• KCI Concrete Journal
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• 제12권2호
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• pp.85-93
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• 2000

Potentially significant mechanical improvements in tension can be achieved by the incorporation of randomly distributed, short discrete fibers in concrete. The improvements due to the incorporation fibers significantly influence the composite stress - strain ($\sigma$-$\varepsilon$) characteristics. In general incorporating fibers in a plain concrete has relatively small effect on its precracking behavior. It, however, alters its post-cracking behavior quite significantly, resulting in greatly improved ductility, crack controls, and energy absorption capacity (or toughness). Therefore, a thorough understanding the complete tensile stress - strain ($\sigma$-$\varepsilon$) response of fiber reinforced concrete is necessary for proper analysis while using structural components made with fiber reinforced concrete. Direct tensile stress applied to a specimen is in principle the simplest configuration for determining the tensile response of concrete. However, problems associated with testing brittle materials in tension include (i) the problem related to gripping of the specimen and (ii) the problem of ensuring centric loading. Routinely, indirect tension tests for plain concrete, flexural and split-cylinder tests, have been used as simpler alternatives to direct uniaxial tension test. They are assumed to suitable for fiber reinforced concrete since typically such composites comprise 98% by volume of plain concrete. Clearly since the post-cracking characteristics are significantly influenced by the reinforcing parameters and interface characteristics, it would be fundamentally incorrect to use indirect tensile tests for determining the tensile properties of fiber reinforced concrete. The present investigation represents a systematic look at the failure and toughening mechanisms and macroscopic stress - strain ($\sigma$-$\varepsilon$) characteristics of fiber reinforced concrete in the uniaxial tension test. Results from an experimental parametric study involving used fiber quantity, type, and mechanical properties in the uniaxial tension test are presented and discussed.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제13권7호
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• pp.520-533
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• 2007

CRM(Customer Relationship Management)은 새로운 비즈니스 환경에서 기업의 이익과 경쟁적 우위를 차지할 수 있도록 하는 비즈니스 전략 모델이다. CRM 모델의 고객 응대 기법으로는 인터넷, E-mail, SMS(Short Message Service), 텔레포니 서비스, DM(Direct Mail)이 고객 접근 방법 매체로 이용된다. 최근 기업들의 수익성 모델 향상을 위한 노력으로 기존 고객의 이탈 방지 및 유지, 신규 고객의 가입 및 유지를 통한 비즈니스 모델을 다각화하고 있다. 본 논문은 CRM 채권 센터의 Avaya사의 예측발신시스템(Predictive Dialing System)을 기반으로 하였다. 예측발신시스템 구축 시 인입 콜(Call) 객체 처리를 위한 회선에 비해 대기 상담원이 적을 경우 실시간적 고객응대에 한계가 발생하였다. 기업의 입장에서 충분한 대기 상담원을 준비하지 못하는 이유는 고가의 유지비용 때문인데, 이를 해결하기 위해 본 논문에서는 불필요한 아웃바운드 상담을 줄이고, 과도한 콜백(CallBack) 적재를 감소시키기 위해서 고객 채널 통합을 위한 콜 객체 관리 메커니즘을 제안하고, 설계 구현 하였다. 성능 평가는 제안된 모델과 이전 모델의 실 데이타 값으로 평가 하였다. 제안된 모델은 대형 CRM 센터에서 효율적으로 이용될 것이다.

• 한국보육학회지
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• 제18권1호
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• pp.103-123
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• 2018

본 연구는 영아의 인지능력 및 의사소통능력에 영향을 미치는 영아기질, 영아-교사상호작용, 모의 양육스트레스 간의 구조적 관계를 밝히는데 그 목적이 있었다. 연구대상은 S시에 거주하는 만 2세 영아 249명으로 평균월령은 30.21개월이었다. 'K-ASQ', '영아의 기질 평정도구', '부모 스트레스 척도 축소판, '영아교사 상호작용 평가도구'를 사용하여 연구자료를 수집하였으며 수집된 자료는 Pearson 적률 상관계수와 구조방정식 모형 분석을 통해 검증하였다. 연구결과 첫째, 영아의 인지 및 의사소통능력과 사회성 기질, 영아-교사 상호작용간의 정적인 상관이 나타났으며, 영아의 인지 및 의사소통 능력과 정서성 기질, 모의 양육스트레스 간의 부적 상관이 나타났다. 둘째 영아의 인지 및 의사소통 능력에 발달을 미치는 관련변인들의 구조적 관계를 살펴본 결과, 사회성 기질은 모의 양육스트레스에 직접적으로 영향을 주지만 모의 양육스트레스를 매개하여 인지능력에 영향을 주기보다는 주로 직접적인 경로로 인지능력에 영향을 미치는 것으로 나타났다. 영아의 정서성 기질은 모의 양육스트레스를 매개하여 영아의 인지능력에 영향을 미치는 것으로 나타났다. 영아의 기질은 영아-교사의 상호작용에 영향을 주지 않았지만 영아-교사 상호작용은 영아의 인지능력에 직접적인 효과가 있는 것으로 나타났다. 마지막으로 영아의 의사소통 능력에 관한 경로는 유의미하지 않은 것으로 나타났다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.351-354
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• 1996

A zero-voltage-transition(ZVT) full bridge (FB) boost converter for single stage power factor correction (PFC) in distributed power system is proposed. A simple auxiliary circuit provides zero-voltage-switching(ZVS) condition to all semiconductor devices without imposing additional voltage and current stresses and loss of PWM capability. The proposed boost converter provides both input power factor correction and direct conversion from $110{\sim}220VAC$ line to 300VDC bus with single power stage. Operational principle, analysis of the proposed converter are described and verified by computer simulation and experimental results from a 1.5 kW, 80 kHz laboratory prototype.

• 한국제4기학회지
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• 제21권1호
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• pp.15-26
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• 2007

A wide tree-ring data network from Western Himalayan region as well as from Central and Peninsular India have been established by the Indian Institute of Tropical Meteorology (IITM), Pune, India. This includes several ring width and density chronologies of Himalayan conifers (Pinus, Picea, Cedrus, Abies)covering entire area of Western Himalaya and teak (Tectona grandis L.F.) from central and peninsular India. Many of these chronologies go back to $15^{th}$ century. Tree-ring based reconstructed pre-monsoon (March-April-May) summer climate of Western Himalaya do not show any significant increasing or decreasing trend since past several centuries. High altitude tree-ring chronologies near tree line-glacier boundary are sensitive to the winter temperature. Unprecedented higher growth in recent decades is closely associated with the warming trend over the Himalayan region. Dendroclimatic analysis of teak (Tectona grandis) from Central and Peninsular India show significant relationship with pre-monsoon and monsoon climate. Moisture index over the region indicates strong association with tree-ring variations rather than the direct influence of rainfall. It is evident that, two to three consecutive good monsoon years are capable of maintaining normal or above normal tree growth, even though the following year is low precipitation year.

• 전자공학회논문지CI
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• 제37권1호
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• pp.21-31
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• 2000

본 논문에서는 이산 시간 신경망 제어 시스템의 안정도에 대한 해석을 하도록 한다. 우선 리아프노프의 직접법을 이용하여 신경망제어기를 포함하고 있는 시스템의 안정조건을 체계적으로 유도하고 이 유도된 안정조건을 반영하여 수정된 역전파 알고리즘을 제안한다. 이 수정된 역전파 알고리즘은 유도된 신경망 제어기 시스템의 안정조건을 반영한 학습 규칙이고 따라서 이를 이용하여 학습된 신경망 제어기의 경우 안정성을 보장하게 된다. 끝으로 컴퓨터 모의 실험에서는 제안한 신경망 제어 시스템의 안정조건과 이를 반영한 수정 역전파 알고리즘을 통하여 주어진 플랜트를 학습 제어하도록 한다.

• 한국지역사회생활과학회지
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• 제12권2호
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• pp.47-59
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• 2001

The purpose of this study was to examine the factors affecting financial satisfaction of rural housewives. Data for this study were collected from 202 households living in 8 provinces. The results were as follows; 1) The most frequent financial problems experienced from expenditures on clothes(82.1%), lack of expense for social intercourse (61.47), and difficulty in purchasing durable goods(60.1%) in the order. 2) 44.6% of the respondents said they were satisfied with their net worth, and 21.6% of them confessed they had difficulties in debt redemption while 52.5% of them said they felt pressure about monthly payments of installments, which reveals that farm households find it hard to pay back short-term debt. 3) The path analysis was adopted to see the causal relations among the variables influenced the financial satisfaction. The variables of experiences of economic problems, educational background(graduated from middle school), saving, income, and age appeared to be important in the order of effectiveness. Among them, the variables of saying and experiences of economic problems showed a direct effect, and those of age and saving displayed an indirect effect with the experiences of economic problems as the parameter. From this findings, it is suggested that rural extension workers and educators should emphasize the importance of the financial plan in their educational programs.

• 한국소음진동공학회논문집
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• 제15권12호
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• pp.1327-1331
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• 2005

This Paper addresses what amount of whole-body vibration is exposed to Korean pilots of UH60 helicopters during their mission flight. To measure the expose4 whole-body vibration, the 12-axis whole-body vibration measurement system was used. It enables the direct measurement of whole-body vibration exposed from the body contact area consisting of the feet, hip and back. The measured 12-axis vibration signals were used to evaluate the vibration comfort level experienced by the pilots of UH60 helicopters. The evaluated vibration comfort level is found to be closeto 0.74-0.79m/s, which is equivalent to the semantic scale of 'fairly uncomfortable'. To assess the health effects of whole-body vibration exposed to Korean pilots of UH60 helicopters during their mission flight, the rms-based and VDV(vibration dose value)-based evaluation schemes, recommended by ISO 2631-1:1977, were exploited in this work. The evaluated results indicate that Korean pilots cannot avoid the fatigue-decreased proficiency limit after two-hour continuous flight. The whole-body vibration level exposed from the UH60 helicopters during continuous 10-hours mission flight is found to reach to the vibration exposure limit.

• 한국의류학회지
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• 제27권6호
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• pp.624-634
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• 2003

The purpose of this study was to classify body types of elderly male aged between 60 and 80. 40 direct items and 22 indexes were measured. The result were as follows. First. through the factor analysis of indexes, 8 factors were extracted upon factor scores, 4 clusters represented characteristics of elderly male's body type. Type 1 indicates flat and bend-forward type. Type 2 indicates fat and bend-forward type. Type 3 indicates lean-back type and is a little bit fat and the waist is round. Type 4 indicates a straight type in which the chest and the hip are developed. Second, drop was needed to discriminate elderly male's body type. 3 types of drop were extracted. The body type with big drop is Y type in which the drop distance is between 14 and 22cm. The body type with standard drop is A type in which the drop distance is between 6 and 14cm. The body type with small drop is B type in which the drop distance is between -4 and 6cm. Third, when the types of appearance rate were combined, 7 body types of elderly male showed high appearance rate; A1, B1, A2, B2, A3, A4, B4. According to the above result, flat and bended-forward type with drop A was dominant body type of elderly male.

• 셀메드
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• 제9권4호
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• pp.5.1-5.9
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• 2019

The therapeutic use of the wormwood plant Artemisia absinthium L. dates back to at least Roman times. There are more than 200 plants in the genus Artemisia- including southern wormwood, petite wormwood and Grande wormwood and encompasses about 500 species. The best-known species of wormwood is Artemisia absinthium, native to temperate Eurasia and North Africa and is branded for its extreme bitterness. It is a magical greens booze used as carminative to support healthy appetite, balances healthy flora, cleanse the digestive tract of parasite and toxins. It possesses anti-inflammatory, immunomodulatory, hepatoprotective, anti-helminthic and anti-depressant activity. Thujone excites nervous system when taken in small amount. Due to contrary history of wormwood, its application in individuals should be preceded by a thorough and cautious risk-benefit analysis. In this appraisal an attempt is done to validate scientifically, mentioned therapeutic potential of Artemisia absinthium in classical Unani literature using PubMed, Science Direct researches.