• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1996년도 가을 학술발표회 논문집
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• pp.239-246
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• 1996

Very stiff floor system in a residential-commercial building causes some problems in the numerical analysis procedure due to significant difference in stiffness with adjacent structural elements. Static analysis of structure with a stiff transfer-floor can be peformed approximately in two steps for upper and lower pons for the structure. However, it is impossible to perform dynamic analysis in two steps with separate models. An efficient method for dynamic analysis of a structure with a rigid floor system is proposed in this study. The matrix condensation technique is employed to reduce the degree of freedom for upper and lower parts of the structure and a beam elements with rigid bodies of both ends are introduce to model the rigid floor system. Efficiency end accuracy of the proposed method ore verified through analysis of several example structures.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.255-258
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• 2003

The purpose of this study is to understand characteristics of stream and spring water and subsurface geologic structure in Seogwipo area. This study area is surrounded by various smaller parasitic volcanic cinder cones, tuff cones, strangely shaped basalt and trachyte rocks, beautiful waterfalls. The geologic structure in study area is classified into the Upper layer(volcanic rocks), Middle layer(SGF), Lower layer(UF), and Basement layer. The groundwater in Seogwipo area is classified into the Upper layer groundwater, Middle layer groundwater, Lower layer groundwater and Basement layer groundwater on the basis of the hydrostratigraphy structure.

• 한국생활과학회지
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• 제12권4호
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• pp.559-570
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• 2003

The focus of this research was concerned with studying lower body type for Korean adult males. To understand the features of men's lower body required to organize an optimal sizing system for men's tight-fit slacks, information from the measuring values based on research on the physical standard of the nation(l997) were summarized; in addition, a factor analysis and a cluster analysis among multivariate analyses were performed. In terms of the need for appropriate fit in motorcycle wear, basic lower body parts applying to each item had to be taken into consideration to enhance sizing suitability. In the case of the length of the lower limbs, the inclusion of protectors plays an important role in affecting sizing. The factors related to the lower body were defined as follows: Factor 1 was the vertical dimension of the lower body, Factor 2 was the horizontal dimension of waist and hip, Factor 3 was the horizontal dimension of the lower limbs, Factor 4 was the length of hips, and Factor 5 was the ankle height. The lower body part was also divided into 3 clusters. Cluster 1 referred to the smallest stature and skeleton structure among the 3 body types. Cluster 2 represented the biggest stature, with a thin lower limbs body type. Cluster 3 represented a medium stature but with a large skeleton structure of lower limbs, a muscular type. In conclusion, Cluster 2 appeared most in the 20s age groups, but Cluster 3 appeared most in each of the 30s, 40's, and 50's age groups.

• 대한전자공학회논문지SD
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• 제39권5호
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• pp.87-94
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• 2002

본 논문에서는 기존의 배열구조의 문제점인 전력낭비와 느린 연산속도를 보완하기 위하여 병렬배열구조를 채택하고 비동기 시스템에 적합하도록 평균 연산속도를 최소화한 곱셈기를 제안한다. 실험 결과 제안된 비대칭 병렬배열구조는 기존의 배열구조와 비교하였을 때, 평균 55% 정도의 연산시간 단축이 가능하며, 이 구조를 이용한 Booth 인코딩 비동기 곱셈기는 기존의 Booth 인코딩 배열 곱셈기에 비해 40% 정도의 시간 단축 효과가 있음을 확인하였다.

• 전기학회논문지
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• 제58권1호
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• pp.155-159
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• 2009

To increase the luminance and luminous efficacy in the discharge for alternating current plasma display panel (ac PDP), the increment of Xe contents and long discharge gap are necessary. However, the driving voltage and the cost of driving circuit increases in the high Xe contents and long discharge path condition. In this paper, a long gap ITO hump electrode (LGH) model for discharge cells of ac PDP is evaluated in the various Xe contents($5{\sim}20%$). The discharge voltage of LGH structure is lower about 30V than that of ITa reference structure with same main discharge gap. The LGH structure has lower power consumption and higher luminance than those of reference structure, respectively. Also, the luminous efficacy of LGH structure is higher about 20% than that of ITO reference structure in the 20% Xe contents.

• 인터넷정보학회논문지
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• 제3권2호
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• pp.57-67
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• 2002

본 논문에서는 TMN개념을 도입하여 관리 망의 물리구조를 설계하는 것을 목표로 하였다. 통신망의 종합적인 관리를 위한 관리 망의 구조를 계층적으로 분석하여 하위계층에 해당하는 물리계층의 구조를 설계하였다. 특히 TMN개념을 이용하였을 때의 물리구조에 기본이 되는 TMN-DCN을 설계의 대상으로 하였고 신속한 관리정보의 송·수신으로 망 관리의 효율을 높일 수 있는 설계방법을 제안하고 설계를 실시하였다. 결과적으로 물리구조를 구성하는 총 링크설치 비용이 어느 정도(4.8-7.1%, 정도)증가 하지만 관리정보를 가장 빠르게 전송(약 5.0 %)할 수 있었다.

• The Journal of Asian Finance, Economics and Business
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• 제8권11호
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• pp.213-221
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• 2021

The paper attempts to investigate the optimal capital structure of Vietnamese listed firms based on a structural approach. Using the data from around 70 companies in the Consumer Staples sector listed on the Vietnamese Stock Exchange during the period 2018-2020, this study finds that the optimal capital structure of examined companies has a wide range of diversification. This can be explained by the various types of actual products for each typical firm within the chosen sector. The result also confirms that a large proportion of researched firms were actually overleveraged, which is consistent with the trade-off hypothesis that firms wish to take tax advantages while using more debt, which creates the benefits from tax-shield. Furthermore, the research highlights the reversed correlation, which suggests that the lower the company's risk (the lower the sigma of the assets), the greater the optimal capital structure is suggested. Another interesting finding is that almost all consumer staples companies have a better optimal capital structure under the Leland and Toft (1996) model than under the Leland (1994) model. Furthermore, there is a strong correlation of optimal financial leverage ratio between years. In other words, the optimal debt levels of the latter year are strongly dependent on the gearing levels of the previous years.

• 대한지역사회영양학회지
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• 제10권2호
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• pp.234-242
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• 2005

This study was conducted to evaluate the sanitary management status of school foodservice in Deajeon and Chungnam and to suggest basic data for sanitary improvement. A questionnaire was used in this study as a survey method. The subjects consist of 529 dietitians that are employed in the school ($primary{\cdot}middle{\cdot}high\;school$) foodservice. These results may be summarized as follows : $71.0\%$ of surveyed school foodservices managed separately place for contamination and uncontamination. $91.5\%$ didn't maintain adequate temperature at kitchen. A holding rate of hygiene utensils is lower in Chungnam than Daejeon. The dietitian group aged 30-34 showed significantly higher scores than other groups in personal hygiene of employees. The dietitian group graduated from a college showed significantly lower scores than other groups in purchasing & receiving, preparation, storage, food remains & waste, kitchen utensils and equipments and personal hygiene. It was significant to sowing, personal hygiene and facilities & structure by Daejeon and Chung-nam. In serving, Daejeon showed significantly lower scores than Chungnam. In personal hygiene, facilities and structure, Chungnam showed significantly lower scores than Daejeon. The foodservice group (started < 1990) showed significantly lower scores than other groups ($started{\ge}1990$) in preparation.

• 한국자동차공학회논문집
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• 제13권1호
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• pp.119-125
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• 2005

The current automotive is seeking the improvement of performance, the prevention of environmental pollution and the saving of energy resources according to miniaturization and lightweight of the components. And the variance analysis on the basis of structure analysis and DOE is applied to the lower control am. We have proposed a statistical design model to evaluate the effect of structural modification by performing the practical multi-objective optimization considering weight, stress and fatigue lift. The lower control arm is performed the fatigue analysis using the load history of real road test. The design model is determined using the optimization of acquired load history with the fatigue characteristic. The characteristic function is made use of the optimization according to fatigue characteristics to consider constrained function in the optimization of DOE. The structure optimization of a lower control arm according to fatigue characteristics is performed. And the optimized design variable is D=47 m, T=36mm, W=12 mm. In the real engineering problem of considering many objective functions, the multi-objective optimization process using the mathematical programming and the characteristic function is derived an useful design solution.

• 한국구조물진단유지관리공학회 논문집
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• 제25권5호
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• pp.60-67
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• 2021

국토교통부(2018)의 「필로티 건축물 구조설계 가이드라인」에서는 국내 필로티 형식의 다세대 주택과 같이 중저층의 상부벽식 하부 골조구조를 이루고 있는 복합구조의 고유주기를 안전성을 고려하여 상부 벽식구조에 해당하는 식을 적용하도록 제시하고 있다. 그러나 현행 벽식구조의 고유주기 산정 기준식은 주로 휨 거동하는 고층 벽식구조를 대상으로 한 실측 결과를 통하여 제정된 것으로서 벽체가 전단거동을 하는 국내 4층이하 필로티형 다세대 주택에는 적합하지 않을 것으로 사료되며, 또한, Park et al. (2000)은 해석적 연구를 통하여 10층 이상의 복합구조물의 고유주기에서 하부 골조구조의 영향이 상부 벽식구조보다 크게 작용하고 있음을 확인하였다. 따라서 본 연구에서는 중저층 필로티 구조의 고유주기에 미치는 하부골조의 영향을 검토하기 위하여 상부 벽식구조의 전단 및 휨 강성과 하부골조구조의 전단강성을 변수로 하는 대상 구조물들에 대하여 유한요소 모델을 이용한 고유치 해석과 고유주기 산정 근사식 그리고 현행 고유주기 산정 기준식을 이용하여 고유주기를 산출하고 비교하였다. 비교결과 하부골조의 전단강성변화가 상부벽체의 휨 또는 전단강성의 변화보다 건물 전체의 고유주기에 더 큰 영향을 주는 것으로 나타났다.