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Jae‑Gil Jung,Young‑Hee Cho,Tae‑Young Ahn,Jae‑Hee Yoon,Sang‑Hwa Lee,Jung‑Moo Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
The correlation between primary Si and silicide refinement induced by ultrasonic treatment (UST) of multicomponent Al–Sialloy containing Ti, Zr, V, and P was investigated. UST significantly refined the primary Si phase owing to cavitation-inducedwetting and deagglomeration of MgAl2O4particles. Lowering the UST finish temperature caused deterioration of the degreeof primary Si refinement, instead leading to silicide refinement. Cavitation-induced silicide nucleation on wetted MgAl2O4consumed the MgAl2O4particles, particularly in the case of primary Si nucleation. Similarly, the formation of an AlP phaseon the silicide phase reduced the nucleation efficiency of the AlP phase. Poisoning of the MgAl2O4and AlP phases by thesilicide phase was responsible for the deterioration in primary Si refinement. Room-temperature tensile strength and hightemperatureelongation were increased by UST and were dependent on the size of primary Si.
Changes in Diagnostic Methods for Pulmonary Tuberculosis between 2005 and 2013
Ahn, Bin,Kim, Joohae,Yoo, Chul-Gyu,Kim, Young Whan,Han, Sung Koo,Yim, Jae-Joon The Korean Academy of Tuberculosis and Respiratory 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Background: Diagnostic methods for pulmonary tuberculosis (TB) have recently advanced. The aim of this study was to evaluate the changes in TB diagnostic tests that prompted the initiation of anti-TB treatment over time in South Korea, an industrialized country with an intermediate TB burden. Methods: Patients diagnosed with pulmonary TB in the first halves of 2005 and 2013 at a tertiary referral hospital were included. Diagnostic methods that prompted the initiation of anti-TB treatment were compared between the 2 groups of patients. Results: A greater proportion of patients were diagnosed with pulmonary TB using bronchoscopy in 2013 than in 2005 (26.7% vs. 6.6%, respectively; p<0.001), while the proportion of patients clinically diagnosed with pulmonary TB was lower in 2013 than in 2005 (24.7% vs. 49.0%, respectively; p<0.001). Additionally, more patients started anti-TB treatment based on positive polymerase chain reaction (PCR) results for Mycobacterium tuberculosis DNA in 2013 than in 2005 (47.3% vs. 7.9%, respectively; p<0.001). Conclusion: The initiation of treatment for pulmonary TB in South Korea has become more frequently based on PCR and the use of bronchoscopic specimens.
Sang-Hyun Han,Seung-Jae Hyun,Tae-Ahn Jahng,Ki-Jeong Kim 대한척추신경외과학회 2015 Neurospine Vol.12 No.2
Objective: This study aimed to investigate radiographic fusion rates at L4-5 and L5-S1 after single level posterior lumbar interbody fusion (PLIF) and evaluate the relationship between fusion rates and preoperative disc slope angle (DSA), lumbar lordosis (LL), segmental angle (SA), and pelvic parameters. Methods: We conducted a retrospective review of patients who underwent single level PLIF at L4-5 or L5-S1 during May 2003-December 2012 at our institution. 73 patients were finally enrolled. Fusion was assessed by use of the Brantigan-Steffee classification, less than 2mm translation and less than 5° motion on the flexion-extension lateral radiographs. We analyzed the radiographic fusion rates, risk factors, and relationship of fusion rates with DSA, LL, SA, and pelvic parameters. Results: There were 59 patients (80.8%) in the L4-5 group and 14 (19.2%) in L5-S1 (average follow-up, 34 months). The radiographic fusion rates were 89.8% in the L4-5 group (53/59) and 42.9% in L5-S1 (6/14) (p<0.001).The preoperative DSA was significantly lesser in the L4-5 group than in the L5-S1 group (13.1±8.1° vs. 27.2±6.7°, p<0.001). The LL, SA, and pelvic parameters were not related with radiographic fusion rates in both groups. Risk factors for non-union were not identified between the two groups except for the surgery level (p<0.001). Conclusion: The radiographic fusion rate at L5-S1 was less than half that at L4-5 after single level PLIF. This may be due to the anatomical and biomechanical differences between the two levels. More vigorous effort to achieve successful fusion at L5-S1 should be considered.
The Effect of Star Chef Image on Reputation, Familiarity, and Loyalty
Sung-Man Ahn(Sung-Man Ahn),Jae-Jang Yang(Jae-Jang Yang) People & Global Business Association 2024 Global Business and Finance Review Vol.29 No.4
Purpose: This paper explored the Star Chefs' images among customers who visit their restaurants in order to under-stand the effect of such images on familiarity, reputation, and loyalty. Design/methodology/approach: The study data were collected from the target customers of South Korean Star Chef restaurants. Representative South Korean Star Chefs appearing on South Korean TV programs who are running their own restaurants were contacted and told about the objective of this study. Of the nine Star Chefs contacted for cooperation, six Star Chef restaurants agreed to join this study. Findings: First, the Star Chef's image had a significant influence on familiarity and reputation. Second, the Star Chef's familiarity had a significant influence on reputation, and the Star Chef's familiarity had a significant influence on loyalty. Last, the Star Chef's reputation had a significant influence on loyalty. Research limitations/implications: This study is the image and reputation were examined by personifying the brand. This type of study could not include all the different human characteristics. Additionally, there are some difficulties in generalizing this study worldwide. Because there are only a few chefs that appear on TV programs in South Korea. Originality/value: The importance of service quality and environment has been highlighted in previous studies of restaurants, but studies of chefs who provide services are limited.
Ahn, Sejin,Son, Tae Hwa,Cho, Ara,Gwak, Jihye,Yun, Jae Ho,Shin, Keeshik,Ahn, Seoung Kyu,Park, Sang Hyun,Yoon, Kyunghoon Wiley-VCH 2012 CHEM SUS CHEM Vol.5 No.9
<P>A simple direct solution coating process for forming CuInSe??? (CIS) thin films was described, employing a low-cost and environmentally friendly precursor solution. The precursor solution was prepared by mixing metal acetates, ethanol, and ethanolamine. The facile formation of a precursor solution without the need to prefabricate nanoparticles enables a rapid and easy processing, and the high stability of the solution in air further ensures the precursor preparation and the film deposition in ambient conditions without a glove box. The thin film solar cell fabricated with the absorber film prepared by this route showed an initial conversion efficiency of as high as 7.72???%.</P>
An Insufficient Preoperative Diagnosis of Borrmann Type 4 Gastric Cancer in Spite of EMR
Ahn, Jae-Bong,Ha, Tae-Kyung,Lee, Hang-Rak,Kwon, Sung-Joon The Korean Gastric Cancer Association 2011 Journal of gastric cancer Vol.11 No.1
Borrmann type 4 gastric cancers are notorious for the difficulty of finding cancer cells in the biopsy samples obtained from gastrofiberscopy. It is important to obtain the biopsy results for making surgical decisions. In cases with Borrmann type 4 gastric cancer, even though the radiological findings (such as an upper gastrointestinal series, abdominal computed tomography and positron emission tomography/computed tomography) or the macroscopic findings of a gastrofiberscopy examination imply a high suspicion of cancer, there can be difficulty in getting the definite pathologic results despite multiple biopsies. In these cases, we have performed endoscopic mucosal resection under gastrofiberscopy as an alternative to simple biopsies. Here we report on a case in which no cancer cells were found even in the endoscopic mucosal resection specimen, but the radiologic evidence and clinical findings were highly suspicious for gastric cancer. The patient finally underwent total gastrectomy with lymph node resection, and she was pathologically diagnosed as having stage IV gastric cancer postoperatively.
Molecular mechanism of T-lymphocyte apoptosis caused by COPRISIN
Jae-Sam Hwang,Bo-Ram Kang,Eun-Young Yun,Seong-Ryul Kim,Sung-Hee Nam,Mi Young Ahn,Ho Kim,Jong-Soo Chang 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
COPRISIN is an antibiotic substance extracted from Copris tripartitus. This study is intended to identify various cell biological stimuli that COPRISIN, widely known as an antibacterial substance, has on human cells and to identify its molecule mechanism. A variety of human cell lines were divided into epithelial cells including kidney cells or womb cells, and immunocyte including T cells or macrophages and, after their being cultivated and maintained, cell biological changes of the respective cells according to COPRISIN treatment were compared. As a result, it was confirmed that, different from other experiment cells, COPRISIN specifically caused cell kill in T cells and macrophages. That is, fragmentation of DNA, typical characteristics observed in the process of apoptosis, was confirmed in the nucleus of cells dying owing to COPRISIN treatment. An Apoptosis process is one dependent upon activity of caspase family protein, it was proved that COPRISIN medium cell kill process was one through a caspase-independent route such as AIF. Though it was found out that transcription of TNF-α and extracellular TNF-α secretion increased in blood cells stimulated by COPRISIN, it was also confirmed that TNF-α was a major medium factor in a COPRISIN induced cell kill process from the fact that a cell kill process by COPRISIN was not inhibited at all with TNF-α inhibiting antibody treatment. Above results revealed that COPRISIN, different from other tissue origin cells including kidney cells, can specifically induce apoptosis in immunocyte, which is caused by a caspase-independent cell signal transmission route.
( Jae Won Yoon ),( Chung Hoon Kim ),( Joo Yuen Kim ),( Eun Jin Jeon ),( Jun Woo Ahn ),( Sung Hoon Kim ),( Hee Dong Chae ),( Byung Moon Kang ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.8
Transvaginal radiofrequncy myolysis is minimally invasive treatment by creating thermal energy in myoma and causing the necrosis of uterine fi broid cells. Unlike myomectomy which is considered to be the most common treatment of uterine myoma in infertile women, transvaginal radiofrequncy myolysis can be performed as outpatient procedure using only sedation for pain relief without additional need for medication. Due to its less invasive approach, the hospitalization is not required. There are many published studies reporting the pregnancy complications and outcomes after myomectomy, but there are very limited data on pregnancy after myolysis. Therefore, we present a case of successful pregnancy and childbirth after transvaginal radiofrequency myolysis of uterine myoma in an infertile women with a brief review of the literature.