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Recurrence predictor of gastric cancer after surgery followed by adjuvant chemotheraphy
( Joon Jin ),( Ji Yun Hong ),( Jun Eul Hwang ),( Min Jee Kim ),( Hyun Jeong Shim ),( Sang Hee Cho ),( Ik Joo Chung ) 대한내과학회 2013 대한내과학회 추계학술발표논문집 Vol.2013 No.1
Background: Recent trials demonstrated that the adjuvant chemotherapy for stage II or III gastric cancer after curative D2 gastrectomy is effective for preventing recurrence. The objective of this study was to clarify the risk factors for recurrence in patients who received adjuvant chemotherapy after curative D2 gastrectomy. Patients and methods: We retrospectively analyzed the factors predicting recurrence in 206 patients with stage II or III gastric cancer who received S-1 chemotherapy or 5-FU and cisplatin (FP) chemotherapy following curative D2 gastrectomy between April 2004 and December 2011. Results: The median follow-up time after surgery was 2.93 years. A total of 136 patients received FP chemotherapy, and 70 patients received TS-1. 3 year recurrence-free survival was 66.7%. Univariate analysis demonstrated that gastroesophageal junction cancer, stage III, T3/T4 tumor, N2/N3 nodal status, presence of both lymphovascular invasion (LVI) and perineural invasion (PNI) was associated with shorter recurrence-free survival. Moreover, Multivariate analysis showed male (HR 1.909; 95% CI 1.067-3.417; p=0.029), stage III (HR 3.884; 95% CI 1.741-8.662; p=0.001), presence of both LVI and PNI (HR 2.293; 95% CI 1.367-3.846; p=0.002) was an independent risk factor for recurrence. Conclusion: Presence of both LVI and PNI is a strong recurrence predictor of recurrence-free survival in patients with stage II and III R0 resected gastric cancer.
Joon-Bo Shim,Eunsoo Lee,Sang-Woon Kwon,Chang Hwa Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
A phosphorylation (phosphate precipitation) technology of metal chlorides is considering as a proper treatment method for recovering the fission products in a spent molten salt. In KAERI’s previous precipitation tests, the powder of lithium phosphate (Li3PO4) as a precipitation agent reacted with metal chlorides in a simulated LiCl-KCl molten salt. The reaction of metal chlorides containing actinides such as uranium and rare earths with lithium phosphate in a molten salt was known as solidliquid reaction. In order to increase the precipitation reaction rate the powder of lithium phosphate dispersed by stirring thoroughly in a molten salt. As one of the recovery methods of the metal phosphates precipitated on the bottom of the molten salt vessel cutting method at the lower part of the salt ingot is considered. On the other hand, a vacuum distillation method of all the molten salt containing the metal phosphates precipitates was proposed as another recovering method. In recent study, a new method for collecting the phosphorylation reaction products into a small recovering vessel was investigated resulting in some test data by using the lithium phosphate ingot in a molten salt containing uranium and three rare earth elements (Nd, Ce, and La). The phosphorylation experiments using lithium phosphate ingots carried out to collect the metal phosphate precipitates and the test result of this new method was feasible. However, the reaction rate of test using lithium phosphate ingot is very slower than that of test using lithium phosphate powder. In this presentation, the precipitation reactor design used for phosphorylation reaction shows that the amount of molten salt transferred to the distillation unit will reduce by collecting all of the metal phosphates that will be generated using lithium phosphate powder into a small recovering vessel.
Development of implant loading device for animal study about various loading protocol: a pilot study
Joon-Ho Yoon,Young-Bum Park,Yuna Cho,Chang-Sung Kim,Seong-Ho Choi,Hong-Seok Moon,Keun-Woo Lee,June-Sung Shim 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.4
PURPOSE. The aims of this pilot study were to introduce implant loading devices designed for animal study and to evaluate the validity of the load transmission ability of the loading devices. MATERIALS AND METHODS. Implant loading devices were specially designed and fabricated with two implant abutments and cast metal bars, and orthodontic expansion screw. In six Beagles, all premolars were extracted and two implants were placed in each side of the mandibles. The loading device was inserted two weeks after the implant placement. According to the loading protocol, the load was applied to the implants with different time and method,simulating early,progressive,and delayed loading. The implants were clinically evaluated and the loading devices were removed and replaced to the master cast, followed by stress-strain analysis. Descriptive statistics of remained strain (με) was evaluated after repeating three cycles of the loading device activation. Statistic analysis was performed using nonparametric, independent t-test with 5% significance level and Friedman's test was also used for verification. RESULTS. The loading devices were in good action. However, four implants in three Beagles showed loss of osseointegration. In stress-strain analysis, loading devices showed similar amount of increase in the remained strain after applying 1-unit load for three times. CONCLUSION. Specialized design of the implant loading device was introduced. The loading device applied similar amount of loads near the implant after each 1-unit loading. However, the direction of the loads was not parallel to the long axis of the implants as predicted before the study.
Shim, Sung Ryul,Kim, Jae Heon,Kim, Khae Hawn,Yoon, Sang Jin,Lee, Won Jin,Kim, Hae Joon,Bae, Jae Hyun S. Karger AG 2012 UROLOGIA INTERNATIONALIS Vol.88 No.4
<P>Abstract</P><P><B><I>Objectives:</I></B> The timing of visiting a hospital after self-perception of lower urinary tract symptoms (LUTS) is different between individuals. The association between the self-perception period (S-PP) of LUTS and the progression of LUTS has seldom been documented. The aim of this study was to investigate the association between the S-PP of LUTS and the International Prostate Symptom Score (IPSS). <B><I>Subjects and Methods:</I></B> This was a cross-sectional study comprising 267 men aged 40 years and older who participated in a prostate examination survey between February and May 2009. Survey questionnaires included items on the IPSS, the S-PPs of seven individual LUTSs assessed in the IPSS. <B><I>Results:</I></B> The S-PP of LUTS became significantly longer as the severity of LUTS increased. Of the seven symptoms, a weak urinary stream and nocturia showed longer S-PPs than others. Partial correlation between the S-PP and IPSS showed a statistically significant positive correlation. Linear regression analysis showed a statistically significant relationship that unstandardized coefficients included 0.051 and 0.005 for IPSS and quality of life. <B><I>Conclusions:</I></B> These findings suggest that the S-PP is an independent risk factor for LUTS progression. S-PPs have to be considered for treatment or prevention of LUTS.</P><P>Copyright © 2012 S. Karger AG, Basel</P>
Evolving Neural Network Controller for Stabilization of Inverted Pendulum System
Shim, Young-Jin,Kim, Min-Sung,Lee, Joon-Tark 東亞大學校 大學院 2000 大學院論文集 Vol.25 No.-
도립전자 시스템은 대표적 비선형 시스템으로 특유의 구조적인 불안정성 및 비선형성으로 인해, 여러가지 제어 기법이 제안되고 있다. 그러나 이들은 파라미터의 변동에 민감하고 적절한 피드백 이득의 결정이 어려울 뿐만 아니라, 레일의 진동 및 경사 등 외란 발생 시에 안정화되지 못하는 결점을 갖고 있다. 이를 해결하고자 제안되어진 종래의 진화형 신경회로망(ENNC)은 연산량의 증대로 인한 연산 시간의 증가, 메모리 사용의 비효율성 등의 자체의 구조적인 문제점을 가지고 있다. 따라서, 본 논문에서는 도립전자 시스템의 안정화 제어를 위하여 선택, 교배, 돌연변이의 진화 연산자에 의해 일시에 최적의 구조와 결합가중치로 진화시켜 가는 새로운 형태의 ENNC를 제안하고자 한다. 또한, 시뮬레이션을 통해 다양한 초기치에 적응된 최적 구조와 결합가중치를 갖는 새로운 형태의 ENNC를 도립전자 시스템의 안정화 제어에 적용함으로써 본 논문에서 제안한 ENNC의 우수성과 강인성을 입증하고자 한다.
Two Step Process for the Recovery of Strontium From Salt Solution
Sang Woon Kwon,Eunsoo Lee,Byungsuk Park,Joon Bo Shim,Chang Hwa Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
It has been investigated on the management of the nuclides in KAERI. Strontium-90 is a high heatgenerating nuclide in spent nuclear fuel. It is needed to separate the salt from the salt solution for the recovery of strontium after the chlorination of the strontium oxide in molten salt. A vacuum distillation technology was used for the separation of strontium from the molten salt. It was investigated on operating conditions of reactive distillation process for the recovery of the strontium from the salt solution. At a reduced pressure, considerable amount of the carbonation agents such as K2CO3 and Li2CO3 were reduced during heating in the distiller due to the thermal decomposition. Therefore, the two step process was proposed, which is composed of a reaction step at an atmospheric pressure and a salt distillation step at a reduced pressure. In the reaction step, the condition of low temperature and high pressure is suitable to suppress the decomposition of the carbonation agent. In the salt distillation step, reduced pressure is preferable at a suitable temperature depending on the evaporation rate of the salt.