• 대한치과보철학회지
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• 제25권1호
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• pp.195-204
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• 1987

The purpose of this study was to investigate the effect of occlusal splints on the masseteric silent period and the changes of the masseteric silent period after experimental bruxism with occlusal splints. In nine subjects, anterior occlusal splints were fabricated. The jaw-jerk reflex was induced by tapping over mandibular symphysis area with solenoid driven hammer and electromyogram of left masseter muscle was recorded. In the recorded electromyogram of left masseter muscle the silent period duration was measured. This procedure was done before insertion of anterior occlusal splints, after insertion of anterior occlusal splints, after 30 min experimental bruxism with anterior occlusal splints, and 3hr after removal of anterior occlusal splints. The result were as follows; 1. The mean silent period duration was increased after insertion of occlusal splints compared with the mean silent period duration before insertion of occlusal splints. 2. There was no change of the mean silent period duration after 30 min experimental bruxism with occlusal splints compared with the mean silent period duration after insertion of occlusal splints. 3. 3hr after the removal of occlusal splints, the mean silent period duration showed no difference from the mean silent period duration before insertion of occlusal splints.

• 한국실내디자인학회논문집
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• 제41호
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• pp.19-28
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• 2003

Residential space can be stated as a decisive body compositely affected by environmental, physical, social, and cultural influences. Resulting from this idea, residential space can be defined as a mirror reflecting peoples' life at that period. Therefore, it is possible to understand the social and cultural aspects of a certain era through analyzing the residential space built and used at that period. Viewing from this point, latter term of Chosun Period, as a transitional period, was a tie of collapse for the structure of middle-class society forcing its identity system to be reorganized, and of improving upon commerce, agriculture, and manual industry to enable modernization. Following this idea, the goal of this research is to analyze characteristics of higher middle class residences built at the close of 19th century in Gyeonggi province in order to bring into light the change of social structure of the period.

• 수산경영론집
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• 제42권2호
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• pp.113-130
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• 2011

The laver has been cultivated long time ago by Korea and Japan. Korean Laver Industry has been influenced by Japan on the many factors since 20th. Nevertheless now the both country showed widening disparities across the aspect of total Laver Industry each other. The development steps of Korea and Japan Laver Industry have been advanced differently. That is, we can keep the Laver Industry development steps of both countries separate by 4 steps. But insignificant of every step against both countries has been dissimilar. We can separate from 4 steps in Korea, 1 step is origin period from beginning of laver cultivation to 1961. Next step is First Development period from 1962 to 1978. This period come out production increase from about 10,000 tons early 1960 to 50,000 tons late 1970. Next step is Second Development period from 1979 to 2000. This period come out eminent production increase from about 50,000 tons early 1980 to 200,000 tons late 1990. Next step is Stabilization period from 2001 to now. This period come out production control the size of its production and enlargement of Laver Export. We can also separate from 4 steps in Japan, 1 step is origin period from beginning of laver cultivation to 1944. Next step is Development period from 1945 to 1975. This period come out production increase from about 4 billion sheets early 1960 to 8.5 billion sheets 1975. Next step is Peak period from 1976 to 1982. This period come out sustainable production peak by 6~8 billion sheets and high price. Next step is Decline period from 1983 to now. This period come out production control the size of its production and sustainable price down. These differences showed out facing problems of Korean and Japanese Laver Industry differently. In case of Korea, the facing problems show out 3. First is structural problem, for example, trouble between original laver producer and the finished producer by dry laver products. Second is Insufficiency of Plants Protection System. Third is low quality of Laver. In case of Japan, the facing problems also show out 3. First is sustainable decrease of laver consumption. Second is change of mind against laver, for example, the change of the propensity to consume, and decrease of brand power. Third is Influence of global system. The difference of development steps of Korea and Japan Laver Industry show out 2 point of view to us. First we need consider positive strategy against laver production system of enlargement. Second, we need consider separate strategy against high quality laver and low quality laver.

• 천문학회보
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• 제10권
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• pp.5.3-6
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• 1985

• 대한지리학회지
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• 제23권
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• pp.37-48
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• 1981

• 한국공간구조학회논문집
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• 제9권2호
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• pp.83-90
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• 2009

기존에 공간구조물의 동적거동에 관한 대부분의 연구는 수치해석적 방법을 이용하여 지붕구조의 동적거동 파악을 위주로 하고있다. 그러나 실제 공간구조물의 지붕구조는 기둥 또는 벽체와 같은 하부구조에 의해 지지되므로 지진발생시 상부구조의 동적거동은 하부구조에 따라서 많은 영향을 받는다. 본 연구에서 아치구조물에 대한 하부 기둥구조의 재질을 황동과 폴리카보네이트로 하고 각각의 단면 및 길이 변화와 상부 지붕구조의 추가질량에 따른 고유주기 변화특성을 파악하고자 한다. 기둥의 강성 및 추가질량의 변화에 대하여 고유주기의 변화율이 상대적으로 크게 나타났다. 즉 하부 기둥구조의 강성이 상부 지붕구조의 강성과 비교하여 매우 큰 경우에 기둥구조의 강성변화나 지붕구조의 질량변화에 따른 공간구조물의 고유진동수 변화가 거의 없다.

• 한국관개배수논문집
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• 제19권1호
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• pp.64-76
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• 2012

Recently, it has been increased disaster of crops and agricultural facilities with climate change such as regional storm, typhoon. However agricultural facilities have unsafe design criteria of improving drainage corresponding to this change. This study has analyzed the impact that inundation area and magnitude of drainage-facility is decided based on fixed- and unfixed-duration precipitation by applying revised design criteria of drainage for climate change. The result was shown that 1-day and 2-days rainfall for 20-years return period has increased about 11.4%, 4.4% respectively by changing fixed- to unfixed duration. And the increase rate of design flood was 15.0%. The result was also shown that Inundation area was enlarged by 6.6% as well as increased inundation duration under same basic condition in designed rainfall between fixed- and unfixed-duration. According to the analysis, it is necessary for pump capacity in unfixed-duration to be increased by 70% for same effect with fixed-duration. Therefore, when computing method of probability precipitation is changed from fixed one to unfixed-duration by applying revised design criteria, there seems to be improving effect in drainage design. Because 1440-minutes rainfall for 20-years return period with unfixed-duration is more effective than 1-day rainfall for 30-years return period with fixed-duration. By applying unfixed-duration rainfall, capacity of drainage facilities need to be expanded to achieve the same effects (Inundation depth & duration) with fixed-duration rainfall. Further study is required for considering each condition of climate, topography and drainage by applying revised design criteria.

• 패션비즈니스
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• 제8권5호
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• pp.31-40
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• 2004

The purpose of this study is to investigate the change of the physical properties, bending and luster properties, which are related to the touch and appearance of silk fabrics modified by the degumming process. The silk has long been known as one of the most elegant and soft textile materials. The raw silk yarn, or cocoon bave, spun from the spinneret, is rather stiff due to the sericin covering the two fibroins together. The sericin can be removed during a degumming process. The removal of the sericin would result in remarkable change in the physical properties of the raw silk fabrics, including luster of the fabrics, which process parameters could possibly be utilized to adequately control the silk fabric properties. The KES(Kawabata Evaluation System) is a testing methodology that has been used with considerable success for predicting the hand and tailorability of apparel fabrics. This study uses one of the KES, bending tester, to measure the bending properties of the silk fabrics degummed for specified period to change the physical/mechanical properties of the fabric. The KES bending measurement revealed that the bending rigidity decreased for both the warp and weft direction of the silk fabrics with the increase of the degumming period. It has been shown in this study that the some of the hand-related physical properties, including the bending rigidity, drapability, and luster, could be modified with the change in the degumming period.

• 산업진흥연구
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• 제6권3호
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• pp.1-8
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• 2021

본 연구는 코로나19 시기 제조기업의 경영실적 현황과 고용 전망에 관한 연구로서 분석 자료는 통계청 마이크로 데이터 통합서비스 포털에서 제공하는 제조업 대상 2020년 3분기, 4분기 경기조사를 바탕으로 분석하였으며 대기업 83개 업체, 중소기업 435개 업체를 분석 자료로 활용하였다. 분석 결과를 요약하면 다음과 같다. 기업 규모별 경영 실적이 고용창출에 미치는 변화는 거의 없는 것으로 분석되었다. 2021년 경기 전망 분석에서 대기업은 매출액은 증가할 것으로 분석되었지만 고용 창출에서는 66.3%가 거의 변화가 없었으며, 중소기업은 매출액 부분에서 31.3%가 거의 변화가 없다와 30.3%는 증가할 것이라는 경영실적 전망을 보였으나 고용 창출에는 58.9%로 거의 변화가 없는 것으로 분석되었다. 따라서 코로나19 시기에 기업의 경영실적에 변화가 없음을 알 수 있다. 즉, 대기업과 중소기업에 팬데믹 현상이 제조업 고용과 경영실적에는 큰 영향을 미치지 못하고 있다는 점에서 시사점을 찾을 수 있다.

• 산업진흥연구
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• 제9권2호
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• pp.163-174
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• 2024

본 연구는 사회변화와 의례 변화의 관계성을 분석하고 그 연관성에 의해 유교상례와 현대의례의 차이점을 밝히고자 하는 데 목적이 있다. 또한 시대별 의례의 변화과정을 제도의 변화와 연결하여 살펴보았다. 상례의 시대구분을 전근대기 '유교상례'와 일제강점기를 통한 '근대 상례기' 그리고 1999년 건전가정의례준칙의 시행과 함께 의례 자본에 의한 '현대 상례기'로 구분하여 분석하였다. 의례의 이해는 시대구분을 통해 전통의 계승이라는 논리적 모순에서 벗어나 전근대에서 근대상례, 현대상례로 이어지는 과정을 통해 이해되어야 할 것이다. 본 연구에서는 한국인의 죽음에 대한 인식은 의례의 변화와 지속이라는 관점에서 볼 때 시대상을 반영하여 지속되고 있음을 고찰하는 데 의의가 있다.