• 한국정밀공학회지
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• 제17권6호
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• pp.76-82
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• 2000

This paper describes the machining characteristics of cylindrical plunge grinding. The study investigates the process using the current signals of a spindle motor through a hall sensor. Grinding experiments were conducted under various conditions such as wheel speeds, workpiece speeds and infeed rates with a conventional vitrified bonded wheel. Analyzing the current signal of the spindle motor, a relationship between current signals and the metal removal rate in terms of the in(red rate is induced. It was also shown that a hall sensor has similar capabilities in evaluation of grinding behavior compared to the AE signals, which are useful far monitoring the grinding process.

• 전기화학회지
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• 제11권4호
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• pp.309-312
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• 2008

In an attempt to achieve high rate capability of cell, a new composite cathode was prepared by mixing host compounds with MWCNTs and Super P carbon. Because MWCNTs generally have bundle-type morphologies, it is not easy to get completely separated form. Successful dispersion of divided small bundles between the host particles keeps electrochemical contacts among the particles and plays a significant role in the buffer action as a volume-change absorber. Relative amounts and distributions of the additives are important for design of the electrode for high power application of lithium ion batteries.

• 한국항만경제학회지
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• 제22권3호
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• pp.141-160
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• 2006

급변하는 해운물류환경에 대응하여 해운기업들이 경쟁적 우위를 획득하기 위해서는 무엇보다 자신들의 서비스 역량을 강화하는 노력이 필요하다. 이를 위해서는 정기선사의 물류서비스 속성(attributes)에 대한 정확한 이해와 함께, 이들 속성간의 상대적 중요성을 평가하여야 한다. 본 연구는 선행 연구에 대한 검토를 통하여 정기선사의 다양한 물류서비스 속성을 추출하고, 31명의 해운전문가에 대한 설문조사를 통하여 6개로 축약된 주요물류속성의 상대적 중요도와 선사별 성취정도에 대한 자료를 취합하였다. AHP(Analytic Hierarchy Process) 기법을 적용하여 핵심평가요인들의 상대적 중요도를 측정한 후 Fuzzy 모형을 이용하여 2개 국적선사와 5개 외국적 선사를 대상으로 핵심평가요인들에 대한 상대적 역량을 평가하였다. 분석 결과 국적선사들은 전체적인 성과에 있어서 상위 수준인 것으로 평가되었는데, 고객서비스 측면에서 외국적 선사에 비해 통계적으로 유의한 수준에서 우수한 것으로 나타난 반면, 운임 경쟁력 부문에 있어서는 통계적으로 유의적이지는 않지만 상대적인 열위를 나타내었다. 본 연구는 국적 선사들이 경쟁적 우위의 두 가지 원천인 비용(cost advantage: 운임경쟁력)에서는 열위에 있지만, 차별화(differentiation advantage: 고객서비스)에서는 높은 수준의 우위를 점유하고 있어 전반적으로 우수한 성과를 나타내고 있음을 보여주고 있다.

• 국제지역연구
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• 제16권1호
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• pp.197-220
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• 2012

한국 중소기업 해외자회사의 투자성과 차이를 가져오는 주요 경영관리역량은 무엇이며, 이들 경영관리역량을 구축하는데 영향을 미치는 요인은 무엇인가? 이를 파악하기 위해 베트남 호치민 지역을 방문하여 21개 기업의 경영자들을 1-2시간 동안 인터뷰한 다음, 경영자원론에 의거하여 도출한 분석모델에 따라 사례를 작성 및 분석하였다. 분석결과 유능한 관리자 확보, 원활한 의사소통 체제, 안정적인 노사관계 구축, 공장가동률 제고와 하청활용, 자사특유의 품질관리 시스템, 적기자금조달, 지역사회와 좋은 관계 구축 및 관련 공무원들과의 우호적인 관계 구축 등과 같은 경영관리역량이 주요한 영향을 미치는 것으로 분석되었다. 또한 경영관리역량을 향상시키는 요인들은 사전진출 경험과 지식뿐만 아니라 지속적인 학습, 단계적인 성장, 뛰어난 경영관리 시스템 등으로 분석되었다. 따라서 한국 중소기업들은 베트남 투자성과를 높이기 위해 사전진출 경험과 지식을 충분히 축적하여야 하며, 진출 이후에도 지속적인 학습을 바탕으로 환경변화에 맞게 주요 경영관리역량을 향상시켜 나가야 할 것이다.

• 대한기계학회논문집B
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• 제26권8호
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• pp.1055-1061
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• 2002

A numerical and experimental study on the flow fields behind the fan outlet was carried out to improve the performance of a conventional fan-sink(fan and heat sink). Conventional fan-sinks have a heat sink of which fin configurations tend to increase the flow resistance, thus decreasing the performance and the cooling capabilities of a fan-sink. Lifting surface method is used for the prediction of flow fields behind the fan outlet. Oil-dot flow visualization technique is applied for the validation of numerical results. The numerical results and experimental data show agreement each other. A conventional heat sink is modified and redesigned using flow patterns behind the fan outlet. The newly designed heat sink has the configuration of curved fins which minimize flow resistance. It showed improvements in both cooling: capabilities and volumetric flow rate compared to the conventional one.

• Journal of Ubiquitous Convergence Technology
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• 제2권1호
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• pp.51-55
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• 2008

A digital home is a ubiquitous environment that is expected to be realized in the near future. All information appliances in a house are connected to each other through wired and/or wireless home networks. Authenticated user can access the various services provided by the digital home, and the access is not restricted by equipment, time, or location. The technologies that form the digital home can be grouped into two categories: wired networking technologies and wireless networking technologies. For the purpose of ubiquitous environments, wireless-networks offer suitable and seamless high-quality services. A wireless LAN can be created simply by equipping a single access point. For that reason, the cost of establishing such a network is low and using it is easy. Of course, there is an exciting new wireless technology. It is the Ultra Wide Band (UWB). However, it is not enough to bring wireless convenience, although offering a broad range of high-speed data transfer capabilities, Because of unstable. Thus, of the wireless-networking systems, we focus on the wireless LAN. We quantitatively analyze its capabilities. The dynamic and adaptive wireless LAN provides a foundation for the evolution toward the next generation of wireless and adaptive networks. The difference between wired LAN and wireless LAN in upload and download rates is small. Although the wireless LAN experiences a greater loss rate than the wired LAN, the difference is minimal. We conclude that a wireless LAN is suitable for use in an apartment environment.

• 대한가정학회지
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• 제45권1호
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• pp.91-99
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• 2007

The purpose of this study was to determine a is finding the process for the development of professionals in the foodservice industry. The Questionnaire used in this study was designed to measure the capabilities of professional foodservice employees, investigate the importance and accomplishments of curriculum of the major subject, and determine areas matters of the for improvement in the of field. It was distributed to 101 professors (include lecturers) of foodservice departments, from February 1 to 28, 2006. A total of 101 usable questionnaires were received amounting to a 100 percent response rate. Statistical data analysis was completed using SPSS Win(11.0) for frequency, t-test, one sample t-test, and IPA(importance performance analysis). The results were as is follows. Regarding the As regard capabilities of professional foodservice employees, they remarked that the fair values and creative thinking are the most important. Regarding the curriculum of the major subject, generally the importance degree is higher than the accomplishment degree. The areas improvement are as follows: development of curriculum, securing the excellent faculty, academic-industrial cooperation, expanding and improving the university facilities in university, and increasing the experience during the term.

• 한국유기농업학회지
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• 제29권1호
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• pp.1-23
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• 2021

The form of agri-food transaction has taken a rapid change from the existing method since Covid-19. In response to changes in the market environment such as Covid-19, the integrated marketing organization in Jeollabuk-do was diagnosed from the point of view of innovation, and the future direction was examined. In order to improve the distribution structure of the production area, an integrated marketing organization was fostered, and both quantitative and qualitative growth were brought about. However, some regions still lack willingness to participate and lack of expertise. In particular, there is no infrastructure and strategy to prepare for the increase in non-face-to-face transactions post Covid-19. Online transactions also require economies of scale, so non-face-to-face transaction capabilities must be reinforced by adding a separate organization and experts in charge of online transaction functions within the integrated marketing organization. In the future, online sales are highly likely to expand not only to transactions between producers and individual consumers (C to C), but also to mass consumer (B to B) transactions. It will be an opportunity. In addition, it is necessary to efficiently use production area distribution facilities such as sorting and packaging. Since the non-contact transaction method will increase after Corona 19, it is necessary to strengthen marketing capabilities such as expansion of utilization rate, order placement, settlement, and customer management, and reorganization of specialized organizations.

• 한국IT서비스학회지
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• 제21권1호
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• pp.61-79
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• 2022

In the rapidly changing era of knowledge revolution, user-centered IT services are emerging as a very important component of modern business. However, in order to lead IT services into success, traditional capabilities and competences are not good enough. Development of IT services involve service planners and designers as well as traditional systems developers. This detailed segmentation of job and corresponding competences among involved in IT service development brings in new type of conflicts and contradictions that may require special attention for IT services to be properly development and implemented. This study aims to explore and define competences and roles of newly emerging job groups in IT services: planners, designers, and developers. In order to identify underlying competences of these emergeing groups, two stage interviews were conducted. At the first stage, general competence framework is developed across these groups with different skills for similar competence catogories. Using the categories developed at the first stage, members of each groups were asked to rate and assess the competences of other groups. Comparisons of these reciprocal assessment revealed the conceptual differences and biases across these groups. Detail differences are discussed and implications are discussed.

• 한국콘텐츠학회논문지
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• 제21권9호
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• pp.704-713
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• 2021

본 연구의 목적은 지역사회에서 감염병 발생 및 확산에 영향을 미치는 감염병 취약지표의 상대적 가중치를 평가해보는 것이다. 이를 위해 선행연구 및 사례 고찰을 기반으로 감염병 취약지표를 확산취약시설, 감염취약 계층, 사회적 취약여건, 대응능력 4개의 부문으로 분류한 후, 각 부문별로 총 24개의 세부지표를 선정하였다. 그 후 22명의 전문가를 대상으로 계층분석과정(AHP)을 이용하여 각 지표들 간의 상대적 가중치를 산정하였다. 분석결과, 부문별 가중치는 확산취약시설이 가장 높게 나타났으며, 부문별 지표와 세부지표를 모두 고려한 종합 가중치는 병상확보율(1순위), 종교시설 밀도(2순위), 의료인력 비율(3순위), 고령자 비율(4순위), 유흥업소 밀도(5순위) 순으로 나타났다. 이러한 결과는 지자체의 감염병 대응정책 수립에 필요한 근거자료를 마련하는 데에 활용 가능할 것이다.