• 한국콘텐츠학회논문지
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• 제15권3호
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• pp.477-487
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• 2015

학교장에게 학교 운영의 권한이 대폭 위임된 제주형 자율학교 운영에 대한 관심이 높아지는 가운데, 학교운영의 효율성을 높이기 위한 노력이 진행되고 있다. 본 연구는 자료포락분석(DEA)을 활용하여 제주형 초등자율학교의 상대적 효율성을 분석하는 데 목적을 두고 수행되었다. 중요한 결론은 다음과 같다. 첫째, 제주형 자율학교의 상대적 효율성에 큰 차이가 있었으나, 이러한 효율성의 차이는 규모 요인보다는 운영상의 문제로 나타났다. 둘째, 제주형 자율학교의 상대적 비효율성을 개선하기 위해서는 학생 및 학부모의 만족도를 높여야 하며, 특히 학무모 변인의 특성을 분석하고 그들의 요구를 반영하여 교육 프로그램의 질적 수준을 향상시켜야 한다. 셋째, 제주형 자율학교 운영의 효율성을 높이기 위해서는 학교평가에 가용한 자원을 충분히 활용하였는가를 판단하는 효율성 관점을 도입할 필요가 있다.

• 정보교육학회논문지
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• 제19권1호
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• pp.21-30
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• 2015

21세기 지식 정보 사회에 컴퓨터 교육이 매우 중요하다. 컴퓨터 교육에서 컴퓨터 프로그래밍 교육이 매우 중요하다. 컴퓨터 프로그래밍 교육에는 교수 학습 모델이 거의 없다. 본 연구에서는 학생들이 자기조절 학습을 할 수 있는 자기 조절 학습 모형을 개발한다. 본 연구에서는 자기 조절 학습 요소, 자기 조절 학습 단계와 자기 조절 학습 모형을 제안한다. 자기조절 학습 요소는 과제 수준, 일반화, 효율화이다. 자기조절 학습 단계는 문제이해, 설계, 코딩, 시험, 유지보수이다. 자기조절 학습 모델은 복사하기, 변형하기, 창조하기, 도전하기이다. 본 연구의 결과는 다음과 같다. 학습 요소들과 성취도간의 상관관계 분석은 효율화와 일반화가 과제 수준보다 더 높았다. 학습 단계에는 문제 이해와 설계 단계가 다른 단계보다 더 높았다. 학습 모형에서는 변형하기, 창조하기, 도전하기가 구현하기보다 상관관계가 더 높았다.

• International Journal of Precision Engineering and Manufacturing-Green Technology
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• 제5권5호
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• pp.643-650
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• 2018

A self-powered electrochromic device was fabricated on an indium tin oxide-polyethylene naphthalate flexible substrate using a dye-sensitized solar cell (DSSC) as a self-harvesting source; the electrochromic device was naturally bleached and operated under outdoor light conditions. The color of the organic electrochromic polymer, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, was shifted from pale blue to deep blue with an antimony tin oxide film as a charge-balanced material. Electrochromic performance was enhanced by secondary doping using dimethyl sulfoxide. As a result, the device showed stable switching behavior with a high transmittance change difference of 40% at its specific wavelength of 630 nm for 6 hrs. To improve the efficiency of the solar cell, 1.0 wt.% of Ag NWs in the photoanode was applied to the $TiO_2$ photoanode. It resulted in an efficiency of 3.3%, leading to an operating voltage of 0.7 V under xenon lamp conditions. As a result, we built a standalone self-harvesting electrochromic system with the performance of transmittance switching of 29% at 630 nm, by connecting with two solar cells in a device. Thus, a self-harvesting and flexible device was fabricated to operate automatically under the irradiated/dark conditions.

• 한국치위생학회지
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• 제13권4호
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• pp.639-644
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• 2013

Objectives : The aim of this study is to investigate the influencing factors of oral health behaviors according to oral health education experiences in middle school students. Methods : The subjects were 301 middle school students who lived in Gimhae and Jinhae. All statistical analyses were performed using SPSS. Results : The group with oral health education experience had higher scores in oral health knowledge(p<.01) than the group without oral health education. The group with oral health education experience has higher scores in oral health behavior (p<.01) than the group without oral health education. The group with oral health education experience has higher scores in self-efficiency (p<.01) than the group without oral health education. The experience of oral health education shows positive correlation with oral health knowledge(r=0.184), oral health behavior(r=0.199) and self-efficiency(r=0.199). There existed a positive correlation between oral health knowledge and self-efficiency(r=0.351). Conclusions : It is necessary to provide oral health promotion program in middle school students. The importance of oral health care is closely related to oral health knowledge.

• 대한간호학회지
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• 제39권2호
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• pp.177-185
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• 2009

Purpose: The purposes of this study were to examine the relationships among activities of daily living, self-efficiency, nursing home care quality and nursing home adaptation, and to identify the influencing factors of nursing home adaptation in nursing home residents. Methods: The study employed a descriptive correlational design. The data were collected from 148 older adults without dementia by interview from six nursing homes in three cities from February 1, 2008 to February 28, 2008. Results: Levels of nursing home adaptation in older adult residents were different by type of decision maker of nursing home admission, reason of nursing home admission, type of payment and length of nursing home stay. The nursing home adaptation was significantly correlated with self-efficiency and nursing home care quality. The strongest predictor of nursing home adaptation was type of decision maker of nursing home admission followed by the self-efficiency. Conclusion: The study suggested that during the decision making period of nursing home admission, older adults should have enough time and careful considerations of their families to decide by themselves in positive ways. Nursing home staff should be able to identify reasons of nursing home admission and demands or expectations of older adults and their families.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권7호
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• pp.3678-3698
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• 2017

With the rapid development of vehicular ad hoc Network (VANET), it has gained significant popularity and received increasing attentions from both academics and industry communities in aspects of security and efficiency. To address the security and efficiency issues, a self-authentication and deniable efficient group key agreement protocol is proposed in this paper. The scheme establishes a group between road side units (RSUs) and vehicles by using self-authentication without certification authority, and improves certification efficiency by using group key (GK) transmission method. At the same time, to avoid the attacker attacking the legal vehicle by RSUs, we adopt deniable group key agreement method to negotiation session key (sk) and use it to transmit GK between RSUs. In addition, vehicles not only broadcast messages to other vehicles, but also communicate with other members in the same group. Therefore, group communication is necessary in VANET. Finally, the performance analysis shows superiority of our scheme in security problems, meanwhile the verification delay, transmission overheard and message delay get significant improvement than other related schemes.

• 정보학연구
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• 제7권3호
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• pp.11-18
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• 2004

신경회로망의 학습은 신경사이의 연결강도 갱신과정으로 이루어진다. 이때, 학습계수를 잘못 설정하였을 경우, 과도한 학습 횟수를 요하거나, 올바른 학습을 수행하지 못하게 된다. 패턴분류에 자주 이용되는 코호넨 신경회로망의 경우 고정된 학습계수를 사용하여 연결강도를 일률적으로 갱신하는 방식을 취함으로서 학습효율을 저하시키는 문제점이 발생한다. 본 논문에서는 코호넨 신경회로망의 학습효율을 향상시키기 위하여 학습계수를 입력벡터와 연결강도 벡터의 차에 따라 가변적으로 적응하는 자율학습 알고리즘을 제안하였다. 제안된 학습 알고리즘의 검증을 위하여 온라인 필기체의 표준 획 분류에 적용하였다. 그 결과 약 1.44~3.65% 정도의 학습 효율이 향상됨을 고찰하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.411-414
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• 2005

Concrete structure is recognized as the universal structuring material for its outstanding formability, economic efficiency, and strength development. However, as the ageing of field workers and the deficiency of skilled workers due to evasions from 3D business have recently become the major issues of the industry in Korea and as the materials are becoming more diversified and complicated for today's concrete structures are becoming higher, larger, and specialized, the need for practicality of construction work based on new technology and new method has greatly increased. In other words, the overall condition of today's construction business requires researches and developments on the self-compacting concrete for higher construction efficiency and quality improvements and the high-strength lightweight concrete for concrete weight reduction and reduction of area. Therefore experimental tests were performed as such compressive strength, dry shrinkage and carbonation of self-compacting concrete.

• Elastomers and Composites
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• 제51권3호
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• pp.226-232
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• 2016

We studied the photocatalytic functionality such as deodorant, antibacterial, fine dust collection efficiency of polyester-based non-woven fabric filter treated with self-actuated photocatalyst. According to UV/visible result, the UV-visible peak of visible-light responsive photocatalyst was found to be red shift at 420 nm sensitive in the visible light region. The deodorizing performance was shown to be reduced more than 80% even without dark conditions. Fine dust particles collection efficiency was shown to be excellent at the size of not only $2.5{\mu}m{\sim}10.0{\mu}m$ but also less than $2.5{\mu}m$. Also antimicrobial and antifungus was shown to be reduced more than 99.9%.

• Journal of the Optical Society of Korea
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• 제16권3호
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• pp.292-298
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• 2012

The epitaxial layer structures for blue InGaN light emitting diodes have been optimized for high brightness applications with the output power levels exceeding 1000 $W/cm^2$ by using a self-consistent finite element method. The light-current-voltage relationship has been directly estimated from the multiband Hamiltonian for wurtzite crystals. To analyze the efficiency droop at high injection levels, the major nonradiative recombination processes and carrier spillover have also been taken into account. The wall-plug efficiency at high injection levels up to several thousand $A/cm^2$ has been successfully evaluated for various epilayer structures facilitating optimization of the epitaxial structures for desired output power levels.