• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1993.04a
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• pp.35-39
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• 1993

항공기의 플러터 현상을 예방키 위한 개발시의 주요 공학적 임무로는 플러 터 해석, 풍동 플러터 시험, 실기체에 대한 지상진동시험 및 비행 플러터 시 험이 있다. 이들 업무는 군용 항공기의 경우에는 군사 규격서, 민간 항공기 의 경우는 FAR 규정 등에 항공기 개발 및 개조시에는 필히 수행토록 명시 되어 있으며, 특히 개발항공기의 인증을 받기 위해서는 초도 비행전까지 필 수적으로 완료되어야 하는 업무이다. 이중 항공기 지상진동시험은 개발항공 기의 초도 비행전에 실기체를 대상으로 하는 구조 동특성 규명시험으로써 플러터 해석 모델의 정확도를 입증하고 그 해석모델을 수정하거나 개선시키 는데 필요한 구조의 동특성 변수들을 실험적으로 규명하는 시험이다. 이 시 험은 개발된 항공기의 초도비행허가를 획득하고 비행속도제한을 설정키 위 해서 초도비행 직전에 초도 개발 비행기를 대상으로 필수적으로 수행되어야 하는 필수적 시험이다. 이에 따라 개발된 항공기의 전기체 지상진동시험을 수행하였고, 시험데이터의 모달해석을 하였다. 이 시험을 수행하기 위해 3개 의 가진기를 사용하였고, 모두 159개의 지점에서 주파수응답 함수를 얻었다. 최대 48 채널의 데이터 획득시스템을 사용하였으므로, 네번에 걸쳐 측정위치 를 옮겨 전체데이타를 획득하였다. 지상진동 시험의 최종해석 결과는 유한요 소 모델의 유효성을 검토하는데 사용되었고, 시험 데이타를 이용한 가진응답 해석(Forced Response Analysis)을 통하여 비행플러터 시험시에 사용되는 플러터 가진기의 위치선정 및 가진력의 크기를 결정하는데 이용하였다.ncy)가 저주 파수대로 천이(Lower Shift)하는 현상이 나타났으며, 일정한 작업량이라도 작업중량을 줄이고 작업 빈도를 높여서 작업할 경우에 이러한 현상이 더욱 두드러졌다. 작업시간의 경과에 따른 MVIS의 감소 현상은 작업빈도가 높고 비대칭형 작업일 때 가장 크게 나타났다. 총손실을 줄이고, 상대적 비용절감효과를 갖게할 수 있다고 하였다. 따라서 본 연구에서는 성인 여성기성복의 치수적합성을 높이기위하여 출산 후 중년에 접어 들면서 체형이 변화되는 것을 고려하여 연령을 분류하고(18세-34세, 30세-51세), 각 연령 집단에 따른 체형을 각각 3가지로 분류하였다. 이에 따라 의복 생산시의 총손실을 줄이기위한 상의, 하의생산시 필요한 부위별 최적규격치 간격을 제시하였다.적인 기능으로 보여지는 것에 좁혀서 작업능력의 연령증가 변화에 대하여다원적 평가를 하는 것이 실제적이라고 할 수 있다. 따라서 본 연구에서는 인간이 가지고 있는 다수의 기능중에서 수지교 치성과 연령증가와의 관계를 조사한다. 만약 연령증가 만으로 수지교치성을 평가 할 수 없는 경우에는 어떠한 요인이 수지기민성의 변화에 영향을 미치는가를 검토한다.t list)에서 자동적으로 사건들의 순서가 결정되도록 확장하였으며, 설비 제어방식에 있어서도 FIFO, LIFO, 우선 순위 방식등을 선택할 수 있도록 확장하였다. SIMPLE는 자료구조 및 프로그램이 공개되어 있으므로 프로그래머가 원하는 기능을 쉽게 추가할 수 있는 장점도 있다. 아울러 SMPLE에서 새로이 추가된 자료구조와 함수 및 설비제어 방식등을 활용하여 실제 중형급 시스

• Journal of the Korean Society of Earth Science Education
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• v.13 no.1
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• pp.90-99
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• 2020

The purpose of this study is to investigate the difference in science class ability, science pedagogy achievement and class evaluation factors according to elementary pre-service teacher's gender. Also, the correlation between science pedagogy achievement and science instructional ability was examined. Finally, the evaluation factors applied to the evaluation of science instruction according to male and female gender of elementary pre-service teachers were examined. This study was conducted from september 2019 to december 2019 for 88 elementary pre-service teachers attending P University of Education in Pusan metropolitan city. Among these 88 students, 32 elementary pre-service students were male, 56 were female. The conclusions of this study are as follows. First, as a result of analyzing the science instructional ability according to genders of elementary pre-service teachers, female elementary pre-service teachers showed statistically significant higher scores in science class ability compared to male elementary pre-service teachers. Second, as a result of analyzing the achievement of elementary science pedagogy according to gender of elementary pre-service teachers, female showed statistically significant higher scores for elementary science pedagogy than that of male. Third, as a result of analyzing the correlation between science instructional ability and elementary science pedagogy achievement, there was no statistically significant difference. This result can be applied both side of male and female. Fourth, both male and female pre-service teachers had various instructional evaluation factors, among which the linguistic factors of the instruction were used most frequently as criteria for instructional evaluation.

• Journal of the Korea Convergence Society
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• v.8 no.9
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• pp.271-276
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• 2017

This project has been conducted to improve the usability of Chatbot Services such as Google(Allo) and Facebook M(Messenger. Based on the evaluation, this study aims to suggest the solutions to improve the usability of domestic Chatbot services and future directions for their development. It provides the overall understanding of the AI Chatbot service and the feature of Chatbot service through literature search. Furthermore, we summarized the current standing and the prospect of domestic messenger-based assistant Chatbot services. For conducting user evaluation, Peter Morville's honeycomb model is applied to in-depth user interviews. The followings are elements that could be amended to improve the service. The service should be incorporated by intuitive elements for users' understanding its functions and eliminate any elements that interfere with usability. The accuracy should be increased to improve the user satisfaction. This research will provide the future guidelines to improve the usability of Chabot services through continuous evaluation by users.

• Journal of the Korean Institute of Gas
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• v.2 no.1
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• pp.74-82
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• 1998

The grain boundary etching method as a technique for assessing degradation of structural materials used at elevated temperature has received much attention since it is simple, inexpensive and easy to apply to real plant components. In this study, the technique is applied to some aged petroleum and chemical plant components such as reactors and drums. As a degradation parameter, intersection number ratio ($N_i/N_o$), is employed. The intersection number ratio ($N_i/N_o$) is defined as the ratio of intersection number ($N_i$) obtained from 5-minute picric acid etched surface to the number ($N_o$) obtained from Nital etched surface. In order to study degradation level, several relationships were measured such as the correlation between shift in ductile brittle transition temperature, $({\Delta}DBTT)_{sp}$ and intersection number ratio, ($N_i/N_o$) and the correlation between the measured ($N_i/N_o$) values and Larson-Miller Parameter values.

• Journal of the Korean Society of Propulsion Engineers
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• v.23 no.3
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• pp.51-57
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• 2019

Post curing effects are estimated by specimen tests. Propellant specimen accelerated aging tests are performed when post curing is estimated to be complete and the coefficients of Arrhenius aging equations are acquired. Simulated motors with cylindrical grain are designed and fabricated to confirm the application. Accelerated aging tests are conducted, and aged properties are measured and estimated for the inner bore, center and bond parts of the grain. The measured aging ratios of the modulus are compared with the ones predicted by the equations. As the results, the accelerated aging equations predict well the propellant aging trends; however, some differences are observed at the bond part. Therefore, the specimen extraction part must be carefully chosen to suit the test purpose when a rocket motor grain is used for the aging test.

• Journal of the Korean Chemical Society
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• v.44 no.3
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• pp.258-265
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• 2000

This study was designed to evaluate the effectiveness of an in-service training programusing computer interface and probes for science odified by 9 science teachers Then,27 science teachers participated in the 5 days of in-service training, which ran for three hours a day. The questionnaire for investigating the effectiveness of the program after the training showed that many teachers (1 ) voluntarily participated in this program with internal motivation,(2) were satished with the level of program difficulty, professionalism of lecturer, and classroom environment,(3) gave positive responses about the achievement of the purposes of this program,(4) showed strong intention for applying this program to their school teaching.

• The Journal of the Korea Contents Association
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• v.10 no.10
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• pp.190-196
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• 2010

Digital media has evolved in different areas as a result of the development of media and communications technology. The development of such media has also affected design in general as well as the design process systems focused on computer systems. Specifically, study of digital media design is based on a variety media and the development of computers due to social and environmental changes. Additionally, study is required on the convergence of variety of research including business, computer science, and human ergonomics. Nevertheless, most curricula in domestic universities are biased towards training practical manpower rather than creative/analytical manpower. For this reason, interchange between and study in multidisciplinary courses is desirable. Therefore, this study analyzes the curricula of departments of multimedia design of major universities and suggests enhanced curricula based on an analysis of the current state and understanding of the problem.

• Journal of Korean Medical classics
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• v.19 no.4
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• pp.212-218
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• 2006

당금시대(當今時代), 정진입도동서방문명형성상호간적융합공제(正進入到東西方文明形成相互間的融合共濟), 병탐색착이상생적관계진행발전적전절기(幷探索着以相生的關係進行發展的轉折期). 동양사상통과관찰정체적직관여통합적사유방법(東洋思想通過觀擦整體的直觀與統合的思維方法), 설명료우주변화규율화인간적각종난해지미(設明了宇宙變化規律和人間的各種難解之謎), 종이창조출료위대적음양오행론사상(從而創造出了偉大的陰陽五行論思想). 단시수착 '서세동점' 적조류(但是隨着 '西勢東漸' 的潮流), 신위동양인이교육화사유방법이축보서양화(身爲東洋人而敎育和思維方法已逐步西洋化), 미능계승아문적위대전통(未能繼承我們的偉大傳統), 반피서양적과학문명화물질문명소흡수(反被西洋的科學文明和物質文明所吸收). 연이(然而), 서양적임하일종철학급과학(西洋的任何一種哲學及科學), 몰유일개능구이일종원리래설명우주화인간급만물적변화(沒有一個能구以一種原理來說明宇宙和人間及萬物的變化), 즉몰유일개능여동양적음양오행론상필적적철학화이론(卽沒有一個能與東洋的陰陽五行論相匹敵的哲學和理論). 포괄음양오행론재내(包括陰陽五行論在內), 동양사상이기흔강적설복력, 수착과학진보(隨着科學進步), 기가치개시중신피인식(其價値開始重新被認識). 이전뇌화수자혁명위대표적현대문명(以電腦和數子革命爲代表的現代文明), 역시근거음양론적이진법위기초이창조출래적(亦是根據陰陽論的二進法爲基礎而創造出來的). 애인사탄(愛因사坦), 탕천수수(湯川秀樹), 니극발이(尼克勃이), 가포라등(기布羅等), 균대동양사상적위대성가이인가(均對東洋思想的偉大性加以認可), 병종차득도영감(幷從此得到靈感), 취득위대적과학성과(取得偉大的科學成果). 음양오행론시불가마살적절대진리(陰陽五行論是不可磨殺的絶對眞理). 불관대기이론가치급본질무지적인(不管對其理論價値及本質無知的人), 즘양급여평가, 단시저일이론시일개해석자연화인간본질급설명기변화적이론(但是這一理論是一個解釋自然和人間本質及說明其變化的理論), 결부회상실기진정적가치(決不會喪失其眞正的價値).

• Journal of Soil and Groundwater Environment
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• v.22 no.5
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• pp.98-104
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• 2017

Human Resources Development of Korea has been practicing performance evaluation for occupational qualification licences in environmental sectors that include water, air, and wastes management, but not soil. The purpose of the study was to improve overall quality of the national qualification test in the soil sector to better train applicants based on National Competency Standards (NCS), which is designed to emphasize site-specific conditions and knowledge. This study systematically analysed the current licence test in the soil sector with respect to qualification units, performance criteria, knowledge, techniques, and attitude as described in NCS. Furthermore, test evaluation was conducted to examine the validity of the revised licence test. The test results indicated the revised test method would bring positive outcomes to the related industry. Upon the reviews and amendments by the field experts, the result of this study could serve as a framework to the development of more robust and reliable licence test.

• Fire Science and Engineering
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• v.20 no.1 s.61
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• pp.15-22
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• 2006

This study intends to raise the fire safety awareness level which the teachers have in infant schools. The results of the study are as follows. The early childhood teachers consider the fire safety awareness level of our society low, though their fire safety awareness level be above the average. The education program for the fire safety is mapped out and the teachers prefer an observation class and a field trip for the program in almost infant schools. The early childhood teachers have difficulty acquiring the knowledge for the field experience and work and getting teaching aids for the fire safety. Therefore the early childhood teachers extremely much desire teaching aids for infants to be developed and diffused.