• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.441-444
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• 2011

폴리우레탄 계열 바인더용 Prepolymer로 많이 사용되고 있는 HTPB의 상용모델에는 Type A와 Type B 2종류의 모델이 있다. 이에 국내외에서 생산되고 있는 이 2가지 모델에 대해 이화학적 특성과 주장약 PBX-A에 적용하여 점도 및 기계적 특성 등을 연구하였다. Type A는 Hydroxy value가 낮아 주장약에는 적용하기 힘들다고 판단되어 시험에서 제외하였으며, Type B의 경우 Type B-3 대비 Type B-1, 2를 공정에 적용하기에는 불리한 기계적 특성을 보였다. 하지만 Type B-2, 3의 공정조건(당량비/경화조건)을 규격 내에서 변경 적용한다면 이상은 없을 듯하나 Type B-3와 같은 공정조건으로 적용하기 위해서는 높은 Hydroxyl Value와 Functionality의 HTPB를 적용할 필요가 있다.

• 한국식생활문화학회지
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• 제14권3호
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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.

• 한국초지조사료학회지
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• 제14권2호
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• pp.82-87
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• 1994

이탈리안 라이그라스 37개 품종을 대상으로 ADH와 Esterase 의 Isozyme을 Starch gel 전기영동법을 이용하여 분리한 후 염색하여 품종간 band 의 차이점을 비교하였다. 1. ADH isozyme은 Rf 0.60과 0.63 두 개의 band zone으로 나타났으며 Rf0.60이 main band이었다. 2. ADH isozyme의 banding pattern은 5개의 type으로 구별이 되었는데 type I은 7개품종, type II는 2개 품종, type III는 6개 품종, type IV은 18개 품종, type V는 4개 품종이었다. 3. Esterase isozyme은 Rf 1.00으로 한 개의 band만 나타났다. 4. Esterase isozyme의 banding pattern은 3개 type으로 구별되었는데 type I은 22품종, type II는 8품종, type III는 7개 품종이었다. 5. ADH와 Esterase isozyme의 banding pattern 으로 본 이탈리안 라이그라스의 품종별 차이는 없으나 염색 강도에 따라 일부 품종의 변이를 구분할 수 있었다.

• 한국의상디자인학회지
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• 제25권4호
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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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• 제33권1호
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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.

• 한국산학기술학회논문지
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• 제16권2호
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• pp.1563-1570
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• 2015

본 연구는 올리고펩티드의 연쇄성장 과정에서의 배좌의 변화를 조사하기 위하여 알라닌 올리고머 모델의 2량체 부터 5량체 까지 양자화학 계산(QCC)에 의한 구조최적화 계산을 하였다. 말단기의 영향을 확인하기 위하여 N말단 및 C말단이 공히 amide 구조를 갖는 "amide type" ($CH_3CONH-and-CONHCH_3$)과 N말단만이 methyl 구조를 갖는 "methyl type" ($CH_3NH-and-CONHCH_3$)의 2종류 모델을 준비하였다. 5량체 까지의 구조 최적화 계산 결과 3종류의 형태이성질체로 수렴이 되었다. 안정성이 높은 순서로 각각 ${\alpha}$ 나선형, PPII 유사형, ${\beta}$ 확장형으로 나타났으며, 사슬회전 방향이 서로 반대인 형태이성질체간의 에너지 값은 동일하게 나타났다 (5량체, "amide type" 좌 우회전형: ${\Delta}E=-1.05$, "methyl type" 좌 우회전형: ${\Delta}E=-1.62$). ${\alpha}$ 나선형의 모노머 단위당 에너지변화(${\Delta}E$)는 모노머의 증가와 함께 감소하였다.

• Biomolecules & Therapeutics
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• 제26권5호
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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.

• 대한수학회지
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• 제41권6호
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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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• 한국전기화학회 2005년도 수소연료전지공동심포지움 2005논문집
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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.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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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.