• 제목/요약/키워드: Simple characteristics

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천이영역을 갖는 원통형 격자필터 설계를 위한 간단한 해석적 방법 (A Simple Analytic Method for Design of Optical Circular Grating Filters with Phase-Shifting Region)

  • 호광춘
    • 한국광학회지
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    • 제17권3호
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    • pp.209-215
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    • 2006
  • 협대역 천이영역을 갖는 원통형 격자전송구조 (Circular Bragg Grating: CBG) 가 최근 DWDM을 위한 광통신용 대역통과 필터로 널리 사용되고 있다. 이 원통형 Bragg 격자 구조들의 광 필터특성을 분석하기 위하여 본 논문에서는 Floquet-Babinet의 원리에 의존하는 새로운 해석적인 모드 전송선로 이른 (Modal Transmission-Line Theory: MTLT)을 제시하였다. 수치해석 결과, 제안한 해석법은 CBG의 필터특성을 분석하기 위한 유용한 프로그래밍 알고리즘을 제공하고, 다층 원통형 주기 구조들의 그 전송특성을 분석하기 위하여 쉽게 발전시킬 수 있음을 보였다.

모임별 상차림에 대한 인식도 및 기호도 조사 (Evaluation of the Recognition and Taste of Table Settings According to an Objective Party)

  • 김수인;박연진
    • 한국식생활문화학회지
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    • 제24권1호
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    • pp.23-32
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    • 2009
  • This study was conducted to generate fundamental data required by food coordinators and food space creators for planning and directing table settings. The results of this study were then used to suggest an ideal model of table settings for Korean-style food equipped with simple, sophisticated, and practical characteristics. Specifically, this study evaluated the importance of hygiene (safety, cleanness, arrangement), decoration (dignity, form, stylishness, presentation of food on plates), naturalness (seasonal beauty, comfortableness, natural beauty), and modernity (modern style, chic style, urban style). These factors were evaluated according to the preference of the table setting and the characteristics of the meeting, which fit various meal cultures, times, places, and objectives. The results of this study indicate that people prefer hygiene and decoration for family meetings (bansang setting), hygiene and modernity for friendly meetings (simple buffet setting), hygiene and decoration for company meetings (simple buffet setting), and hygiene and decoration for academic meetings (tea party). Hygiene and decoration were highly evaluated in most cases, which indicates that individuals at meetings for special purposes give weight to the meeting's atmosphere, but also consider the hygiene and cleanliness of the food.

압축 착화 기관의 연소 변동 특성에 관한 연구

  • 이창식
    • 오토저널
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    • 제9권1호
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    • pp.69-76
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    • 1987
  • This paper deals with the theoretical prediction and cyclic variation of combustion characteristics in a four stroke, single0cylinder, diesel engine. Theoretical calculations employed a simple empirical model of analysis of energy equation for the thermodynamic system of engine cylinder. The cyclic variation of combustion characteristics is investigated, in term of frequency distribution and standard deviation of peak characteristics, as obtained by combustion analyzer system. The results of theoretical prediction are shown to be in close agreement with the experimental data. The effect of fuel injection timing, engine speed, cooling water temperature, and the compression ratio on the cyclic variations of combustion characteristics were discussed.

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A Review on AC Loss Characteristics of High $T_c$ Superconductors

  • Amemiya, N.;Jiang, Z.
    • 한국초전도ㆍ저온공학회논문지
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    • 제8권4호
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    • pp.1-7
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    • 2006
  • This paper reviews AC loss characteristics of high $T_c$ superconductors. The mechanisms of AC loss generation are explained briefly, and AC losses are classified by the magnetic field components which generate them. A couple of analytical formulae of AC losses, which are useful for simple and rough AC loss estimations, are presented. AC loss characteristics of single BSCCO multifilamentary conductors and single YBCO coated conductors are reviewed based on previous experimental and numerical studies. AC loss characteristics of those two types of practical high $T_c$ superconductors are compared with each other.

이집트 복식의 재해석을 통한 미적 특성에 따른 조형적 특성에 관한 연구 (The Aesthetic and Formative Characteristics of Egypt Retro Trends)

  • 김은실
    • 복식문화연구
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    • 제17권3호
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    • pp.383-395
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    • 2009
  • The purpose of this study was to provide a formative charateristics by analyzing aesthetic charateristics of Egypt costume expressed in contemporary fashion. The result of this study obtained through this process were as follows. Aesthetic characteristics were expressed as a primative-retro characteristics, and a erotic-retro characteristics and a decorative-retro characteristics. Based on these trends, this study analyzed formative charateristics in an aspect of form, color, material, and decoration. In the modern fashion, unlike the H-line silhouette given by a natural fit in the primitive retro, the erotic retro was characterized in the shape by a tight H-line silhouette. For the color, peach, yellow green, gold, light blue, red, and black were used as the main color. For the material, see-through, gauze, mesh, organdy, and tight vinyl were utilized to emphasize an erotic image and expose a body secretly. For the decoration, the characteristic of erotic retro using the simple or same colors frequently was the use of similar accessories colors matched with material colors. The decorative retro was characterized in the shape by a H-line silhouette connected as a part of clothing which applied passium and a greatly modified silhouette from an Egyptian simple style which was well-matched with splendid accessories. For the color, the broadest range of color changes was found from light pastel such as white, yellow, light pink, burnt orange, blue, purple, silver, gold, and red to strong vivid tones. For the material, modern materials such as organdy, tulle, leather, and furs were often used. For the decoration, passium, an eagle pattern, scarab earrings, a crown, a sneak-shaped coronet, and pictograph printed on the fabric were frequently used.

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무선 센서 네트워크의 데이터 전송 특성을 고려한 효율적인 플러딩 기법 (Efficient Flooding Mechanisms with Considering Data Transmission Characteristics of the Wireless Sensor Network)

  • 안상현;임유진;김만희
    • 정보처리학회논문지C
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    • 제16C권2호
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    • pp.209-216
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    • 2009
  • 무선 센서 네트워크에서는 질의 분배(dissemination)나 이벤트 광고를 위해 플러딩이 요구된다. Simple(또는 blind) 플러딩은 폭주(implosion) 문제와 겹침(overlap) 문제를 야기하며, 따라서 simple 플러딩은 센서 네트워크의 수명을 감소시킬 수 있다. 따라서 본 논문에서는 플러딩 오버헤드를 줄이기 위해 플러딩 오버레이 구조(Flooding Overlay Structure; FOS)를 제안한다. 두 종류의 FOS 기법인 중앙형 FOS(Centralized FOS; CFOS)와 분산형 FOS(Distributed FOS; DFOS)를 제안하며, CFOS에서는 싱크가 네트워크 토폴로지 정보를 수집해서 그 정보를 기반으로 포워딩 노드를 선택하는 반면, DFOS에서는 각 센서 노드가 자신의 로컬 정보를 기반으로 자신이 브로드캐스트 패킷의 포워딩에 참여할지 여부를 결정한다. 제안한 FOS 기법들의 성능 분석을 위해 NS-2 기반의 시뮬레이션을 수행했으며, FOS 기법들과 simple 플러딩 및 gossiping의 성능을 비교했다. 시뮬레이션 결과, 제안한 FOS 기법들이 네트워크 수명 측면에서 simple 플러딩보다, 데이터 전달율 측면에서 gossiping보다 우수함을 알 수 있었다.

싸이리스터제어 병렬보상기의 특성 연구 (A Study on the Characteristics of Thyristor Controlled Shunt Compensator)

  • 정교범
    • 전력전자학회논문지
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    • 제4권4호
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    • pp.368-376
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    • 1999
  • 본 논문은, 대표적인 FACTS기기중의 하나인 싸이리스터제어 병렬보상기의 특성 연구를 수행한다. 이를 위하여 푸리에 공간에서 전력조류 조건을 만족하는 싸이리스터 점호각을 수치해석적으로 구하고, 그 계산 결과를 이용하여 정상상태 및 고조파 특성을 해석하였다. 그리고, Poincare Mapping 이론을 이용한 스위칭 주파수영역에서 안정도 해석과 EMTP 시뮬레이션을 이용한 시평면상에서 해석결과의 검증 및 여러 운전점에서 과도응답특성의 비교연구를 수행하였다.

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스윙형 역지밸브 성능 평가 방법 (Performance Evaluation Method of a Swing Check Valve)

  • 김양석;이도환;김대웅;박성근;홍승열
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.881-886
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    • 2003
  • In spite of its simple design, structure and operating mechanism, swing check valves are one of the critical components which adversely affect the safety of the nuclear power plants if they fail to function properly. Therefore, it is important to evaluate the performance condition of the swing check valves in safety-related systems. The performance characteristics of swing check valves include opening characteristics, the minimum required flow velocity, the pressure drop at design flow, the disc stability, and the effect of the upstream disturbances. Among factors to identify the performance of a swing check valve, a method to evaluate the opening characteristics and the minimum required flow velocity, which guarantees to fully open the disc and hold the disc without motion, are presented to determine the operating region of the swing check valve, such as stable, tapping, or oscillation. Based on the determined operating region and opening characteristics, the simple methods of wear and fatigue analyses of the specific parts of the valve are also described.

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농촌공간에 적용된 벽돌포장 줄눈의 심리적 특성 분석 (Psychological Characteristic Analysis of Brick Pavement Patterns in Rural Area)

  • 김대현;신지훈
    • 농촌계획
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    • 제14권1호
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    • pp.1-7
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    • 2008
  • Recently, brick pavement were widely introduced on the pavement in rural area. A variety of vision effects can be created from patterns of brick pavement. However, in most of brick pavement works, human psychological characteristics were not concerned. The purpose of this research was to discover psychological effect on brick pavement pattern. The results of the research can be summarized as follows: 1)Psychological impression on brick pavement pattern is similar among man and woman groups. 2)Stack bond and running bond pattern have a simple, relaxed, organized, and comfortable psychological characteristics. Basket weave & stack bond pattern has a simple and organized psychological characteristic. Herringbone bond pattern has a complex, dislike and uncomfortable psychological characteristic. Pinwheel bond pattern has a highly complex psychological characteristic. Basket weave and Basket weave variation bond pattern have a common psychological characteristic. 3)Employment of brick pavement pattern on this research is not highly preferred, hence it is necessary to develop a brick pavement patterns that have human psychological characteristics be concerned.

년대 2000 이후 섬유디자인에 나타난 스트라이프 패턴 연구 (A Study of The Stripe Patterns on The Fabric Design Since 2000)

  • 한정임
    • 패션비즈니스
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    • 제15권2호
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    • pp.160-173
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    • 2011
  • Stripe has been one of the all-time favorite fabric patterns so far and the usages have been widely applied of nearly everything ranging from everyday dress to interior fabrics. As the times change, patterns of this simple geometrical design have gradually become varied. Many effects of stripe patterns have allowed the patterns to be used in fabrics for fashion design and the patterns are considered fit for expressing individual characteristics. By studying theoretical background on categories of stripe patterns and the characteristics as a design and by researching the trends and properties exhibited in the modern fabric design, this paper will seek the potential of stripe patterns for design of a modern sense and the directions to express the patterns as a value-added design. This research was conducted through literature, books published at home and abroad, research papers and photographs on stripe patterns. Domestic magazines, web research, and photographs published since 2000 were studied for an analysis of the trends and characteristics of stripe patterns displayed in the modern fabric design. As the results, this research will explain the tendencies of stripe patterns on the modern fabric designs divided into several ways: simple and restrained modernity, active and sporty property, mannishness putting practicality forward-emerging as the status of women rises, and femininity emphasizing elegant women. The characteristics of the Plastic are categorized simplicity, rhythmicality, and Mixing of patterns.