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Finite Element Analysis on Formability of Parabolic Shape
포물선형상의 성형성에 관한 유한요소해석

Sang-Won Chung, Kyung-Won Lee
2012 Journal of the korean society of manufacturing technology engineers  
For the product with small diameter, long column, and parabolic shape, the forging formability of the high-carbon steel wire rod was investigated in this study. By using the three-dimensional finite element method, the formability of wire was reviewed by forming analysis for the desired parabolic shape of local part. Analysis results due to forging direction, forging velocity, friction coefficient and constraint location were also investigated. On the basis of these results, it is noted that
more » ... it is noted that the forging direction has the big influence when the product with long column is forged. As the forging velocity increases, buckling tends to be limited and formability of parabolic shape is improved. By constraining the lower parabolic shape part to suppress plastic strain, the effect depending on friction coefficient is not almost appeared. And good parabolic shape is obtained at the region of the forging velocity of more than 0.5 m/s.
doi:10.7735/ksmte.2012.21.4.677 fatcat:v3jp4l4gv5hgnfzejamrhclgfu

The Management of Thyroid Disease in COVID-19 Pandemic

Won Sang Yoo, Hyun-Kyung Chung
2020 International Journal of Thyroidology  
좀 더 자세히 살펴보면, 코로나바이러스의 감염은 바이러스가 ACE2 발현 세포 로 유입된 이후에 항바이러스 인터페론 반응을 약화시 Won Sang Yoo and Hyun-Kyung Chung www.ijthyroid.org 67 키면서 증식을 시작한다.  ...  Orcid Won Sang Yoo: https://orcid.org/0000-0002-2314-4184 Hyun-Kyung Chung: https://orcid.org/0000-0001-5580-5808 해 지금까지 알려진 임상 특징이나 침투경로에 대한 정 보와, COVID-19와 유사한 바이러스로 2002년 유행했던 severe acute respiratory  ... 
doi:10.11106/ijt.2020.13.2.65 fatcat:4pf73rh36rga5n3wchottzhlky

Effects of the mathematics integrated career education on students' affective characteristics
수학교과 통합 진로교육이 학생들의 정의적 특성에 미치는 효과

Hea Jin Chung, Won Kyung Kim
2015 The Mathematical Education  
doi:10.7468/mathedu.2015.54.2.167 fatcat:g7awo3eiqjfcdkusluimyphleu

Recent Advances in Autoimmune Thyroid Diseases

Won Sang Yoo, Hyun Kyung Chung
2016 Endocrinology and Metabolism  
Autoimmune thyroid disease (AITD) includes hyperthyroid Graves disease, hypothyroid autoimmune thyroiditis, and subtle subclinical thyroid dysfunctions. AITD is caused by interactions between genetic and environmental predisposing factors and results in autoimmune deterioration. Data on polymorphisms in the AITD susceptibility genes, related environmental factors, and dysregulation of autoimmune processes have accumulated over time. Over the last decade, there has been progress in the clinical
more » ... ss in the clinical field of AITD with respect to the available diagnostic and therapeutic methods as well as clinical consensus. The updated clinical guidelines allow practitioners to identify the most reasonable and current approaches for proper management. In this review, we focus on recent advances in understanding the genetic and environmental pathogenic mechanisms underlying AITD and introduce the updated set of clinical guidelines for AITD management. We also discuss other aspects of the disease such as management of subclinical thyroid dysfunction, use of levothyroxine plus levotriiodothyronine in the treatment of autoimmune hypothyroidism, risk assessment of long-standing antithyroid drug therapy in recurrent Graves' hyperthyroidism, and future research needs. It has been known that there are polymorphisms in the AITDrelated genes for quite some time. Among these genes, polymorphisms in the thyroid-stimulating hormone receptor (TSHR) gene contribute to susceptibility to GD [2]. Recently, a specific single-nucleotide polymorphism (SNP) in the TSHR gene relat-
doi:10.3803/enm.2016.31.3.379 pmid:27586448 pmcid:PMC5053048 fatcat:bgrr4426bnaa5eagk3dhzgtvzu

Study on the Design of Butyl Rubber Compound and Noise Reduction System for Sound Insulation
소음 차단 성능 향상을 위한 부틸 탄성체 배합 및 진동제어 시스템 디자인 연구

Won-Taek Kim, Kyung-Ho Chung
2014 Elastomers and Composites  
요 약:최근 공동주택의 층간 소음으로 인하여 사회적 문제가 크게 대두되고 있다. 본 연구에서는 소음 차단 성능을 향상시키기 위해 바닥 진동 제어 시스템에 적용되어질 방진고무를 제조하였다. 다양한 유형의 고무 중 우수한 노화특 성, 낮은 반발탄성 및 높은 댐핑특성의 성질은 갖는 부틸 고무를 방진고무의 원료 고무로 선정하였다. 그리고 부틸 컴파운드에 첨가되는 카본블랙의 유형과 함량에 따른 방진고무의 물성을 확인하였다. 표면적이 큰 카본블랙을 사용하 거나 함량이 증가할수록 고무와 카본블랙간의 결합고무의 함량이 증가하여 높은 기계적 물성, 낮은 반발탄성과 높은 댐핑특성을 나타내었다. 연구 결과를 토대로 최적의 카본블랙 종류와 함량을 결정하고 방진고무를 제조한 뒤 바닥 진동제어 시스템에 적용하였다. 바닥충격음을 측정한 결과 경량충격음 40 dB, 중량충격음 43 dB을 나타내어 소음 차단 성능이 우수한 것을 확인할 수 있었다. ABSTRACT:The noise between floors
more » ... se between floors of apartment has been hot issue nowadays. In order to improve the noise insulation performance, we proposed the antivibration rubber system which can be applied to the floor system for sound insulation. Among various types of elastomer, butyl rubber showed the good aging characteristic, low rebound resilience and high damping factor. Thus, the butyl rubber was selected as a basic rubber for antivibration rubber system. The effects of type and loading amounts of carbon black on antivibration properties of butyl rubber were studied. The increase of surface area and the content of carbon black resulted in high bound rubber fraction, high mechanical property, low rebound resilience, and high damping factor of butyl rubber. Based on the results of this study, the new antivibration rubber was prepared and applied to the floor system for sound insulation. The impact sounds of floor system proposed in this study were 40 dB and 43 dB in cases of light weight and heavy weight impact sound, respectively.
doi:10.7473/ec.2014.49.2.95 fatcat:2d5q7jqpffcmxirii5hv36f4l4

Subclinical Hypothyroidism: Prevalence, Health Impact, and Treatment Landscape

Won Sang Yoo, Hyun Kyung Chung
2021 Endocrinology and Metabolism  
ORCID Won Sang Yoo https://orcid.org/0000-0002-2314-4184 Hyun Kyung Chung https://orcid.org/0000-0001-5580-5808 Table 1 . 1 Prevalence of Subclinical Hypothyroidism Year Country Age, yr TSH threshold  ... 
doi:10.3803/enm.2021.1066 pmid:34139799 fatcat:jct7v4fnq5hdtl7pdlyuatkvzq

Dietary Zinc Deficiency Alters 5α-Reduction and Aromatization of Testosterone and Androgen and Estrogen Receptors in Rat Liver

Ae-Son OM, Kyung-Won Chung
1996 Journal of Nutrition  
Hepatic aromatization of androgens to estrogens is enhanced by castration, alcohol ingestion, and cocaine administration (Chung 1990 ).  ...  -3H-testosterone (specific radioactivity = 1.59 TBq/mmol, NEN Re search Products, Boston, MA) as substrate for l h at 37°C (Chung 1990 ).  ... 
doi:10.1093/jn/126.4.842 pmid:8613886 fatcat:ky5gwp7gbzf6ljb3ntggtt37ga

Two Cases of Graves' Disease Presented with Atypical Symptoms

Won Sang Yoo, Hyun Kyung Chung
2016 International Journal of Thyroidology  
Won Sang Yoo and Hyun Kyung Chung Vol. 9, No. 2, 2016 178 갑상선기능항진증에서 신장 및 요로계 증상은 특이 한 것이 없으며, 신장기능 이상이나 전해질 및 체액 불 균형이 초래되는 경우도 드물다.  ... 
doi:10.11106/ijt.2016.9.2.174 fatcat:xls7ctk5yjejpjifvgbnaqyxwq

Expression ofmembrane type-2and-3 matrix metalloproteinasesin eutopic endometrium of women with advanced endometriosis

Hyun Kyung Chung, Ji Young Lee, Kyung A Jeong, Hye Won Chung
2011 Korean Journal of Obstetrics & Gynecology  
One corresponding set of primers for MT2-MMP Hyun Kyung Chung, et al.  ... 
doi:10.5468/kjog.2011.54.8.441 fatcat:g35epr5nmff3fjzd5hmqruditm

Design Parameter Identification Using Transfer Function of Liquid Column Vibration Absorber (LCVA)
전달함수를 이용한 LCVA의 설계변수 분석

Sung-Kyung Lee, Kyung-Won Min, Hee-San Chung
2009 Journal of the Earthquake Engineering Society of Korea  
>> The purpose of this study is to verify the transfer function of input acceleration and output control force by linearizing a velocity-dependent damping term of Liquid Column Vibration Absorber (LCVA). Analytical and experimental research is conducted to identify natural frequency, damping ratio and participated mass ratio of LCVA with various section ratios of vertical and horizontal areas. Findings obtained experimentally by the shaking table test are compared with analytical findings using
more » ... ical findings using optimization technique with constraints. The results indicate that the level of liquid and section ratio of LCVA affect the characteristics of damping ratio and mass ratio. Damping and mass ratio increase as the section of vertical column of LCVA decreases, due to turbulence in the elbow of LCVA.
doi:10.5000/eesk.2009.13.4.047 fatcat:iijsj6ntandxxdzjatdlqqdpee

The effects of physical activity and sedentary time on the prevalence rate of metabolic syndrome and perceived stress in Korean adults

Woo-Kyung Kim, Won-Chung Chung, Deuk-Ja Oh
2019 Journal of Exercise Rehabilitation  
This study examined adult health related factors of the Korea National Health and Nutrition Examination Survey in 2017. Metabolic syndrome prevalence and perceived stress with physical activity and sedentary time were analyzed. Subjects are 4,459 over 40 year adults. The data were analyzed odds ratio (OR) and confidence interval by logistic regression analysis. First, male, moderate intensity occupational physical activity (OPA) and high intensity leisure time physical activity (LTPA) (OR,
more » ... ty (LTPA) (OR, 1.337) between metabolic syndrome prevalence tended to increase. Vigorous intensity OPA (OR, 0.847), transport physical activity (TPA) (OR, 0.968), and moderate intensity LTPA (OR, 0.927) between metabolic syndrome prevalence tends to decrease. Female, vigorous intensity OPA (OR, 1.238) between metabolic syndrome prevalence tended to increase. Moderate intensity OPA (OR, 0.878), TPA (OR, 0.875), vigorous intensity LTPA (OR, 0.691), and moderate intensity LTPA (OR, 0.479) between metabolic syndrome prevalence tended to decrease. Male, vigorous intensity OPA (OR, 1.584), moderate intensity OPA (OR, 1.752), and vigorous intensity LTPA (OR, 1.316) between perceived stress tended to increase. TPA (OR, 0.753) and moderate intensity LTPA (OR, 0.983) between perceived stress tended to decrease. Female, moderate intensity OPA (OR, 2.331) between perceived stress tended to increase. Vigorous intensity OPA (OR, 0.732), TPA (OR, 0.836), vigorous intensity LTPA (OR, 0.990), and moderate intensity LTPA (OR, 0.837) between perceived stress tended to decrease.
doi:10.12965/jer.1836552.276 pmid:30899734 pmcid:PMC6416495 fatcat:dfndguehbje2vgnaf6xor6dwua

The relationship between body shape perception and health behaviors among Korean normal-weight adolescents using Korea Youth Risk Behavior Web-Based Survey

Woo-Kyung Kim, Won-Chung Chung, Deuk-Ja Oh
2019 Journal of Exercise Rehabilitation  
Inappropriate adolescent health behavior can be influenced by the negative impact of physical and mental health promotion. Obesity influences subjective improper weight perception. This study aimed to verify Korean normal-weight adolescents' subjective experience of weight control, mental health, physical activity, and subjective status based on their body mass index (BMI). As a result, efforts to control weight appeared less in normal-weight boys. Thin girls were less likely to carry out 60
more » ... to carry out 60 min of physical activity 7 or 5 days per a week. Obese boys were less likely to carry out vigorous physical activity 3 days per a week. Normal-weight girls were less likely to practice muscular strength training 3 days per a week. Thin boys and thing girls were less likely to practice regular physical activity, and less likely to practice at the rate stipulated in the sedentary behavior guideline. In conclusion, boys and girls with inappropriate weight perception reported feeling stressed and depressed, and reported subjective sleep fulfillment, perceived subjective happiness, and perceived subjective health.
doi:10.12965/jer.1938535.266 pmid:31938701 pmcid:PMC6944877 fatcat:j73jeu3h4ngthblpbifdarkcmq

Effects of Intellectual Capital on Organizational Performance of Nurses in Medium and Small Hospitals

Won-Kyung Kim, Hyang-In Cho Chung
2012 Journal of Korean Academy of Nursing Administration  
예를 들면, 중소병원 간호사의 조직몰입 정도가 높을수록 직무만족과 전문직 자아개념도 좋아지고(Kim & Chung, 2008) 이직을 고려하지 않게 된다는 것이다.  ...  12-384 month) <3-5 55 22.8 <5-8 51 21.2 ≥8 62 25.7 Career in present hospital (yr) <3 99 41.1 52.12±35.64 (Range: 12-192 month) <3-5 72 29.9 ≥5 70 29.0 Salary per year (10,000 won  ... 
doi:10.11111/jkana.2012.18.4.452 fatcat:v577dmxzkvep3mgppeiirs246q

Replication of Interactions between Genome-Wide Genetic Variants and Body Mass Index in Fasting Glucose and Insulin Levels

Kyung-Won Hong, Myungguen Chung, Seong Beom Cho
2014 Genomics & Informatics  
The genetic regulation of glucose and insulin levels might be modified by adiposity. With regard to the genetic factors that are altered by adiposity, a large meta-analysis on the interactions between genetic variants and body mass index with regard to fasting glucose and insulin levels was reported by the Meta-Analyses of Glucose-and Insulin-related trait Consortium (MAGIC), based on European ancestry. Because no replication study has been performed in other ethnic groups, we first examined
more » ... e first examined the link between reported single-nucleotide polymorphisms (SNPs) and fasting glucose and insulin levels in a large Korean cohort (Korean Genome and Epidemiology Study cohort [KoGES], n = 5,814). The MAGIC study reported 7 novel SNPs for fasting glucose levels and 6 novel SNPs for fasting insulin levels. In this study, we attempted to replicate the association of 5 SNPs with fasting glucose levels and 5 SNPs with fasting insulin levels. One SNP (rs2293941) in PDX1 was identified as a significant obesity-modifiable factor in Koreans. Our results indicate that the novel loci that were identified by MAGIC are poorly replicated in other ethnic groups, although we do not know why.
doi:10.5808/gi.2014.12.4.236 pmid:25705164 pmcid:PMC4330260 fatcat:md6h2ytoybecdfwmi4ggqim2a4

Current Practice of Design Promotion Activities And Its Influential Factors

JongMin Park, Kyung-Won Chung, Ki-Young Nam
2020 Zenodo  
Based on the proposed typology, Park & Chung (2007) also identified 3 key activities of the each type.  ...  Park & Chung, 2007 Design promotion may include all relevant activities of helping any client, private and public, to achieve their goals in through design.  ... 
doi:10.5281/zenodo.3855092 fatcat:2gcwjm3sa5hnzmvkh7ykwkpsqi
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