폴리스타이렌 아이오노머와 액정중합체 블렌드의 기계적 성질

김희석,김준섭,최재곤,박기주,윤용국,진정일 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

The dynamic mechanical properties of thermotropic liquid crystalline polyester (LCP) blends with polystyrene (PS) and Li sulfonated polystyrene (PSSLi) were investigated. It was found that PS forms an immiscible blend with LCP. However, above the matrix T_(g) of the PS, the addition of the LCP increases the modulus of the blend significantly because the LCP acts as filler below its T_(g). In PSSLi/LCP blend system, it was also found that, in the temperature range between two T_(g)s of the ionomer, the LCP acts as filler and thus increases the modulus of the blend. However, the filler effect of the LCP on the modulus decreases rapidly with increasing temperature and disappears above the T_(g) of the LCP. Finally, it was suggested that the PSSLi may be partially miscible with the LCP via ion-dipole interactions between a Li^(+) cation of the PSSLi and a carbonyl group of the LCP.

새로운 열방성 액정중합체의 합성과 PET와의 블렌드

조정대,김희종,최재곤,조병욱,유지강 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

Blends of new thermotropic liquid crystalline polymer(TLCP) with poly(ethylene terephthalate)(PET) were prepared by the coprecipitation from a common solvent. The thermal, mechanical properties and morphology of the blends(2wt%, 5wt%, lOwt% and 20wt% TLCP/PET) were examined. In the blends, liquid crystalline phase did not reveal any significant macrophase separation and thermal degradation at the processing temperature. According to the scanning electron micrograps, the TLCP domains in matrix were found to be more or less finely dispersed with 0.2㎛ to 0.4㎛ in size and interfacial adhesion between the TLCP and matrix polymer was excellent. Results of mechanical property measurement show that modulus of TLCP/PET blend was enhanced with increasing TLCP content.

발아현미의 본태성 고혈압쥐에 대한 혈압강하 효과

최희돈(Hee-Don Choi),김윤숙(Yun-Sook Kim),최인욱(In-Wook Choi),박용곤(Yong-Kon Park),박영도(Young-Do Park) 한국식품과학회 2006 한국식품과학회지 Vol.38 No.3

삼투건조와 진공주입이 사과 건조제품의 품질에 미치는 영향

최희돈(Hee-Don Choi),이해창(Hae-Chang Lee),김윤숙(Yun-Sook Kim),최인욱(In-Wook Choi),박용곤(Yong-Kon Park),석호문(Ho-Moon Seog) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.2

삼투건조와 진공주입에 의한 사과의 물질이동 특성과 열풍건조 시 건조특성, 그리고 제조한 사과 건조제품의 품질을 비교하였다. 삼투건조 시 사과 시료의 중량이 감소하고 수분손실이 증가한 반면 진공주입 시에는 중량이 증가하고 수분손실이 감소하였으며, 진공주입 시 고형분 증가가 컸다. 50℃에서의 열풍건조시 건조시간에 따른 사과 시료의 수분함량 변화를 Page model에 적용하여 지수 n, k 및 건조시간을 산출하였다. 건조시간이 대조구의 4.45 hr에서 삼투건조 시 5.82 hr, 진공주입 시 6.38 hr로 증가하는 반면 k는 대조구의 0.456 hr?¹에서 각각 0.326 hr?¹과 0.277 hr?¹로 감소하였으며, n은 대조구의 0.938에서 각각 0.754와 0.950으로 변화하였다. 삼투건조 및 진공주입한 사과 건조제품의 품질을 대조구와 비교하였다. 삼투건조에 의해 건조제품의 수축도와 복원력이 대조구에 비해 크게 감소한 반면 압착력이 크게 증가하였고 적정산도와 ascorbic acid의 함량이 크게 감소하였다. 진공주입에 의해서는 대조구에 비해 수축도와 압착력이 증가하였다. 복원한 사과 건조제품에 대한 관능적 기호도 측정 결과 삼투건조한 사과 건조제품이 외관, 조직감, 종합적인 기호도 등의 모든 관능검사 항목에서 유의적으로 높은 기호도를 나타내었고, 건조상태에서의 관능적 기호도 측정 결과에서는 진공주입한 사과 건조제품이 모든 관능검사 항목에서 유의적으로 높은 기호도를 나타내었다. This study investigated the effects of osmotic dehydration (OD) and vacuum impregnation (VI) on the quality of dried apple products. Weight reduction and water loss increased during OD, but these decreased in the apples during VI. In particular, VI’s effect on increasing solid gain was superb. For apples in 40% sucrose solution, OD and VI were followed by hot-air drying at 50℃. The experimental data were fitted successfully using the modified Page model. OD and VI increased drying time and decreased the drying rate constant of these apples as compared to the control. Shrinkage and rehydration capacity greatly decreased in the apples dried by OD and increased in the apples dried by VI as compared to the control. OD also decreased titratable acidity and ascorbic acid content considerably. Sensory evaluations of the products indicated that the apples prepared by OD had higher palatability in their rehydrated form in yoghurt, and the apple products prepared by VI had higher palatability in their dried form.

RISC-V 플랫폼 기반 CNN 모듈의 버퍼링 분석

김진영 ( Jin-young Kim ),임승호 ( Seung-ho Lim ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1

최근 임베디드 엣지 컴퓨팅 디바이스에서 AI와 같은 인공지은 연산을 수행하여 AI 추론 연산의 가속화 및 분산화가 많이 이루어지고 있다. 엣지 디바이스는 임베디드 프로세서를 기반으로 AI의 가속 연산을 위해서 내부에 딥러닝 가속기를 포함하여 가속화시키는 시스템 구성을 하고 있다. 딥러닝 가속기는 복잡한 Neural Network 연산을 위한 데이터 이동이 많으며 외부 메모리와 내부 딥러닝 가속기 간의 효율적인 데이터 이동 및 버퍼링이 필요하다. 본 연구에서는 엣지 디바이스 딥러닝 가속기 내부의 버퍼 구조를 모델링하고, 버퍼의 크기에 따른 버퍼링 효과를 분석해 보았다. 딥러닝 가속기버퍼 구조는 RISC-V 프로세서 기반 가상 플랫폼에 구현되었다. 이를 통해서 딥러닝 모델에 따른 딥러닝 가속기 버퍼의 사용성을 분석할 수 있다.

삼투건조와 열풍건조의 조합이 사과 건조제품의 품질에 미치는 영향

최희돈(Hee-Don Choi),이해창(Hae-Chang Lee),김윤숙(Yun-Sook Kim),최인욱(In-Wook Choi),박용곤(Yong-Kon Park),석호문(Ho-Moon Seog) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.1

삼투건조와 열풍건조의 조합이 사과 건조제품의 품질에 미치는 영향을 알아보기 위하여 삼투건조시 물질이동 특성과 열풍건조시 건조특성, 그리고 사과 건조제품의 품질을 조사하였다. 삼투건조시 침지용액의 농도와 침지시간이 증가함에 따라 중량감소와 수분손실이 증가하였으며 고형분 증가도 같은 경향을 나타내었다. 열풍건조시 건조시간에 따른 사과 실린더의 수분함량 변화를 Page model에 적용하여 지수 n, k 및 건조시간을 산출하였다. 건조온도 50℃에서 건조시간이 대조구의 4.15시간에서 30%와 50% sucrose 용액 처리시 각각 5.78시간과 6.42시간으로 증가하였으며, 건조온도 70℃에서도 유사한 경향인 것으로 나타났다. 삼투건조에 의해 k와 n 값이 감소하였고 삼투용액의 농도가 높을수록 더욱 감소하는 것으로 나타났다. 삼투건조한 사과 건조제품의 품질을 삼투건조하지 않은 사과 건조제품과 비교하였다. 삼투건조에 의해 건조제품의 수축도와 복원력이 감소하였고 침지용액의 농도가 높을수록 감소하는 것으로 나타났다. 압착력은 삼투건조에 의해 증가하였고 침지용액의 농도가 높을수록 증가하는 것으로 나타났다. 복원한 사과 건조제품에 대한 관능적 기호도 측정 결과 외관, 조직감, 종합적인 기호도 등의 모든 관능검사 항목에서 삼투건조한 사과 건조제품이 삼투건조하지 않은 대조구에 비해 유의적으로 높은 기호도를 나타내었다. This study was conducted to investigate the effects of combined osmotic dehydration and hot-air drying on the quality of dried apple products. Apple cylinders were steeped in 30% and 50% sucrose solutions at different steeping times. During the osmotic dehydration, as the concentration of the sucrose solution and steeping time increased, weight reduction and water loss increased, and the solid gain showed similar results. Osmotic dehydration in the sucrose solutions was followed by hot-air drying at 50 and 70℃. The experimental data were fitted successfully using the modified Page model. At the drying temperature of 50℃, the drying time increased from 4.15 hr for the control to 5.78 hr and 6.42 hr for the 30 and 50% sucrose solution treatments, respectively. Similar results were shown at the 70℃ drying temperature. The k and n values of the apple cylinders decreased by osmotic dehydration, and the k and n of the apple cylinders steeped in the 50% sucrose solution were lower than those of the samples steeped in the 30% sucrose solution. The qualities of the dried apple products were compared to samples that did not undergo osmotic dehydration. The shrinkage and rehydration capacity of the apple products decreased via osmotic dehydration, and decreased as the concentration of the sucrose solution increased. The compressibility ratios of the apple products to raw apple cylinders increased by osmotic dehydration, and increased as the concentration of sucrose solution increased. The sensory evaluation results for the apple products rehydrated in yoghurt indicate that osmotic dehydration greatly enhances the palatability of apple products in terms of appearance, taste, and texture.

Leukocyte Common Antigen-Related (LAR) Tyrosine Phosphatase Positively Regulates Osteoblast Differentiation by Modulating Extracellular Signal-Regulated Kinase (ERK) Activation

Kim, Won-Kon,Bae, Kwang-Hee,Choi, Hye-Ryung,Kim, Do-Hyung,Choi, Kwang-Soo,Cho, Yee-Sook,Kim, Hee-Dai,Park, Sung-Goo,Park, Byoung-Chul,Ko, Yong,Lee, Sang-Chul Korean Society for Molecular and Cellular Biology 2010 Molecules and cells Vol.30 No.4

Protein tyrosine phosphatases (PTPs) are pivotal regulators of key cellular functions, including cell growth, differentiation, and adhesion. Previously, we reported that leukocyte common antigen-related (LAR) tyrosine phosphatase promotes osteoblast differentiation in MC3T3-E1 preosteoblast cells. In the present study, the mechanism of the regulatory action of LAR on osteoblast differentiation was investigated. The mineralization of extracellular matrix and calcium accumulation in MC3T3-E1 cells were markedly enhanced by LAR overexpression, and these effects were further increased by treatment with an MEK inhibitor. In addition, LAR overexpression dramatically reduced extracellular signal-regulated kinase (Erk) activation during osteoblast differentiation. In contrast, a marginal effect of the inactive LAR mutant on Erk activation was detected. Expression of osteoblast-related genes such as ALP, BSP, DLX5, OCN, and RUNX2, was increased by LAR overexpression during osteoblast differentiation. On the basis of these results, we propose that LAR functions as a positive regulator of osteoblast differentiation by modulating ERK activation. Therefore, LAR phosphatase could be used as a novel regulatory target protein in many bone-associated diseases, including osteoporosis.

A Comparison of the Results from Somatotype Evaluation with Different Evaluation Tools

Wan Suk Choi,Jung Hyun Choi,Mi Suk Cho,Ok Kon Moon,Joo Hyun Park,Hyung Kuk Chung,Suk Hee Lee,Jung Sook Lee,Kyung Ok Min 국제물리치료학회 2010 Journal of International Academy of Physical Ther Vol.1 No.1

Supposing that somatotype evaluation results would have significant differences between the public group with less amounts of exercises and the special group with intensive exercises for three to four times a day, this study aimed at comparing the mutual consistency between the results determined by somatotype evaluation tools such as visually calculated index(VCI), Rohrer's Index(RI) and Body Mass Index(BMI). The public, taekwondo players and judo players groups were com˗ posed of fifty persons, taekwondo players and judo players passed through VCI determination, respectively. Their height and weight were examined and analyzed with somatotype evaluation tools. Comparison of somatotype dispersion of RI and VCI showed that most women were determined by VCI as lean type but were deter˗ mined by RI as normal type. And that women were determined by VCI as fat type but were determined by RI as normal type. Therefore both men and women showed significant differences in VCI and RI. Comparison of somatotype dispersion of VCI and BMI showed that both men and women were overestimated or underestimated by VCI rather than by BMI. Comparison of somatotype dispersion of RI and BMI showed that men were less determined by BMI as lean type compared with women; both men and women less determined by BMI rather than by RI as normal type; and both men and women, in particular, were more determined by BMI as fat type but men were more determined by BMI rather than by RI as fat type. Total somatotype consistency by tools showed that VCI has the greatest possibility of determining the public group, compared with other groups as lean type and that the consistency of the three tools were relatively higher for the taekwondo players and judo players groups, compared with the public.

A Study on the Transition and Classification of Somatotyping

Wan Suk Choi,Ok Kon Moon,Jung Hyun Choi,Bo Kyoung Kim,Joong San Wang,Hong Rae Kim,Joo Hyun Park,Young Hwa Song,Hyun Sook Hwang,Soon Hee Kim 국제물리치료학회 2013 Journal of International Academy of Physical Ther Vol.4 No.1

Experts of medicine, philosophy and psychology found that human somatotypes were related to personality or physical characteristics and classified somatotypes into various forms. This study explored the changes and types of somatotyping methods from Before Christ to present day and identified the status of studies of somatotypes in the area of physical therapy. This study covered the methods applied in various majors with a focus on those provided in books and papers of Heath BH. and Carter JEL. Based on the results, there are officially twelve assessment methods. Currently, the method of Heath & Carter is most widely applied. Somatotypes are studied in many areas. It is actively explored in the area of pain physical therapy, thermotherapy and integumentary physical therapy. Also, the soft tissue physical therapy area seeks interdisciplinary studies. This study found that there were various assessment methods in diverse areas. It is likely that continuous studies will develop new assessment methods. It is hoped that in the area of physical therapy, somatotypes shall be applied more amply.

PP-05 : Analysis of Rice Cytochrome c Gene Promoter

(Won Bin Choi),(Je Ni Choi),(Kyung Hee Lee),(Ju Eun Chun),(Baek Hee Nahm),(Ju Kon Kim) 한국응용생명화학회(구 한국농화학회) 1999 한국응용생명화학회 학술발표회 Vol.1999 No.1