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Atomic layer deposition analysis of HfSiO4 by Mass Spectroscopy and XPS
Moo-Sung Kim,Steven A. Rogers,Ho-Kyu Kang,Jong-Ho Lee,Yun-Seok Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
In order to understand the ALD reaction of HfCl4 and (C4H9O)4Si (tetrabutyl orthosilicate, TBOS) for deposition of HfSiO4, in-situ gas analysis of the process chamber was performed by using mass spectroscopy. Due to the complexity of the mass spectral data, it was not possible to identify all of the byproducts of the ALD reaction. However, the results do indicate that the principal reaction pathways result in the formation of HCl, butylene, and other chloroalkanes. The major reaction channel is thought to be formation of butylene: HfCl4 + (C4H9O)4Si ! HfSiO4 + C4H8 + HCl. From the XPS measurement, lm with very low carbon and chlorine content could be obtained.
(Sang Ah Chang),(Bong Yun Cha),(Soon Jib Yoo),(Yo Bae Ahn),(Ki Ho Song),(Je Ho Han),(Jong Min Lee),(Hyun Sik Son),(Kun Ho Yoon),(Moo Il Kang),(Kwang Woo Lee),(Ho Young Son),(Sung Ku Kang) 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.2
N/A Background : It has been reported that many peripheral vasodilating drugs might improve insulin resistance. Cilostazol, a antithrombotic agent, increases peripheral blood flow in non-insulin dependent diabetic patients. The effect of cilostazol treatment on insulin resistance in streptozotocin (STZ)-induced non-insulin dependent diabetic Wistar rats was examined. Methods : About a half of two-day old neonate siblings were injected intraperitoneally with STZ and maintained for six months, at which time they were compared with age-matched control rats for intraperitoneal glucose tolerance test (IPGTT) and for glucose infusion rate (GINF) in a euglycemic hyperinsulinemic glucose-clamp study. After that, these studies were also performed after feeding rat chow containing cilostazol (100 mg/kg/day) to rats with STZ-induced non-insulin dependent diabetes mellitus for four-weeks and compared with those of age-matched control rats. Results : In the intraperitoneal glucose tolerance test studies, plasma glucose levels of STZ-induced non-insulin dependent diabetic rats were significantly higher and plasma insulin levels significantly lower than those of age-matched control rats in the age of six months. Glucose infusion rate was lower in STZ-induced non-insulin dependent diabetic rats than those of age-matched control rats. However, after a four-week cilostazol treatment, glucose infusion rate of STZ-induced non-insulin dependent diabetic rats was not significantly different from that of control rats. Conclusion : These findings suggested that cilostazol may improve insulin resistance in STZ-induced non-insulin dependent diabetic rats.
Sung Hoon Choi,Chang Moo Kang,Dong Hyun Kim,Woo Jung Lee,Hoon Sang Chi 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.81 No.5
Robotic surgical system provides many unique advantages which might compensate the limitations of usual laparoscopic surgery. By using robotic surgical system, we performed robot-assisted laparoscopic pancreaticoduodenectomy (PD). A Sixty-two year old female patient with an ampullary mass underwent robot assisted PD due to imcomplete treatment of endoscopic ampullectomy. The removal of specimen and reconstruction were performed through small upper midline skin incision. Robot working time was about 8 hours, and blood loss was about 800 ml without blood transfusion. She returned to an oral diet on postoperative day 3. Grade B pancreatic leak was noted during the postoperative period, but was successfully managed by conservative management alone. We successfully performed da Vinci-assisted laparoscopic PD, and robot surgical system provided three-dimensional stable visualization and wrist-like motion of instrument facilitated complex operative procedures. More experiences are necessary to address real role of robot in far advanced laparoscopic pancreatic surgery.
Sloshing suppression by floating baffle
Kang, Hooi-Siang,Md Arif, Ummul Ghafir,Kim, Kyung-Sung,Kim, Moo-Hyun,Liu, Yu-Jie,Lee, Kee-Quen,Wu, Yun-Ta Techno-Press 2019 Ocean systems engineering Vol.9 No.4
Sloshing is a phenomenon which may lead to dynamic stability and damages on the local structure of the tank. Hence, several anti-sloshing devices are introduced in order to reduce the impact pressure and free surface elevation of liquid. A fixed baffle is the most prevailing anti-sloshing mechanism compared to the other methods. However, the additional of the baffle as the internal structure of the LNG tank can lead to frequent damages in long-term usage as this structure absorbs the sloshing loads and thus increases the maintenance cost and downtime. In this paper, a novel type of floating baffle is proposed to suppress the sloshing effect in LNG tank without the need for reconstructing the tank. The sloshing phenomenon in a membrane type LNG tank model was excited under sway motion with 30% and 50% filling condition in the model test. A regular motion by a linear actuator was applied to the tank model at different amplitudes and constant period at 1.1 seconds. Three pressure sensors were installed on the tank wall to measure the impact pressure, and a high-speed camera was utilized to record the sloshing motion. The floater baffle was modeled on the basis of uniform-discretization of domain and tested based on parametric variations. Data of pressure sensors were collected for cases without- and with-floating baffle. The results indicated successful reduction of surface run-up and impulsive pressure by using a floating baffle. The findings are expected to bring significant impacts towards safer sea transportation of LNG.
Sung Hwan Lee,Chang Moo Kang,Yong Eun Chung,Jeong Youp Park,Woo Jung Lee 한국간담췌외과학회 2014 한국간담췌외과학회지 Vol.18 No.2
Postoperative pancreatic fistula (POPF) combined with postoperative fluid collection, bleeding and abscess formation is one of the most critical morbidities after distal pancreatectomy or pancreaticoduodenectomy. Percutaneous catheter drainage has been commonly used for managing for the postoperative management of abnormal fluid collection. Removal of the catheter is rarely associated with occurrence of life-threatening complication such as serious liver damage. Herein, we report a case of unexpected fatal liver injury complicated by percutaneous catheter drainage treatment after distal pancreatosplenectomy in a patient with pancreatic cancer. We suggest that prudent decision for timing of catheter removal and meticulous care during procedure can reduce the possibility of major liver injury in patients with percutaneous transhepatic catheter drainage.