• 한국콘텐츠학회논문지
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• 제7권8호
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• pp.163-173
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• 2007

Need 나 want 시대를 지난 지금의 시대적 상황을 Feeling 시대라고 용어를 정리 하면서, 소비자 심리와 행동, 사회 문화적 변용을 근거로 한 의미 작용을 분석하였다. 이를 근거로 하여 $\sqrt{3}$비례를 기준으로 한 정삼각형의 기본조형을 얻어 유통, 판매, 할 수 있는 상품의 실질적 조형에 접근하였고, 상품 사용 후 여러 가지 형태로 다변화 할 수 있는 유희성과 재활용적 조형을 구축하였다. 이는 탈 코드화된 패키지조형의 창조라는 점에 큰 의미를 갖는다. 또 패키지 조형의 물리적, 기능적 가치뿐만 아니라 심리적 사회문화적 해석의 기능과 소비자의 정체성이 교감될 수 있도록 적절한 조형적 기호(semiotics)가 연구되어졌다.

• 대한조선학회논문집
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• 제36권3호
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• pp.71-82
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• 1999

비선형 동역학계의 불규칙한 운동은 그 계가 가지는 고유한 특성에 의해 생기는 현상으로써 때로는 예측할 수 없는 큰 운동이 발생한다. 해상 운행중인 선박의 경우 이러한 예측치 못한 큰 운동으로 인해 전복이 일어나기도 하므로, 비선형 선박 안전성 확보라는 관점에서 중요하게 다루어져야 한다. 본 연구에서는, 첫째로 임의의 구간 안에 있는 모든 초기 조건에 대해 선박 운동의 안정성을 파악하여 안정과 불안정으로 영역 구분을 시켜 주는 흡인 영역(basins of attraction)을 외력변화에 따라 그려 봄으로써 선박 운동에 대한 안정 영역의 정성적인 변화 과정을 파악하고자 하였다. 둘째로 전복이 일어나지 않는 안정 영역상을 초기 조건으로 한 선박 운동이 최종적으로 어떤 운동이 되는지 알아 보았다. 마지막으로 외력 변화에 따른 비선형 선박 운동 중 혼돈적 현상이 일어나는 운동에 대해서는 이를 상세히 분석하고자 과도상태가 지난 운동의 주기적 변화를 외력 변화에 따라 살펴보는 분기도(bifurcation diagram)를 이용하여 연구해 보았다.

• 한국재료학회지
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• 제16권5호
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• pp.323-328
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• 2006

In situ electrical conductivity measurements on $V_2O_5WO_3/TiO_2$ catalysts were carried out at between 100 and $300^{\circ}C$ under pure oxygen, NO and $NH_3$ to investigate the reaction mechanism for ammonia SCR (selective catalytic reduction) de NOX. The electrical conductivity of catalysts changed irregularly with supply of NO. It was, however, found that the electrical conductivity change with ammonia supply was regular and the increase of electrical conductivity was mainly caused by reduction of the labile surface oxygen. The electrical conductivity change of catalysts showed close relationship with the conversion rate of NOx. Variation of conversion rate in atmosphere without gaseous oxygen also showed that labile lattice oxygen is indispensable in the initial stage of the de NOx reaction. These results suggest that liable lattice oxygen acts decisive role in the de NOx mechanism. They also support that de NOx reaction occurs through the Eley?Rideal type mechanism. The amount of labile oxygen can be estimated from the measurement of electrical conductivity change for catalysts with ammonia supply. This suggests that measurement of the change can be used as a measure of the de NOx performance.

• 농업과학연구
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• 제46권4호
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• pp.941-953
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• 2019

Biodiesels are being explored as a clean energy alternative to regular diesel, which causes pollution. In this study, the optimum conditions for producing biodiesel (BD) by combining beef tallow, an animal waste resource with a high saturated fatty acid content, and corn oil, a vegetable oil with a high unsaturated fatty acid content, were investigated, and the fuel properties were analyzed. Furthermore, Multivariate Analysis of Variance (MANOVA) was used to verify the optimum conditions for producing biodiesel. The influences of control factors, such as the oil blend ratio and methanol to oil molar ratio, on the fatty acid methyl ester and biodiesel production yield were investigated. As a result, the optimum condition for producing blended biodiesel was verified to be tallow to corn oil blend ratio of 7 : 3 (TACO7) and a methanol to oil molar ratio of 14 : 1. Moreover, the interaction between the oil blend ratio and the methanol to oil molar ratio has the most crucial effects on the production of oil blended biodiesel. In conclusion, the analysis results of the fuel properties of TACO7 BD satisfied the BD quality standard, and thus, the viability of BD blended with waste tallow as fuel was verified.

• 한국정보통신학회논문지
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• 제6권8호
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• pp.1283-1291
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• 2002

본 논문에서는 DDFS로 구동하는 PLL을 Q-logic cell based library를 사용하여 schematic 상에서 설계하고 FPGA 0L32$\times$16B를 사용하여 구현하였으며, 측정 결과 주파수 합성기의 스위칭 속도는 DDFS에 사용되는 레지스터 단수와 같다는 결론을 얻을 수 있었다 시뮬레이션 결과 클럭지연은 11클럭 후에 발생되는 것을 알았고, 입력 상태가 랜덤하게 들어온다면 출력에 영향이 있음을 알았다. 따라서 입력상태가 일정간격을 가지게 함으로써 PLL을 구동하기 위한 DDFS는 잡음정형기를 사용하는 것이 좋으며, 또한 D/A 변환기의 대역이 매우 넓어야 하고, PLL의 스위칭 속도보다는 작은 입력 컨트롤 워드의 변화가 바람직하다는 것을 알 수 있다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.209-212
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• 2002

Since Berkhoff proposed the mild-slope equation in 1972, it has widely been used for calculation of shallow water wave transformation. Recently, it was extended to give an extended mild-slope equation, which includes the bottom slope squared term and bottom curvature term so as to be capable of modeling wave transformation on rapidly varying topography. These equations were derived by integrating the Laplace equation vertically. In the present study, we develop a finite element model to solve the Laplace equation directly while keeping the same computational efficiency as the mild-slope equation. This model assumes the vertical variation of wave potential as a cosine hyperbolic function as done in the derivation of the mild-slope equation, and the Galerkin method is used to discretize . The computational domain was discretized with proper finite elements, while the radiation condition at infinity was treated by introducing the concept of an infinite element. The upper boundary condition can be either free surface or a solid structure. The applicability of the developed model was verified through example analyses of two-dimensional wave reflection and transmission. .

• 한국의류학회지
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• 제29권1호
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• pp.91-102
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• 2005

The purpose of this study was to investigate the range of variation for commonly accepted ease in a business jacket and thus to find solutions to the problem of fit and ease in ready-to-wear jackets. This study was based on anthropometric measurements, pattern measurements, which were used to calculate ease amount according to each jacket part. The survey subjects were 493 males, between 25 to 59 years old, buying a jacket at stores in Seoul. In the results, the aesthetic purpose of a business jacket(custom-fit jacket) was clearly observed by the means of controlling the ease amount at chest, waist and hip. The ease at chest and waist(ready-to-wear) clearly revealed a difference among prototypes. This result can be explaned by the regular drops and the similar length-width proportions between sizes in ready-to-wear Jackets. Therefore, customers with varying body drop differences, who had to choose a homogeneous jacket drop, experienced too much ease at the Waist and Hip compared with custom-fit customers. In addition, the height could be an integral factor to affect the ease of jacket length and sleeve length. The ease at these parts was significantly different among height groups and showed negative relationships.

• 응용통계연구
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• 제24권4호
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• pp.575-586
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• 2011

본 연구는 보험산업에서 관심을 갖는 파산확률의 근사적 추이를 살펴보기 위하여 크레임의 분포가 정규변동성 성질을 갖는 사례를 통하여 파산가능성의 추이를 살펴보고, 정확한 파산확률 유도에 결정적인 역할을 하는 계수를 추정하는 실증연구에 초점을 둔다. 추정된 결정계수와 보험위험 확률모형의 안전지수와의 연관성을 분석하여 파산확률의 추이를 진단하는 방법도 함께 진행된다.

• 아동학회지
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• 제37권6호
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• pp.35-56
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• 2016

Objective: This study aimed to develop and validate the Childcare Adaptation Scale for Infants and Toddlers (CASIT), which is rated by teachers of Korean children. Methods: The participants consisted of 326 childcare teachers working with infants (ages 0-2 years). Content validity, discriminant validity, convergent validity, concurrent validity, internal consistency, inter-rater reliability, and item discrimination were examined using PASW 18.0 and AMOS 19.0. Results: The results of an exploratory factor analysis identified the 29-item scale and six dimensions of the scale, including group life adaptation, negative behaviors, positive affect, regular routines, activity/interest, and peer interaction. Convergent validity was examined via confirmatory factor analysis, average variation extracted (AVE), and construct reliability, and acceptable evidences of convergent validity was established. The scales were shown to be highly consistent internally and among raters. Also, the mean between the upper group and lower group of each item regarding item discrimination showed a significant difference. Conclusion: It was concluded that the CASIT, which is a quick and convenient tool for teachers to use, is a valid and reliable instrument.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2100-2101
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• 2008

This paper is studied on a protective control system for electrical fire and electrical faults due to over current or electric short circuit faults by using electrical thermal characteristics of PTC (Positive Temperature Coefficient) thermistor and current response characteristics of high sensitive reed switch. The PTC thermistor has characteristic of positive resistivity temperature coefficient according to the temperature variation, which is construction of a regular square and cube demarcation with BaTiO3_Ceramics of positive temperature coefficient. Also PTC thermistor shows the phenomenon which is rapidly increased in the resistivity if the temperature is increased over Curie temperature point, and reed switch, which is used for electrical fault current sensing devices, have a excellent characteristic of response velocity in degree of ${\mu}s{\sim}ms$ that sensing magnetic flux in proportion to dimension of line current. This paper is proposed on a protective control system use PTC thermistor and reed switch for sensor which is protected from electrical fire due to overload faults or electric short circuit faults. Some experimental results of the proposed electric safety control device are confirmed to the validity of the analytical results.