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Ko You Keun,Lee Jong Kwon,Park Hye Kyung,Han Ae Kyung,Mun Sun Kyoung,Park Hye Jeong,Choung Hae Kyoung,Kim Se Mi,Choi Kwang Mo,Lee Nam Yong,Cho Duck,Kim Dae Won,강은숙 대한진단검사의학회 2023 Annals of Laboratory Medicine Vol.43 No.5
Background: Sterility and safety assurance of hematopoietic stem cell (HSC) products is critical in transplantation. Microbial contamination can lead to product disposal and increases the risk of unsuccessful clinical outcomes. Therefore, it is important to implement and maintain good practice guidelines and regulations for the HSC collection and processing unit in each hospital. We aimed to share our experiences and suggest strategies to improve the quality assurance of HSC processing. Methods: We retrospectively analyzed microbial culture results of 11,743 HSC products processed over a 25-year period (January 1996 to May 2021). Because of reorganization of the HSC management system in 2008, the 25-year period was divided into periods 1 (January 1996 to December 2007) and 2 (January 2008 to May 2021). We reviewed all culture results of the HSC products and stored aliquot samples and collected culture results for peripheral blood and catheter samples. Results: Of the 11,743 products in total, 35 (0.3%) were contaminated by microorganisms, including 19 (0.5%) of 3,861 products during period 1 and 16 (0.2%) of 7,882 products during period 2. Penicillium was the most commonly identified microorganism (15.8%) during period 1 and coagulase-negative Staphylococcus was the most commonly identified (31.3%) during period 2. HSC product contamination occurred most often during HSC collection and processing. Conclusions: The contamination rate decreased significantly during period 2, when the HSC management system was reorganized. Our results imply that handling HSC products by trained personnel and adopting established protocols, including quality assurance programs, aid in decreasing the contamination risk.
Ko, Kwang Il,Park, Kyoung Sook,Lee, Mi Jung,Doh, Fa Mee,Kim, Chan Ho,Koo, Hyang Mo,Oh, Hyung Jung,Park, Jung Tak,Han, Seung Hyeok,Kang, Shin-Wook,Yoo, Tae-Hyun S. Karger AG 2014 American journal of nephrology Vol.40 No.4
<P>Abstract</P><P><B><I>Background:</I></B> The aim of this study was to investigate the association between the dialysate MCP-1 (dMCP-1) and systemic inflammatory and nutritional markers in peritoneal dialysis (PD) patients. In addition, we examined the prognostic value of dMCP-1 on all-cause or cardiovascular mortality in these patients. <B><I>Methods:</I></B> We prospectively followed 169 prevalent PD patients from April 1st 2008 to December 31st 2012. At baseline, dMCP-1 and serum biochemical parameters including high sensitivity CRP (hs-CRP) and albumin were checked. All-cause mortality and cause of death were evaluated during the follow-up period. Based on the median level of dMCP-1, patients were classified as either low or high dMCP-1 groups. <B><I>Results:</I></B> Mean age, hs-CRP, and D/Pcr ratio at 4 h were significantly higher, while serum albumin levels and %lean body mass (LBM) were significantly lower in the high dMCP-1 group. During the mean follow-up period of 47.7 months, all-cause mortality and cardiovascular mortality rate were significantly higher in the high dMCP-1 group (9.6 and 6.3 per 100 person-years, respectively) compared to the low dMCP-1 group (5.1 and 3.1 per 100 person-years, respectively; p = 0.021, 0.038). In multivariate Cox analysis, high dMCP-1 was a significant independent predictor of all-cause mortality (hazard ratio: 1.83, 95% confidence interval: 1.03-3.24, p = 0.039). <B><I>Conclusions:</I></B> dMCP-1 levels are closely correlated with nutritional and systemic inflammatory markers in PD patients. In addition, increased dMCP-1 is significantly associated with higher all-cause and cardiovascular mortality. These findings suggest that local peritoneal inflammation could contribute to poor clinical outcomes in PD patients.</P><P>© 2014 S. Karger AG, Basel</P>
Flip-Chip Bonding of MEMS Scanner for Laser Display Using Electroplated AuSn Solder Bump
Kun-Mo Chu,Won-Kyoung Choi,Young-Chul Ko,Jin-Ho Lee,Hyo-Hoon Park,Duk Young Jeon IEEE 2007 IEEE TRANSACTIONS ON ADVANCED PACKAGING Vol.30 No.1
<P>A MEMS scanner has been flip-chip bonded by using electroplated AuSn solder bumps. The microelectromechanical systems (MEMS) scanner is mainly composed of two structures having vertical comb fingers. To optimize the bonding condition, the MEMS scanner was flip-chip bonded with various bonding temperatures. Scanning electron microscopy (SEM) with an energy dispersive X-ray (EDX) spectroscopic system was used to observe the microstructures of the joints and analyze the element compositions of them. The die shear strength increased as the bonding temperature increased. During the thermal aging test, the delamination occurred at the interconnection of the MEMS scanner bonded at 340 degC. It is inferred that the Au layer serving as pad metallization has been dissolved in the molten AuSn solder totally, and subsequently the Cr layer was directly exposed to the AuSn solder. Judging by the results of both die shear test and thermal aging test, the optimal bonding temperature was found to be approximately 320 degC. Finally, using this MEMS scanner, we obtained an optical scanning angle of 32deg when driven by the ac control voltage of the resonant frequency in the range of 22.1-24.5 kHz with the 100-V dc bias voltages</P>
우심방 전체를 침범한 진행성 간세포암종에서의 소라페닙 치료
강영모 ( Young Mo Kang ),류수형 ( Soo Hyung Ryu ),이보경 ( Bo Kyung Lee ),고경호 ( Kyoung Ho Ko ),박태영 ( Tae Young Park ),문정섭 ( Jeong Seop Moon ),조선화 ( Seon Hwa Cho ) 대한간암학회 2018 대한간암학회지 Vol.18 No.2
Advanced hepatocellular carcinoma (HCC) with tumor thrombus extending through the hepatic veins, inferior vena cava, and right atrium (RA) is very rare. However, whether active treatments such as radiation, transcatheter arterial chemoembolization, and sorafenib in advanced HCC with RA involvement prolong survival is uncertain. We present a rare case of advanced HCC with tumor thrombus nearly occupying the entire RA that was treated with sorafenib. The patient received 400 mg sorafenib twice daily. However, her liver enzyme levels continued to increase and abdominal computed tomography showed an increase in the tumor size in the liver and RA. In the present case, active treatment with sorafenib was ineffective; thus, palliative care may be more beneficial in advanced HCC with extensive RA involvement. (J Liver Cancer 2018;18:142-145)
The Effects of Spiral Taping Theraphy-A Randomisation Controlled Trial
Choi Sung-hun,Ko Kyoung-mo,Kim Kyung-woon,Lee Yoon-kyung,Lim Seong-chul,Jung Tae-young,Lee Kyung-min,Hwang Jae-wok,Seo Jung-chul 대한침구의학회 2006 대한침구의학회지 Vol.23 No.2
Objectives : This study was designed to estimate the effects of Spiral Taping theraphy on low back pain or neck pain patients by using pressure pain threshold, visual analogue scale(VAS), and range of motion(ROM).Methods : The patients were allocated into two groups by randomisation. Spiral Taping theraphy group consisted of 11 patients and acupuncture theraphy group consisted of 10 patients. The degree of improvement of neck pain was evaluated by pressure pain threshold, VAS, and ROM before treatment and after treatment. The patients were commonly treated with acupuncture theraphy. After acupuncture Spiral Taping theraphy was performed in Spiral Taping theraphy group.Results : Pressure pain threshold and VAS were significantly different between two groups. In Spiral Taping theraphy group the pressure pain threshold of the all points was significantly increased and VAS was significantly decreased than control group. But there was no significant difference between the two groups in ROM. Conclusion : The effectiveness of Spiral Taping theraphy on low back pain and neck pain patients was shown through pressure algometer and VAS. These imply that Spiral Taping theraphy may be useful for on low back pain or neck pain. Further study is needed about Spiral Taping theraphy.