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유지홍,박진택,김정구,정란 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.8
The correlation between sensor output and corrosion rate of reinforcing steel was evaluated by laboratory electrochemical tests in saturated Ca(OH)_(2) solution with 3.5wt.% NaCl. In this paper, two types of electrochemical probes were developed: galvanic cells containing of steel/copper and steel/stainless steel couples. The corrosion behavior in saturated Ca(OH)_(2) solution with or without 3.5 wt% NaCl addition for the different electrodes was investigated by potentiodynamic test. Weight loss measurement and galvanic corrosion test were conducted to obtain the corrosion rate of reinforcing steel and the charge of sensor in saturated Ca(OH)_(2) solution with 3.5 wt.% NaCl addition, respectively. The results of the potentiodynamic test indicated the possibility of detecting an ingress point of chlorides by measuring the galvanic current. In galvanic corrosion tests, the galvanic current of steel/copper couple was higher than that of steel-stainless steel couple, i.e., the steel/copper sensor is more suitable for high resistance environment. The steel/stainless sensor showed a better linear correlation than the steel/copper sensor. Through the relationship between the sensor system output and the weight loss of steel, real corrosion damage of the steel embedded in concrete can be detected.
플라이 애쉬가 콘크리트 구조물의 철근 부식에 미치는 영향
박진택,유지홍,김정구,이재호,이광명 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.4
Addition of fly ash has beneficial effects on some mechanical properties of concrete, as well as the corrosion process induced by the chloride ion. The aim of this study was to investigate the effect of fly ash on the steel corrosion in concrete with various water-to-binder ratios. The corrosion process of steel bars embedded in concrete without fly ash and with 20% fly ash was tested under complete immersion, in 3.5 wt.% NaCl solution. Monitoring of open-circuit potential and linear polarization method and electrochemical impedance spectroscopy(EIS) were used to follow the corrosion process. Also, ASTM C1202 test method was used to estimate the concrete's resistivity of chloride penetration in concrete. The results obtained from electrochemical tests show that the use of fly ash has led to the improvement of corrosion resistance. Partial cement replacement by fly ash caused significant pore refinement, reduced permeability to chloride ions, and increased corrosion resistance.
유색미에 관한 연구 : Ⅲ. 유색미 유망계통에 대한 주요 생육 특성
김광수,최윤표,김선택,최현구,정종태,김보경,유지홍,이희봉 충남대학교 농업과학연구소 2007 농업과학연구 Vol.34 No.2
국내외 유색미 수집종을 돌연변이원에 의해 유기된 우수 계통과 수집종간 상호교배에 의해 선발된 CNU 20계통을 파종하여 얻어진 주요 작물학적 특성을 살펴보면 다음과 같다. 1. 간장은 유색 메벼인 CNU126 계통이 대조품종인 동진벼와 같이 가장 컸고 메성인 CNU 128계통에서 가장 작았다. 2. 주당 분얼수는 CNU3, CNU50. CNU56, CNU112 계통에서 가장 많았고 대조품종과 CNU 128 계통에서 10개 미만으로 가장 적게 나타났다. 3. 수장은 육성 계통 중 CNU88 계통에서 가장 길었으나 대조구보다 짧고, 육성계통 중에서는 CNU 126 계통이 가장 짧았다. 4. 주당 영화수는 대조구인 동진벼보다 CNU50 계통에서 2배 이상 많았고, CNU158 계통에서 가장 적게 나타났다. 5. 천립중은 CNU113 계통에서 30g이상으로 대조구와 같이 가장 무거웠고, CNU128 계통에서 20g으로 가장 적었다. 6. 주당 수량은 대조구의 26.6g에 비해 CNU50, CNU112 계통에서 두배정도 높았고, CNU128, CNU158, CNU200 계통에서 가장 낮게 타나났다. Aims of this study were carried out to develop the useful lines induced from mutation and pedigree breeding methods among the collected genetic resources from national and domestic areas. In this study, Stem height of CNU126 line and check among them were high, while CNU128 was lower than other lines. Spiklet length of CNU88 was longer, but that of CNU126 was shorter than check. Number of spiklets per plant of CNU50 among lines have twice time than check. 1,000 grains weight of CNU113 was higher than check. In yield per plant, CNU50 and CNU112 were higher than check, Dongjinbyeo.
Case of concurrent Riedel’s thyroiditis, acute suppurative thyroiditis, and micropapillary carcinoma
Ji Taek Hong,이정환,김소헌,홍성빈,남문석,김용성,주영채 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.2
Riedel’s thyroiditis (RT) is a rare chronic inf lammatory disease of the thyroid gland. It is characterized by a fibroinflammatory process that partially destroys the gland and extends into adjacent neck structures. Its clinical manifestation can mask an accompanying thyroid neoplasm and can mimic invasive thyroid carcinoma. Therefore, diagnosis can be difficult prior to surgical removal of the thyroid, and histopathologic examination of the thyroid is necessary for a definite diagnosis. The concurrent presence of RT and other thyroid diseases has been reported. However, to our knowledge, the association of RT with acute suppurative thyroiditis and micropapillary carcinoma has not been reported. We report a rare case of concurrent RT, acute suppurative thyroiditis, and micropapillary carcinoma in a 48-year-old patient.
Ji Taek Hong,Min-Jung Lee,Sang Jun Yoon,Seok Pyo Shin,Chang Seok Bang,Gwang Ho Baik,Dong Joon Kim,Gi Soo Youn,Min Jea Shin,Young Lim Ham,Ki Tae Suk,Bong-Soo Kim 고려인삼학회 2021 Journal of Ginseng Research Vol.45 No.2
Background: Korea Red Ginseng (KRG) has been used as remedies with hepato-protective effects in liver-related condition. Microbiota related gut-liver axis plays key roles in the pathogenesis of chronic liver disease. We evaluated the effect of KRG on gut-liver axis in patients with nonalcoholic statohepatitis by the modulation of gut-microbiota. Methods: A total of 94 patients (KRG: 45 and placebo: 49) were prospectively randomized to receive KRG (2,000 ㎎/day, ginsenoside Rg1þRb1þRg3 4.5㎎/g) or placebo during 30 days. Liver function test, cytokeraton 18, and fatigue score were measured. Gut microbiota was analyzed by MiSeq systems based on 16S rRNA genes. Results: In KRG group, the mean levels (before vs. after) of aspartate aminotransferase (53 ± 19 vs. 45 ± 23 IU/L), alanine aminotransferase (75 ± 40 vs. 64 ± 39 IU/L) and fatigue score (33 ± 13 vs. 26 ± 13) were improved (p < 0.05). In placebo group, only fatigue score (34 ± 13 vs. 31 ± 15) was ameliorated (p < 0.05). The changes of phyla were not statistically significant on both groups. In KRG group, increased abundance of Lactobacillus was related with improved alanine aminotransferase level and increased abundance of Clostridium and Intestinibacter was associated with no improvement after KRG supplementation. In placebo group, increased abundance of Lachnospiraceae could be related with aggravation of liver enzyme (p < 0.05). Conclusion: KRG effectively improved liver enzymes and fatigue score by modulating gut-microbiota in patients with fatty liver disease. Further studies are needed to understand the mechanism of improvement of nonalcoholic steatohepatitis.
Long-term Prognosis of Localized Lymphoid Hyperplasia of the Rectum
( Ji Taek Hong ),( Eun Ran Kim ),( Sung-wook Park ),( Ji Won Kim ),( Sung Noh Hong ),( Dong Kyung Chang ),( Young-ho Kim ),( Jun Hun Cho ) 대한소화기학회 2021 Gut and Liver Vol.15 No.1
Background/Aims: Although localized lymphoid hyperplasia (LLH) of the rectum is occasionally observed, its clinical implications are unclear. This study aimed to investigate the clinical course and significance of LLH of the rectum. Methods: We identified 65 patients diagnosed with LLH of the rectum using a histopathologic examination and who received follow-up endoscopies between January 2009 and June 2015. Patients with a history of inflammatory bowel disease, lymphoma, familial adenomatous polyposis, or uncontrolled malignancy and patients who underwent scar biopsy after endoscopic resection or surgery were excluded. Endoscopic findings and clinical courses were analyzed. Results: During the median follow-up of 31 months (interquartile range, 19 to 40 months), 81.5% (53/65) of LLHs of the rectum were resolved. Clinically significant diseases, including ulcerative colitis (UC, n=5) and mucosa-associated lymphoid tissue (MALT) lymphoma (n=1), were diagnosed in 9.2% of patients (6/65). The other six patients showed no significant changes in the lesion (n=3) or a waxing and waning appearance (n=3). According to endoscopic findings, all of the 47 polypoid types showed resolution or waxing and waning patterns. Five of the 11 nodular types (45.5%) developed into UC. One of the seven submucosal tumor (SMT)-like types (14.3%) developed into MALT lymphoma. Conclusions: LLH of the rectum with persistent symptoms or the endoscopic appearance of the nodular or SMT-like type may lead to clinically significant disease. Risk stratification according to endoscopic findings and careful surveillance are required for these lesions. (Gut Liver 2021;15:77-84)
Oh, Taek-In,Lee, Yoon-Mi,Nam, Taek-Jin,Ko, Young-San,Mah, Shinmee,Kim, Jinhee,Kim, Younghoon,Reddy, Rallabandi Harikrishna,Kim, Young Jun,Hong, Sungwoo,Lim, Ji-Hong MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.10
<P>Fascaplysin has been reported to exert anti-cancer effects by inhibiting cyclin-dependent kinase 4 (CDK4); however, the precise mode of action by which fascaplysin suppresses tumor growth is not clear. Here, we found that fascaplysin has stronger anti-cancer effects than other CDK4 inhibitors, including PD0332991 and LY2835219, on lung cancer cells that are wild-type or null for retinoblastoma (RB), indicating that unknown target molecules might be involved in the inhibition of tumor growth by fascaplysin. Fascaplysin treatment significantly decreased tumor angiogenesis and increased cleaved-caspase-3 in xenografted tumor tissues. In addition, survivin and HIF-1α were downregulated in vitro and in vivo by suppressing 4EBP1-p70S6K1 axis-mediated de novo protein synthesis. Kinase screening assays and drug-protein docking simulation studies demonstrated that fascaplysin strongly inhibited vascular endothelial growth factor receptor 2 (VEGFR2) and tropomyosin-related kinase A (TRKA) via DFG-out non-competitive inhibition. Overall, these results suggest that fascaplysin inhibits TRKA and VEGFR2 and downregulates survivin and HIF-1α, resulting in suppression of tumor growth. Fascaplysin, therefore, represents a potential therapeutic approach for the treatment of multiple types of solid cancer.</P>
개인 휴대 단말기를 위한 실시간 음성 전송 시스템 설계 및 구현
김지홍 ( Ji-hong Kim ),유정택 ( Jeong-taek Ryu ),허혜선 ( Hye-sun Hur ),이용일 ( Yong-il Lee ),홍윤식 ( Youn-sik Hong ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
본 논문은 무선 랜 카드를 장착하여 무선 인터넷 연결이 가능한 개인 휴대 단말기를 사용하는 실시간 음성 전송 시스템(RTVTS)을 설계 구현하였다. RTVTS 시스템은 VoIP 기술 중 SIP 시그널링 프로토콜을 사용하여 호 제어를 수행한다. RTVTS 의 서버는 멀티 스레드 기능을 사용하여 여러 대의 클라이언트 접속이 가능하고, 클라이언트 간에는 UDP 프로토콜을 사용하여 실시간 음성 전송이 수행되며, 또한 현재 온라인이 아닌 클라이언트에게 음성 메시지를 남길 수 있는 녹음 기능을 갖고 있다.
홍지택 ( Ji Taek Hong ),정석 ( Seok Jeong ),이돈행 ( Don Haeng Lee ),김성현 ( Seong Hyun Kim ),민상준 ( Sang Joon Min ),정현정 ( Hyun Jung Chung ),전용선 ( Yong Sun Jeon ) 대한내과학회 2012 대한내과학회지 Vol.83 No.4
Emphysematous infections of the abdomen are potentially life-threatening conditions that require aggressive medical and surgical management. Emphysematous pancreatitis is an uncommon disease that presents as acute pancreatitis with intra-parenchymal gas at the time of diagnosis. Traditionally, emphysematous pancreatitis is an indication for surgical intervention. However, a few cases of emphysematous pancreatitis, managed successfully without surgical debridement have been reported. We present a case of emphysematous pancreatitis managed medically without surgical debridement in a 56-year-old male. (Korean J Med 2012;83:485-489)