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김태운,유재충,안덕균,선우섭,이한,손두욱,박충서 慶熙大學校 社會體育硏究所 1994 體育科學論叢 Vol.- No.7
The purpose of the present research is to compare characteristics of maximal anaerobic power observed in different types of sports and player's sex differences. We have reached the following conclusions from the results we obtained by measuring maximal anaerobic power and blood lactate concentration of 60 elite university male and female players during the exercise of bicycle ergometer: 1. As to absolute and relative values of maximal anaerobic power, male players are higher in the order of rugby and handball, whereas female players are higher in the order of hockey and soccer, but no significant differences are observed between types of sports. 2. Male players are noticably higher in absolute values of maximal anaerobic power(p<0.001), but relative value is very simi1ar to that of female players. 3. It is estimated that the fact, that female players show obvious higher mean anaerobic power(p<0.001) during the 3,4KP excercise is due to sex differences in ocdurrence work load of maximal anaerobic power. 4. Comparison of blood lactate concentration at each work load in different types of sports and player's sex differences show an increase in proportion to mean anaerobic power. The results given above clearly show the differences between the type of sports such as rugby and hockey requiring power and speed, and the type of sports such as handball and soccer requiring edurance.
Preparation of Recycled Polyvinyl Alcohol) (PVA)/Iodine Polarizing Film
Han, Man Ho,Shin, Jae Kyun,Oh, Kyeong Il,Lee, Young Jae,Song, Du Hyun,Chung, Yong Sik,Lee, Yong Rok,Choi, Han Gon,Oh, Tae Hwan,Han, Sung Soo,Noh, Seok Kyun,Lyoo, Won Seok SAGE Publications 2010 POLYMERS AND POLYMER COMPOSITES Vol.18 No.7
Tae-Du Han,Jin-Cheol Joeng,Seung-Yong Lim 한국산업식품공학회 2017 학술대회 및 심포지엄 Vol.2017 No.04
The effects of high hydrostatic pressure (HHP) or concentration treatment or sodium hydrogen carbonate addition on microbial and quality properties of cold drip liquid coffee were investigated during storage at room temperature. Cold drip liquid coffee was determined to pH, acidity, general bacteria, and Y&M (Yeast and Molds) according to HHP treatment or adding 0.2% sodium hydrogen carbonate for 40 days storage at 20°C. Also, an equivalent mixture of concentrated coffee and cold drip liquid coffee or liquid coffee with 0.2% sodium hydrogen carbonate was used for determining the sensory evaluation, due-trio and preference test. The cold drip liquid coffee with 0.2% sodium hydrogen carbonate had higher pH and lower titratable acidity than the control during 40 days storage at 20°C. Total viable cell and Y&M counts of cold drip liquid coffee added with 0.2% sodium hydrogen carbonate or treated by HHP at 300 MPa for 25 min were lower than the control during storage at 20°C. The result of the due-trio and preference tests shows that there was no significant difference between cold drip liquid coffee added to 0.2% sodium hydrogen carbonate and the control or between the equivalent mixture of concentrated coffee with cold drip liquid coffee and the control. As a results, Cold drip liquid coffee treated by HHP, concentrated by evaporation, and added to sodium hydrogen carbonate has a potential to extend a shelf life at ambient temperature storage.
Analysis of Gears for a Small Multi-purpose Cultivator using Simulation
( Du-han Kim ),( Seok-pyo Moon ),( Chang-hyun Choi ),( Hae-yoon Tak ),( Teak-jin Kim ),( Tae-ho Han ),( Jong-yeal Sim ),( Yong-joo Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In recently, agricultural population has increased in aging population and women farmers. Therefore, small cultivator is widely used for field operation due to the field of small scale in Korea. This paper is a study that measured and analyzed the engine torque of the small cultivator by ditching rotor operation. Then safety factor and fatigue life was predicted of PTO gears for a small cultivator using the ISO 6336 and Miner’s rule. A load measurement system was constructed with torque sensors to measure the torque of a engine, a measurement device to acquire sensor signals using DAQ NI-USB 6212 and LabView. The PTO gear safety factor and fatigue life prediction of cultivator during rotary tillage was performed using a simulation model. The simulation model was developed by using commercial the KISSsoft software. Field operation was conducted at one transmission gear stage 1st and 2nd PTO gear stage (1st, 2nd) with similar soil conditions. The load data was converted to a load spectrum using the rain-flow counting method and SWT (Smith Watson Topper) equations. The results showed that PTO gear stage was higher consequently the safety factor was increased. Fatigue life of PTO gear shows that Gear 3 was the lowest life. Therefore, farmers should carefully determine the gear stage of the cultivator by considering the load and durability of the machine.
Du, Ho-Ik,Kim, Tae-Min,Han, Byoung-Sung,Hong, Gong-Hyun,Yang, Sung-Chae Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>A superconducting current limiter should secure the stability of a power system by making it durable. That is, even if a fault current is applied repeatedly to a superconductor, its characteristics should remain unchanged. The fault angle at the fault time within a power system varies depending on the failure position, cause, and type. Therefore, to investigate the durability of a superconducting current-limiting element, it is necessary to examine the quenching characteristics based on the fault angles. In this paper, a YBCO-coated conductor, whose current-limiting ability and stability had been proven in previous studies, was used to manufacture superconducting current-limiting elements and conduct a durability test. The durability test measured the quenching characteristics while a fault current was applied repeatedly at certain intervals depending on the fault angles. The superconducting wire used in the durability test was a YBCO-coated conductor with a stainless stabilization layer, which showed the best mechanical characteristics among the various thin-film-type wires.</P>
Tae-Yub Kwon,Seung-Hee Han,Du-Hyeong Lee,Jin-Woo Park,Young Kyung Kim 대한치과보철학회 2024 The Journal of Advanced Prosthodontics Vol.16 No.2
PURPOSE. This study aimed to evaluate the effect of pretreatment of three different universal adhesives (Single Bond Universal [SBU], All-Bond Universal [ABU], and Prime&Bond universal [PBU]) on the bonding durability of an adhesive (Panavia F 2.0, PF) and a conventional (Duo-Link, DL) resin cements to air-abraded zirconia. MATERIALS AND METHODS. Rectangular-shaped zirconia specimens were prepared. The chemical composition and surface energy parameters of the materials were studied by Fourier transform infrared spectroscopy and contact angle measurement, respectively. To evaluate resin bonding to the zirconia, all the bonding specimens were immersed in water for 24 h and the specimens to be aged were additionally thermocycled 10000 times before the shear bond strength (SBS) test. RESULTS. The materials showed different surface energy parameters, including the degree of hydrophilicity/hydrophobicity. While the DL/CON (no pretreatment) showed the lowest SBS and a significant decrease in the value after thermocycling (P < .001), the PF/CON obtained a higher SBS value than the DL/CON (P < .001) and no decrease even after thermocycling (P = .839). When the universal adhesives were used with DL, their SBS values were higher than the CON (P < .05), but the trend was adhesive-specific. In conjunction with PF, the PF/SBU produced the highest SBS followed by the PF/ABU (P = .002), showing no significant decrease after thermocycling (P > .05). The initial SBS of the PF/PBU was similar to the PF/CON (P = .999), but the value decreased after thermocycling (P < .001). CONCLUSION. The universal adhesive pretreatment did not necessarily show a synergistic effect on the bonding performance of an adhesive resin cement, whereas the pretreatment was beneficial to bond strength and durability of a conventional resin cement.
2% 알부틴 함유 하이드로겔 마스크의 기미개선 효과에 관한 연구
한태영 ( Tae Young Han ),손인평 ( In Pyeong Son ),장우선 ( Woo Sun Jang ),장희선 ( Hee Sun Chang ),김지현 ( Ji Hyun Kim ),심영화 ( Young Hwa Sim ),김두호 ( Du Ho Kim ),김범준 ( Beom Joon Kim ),김명남 ( Myeung Nam Kim ),이현경 ( Hy 대한피부과학회 2011 대한피부과학회지 Vol.49 No.3
Background: Melasma is a common, acquired, symmetrical hypermelanosis that occurs on sun exposed areas of the skin. It is more prevalent among Asian women than among Caucasian women. Many different treatment modalities have been used with various efficacies, but none of them have been completely satisfactory. Arbutin is a naturally occurring gluconopyranoside that may reduce tyrosinase activity, which is a rate-limiting enzyme for melanin production. Objective: The purpose of this study was to investigate the depigmenting effect and safety of a mask that contains 2% arbutin for the treatment of melasma. Methods: A total of 54 female volunteers with melasma were enrolled in this randomized, double-blind, 8-week treatment study. The patients were instructed to apply an arbutin-containing mask or an arbutin-free mask once a day for 8 weeks. The assessment of outcomes included the Melasma Area and Severity Index (MASI) score, colorimetric value (L*), overall patient satisfaction and investigator assessment score (evaluated using photography). Results: The arbutin-containing mask significantly increased the right and left colorimetric values (L*) after the 8-week treatment (p<0.05) compared to the arbutin-free mask. The MASI score was decreased more in the arbutin mask group (p>0.05). The arbutin mask scored better than the control in patient satisfaction and investigator assessment. No significant adverse reactions were observed. Conclusion: The arbutin mask appears to be effective and well-tolerated when used for the treatment of melasma. (Korean J Dermatol 2011;49(3):210∼216)
김두범 ( Du Beom Kim ),윤충한 ( Chung Han Yoon ),문태홍 ( Tae Hong Moon ),김승백 ( Seung Baek Kim ),채영호 ( Young Ho Chai ) 한국멀티미디어언어교육학회 2013 멀티미디어 언어교육 Vol.16 No.1
This paper aims at developing multimedia English educational contents which can motivate learners to study English and improve their English abilities by applying the hippocampus learning system to the e-Learning system suggested as means of solving the social problem caused by the gap of English abilities among the people. To develop learning contents, this study tried to find an learning method suitable to adolescents, the main target of this research, by examining their peculiar life styles and values, and searched for various elements which can contribute to the improvement of their English learning. Especially, this study focused on factors contributing to formation of long-term memory, and designed components of multimedia which can help learning contents to be stored as long-term memory. The unity game engine was used to implement the designed components. This study also describes optimization procedure for mobile device, sensor-based character control method, interaction methods, speech synthesis-based voice output, and communication with virtual characters using voice recognition as well. Finally, it predicts learning effects through implemented contents, and suggests limits of the implemented contents, and future directions of the English educational contents for the present young generation.