• Education of Primary School Mathematics
• /
• v.21 no.2
• /
• pp.209-221
• /
• 2018

Angle concepts have a multifaceted nature such as quantitative aspects as the amount of rotation, qualitative aspects as geometric shapes, and relationship aspects made with planes or lines. This study analysed angle concepts and introduction methods of angles in elementary mathematics textbooks which have been used from the Syllabus Period to the 2015 Revised Mathematics Curriculum. First, the concepts of angles in mathematics textbooks focus through the definitions, representations, and components of angles presented in mathematics textbooks are analyzed. Secondly, how various aspects of each angle are sequenced through the tasks or activties in the introduction of lesson is looked. As a result of analysis, the methods of introducing angles in the changes of mathematics textbooks have mainly focused on learning about geometric shapes and relations of components. In the mathematics classroom, students should experience various aspects of geometric shapes, rotations, relational aspects of points, lines and surfaces, and support and link them to form a wide range of concepts.

• Journal of Power System Engineering
• /
• v.13 no.6
• /
• pp.22-28
• /
• 2009

열역학 제 2법칙의 관점의 열역학적 가용에너지인 엑서지 해석법을 적용하여 가솔린, 메탄올, M90 연료를 사용한 전기점화 기관의 성능해석을 수행하였다. 열역학적 사이클 해석을 위하여 사이클을 구성하는 각 과정은 열역학적 모델로 단순화하였고, 크랭크 각도에 따른 실린더의 압력과 작동유체를 구성하는 연료, 공기 및 연소생성물의 열역학적 물성 값들을 이용하여 각 과정에서의 엑서지와 손실 일을 계산하였다. 실험데이터는 단기통 전기점화기관을 가솔린, 메탄올과 M90(메탄을 90%+부탄 10%의 혼합연료)을 연료로 WOT(Wide Open Throttle), MBT(Minimum advanced spark timing for Best Torque), 2500rpm 조건으로 운전하여 측정하였다. 계산에 이용한 자료는 실험으로 측정한 크랭크 각도에 따른 연소실의 압력, 흡입공기와 연료유량, 흡입공기 온도, 냉각수 온도와 배출가스 온도 등이다. 이를 이용하여 각 과정에서의 엑서지와 손실 일을 계산하였으며 각 과정에서의 손실 일은 연소과정에서 가장 크며 팽창과정, 배출과정, 압축과정 및 흡입과정 순으로 크게 나타났다.

• Journal of Industrial Convergence
• /
• v.22 no.2
• /
• pp.1-12
• /
• 2024

This study investigates what decisions have an impact on bank performance. A panel regression analysis was conducted using data from the financial statements of banks located in the United States from 2013 to 2022, and the effects of explanatory variables were examined through hierarchical panel regression analysis divided into financial decision-making and management decision-making. In addition, by analyzing performance separately from the creditor and shareholder perspectives (hereinafter referred to as overall) and from the shareholder perspective alone, it suggests which elements should be utilized and how to improve performance from each perspective. When a panel regression analysis was performed using only liquidity and stability, dependency on deposits and the interest coverage ratio had a statistically significant impact from the perspective of overall performance, and the debt ratio also had a statistically significant impact from the perspective of shareholder performance. When adding non-technical factors, only the labor cost ratio among non-technical factors was found to be statistically significant from the overall performance perspective, and although the non-technical factors were not statistically significant from the shareholder performance perspective, the cash ratio was found to have a statistically significant impact. Lastly, when adding technical innovation elements, the intangible asset ratio was not statistically significant from the overall performance perspective, but was significant from the shareholder performance perspective. The significance and implications of this study are that there are differences in factors that can affect the performance of overall or shareholder and that various decision-making factors can affect a bank's performance.

• 한국공간정보시스템학회:학술대회논문집
• /
• 1999.06a
• /
• pp.231-246
• /
• 1999

일반적으로 스키마 통합이란 각 응용들의 관점에 따라 다르게 표현된 스키마들을 하나의 스키마로 통합하는 것을 말한다. GIS 데이타베이스는 일반 데이타베이스와는 달리 개체에 대한 속성 정보 뿐만 아니라 기하 등과 같은 공간 정보를 가지고 있다. 특히, GIS 응용에서 정의된 개체들의 공간 표현은 관점에 따라 다양한 기하 서브스키마들로 표현된다. 따라서 GIS 데이타베이스를 위한 스키마 통합에서 서로 다른 기하 서브스키마들을 통합하는 것이 무엇보다 중요하다. 본 논문에서는 GIS 데이타베이스의 스키마통합을 위해서 기하 서브스키마들의 통합 문제를 중점적으로 다룬다 먼저 기하 서브스키마들의 통합에서 발생하는 충돌들을 개체의 기하를 중심으로 동일 개체간의 기하 충돌과 다른 개체간의 기하 충돌로 분류하여 정의한다. 그리고 이 충돌들을 해결하기 위한 충돌 해결 방법으로 각 충돌들의 특성을 고려하여 상위 레벨의 기하 서브스키마 선택, 기하의 다중 표현, 구성 요소의 공유, 개체들 간의 상세화 등을 제시한다. 또한, 통합된 스키마에 대하여 가상 스키마를 표현하는 방법을 제시하여, 통합되기 전의 스키마들을 통합된 스키마로부터 유도될 수 있음을 보인다. 본 논문에서는 GIS 데이타베이스 스키마를 기술하기 위하여 ISO/TC211의 개념적 스키마 언어인 EXPRESS-G를 이용한다.

• Journal of Korea Game Society
• /
• v.10 no.1
• /
• pp.47-56
• /
• 2010

This study analyzes MMORPG in user's desire perspective and tried to find specific motivation factors. In research result, character has been separated in user character, another user character, boss monster and support character. And character's factor analysis yielded three factors: visual attraction, psychological propensity and competence. The result of the regression analysis about character's motivation factor show that it is significantly different that motivation level and motivation factors from each character. This finding implies that specific motivation factors can serve to make strategy for motivate user's game playing.

• Culinary science and hospitality research
• /
• v.21 no.5
• /
• pp.119-128
• /
• 2015

The purpose of this study is to develop and test a model that explains the potential influences of: 1) consumers' values, 2) their attitudes toward green practices and/or environmental concerns, and, 3) "green hotel" visit behaviors. In addition, the study will clarify how these variables relate to each other. The findings of this study will further our understanding of what drives green hotel visit behaviors and will provide insights for public policymakers and industry marketers.

• Journal of Digital Convergence
• /
• v.13 no.8
• /
• pp.145-151
• /
• 2015

In this study, we analyze using a structural equation model if an appropriate composite relations among the perspectives(Learning & Growth, Internal Business Process, Customer, Financial perspective) of the balanced scorecard are formed to achieve the ultimate goal in Chinese SMEs. In this study, we find that Learning & Growth perspective is related positively to Financial perspective directly and indirectly via Internal Business Process and also find that for success the careful management is required for Learning & Growth and Internal Business Process perspective. The results of this study will provide information about where the need to emphasis on management to improve the financial performance in Chinese SMEs.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.53 no.5
• /
• pp.47-54
• /
• 2016

In the underwater environment, high resolution can be achieved in the range direction by transmitting and receiving a signal of a particular band and/or waveform. The design of a transmit signal used in the active sonar is very important in order to detect a cylindrical object within a short distance less than 1 km, which is the detection distance of this paper. Designing a transmit signal optimal to a sonar requires appropriate selection of its center frequency and bandwidth, which allows the maximum detection distance of a sonar. In this paper, in terms of maximizing echo excess and signal to noise ratio (SNR), optimum frequency analysis is carried out under various conditions of diverse parameters. In addition, the investigation focused on the determinating a bandwidth is also performed for the purpose of satisfying the performance requirement of range resolution and azimuth resolution.

• Archives of design research
• /
• no.16
• /
• pp.27-38
• /
• 1996

Environmental design is the process of creating and suggesting a new culture retlectmg the spirits and scientific know ledges of an age, so il is important for a designer, who deals environment, to perceive the present trend of science, The goal of this study is to suggest a way to recover the vanishing image in current urban environment from the viewpoint of changing world-view, The process of this study is as follows. 1. According to spatial hierarchy, the role of each space and the importance of each space in correlation with human are considered. 2. The method to undersk, nd the space from the viewpoint of new paradigm and the direction of environmental design's access are suggested. 3. The notion that introduction of semi public space In urban environment is consistent with new paradigm is demonstrated and the semi public space's role of stimulation of urban activity is emphasized. The result of this study shows a possibility that semi public space, introduced by understanding of a space on the basis of new paradigm, expands the territory of life and overcomes tile negative environmental problem like disorder, increase of entropy.

• Proceedings of the Korea Contents Association Conference
• /
• 2008.05a
• /
• pp.343-347
• /
• 2008

There are two kind of system in hotel for evaluating management. the first is infra system, for example Front management system - reservation system, C/I, C/O system, POS system , web system, call center management -, Back office system, interface system, and so on which manage direct control for hotel, and next is strategic system, for example BSC , CS . which is supporting hotel management. The purpose of this study was to find using the Balanced Scorecard to evaluate hotel management perfomance. Management performance is based on productivity, quality, time, effect, and responsiveness. Hotel economic value is not equal visual asset which is measured financial value. It is include hotel brand, image, customers who have good loyalty, employees who give customers special service, and systems which was affected by internal process. In conclusion, innovation, growth, internal system process, empioyee and customer have effect hotel performance. Therefore hotel has to know non-financial performance which has positively relate to financial performance.