• 한국콘텐츠학회논문지
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• 제12권11호
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• pp.313-337
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• 2012

본 연구는 최근 들어서 전시회가 활성화됨에 따라 각 전시회는 참관객에게 많은 관심과 만족도를 높이기 위하여 온갖 심혈을 기울이고 있다. 이에 전시회의 물리적 환경과 체험 등에 관한 선행연구들을 바탕으로 연구모형을 도출하고 가설을 설정하였다. 본 연구모형에서 체험의 제공수단으로 물리적 환경이 체험요소에 어떠한 영향을 미치는지를 분석하고, 체험요소가 참관객의 만족도에 어떠한 영향을 미치는지 본 연구에서 규명하여 참관객들의 방문을 증가시키기 위한 체험 요소를 확인하고 참관객의 만족을 높이는 방안을 참가업체에게 유용한 정보를 제공하고자 한다. 전시회의 물리적 환경(접근성, 매력성, 청결성, 편리성, 쾌적성, 인적 서비스)을 독립변수로 설정하였고, 체험(감각적, 감성적, 인지적, 행동적, 관계적 체험)을 매개변수로 하여 참관객의 만족도를 규명하였다. 이를 종합하면 전시회의 물리적 환경은 체험에 영향을 미치며, 체험은 참관객의 만족도에 영향을 미치는 것으로 나타났다. 따라서 전시 주최자들은 전시회를 개최하는데 있어서 각각의 물리적 환경과 체험요소를 충분히 검토하여 참관객의 만족도를 높여야 할 것이다.

• 한국농공학회지
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• 제44권4호
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• pp.139-148
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• 2002

Pilot study was performed to examine the feasibility of the pond system for further polishing of treatment wetland effluent from December 2000 to June 2001. The wetland system used for the experiment was highly effective to treat the sewage during the growing season, but it was less effective and its effluent was still high to discharge to the receiving water body. Therefore, the wetland effluent may need further treatment to prevent water quality degradation. Pond system could be used to hold and further polish the wetland effluent during the winter season and ots feasibility was evaluated in this study. Additional water quality improvement was apparent in the pond system during winter season, and the pond effluent could be good enough to meet the effluent water quality standards if it is properly managed. Timing of the pond effluent discharge appears to be critical for pond system management because it is a closed system and whole water quality constituents are affected by physical, chemical, and biological pond environments. Once algae started to grow in mid-April, constituents in the pond water column interact each other actively and its control becomes more complicated. Therefore, upper layer of the pond water column which is clearer than the lower layer my need be discharged in March right after ice cover melted. In the experiment, water quality of the upper water column was markedly clear in March than ant other times probably because of freezing-thawing effect. The remaining lower water column could be further treated by natural purification as temperature goes up or diluted with better quality of wetland effluent for appropriate water uses. This study demonstrated the feasibility of pond system for subsequent management of wetland effluent during the winter season, however, more study is needed for field application.

• 한국초등과학교육학회지:초등과학교육
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• 제27권3호
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• pp.221-232
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• 2008

The purpose of this study was to compare the written tests of the science lessons at elementary schools with the instructional objectives of the teachers' guide for the first term of the 5th grade by using Klopfer's taxonomic system. In the analysis of the instructional objectives in the teachers' guide, A.0(40.0%) and $B.0{\sim}E.0$(42.4%) showed high level but the proportion of processes of F.0(5.6%), G.0(4.0%), H.0(4.0%), and I.0(4.0%) showed low level, while in the written tests A.0 was 54.8%, $B.0{\sim}E.0$ was 36.1%, F.0 was 7.3%, and G.0 was 1.8% but H.0 and 1.0 was not taken at all. In the comparison with the instructional objectives in the teachers' guide about the domain of the knowledge and the comprehension showed hish and the processes of the scientific inquiry showed relatively low. The results of this study suggested that a desirable written test should be made to consider elementary science curriculum and instructional objectives and hold up rates of each behavior category between the instructional objectives of teachers guide and assessment objectives of written tests.

• 한국한의학연구원논문집
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• 제15권2호
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• pp.1-19
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• 2009

Some researchers who once studied Uirimchualyo have paid good attention to the connection between Donguibogam & Uirimchualyo because of their similarity. So, after reviewing the Sequel of Uirimchualyo, in terms of its editing purpose and the list of contents, especially focused on throat sickness, here I report on the conclusions I come to. Firstly, the Sequel of Uirimchualyo was a monumental edition in concert with the enthronement of Kwanghaegun, and printed at demand of new medical knowledge, which was required to add to the existing Uirimchualyo, written by best-noted doctor, Yang Yesoo, and in need of simpler medical textbook to help people's recovery from the damage of Japanese invasion in the year of Imjin & Jeongyoo. Secondly, all the contents read in the Sequel of Uirimchualyo, were quoted from Kogumuigam, compiled by Kong Shin, Manbyonghoichun, edited by Kong Jeonghyun, Dangaeshim bupbuyo, published by Bang Kwang, and Uihakipmun, edited by Lee Cheon. Thirdly, The reason of similarity between Uirimchualyo and Donguibogam is that the Sequel of Uirimchualyo was made by adding new medical knowledge to the existing Uirimchualyo, and that many of contents of the Sequel of Uirimchualyo were quoted in Donguibogam. Fourthly, regarding throat sickness, medical knowledge on acute fever was supplemented in the Sequel of Uirimchualyo, and the emergency medical treatment methodology like "blow-in-throat" was newly introduced. This treatment is worth being employed to treat acute suffocation with swollen throat in modern acute-infection sicknesses. Fifthly, the Sequel of Uirimchualyo made up for brief description of the existing Uirimchualyo, offered more convenience of users compared with too overscaled Hyangyakjipseongbang & Uibangryuchui, and was more complete than Kookupbang which was loose, incomplete, and sometimes risky. And it took firm hold before Donguibogam, and eventually made a great contribution toward Donguibogam.

• KSBB Journal
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• 제7권1호
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• pp.59-65
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• 1992

외부 순환식 공기리프트 반응기에서 기상유속과 액상의 점도를 변수로 하여 기체체류량과 액체의 순환시간, 혼합시간, 순환속도 및 축방향분산계수를 측정하여 다음과 같은 결론을 얻었다. 1. 기체체류량은 기체유속이 증가함에 따라 증가 하였으며, 점도가 증가함에 따라서는 약간 감소하는 경향을 보였다. 또 기체유속이 증가함에 따라 상승관에서는 기체체류량의 증가율이 감소한 반면 하강관에서는 증가하였다. 2. 기체유속이 증가함에 따라 순환시간 및 혼합시간은 초기에 급격히 짧아지다가 거의 일정한 값을 나타내었으며, 액체의 점도가 증가함에 따라 순환기산과 혼합시간은 모두 증가하였다. 3. 순환 액체의 속도는 기체의 속도에 따라 초기에 급격히 증가하나 기체속도가 약 5cm/sec이상이 되면 그 증가율이 매우 둔화되었으며, 점도가 증가함에 따라 약간 감소함을 알 수 있었다. 또한 압력수지식으로 예측한 이론값과 실험값은 낮은 기체유속 영역에서는 잘 일치하였으나 기체유속이 증가함에 따라 실험값이 이론값보다 작은 값을 나타내었다. 4. 기체유속이 증가함에 따라 Bodenstein number는 감소하였고, 축방향분산계수는 증가하였으며, 점도가 증가함에 따라 약간 감소하는 경향을 보였다. 본 실험범위에서 분산이 많이 일어나mixed folw에 근접함을 알 수 있었다.

• 한국통신학회논문지
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• 제30권1A호
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• pp.104-112
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• 2005

본 논문에서는 고속, 저전력 8-비트 ADC를 설계하는 기법들을 제안하였다. 비교적 적은 전력 소모를 가지면서 고속으로 동작 시키기 위해 기존의 파이프라인 구조인 MDAC를 이용한 폐쇄형 구조 대신에 개방형 구조를 채택하였다. 또한 Distributed THA와 캐스캐이드 형태의 구조를 이용하여 높은 샘플링 속도에 최적화 하였다. 제안한 각 단의 크로싱 지점을 판별하는 기법은 증폭기의 개수를 줄일 수 있도록 함으로서 저전력과 좁은 면적의 ADC 구현을 가능하게 하였다. 모의 실험 결과 500-MHz의 샘플링 속도와 1.8V 전원 전압에서 테스트에 필요한 디지털 회로까지 포함, 210mW의 전력을 소비함을 확인 할 수 있었다. 또한 1.2Vpp(Differential) 입력 범위와 200-MHz까지의 입력 주파수에서 8-비트에 가까운 ENOB를 가짐을 볼 수 있었다. 설계된 ADC는 $0.18{\mu}m$ 6-Metal 1-Poly CMOS 공정을 이용, $900{\mu}m{\times}500{\mu}m$의 면적을 차지한다.

• 한국공작기계학회논문집
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• 제18권1호
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• pp.116-121
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• 2009

Thermosonic flip chip bonding is an important technology for the electronic packaging due to its simplicity, cost effectiveness and clean and dry process. Mechanical properties of the horn and the shank, such as the natural frequency and the amplitude, have a great effect on the bonding capability of the transverse flip chip bonding system. In this research, two kinds of study are performed. The first is the new design of the clamp and the second is the effect of tolerance parameters to the performance of the system. The clamp with a bent shape is newly designed to hold the nodal point of the flip chip. The second is the effect of the design parameters on the vibration amplitude and planarity at the end of the shank. The variation of the tolerance parameters changes the amplitude and the frequency of the vibration of the shank. They, in turn, have an effect on the quantity of the plastic deformation of the gold ball bump, which determined the quality of the flip chip bonding. The tolerance parameters that give the great effect on the amplitude of the shank are determined using Taguchi's method. Error of set-up angle, the length and diameter of horn and error of the length of the shank are determined to be the parameters that have peat effect on the amplitude of the system.

• KIEAE Journal
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• 제10권1호
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• pp.3-10
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• 2010

Riverside forests make a river bank stable because trees of them hold together the stone and soil by roots and decrease the speed of running fluid by trunks. So they become known to have positive effects on flood prevention. So This study will be a basic study to preserve and restore of riverside forests. The goal of this study is to classify types of Han riverside forests between Yangpyeng and Yeoju gun. and find out sites of planting. Results of this study can be summarized as follows; The evaluation indicators were set up based on literature review and site survey. Two indicator categories were developed: natural environment and human environment. And they were divided into 5 sub-categories for calculating weights. As for the major indicator categories, the weighted index of natural environment is at 0.5. And the weighted index of human environment is at 0.5 followed by access at 0.15, the range of user at 0.15, cultivated land at 0.1 and legislation at 0.1. This study selected 53 sites for riverside forests planting. They were classified with types of bank(11), level-upped riverside(32), island(10). The amount of the length of 11 bank types is 23,050m, the area of 32 level-upped riverside types is $4,490,000m^2$ and the area of 10 island types is $4,590,000m^2$. After the evaluation of 53 riverside forests, this study selected 12 sites of riverside forests. They were two bank types, nine level-upped riverside types, and one island type. Rebuilding riverside forests are to accomplish the green network which links and divides region. It will be one of the best ecological methods to construct friendly environmental region.

• 한국초등과학교육학회지:초등과학교육
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• 제24권4호
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• pp.351-359
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• 2005

The aims of this research are to analyze elementary preservice teacher's conception and causes of their misconceptions on biological reproduction and inheritance. In future, it would be also to provide useful data for the effective teaching-teaming method in the elementary school as well as opportunities to correct their misconceptions, which help elementary preservice teachers have the appropriate scientific conceptions. Thirty kinds of test questions were designed in science curriculum for elementary students and biology textbook for university students in order to develop reproduction and inheritance's concepts. The questionnaire was given to 166 junior students of university of education in a local city. All statistical analysis was performed using SPSS version 10.0 program. The major results are as follows: Among 30 test questions, 2 questions in plants, 5 questions in animals and 2 questions in gene were appeared as misconceptions over $50\%$. The major reason to hold the misconceptions was influenced by 'learning up to now' category. The selection reasons of response were significantly different between scientific conceptions and misconceptions in 10 questions by analysis of variance. The gender also showed statistically significant differences between scientific conception and misconception in 3 questions by $\chi^2$ test. The selection reasons according to gender were significantly different between male and female students in 5 questions. For the reasons in forming misconceptions, they may cause by stereotype, conscious priority, differences of experiences, interest or attention, lack of professional Knowledge, and so on. Therefore, it was concluded that this research may help elementary preservice teachers to reconsider their conception for reproduction and inheritance and to be successful in science instructions fur elementary students.

• 한국ITS학회 논문지
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• 제13권4호
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• pp.30-37
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• 2014

단차로 하이패스시스템의 지 정체로 인한 교통 혼잡, 안전사고, 유지보수 등 매년 발생하는 문제를 해결하기 위해 무정차 다차로 고속주행기반 시스템의 개발이 필요하게 되었다. 하이패스 통신시스템은 단차로 환경에서 선입선출 방식이므로, 다차로 환경에서 발생하는 군집주행 및 차로전환 등 다양한 주행패턴을 처리할 수 없다. 본 논문에서는, 기존의 하이패스 단말기를 수용하면서 다차로 주행이 가능한 통신시스템을 개발했다. 능동형 RF/IR 통신 안테나를 이용해 중첩 영역은 넓히고, 오류범위를 최소화 하는 기술을 구현했다. 체험도로를 다차로 실 환경처럼 구축하여 테스트한 결과 하이패스시험기준을 통과했을 뿐 아니라, 속도별, 차로별, 차로전환별 주행시험 및 단말기 위치별 시험 결과 통신 정확도도 99.9%로 하이패스시스템의 성능을 만족했다. 무정차 다차로를 위한 통신시스템은 향후 고속도로 및 유료도로에서도 사용할 수 있을 뿐 아니라, 주차장에서도 활용할 수 있을 것으로 기대한다.