti이, 반도체는 Si, Ga이, 전자부품은 Li, Ni, Co, Si 등이 산업적 중요도가 높은 것으로 분석되었다. 이러한 결과를 바탕으로 공급망 리스크 등을 추가적으로 반영하여 핵심광물 등을 선정.관리하고 이를 확보하기 위한 전략을 마련해야 할 것이다.

• 한국프랜차이즈경영연구
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• 제9권4호
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• pp.45-56
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• 2018

Purpose - Consumers perceive various risks while using food service franchise stores. Food service franchise stores offer consumers not just menus, but services, physical environment, and prices, which can be perceived as risk to consumers. This means that consumer behavior in foos service franchise stores needs to be studied based on perceived risk theory. Perceived risk consists of performance risk, financial risk, social risk, psychological risk, and time risk. The purpose of this study is to investigate the effects of perceived risk on satisfaction and trust, and in turn affect loyalty. The results of this study will provide guidelines for marketers to develop strategies to reduce the perceived risk of consumers. Research design, data, methodology - In order to achieve research purposes, the authors developed several hypotheses. Data were through online survey through an online survey firm. A questionnaire survey was distributed to customers who have visited the restaurant in the past three months. The survey was conducted from March 5, 2017 to October 14, 2017. A total of 1,500 people were e-mailed and 260 were returned. A total of 245 items were used in the analysis except 15 of the questionnaire. Data was analyzed by using SPSS 21.0 and AMOS 21.0. Results - The findings of this study are as follows: First, performance risk, economic risk, and psychological risk had negative effects on satisfaction. Social and time risks did not affect on satisfaction. Performance risk and time risk had negative impact on trust. Second, economic, social, and psychological risks did not affect trust, but satisfaction had significant positive effect on trust and loyalty. Third, satisfaction had positive effect on loyalty. Conclusions - The implications of this study are as follows. First, food service franchise marketers should increase their customer loyalty by establishing a risk reduction strategy. Second, there are various risks to customers visiting the store. Therefore, marketers need to analyze the perceived risks of customers. Third, it is also necessary to eliminate the perceived risks of customers. In addition, a restaurant franchise company needs to find a reasonable way to reduce the material cost and present a reasonable menu price.

• 문화기술의 융합
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• 제9권2호
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• pp.285-294
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• 2023

미국과 중국의 무역분쟁은 코로나 전부터 시작하고 범유행(pandemic) 속에 새로운 변화를 가져와 이때 완화되고 있는데 중국 제조업 산업 발전으로 미중 무역 간 상호의존도가 높아졌다. 하지만 글로벌 전체 무역량이 팬더믹 전보다 적다. 코로나19 팬더믹 이후 미국과 중국 공급망의 변화에 대한 분석한 다음에 그 상황에 대한 한국의 대응 방안에 대한 구체적으로 제시하고자 한다. 하지만, 요즘 새로운 변화가 다시 일어나고 있다. 2022년 하반기에 중국 상하이에서 코로나19가 발생하면서 중국 산업사슬에 새로운 변화가 일어날 것으로 보인다. 중국 정부가 코로나19 방역수치를 엄격하게 작성하면서 업계 중 상당수 공장과 기업들이 당분간 문을 닫을 수밖에 없는 상황이지만 2023년에 현재 전 세계적으로 나라들이 코로나 상황이 좋아지고 있다. 그 변화하는 상황 속에서 중국은 핵심 과학기술의 연구개발 역도를 강화하고, 국제와 국내의 이중 사이클을 통해 혁신 생태계의 활력을 북돋아 글로벌 공급사슬의 상류로 이동시켜야 한다. 이럴 때 한국은 미국과 좋은 무역동반자 관계를 최대한 유지하면서 공급망에서 장점을 발휘하여 자신의 위치가 확고해야 한다.

• 한국의류산업학회지
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• 제25권1호
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• pp.41-51
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• 2023

This study attempted to analyze the context characteristics and consumer characteristics that affect fashion curation shopping. The data used for this study were 223 questionnaires targeting male and female college students in their 20s in Busan and South Gyeongsang Province who had had the curated shopping experience in the latest three months. The SPSS program was used for the data analysis, and a reliability measurement, factor analysis, multiple regression analysis, T-test, and one-way ANOVA were conducted. The results were as follows. First, fashion curation shopping exhibited three factors: product subscription, marketing use, and product recommendation shopping. Furthermore, the context characteristics had sub concepts of five factors: selection, sharing, experience, discovery, and storage. Second, the context characteristics (selection, sharing, experience, discovery, and storage) had a significant influence on product subscription, marketing use, and product recommendation, which belong to the curation shopping category. Third, the fashion consumers' price sensitivity, trend sensitivity, and product knowledge had a deep impact on the marketing use and product recommendation. Fourth, there was no difference in the fashion curation shopping by male and female consumers and the average monthly fashion shopping frequency, and there were differences in shopping cost and time. This study can analyze the context and consumer characteristics that affect fashion curation shopping to establish an efficient fashion curation shopping system in practical terms. Additionally, academically, it can be proposed as basic data on the development of measurement tools for analyzing consumer behavior that prefers fashion curation shopping.

• Asia Marketing Journal
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• 제15권1호
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• pp.23-42
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• 2013

To overcome the profitability challenge these days, many global banks are increasingly focusing on cost efficiency through more efficient banking processes, such as online and mobile banking, whereas a number of other banks choose to differentiate their services for retaining and attracting the most valuable customer segment (Deloitte, 2011). While global banks in the retail banking industry are adopting either of these two business models as a strategic choice for their long-term growth, KB Kookmin Bank, one of the leading retail banks in South Korea, has begun to operate 'KB Rockstar' as a strategic channel, particularly designed to target college students in the youth market. The new marketing strategy has resulted in a positive impact on its brand image in customers' perception as well as a drastic increase in the number of youth customers. In this study, we analyze the case of 'KB Rockstar' and summarize the key factors for its success from a marketing perspective. First, 'KB Rockstar' is not simply a good channel strategy, but an innovative marketing strategy that aligns place, product and promotion together in order to create a synergy effect, resulting in the successful implementation of the bank's targeting strategy. Second, the strategy effectively establishes 'KB Rockstar' as a brand targeted to youth customers while also competently strengthening the image of the corporate brand, KB Kookmin Bank. The skillful implementation of organically combined marketing mix strategies has enabled the successful launch of the bank's sub-brand. Third, the strategy considers a retail bank branch as not only the place that makes sales transactions in order to generate short-term profits, but also the place that builds a long-term relationship with customers in order to maximize their lifetime values in the long run.

• 한국항행학회논문지
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• 제27권5호
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• pp.519-527
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• 2023

공중발사는 전투기 등 항공기에서 발사되는 방식으로, 비용 절감 및 발사 시 환경/날씨 영향을 적게 받는 등 다양한 이점이 있다. 그러나 현재 국내 개발된 공중발사 기반 위성 발사체는 없다. 해외 민간 업체와 다양한 국가에서 운용/ 개발 중인 공중 발사 기반의 위성발사체 및 위성 요격 미사일을 살펴봄으로써 국내 연구/개발의 필요성을 확인하였다. 위성발사체 설계 및 발사 플랫폼 별 개발 방안 등 다양한 연구가 국내 산학위주로 수행된 것을 확인했다. 항공기가 고고도, 고속, 고자세각으로 상승 기동할 때 공중 발사되는 상방발사 기술 개발 방안을 제시하였다. 이때, 안전 분리 검증을 위한 풍동 시험에 대하여 소개한다. 분리 안정성 확보를 위한 풍동 시험 중 하나인 drop test 수행을 위해 새로운 개념의 시험장을 제안하였다.