A Basic Study on Leaf and Stem Production of Angelica acutiloba

Choi,Seong-Kyu,Yun,Kyeong-won,Chon,Sang-Uk,Lee,Jong-Ill,Seo,Young-Nam,Seo,Kyoung-Sun,Choi,Kyeong-Ju 한국자원식물학회 2004 Plant Resources Vol.7 No.3

This study was conducted to develop effective production system in greenhouse for leaves and stems of Angelica acutiloba by using connect pots in 2003 and 2004. Seed germination rate and plant biomass of Angelica acutiloba collected in 2004 were higher than those harvested in 2003. Germination rate of Angelica acutiloba seeds collected in 2003 was 10%, while germination rate of seeds collected in 2004 was above 90%. Especially, plant growth and yield of Angelica acutiloba grown in connect pots sized with 4×4×5cm(length×width×height) were the highest. These results indicate that leaf and stem production of Angelica acutiloba can be improved by using connect pots and optimizing seed collecting time in greenhouse.

Growth Characteristics of Dendropanax morbifera in Chonnam

Choi,Seong-Kyu,Yun,Kyeong-Won,Lee,Jong-Il 한국자원식물학회 2002 Plant Resources Vol.5 No.2

This study was carried out obtain basic information for growth characteristics by different age of Dendropanax morbifera in chonnam, such as Yosu, Sunchon, Haenam, Gangjin, Wando. The pH of soil in cultivation area was 5.2 to 5.6 and organic matter was very high up to 10.6% . P205 content of soil in cultivation area was 35.3 to 42.1 mg/L, C.E.S was 13.9 to 14.4 me/100g, and moisture rate was 19.2 to 21.1 % . The flowering of Dendropanax morbifera began from 6~7 years old tree. The flowering date was at 10th of July at Wando. The growth characteristics of 12 years old tree was 929.5cm in stem height, 134.1mm in stem diameter, and 15 years old tree was 1,117.9cm in stem height, 160.8mm in stem diameter. The number of leaf was 13.9 at five years old tree, and the petioles length was 12.6 at five years old tree. Xylem sap can be had at more than 10 years old tree with good growth more than 10 em stem diameter.

대학태권도선수의 실수인식과 의도적 연습 및 인지된 경기력의 관계

최봉준(Choi, Bong Jun),원세종(Won, Se-Jong) 세계태권도문화학회 2022 세계태권도문화학회지 Vol.13 No.2

The purpose of this study was to investigate the relationship of perception of error, deliberate practice, and perceived performance of University Taekwondo Athletes. To this end, 321 Taekwondo athletes (male 207, female 114) participated in this study. Collected data were analyzed by descriptive statistics, correlation, and multiple regression using SPSS 22.0 version. The results revealed as follow. First, learning from error, error risk taking, and thinking about error had a positive effect on deliberate practice. Second, learning from error and thinking about error had a positive effect on performance satisfaction while error risk taking and thinking about error had a positive effect on will to win. Third, deliberate practice had a positive effect on performance satisfaction and will to win. In conclusion, athletes’ perception of error is key component to enhance deliberate practice and perceived performance. Furthermore, deliberate practice was also identified as a variable that improves perceived performance.

데이터 마이닝을 활용한 한국 프로야구 구단의 승패예측과 승률 향상을 위한 전략 도출 연구

김원종 ( Kim Won-jong ),최연식 ( Choi Yeon-sik ),유동희 ( Yoo Dong-hee ) 한국스포츠산업경영학회 2018 한국스포츠산업경영학회지 Vol.23 No.3

본 연구에서는 데이터 마이닝 기법을 활용하여 한국 프로야구의 승패예측모형을 구축하는 실험을 진행하였다. 이를 위해, 2017년에 실시된 한국 프로야구 10개 구단의 전체 경기 중 무승부 경기를 제외한 1,418경기에 대한 자료를 사용하였다. 승패예측모형에는 의사결정나무, 베이즈넷, 인공신경망 알고리즘과 앙상블 기법인 배깅과 부스팅이 사용되었으며, 그 결과 배깅 기법에 인공신경망을 적용한 예측모형에서 가장 높은 예측률인 85.18%를 기록하였다. 다음으로 의사결정나무 기반 예측모형을 활용하여 한국 프로야구 전체 구단에 관한 8개의 승패규칙을 도출하였다. 여기에서 승패규칙은 승패예측에 영향을 미치는 주요 요인들인 팀출루율, 팀타율, 피안타, 안타, 타석, 타수로 표현되며, 도출된 규칙을 바탕으로 구단의 승률 향상에 도움을 주는 전략을 제안하였다. 또한 플레이오프 진출 구단과 미진출 구단에 관한 승리규칙을 각각 4개씩 도출하였고 이를 바탕으로 두 집단에 맞춤화된 승률 향상 전략을 제시하였으며, 실제 구단에서 선수를 영입한 방향과의 비교를 통해 제시된 전략의 활용 가능성을 확인하였다. This study conducted an experiment to develop win-loss prediction models for the Korean professional baseball league using data mining techniques. To this end, we used data on 1,418 games from all games played by the ten Korean professional baseball teams in 2017, except draw games. We developed win-loss prediction models using not only a decision tree, Bayse net, and artificial neural network algorithms, but also ensemble methods, such as bagging and boosting. As a result, first, we found that the artificial neural network-based prediction model using the bagging method reported the best accuracy (85.18%). Second, we derived eight win-loss rules for entire teams from the decision tree-based prediction model. These rules consist of six influential factors: team on base average, team batting average, hit by opponent, hit, plate appearances, and at bat. Using the derived rules, we proposed helpful strategies for improving the winning rate. Third, we derived four winning rules for both playoff teams and non-playoff teams; using the rules we proposed customized strategies for improving the winning rate of the two different groups. Finally, we confirmed the feasibility of the proposed strategies by comparing non-playoff teams’ actual player recruitment strategies.

GG-38 : Minimal invasive surgery (LESS) for huge cystic adnexal tumors in whole abdomen

( In Young Choi ),( Ji Hye Lee ),( Mi Hyun Park ),( Ji Kwoun Park ),( Jeong Kyu Shin1 ),( Won Jun Choi1 ),( Soon Ae Lee ),( Jong Hak Lee ),( Won Young Paik ) 대한산부인과학회 2014 대한산부인과학회 학술대회 Vol.100 No.-

Laparoendoscopic single-site surgery (LESS) is helpful if not an evidence of suspicious malignancy in huge adnexa tumors. This approach might be reasonable alternative to conventional laparoscopic surgery. We report two cases with LESS for huge cystic adnexal tumors in whole abdomen. A 58 years old multigravida woman in menopause underwent removal of a huge cystic adnexal mass that occupied her entire abdomen by LESS.(ca.5200ml aspiration) A 15 years old single nulligravida woman had a huge cystic adnexal tumor in whole abdomen reaching to the level of the xyphoid process. A needle through the transumbilical single port was inserted directly under the mass. Subsequently, 8000 ml of cystic fluid was aspirated without spillage.

Experimental study on enhancing the fuel efficiency of an anodic dead-end mode polymer electrolyte membrane fuel cell by oscillating the hydrogen

Choi, Jong Won,Hwang, Yong-Sheen,Cha, Suk Won,Kim, Min Soo Elsevier 2010 International journal of hydrogen energy Vol.35 No.22

<P><B>Abstract</B></P><P>This paper investigates how to improve the fuel efficiency of an anodic dead-end mode fuel cell for portable power generation. Generally, a periodic purge process in anodic dead-end operation is required to avoid anode flooding caused by back diffusive water from the cathode. However, during the purge process, small amounts of the hydrogen are discharged with the water, lowering the fuel utilization efficiency. Therefore, hydrogen pulsations are introduced and experimental attempt to minimize the purge frequency is conducted in this study. The experimental results indicate that pulsation reduces partial pressure of the water vapor in the anode channel, increasing the interval between purges by approximately three times, thus improving overall efficiency.</P>

Preparation and characterization of fouling-resistant photocatalytic metal membrane embedded with self-organized TiO2 nano tube

Choi, Won-Youl,Park, No-Suk,Wiesner, Mark R.,Kim, Jong-Oh IWA Publishing 2010 Water Science & Technology Vol.62 No.4

<P>A self-organized nano-structured, photocatalytic TiO2 membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized TiO2 membrane was characterized using SEM, XRD and TEM techniques and the operational parameters to fabricate such as anodization time and applied anodic potential were also investigated. The anodized TiO2 membrane showed high photocatalytic performance in terms of refractory organics decomposition, bacteria inactivation and membrane permeability, which suggests that problems of conventional photocatalytic treatment and membrane filtration in water and wastewater treatment may be reduced using this combined process.</P>

Treatment of a pelvic arteriovenous malformation by stent graft placement combined with sclerotherapy

Choi, Sun Young,Do, Young Soo,Lee, Do Yun,Lee, Kwang-Hun,Won, Jong Yun Elsevier 2010 Journal of vascular surgery Vol.51 No.4

<P>We present a 64-year-old woman with left leg swelling for 1 year. Computed tomography imaging showed a large pelvic arteriovenous malformation that consisted of multiple fine shunts between the left internal iliac artery and the long segment of the left external iliac vein. A stent graft was inserted within the left external iliac vein to occlude the arteriovenous shunts with consecutive transarterial sclerotherapy using absolute ethanol. This resulted in complete resolution of the pelvic arteriovenous malformation. To our knowledge, this is the first reported case of stent graft insertion within a large vein for treating arteriovenous malformation.</P>

Proteomic Analysis of Liver Proteins in Rats Fed with a High-fat Diet in Response to Capsaicin Treatments

Choi, Jung-Won,Hwang, Hee-Sun,Kim, Dong-Hyun,Joo, Jeong-In,Yun, Jong-Won 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.4

Consumption of spicy foods has been reported to convey thermogenic properties. Thus, ingredients in these foods could be considered as potential agents for prevention of a positive energy balance and obesity. Capsaicin in particular is one of the main capsaicinoids, which is a pungent principle of red pepper, and is also utilized as a medicine. In this study, 2-dimensional gel electrophoresis (2-DE) was carried out to identify differential expression of liver proteins in rats fed with a high-fat diet (HFD) in response to capsaicin treatments. In addition, immunoblot analysis of some liver proteins was performed for validation of proteomic analysis and suggestions of a molecular action of capsaicin. Results of animal experiments revealed that weight gain of rats in the HFD + Cap group was decreased by 8% compared to the HFD control group. In our search for potential proteins associated with thermo-genesis and lipid metabolism, we analyzed differential expression patterns in rat liver using 2-DE. Proteomic analysis of liver samples demonstrated that approximately 120 spots were differentially expressed from a total of 950 matched spots, of which 23 spots have been identified by peptide mass finger printing using MALDI-TOF mass spectrometry. Protein levels of UCP2 and FAS were decreased, whereas those of p-AMPK, p-ACC, and CPT-1 were increased by capsaicin administration. These data suggest that the effect of capsaicin on energy expenditure and fatty acid oxidation in rat liver might be mediated through activation of the AMPK-ACC-malonyl-CoA metabolic signaling pathway.

Predictors of ICU outcomes in patients with refractory shock treated using vitamin C, hydrocortisone, and thiamine: a preliminary observational study

( Won-young Kim ),( Jae Chol Choi ),( Jong Wook Shin ),( Jae Yeol Kim ),( In Won Park ),( Byoung Whui Choi ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-

Background: Recent studies have demonstrated that vitamin C, hydrocortisone, and thiamine therapy increases survival in sepsis. This pilot study aimed to develop a model for predicting intensive care unit (ICU) mortality before the initiation of a vitamin C protocol for septic shock. Methods: Data were obtained from patients with refractory septic shock (requiring high-dose vasopressors, such as norepinephrine at ≥0.2 μg/kg/min ± vasopressin, despite adequate fluid resuscitation) who were also treated using a vitamin C protocol between September 2018 and February 2019 at a university-affiliated tertiary hospital. Multivariate analysis identified pre-treatment variables that predicted ICU mortality, and the Vitamin for Sepsis (VITASEP) score was calculated using the sum of the simplified β coefficient values. Results: We reviewed 121 patients, including 55 patients (46%) who met inclusion criteria. Multivariate analysis identified the following VITASEP score factors: non-urosepsis (+1 point), body temperature of <37.1°C (+1 point), white blood cell count of <14,000/mm3 (+1 point), and C-reactive protein (CRP) level of <200 mg/L (+2 points). Patients with low scores were more likely to have urosepsis, higher body temperature, higher CRP levels, and higher white blood cell counts. The mean number of vasopressor-free days at day 28 was 24.7 for score 0-1, 17.1 for score 2, 13.6 for score 3, and 9.0 for score 4-5 (P = 0.02). The 28- day mortality rates were 17% for score 0-1, 27% for score 2, 35% for score 3, and 71% for score 4-5 (log-rank P = 0.02). The less fluid requirement and temporal improvement in organ dysfunction and vasopressor dose seemed more apparent in patients with low VITASEP scores. Conclusions: Our results suggest that different subphenotypes exist among sepsis patients treated using a vitamin C protocol, which may respond better to patients with the hyperinflammatory subphenotype.