• Tribology and Lubricants
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• 제31권5호
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• pp.213-220
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• 2015

This study evaluates the effect of grooves on the stem part of a plunger on the lubrication characteristics of a fuel injection pump (FIP) by using hydrodynamic lubrication analysis. The current study uses the two-dimensional Reynolds equation to evaluate the changes in lubrication characteristics with variations in clearance, viscosity, and grooves for a laminar, incompressible, and unsteady state flow. This study investigates the lubrication characteristics by comparing the dimensionless minimum film thickness or the film parameter, which is the ratio of the minimum film thickness to surface roughness. The analysis method for the groove section differs depending on the depth of the groove. For instance, in the case of a shallow groove, the film thickness equation considers the depth of the groove, while in the case of a deep grove, it considers the flow continuity. The lubrication characteristics of the FIP are more sensitive to changes in the groove width than to changes in other design variables. Moreover, the application of a groove is more effective under low viscosity conditions. The smaller the distance from the edge of the stem part to the first groove in the case of shallow grooves, the better are the lubrication characteristics of the FIP. In contrast, in the case of deep grooves, the lubrication characteristics of the FIP improve as the distance increases. The application of shallow grooves is more effective for improving the lubrication characteristics than the application of deep grooves.

• 디지털융복합연구
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• 제12권6호
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• pp.171-180
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• 2014

최근 주요 기업들은 쇼핑 애플리케이션을 마케팅 전략으로 개발하여 이용하고 있으며, 이러한 전략을 효과적으로 실행하는데 무게를 두고 있다. 이러한 쇼핑 애플리케이션의 대표적인 요소들은 상호작용성 그리고 정보제공성, 이용편리성이 있다. 이에 본 연구는 애플리케이션의 특성이 애플리케이션의 선호도에 미치는 영향에 대해 실증적으로 분석하고, 소비자들의 가격민감도에 영향을 미치는 요인을 찾아 효과적인 쇼핑애플리케이션의 활용전략을 제시한다. 본 연구의 결과는 상호작용과 정보제공성, 이용편리성은 선호도에 긍정적인 영향을 미치는 것으로 나타났다. 또한 애플리케이션의 특징이 선호에 영향을 미칠 때, 가격민감도의 조절효과를 살펴본 결과, 가격민감도가 높은 집단에서는 정보제공성이 가장 유의한 영향으로 나타났고 다음으로 상호작용성과 이용편리성이 유의하다는 결과가 나타났다. 가격민감도가 낮은 집단에서는 정보제공성은 유의하지 않았다. 이러한 결과를 기반으로 기업의 마케팅적 시사점을 도출하였다.

• 정보처리학회논문지A
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• 제19A권3호
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• pp.155-160
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• 2012

본 논문은 기능성 게임의 주요소인 재미와 학습 그리고 본인의 게임 점수 향상을 통한 성취감 배양을 통해 언제 어디에서나 자투리 시간을 활용하여 수열 문제 학습 능력을 향상시킬 수 있는 스마트폰 기반의 수열 퀴즈 어플리케이션을 설계하였다. 또한 최근 대중화된 유비쿼터스 환경에서 기능성 게임을 통한 수열 문제에 대한 학습 효과를 검증하기 위해 여러 종류의 수열 문제들로 구성된 기능성 게임을 아이폰과 안드로이드 환경 기반으로 구현하고, 수열 게임 사용자들의 점수 기록을 바탕으로 사회통계학적 분류에 따른 게임 사용자 특성 및 학습 효과를 분석하였다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제4권9호
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• pp.283-288
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• 2015

하이브리드 클라우드 컴퓨팅 환경에서 많은 과학자들이 과학 응용을 수행하고 있으나, 클라우드 컴퓨팅 서비스를 제공하는 각 회사들의 자원 표기법이 상이하고 복잡하여 사용에 어려움이 따르고, 응용에 적합한 클라우드 자원을 선택하는 것이 어렵다. 클라우드 서비스 간에 상호 호환성을 제공해주는 하이브리드 클라우드 환경에서의 표준화된 자원 명세 표기법이 필요하다. 과학자들은 기존에 자신들이 수행했던 자원이나 가장 좋은 성능의 자원에서만 수행하려는 경향이 있어, 비용, 시간을 효율적으로 수행하면서 응용에 적합하고, 기존의 실험과 유사하게 진행할 수 있는 자원을 추천해주는 서비스가 필요하다. 하이브리드 클라우드 서비스의 표준화를 위해 인터클라우드 프로젝트가 진행되고 있으나, 과학 응용 실험에 적합한 자원의 선택을 위해 필요한 클라우드 자원의 특성들을 나타내는 데 한계가 있다. 본 논문에서는 하이브리드 클라우드 환경에서 시맨틱 클라우드 자원 서비스를 제안한다. 통계 기법으로 과학 응용의 특징에 따라 응용에 적합한 클라우드 자원을 그룹으로 분류하고 분류된 유사한 클라우드 자원 그룹을 가지고 시맨틱 클라우드 자원 추천 서비스 기법을 제공한다. 제안한 알고리즘을 통해 시맨틱 클라우드 추천 서비스 기법을 제공하면, 효율적인 자원의 가용성과 비용으로 응용을 수행할 수 있고, 응용에 적합한 클라우드 자원을 추천할 수 있다.

• 한국학교ㆍ지역보건교육학회지
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• 제6권
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• pp.117-126
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• 2005

This study attempted to extract a suggestive point to help the design of a program, which is used to promote physical activities, by applying a social cognitive theory based on literature review on the physical activity based on a social cognitive theory. This study considers 10 journal articles that used a social cognitive theory, physical activity, and exercise as the major variable using the EBSCOhost Academic Search Premier and Educator's Reference Desk (ERIC). The type of papers was analyzed using a certain criterion, which can be configured according to the number of each year's papers, characteristics of research subjects, application type of a social cognitive theory, and classification of the application of objects in a social cognitive theory. The characteristics of each year's papers presented no specific characteristics for each year's papers, but the study in 2004 especially presented a high level. The characteristics of research subjects presented four highest cases in the case of the college student, and there were zero cases for children. The application type of studies on physical activities using a social cognitive theory can be largely classified as three types. The results of the measurement using a sectional investigation for SCT objects were 2 cases, the application of SCT for promoting physical activities was 1 case, and the demonstration of evaluation for the effect of SCT objects presented 8 highest cases. Although the social cognitive theory in the characteristics of the classification of object applications can be classified as 10 objects, there were no cases that used 10 all objects, partial applications of the object were measured in 8 studies, and two cases presented no detailed considerations on the object. Most of studies used a part of the object where the application of self-efficacy were measured by 8 highest cases. In addition, there were no measurements on the situation, observation learning, answer and response, and self-management. The elements of attitude, cognitive activity, self-efficacy, and handicaps among the SCT object were commonly used, and studies that the self-efficacy largely affects on the promotion of physical activities presented the main current.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1347-1348
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• 2008

The efficacy and its degradation of light emitting diode(LED) are related to its PN junction's temperature(Tj). Currently efficacy in certain temperature and thermo-resistant are defined for the depending. However, the definitions are quite inconvenient for lighting application. The paper focuses on the issue and presents a method to evaluate the thermal characteristics of LED efficay.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 춘계학술대회
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• pp.137-144
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• 2004

Consumers require various quality characteristics including safety. The reduction of risk concerned on product safety becomes urgent issue in leading companies. The strategy for customer satisfaction by choosing attractive quality characteristic is not enough for risk reduction in view of producer. This paper presents a method for choosing quality characteristics and risk characteristics by integrating QFD based on quality requirements and AHP based on safety requirements, also shows its application for complex equipment.

• 한국응용과학기술학회지
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• 제38권5호
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• pp.1255-1264
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• 2021

본 연구는 코로나-19 환경에서 소비자가 인식하는 골프 어플리케이션(App)특성이 몰입정도와 소비행동에 관하여 인과 관계(SEM)를 적용하여 골퍼들이 인식하는 어플리케이션 서비스를 탐색하고, COVID-19 이후 골프산업을 예측하기 위한 기초자료를 제공하고자 하였다. 이를 위해 2021년 6월 1일 ~ 8월 10일까지 표본계획에 의해 모바일 서베이(URL)를 사용하여 총 235명을 분석에 사용했다. 결과를 도출하였다. 첫째, 어플리케이션의 이동성, 신뢰성 특성이 몰입증진에 통계적으로 유의미한 정(+)의 영향을 미치는 것으로 가설이 채택되었다. 둘째, 몰입증진은 소비행동에 통계적으로 유의미한 정(+)의 영향을 미치는 것으로 가설이 채택되었다. 마지막으로 어플리케이션의 정보성, 이동성 특성이 소비행동에 통계적으로 유의미한 정(+)의 영향을 미치는 것으로 가설이 되었다.

• 유통과학연구
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• 제14권2호
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• pp.93-101
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• 2016

Purpose - This study aims to advance our knowledge about factors influencing technical startup performance through analysing technical startup process empirically. This study was conducted to focus on industry structure(industry growth rate, competitive intensity, and enter barriers), technology characteristics(technical excellence and wide range of technical application), and the performance in the technology-based start-ups. Specifically, analyzing moderating effect of technology-marketing strategy, this studied how moderating variables affect technical startup performance under industry structure. Research design, data, and methodology - The subject of this study was technology-based start-ups company that received technology transfer from public organization. The development of the paper model is based on the literature of the preceding research analysis in technology commercialization, performance of technology-based start-ups, and marketing strategy. This study has a construct that was defined in the previous studies, such that technology marketing strategy was defined into the two ways of being broad or narrow in strategic application. From November 3. 2015 to December 22, 220 questionnaires were distributed with targeting to start-up companies in technology-based. 188 responses were collected for empirical analysis except the missing and wrong value responses. This data were used for structural equation modeling and regression analysis. Results - The results of this study are as follows. First, as industry structure variables influencing on performance(technical, financial) of technology-based start-ups, industry growth rate, competitive intensity and enter barriers of variables were verified; high growth rate has more positive effect on performance than low growth rate, competitive low intensity has more positive effect on performance than competitive high intensity, low enter barriers have more positive effect on performance than high enter barriers. Second, as technology characteristics variables influences on the performance(technical, financial) of technology-based start-ups, technical excellence and wide range of technical application of variables were verified ; technical high-excellence has more positive effect on performance than technology low-excellence, wide range of technical application has more positive effect on performance than narrow range of technical application. We also find that technology marketing strategy(broad/narrow) in moderating factors on performance (technical, financial) is as follows. Analyzing the moderating effect depending on technology marketing strategy(broad/narrow), application of technology, and the types of technology strategy(broad/narrow) were revealed that broad marketing strategy had a more significant effect on performance of technology-based start-ups. With AMOS, the relevancy of the study model revealed higher for broad technology-marketing strategy than narrow technology marketing strategy, and the explanatory power revealed to be 6.4% higher in broad marketing strategy than narrow marketing strategy. Conclusions - This study confirmed that industry structure and technology characteristics are important factors influencing the performance of technology-based start-ups. Technology-marketing strategy affects the performance of technology-based start-ups between industry structure and technology characteristics. According to additional analysis, moderating variables and technology-marketing strategy are important factors influencing the performance of technology-based start-ups under industry structure and technology characteristics. Broad type of technology-marketing strategy has more attractive industry structure and excellent technology characteristics than narrow types of technology-marketing.

• 교육시설 논문지
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• 제27권3호
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• pp.3-14
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• 2020

The purpose of this study is to discuss the planning direction of educational spaces to support children's healthy and creative learning based on bio_philic theory. This study analyzed the characteristics of the application of biophilic patterns in children's education space through case analysis. The conclusion of this study is summarized as follows. As a result of the analysis of children's classroom space, the pattern of 'A(Visual connection with nature), F(Dynamic & Diffuse Light), K(Prospect)' shows high application rate, but the pattern of 'C(Non-Rhythmic Sensory Stimuli), G(Connection with Natural Systems), I(Material Connection with Nature)' shows low application rate. In particular, there is a lack of connection with patterns such as hearing, smell, touch, taste stimulation and water experience, and curiosity through exploration of nature about 'B(Non-visual connection with nature), E(Presence of Water), N(Risk/Peril)' changes in nature and ecosystem. In the corridor and rest space, the pattern of 'A(Visual connection with nature), D(Thermal & Airflow Variability), F(Dynamic & Diffuse Light), G(Connection with Natural Systems), K(Prospect)' shows high application rate, but 'B(Non-visual connection with nature)' shows low application rate. In addition, the application of patterns related to the stimulation of curiosity through direct exploration of nature and the exploration of the patterns of 'E(Presence of Water), N(Risk/Peril)' is insufficient. Therefore, in the case of classroom spaces, the active use of nature as it is should be considered within the scope that does not cause visual confusion, and it should provide an area that can be experienced through the five senses. And corridors and rest spaces should be designed to introduce more active natural elements as spaces to recover stress caused by learning. In other words, the characteristics of children's education facilities need to be connected between classroom space, corridor, rest space and external space. This study is meaningful in that it analyzes and derives the application characteristics of 'biophilic design' which affects the 'Attention Restoration' of children's educational spaces through foreign cases.