• 제목/요약/키워드: 이경재

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농업용구조물의 신뢰성해석에 이용되는 확률함수의 연산방법 개발 (Development of Calculation Technique for Probabilistic Functions Used in the Reliability Analysis of Agricultural Structures)

  • 곽영철;이경재
    • 한국농공학회지
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    • 제39권2호
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    • pp.95-102
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    • 1997
  • The technique of the calculation for probabilistic functions used in the reliability analysis of agricultural structures is proposed in this paper for adapting the standardization method using a numerical intergration. The proposed standardization method deals with the structures whose deviations of material properties and loads are large such that the deviation range from 20% to 70%. The results computed by the proposed method are compared with those obtained by the Monte Carlo Simulation. Deterministic values such as deflection, stress, obtained by conventional structural analysis can be directly changed to probabilistic distributions by the proposed method.

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전통 색상을 적용한 치과 실내디자인의 감성적 접근 (The Korean Traditional Color as Emotional Design Approach in Dental Clinic Interior Design)

  • 김선영;이경재
    • 한국실내디자인학회:학술대회논문집
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    • 한국실내디자인학회 2006년도 춘계학술발표대회 논문집
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    • pp.63-64
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    • 2006
  • The design concept of this dental clinic Interior design is emotional color expression for the medical facility. This dental clinic is showing off the new adoption of the Korean primary traditional color pallette for the medical interior design. The graphic wall of the corridor is strongly attracting the eyes of customers while wrapping the corridor wall and partition with rather unconventional primary colored graphic shaping a tooth. Also the vivid and the dynamic atmosphere are emphasized by using the red color in the treatment area and the powder room. For the space programing, I focused on the functionality of each space and the efficiency of the traffic line. Centering around the information desk, the principal traffic line Is divided Into the staffs' private movement and the public movement.

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탄화수소 연료 액적의 연소 특성에 관한 수치해석 (A Numerical Study of Combustion Characteristics of Hydrocarbon Fuel Droplet)

  • 이봉수;이경재;김종현;구자예
    • 대한기계학회논문집B
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    • 제27권11호
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    • pp.1595-1603
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    • 2003
  • Droplet combustion at high ambient pressures is studied numerically by formulating one dimensional combustion model in the mixture of n-heptane fuel and air. The ambient pressure is supercritical conditions. The modified Soave-Redlich-Kwong state equation is used in the evaluation of thermophysical properties to account for the real gas effect on fluid p-v-T properties in high pressure conditions. Non-ideal thermodynamic and transport property at near critical and supercritical conditions are also considered. Several parametric studies are performed by changing ambient pressure and initial droplet diameter. Droplet lifetime decreased with increasing pressure. Surface temperature increased with increasing pressure. Ignition time increased with increasing initial droplet diameter. Temporal or spatial distribution of mass fraction, mass diffusivity, Lewis number, thermal conductivity, and specific heat were presented.

Electrical Phase Transition of Poly (4,4'-Aminotriphenylene Hexafluoroisopropylidenediphthalimide) by Photogenerated Charged Carrier Injection

  • 임규욱;이경재;이문호;강태희;정석민;양미현
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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    • pp.266-266
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    • 2013
  • We show a set-up of poly (4,4'-aminotriphenylene hexafluoroisopropylidenediphthalimide) (6F-TPA PI)/Al sample in which holes are injected by photoelectron emission process instead of direct charge carrier injection via metal electrode. In this process, an irreversible electrical phase transition of 6F-TPA PI is found in contrast to the Al/6F-TPA PI/Al structure, leading to a write-once-readmany behavior. The photoelectron spectroscopy results measured before and after the switching process revealed that the irreversible electrical phase transition of 6F-TPA PI is attributed to the chemical modification of the carbonyl group in phthalimide moiety.

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麗川工業 地의 大氣汚染이 곰솔에 미치는 影響 (Effects of Air Pollution on Pinus thunbergii in Yocheon Industrial Comples)

  • 김태욱;이경재;김준선
    • 한국대기환경학회지
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    • 제1권1호
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    • pp.25-32
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    • 1985
  • To examine the effects of air pollution on Pinus thunbergii growing around Yocheon Industrial Complex, evaluation of visible injury based on Injury Index and chemical analysis of water-soluble sulfur and fluorine contents in needles were carried out on 30 sampling sites. Histological responses of needles were also investigated on the necrotic needle tissues. Not only Injury Index but water-soluble sulfur and fluorine contents were higher at all sites than those at control site, and showed significant correlationship among them. Especially, they were rather higher in the vicinity of air pollutants sources. Water-soluble sulfur contents were positively correlated with average atomospheric $SO_3$ concentrations. Microscopic examination of necrotic needle tissues showed that mesophyll cells were collapsed with hypertrophy and collapse of transfusion cells.

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부천시 산림지역 아까시나무림 식물군집구조를 고려한 식생 관리 모델 (Model of Plant Management on Consideration of Plants Community Structure in Robinia pseudo-acacia Forests, Bucheon City)

  • 이경재;한봉호
    • 한국조경학회지
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    • 제26권2호
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    • pp.28-37
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    • 1998
  • The purpose of this study was to develop a model of plant management based on Robinia pseudo-acacia forests structure in Bucheon city, Korea. For 38 plots were established in Robinia pseudo-acacia forest of Bucheon city. As a result, Robinia pseudo-acacia community was expected to the proceeded to Quercus spp. community. In addition, the diversity of Robinia pseudo-acacia-Quercus spp. community was analyzed higher than Robinia pseudo-acacia community. Based on the result of forest structure analysis, Quercus spp. community was selected as the goal stage of plant management for Bucheon forests and 22 species that were selected by the importance value analysis, classification and ordination analysis and the correlation analysis were chosen as the ecological approprite species. This study also suggested density control guide line for sucession promotion, which individuals numbers of Robinia pseudo-acacia might be reduced from 50 individuals to 23 individuals by selective cutting in order to keep 65% of total basal area.

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한국항공우주연구원의 스크램제트 엔진 연구 동향 (Scramjet Engine Researches of the Korea Aerospace Research Institute)

  • 이양지;강상훈;양인영;이경재;양수석;차봉준
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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    • pp.297-299
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    • 2012
  • Korea Aerospace Research Institute has been doing researches on the hypersonic propulsion system and hypersonic wind-tunnel since 2000 and started scramjet engine researches from 2005. Total 5 kinds of scramjet engine were designed and tested and two of them were hydrocarbon-fueled scramjet engine. For verifying the own characteristics of each components like the intake and combustor, several component tests were done at the KSPC of JAXA and KARI. In this paper, current scramjet engine research activities of KARI will be described.

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『상한론(傷寒論)』 변병진단체계(辨病診斷體系)에 근거하여 지실치자탕(枳實梔子湯)을 투여한 다한증 증례 1례 (A Case Report of Hyperhidrosis Treated by Jisilchija-tang based on Shanghanlun Provisions)

  • 노영범;이경재;이지환
    • 대한상한금궤의학회지
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    • 제8권1호
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    • pp.145-153
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    • 2016
  • Objectives : This case report presents the effect of Jisilchija-tang on hyperhidrosis. The patient was diagnosed with Eumyangyukchahoonobok-byung based on Shanghanlun provisions. Methods : According to Shanghanlun seven meridian patterns diagnostic system, we diagnosed the patient as Eumyangyukchahoonobok-byung and she has been suffering from hyperhidrosis. The patient was treated with Jisilchija-tang. and it was provided for 3 months. Results : After the treatment, the degree of hyperhidrosis reduced from 10 to 2 on VAS. Conclusions : This case study show an effectiveness of using Jisilchija-tang according to Diagnostic system based on Shanghanlun provisions on hyperhidrosis.

한전(韓電)EMS의 데이터베이스 및 정보교환체제(情報交換體制) (Database Structure and Information Exchange System of KEPCO's EMS SYSTEM)

  • 이경재;유승철;김영한;이효상
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1988년도 추계학술대회 논문집 학회본부
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    • pp.87-91
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    • 1988
  • For the electric power system operation, the information to monitor the operation status of power plants and transmission lines is very important factor in the view point of system security and economic operation. This paper presents the logical and physical structures of database used by KEPCO's EMS. The adopted DataBase Management System (DBMS) of a relational model type offers many advantages such as easy maintenance of database. In addition, this paper briefly introduces the data exchange system between application programs and database.

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$CaCo_3-CO_2-NH_3$계에서의 배연탈황 특성 (Characteristics of the Flue Gas Desulfurization in $CaCo_3-CO_2-NH_3$ System)

  • 모세영;이경재;장홍기;손종렬
    • 환경위생공학
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    • 제14권2호
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    • pp.84-89
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    • 1999
  • This experiment was performed to develop the new desulfurization process which can eliminate the possibility of generation of the secondary pollutants by regenerating the limestone from the sulfite/sulfate slurry generated from the wet lime/limestone flue gas desulfurization process by treating it with the ammonium hydroxide and carbon dioxide and using it again. In the experiments, regent grade calcium carbonate was dissolved to obtain the 200ml of sample slurry of the concentration of 2.0~0.4 weight percent. After three times of regeneration and desulfurization process, the coefficients of regeneration and desulfurization efficiencies are calculated/measured. The obtained results are that the coefficients of generation of the first. second, and third regenerated calcium carbonate were 90.88, 92.13, and 91.50%, respectively; and the desulfurization efficiencies of those are 93.4, 94.2 and 93.0%, respectively.

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