• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.277-277
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• 2007

$(Bi,La)_4Ti_3O_{12}$ (BLT) 물질은 결정 방향에 따른 강한 이방성의 강유전 특성을 나타낸다. 따라서 BLT 박막을 이용하여 FeRAM 소자 등을 제작하기 위해서는 결정의 방향성을 세심하게 제어하는 것이 매우 중요하다. 현재까지 연구된 BLT 박막의 방향성 조절 결과를 보면, BLT 박막을 스핀 코팅 법 (spin coating method)으로 중착하고, 핵생성 열처리 단계를 조절하여 무작위 방향성 (random orientation)을 갖는 박막을 제조하는 방법이 일반적이었다. 그런데 이러한 스핀 코팅법에서의 핵생성 단계의 제어는 공정 조건 확보가 너무 어려운 단점이 있다. 이러한 어려움을 극복할 수 있는 대안은 스퍼터링 증착법 (sputtering deposition method), PLD법 (pulsed laser deposition method) 등과 같은 PVD (physical vapor deposition) 법의 증착방법을 적용하는 것이다. PVD 법으로 증착하는 경우에는 이미 박막 내에 무수한 결정핵이 존재하기 때문에 핵생성 단계가 필요 없게 된다. PVD 증착법의 적용을 위해서는 타겟 (target)의 제조 및 평가 실험이 선행되어야 한다. 그런데 벌크 BLT 재료의 소결공정 조건과 전기적 특성에 관한 연구 결과는 거의 발표 되지 않고 있다. 본 실험에서는 $Bi_2O_3$, $TiO_2$ and $La_2O_3$ 분말을 이용하여 최적의 조성을 구하기 위하여 Bi양을 변화시키며 타겟을 제조 하였다. 혼합된 분말을 하소 후 pallet 형태로 성형하여 소결을 실시하였다. 시편을 1mm 두께로 연마하고, 표면에 silver 전극을 인쇄하여 전기적 특성을 측정하였다. Bi양이 3.28몰 첨가된 조성에서 최대의 잔류분극 (2Pr) 값을 얻었고, 이때의 값은 약 $18{\mu}C/cm^2$ 정도였다. 최적화된 조성 ($Bi_{3.28}La_{0.75}Ti_3O_{12}$)으로 BLT 타겟을 제조하여 PLD법으로 박막을 제조하였다. 박막 제조 시 압력은 $1{\times}10^{-1}\;{\sim}\;1{\times}10^{-4}\;Torr$ 범위에서 변화시켰다. $1{\times}10^{-1}\;Torr$ 압력을 제외하고는 모든 압력에서 BLT 박막이 증착되었다. 중착된 박막을 $650\;{\sim}\;800^{\circ}C$에서 30분간 열처리를 실시하고 전기적 특성을 평가한 결과, $1{\times}10^{-2}\;Torr$에서 증착한 박막에서 양호한 P-V (polarization-voltage) 이력곡선을 얻을 수 있었고, 이때의 잔류분극 (2Pr) 값은 약 $6\;{\mu}C/cm^2$ 이었다. 주사전자현미경 (SEM)을 이용하여 BLT 박막 표면의 미세구조도 관찰하였는데, 스핀코팅 법으로 증착한 경우에 관찰되었던 조대화된 입자들은 관찰되지 않았고, 상당히 양호한 입자 크기 균일도를 나타내었다.

• Korean Security Journal
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• no.42
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• pp.277-308
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• 2015

Recently the Japanese hostage crisis with Syria, the stake of the pilots IS of the terror group's affiliates like Kim incident occurred while urinarado IS not an exception anymore in connection with terrorism will not be able to do. In addition, particularly against terrorist groups worldwide, IS being a hero has been marginalized and wants uncritical drugs aimed at teens, such as dialog or game IS through SNS joined nationals as well as other countries, while recommending domestic complaints until the people power or luck, put the older brother can sign up for any terror group IS the terrorist group's terrorist acts while making the environment a national mark by foreigners or immigrants can be caused by the situation. Therefore, in this study, this IS serious for the terrorist acts of the terrorist group, IS due to the expansion of the domestic terrorist group caused the terror raids of about the dangers of foreign countries to review the case, and the incident has sought ways to prevent and respond to the rapporteur. The result IS due to the expansion of the domestic terrorist group caused the terror raids of the dangers of sex exists and that causes a response to the implements are as follows. First of all, IS brokering for the site of the terrorist group's approach to counter-terrorism Act will be a, and the next, each agency and terror for the information exchange and cooperation and serves as a reexamination of terror occurred through the quick and appropriate measures should be the language. Finally, the duties related to terrorism for teens, especially education and strengthen the safety program development and against terrorism should be carried out.

• The Journal of Engineering Research
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• v.5 no.1
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• pp.17-35
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• 2004

Svg(Scalable Vector Graphics) is xml graphic standard recommended by E3C as a language based on xml to express two-dimension graphic. Svg can accommodate all Xml's patency and advantage of interoperability, and can used as various web applications being combined with other xml language. In addition, Svg can be applied to the fields of electronic commerce, geographical information, computer education and advertisement because it can produce high quality of dynamic from real-time data. SVG's application can be enhanced by linking with database. In this paper, we discuss how Svg can be utilized in theater reservation system, not just explaining svg's meaning or ability. Svg added graphic advantage in addition to xml's advantage. This means that svg retains not only graphic element but also xml's softness. It becomes easier to designate seats and add them. Current reservation system provided in general only information on time and price for a ticket, but the system using SVG in this paper provides additional information on position, price, cancellation and purchase availability of seat.

• Korean journal of food and cookery science
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• v.21 no.6 s.90
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• pp.829-837
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• 2005

본 연구는 중학교 급식의 품질 개선을 위한 기초 자료를 제공하고자 학교급식을 시행하고 있는 부산지역 중학교 중에서 8개 학교를 대상으로 학교급식 서비스 품질의 급식 성과와 잔식에 대해 조사하였으며 이에 대한 결과는 다음과 같다. 1. 중학교 급식서비스의 품질 특성의 급식성과에 대한 결과, 전체 평균은 2.93점이고 공지된 식단의 정확한 배식>음식의 영양>음식의 맛>식단의 다양한 순으로 급식성과가 높은 것으로 나타났으나, 건의사항의 반영, 불만처리의 신속함, 반납장소의 청결 항목은 급식성과가 2.50점 이하로 전체 평균에 훨씬 못 미치는 것으로 나타났다. 여학생들이 남학생들에 비해, 급식경험 기간이 낮은 학생들이 급식경험 기간이 높은 학생들에 비해 급식서비스 품질특성 다섯 영역 모두에서 유의적으로(< 0.01) 높은 점수를 나타냈다. 그리고 매일 아침식사를 하는 학생들이 결식을 하는 학생들에 비해 식단의 다양함, 배식시간의 정확성, 공지된 식단의 정확한 배식에서 유의적(p <0.01)으로 높은 점수가 나타났다. 2. 학생들의 급식되는 음식에 대한 섭취정도에 대한결과에서, 여학생들이 남학생들에 비해 김치(>0.01)와 국 및 찌개(<0.05)에서 유의적으로 낮은 섭취율을 보였다. 또한 매일 아침식사를 하는 학생들이 아침식사횟수가 적은 학생들 보다 모든 식단에서 유의적으로 섭취율이 높게 나타났다. 3. 급식된 음식을 남기는 이유에 대한 결과에서, 밥의 경우에는 양이 너무 많아서, 국 및 찌개와 반찬의 경우에는 음식 맛이 없어서, 김치의 경우에는 자주 배식되어서가 주된 이유로 나타났다. 4. 학생들이 개선되기를 바라는 항목은 위생적인 음식> 식기류의 청결> 반찬 맛 순으로 높은 개선 요구도를 나타내었다 아침식사 횟수가 주 2회 이하인 학생들이 다른 학생들에 비해 #반찬수의 증가(<0.01)#,#음식양의 증가(<0.05)#,#급식종사자의 친절함(<0.05)#과 #공지된 식단의 정확한 배식(<0.05)#에 대해 유의적으로 높은 급식개선 요구도를 나타냈다. 5. 급식경험 기간과 급식성과 점수간의 상관관계에서, 급식성과는 급식경험 기간과 음(-)의 상관관계를, 아침식사횟수와는 양(+)의 상관관계를 보였으며, 서비스 품질의 특성 영역은 각 영역들에 대한 급식성과 점수가 높을수록 다른 영역의 급식성과 점수가 높은 유의적인(p <0.01) 양(+)의 상관관계를 보였다. 이상의 결과를 살펴볼 때, 균형된 영양공급이 다른 어느 시기보다 더 중요한 우리의 청소년들의 학교급식에 대한 만족도를 높이기 위해서 다음과 같은 제언을 하고자 한다. 먼저, 학교급식에 대한 식단 작성 시 학생들이 학교에서 제공되기 원하는 식단에 대한 의견을 받고 그 의견에 대한 결과를 게시하여 학생들이 제공되기 원하는 식단을 급식 시 제공하여 학생들이 식단선택에 동참할 수 있는 기회를 주는 것이 바람직하겠다. 또한 영양사는 학급의 반대표와의 정기적인 모임을 가짐으로서 학생들의 불만사항 및 개선 요구사항에대해 서로 의견을 교환하여 설문지조사가 아닌 직접적인 대화를 하여 문제점을 파악하고자 하는 적극적인 자세가 필요하겠다. 특히 아침식사의 결식 빈도가 높았고 이는 급식성과에 부정적인 영향을 줄 뿐 아니라 학교에서 제공하는 음식의 섭취정도에도 영향을 주고 있으므로 학생들에게 학부모와 전담교사 및 학교영양사는 학생들에게 이상적인 아침식사에 대한 교육은 물론이고 아침식사를 실천할 수 있도록 다양한 방안에 대해 함께 연구해야 하겠다. 정부차원에서 학교급식에 아침식사 프로그램을 도입할 수 있는 방안을 연구하고, 아침을 결식하는 학생이 학교에서 수업시작 하기 전에 간단한 식사를 할 수 있는 정책 도입이 필요하다

• Journal of Gifted/Talented Education
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• v.10 no.2
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• pp.25-46
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• 2000

These purposes are to have a necessity to be educated for the linguistic gifted among many gifted in speedy changeable age, and to find out what differences are of properties between the linguistic gifted children and nongifted children through comparing/analysing to gifted children any nongifted children using performance evaluation on writer's ability. Therefore, it intends to use as a assisting material in order to develop ability and properties of the linguistic gifted children and nongifted children as well. The studying details are 1) to compare/analyze thinking ability between the linguistic gifted children and nongifted children 2) to find out differences of thinking ability for unrealistic reasoning between the linguistic gifted children and nongifted children. The studying subjects had been chosen 3 children as a first grade in 'C' Gifted Academy and 3 children as a first grade in an elementary school from June 3, 1999 to June 12, 1999. The studying instrument was an evaluation of linguistic properties certification(Project Spectrum : Krechevsky,'1994). It had got a frequency calculation, average and standard deviation through the material anylzing with the program SPSSWIN. The conclusions are as belows, First, as a result of performance evaluation on writer's ability to gifted children and nongifted children, the gifted children were outstandingly shown the linguistic ability getting much higher score than nongifted children in respect of vocabulary level, structure of writing, and consistency/logicality of theme. Second, it was shown the gifted children had diffusing thought than nongifted children through the esthetic question and impformation memories with listening to the realistic juvenil story and the unrealistic juvenile story.

• Journal of Gifted/Talented Education
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• v.26 no.3
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• pp.541-559
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• 2016

This study investigated a relationship among facilitating discourse, students' perceived challenge, and learning outcomes(persistent intention and learning achievement) in an online science gifted education program. Two hundreds and forty-two middle school students participated in the study. A survey questionnaire which was consisted of 6 items of facilitating discourse from teaching presence questionnaire(Shea, Swan, & Pickett, 2005) and 5 items of challenge from Student Perceptions of Classroom Quality(Gentry & Owen, 2004) was administered. First, the findings of this study showed that students' perceived facilitating discourse as a part of teaching presence was positively related to students' perceived challenge in an online course. Second, students' perceived facilitating discourse were positively related to persistent intention, but were negatively related to students' achievement. Third, students' perceived challenge was positively related to persistent intention and achievement. Finally, challenge mediated the relationship between students' perceived facilitating discourse and persistent intention, and the relationship between students' perceived facilitating discourse and students' achievement as well. This results suggested that online program should be designed to increase the levels of facilitating discourse.

• Journal of KIISE:Information Networking
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• v.36 no.5
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• pp.425-436
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• 2009

In recent years, the user demands have increased for multimedia service of high quality over the broadband convergence network. These rising demands for high quality multimedia service led the popularization of various user terminals and large scale display equipments, which needs a variety type of QoS (Quality of Service). In order to support demands for QoS, numerous research projects are in progress both from the perspective of network as well as end system; For example, at the network perspective, QoS guaranteeing by improving of internet performance such as Active Queue Management, while at the end system perspective, SVC (Scalable Video Coding) encoding scheme to guarantee media quality. However, existing AQM algorithms have problems which do not guarantee QoS, because they did not consider the essential characteristics of video encoding schemes. In this paper, it is proposed to solve this problem by deploying the TS- AQM (Temporal Scalability Active Queue Management) which employs the differentiated packet dropping for dependency of the temporal level among the frames, based on SVC encoding characteristics by exploiting the TID (Temporal ID) field of the SVC NAL unit header. The proposed TS-AQM guarantees multimedia service quality through video decoding reliability for SVC streaming service, by differentiated packet dropping when congestion exists.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.398-407
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• 2017

This study examined the relationship among smartphone addiction, life stress, and family communication in nursing students. A total of 172 subjects participated in this study and the data were collected using the structured questionnaires. The collected data were analyzed using an independent t-test, ANOVA, Pearson's correlation coefficient, and multiple linear regression using the SPSS WIN 19.0 program. Overall, the level of stress was high, time of family communication was short, and smartphone addiction rate was high in nursing students. The high risk group of smartphone addiction was 14.0%, potential risk group was 29.0%, and normal group was 57.0%. In the risk group, the life stress was higher (t=3.15, p=.002) and family communication was not better (t=-2.53, p=.012) than the normal group. Smartphone addiction correlated significantly with life stress (r=.27, p<.001) and family communication (r=-.26, p=.001). The factors affecting smartphone addiction were smartphone usage time, life stress, importance of smartphones in their lives, and family communication, and the explanatory power was 31.3%. Based on these results, it is necessary to develop personalized and collective customized intervention programs focused on smartphone using method, life stress management, and family communication for the prevention and management of smartphone addiction of nursing students.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.9
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• pp.415-423
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• 2001

Recently, there are many attempts to reproduce real world fine art pieces in digital forms. The digital representations are convenient to store and/or transmit. In contrast, mobiles, or moving sculptures, such as those designed by Alexander Calder cannot to reproduced realistically by usual reproduction techniques. Since mobiles are originally designed to generate motions in response to external forces applied to it, people could not fully enjoy them through photographs or static images. We present a virtual mobile system where use can easily control the mobile and can feel the impressions that the artist originally intended to provide. A real-world mobile is reconstructed in a three-dimensional physically-based model. and then virtual wind is generated to give motions to it. The motions of the mobile are generated by constraint dynamics and impulse dynamics techniques, which are modified to fully utilize the characteristics of the mobile, and finally give interactive displays on the PC platforms. The techniques presented can easily be extended to simulate other interactive dynamics systems.

• Journal of the Korean Institute of Gas
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• v.2 no.1
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• pp.7-13
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• 1998

In this study, for the safety performance of LNG storage tank, the fracture toughness in X-grooved weld HAZ(heat-affected zone) of $9\%$ Ni steel was evaluated qualitatively and quantitatively, and the relation with the change in microstructure was analyzed. The toughness assessment was peformed through the modified CTOD test proposed for thick weldment with X-groove. Additionally, microstructures of HAZ were evaluated by OM, SEM and XRD. From the results, HAZ toughness of SMA(shielded metal arc)-welded $9\%$ Ni steel decreased as the evaluated region approached the fusion line. The decrease in toughness was apparently caused by the increase in the fraction of coarse-grained zone within HAZ. On the other hand, toughness drop with decreasing test temperature in F.L.(fusion line) ${\~}$F.L.+3mm was larger than that in F.L.+5mm${\~}$F.L.+7mm region due to the fact that in the former regions, retained austenite had poor stability.