팽창재 및 수축저감제 사용에 따른 고성능 콘크리트의 특성

문학룡,황인성,한천구 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2

This study is investigate the fundamental and shrinkage properties of high performance concrete of W/B 30% with using expansive additive and shrinkage reducing agent. According to the results, it is considered that fluidity and air content are hardly influenced and strength development well by using expansive additive and shrinkage reducing agent. As for the shrinkage properties, it shows the best efficient to reduce autogenous and drying shrinkage when combined use of expansive additive and shrinkage reducing agent which have different shrinkage reducing concept. There for, combined use of expansive additive and shrinkage reducing agent is efficient to reduce shrinkage in high performance concrete of W/B 30%.

콘크리트의 블리딩에 미치는 골재 조립률의 영향

文學龍,裵正烈,황인성,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This study is to investigate the influence of W/C and fineness modulus of aggregate on the bleeding of concrete. According to the result, the lower W/C is, the less bleeding occurs. As for the properties of bleeding with the variation of fineness modulus, the amount of bleeding is small with the continuous grading in the middle of the standard grading range in the case of coarse aggregate, and it grows smaller with a decrease of fineness modulus in the case of fine aggregate. Therefore, it proves that using coarse aggregate with the continuous grading in the middle of the standard grading range and fine aggregate with smaller fineness modulus in the standard grading range is the effective method for reducing bleeding at the same W/C.

콘크리트의 블리딩에 미치는 혼화재의 영향

황인성,文學龍,金光華,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This study is to investigate the influence of contents of mineral admixture on bleeding of concrete. According to the results, as W/B increases, bleeding occurs rapidly at early age regardless of replacement of mineral admixture, and when slump and air content are kept equal, the amount of bleeding decreases proportionately with an increase of replacing ratio of fly ash and blast furnace slag powder. Bleeding speed is highest at 60 minutes after placing concrete, and grow slower after 180 minutes. Bleeding speed also grows high with an increase of W/B, and is lower in the case of fly ash than in the case of blast furnace slag powder.

운반시간 지연에 의해 저하된 레미콘의 성능회복에 관한 기초적 연구

전충근,文學龍,황인성,양성환,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

In this paper, availability of deteriorated remicon due to delaying delivery time is discussed. According to test results, fluidity and air content of plain concrete exhibited a tendency to decline with a elapse of time. After 90 minutes since mixed, use of superplasticizer and AE admixture resulted in an increase in fluidity and air content. Adequate dosage of superplasticizer and AE adimixture is found to add with 0.4% and 0.002% respectively to restore the level of original slump and air content from loss one. Setting time of concrete exhibited an acceleration with an increase in leaving time of concrete. Compressive strength of plain concrete is enhanced with and increase of leaving time of concrete. Therefore, it is found that the use of superplasticizer with 0.4% and AE admixture with 0.002% has a desirable effect on restoring the deteriorated quality of concrete related to fluidity, air content and setting time without strength loss caused by delivery time delaying.

콘크리트의 블리딩에 미치는 시멘트 제조사 및 분말도의 영향

金恩浩,文學龍,황인성,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This study is to investigate the influence of the manufacturing company and fineness of cement on bleeding of concrete. According to the results, as fineness of comment increases, slump and air content of fresh concrete decrease, and setting time is shortened. The amount of bleeding abates with an increase of fineness, and it is confirmed that bleeding does not occur especially in the case of B8000. it is confirmed that bleeding does not occur. Bleeding speed is higher in the case of OPC A than in the case OPC B, and grows low with an increase of fineness. It also becomes highest at about 60 minutes, and shows slow tendency in W/C of 45% in comparison with W/C of 50%. And It is confirmed that relativity between fineness of cement and the final amount of bleeding is very favorable. As the properties of hardened concrete, compressive strength do not make much difference between OPC A and B is little, and increases with an increase of fineness.

Thorough Pre-Transplant Evaluation and Appropriate Case Selection Is the Mainstay for Better Survival in Recipients with Malignancy

( Wen Yao Yin ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1

Aims: Death from cardiovascular disease and infection are decreasing proper screening, prophylaxis, aggressive risk factor management, and interventional therapies. Cancer, on the other hand, is poorly screened both in recipient and donor to prevent post-transplant malignancy. Methods: We review the cases of liver and kidney transplant patients taken care in Dalin Tzu Chi General hospital in the past twelve years. We reviewed the issues on cancer before transplant, any cancer transmission from the donor, cancer after transplantation, outcomes of transplant recipients with cancer, and the role of screening and therapy in reducing the impact of cancer in transplant recipients. Results: There were 40 liver transplant and 46 kidney transplant patients with a total of 86 cases in this study. Sixteen cases (19.28 %) were associated with malignancy.A total of 16 cases (19.28%) died in this study. Among the kidney transplant patients, a total of 5 cases had malignancy: one renal cell carcinoma (RCC), three Transitional cell carcinoma (TCC) and one colon cancer. Two TCC cases were de novo malignancy.A case of TCC died of recurrence Among the liver transplant patients, 5 cases of living donor liver transplant (LDLT) and 4 cases of deceased donor liver transplant (DDLT) patients were associated with malignancy. No recurrence after follow up of 6 months to 8 years except a patient with an occult cecal cancer died one year after LDLT. Four cases of malignancy in DDLT: two HCC, one prostate cancer, and one nasopharyngeal cancer were noted. Both of the HCC patients died 3 months after DDLT and about 3 years after transplantation respectively. Conclusions: No significant difference in survival between cancer and non-cancer patients. We considered thorough preoperative screening is fundamental to prevent poor prognosis.

Recent Advances in Concrete Technology of Taiwan

Yin-Wen Chan 한국콘크리트학회 2002 한국콘크리트학회 학술대회 논문집 Vol.2002 No.11

Self‐assembly of covalent porphyrin compound and its enhanced electrochemiluminescence performance

Wen-Kai Zhu,Wen-Rong Cai,Zhen-Zhi Yin,Ming-Jie Cheng,Kong Yong 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.12

A novel Zn-coordination covalent porphyrin assembly (TCPP-BZA-Zn) is designed. The assembly structure is synthesized through the amidation reac- tion between the porphyrin terminal carboxyl group and the amino group of benzylamine (BZA), and further assembled through π–π stacking. In particular, the inherently ordered structure of TCPP-BZA-Zn with Zn as the catalytic active center endows the porphyrin assembly structure with several obvious advantages, such as high ion transport properties and high electrocatalytic per- formance. In the presence of hydrogen peroxide as a co-reaction reagent, TCPP-BZA-Zn/GCE showed excellent ECL behavior. The amplification phenome- non of ECL was further studied by cyclic voltammetry and the corresponding mechanism was proposed. Based on TCPP-BZA-Zn, an electrochemilumines- cence sensor was constructed for copper ion detection. The ECL intensity of the sensor shows a good linear relationship with the concentration of copper ion in the range of 10 nM–1 mM, and the detection limit is 1.3 nM.

Laparoscopic vs Open Distal Pancreatectomy: Technical Evaluation from Dalin Tzu Chi Experience

( Wen Yao Yin ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1

Aims: This study emphasized on the postoperative complications following resection solely on normal pancreatic tissue by laparoscopic technique or open method. Methods: We collected a total of 47 cases of cases who underwent distal pancreatectomy. The prospective group: 9 cases of laparoscopic distal pancreatectomy(LDP) and 13 cases of open distal pancreatectomy who were operated in recent 3 consecutive years, were compared with the other retrospective group of 25 cases operated before laparoscopic era. The postoperative mortality and morbidity were compared and statistically evaluated. Results: The overall complication between laparoscopic and open group was quite similar (6/9, 66.6% vs 14/38,,32.4%, p=0.142). However severe complications occurred higher in patients with open method in both groups (8/13 61.5% vs 3/9 33.3%, p=0.387) though no significant difference probably due to small number of cases. In contrast, patients in retrospective group (all open) showed surprisingly low severe complication (3/25, 12%). If we look at the severe complications in three subgroups (two laparoscopic and open in prospective group and one retrospective open group), a significant difference with p value 0.002 only between the two open groups (prospective open 69.2% vs retrospective open 3/25 12%, p=0.001). Regarding the transaction site, no difference seen between neck and tail but taken together with closure method, closure with TA (mostly at neck) was much better than GIA. Severe complication for LDP was lower than open group for soft pancreas with good p value (3/9 33.3% vs 8/11 72.7% p -0.07). Conclusions: Closure technique with TA55 resected at neck is a reliable technique. LDP was associated with early recovery with less overall complications. Fistula rate was comparable but less severe in LDP. Double Clamping technique (developed by our team) with slowly flattening method may be helpful for favorable outcome

Risk Factors for Early Recurrence of HBV-related Hepatocellular Carcinoma Meeting Milan Criteria after Curative Resection

Zhu, Wen-Jiang,Huang, Chu-Ying,Li, Chuan,Peng, Wei,Wen, Tian-Fu,Yan, Lv-Nan,Li, Bo,Wang, Wen-Tao,Xu, Ming-Qing,Yang, Jia-Yin,Jiang, Li Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

Background: The prognosis of patients with hepatocellular carcinoma (HCC) after curative resection varies greatly. Few studies had investigated the risk factors for early recurrence (recurrence-free time ${\leq}$ 1 year) of hepatitis B virus (HBV)-related HCCs meeting Milan criteria. Methods: A retrospective analysis was performed on the 224 patients with HCC meeting Milan criteria who underwent curative liver resection in our center between February 2007 and March 2012. The overall survival (OS) rate, recurrence-free survival (RFS) rate and risk factors for early recurrence were analyzed. Results: After a median follow-up of 33.3 months, HCC reoccurred in 105 of 224 patients and 32 died during the period. The 1-, 3- and 5-year OS rates were 97.3%, 81.6% and 75.6% respectively, and the 1-, 3- and 5-year RFS rates were 73.2%, 53.7% and 41.6%. Cox regression showed alpha-fetoprotein (AFP) > 800 ng/ml (HR 2.538, 95% CI 1.464-4.401, P=0.001), multiple tumors (HR 2.286, 95% CI 1.123-4.246, P=0.009) and microvascular invasion (HR 2.518, 95% CI 1.475-4.298, P=0.001) to be associated with early recurrence (recurrence-free time ${\leq}$ 1-year) of HCC meeting Milan criteria. Conclusions: AFP > 800 ng/ml, multiple tumors and microvascular invasion are independent risk factors affecting early postoperative recurrence of HCC. In addition resection appears capable of replacing liver transplantation in some situations with safety and a better outcome.