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Ferricyanide-Sensing Electrodes
Ihn, Gwon-Shik Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.1
The Ferricyanide-sensing electrodes were prepared with $Ag_2S\;and\;Ag_3Fe(CN)_6$ (mole ratio 3:1-7:1). The 5:1 $(Ag_2S:Ag_3Fe(CN)_6)$ composition is superior to others in terms of potentiometric response, rapidity of response and reproducibility. Testing was done over the concentration range $10^{-1}M{\sim}10^{-6}M\; Fe(CN)_6^{3-}$ at pH 6.8 with constant ionic strength. The concentration-potential curve was linear and coincided with the Nernstian slope (19.7 mV/decade). Interfering ions were $I^-,\;Br^-,\; SCN^-\;and\;Fe(CN)_6^{4-}$ and the life time of this electrode was 3 weeks. This electrode could be used as the indicator electrode for measuring the ferricyanide and ferrocyanide.
A GGQS- based hybrid algorithm for inter-cloud time-critical event dissemination
Ihn Han Bac 한국데이터정보과학회 2012 한국데이터정보과학회지 Vol.23 No.6
Cloud computing has rapidly become a new infrastructure for organizations to re-duce their capital cost in IT investment and to develop planetary-scale distributed applications. One of the fundamental challenges in geographically distributed clouds is to provide efficient algorithms for supporting inter-cloud data management and dissem-ination. In this paper, we propose a geographic group quorum system (GGQS)-based hybrid algorithm for improving the interoperability of inter-cloud in time-critical event dissemination service, such as computing policy updating, message sharing,event no-tification and so forth. The proposed algorithm first organizes these distributed clouds into a geographic group quorum overlay to support a constant event dissemination latency. Then it uses a hybrid protocol that combines geographic group-based broad-cast with quorum-based multicast. Our numerical results show that the GGQS-based hybrid algorithm improves the efficiency as compared with Chord-based, Plume and GQS-based algorithms.
Design and evaluation of a GQS-based time-critical event dissemination for distributed clouds
Ihn Han Bae 한국데이터정보과학회 2011 한국데이터정보과학회지 Vol.22 No.5
Cloud computing provides computation, software, data access, and storage services that do not require end-user knowledge of the physical location and con guration of the system that delivers the services. Cloud computing providers have setup several data centers at di erent geographical locations over the Internet in order to optimally serve needs of their customers around the world. One of the fundamental challenges in geographically distributed clouds is to provide efficient algorithms for supporting intercloud data management and dissemination. In this paper, we propose a group quorum system (GQS)-based dissemination for improving the interoperability of inter- cloud in time-critical event dissemination service, such as computing policy updating, message sharing, event noti cation and so forth. The proposed GQS-based method or-ganizes these distributed clouds into a group quorum ring overlay to support a constant event dissemination latency. Our numerical results show that the GQS-based method improves the efficiency as compared with Chord-based and Plume methods.
Ihn, Kyong,Hyung, Woo Jin,Kim, Hyoung-Il,An, Ji Yeong,Kim, Jong Won,Cheong, Jae-Ho,Yoon, Dong Sup,Choi, Seung Ho,Noh, Sung Hoon The Korean Gastric Cancer Association 2012 Journal of gastric cancer Vol.12 No.4
Purpose: To evaluate the technical feasibility and oncologic safety, we assessed the short-term and long-term outcomes of laparoscopic resection of the small bowel gastrointestinal stromal tumors smaller than 5 cm by comparing those of open surgery by subgroup analysis based on tumor size. Materials and Methods: From November 1993 to January 2011, 41 laparoscopic resections were performed among the 95 patients who underwent resection of small intestine ${\leq}10$ cm in diameter. The clinicopathologic features, perioperative outcomes, recurrences and survival of these patients were reviewed. Results: The postoperative morbidity rates were comparable between the 2 groups. Laparoscopic surgery group showed significantly shorter operative time (P=0.004) and duration of postoperative hospital stay (P<0.001) than open surgery group and it was more apparent in the smaller tumor size group. There were no difference in 5-year survival for the laparoscopic surgery versus open surgery groups (P=0.163), and in 5-year recurrence-free survival (P=0.262). The subgroup analysis by 5 cm in tumor size also shows no remarkable differences in 5-year survival and recurrence-free survival. Conclusions: Laparoscopic resection for small bowel gastrointestinal stromal tumors of size less than 10 cm has favorable short-term postoperative outcomes, while achieving comparable oncologic results compared with open surgery. Thus, laparoscopic approach can be recommended as a treatment modality for patients with small bowel gastrointestinal stromal tumors less than 10 cm in diameter.
Ihn, Yon Kwon,Kim, Myeong Jin,Shin, Yong Sam,Kim, Bum-Soo The Korean Neurosurgical Society 2012 Journal of Korean neurosurgical society Vol.52 No.5
The authors present a case of isolated dural arteriovenous fistula (DAVF) in the transverse sinus, which developed six years after microvascular decompression caused by hemifacial spasm via suboccipital craniectomy. The lesion was successfully treated by transarterial embolization using Onyx. We reviewed the related radiologic and therapeutic features of DAVF involving an isolated sinus and described the feasibility of the use of Onyx.