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An Alternative Program for the Teaching of Multiplication Concept Based on Times Idea (배 개념에 기초한 자연수 곱셈 개념의 지도 방안)

  • Kang, Heung-Kyu
    • School Mathematics
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    • v.11 no.1
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    • pp.17-37
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    • 2009
  • Concept and model of multiplication is not single. Concepts of multiplication can be classified into three cases: repeated addition, times idea, pairs set. Models of multiplication can be classified into four cases: measurement, rectangular pattern, combinatorial problem, number line. Among diverse cases of multiplication's concept and model, which case does elementary mathematics education lay stress on? This question is a controvertible didactical point. In this thesis, (1) mathematical and didactical analysis of multiplication's concept and model is performed, (2) a concrete program of teaching multiplication which is based on times idea is contrived, (3) With this new program, the teaching experiment is performed and its result is analyzed. Through this study, I obtained the following results and suggestions. First, the degree of testee's understanding of times idea is not high. Secondly, a sort of test problem which asks the testee to find times value is more easy than the one to find multiplicative resulting value. Thirdly, combinatorial problem can be handled as an application of multiplication. Fourthly, the degree of testee's understanding of repeated addition is high. In conclusion, I observe the fact that this new program which is based on times idea could be a alternative program of teaching multiplication which could complement the traditional method.

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A Study on the Common Features of Western Clothing Style and the Style of Korean clothing - Focusing on the Three Kingdom and Unified Shilla era - (우리 나라 복식(服飾)과 서역복식간(西域服飾間)의 공통성(共通性)에 관(關)한 연구(硏究) - 삼국시대(三國時代), 통일신라시대( 統一新羅時代)를 중심(中心)으로 -)

  • Jeun, Jee-Eun;Shim, Hwa-Jin
    • Journal of Fashion Business
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    • v.5 no.4
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    • pp.127-143
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    • 2001
  • This thesis looks into the characteristics and compares the clothing styles between the Three Kingdom to the Unified Shilla era. The purpose of this study is to see what common themes exists between the foundation of Korean clothing and how it has evolved and through see to what extent the Chinese influence has been to Korean clothing culture. Also by explaining the originality and creativity of Korean clothing, we will be able to make clear the status of Korean culture. These findings include the following; 1. The Korean strait line Gik-ryong Kyo-im can also be found at the Gochang region in the west. 2. The Ban-ryong-ui, worn by the aristocrats of the Three kingdom and Unified Shilla era, began to appear from the nobles from the Nam-Buk cho(South-north era). This combined with a Bokdu(headwear) became a part of casual dress wear. 3. Go(pants) became a traditional part of clothing for Unified Shilla and the west. 4. Ban-bi and Bae-dang, all forms of Bansu-ui ( short sleeve), came from Chinas Kucha and Hotan and came to Korea. 5. Chinas Pae-baek and Pae-za (Shawl) which is the same as Unified Shillas Peo was also to be found to have come from the west. 6. The way a different color line was added to clothing both can be found in Korean and western clothing. Similarities to material used are; First, expensive wool was used and mostly originated from the west. From far away Rome came the O-saek-gae (Five-color wool). Secondly, Kong-gak me (peacock feather) and Bi-chi mo were all originated from the west. Third, Sil-sil is stated in the Sam-kuk Sa-ki (Three Kingdom records) as being prohibited to be worn by Jin-gol women (Highest nobility during Shilla era) as headwear or comb (pin) or as a comb(pin) for yuk-doo poom ( 6th class nobility) women. Suggesting that it existed and other sources tell us that it came from Tashkent region of Russia and was a jewelry of some sort. From what we have seen above, we can see the similarities between Korean and western clothing cultures and that these interactions not only occurred with China but with many other nations. We can see that our ancestors were creative and original that when importing foreign cultures that they transformed them into a Korean style. That these foreign cultures were transformed into our own style is good evidence to these facts.

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Oak Forests of the Daegok-cheon Petroglyphs Area in Ulsan, South Korea (울산 대곡천 암각화 유적지 일대의 참나무림 다양성과 분포 특성)

  • Lee, Gyeong-Yeon;Kim, Jong-Won
    • Korean Journal of Ecology and Environment
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    • v.50 no.1
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    • pp.126-136
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    • 2017
  • We describe characteristics of diversity and distribution of oak forests on the Daegok-cheon gorge of the Southeastern Korean Peninsula, the oldest prehistoric site, in view of a sort of food resources of acorns. The $Z{\ddot{u}}rich$-Montpellier School's method was adopted for field investigation on the oak dominant stands. A total of 20 phytosociological $relev\acute{e}s$ composed of 193 taxa were analyzed by syntaxonomy and ecological flora. The Daegok-cheon's oak forests occupied 36.9% ($513,374m^2$) of the surveyed area, and its 99% ($507,677m^2$) was Quercus variabilis and Q. serrata stands. Oak forests of the Daegok-cheon gorge are a kind of regional vegetation type characterizing by the high relative net contribution degree (r-NCD) of Platycarya strobilacea and Sapium japonicum, which are an edaphic type of the xerophilous and thermophilic oak forests. The region of the Daegok-cheon petroglyphs is defined as an ecoregion with rich acorn supply and abundant water resources, and the warmer environment, which attracts prehistoric man.

Repeated Reading Experiences of Adults: Centered on Lifelong Education Center Students at Chonbuk National University (성인의 반복독서 경험에 관한 연구 - 전북대학교 평생교육원 학생들을 중심으로 -)

  • Lee, Seung-Chae
    • Journal of the Korean Society for Library and Information Science
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    • v.45 no.1
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    • pp.353-376
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    • 2011
  • The goal of this study is to examine what kind of repeated-reading habits adults have, what sort of books they read repeatedly, and what preferences they have depending on their age or gender. A questionnaire was distributed to the students at Lifelong Education Center of Chonbuk National University to survey their repeated reading experiences. The results of the statistical analysis are as follows: 1) Most adults have experienced repeated reading. 2) Women have more experience with repeated reading than men, and in terms of age, more people in their forties read the same books repeatedly. 3) Most repeated readers read their books twice: Women tend to read their books repeatedly more than men do. 4) More than half of the adults in the sample group have read their favorite books several times. 5) The importance of books in this study was judged on the basis of the number of repeated readers and the frequency of reading. The order of important books is as follows: The Little Prince, The Tale of Three Kingdoms, The Giving Tree, The Greek and Roman Mythology, Meu Pe de Larania Lima, No Possession, Hope for the Flowers, and Demian. 6) More than half of the male repeated readers read The Tale of Three Kingdoms while female repeated readers tend to read a wider variety of books. 7) Adults read the same books repeatedly to enjoy and learn something.

Repeated Reading Experience of University Students (대학생들의 반복독서 경험에 관한 연구)

  • Lee, Seung-Chae
    • Journal of the Korean Society for Library and Information Science
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    • v.41 no.2
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    • pp.161-180
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    • 2007
  • The goal of this study is to examine what sort of books people read repeatedly, what are the different preferences between men and women, how much the repeatedly-read books are related to the most memorable books and how the repeatedly-read books are connected to reading habits. A questionnaire was provided to college students and their repeated reading experiences were searched. The results of the statistical analysis are summarized : 1) Most college students have experienced repeated reading more than twice. 2) The number of college students who have experienced repeated reading twice is the highest and next, those who have read repeatedly 3 times. Also, the number of times of repeated reading tends to be similar between male and female students. 3) The books which many students read repeatedly more than twice are : a) Romance of 3 Kingdoms b) Little Prince c) Da Vinci Code d) Alchemist e) Chinese nine spine stickle back f) Meu Pe do Larania Lima g) Harry potter. 4) About half of the students have read the most memorable books many times. 5) The importance of books was evaluated on the basis of the number of repeated readers and the number of readings. The order of the important books is Three Romans of 3 kingdoms, Little Prince, Da Vinci Code, Meu Pe do Larania Lima, Tuesdays with Mollie, Harry Potter, and The Myth of Greece and Rome. 6) The preferred books by male college students are mostly the stories of fighters while female likes books that contain deep emotion and morality. More than half of the males' repeated reading was Romance of 3 Kingdoms while the preferred books of females are distributed widely.

A Study of the Personal Ornaments and Make-up of Maroccan (모로코인(人)의 장신구(裝身具)와 화장(化粧)에 관(關)한 연구(硏究))

  • Lee, Soon-Hong
    • Journal of Fashion Business
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    • v.5 no.2
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    • pp.15-34
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    • 2001
  • Ornaments are accessories for the decoration of the body or dress. They aren't unavoidably required one, but serve to make one's dress perfect as decorative industrial art objects. In Morocco, ornaments were initially used as a sign of social position or the class or an incantatory symbol. In effect, they were originally employed to adjust one's dress, not just for decoration, and they were of use for household economy. Gold, silver and handcraft available for exchange were a means of increasing one's property and an indication of social standing and wealth. In particular, the dress and jewelry of a bride was a measure of her family's wealth, regarded as a symbol of her chastity and value. The ornaments symbolically back up people's faith in supernatural power, and their real value is based on implicit form or way of decoration, not the external shape. Specifically, there is a tendency to use the form of animal as a protector, not one to frighten people. In the artistic tradition of Morocco, fish pattern stands for water and rain, and eagle and bird are considered to be related to fate. Scorpion and lizard are depicted as an inquirer of sun, and snake is a symbol of abundance and sexual instinct, being viewed to have an ability to cure disease. Turtle pattern is a symbol of saint because it protects one from the evil. The ornaments are made of gold, silver, amber, clam, garnet, glass, nielle, enamel, glaze, coral or tree, and symbolic patterns are used, including hand(a symbol of five numerals), turtle, lizard, scorpion, eye, triangle, bird and eggs. They are very big and diverse, being categorized into ornaments for the head or the chest, neckless, fibula, earring, bracelet and ring. For Moroccans, make-up is a sort of instinctive behavior to meet aesthetic and sexual desire. They also wear make-up for practical purpose of protection, intentionally inflict a wound on the skin for ceremonial or religious purpose, paint the skin with pigment, or have the part of the body tattooed for incantatory purpose. All this actions are regarded as make-up. The raw material of cosmetics is aker, a vegetable dye. They get the lips or cheeks turn red and paint eyebrows with yellow saffran powder to have a bad devil lose its strength. Tattooing is mainly done by women and viewed as a sign of their value or social organization they belong to. Sometimes that is used to represent a woman's being old enough to marry or getting married already or the frequency of marriage. Besides, tattoo is believed to prevent or remedy loose bowels or cough, depending on its location or pattern, and they often change tattoo according to the change of beauty art.

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The Visual Expression in a Store by the Characteristics of Facade (FACADE특성에 따른 매장의 시각적 표현에 관한 연구)

  • 송인호
    • Archives of design research
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    • v.11 no.1
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    • pp.11-20
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    • 1998
  • Display in commercial space is one of the most important fields in modem advanced industrial sectors as means of promoting the volume of sales. Additionally, consummers' preferences are more complicated and various than before because of improvement of quality of life. In order to satisfy the various comsumer's desire, the role of display must be an important factor in commercial space. On the other hand, the facade of commercial buildings in the concept of visual merchandising has important effect on the commercial space such as layout of a shop, setting up presentation space, and visual expression. The structure of the facade of the store provides not only an advertising function but also an important position to the composition of external space. Besides, enterance space is a part of a store, and it is closely related to outdoor space. Therefore, the relationship between a store and outdoor space should be carefully considered in terms of functional and expressional problems.This study introduces all sort of characteristics of the facade of enterance speac in the commercial buildings. It also investigates the relationship among the characteristics. Moreover, it analyzes the effect of facade style on shop environment such as zonning, inducement plan, and allocation plan. For the purpose of this study, 57 fashion stores, located in Myung-Dong(Seoul), are investigated. Based on the sample, this study analyzes the relationship between the facade style and visual presentation. Finally, it suggests the desirable direction of space composition based upon the concept of visual merchandising.

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RSM-based Practical Optimum Design of TMD for Control of Structural Response Considering Weighted Multiple Objectives (가중 다목적성을 고려한 구조물 응답 제어용 TMD의 RSM 기반 실용적 최적 설계)

  • Do, Jeongyun;Guk, Seongoh;Kim, Dookie
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.21 no.6
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    • pp.113-125
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    • 2017
  • In spite of bulk literature about the tuning of TMD, the effectiveness of TMD in reducing the seismic response of engineering structures is still in a row. This paper deals with the optimum tuning parameters of a passive TMD and simulated on MATLAB with a ten-story numerical shear building. A weighted multi-objective optimization method based on computer experiment consisting of coupled with central composite design(CCD) central composite design and response surface methodology(RSM) was applied to find out the optimum tuning parameters of TMD. After the optimization, the so-conceived TMD turns out to be optimal with respect to the specific seismic event, hence allowing for an optimum reduction in seismic response. The method was employed on above structure by assuming first the El Centro seismic input as a sort of benchmark excitation, and then additional recent strong-motion earthquakes. It is found that the RSM based weighted multi-objective optimized damper improves frequency responses and root mean square displacements of the structure without TMD by 31.6% and 82.3% under El Centro earthquake, respectively, and has an equal or higher performance than the conventionally designed dampers with respect to frequency responses and root mean square displacements and when applied to earthquakes.

Automatic Generation of Snort Content Rule for Network Traffic Analysis (네트워크 트래픽 분석을 위한 Snort Content 규칙 자동 생성)

  • Shim, Kyu-Seok;Yoon, Sung-Ho;Lee, Su-Kang;Kim, Sung-Min;Jung, Woo-Suk;Kim, Myung-Sup
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.4
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    • pp.666-677
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    • 2015
  • The importance of application traffic analysis for efficient network management has been emphasized continuously. Snort is a popular traffic analysis system which detects traffic matched to pre-defined signatures and perform various actions based on the rules. However, it is very difficult to get highly accurate signatures to meet various analysis purpose because it is very tedious and time-consuming work to search the entire traffic data manually or semi-automatically. In this paper, we propose a novel method to generate signatures in a fully automatic manner in the form of sort rule from raw packet data captured from network link or end-host. We use a sequence pattern algorithm to generate common substring satisfying the minimum support from traffic flow data. Also, we extract the location and header information of the signature which are the components of snort content rule. When we analyzed the proposed method to several application traffic data, the generated rule could detect more than 97 percentage of the traffic data.

Enhancement of Membrane Performance through Surface Hydrophilization of Hydrophobic Porous Flat-sheet Membranes (소수성 다공성 평막의 표면 친수화를 통한 막성능 향상)

  • Kim, Baek-Ahm;Lee, Hak-Min;Lee, Bo-Seong;Kim, Sung-Pyo;Cheong, Seong-Ihl;Rhim, Ji-Won
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.438-443
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    • 2011
  • In order to enhance water permeability through the improvement of fouling phenomena and wettability of hydrophobic porous membranes, various adsorption materials, i.e., poly(vinyl amine), poly (styrene sulfonic acid), poly(vinyl sulfonic acid), and poly(acrylamide-co-acrylic acid) were adsorbed onto the surface of polyethylene (PE) porous membrane. The concentration of adsorption solutions, adsorption time, the sort of salts and their ionic strength were varied, and the pure water permeability of their resulting adsorbed membranes was measured. In general, water permeability increased with an initial increase in the concentration of adsorption solution, adsorption time, and ionic strength and then decreased with a further increase. The pure water permeability of 375 $L/m^2h$(LMH), 35% enhancement, was obtained at a condition of poly(vinyl sulfonic acid) 1000 ppm, $Mg(NO_3)_2$ ionic strength(IS) 0.1, and adsorption time 150 sec, while the 50% (411 LMH) and 35% (374 LMH) enhancements were obtained at conditions of poly(styrene sulfonic acid) 1000 ppm, adsorption time 60 sec, and NaCl IS 0.1 and 0.2, respectively.