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저온 고체산화물 연료전지용 공기극 미세구조 제어 및 성능개선
강중구,김진수,윤성필,Kang, Jung-Koo,Kim, Jin-Soo,Yoon, Sung-Pil 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.12
In order to fabricate a highly performing cathode for low-temperature type solid oxide fuel cells working at below $700^{\circ}C$, electrode microstructure control and electrode polarization measurement were performed with an electronic conductor, $La_{0.8}Sr_{0.2}MnO_3$ (LSM) and a mixed conductor, $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$(LSCF). For both cathode materials, when $Sm_{0.2}Ce_{0.8}O_2$ (SDC) buffer layer was formed between the cathode and yttria-stabilized zirconia (YSZ) electrolyte, interfacial reaction products were effectively prevented at the high temperature of cathode sintering and the electrode polarization was also reduced. Moreover, cathode polarization was greatly reduced by applying the SDC sol-gel coating on the cathode pore surface, which can increase triple phase boundary from the electrolyte interface to the electrode surface. For the LSCF cathode with the SDC buffer layer and modified by the SDC sol-gel coating on the cathode pore surface, the cathode resistance was as low as 0.11 ${\Omega}{\cdot}cm^2$ measured at $700^{\circ}C$ in air atmosphere.
강중구,백도명,이윤정,마효일,손미아,이홍기,최정근,Kang, Joong-Koo,Paek, Do-Myung,Lee, Young-Jung,Ma, Hyeo-Il,Son, Mi-A,Lee, Hong-Ki,Choi, Jung-Keun 대한예방의학회 1996 Journal of Preventive Medicine and Public Health Vol.29 No.3
The objectives of this study are to investigate the prevalence of occupation related carpal tunnel syndrome(CTS) among workers in a condom industry : to analyse the sensitivity and specificity of clinical signs or symptoms such as hand diagram, Tinel's sign and Phalen's sign in carpal tunnel syndrome : and to test vibration threshold test using audiometry as a technically easy and noninvasive method in the diagnosis of carpal tunnel syndrome in stead of nerve conduction velocity (NCV). The study group was divided into exposed group(39 cases) and non-exposed group(48 cases) based on whether or not excessive use of wrist movements exsist. 1. There are stastically significant differences in symptoms and signs of carpal tunnel syndrome such as hand diagram, Tinel's sign and Phalen's sign between exposed and non-exposed group(p<0.05). 2. Six cases(9 hands) were comfirmed as carpal tunnel syndrome by NCV. Five cases(7 hands) belonged to exposed group, 1 case(2 hands) to nonexposed group. As there are significant differences in prevalence of carpal tunnel syndrome between two groups(p<0.05), excessive use of wrist in occupation is a risk factor of carpal tunnel syndrome. 3. When we use NCV as a gold standard in the diagnosis of carpal tunnel syndrome, sensitivity and specificity of hand diagram, Tinel's sign and Phalen's sign is as followed; hand diagram , sensitivity 88.9%, specificity 84.2% Tinel's sign ; sensitivity 55.6%, specificity 72.8% Phalen's sign ; sensitivity 14.3%, specificity 88.4%. Among above clinical signs and symptoms, hand diagram is the best clinical screening test. 4. The differences of vibration threshold between median and ulnar nerve at the same time are useful in the diagnosis of carpal tunnel syndrome but the time change of vibration threshold of median nerve over time are not sensitive enough. It is concluded that vibration threshold between median and ulnar nerve at the same time can be used as a supplementary or alternative criterion to indicate that the nerve dysfunction is located in the carpal tunnel.
황의호(Eui Ho Hwang),강중구(Jung Koo Kang) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.2
The incidence of the colon cancer in children is very low. The clinical manifestations of this disease are so vague and nonspecific that difficulty and delay in diagnosis are inevitable. A case of adenocarcinoma of the colon was experienced in 12 years-old boy, who was treated with transverse colectomy and chemotherapy with 5-FU and cis-platinum. The follow-up was conducted with serum CEA level and barium enema. At the 1 year after operartion, he is doing well without evidence of disease.
김경식(Kyung Sik Kim),김병로(Byong Ro Kim),강중구(Jung Koo Kang),이우정(Woo Jung Lee),홍인철(In Chul Hong) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.4
N/A Background/Aims: The role of laparoscopy in the treatment of appendicitis has evolved gradually. This study is to identify the significance of laparascopic surgery in the diagnosis and treatment of suspected appendicitis. Methods: From February 1993 to June 1995, we retrospectively reviewed 114 clinical cases of laparoscopic surgery in suspected appendicitis. Twelve cases were proven to have unsuspected findings. This study includes the false positive ratio, distribution of sex and age, operative findings, methods of operation, and postoperative course. Results: The false pasitive ratio is 10.5%. Pelvic inflammatory disease is most the common(4 cases) of the operative findings in false positive cases. The other cases are cecal diverticulitis, acute choleeystitis, omental torsion, bleeding hepatoma, spontaneous bacterial petitonitis, benign ovarian tumor, and vitelline duct remnant. There was no convasion to open laparotomy. All cases with unsuspected findings during laparoscopic appendectomy could have been dane by laparoscopic surgery. There was no surgically related mortality. In complications, there were two cases of seroma on the port site and one case of post-operative bleeding. Conclusions: We conclude that the laparoseopic approach in the operation of suspected appendicitis, especially in women of childbearing age, can be useful in the detection of lesians and is regarded as an effective method in diagnosis and treatment. (Korean J Gastroenterol 1997; 29: 482-488)