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Kyu-Hwa Hur,Kuenyoul Park,John Jeongseok Yang,Mi-Na Kim,Heungsup Sung 대한임상검사정도관리협회 2020 Journal of Laboratory Medicine And Quality Assuran Vol.42 No.4
Laboratory preparedness and rapid expansion of testing capacity are essential for controlling the coronavirus disease 2019 (COVID-19) outbreak. Such efforts require the prompt implementation of authorized emergencyuse test kits and extensive and decentralized screening by qualified clinical laboratories. Until August 2020, 113 clinical laboratories in South Korea were approved to perform molecular tests of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) based on five proficiency testing evaluations conducted by the Korean Association of External Quality Assessment Service. SARS-CoV-2-positive clinical samples or reference materials are key elements for the development, validation, and verification of the SARS-CoV-2 molecular diagnostics. The developed reference materials have a wide range of applications, and they are available as nationwide/international external quality assessment (EQA) materials as well as day-to-day internal quality control materials. This review discusses the current status of the nationwide/ international EQAs and development of SARS-CoV-2 reference materials.
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허남진,조규상,이준희,서병국,강경화,최종욱 中央醫學社 1983 中央醫學 Vol.45 No.3
The postoperative maxillary retention cyst is a relatively uncommon disease, which usually develops slowly from pathological mucosal remnant in the antrum after Caldwell-Luc's operation. Its main manifestations are tender swelling on cheek, buccal sulcus, and toothache. We experienced 21 cases of postoperative maxillary cyst for recent 7 years. In this study, the clinical manifestations and operation findings were investigated, and histological analysis were performed in detail.
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Kyung-Hwa Han,Muhammad Ibrahim,Yong-Seon Zhang,Kang-Ho Jung,Hee-Rae Cho,Seung-Oh Hur,Yeon-Kyu Sonn 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.2
This study was carried out to investigate the effects of profile disturbance with different artificial accumulation history on physico-chemical properties of soil under plastic film house. The investigations included soil profile description using soil column cylinder auger F10cm x h110cm, in situ and laboratory measurements of soil properties at five sites each at the cucumber (Site Ic ~ Vc) and grape (Site Ig ~ Vg) plastic film houses with artificial soil accumulation. The sites except sites Ic, IVc, IVg and Vg, belong to ex-paddy area. The types of accumulates around root zone included sandy loam soil for 3 sites, loam soil for 1 site, saprolite for 2 sites, and multi-layer with different accumulates for 3 sites. Especially, Site IIg has mixed plow zone (Ap horizon) with original soil and saprolite, whereas disturbed soil layers of the other sites are composed of only external accumulates. The soil depth disturbed by artificial accumulation ranged from 20 cm, for Site IIg, to whole measured depth of 110 cm, for Site IVc, Vc, and Site IVg. Elapsed time from artificially accumulation to investigation time ranged from 3 months, Site IIc, to more than 20 years, Site Vg, paddy-soil covering over well-drained upland soil during land leveling in 1980s. Disturbed top layer in all sites except Site Vg had no structure, indicating low structural stability. In situ infiltration rate had no correlation with texture or organic matter content, but highest value with highest variability in Site IIIc, the shortest elapsed time since sandy loam soil accumulation. Relatively low infiltration rate was observed in sites accumulated by saprolite with coarse texture, presumably because its low structural stability in the way of weathering process could result in relatively high compaction in agro-machine work or irrigation. In all cucumber sites, there were water-transport limited zone with very low permeable or impermeability within 50 cm under soil surface, but Site IIg, IIIg, and Vg, with relatively weak disturbance or structured soil, were the reverse. We observed the big change in texture and re-increase of organic matter content, available phosphate, and exchangeable cations between disturbed layer and original soil layer. This study, therefore, suggest that the accumulation of coarse material such as saprolite for cultivating cash crop under plastic film house might not improve soil drainage and structural stability, inversely showing weaker disturbance of original soil profile with higher drainage.
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Notes on bird species newly recorded in Korea
Kim, Hwa-Jung,Kim, Dong-Won,Hur, Wee-Haeng,Jang, Byoungsoon,Lee, Yun-Kyung,Kwon, In-Ki,Park, Jong-Hyun,Park, Jong-Gil,Kang, Chang-Wan,Kim, Eun-Mi,Choi, Soon-Kyoo,Kim, Han-Kyu The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4
A total of 527 species of birds have been recorded in Korea. We summarize the records of three genera and six species that have been newly reported in Korea, discovered through the avian monitoring programs carried out by The National Institute of Biological Resources from 2013 to 2016. These six newly recorded species are; Ring-necked Duck (Aythya collaris), Lesser Scaup (Aythya affinis), Bufflehead (Bucephala albeola), Black-winged Kite (Elanus caeruleus), Mongolian Lark (Melanocorypha mongolica) and Crested Myna (Acridotheres cristatellus). One Ring-necked Duck was observed on March 23, 2014 in Jungrangcheon Stream. One male Lesser Scaup was recorded on February 24, 2014 in Gyeongpoho Lagoon. A male bufflehead was first seen in Yeongrangho Lagoon on January 26, 2013. The Black-winged Kite was first observed on January 23, 2013 at the Gangseo Wetland Ecological Park. One Mongolian Lark was also recorded on May 11, 2016 and May 12, 2017 in Marado Island. The Crested Myna was first observed on April 20, 2016 in Seomando, Island.
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Gallbladder paraganglioma with hemorrhage: A case report and literature review
Sang Hwa Song,Chol Kyoon Cho,Eun Kyu Park,Hee Joon Kim,Young Hoe Hur,Yang Seok Koh,Yun Ho Lee 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.4
Gallbladder paraganglioma (GP) is a rare tumor, with only 12 cases reported in the literature to date. Due to its rarity, clinical information of GP is insufficient. We present a case of GP in a 48-year-old female along with a literature review of all GP cases described to date. A 48-year-old female presented with intermittent right upper abdominal pain. Preoperative imaging revealed a hematoma in the gallbladder lumen without any definite etiology. Laparoscopic cholecystectomy was performed. Gross examination of the gallbladder revealed multiple small stones and a large hematoma as well as a 1.6-cm-sized polypoid mass at the gallbladder fundus. Microscopic study of the polypoid mass showed a zellballen appearance. Immunohistochemical analysis revealed that the mass was positive for synaptophysin, CD56, and chromogranin, suggesting GP. GP is difficult to diagnose because of non-specific clinical findings. Almost all GP cases are diagnosed based on histologic findings after cholecystectomy. Simple cholecystectomy was performed as a treatment in all reported cases of GP, including our case. There was no postoperative tumor recurrence or metastasis after surgery.
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Facile solid-state synthesis of oxidation-resistant metal nanoparticles at ambient conditions
Lee, Kyu Hyung,Jung, Hyuk Joon,Lee, Ju Hee,Kim, Kyungtae,Lee, Byeongno,Nam, Dohyun,Kim, Chung Man,Jung, Myung-Hwa,Hur, Nam Hwi Elsevier 2018 SOLID STATE SCIENCES Vol.79 No.-
<P><B>Abstract</B></P> <P>A simple and scalable method for the synthesis of metal nanoparticles in the solid-state was developed, which can produce nanoparticles in the absence of solvents. Nanoparticles of coinage metals were synthesized by grinding solid hydrazine and the metal precursors in their acetates and oxides at 25 °C. The silver and gold acetates converted completely within 6 min into Ag and Au nanoparticles, respectively, while complete conversion of the copper acetate to the Cu sub-micrometer particles took about 2 h. Metal oxide precursors were also converted into metal nanoparticles by grinding alone. The resulting particles exhibit distinctive crystalline lattice fringes, indicating the formation of highly crystalline phases. The Cu sub-micrometer particles are better resistant to oxidation and exhibit higher conductivity compared to conventional Cu nanoparticles. This solid-state method was also applied for the synthesis of platinum group metals and intermetallic Cu<SUB>3</SUB>Au, which can be further extended to synthesize other metal nanoparticles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple and scalable method for the synthesis of metal nanoparticles in the solid state was developed. </LI> <LI> Nanoparticles of coinage and platinum group metals were synthesized from solid hydrazine and corresponding metal precursors. </LI> <LI> The Cunanoparticles are better resistant to oxidation and exhibit higher conductivity compared to conventional Cu ones. </LI> <LI> This solid-state method was successfully applied for the synthesis of intermetallic Cu<SUB>3</SUB>Au nanoparticles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Metal nanoparticles were synthesized in the solid-state by grinding solid hydrazine with metal precursors at ambient temperature. This facile method is easily scalable without the need for large reaction vessels.</P> <P>[DISPLAY OMISSION]</P>
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Sang Hwa Song,Hee Joon Kim,Eun Kyu Park,Young Hoe Hur,Yang Seok Koh,Chol Kyoon Cho 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.1
Backgrounds/Aims: The purpose of this study is to demonstrate that laparoscopic distal pancreatectomy in benign disease is is safer and more favorable to patients than open distal pancreatectomy. Methods: We retrospectively reviewed data of 150 patients who underwent laparoscopic (n=69) or open (=81) distal pancreatectomy at a double institutes from 2008 to 2018. We reviewed each patient’s history for age, sex, pathologic diagnosis. Specific outcomes that were included hospital stay, operative time (in minutes), operative blood loss (in milliliters), 30-daymajormorbidity and mortality (Clavian-Dindo classification), pancreatic leak rate (grade of leak A, B, or C), pancreatic hemorrhage. Results: From 2008 to 2018, there were 150 patients underwent distal pancreatectomy with or without splenectomy for benign pancreatic disease. 81 patients underwent open and 69 patients underwent laparoscopic distal pancreatectomy (LDP) Intra-operative estimated blood loss was significantly lower in the LDP group than in the OPD group (200 vs. 400 ml p<0.01). There was no difference in blood transfusion between the two groups. There was a significant difference in the resection method between the two groups (p<0.01) and there was a significant difference in the use of mesh for prevention of postoperative pancreatic fistula (POPF) (53 vs. 34 p<0.01). There was no significant difference in incidence of POPF (15.9% in LDP vs 7.4% in ODP, p=0.235) between the two groups, morbidity rate between the two groups (18 vs. 30 p=0.152), post - pancreatectomy hemorrhage, wound infection, hospital stay and readmission. Conclusions: LDP showed there was no difference in the occurrence of POPF, complication and hospital stay. In contrast, intra-operative blood loss was significantly lower in the LDP group than in the ODP group, and LDP was also significantly better in the view point of the feeding advance. In other words, LDP is safer and more favorable to patients than ODP.
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Pancreatic metastasis from papillary thyroid cancer: a case report and literature review
Song Sang Hwa,Hur Young Hoe,Cho Chol Kyoon,Koh Yang Seok,Park Eun Kyu,Kim Hee Joon,Shin Sang Hoon,Yu Sung Yeol,Oh Chae Yung 대한종양외과학회 2023 Korean Journal of Clinical Oncology Vol.19 No.1
Pancreatic metastasis from papillary thyroid cancer (PTC) is extremely rare; only 18 cases have been reported in the literature. However, several reviews have highlighted similar characteristics between metastatic and primary pancreatic tumors. The patient was a 51-year-old male with a history of total thyroidectomy, modified radical neck dissection, and radioactive iodine ablation for PTC in 2014. Nodules suspected of metastasis were found in both lungs on chest computed tomography (CT). However, after 6 months, a follow-up chest CT showed no increase in size; thus, a follow-up observation was planned. Six years after his initial diagnosis, abdominal CT and pancreas magnetic resonance imaging revealed a 4.7 cm cystic mass with a 2.5 cm enhancing mural nodule in the pancreas tail. We diagnosed the pancreatic lesion as either metastatic cancer or primary pancreas cancer. The patient underwent distal pancreato-splenectomy. After surgery, the pathological report revealed that the mass was metastatic PTC. Pancreatic metastasis from PTC indicates an advanced tumor stage and poor prognosis. However, pancreatectomy can increase the survival rate when the lesion is completely resectable. Therefore, surgical resection should be considered as a treatment for pancreatic metastasis from PTC.
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