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Yoo, Changhee,Do, Hyun-Ah,Jeong, In Gab,Park, Hongzoo,Hwang, Jung-Jin,Hong, Jun Hyuk,Cho, Jin Seon,Choo, Myong-Soo,Ahn, Hanjong,Kim, Choung-Soo The Korean Academy of Medical Sciences 2010 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.25 No.9
<P>Dendritic cells (DCs) are potent antigen-presenting cells. OK432 (Picibanil®) was introduced as a potent stimulator of DC maturation in combination with prostaglandin-E<SUB>2</SUB> and interferon-α. We compared the efficacy of a DC-prostate cancer vaccine using early-mature DCs stimulated with OK432, PGE2 and INF-α (OPA) with that of vaccines using other methods. On days 3 or 7 of DC culture, TNF-α (T), TNF-α and LPS (TL) or OPA were employed as maturation stimulators. DU145 cells subjected to heat stress were hybridized with mature DCs using polyethyleneglycol. T cells were sensitized by the hybrids, and their proliferative and cytokine secretion activities and cytotoxicity were measured. The yields of early-mature DCs were higher, compared to yields at the conventional maturation time (<I>P</I><0.05). In the early maturation setting, the mean fusion ratios, calculated from the fraction of dual-positive cells, were 13.3%, 18.6%, and 39.9%, respectively (<I>P</I>=0.051) in the T only, TL, and OPA-treated groups. The function of cytotoxic T cells, which were sensitized with the hybrids containing DCs matured early with OPA, was superior to that using other methods. The antitumor effects of DC-DU145 hybrids generated with DCs subjected to early maturation with the OPA may be superior to that of the hybrids using conventional maturation methods.</P>
Yoo, Changhee,Oh, Cheol Young,Cho, Jin Seon,Song, Cheryn,Seo, Seong Il,Ahn, Hanjong,Hwang, Tae-Kon,Cheon, Jun,Lee, Kang Hyun,Kwon, Tae Gyun,Jung, Tae Young,Chung, Moon Kee,Lee, Sang Eun,Lee, Hyun Moo The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.4
<P>We investigated the clinical significance of large difference (≥ 2 points) between biopsy-derived (bGS) and post-prostatectomy Gleason scores (pGS). At 14 medical centers in Korea, 1,582 men who underwent radical prostatectomy for prostate cancer were included. According to the difference between bGS and pGS, the patients were divided into three groups: A (decreased in pGS ≥ 2, n = 30), B (changed in pGS ≤ 1, n = 1,361; control group), and C (increased in pGS ≥ 2, n = 55). We evaluated various clinicopathological factors of prostate cancer and hazards for biochemical failure. Group A showed significantly higher mean maximal percentage of cancer in the positive cores (max%) and pathological T stage than control. In group C, the number of biopsy core was significantly smaller, however, tumor volume and max% were significantly higher and more positive biopsy cores were presented than control. Worse pathological stage and more margin-positive were observed in group A and C than in control. Hazard ratio for biochemical failure was also higher in group A and C (<I>P</I> = 0.001). However, the groups were not independent factors in multivariate analysis. In conclusion, large difference between bGS and pGS shows poor prognosis even in the decreased group. However it is not an independent prognostic factor for biochemical failure.</P>
유창희(Changhee Yoo) 대한비뇨기종양학회 2014 대한비뇨기종양학회지 Vol.12 No.3
To improve detection rate of prostate cancer in prostate biopsy, it is important to select proper location and the number of biopsy cores. In many previous studies, various biopsy schemes have been suggested to increase biopsy efficacy. However, the most widely used current biopsy scheme still has some limitations, so that further studies are needed. Currently, 12-14 core extended biopsy has been proved to be more efficacious than standard 6 core biopsy as initial biopsy scheme. For more meticulous re-biopsy, clinically important locations which were not included in initial biopsy, such as anterior fibromuscular zone or transition zone, should be covered as well as enough number of biopsy cores. Image guided prostate biopsy considered to be helpful for improving diagnosis efficacy. However, it needs more clinical experience to be popular.
Changhee Han,Sungyoon Song,Yeuntae Yoo,Jaehyeong Lee,Gilsoo Jang,Minhan Yoon 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the future, Distribution network will face many challenges due to increased acceptance of renewable resources such as photovoltaic (PV) and wind power. Typical problems that arise from increased penetration of renewable resources include overvoltage issues, load imbalances on each feeder, and fluctuations in power output. In this paper, we consider installing Soft-Open Points (SOPs) to solve these problems. SOP is a power electronic device installed at the normally-open point (NOP) of the distribution network. Typically, SOPs are comprised of voltage source converters (VSCs), which can control the power flow between the feeders. In this paper, we discuss the method of calculating the optimal operating point of a SOP using the Particle-Swarm Optimization (PSO) algorithm using the characteristics of the SOP that can independently control the active and reactive power flows. The IEEE-33 bus test system was modified to verify the proposed method and the objective function for the bus voltage deviation and the index for the total line losses can be minimized simultaneously by using the PSO algorithm to optimize the multiple objective function Algorithm.