• 산업기술연구
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• 제12권
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• pp.3-13
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• 1992

The purpose of this study is to investigate the historical changes in popular house form of chuncheon city. 177 samples of the houses built in the period of 1951~1992 were selected. The house structure, size, equipment system were analyzed as well as material, color and types of roof along the historical development.

• 대한수학교육학회지:수학교육학연구
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• 제9권1호
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• pp.133-150
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• 1999

In this study, we tried to make histo-genetic analyses necessary to identify epistemological obstacles on the function concepts. Historical development on the function concept was analysed. From these analyses, we obtain epistemological obstacles as follows: the perception of changes in the surrounding world, mathematical philosophy, number concepts, variable concepts, relationships between independent variables and dependent variables, concepts of definitions.

• 한국가구학회지
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• 제23권2호
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• pp.130-143
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• 2012

The rapid increase in apartments of Korea brought about overall changes in the life style, and definitely played the biggest role to convert into western style. Since 1960, furniture has been changed for 50 years along with apartments, but furniture companies and the academic world had insufficient historical materials and lack of study. In addition, considering the changing trend according to residents' life style, the data of furniture industries should be collected to study every year or in 5 years at least. Therefore, this study aims to provide basic data that gives historical materials or design clues based on recent AV equipment-oriented storage furniture in the living room that prioritized design in public space. Accordingly, the study looked into the periodical trends of Korean furniture industries, analyzed 10 furniture companies in Korea which is actively doing business as the sample and arranged key points of periodical changes of furniture in the table, and suggested the conclusion according to the image map, style, color, material, and function.

• 영어어문교육
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• 제6호
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• pp.75-88
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• 2000

There are many reasons why foreigners have difficulties learning English. In addition to the difference between English and the learner's grammar, the large number of irregularities found in English become another obstacle to learning English. Understanding the difference and the irregularities will help us not only have a good command of English but also teach English more effectively. Many irregular or alternating patterns, or even anomalies in Modern English are the results of historical changes. In this paper, I would like to focus on some of the irregular or alternating patterns found in different components of the grammar of English and to show how they can be accounted for historically. Through this study, I would like to show that the irregular patterns and anomalies in English were once regular and systematic, they have deviated from the regular patterns of the grammar as time has gone by, and they have survived in Modern English as irregular and alternating patterns. Many of the irregular or alternating patterns can be traced back by phonological, morphological and/or semantic changes in the history of English. Finally, by looking at language history, we can hold a more tolerant view on many anomalies present in English.

• 디지털산업정보학회논문지
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• 제6권3호
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• pp.203-209
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• 2010

Since information systems are pervasive in the business and non-business areas, the issue of extending researches on information systems to knowledge systems and e-business systems is one of the most profitable topics of researches. We propose a historical, discontinuous changes introducing ambiguity in explaining and interpreting innovative nature of three paradigms of systems: information systems, knowledge systems, and e-business systems. Resorting to the historical perspective in developing ideas into meaningful themes, we proposed a discrete continuity in interpreting changes of paradigms of systems. Discrete continuity may be explained by ambiguously-shared meaningful perspectives applied to different paradigms of systems and interpretive elements of each system. The discrete continuity has been adopted to make ambiguity utilized have instrumental contribution in researches. The engrafted ambiguity in systems design, development, and use could have enduring instrumental value in interpreting the types or variants of systems in each paradigm of systems.

• The Korean Journal of Pain
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• 제22권1호
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• pp.99-103
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• 2009

We studied the historical changes of intervertebral disc displacement using magnetic resonance imaging. The phenomenon of the spontaneous regression of herniated discs is well known. The case of a 40-years-old male presenting with a large disc herniation at L5-S1, experiencing severe sciatic pain, and having the straight leg raising test positive at 25 degrees is presented. The extruded disc was documented by clinical examination. He was treated conservatively with epidural steroid injection (ESI), medication, physical therapy and self-exercise and reevaluated in 10 weeks later, 30 and 1 year. Large extruded disc can be treated successfully by physical therapy with ESI. However, the degeneration and the dehydration of disc result in decrease of disc height. Consequently, the regression of extruded disc might have been due to the resorption and the dehydration.

• 수완나부미
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• 제9권2호
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• pp.35-49
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• 2017

This paper will concentrate on how various particular Southeast Asian conditions created a distinct Southeast Asian cultural identity despite a very challenging geographical and historical diversity in the region. The paper will argue that Southeast Asians demonstrate an ability to adapt to changes and new values but also exhibit fatalism through a very high degree of passive acceptance to political and other changes that affect their society. The paper identifies a degree of environmental and geographical uniqueness in Southeast Asia that shapes context and gives rise to very distinct cultural traits. The historical transformation in the region brought about by colonialism and nationalism, combined with this geographical and political make-up of the region, had an immense impact on Southeast Asian society as it fostered adaptability. Finally, the political transitions brought about by various conflicts and wars that continued to affect the area in rapid succession all throughout the 20^th century likewise contributed immensely to a local Southeast Asian fatalistic response towards change. Historically, Southeast Asia demonstrated these socio-cultural responses to such an extent that these are argued to permeate the region forming a distinct aspect of Southeast Asian culture.

• 한국해양공학회지
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• 제20권6호
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• pp.54-60
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• 2006

This study discusses characteristic of spatiotemporal changes of the sand barrier in the Nakdong estuarine for the last century, focusing on geomarphologic evolution and mobility of sand barriers in the view of coastal engineering. The Nakdong estuarine, the research subject, has a complexly changing natural environment by interaction between ground and marine elements such as ocean wave, tidal current, sediment, etc. Moreover, recently, unnatural geomorphologic changes (e.g., seaside reclamation, new harbor construction, etc.) has been radically increased in this area with increasing desire for coastal development. Because of this, its sand barrier has developed quite unstable condition. Therefore, to identify the development process of geomorphologic changes in this area, required is a close examination on historical characteristics of spatiotemporal changes of the sand barrier in relation to surrounding seaside reclamation and physical environmental changes. This study, based on the marine charts published in between 1927 and 1995 year, analyzes the length and area of the sand barrier for the last hundred years, and investigates the cause of the changes by looking into the change of water depth for the last two years and doing ocean-physical site observations. In conclusion, the sand barrier of the Nakdong estuarine expands toward the open sea by $7.4{\sim}26m$ in annual average, maintaining a fixed distance of $1,241{\sim}1.279m$, and its area is expected to increase about $2.8km^2$ annually. This is characterized by the wocean wave from the open sea and the discharge of Nakdong River.

• 대한설비공학회지:설비저널
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• 제24권6호
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• pp.613-627
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• 1995

• 천문학회지
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• 제36권spc1호
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• pp.75-81
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• 2003

Changes in the earth's climate depend on changes in the net sunlight reaching us. The net depends on the sun's output and earth's reflectance, or albedo. Here we develop the limits on the changes in the sun's output in historical times based on the physics of the origin of solar cycle changes. Many have suggested that the sun's output could have been $0.5\%$ less during the Maunder minimum, whereas the variation over the solar cycle is only about $0.1\%$. The frequencies of solar oscillations (f- and p-modes) evolve through the solar cycle, and provide the most exact measure of the cycle-dependent changes in the sun. But precisely what are they probing? The changes in the sun's output, structure and oscillation frequencies are driven by some combination of changes in the magnetic field, thermal structure and velocity field. It has been unclear what is the precise combination of the three. One way or another, this thorny issue rests on an understanding of the response of the solar structure to increased magnetic field, but this is complicated. Thus, we do not understand the origin of the sun's irradiance increase with increasing magnetic activity. Until recently, it seemed that an unphysically large magnetic field change was required to account for the frequency evolution during the cycle. However, the problem seems to have been solved (Dziembowski, Goode & Schou 2001) using f-mode data on size variations of the sun. From this and the work of Dziembowski & Goode (2003), we suggest that in historical times the sun couldn't be much dimmer than it is at activity minimum.