지상 및 비행 시험을 통한 플랩의 힌지 모멘트 추정

고명균(Myung-Gyun Ko) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.6

본 논문에서는 항공기 플랩 운용조건에 따라 변하는 플랩의 힌지 모멘트를 추정하는 실제적인 방법을 소개하였다. 플랩의 설계를 위하여 구조 하중해석과 풍동시험으로 산출한힌지 모멘트를 실제 비행 힌지 모멘트와 비교할 수 있었으며, 플랩 구조의 정적 안전성을 확인할 수 있었다. 이를 위해서 두 개의 변형률게이지를 플랩 힌지에 장착하였으며, 항공기 하중 모니터링 탑재장비를 사용하였다. 지상 시험을 통해서 힌지의 변형률과 모멘트의 상관관계를 해석해와 유한요소해석으로 교정하였다. 비행 시험에서는 플랩 처짐 각도 및 속도와 함께 변형률 신호를 기록하였다. 최종적으로, 계측한 변형률을 해석해와 유한요소해석으로 교정함으로서 비행 힌지 모멘트를 추정할 수 있었다. In this paper, a practical method of estimating the flap hinge moments which change according to the aircraft flap operations was introduced. For the flap design, the hinge moment derived by structural load analysis and wind tunnel tests was able to be compared with the real flight hinge moment, and the static safety of the flap structure could be verified though this comparison. In order to perform the tests, two strain gauges were installed on the flap hinge and an onboard device for aircraft load monitoring was utilized. Through the ground test, the correlation between the strain and the moment of the flap hinge was calibrated with analytic and finite element analysis. During the flight test, strain signals together with the flap deflection angles and airspeed were recorded. Finally, the flight hinge moments could be predicted by the measured strain which was calibrated with the analytic and the finite element analysis.

한국어 읽기교육에 대한 연구

고명균 ( Ko¸ Myung Gyun ) 한국언어문화교육학회 2004 언어와 문화 Vol.1 No.1

There are four basics of communication-functions in languages: speaking, listening, reading, and writing. Among these, reading is the most important, because it helps us to acquire some necessary information and to accept fundamental ideas about the culture where the language is spoken. Reading is an action in which articles and readers meet. In the mental process of reading, the influence of articles as a stimulant and of readers as interpreters function together. Therefore, a learner who wants to know Korean language and its relevant information would naturally come into contact with printed matter, such as books and newspapers. So to speak, s/he obtains all of the information through reading comprehension. There are three kinds of reading procedures: bottom-up model, top-down model, and interactive model. The interactive model is a mixed up model of bottom-up and top-down models and is available for reading. It is a cognitive process with much flexibility. To teach reading skills to language learners, the following should be considered: - We should use the learner's schema and experiences. - We should support and develop various textbooks. - We should have flexibility with reading time. - We should make a learner recognize the meaning of words in order to increase which with s/he is not familiar with. - We should recommend that learners read a number of books for their level the in vocabulary. What can be an effective reading instruction in Korean language teaching? It's very difficult to answer exactly. However, there are some ideas. First of all, we have to make learners master the basic course (reading letters, words, sentences, etc.) step by step. After reading instruction, we should evaluate them with reasonable instruments,such as the KPT (Korean Proficiency Test). Finally, we should be deliberate and cautious in selecting textbooks for them (National Institute for International Education Development)

근대어(近代語) ‘먹다’와 ‘다’에 관(關)한 연구(硏究)

高明均 ( Ko Myung Gyun ) 한국언어문화교육학회 2013 언어와 문화 Vol.9 No.2

This study aims to research the modification of ‘먹다’ and ‘다’ in the modern language, and proceeds identify their synonymy through their syntactic-semantic relationship and translation of Sino-Korean words. For the syntactic-semantic relationship, the ‘NP1-이 NP2-를 먹다/ 다.’ sentences was the main focus of attention. The first, sentence addresses the basic meaning of the two words, and the second, the semantic extensions that function as polysemous expressions. Identification of the synonymic-relationship between the two words in the modern language was possible by first, by comparing and contrasting the Sino-Korean word and the native Korean word through translation, second by comparing the objects (target roles of NP2) in the predicates of ‘NP1-이 NP2-를 먹다/다’ sentences, finally through the certification of the opposite meaning. (Kansai Univ.)

‘왜어유해(倭語類解)’의 구결(口訣) 차자표기(借字表記)에 관한 연구(硏究)

고명균 ( Ko Myung-gyun ) 한국언어문화교육학회 2005 언어와 문화 Vol.1 No.2

This paper’s aim is to study ‘Gugeol’ of Oeeoryuhae, published in 18c. Oeeoryuhae was a kind of classification dictionary for Japanese language learners during the Chosun dynasty. This book was divided into 2 volumes and included topics such as : astronomy, geography, direction, personality, rice... etc. ‘Gugeol’ was printed at the end of the 2nd volume, and also a transcript system used in order to read and understand the Chinese sentences in ancient time. It’s way as it was Chinese letter, or abbreviated form. ‘Gugeol’ of Oeeoryuhae was the last section and focused on grammatical functions. The particles, specific particles, endings, and especially, verb-stem ‘爲-’ were very important roles ; 1) most of ‘爲-’ were ‘Gugeol’ transcription not meaning but readborrowing 2) ‘爲-’ was not changed except ‘乎代(호□)’ and ‘爲厓(□)’ 3) gerund ‘-ㄹ, -ㄴ’ were to be ‘乙’ and ‘隱’ respectively And then, ‘Gugeol’ of Haneochobo published by the Japanese Literature Academy of 京都大學 in 1970, was a good material to compare with Oeeoryuhae. (Kansai Univ.)

Assessment of agricultural traits and phenolic compound composition of induced onion (Allium cepa L.) germplasm.

Se-Jong Oh,Ho-Cheol Ko,Myung-Chul Lee,Jae-Gyun Gwag,Hae-Gon Chung,Jung-Ro Lee 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07

Onion(Allium cepa L.) is one of the most important crops to the fresh vegetable spices and the food processing industry in Korea. To evaluate genetic variation in onion, major agricultural characteristics and biochemical characteristics such as flowering day, harvest day, brix and so on. Phenolic compound compositions were analyzed for 44 accessions. Accessions in white color was about 92% which is the largest one followed by standard criteria. The sweetness of juice ranged from 6.1 to 19.3(in brix), and Brix range of 117 accessions was from 10.1 to 14.0. High performance liquid chromatography(HPLC) was used to identify the phenolic profile and quantify phenolic content in bulbs: quercetin, quercetin 7, 4’-diglucoside, quercetin 3-glucoside and quercetin 4’-glucoside were detected as major components. The total Quercetin and Quercetin glycoside content ranged between 123.59 and 1155.84 mg/100mg bulb freeze dried weight. The quercetin contents was up to 16.7mg/100g, and 7.41mg/100g in average. It is expected that the result of this study can be used for breeding more competitive species with respect to contents in functional chemicals.

N-Doped Graphene Nanoplatelets as Superior Metal-Free Counter Electrodes for Organic Dye-Sensitized Solar Cells

Ju, Myung Jong,Kim, Jae Cheon,Choi, Hyun-Jung,Choi, In Taek,Kim, Sang Gyun,Lim, Kimin,Ko, Jaejung,Lee, Jae-Joon,Jeon, In-Yup,Baek, Jong-Beom,Kim, Hwan Kyu American Chemical Society 2013 ACS NANO Vol.7 No.6

<P>Highly efficient counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) were developed using thin films of scalable and high-quality, nitrogen-doped graphene nanoplatelets (NGnP), which was synthesized by a simple two-step reaction sequence. The resultant NGnP was deposited on fluorine-doped SnO<SUB>2</SUB> (FTO)/glass substrates by using electrospray (e-spray) coating, and their electrocatalytic activities were systematically evaluated for Co(bpy)<SUB>3</SUB><SUP>3+/2+</SUP> redox couple in DSSCs with an organic sensitizer. The e-sprayed NGnP thin films exhibited outstanding performances as CEs for DSSCs. The optimized NGnP electrode showed better electrochemical stability under prolonged cycling potential, and its <I>R</I><SUB>ct</SUB> at the interface of the CE/electrolyte decreased down to 1.73 Ω cm<SUP>2</SUP>, a value much lower than that of the Pt electrode (3.15 Ω cm<SUP>2</SUP>). The DSSC with the optimized NGnP–CE had a higher fill factor (FF, 74.2%) and a cell efficiency (9.05%), whereas those of the DSSC using Pt–CE were only 70.6% and 8.43%, respectively. To the best of our knowledge, the extraordinarily better current–voltage characteristics of the DSSC–NGnP outperforming the DSSC–Pt for the Co(bpy)<SUB>3</SUB><SUP>3+/2+</SUP> redox couple (in paticular, FF and short circuit current, <I>J</I><SUB>sc</SUB>) is highlighted for the first time.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-6/nn4009774/production/images/medium/nn-2013-009774_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4009774'>ACS Electronic Supporting Info</A></P>

Response Surface Design for Optimizing Growth Conditions for Fresh Forage Growing System

Do-Gyun Kim,Myung-Jun Ko,Wang-Hee Lee 한국산업식품공학회 2017 학술대회 및 심포지엄 Vol.2017 No.04

Response surface methodology (RSM) is one of the statistical methods for optimizing dependent variable in response to independent variables, and has been used in various field of food engineering. The model coded by RSM has a canonical formulation of 2nd order polynomial with the normalized ranges of independent variables. To accurately accomplish the optimization using RSM an adequate experimental design, i.e., response surface design, is necessary. Response surface design is determined by type of design and number of independent variables. In this study, we are to develop a response surface design applicable for optimizing hulled barley (Hordeum vulgare) production under various conditions of temperature and humidity in forage growing system. As a result, 3 experimental designs were conceived for future RSM; central composite design (CCD), inscribed central composite design (ICCD) and equiradial design. Each design requires experimental trials of 13, 13, and 8, respectively. We will further select one of the designs for actual experiments for finding the optimal temperature and humidity necessary for maximizing fresh forage production in the system.

AFP mandrel development for composite aircraft fuselage skin

Kumar, Deepak,Ko, Myung-Gyun,Roy, Rene,Kweon, Jin-Hwe,Choi, Jin-Ho,Jeong, Soon-Kwan,Jeon, Jin-Woo,Han, Jun-Su The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1

Automatic fiber placement (AFP) has become a popular processing technique for composites in the aerospace industry, due to its ability to place prepregs or tapes precisely in the exact position when complex parts are being manufactured. This paper presents the design, analysis, and manufacture of an AFP mandrel for composite aircraft fuselage skin fabrication. According to the design requirements, an AFP mandrel was developed and a numerical study was performed through the finite element method. Linear static load analyses were performed considering the mandrel structure self-weight and a 2940 N load from the AFP machine head. Modal analysis was also performed to determine the mandrel's natural frequencies. These analyses confirmed that the proposed mandrel meets the design requirements. A prototype mandrel was then manufactured and used to fabricate a composite fuselage skin. Material load tests were conducted on the AFP fuselage skin curved laminates, equivalent flat AFP, and hand layup laminates. The flat AFP and hand layup laminates showed almost identical strength results in tension and compression. Compared to hand layup, the flat AFP laminate modulus was 5.2% higher in tension and 12.6% lower in compression. The AFP curved laminates had an ultimate compressive strength of 1.6% to 8.7% higher than flat laminates. The FEM simulation predicted strengths were 4% higher in tension and 11% higher in compression than the flat laminate test results.

소아 경골 원위 골간단과 골단을 침범한 브로디 농양

전재균(Je-Gyun Chon),고염규(Youm-Gyu Ko),선두훈(Doo-Hoon Sun),문명상(Myung-Sang Moon) 대한정형외과학회 2002 대한정형외과학회지 Vol.37 No.5

AFP mandrel development for composite aircraft fuselage skin

Deepak Kumar,Myung-Gyun Ko,Rene Roy,Jin-Hwe Kweon,Jin-Ho Choi,Soon-Kwan Jeong,Jin-Woo Jeon,Jun-Su Han 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1

Automatic fiber placement (AFP) has become a popular processing technique for composites in the aerospace industry, due to its ability to place prepregs or tapes precisely in the exact position when complex parts are being manufactured. This paper presents the design, analysis, and manufacture of an AFP mandrel for composite aircraft fuselage skin fabrication. According to the design requirements, an AFP mandrel was developed and a numerical study was performed through the finite element method. Linear static load analyses were performed considering the mandrel structure self-weight and a 2940 N load from the AFP machine head. Modal analysis was also performed to determine the mandrel’s natural frequencies. These analyses confirmed that the proposed mandrel meets the design requirements. A prototype mandrel was then manufactured and used to fabricate a composite fuselage skin. Material load tests were conducted on the AFP fuselage skin curved laminates, equivalent flat AFP, and hand layup laminates. The flat AFP and hand layup laminates showed almost identical strength results in tension and compression. Compared to hand layup, the flat AFP laminate modulus was 5.2% higher in tension and 12.6% lower in compression. The AFP curved laminates had an ultimate compressive strength of 1.6% to 8.7% higher than flat laminates. The FEM simulation predicted strengths were 4% higher in tension and 11% higher in compression than the flat laminate test results.