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.

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.

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.

Comparison of various statistical methods for detecting disease outbreaks

Choi, Byeong Yeob,Kim, Ho,Go, Un Yeong,Jeong, Jong-Hyeon,Lee, Jae Won Springer-Verlag 2010 COMPUTATIONAL STATISTICS Vol.25 No.4

Proteomic Analysis of the Protein Expression in the Cochlea of Noise-Exposed Mice

Jong Woo Chung,Nam Kyung Yeo,안윤숙,Ji Won Kim,Seung Hyo Choi,Gil Chai Lim 대한청각학회 2011 Journal of Audiology & Otology Vol.15 No.3

Background and Objectives: When noise-induced hearing loss occurs, destruction of the hair cells is accompanied by mechanical injury, chemical injury, and hypoxia. Proteomics is a powerful tool for protein analysis, as it provides valuable information regarding the biochemical processes involved in diseases, monitors cellular processes, and characterizes protein expression levels. We attempted to identify the proteins associated with the pathophysiology of noise-induced hearing loss, as well as the mechanisms of this disease, using a proteomics approach. Materials and Methods: We used BALB/C male mice. The control mice were placed in a booth without noise, while the experimental mice were exposed to noise for three hours daily for three consecutive days. Cochleae from each group were obtained for total protein extraction. The proteins were separated into numerous spots using two-dimensional electrophoresis. Seven protein spots that were strongly detected only in the noise-exposed cochleae were selected and subsequently analyzed using matrix-assisted laser desorption/ionization time of flight mass spectrometry. Results: Approximately 286 protein spots were detected in the noise group. Seven selected spots were analyzed and various proteins identified, including tyrosine protein kinase MEG2, angiopoietin-like 1, heat shock 70 kDa protein, sodium dicarboxylate cotransporter 1, myeloid Elf-1-like factor, disintegrin, metalloproteinase domain 7, and activated leukocyte-cell adhesion molecule. Conclusions: We identified several proteins expressed in noise-induced hearing loss using a proteomics approach. These proteins may help us to understand the pathogenic mechanisms of noise-induced hearing loss. Introduction Noise is a common cause of sensorineural hearing impairment in industrialized countries. Millions of people currently have disabilities caused by noise-induced hearing loss and experience problems in communication with families, colleagues, and friends.1) In particular, tinnitus is one of the symptoms of noise-induced hearing loss that brings severe social isolation and leads to degraded quality of life. Noise exposure can physically destroy the tympanic membrane, middle ear, and inner ear and can alter the intracellular pathways that lead to cell necrosis or apoptosis, and induced hearing loss worsens. In addition, noise stimulation was recently found to induce metabolic changes inside the inner ear. Possible mechanisms underlying this noise-induced tissue damage are oxidative stress and the reduction of cochlear blood flow.2) Studies have been conducted in the last few decades on mechanical trauma and the metabolic damage of mechanical changes. Vascular endothelial growth factor, nuclear factor κB, glucose transporter-1, and hypoxia-inducible factor-1α are thought to be causes of noise-induced hearing loss. Most of them were histologically confirmed by immunohistochemical and fluorescence staining.4,5,6)Proteomics is a powerful tool for protein analysis, as it provides valuable information regarding the biochemical processes involved in diseases, monitors cellular processes, and characterizes protein expression levels. We can understand the pathophysiology of disease through analysis of the proteins involved using proteomics technology, which includes two-dimensional gel electrophoresis (2-DE) and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS). These techniques can be used to produce a high-resolution two-dimensional map, in which individual (stained) proteins appear as spots of various sizes and intensities that depend on the amount of each protein in the sample.7,8)To understand the proteins associated with the pathophysiology of noise-induced hearing loss, as well as the mechanisms of the disease, we compared expressed proteins in noise-exposed mice with those in unexposed mice using this proteomics approach. For this, we investigated expressed protein spots only in noise-exposed mice. Materials and Methods Materials As experimental groups, 8-week-old BALB/c mice with normal Preyer's reflexes and normal hearing thresholds in auditory brainstem response were studied. Methods Experimental setting All mice were placed in separate soundproof booths with blocks to outside noise. We set an amplifier (R-399, INTER M, Seoul, Korea) in the left side of the room and placed an 8 Ω resistance speaker (290-8L, ALTEC LANSING, Oklahoma City, OK, USA) on the amplifier with a 45 degree horn. Anesthesia of experimental groups All mice were anesthetized (Ketamine hydrochloride 59 mg/kg and xylazine 1.3 mg/kg body weight) via intraperitoneal injection. If necessary, we injected an additional half dose of anesthestics. Threshold measurement The auditory brainstem response (ABR) to click stimuli was recorded, and thresholds were obtained for each ear. Hearing thresholds are measured at wave I lowering by 10 dB from an intensity of 90 dB hearing level (HL). When the wave was not definite, we checked threshold lowering by 5 dB. Click stimuli were filtered from 100 to 3,000 Hz, and the frequency was 1,024/min. Noise exposure procedure Ten mice were exposed continuously for 3 h/day to a 120 dB sound pressure level (SPL) broad band click sound for 1-5 consecutive days. In the noise booth, mice were randomly divided into two groups, and their location inside the booth was changed daily so that each animal was exposed to the same level of noise. Ten normal BALB/c mice kept for 3 h/day for 5 consecutive days in the same noise booth without noise were used as the control group. Acoustic trauma was induced by a continuous pure tone of 6 kHz generate...

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.

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>