• Composites Research
• /
• 제32권5호
• /
• pp.243-248
• /
• 2019

As demand of light weight in the automotive industry has increased, the cowl cross member has been investigated using various methods to change the material. Conventionally, a cowl cross member has been made of steel and aluminum, but recently researchers tested multi-material such as aluminum and plastic. We studied a new model of the cowl cross member made of composite and non ferrous materials. For products with a high degree of freedom in design, generally, the method of topology optimization is advantageous and for the partial bracket part of the cowl cross member had a degree of freedom in the design, a topology optimization is appropriate. Considering the characteristics of the cowl cross members, we need research to minimize the weight while having the performance of noise, vibration and harshness(NVH). Taking the mounting status of the product into consideration, we used an assembly model to optimize the cowl cross member. But this method took too much time so we considered simple cowl cross member assemble conditions using the direct matrix input method(DMI) with the Craig-Bampton Nodal Method. This method is capable of considering the status of the assembly without assembling the model, which reduced the solving time and increased the accuracy comparison with a cowl cross member without DMI.

• 산업경영시스템학회지
• /
• 제42권2호
• /
• pp.49-61
• /
• 2019

As the technological gap amongst manufacturers decreases, the life cycle of products has shortened, and competition accelerates due to the development of technology, incumbent manufacturing companies face growth limitations. In order to overcome such business issues, manufacturing companies are increasingly interested in changes in business models and innovations, especially in the direction of providing services where they can maintain the competitive advantage of their products. In such context, this empirical study examines managerial leadership, differentiation strategies, and products and services pricing as 'servitization factors', which can be driving forces for moving into a new era of growth for Korean SMEs, focusing on the mediating effects of servitization competency. The results are as follows : First, it was confirmed that executive leadership, differentiation strategy, and information & communication technology capability have a direct effect on service sales. Second, the process competency, partnership competency, and ICT competency, which are presented as the service competence of SMEs, were found to play an important role in inducing service sales in managerial leadership, differentiation strategy, product and services pricing. It also emphasized the role of the public policy such as helping to foster SMEs as key partners in the expansion of social facilities and establishing platforms through ICT and data utilization for the convergence of manufacturing services.

• Journal of Electrochemical Science and Technology
• /
• 제10권2호
• /
• pp.104-114
• /
• 2019

Energy is an essential driving force for modern society. In particular, electricity has become the standard source of power for almost every aspect of life. Electric power runs lights, televisions, cell phones, laptops, etc. However, it has become apparent that the current methods of producing this most valuable commodity combustion of fossil fuels are of limited supply and has become detrimental for the Earth's environment. It is also self-evident, given the fact that these resources are non-renewable, that these sources of energy will eventually run out. One of the most promising alternatives to the burning of fossil fuel in the production of electric power is the proton exchange membrane (PEM) fuel cell. The PEM fuel cell is environmentally friendly and achieves much higher efficiencies than a combustion engine. Water management is an important issue of PEM fuel cell operation. Water is the product of the electrochemical reactions inside fuel cell. If liquid water accumulation becomes excessive in a fuel cell, water columns will clog the gas flow channel. This condition is referred to as flooding. A number of researchers have examined the water removal methods in order to improve the performance. In this paper, a new water removal method that investigates the use of vibro-acoustic methods is presented. Piezo-actuators are devices to generate the flexural wave and are attached at end of a cathode bipolar plate. The "flexural wave" is used to impart energy to resting droplets and thus cause movement of the droplets in the direction of the traveling wave.

• 정보보호학회논문지
• /
• 제14권5호
• /
• pp.141-151
• /
• 2004

전자상거래의 활성화에 따라 이동매체의 안전에 대한 요구사항이 늘어나고 있다. 이동매체간의 호환성을 제공하기 위해서는 보안 API(Application Programming Interface)가 쉽고 안전하게 설계되어져야한다. 현재 많은 제품과 개발에 호환성과 확장성 표준을 제시하고 있는 RSA사의 PKCS(Public Key Cryptographic Standard) #11 인터페이스를 선택하여, 국내 전자서명 표준인 KCDSA(Korean Certificate-based Digital Signature Algorithm) 메커니즘을 제공하고자 한다. 그리고, PKCS #11 보안 API에 새로운 키 관리 함수를 정의하므로써 보다 더 안전한 키 관리 기능도 지원한다. KCDSA 개인키와 공개키의 객체 속성과 템플릿을 정의하고, KCDSA 메커니즘으로 전자서명을 생성하고 검증할 수 있도록 한다. KCDSA 메커니즘을 제공하는 PKCS #11을 설계 및 구현하여 성능평가하고, 보안성 및 호환성에 대하여 비교분석한다.

• 유통과학연구
• /
• 제20권8호
• /
• pp.59-67
• /
• 2022

Purpose: This study identifies how twelve key success factors of distribution strategies for community enterprises in Thailand achieve higher performances. Research design, data, and methodology: The samples in this study were 400 entrepreneurs throughout the country. The instrument for data elicitation was a questionnaire. The descriptive and inferential statistics for data analysis were percentage, mean, standard deviation, T-Test, F-Test, multiple regression, and multiple correlations. Results: The results revealed that, overall, the samples showed high opinions on online distribution strategies in all aspects. In detail, the three highest factors were as follows: 1) electronic satisfaction, 2) product characteristics and electronic trust, and 3) the quality and success in online distribution. In detail, the three highest aspects of online distribution success were customer loyalty, financial performance, and work management, respectively. The online distribution strategies influencing community enterprises' success were electronic trust, electronic loyalty, social information, electronic satisfaction, and online distribution tools, which had a statistical significance of 71. Conclusions: This research has made an essential contribution to community enterprise entrepreneurs should focus on and adopt these 8P+4ODS concepts to increase sales, maintain brand loyalty of existing customers, get new customers, develop learning, and improve the working potentials of community enterprise entrepreneurs.

• Asia Marketing Journal
• /
• 제2권3호
• /
• pp.64-89
• /
• 2000

기업의 사활은 신제품개발의 성공여부에 달려 있다. 이러한 필요성과 중요성에 비추어볼 때, 국내에서의 신제품 성공 요인에 관한 연구는 그 기반이 미흡한 실정이다. 고로, 본 연구의 목적은 신제품 성공요인을 파악하고 이들 성공요인간의 관계를 유추해 보는 것으로 한다. 본 연구논문은, Day & Wensley 의 SPP(Source-Position-Performance) 연구모형을 바탕으로 국내 화장품시장을 중심으로 설문 조사한 결과, 11 개 기업에서 총 159 부를 수집하여 연구 모형 및 연구 가설을 검증하였다. 그래서 다음과 같은 사실을 밝혀냈다. 첫째, 신제품개발 과정에서 마케팅 능력이 직접적으로 제품차별화에 긍정적인 영향을 미치고 있다는 사실과 둘째, 임직원 몰입도가 부서간 통합에 유의한 영향을 미치고 있다는 사실이다. 그리고 셋째, 기술 능력이 단순히 뛰어나다 해서 제품을 차별화 시킬 수는 없다는 사실과 넷째, 부서간 통합정도가 직접적으로 제품차별화롤 가져올 수는 없었는데 이러한 결과는 부서내 커뮤니케이션의 부족 및 부서간 갈등 둥으로 인한 것으로 분석된다. 마지막으로, 제품의 차별화가 신제품 성과에 매우 유의한 영향을 미치고 있다. 본 연구결과를 종합해 보면, 제품이 출시되기 전에 철저한 시장 특성 및 동향을 파악하여 제품을 만들어야 한다는 사실이다. 기술 능력이 회사마다 평준화되어 있는 상황에서 무엇보다 필요한 것은 정확한 소비자 조사 및 이를 바탕으로 한 신제품개발이다. 또한 신제품개발과정에서 최고경영자 및 마케팅 담당자들은 주관적인 판단보다는 기업의 마케팅 능력에 따른 객관적인 판단에 따라 행동해야 한다. 특히 화장품시장에서는 브랜드마케팅에 의해 더욱 차별화시킬 수 있다는 사실이다. 단순한 제품에 생명력을 불어넣는 것이 마케터의 역할이다. 기업은 단순히 제품만을 파는 것이 아니라 소비자들에게 제품이상의 것을 판다, 그래서 소비자의 마음속에 정확하게 자사 제품을 포지션닝하는 것이 무엇보다 중요하다는 사실이다.

• Earthquakes and Structures
• /
• 제26권2호
• /
• pp.117-130
• /
• 2024

Probabilistic model of seismic demand is the main tool used for seismic demand estimation, which is a fundamental component of the new performance-based design method. This model seeks to mathematically relate the seismic demand parameter and the ground motion intensity measure. This study is intended to use Bayesian analysis to evaluate the accuracy of the seismic demand estimation of Steel moment resisting frames (SMRFs) through a completely Bayesian method in statistical calculations. In this study, two types of intensity measures (earthquake intensity-related indices such as magnitude and distance and intensity indices related to ground motion and spectral response including peak ground acceleration (PGA) and spectral acceleration (SA)) have been used to form the models. In addition, an extensive database consisting of sixty accelerograms was used for time-series analysis, and the target structures included five SMRFs of three, six, nine, twelve and fifteen stories. The results of this study showed that for low-rise frames, first mode spectral acceleration index is sufficient to accurately estimate demand. However, for high-rise frames, two parameters should be used to increase the accuracy. In addition, adding the product of the square of earthquake magnitude multiplied by distance to the model can significantly increase the accuracy of seismic demand estimation.

• 드라이브 ㆍ 컨트롤
• /
• 제21권1호
• /
• pp.16-21
• /
• 2024

The yaw gearbox is a key device in a wind power generator that improves power generation efficiency by rotating hundreds of tons (400 to 600 tons) of nacelle so that the blade reaches 90 degrees in the wind direction. Recently, installation sites have been advancing from land to sea as they have become super-large at (8-12) MW to increase the economic feasibility of wind power generators and utilize excellent wind resources, and the target life of large wind power generators is 25 to 30 years. The yaw gearbox of 6 to 12 sets is installed in a very complex place inside the nacelle on the tower with parallels, and it is important to secure the reliability of the yaw gearbox because if a failure occurs after installation, it costs tens to hundreds of times the price of a new product to restore. In this study, equivalent loads were calculated by analyzing failure mode and field data, accelerated life test conditions were established, and a test device was constructed to perform the accelerated life tests and performance tests to ensure the reliability of the gearbox.

• Human Ecology Research
• /
• 제62권1호
• /
• pp.1-13
• /
• 2024

This study analyzed the current operational status, business continuity, and business continuity strategies of 11 Soho fashion shopping malls through a longitudinal case study (2019/2020 and 2022/2023). The aim was to determine how Soho fashion shopping malls are continuing their business having been successfully established in the fiercely competitive current online fashion market. Regarding changes in shopping mall operation status, all cases displayed changes in items, distribution channels, marketing channels, core values, and profit structures. After establishing the businesses, a crisis arose due to the COVID-19 pandemic, leading to difficulties in creating new customers. Moreover, there was excessive business expansion, resulting in saturation of the online platform store market. This meant companies were experiencing reduced sales (5) or difficulties in maintaining their business (3). However, there were differences in the direction of overcoming the crisis and continuing or converting the business. These revealed that to continue the business after successful establishment of an online fashion shopping mall, it is essential to have the expertise of entrepreneurs, work performance, and marketing ability, as well as differentiation capabilities such as product power and management strategy and core competitiveness that provides a relative advantage over other shopping malls. Customized government support at the level of the start-up ecosystem is also essential for the survival and business continuity of a SOHO online fashion shopping mall with poor human and material resources.

• 분석과학
• /
• 제37권2호
• /
• pp.114-122
• /
• 2024

A transmission Raman spectroscopy-based quantitative model, which can analyze the content of a drug product containing naproxen sodium as its active pharmaceutical ingredient (API), was developed. Compared with the existing analytical method, i.e., high-performance liquid chromatography (HPLC), Raman spectroscopy exhibits high test efficiency owing to its shorter sample pre-treatment and measurement time. Raman spectroscopy is environmentally friendly since samples can be tested rapidly via a nondestructive method without sample preparation using solvent. Through this analysis method, rapid on-site analysis was possible and it could prevent the production of defective tablets with potency problems. The developed method was applied to the assays of the naproxen sodium of coated tablets that were manufactured in commercial scale and the content of naproxen sodium was accurately predicted by Raman spectroscopy and compared with the reference analytical method such as HPLC. The method validation of the new approach was also performed. Further, the specificity, linearity, accuracy, precision, and robustness tests were conducted, and all the results were within the criteria. The standard error of cross-validation and standard error of prediction values were determined as 0.949 % and 0.724 %, respectively.