• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.441-444
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• 2011

Type A and Type B and are commercial HTPB models, which are very popular prepolymer for polyurethane binder family. So the study has been performed on the physical, chemical characteristic of HTPB and viscosity, mechanical property of PBX-A applying to HTPB. But We excluded the Type A from Appication test, because of law Hydroxyl value. And in the case of Type B, Type B-1, 2 has mechanical disadvatage to apply to HTPB in the process comparing with B-3. It seems to make no problem if we change equivalence ratio or curing condition within standards. But if we are to apply process condition like R-45HT(US-sample), it would be essential to apply HTPB with higher Hydroxyl Value and hydroxyl Functionality.

• Journal of the Korean Society of Food Culture
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• v.14 no.3
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• pp.233-239
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• 1999

This study was to investigate the factors which influence foodservice dietitians' job satisfaction and dissatisfaction by the elementary school foodservice type using questionnaires. The results of the study are as followings : 1) Foodservice types of the subjects were urban 49(23.2%), country 141(66.8%) and island 21(10.0%). 79.6% of the urban type were operated by the conventional, independent management system, where 38.3% of the country and 52.4% of the island type were operated by conventional, joint management system. 2) Urban type dietitians showed significantly lower satisfaction on their salary & promotion(1.5) compare to country & island types(p<0.05). Island type dietitians showed significantly lower satisfaction on the student's health improving(2.4) compare to country &urban types(p<0.05). 3) Dietitians of urban type were dissatisfied more 'personnel management(3.2)' than dietitians of other two types. Dietitians of country type and island type were dissatisfied more 'extra work load(2.6)' than dietitians of urban type. 4) Work load was lots orderly island, country and urban types. Working attitudes were the most positive at dietitians of urban type and the most negative at dietitians of island type. 5) Job satisfaction and dissatisfaction of dietitians were correlated with number of meals, number of school transfer, cook license, additional job and school foodservice location type.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.2
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• pp.82-87
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• 1994

This study was planned to identify the variety of Italian ryegrass using electrophoresis. Thirty seven varieties of Italian ryegrass were tested by starch gel electrophoresis. The specific electrophoretic zymograms of each variety were observed by Alcohol dehydrogenase(ADH) and Esterase. The results were surnrnerized as follows; 1. AU varieties displayed two band zones by ADH and Rf values were 0.63 and 0.6 (Table 2, Fig. 2). 2. There were five band type for ADH isozyme of 37 varieties classified with isozyme banding pattern. According to the isozyme band type 7, 2, 6, 18 and 4 varieties belong to group, I, II, III, IV, and V, respectively (Table 2). 3. The varieties displayed single band zone for Esterase isozyme and Rf value was 1.00 (Table 2, Fig. 4). 4. According to banding type, Esterase isozyme of 37 varieties classified into 3 groups, 22, 8 and 7 varieties belong to group, I , II, and III, respectively (Table 2).

• Journal of the Korea Fashion and Costume Design Association
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• v.25 no.4
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• pp.147-161
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• 2023

This study used 3D anthropometric data from the 8th Size Korea to type and analyze whole body shapes of obese women in their 20s and 30s, and constructed dimensional data for human body items needed to create a 3D human body model for each type. The data analysis used data from 148 obese women in their 20s and 30s, and a total of 48 index values, drop values, and angle items were subjected to factor analysis and one-way variance analysis to categorize body types and verify significant differences by type. As a result of the factor analysis, 12 factors were extracted and divided into 4 body types. Type 1 is a 'standard type with a curved torso with balanced upper and lower body lengths', Type 2 is a 'bending forward type with a short, thick lower body, and an uncurved torso', Type 3 is a 'lean back type with a long and thin lower body and an H-shape torso', Type 4 is a 'sway back type with a long and thick lower body and abdominal obesity'. The representative body type of obese women in their 20s and 30s was identified as Type 1. The constructed body shape information will be used as basic data for future 3D human body modeling.

• Imaging Science in Dentistry
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• v.33 no.1
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• pp.51-57
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• 2003

Purpose: To investigate the effects of irradiation on the phenotypic expression of the MC3T3-El osteoblastic cell line, particularly an the expression of type I collagen and alkaline phosphatase mRNA. Materials and Methods: Cells were irradiated with a single dose of 0.5, 1, 2, 4, and 8 Gy at a dose rate of 5.38 Gy/min using a cesium 137 irradiator. The specimens were then harvested and RNA extraction was carried out at 1 and 3 days after irradiation. The extracted RNA strands were reverse-transcribed and the resulting cDNA fragments were amplified by PCR. Results: The irradiated cells demonstrated a dose-dependent increase in type I collagen mRNA expression relative to the control group, with a maximum level of type I collagen mRNA expression occurring at 8 Gy. The degree of type I collagen mRNA expression increased significantly at 1 day after irradiation, but little differences were found between the control group and at the 3rd day. The amount of alkaline phosphatase mRNA expression increased significantly at land 3 days after irradiation in the 1 Gy exposed group compared with the control group. Conclusion: The amount of type I collagen and alkaline phosphatase mRNA expression increased significantly 1 day after irradiation when compared with the control group.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.1563-1570
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• 2015

Conformational change during chain propagation of alanine oligomer was investigated by quantum chemical calculation(QCC) using 2~5mers(${\times}=2{\sim}5$) models. For estimation of the end group effects, two types of end group. "amide type" ($CH_3CONH-and-CONHCH_3$) and "methyl type" ($CH_3CONH-and-CONHCH_3$), were prepared as both ends(N-and-C). Conformers optimized for 5-mer converged to three types of ${\Phi}/{\Psi}$ : ${\alpha}$-helix(g+/g+, or g-/g-), PPII-like(extended helix-like, g+/g-, or g-/g+), and ${\beta}$-extended (t+/t-, or t-/t+), in the order of lower energy, and the energies of left- and right- handed conformers were the same (5-mer. amide type ${\Delta}E=-1.05$, right type ${\Delta}E=-1.62$). Energies of the monomer unit(${\Delta}E$) of ${\alpha}$-helix decreased with increases of monomer.

• Biomolecules & Therapeutics
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• v.26 no.5
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• pp.439-445
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• 2018

T-type calcium channels are low voltage-activated calcium channels that evoke small and transient calcium currents. Recently, T-type calcium channels have been implicated in neurodevelopmental disorders such as autism spectrum disorder and neural tube defects. However, their function during embryonic development is largely unknown. Here, we investigated the function and expression of T-type calcium channels in embryonic neural progenitor cells (NPCs). First, we compared the expression of T-type calcium channel subtypes (CaV3.1, 3.2, and 3.3) in NPCs and differentiated neural cells (neurons and astrocytes). We detected all subtypes in neurons but not in astrocytes. In NPCs, CaV3.1 was the dominant subtype, whereas CaV3.2 was weakly expressed, and CaV3.3 was not detected. Next, we determined CaV3.1 expression levels in the cortex during early brain development. Expression levels of CaV3.1 in the embryonic period were transiently decreased during the perinatal period and increased at postnatal day 11. We then pharmacologically blocked T-type calcium channels to determine the effects in neuronal cells. The blockade of T-type calcium channels reduced cell viability, and induced apoptotic cell death in NPCs but not in differentiated astrocytes. Furthermore, blocking T-type calcium channels rapidly reduced AKT-phosphorylation (Ser473) and $GSK3{\beta}$-phosphorylation (Ser9). Our results suggest that T-type calcium channels play essential roles in maintaining NPC viability, and T-type calcium channel blockers are toxic to embryonic neural cells, and may potentially be responsible for neurodevelopmental disorders.

• Journal of the Korean Mathematical Society
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• v.41 no.6
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• pp.1007-1021
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• 2004

In this paper, we study rotation surfaces in the Minkowski 3-dimensional space with pointwise 1-type Gauss map and obtain by the use of the concept of pointwise finite type Gauss map, a characterization theorem concerning rotation surfaces and constancy of the mean curvature of certain open subsets on these surfaces.

• 한국전기화학회:학술대회논문집
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• 2005.07a
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• pp.201-206
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• 2005

본 연구는 기 개발 완료된 천연가스차량용 200bar급 Type 3 복합재 압력용기를 개발로 축척된 핵심요소기술과 실질적인 경험을 바탕으로 수소연료전지 차량에 탑재할 350bar급 Type 3 복합재 압력용기에 대한 설계/해석과 시험평가의 핵심적인 사항을 고찰하였다. 설계/해석에는 350bar급 Type 3 복합재 압력용기에 대한 3차원 비선형 유한요소 모델링 및 해석기법이 제시되었고, 설계된 라이너형상과 와인딩 패턴을 이용하여 필라멘트 와인딩 공법으로 1차시제품을 제작하였다. 제작된 시제품에 대하여 파열시험 및 반복피로시험을 수행하여 설계/해석 기법의 타당성을 검증하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.317-320
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• 1999

In this study, the piezoelectric ceramics PZT powder was synthesized by Wet-Dry combination method. And the flexible 1-3-0 type composites were fabricated with piezoceramic PZT and Eccogel polymer matrix embedded 3rd phase. Dielectric constant of 1-3-0 type composites was lower than that of single phase PZT ceramics. Thickness mode coupling factor k/sub t/ which was comparable with single phase PZT ceramics and mechanical quality factor Qm were about 0.65 and 6, respectively. These composites are considered as a good candidates for broad-band type transducer applications. The acoustic impedance of 1-3-0 type composites was lower than that of single phase PZT ceramics. Therefore, these composites would be better used for hydrophone applications.