Inertio-elastic flow instabilities in a 90° bent microchannel

Kim, Junghee,Hong, Sun Ok,Shim, Tae Soup,Kim, Ju Min The Royal Society of Chemistry 2017 SOFT MATTER Vol.13 No.34

<▼1><▼1><P>We report the novel inertio-elastic flow instability in dilute polymer solutions for a microchannel having a 90° bent geometry.</P></▼1><▼2><P>Biological samples having viscoelastic properties are frequently tested using microfluidic devices. In addition, viscoelastic fluids such as polymer solutions have been used as a suspending medium to spatially focus particles in microchannels. The occurrence of flow instability even at low Reynolds number is a unique property of viscoelastic fluids. In this study, we report the instability in viscoelastic flow for a channel having a 90° bent geometry, which is a characteristic of many microfluidic devices. Interestingly, we observed that the flow instability in aqueous poly(ethylene oxide) (PEO) solution occurs when the concentration of PEO is as low as 50 ppm. We systematically investigated the effects of the polymer concentration, flow rate, and elasticity number on the flow instability. The results show that the flow is stabilized in shear-thinning fluids, whereas the flow instability is amplified when both elastic and inertial effects are pronounced. We believe that this study is useful to design microfluidic devices such as cell-deformability measurement devices based on viscoelastic particle focusing.</P></▼2></▼1>

Twenty Years of Progress and the Way Forward: Immunization Registry Information System in Korea

Kim Junghee,Song Minju,Ahn Seohyeon,Kwon Seunghyun Lewis 대한의학회 2024 Journal of Korean medical science Vol.39 No.12

The National Immunization Program in The Republic of Korea offers mandatory and free vaccinations to children under 12, regulated by the Infectious Disease Prevention and Control Act. Tracking vaccination coverage is crucial for population protection and public health strategies. Since 2002, the Immunization Registry Information System (IRIS) has been used nationwide to capture vaccination data. This study reviewed documents related to IRIS’s establishment and development. The Republic of Korea legally supports IRIS's construction and data collection, integrating vaccination data with the Ministry of the Interior and Safety's resident registration to minimize errors. This collaboration also facilitates cost reimbursement and digital registration, promoting wider vaccination coverage. IRIS manages expense claims once vaccination details are logged, and authorized medical institutions can access these records in real-time. Since 2015, the Korea Disease Control and Prevention Agency has been compiling annual data on national vaccination coverage. IRIS also sends automated reminders in 12 languages, reports adverse effects, and issues vaccination certificates. However, IRIS lacks integration between vaccine and disease registries, unlike countries such as England, Denmark, and the Netherlands. Improving integration capabilities could enhance IRIS's support for public health through an integrated information system.

Enhanced fast ion prompt loss due to resonant magnetic perturbations in KSTAR

Kim, Kimin,Jhang, Hogun,Kim, Junghee,Rhee, T. American Institute of Physics 2018 Physics of plasmas Vol.25 No.12

Alteration of Mucin Glycosylation in Airway Diseases

Junghee Kang,Jinkuk Kim,Joo-Heon Yoon,Sookyung Hwang,Soohyun Kim 한국당과학회 2006 한국당과학회 학술대회 Vol.2006 No.1

Mishima Yukio’s Modern Noh Play Sotoba Komachi: Nietzsche’s Influence and the Ideal Post-war Artist

( Junghee Kim ) 성균관대학교 동아시아학술원 2018 Sungkyun Journal of East Asian Studies Vol.18 No.2

The medieval Noh 能 play Sotoba Komachi 卒塔婆小町 educates its audience about the Buddhist concept of ichinyokan 一如觀 by staging a series of conflicting concepts and then resolving them. Mishima Yukio’s 三島由紀夫 modern Noh play of the same name removes the Buddhist coloring from ichinyokan to depict a reversal of contradictory ideas. This reversal reveals Mishima’s artistic worldview that emerged from his personal experiences as a writer in a society devastated by defeat in war. Mishima’s perceptions of art and the artist were influenced by Nietzsche’s The Birth of Tragedy, especially the idea that art is the realization of conflict, but also contains complementary Dionysian and Apollonian elements; I argue that Mishima learned of dualism through the dualism of Nietzsche, and that after discovering this dualism in the original Sotoba Komachi, he exploited it in his modern version.

THE PATRONS OF GORYEO BUDDHIST PAINTING

( Kim Junghee ) 국립중앙박물관 2010 Journal of Korean Art and Archaeology (JKAA) Vol.4 No.0

Throughout the Goryeo period, when Buddhism was the official state religion, both the royal house and aristocrats frequently sponsored colossal projects for constructing lavish temples. Officials, both civil and military, local administrators and monks were also active patrons of Buddhist architecture and art, even if on a more modest scale. Currently, some 160 Buddhist paintings dated to the Goryeo period have survived. Thirty of these paintings carry dated inscriptions, and the patron is known for twenty-three of them. All of them were produced during the period when the Goryeo king and ruling class deferred to the Yuan. The paintings were commissioned by people of various classes and walks of life, from the royal house and influential military leaders to Buddhist monks, groups of faithful and individuals; they were intended to pray for the prosperity of the country and the welfare of its people, an end to a war, or as vehicles of more personal prayers for longevity and rebirth in paradise. This paper divides the patrons of Goryeo Buddhist paintings into four large categories: the royal house and government officials (civil and military officials and palace staff), monks, Buddhist groups and individuals. Concubine Sukbi, who commissioned the creation of Water-Moon Avalokiteshvara in 1310, for example, is among the best known of royal patrons of Buddhist paintings. Among government officials, Yeom Seung-ik, a member of the close entourage of King Chungnyeol (r. 1275-1308), the eunuch Seo Ji-man, Yi Yo-seom, a senior military official, and a certain Gwon Bok-su, who was actually either Gwon Dan (1228-1311) or Gwon Bu (1262-1346), stand out for their patronage activities. Among monk patrons, those who held the highest clerical positions include, daeseonsa (name unknown) and seungtong Johyeong (the head abbot of Jeongeopwon), both of whom commissioned Illustration of Amitayur-dyana Sutra in 1323. Hyeoncheol, who commissioned Illustration of the Sutra on the Descent of Maitreya in 1350 and the abbot of Anyangsa, the patron of the Amitabha with Eight Great Bodhisattvas in 1320 are also worth a mention. Goryeo Buddhist paintings, brilliantly-colored and using profuse amounts of gold powder, with meticulously depicted details, are generally believed to have been works commissioned by the royal house or aristocrats. This, however, was not always the case. Buddhist paintings were sometimes commissioned by individuals or small groups of devotees known as hyangdo. Examples of paintings sponsored by groups include the Rinsho-ji Illustration of Visualization Sutra (1323), the Hōon-ji Amitabha Triad (1330), and the Shinnō-in Illustration of the Sutra on the Descent of Maitreya (1350). Another Amitabha Triad (in Uesugi Jinja), dated to 1309, was, meanwhile, created under the patronage of a certain Seo family (Suhodang). This family is believed to be of the Seo clan of Icheon, a noble lineage whose most famous scion was Seo Hui (942-998), a scholar-official and diplomat of early Goryeo. The examination of literature providing circumstantial information on Goryeo Buddhist paintings revealed that people of various social classes participated in their patronage, ranging from the royal house, government officials (civil and military officials, palace staff) to monks, groups and individuals. This may be a result of the belief that constructing a temple, erecting a pagoda, hand-copying a Buddhist scripture or worshipping a Buddha statue contribute to ensuring good fortunes for oneself and one’s family. The trend toward seeking rewards in this world by transcribing sutras or commissioning Buddhist statues or paintings is, therefore, likely to explain the widespread patronage activities for Buddhist paintings in this period. Patrons of Buddhist paintings also included a new type of politically influential families known as gwonmunsejok (權門勢族) or gwonmunsega (權門勢家) which emerged in late Goryeo, replacing traditional old families that made up the ruling class in early Goryeo. The most active patrons of Buddhist paintings from this period, remain members of the Yeom clan of Seowon, best known for Yeom Seung-ik, and the Kim clan of Eonyang whose most famous member is Concubine Sukbi. The fact that Buddhist paintings were commissioned by people of widely-varying walks of classes from the royal house to ordinary individuals and religious groups, meanwhile, attests to a deep and far-reaching penetration of Buddhism in Goryeo society. The examination of literature providing circumstantial information on Goryeo Buddhist paintings revealed that people of various social classes participated in their patronage, ranging from the royal house, government officials (civil and military officials, palace staff) to monks, groups and individuals. This may be a result of the belief that constructing a temple, erecting a pagoda, hand-copying a Buddhist scripture or worshipping a Buddha statue contribute to ensuring good fortunes for oneself and one’s family. The trend toward seeking rewards in this world by transcribing sutras or commissioning Buddhist statues or paintings is, therefore, likely to explain the widespread patronage activities for Buddhist paintings in this period. Patrons of Buddhist paintings also included a new type of politically influential families known as gwonmunsejok (權門勢族) or gwonmunsega (權門勢家) which emerged in late Goryeo, replacing traditional old families that made up the ruling class in early Goryeo. The most active patrons of Buddhist paintings from this period, remain members of the Yeom clan of Seowon, best known for Yeom Seung-ik, and the Kim clan of Eonyang whose most famous member is Concubine Sukbi. The fact that Buddhist paintings were commissioned by people of widely-varying walks of classes from the royal house to ordinary individuals and religious groups, meanwhile, attests to a deep and far-reaching penetration of Buddhism in Goryeo society.

Shape Measurement of Ellipsoidal Particles in a Cross-Slot Microchannel Utilizing Viscoelastic Particle Focusing

Kim, Junghee,Kim, Jun Young,Kim, Younghun,Lee, Seong Jae,Kim, Ju Min American Chemical Society 2017 ANALYTICAL CHEMISTRY - Vol.89 No.17

<P>Shape measurement of nonspherical micro particles by conventional methods such as optical microscopy is challenging owing to particle aggregation or uncertainty regarding the out-of-plane arrangement of particles. In this work, we propose a facile microfluidic method to align particles in-plane utilizing the extensional flow field generated in a cross-slot microchannel. Viscoelastic particle focusing is also harnessed to move particles toward the stagnation point of the cross-slot microchannel. We demonstrate that the shapes of ellipsoidal particles with various aspect ratios can be successfully measured using our novel microfluidic method. This method is expected to be useful in a wide range of applications such as shape measurement of nonspherical cells.</P>

ENVIRONMENTAL POLLUTION MONITORING SYSTEM USING IR MOLECULAR SPECTROSCOPY

JungHee Kim 국제과학영재학회 2011 APEC Youth Scientist Journal Vol.3 No.-

Environmental pollution monitoring has been a very important concern in global community as the global environment goes from bad to worse by industrialization. In this paper, we suggest a technology applicable to real-time monitoring for gas-phase or liquid-phase contamination. This technique is based on IR molecular spectroscopy. We think that it is very effective in determining a wide variety of contamination materials in water purification including organic compounds harmful to the human body. In addition, we expect that this technique is also applicable to air-pollution detection.

Graphene quantum dots prevent α-synucleinopathy in Parkinson’s disease

Kim, Donghoon,Yoo, Je Min,Hwang, Heehong,Lee, Junghee,Lee, Su Hyun,Yun, Seung Pil,Park, Myung Jin,Lee, MinJun,Choi, Seulah,Kwon, Sang Ho,Lee, Saebom,Kwon, Seung-Hwan,Kim, Sangjune,Park, Yong Joo,Kinos Nature Publishing Group 2018 Nature nanotechnology Vol.13 No.9

Living Labs based Health Program for Healthy Aging: A Systematic Review

Junghee Kim 한국간호과학회 2023 한국간호과학회 학술대회 Vol.2023 No.11