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Joo‑Youl Huh,Min‑Je Hwang,Seung‑Woo Shim,Tae‑Chul Kim,Jong‑Sang Kim 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6
The reactive wetting behaviors of molten Zn–Al–Mg alloys on MnO- and amorphous (a-) SiO2-covered steel sheets wereinvestigated by the sessile drop method, as a function of the Al and Mg contents in the alloys. The sessile drop tests werecarried out at 460 °C and the variation in the contact angles (θc) of alloys containing 0.2–2.5 wt% Al and 0–3.0 wt% Mg wasmonitored for 20 s. For all the alloys, the MnO-covered steel substrate exhibited reactive wetting whereas the a-SiO2-coveredsteel exhibited nonreactive, nonwetting (θc > 90°) behavior. The MnO layer was rapidly removed by Al and Mg contained inthe alloys. The wetting of the MnO-covered steel sheet significantly improved upon increasing the Mg content but decreasedupon increasing the Al content, indicating that the surface tension of the alloy droplet is the main factor controlling its wettability. Although the reactions of Al and Mg in molten alloys with the a-SiO2 layer were found to be sluggish, the wettabilityof Zn–Al–Mg alloys on the a-SiO2 layer improved upon increasing the Al and Mg contents. These results suggest that thewetting of advanced high-strength steel sheets, the surface oxide layer of which consists of a mixture of MnO and SiO2,withZn–Al–Mg alloys could be most effectively improved by increasing the Mg content of the alloys.
Using CALL Lab in the EFL Classroom for College Students
Hwang, Joo-hyuck 새한영어영문학회 2002 새한영어영문학 Vol.44 No.2
컴퓨터 관련 기술의 발달로 인해 영어 학습에 있어서 컴퓨터의 역할이 중요시되고 있다. 멀티미디어 컴퓨터를 갖춘 언어실습실(CALL lab)이 대부분의 대학은 물론 각급 학교에까지 설치되어 영어학습에 활용되고 있다. CALL lab에 설치되어 있는 멀티미디어 영어 학습자료들은 소리, 동영상, 등 다양한 자료를 제공, 상호작용 학습, 개별학습, 반복학습, 그리고 흥미와 동기유발 등의 장점을 포함하고 있다. 이 장점은 영어 교수 및 학습에 많은 공헌을 할 수 있으며, 특히 영어 학습 시간이 부족하고, 포괄적인 영어학습을 위한 원어민과의 접촉 기회가 절대적으로 부족한 실정에서의 CALL lab의 활용은 이러한 문제점을 보완할 수 있는 그 대안이 될 수 있다. 따라서 본 연구는 CALL의 정의와, 영어 교수 및 학습에 CALL이 필요한 이유, 그리고 영어 교수 및 학습에 있어서 CALL 어떻게 활용되는지를 살펴보고 아울러 멀티미디어 CALL lab의 효과적인 활용방안의 기본이 되는 3가지 유형--- 완성된 영어 학습 자료(CD-Rom Title)를 통한 수업, 특정의 자료 없이 인터넷을 활용한 수업, 그리고 자율학습에 활용하는 방법---을 제시하고자 한다. 그러나 CALL lab에서 활용되는 멀티미디어 학습자료가 교수자를 완전히 대체하거나 학습효과를 획기적으로 높여 주지 못한다. CALL lab 자체보다 CALL lab에서 멀티미디어를 활용하는 교수학습 모형이나 구체적이고 체계적인 수업모형 등을 개발하여 효과적으로 수업현장에 적용하는 것이 중요하다.
Release characteristics of ibuprofen from excipient-loaded alginate gel beads
Hwang, Sung-Joo,Rhee, Gye Ju,Lee, Ki Myung,Oh, Kyoung-Hee,Kim, Chong-Kook 충남대학교 약학대학 의약품개발연구소 1995 藥學論文集 Vol.11 No.-
Ibuprofen-loaded alginate beads were prepared and found to optimize in vitro release with zero-order kinetics. The release of ibuprofen could be controlled by adding excipients or by adjusting the NaAlg/ibuprofen ratio.
Gastric Retentive Drug-Delivery Systems
Hwang, Sung-Joo,Park, Haesun,Park, Kinam 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
The development of a long-term oral controlled-release dosage form has been difficult mainly because of the transit of the dosage form through the gastrointestinal (GI) tract. Several approaches to extend gastric residence time have been tried. The most commonly used systems are (1) intragastric floating systems, (2) high-density systems, (3) mucoadhesive systems, (4) magnetic systems, (5) unfoldable, extendible, or swellable systems, and (6) superporous hydrogel systems. The concept of each approach is examined, and improvements that are needed for further development are discussed. Background materials in the GI physiology that are necessary for understanding the concept and usefulness of each approach are also provided.
Hwang, Chul-joo 新羅大學校 1990 論文集 Vol.29 No.-
위상적 반군에 대한 Swelling 보조 정리에 대해서 Hildebrant가 변형한 정리를 확대하고, 그것을 적용해서 단위 반군에 대한 Swelling 보조 정리를 써서 증명하는 정리 하나를 확장했다.
Hwang, Joo-Yeon,Lee, Seung-Hun,Go, Min-Jin,Kim, Beom-Jun,Kim, Young-Jin,Kim, Dong-Joon,Oh, Ji-Hee,Koo, Hee-Jo,Cha, My-Jung,Lee, Min-Hye,Yun, Ji-Young,Yoo, Hye-Sook,Kang, Young-Ah,Oh, Ki-Won,Kang, Moo- Korea Genome Organization 2011 Genomics & informatics Vol.9 No.2
Osteoporotic fracture (OF), along with bone mineral density (BMD), is an important diagnostic parameter and a clinical predictive risk factor in the assessment of osteoporosis in the elderly population. However, a genome-wide association study (GWAS) on OF has not yet been clarified sufficiently. To identify OF-associated genetic variants and candidate genes, we conducted a GWAS in a population-based cohort (Korean Association Resource [KARE], n=1,427 [case: 288 and control: 1139]) and performed a de novo replication study in hospital-based individuals (Asan and Catholic Medical Center [ACMC], n=1,082 [case: 272 and control: 810]). In a combined meta-analysis, a newly identified genetic locus in an intergenic region at 10p11.2 (near genes FZD8 and ANKRD30A ) showed the most significant association (odd ratio [OR] = 2.00, 95% confidence interval [CI] = 1.47~2.74, p=$1.27{\times}10^{-6}$) in the same direction. We provide the first evidence for a common genetic variant influencing OF and genetic information for further investigation in bone metabolism.
Hwang, Joo-Yeon,Ryu, Min-Hyung,Go, Min-Jin,Oh, Berm-Seok,Cho, Yoon-Shin Korea Genome Organization 2009 Genomics & informatics Vol.7 No.2
Fibrinogen alpha chain (FGA), a subunit of fibrinogen, might be a potential player for type 2 diabetes mellitus (T2DM), since the plasma levels of fibrinogen is known to be related to the incidence of T2DM. To elucidate the potential role of FGA in T2DM, we investigated whether FGA genetic variations are relevant in T2DM in the Korean population. Seven FGA single nucleotide polymorphisms (SNPs) were genotyped in Ansung and Ansan cohorts (474 T2DM subjects and 470 normal controls) in Korea. The association between SNPs and T2DM was determined by logistic regression analysis. Genetic relevance of SNPs to T2DM-related phenotypes was investigated by multiple linear regression analysis. Statistical analysis revealed that among seven FGA SNPs, significant associations with T2DM were observed in FGA rs2070011 (p=0.013-0.034, OR=0.72${\sim}$0.79), rs6050 (p=0.026${\sim}$0.048, OR=1.24${\sim}$1.37), and rs2070022 (p=0.016${\sim}$0.039, OR=0.70${\sim}$0.72). Two SNPs, rs2070011 and rs6050, also showed significant association with T2DM-related phenotypes such as triglyceride (p=0.005${\sim}$0.011 for rs2070011 and p=0.003${\sim}$0.008 for rs6050), total cholesterol (p=0.01 for rs2070011 and p=0.024 for rs6050) and fasting glucose (p=0.035${\sim}$0.036 for rs2070011 and p=0.048 for rs6050) in 470 normal controls. Our association study implies that FGA might be an important genetic factor in T2DM pathogenesis in the Korean population by affecting plasma lipid and glucose levels.
Hwang, Joo-Yeon,Lee, Seung Hun,Kim, Ghi-Su,Koh, Jung-Min,Go, Min-Jin,Kim, Tae-Ho,Hong, Jung-Min,Park, Eui-Kyun,Kim, Shin-Yoon,Lee, Jong-Young Korea Genome Organization 2009 Genomics & informatics Vol.7 No.1
Osteoporosis is characterized by impaired osteogenesis. BMD is a major determinant of bone strength. The role of the VDR gene in predisposition to primary osteoporosis has been recognized. However, population-based case-control studies have been reported controversial results for known candidate genes in an ethnically distinct group. To determine the genetic effects of VDR variants on osteoporosis and BMD, we directly sequenced the VDR gene in 24 unrelated Korean individuals and identified eighteen sequence variants. We investigated the potential involvement of eight SNPs in osteoporosis in postmenopausal women (n = 729). Two SNPs (LD) in intron 2, -5294G>C (rs2238135) and -4817G>A (rs17882443) showed the evidence of association with enhanced BMD of the femoral neck ($p_{additive}$=0.031 for rs2238135; $p_{additive}$=0.017 and $p_{dominant}$= 0.019 for 17882443). Moreover, VDR -4817G>A was significantly associated with protective effect on all fracture risk ($p_{recessive}$=0.035, OR=0.2, 95% CI=$0.05{\sim}0.89$), and tended to be higher BMD values at various proximal femur sites. Therefore, we suggest that the -4817G>A may be useful genetic marker for vitamin D-related metabolism and may have an important role in the increased BMD of the proximal femur in postmenopausal Korean women.