鐵棒 1回, 2回 및 3回 뒤공중돌아내리기의 比較 分析

申榮吉,金柄斗,安禹洪,金正子,吳東燮,朴宇奎 慶北大學校 體育科學硏究所 1987 체육과학연구지 Vol.3 No.-

The purpose of this study was to offer gymnasts data for successfully performing triple back somersault dismount(TBSD) and for designing training programs to progress gymnasts to the advanced dismount skills from the horizontal bar through comparative analysis of selected biomechanical factors of single back somersault dismount(SBSD), double back somersault dismount(DBSD) and TBSD. The subjects employed were a total of 4 male middle and high school gymnasts aged between 15 and 16 years. A motion-picture camera, fliming at a nominal rate of 54 frames/s, was used to record the performance of subjects on each trial. This camera was placed at a distance of 15 m from the inward pole of horizontal bar with its optical axis at right angle to this pole. The results obtained are summarized as follows: The mean release angle was 80.5° for the SBSD, 77.3° for the DBSD and 71.3° for TBSD. There were significant differences between the SBSD and the TBSD(p<0.01), the DBSD and the TBSD(p<0.05) but no significant difference between the SBSD and the DBSD. The angular velocity at release was 4.533 ㎭/s for the SBSD, 5.338 ㎭/s for the DBSD and 6.020 ㎭/s for the TBSD. There was a significant difference among these velocities(p<0.05, p<0.01). The linear velocity at release was 5.458m/s for the SBSD, 5.750m/s for the DBSD and 6.083m/s for the TBSD. In this case, we had a significant difference only between the SBSD and the other two somersaults(p<0.05, p<0.01). The shoulder angle at release was 170.5° for the SBSD, 167.0° for the DBSD and 154.3° for the TBSD. There were significant differences between the SBSD and the TBSD(p<0.05), the DBSD and the TBSD(p<0.05) but no significant difference between the DBSD and the TBSD. The hip and knee angle at release were increased respectively by increasing the number of somersault but showed no significant difference among these angles. The mean flight time from release to landing for each somersault was calculated; it took the subjects 1.315s to perform the SBSD, 1.345s to perform the DBSD and 1.416s to perform the TBSD. There was a significant difference among these somersaults with respect to time(p<0.05, p<0.01). The mean maximum height was 3,633m for the SBSD, 3,720m for the DBSD and 3,780m for the TBSD. There was a significant difference only between the SBSD and the other two somersaults. The mean horizontal distance was decreased respectively by increasing the number of somersault but showed no significant difference among these somersaults with respect to distance. The smallest hip angle during flight in the SBSD was 115.3° at 0.317s after the subject left the bar, for the DBSD it was 48.2° at 0.621s while that of the TBSD was 32.3° at 1,102s after release. The relationship between the time the smallest hip angle observed and the total flight time was determined; it took 24.1% of the total flight time of the SBSD to reach the smallest hip angle. In the DBSD, it took 46.2% of the total flight time to reach for the smallest hip angle and in the TBSD 77.8% of the total flight time to reach the smallest hip angle. From the above results, the gymnast would need to (1) increase angular velocity before release by manipulating of body shape, (2) change the release angle and (3) stay tuck position longer by shortening as quickly as possible the angle of each body joint to perform successfully the TBSD. Also to be able to perform quadruple back somersault dismount, a gymnast would need flight time of a minimum 1,782s.

둥시 장아찌 제조 과정 중 이화학적 특성 변화

차원섭,백신경,나경민,박준희,오상룡,이원영,천성숙,최웅규,조영제 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.4

떫은감 품종의 하나인 등시를 이용하여 감장아찌 제조 중 과육의 이화학적 변화를 조사한 결과, 염도 변화는 저농도 간장 및 된장 침지의 경우 다소 완만한 증가를 보였고, 고농도의 간장 및 된장 침지의 경우 침지 기간내내 증가하는 것으로 나타났다. 간장 침지액 감장아찌의 경도는 간장 및 된장 모두 20-80% 농도에서는 침지 초기에는 증가하다가 침지 기간이 경과할수록 감소하는 경향을 나타내었다. 간장 침지 감장아찌의 색도 변화는 저장기간이 경과할수록 명도가 낮아지는 경향이었고, 적색도와 황색도는 침지액 농도를 달리하였을 경우 농도가 낮을수록, 침지 기간이 길어질수록 높았으며, 침지액 농도에 따른 차이는 크지 않았다. 침지액의 간장 및 된장의 농도를 달리하였을 때 감장아찌 중의 탄닌함량의 변화는 모든 침지액 농도에서 침지 기간이 지속될수록 탄닌의 함량은 저장 초기에 서서히 감소되다가 침지 기간이 길어질수록 급격히 감소하였으며, 첨가량에 따른 탄닌함량의 변화폭은 크지 않았다. 침지액의 간장 및 된장의 농도를 달리하였을 때 감과육에 존재하는 연화효소인 polygalacturonase와 pectinesterase 활성 변화는 간장침지 및 된장침지 모두 침지 초기부터 효소활성이 증가하기 시작하였으며 침지 기간이 경화할수록 효소활성은 더욱 높아지는 것을 알 수 있었고, 침지액의 농도가 높아질수록 효소활성이 억제되었다. Changes of physicochemical properties during the preparation of persimmon pickles were investigated. The salinity in persimmon pickles increased during storage time (0~50 days) with soy sauce and soy paste. When the fermented soy sauce and soy paste was added to the soaking solution with 80~100%, the salinity increased more rapidly. The hardness of persimmon pickles with soy sauce and soy paste was slightly increased up to the 20 or 30th day of storage and then decreased. L value of persimmon pickles was gradually decreased, but a and b value were slightly increased. The concentration of soluble tannin in persimmon pickles was slightly decreased down to the 20th day of storage and then decreased rapidly. The activities of polygalacturonase and pectinesterase as softening enzyme in persimmon pickles with soy sauce and soy paste increased during storage time (0-50 days) and enzyme activity was inhibited by high concentration of soaking solution.

항 혈소판 요법을 이용한 관동맥내 Stent 삽입술의 조기 결과

손지원,김영준,손민수,오세진,안태훈,최인석,신익균 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.6

신안 상서고분군 석재에 대한 암석학적 특성과 석재 유통 고찰

윤석태 ( Youn Seok-tai ),고영구 ( Koh Yeong-koo ),오강호 ( Oh Kang-ho ),김해정 ( Kim Hae-jung ),신자경 ( Shin Ja-kyeong ),김해경 ( Kim Hai-gyoung ) 한국도서(섬)학회 2018 韓國島嶼硏究 Vol.30 No.1

이 연구는 전남 신안군 상태도에 위치한 상서고분군 축조에 사용된 석재들에 대한 암석학적 특성과 채석 등 유통과정에 대해 고찰하고자 하였다. 고분 축조에 사용된 석재들에 대한 암석학적 특성 연구는 외관적 관찰에 의한 암석기재적 연구와 편광현미경 하에서 암석의 광물조성과 조직특성에 대한 연구 및 암석의 주성분 함량조성을 통한 지구화학적 연구를 수행하였다. 이 연구들과 함께 주변지질들과 관련하여 고분석재들의 채석과 이송 등에 대한 연구도 병행하였다. 고대로부터 신안군 일대는 한국-중국-일본을 연결하는 고대 해상교통로에 중요한 위치를 점하는 것으로 알려져 고분 축조에 사용되었던 석재 연구는 고대 해양사 측면에서 의미를 지닌다고 할 수 있다. 기재적 관찰에서 석재들은 중성암맥 기원인 안산반암을 제외하고는 대부분이 응회암류에 해당한다. 이들은 라필리응회암과 세립질 응회암으로 구분되는데 대부분 세립질 응회암에 속한다. 응회암 구성입자들은 각상에서 초각상이고 분급도는 불량하다. 세립질 응회암들은 매우 치밀한 조직을 보유하고 특히 라필리응회암의 불규칙한 이탈흔들은 타포니(tafoni)와 관련될 가능성이 있다. 응회암의 입자들은 사장석편과 암편 등이 주를 이루며 크기 범위가 광범위하다. 사장석들은 알바이트 쌍정이 잘 나타나고 격자쌍정을 이루는 미사장석들도 출현한다. 응회암의 치밀한 조직은 부분적으로 속성작용과 관련되는 것으로 여겨지며 다양한 풍화정도를 보인다. 또한, 미세한 석영맥들이 응회암들을 종횡으로 관통하고 있다. 상기한 상서고분군 석재들에 대한 주성분 원소 함량에 대한 지구화학적 연구에 의하면, 이들 응회암은 화산암류 관점에서 산성암계열에 근접한 중성암 계열 및 산성암계열에 해당시킬 수 있다. 이러한 함량분포 특성 상, 이 응회암들은 두 가지 군으로 나눌 수 있다. 그리고 TAS(total alakali vs silica) 분류에서 이 응회암들은 저알칼리암 계열에 도시된다. 고분축조에 사용된 응회암들은 주변의 암석과 매우 유사하며 석재들 자체도 광물조상과 조직특성에서 서로 유사정도가 높다. 일반적으로 응회암들은 판상특성, 가공의 용이성 및 상대적인 견고성으로 고분과 건축 등에 많이 이용되어 왔다. 이러한 결과들을 기반으로 고분축조에 사용된 응회암들은 산성암계열에 근접한 중성암계열 및 산성암계열 기원을 가지며 주변 암석에서 채석·이송된 것으로 추정된다. This study considers on petrological characteristics and distribution to building stones of Sangseo tumuli in Santae Island, Shin-an, Jeonnam. The petrological study on the stones includes visually petrographical descriptions, textural study by polarized microscope and geochemical analysis. Along with the study, distribution routes of the stones were traced based on the regional geology of the island. Since ancient times, the study area is important as a base on international maritime traffic route. Therefore, studies on the tumuli are meaningful for ancient maritime history. In visual observation, above building stones are of tuffs except for an andesitic porphyry considered as intermediate dyke. The tuffs are assigned to lapilli and fine ones. Their grains are poorly sorted and angular to very angular in roundness. In particular, the fine tuffs show very dense textures and take up the most part of the building stones. In addition, the stones have irregularly removed depressions inferred as the linkage to tafoni, in lapilli tuffs particularly. The tuffs are mainly of plagioclases laths, rock fragments and matrices and ranges widely in grain size. The plagioclases show mostly unambiguous albite twin. And, microcline crystals are observed in the tuffs too. Matrices in the tuffs are considerably dense and weathered. Dense texture in the rocks are related to diagenesis in part. In addition, thin quartz veins irregularly intruded the rocks vertically and horizontally. According to the geochemical analysis of building stones of above tumuli, the stones might be intermediate rock series near acidic rock ones and acidic rock ones in the correspondence of volcanics. Therefore, the tuffs probably grouped as two types and are assigned to subalkaline rock series by TAS diagram. Most the building stones mutually resemble in visual and textural characteristics. Tuffs are generally platy, easy in use and relatively hard. In addition, rocks very similar to the building stones are widely distributed in surrounding area. Synthesizing above results, it is considered that tuffs used in tumuli building are corresponded to intermediate rock series near acidic rock ones and acidic rock, and got from surrounding rocks.

Effect of Yeast Extract Added in Artificial Media on Mass Production of Aschersonia aleyrodis Conidium

Sang Soo Oh,Jeong Heub Song,Soon Yeong Hong,Shin Chan Lee,Seong Keun Kang 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10

Entomopathogenic fungus Aschersonia aleyrodis naturally occurred on citrus whitefly, Dialeurodes citri nymph was often observed in organic citrus orchards, Jeju. The genus Aschersonia is also known to be toxic against scale insects and other pests. However, little is known about artificial media for mass production of spores of Aschersonia species. Grains are excellent sources of media for mass conidia production of various entomopathogenic fungi. The yeast extract, which converts carbohydrates to carbon dioxides and alcohols, contains a large amount of vitamin B complexes which facilitate the carbohydrate metabolism. The more yeast extract content the more conidia production on artificial medium made from commercial corn flour and corn gluten feed. The number of conidium produced on oat, millet, sorghum, and unhulled barley medium containing 1% yeast extract were 1.8, 1.8, 1.6, and 2.1×1010/plate (90mm × 15mm), respectively. However, the greatest yeast effect among four media showed appeared on sorghum medium, which produced 25 times higher spore production than sorghum alone. Furthermore, the conidia from solid sorghum medium could be easily harvested with cell scraper.

Sensitivities of Entomopathogenic Fungus Aschersonia aleyrodis to Bordeaux Mixtures and Lime Sulfur

Sang Soo Oh,Jeong Heub Song,Soon Yeong Hong,Shin Chan Lee,Seong Keun Kang 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10

Aschersonia aleyrodis was well-known to be a biological control agent for citrus whitefly, Dialeurodes citri. This entomopathogenic fungus is naturally occurred in organic farming citrus orchards in Jeju. Both lime-sulfur and Bordeaux mixtures are extensively used today to control citrus diseases like citrus melanose and citrus scab, especially in organic farming pest management program. The high concentrated lime-sulfur is also used for pest control such as pink citrus rust mite and scale insects. This study was focused to test the conidial germination and sporulation of Aschersonia aleyrodis on potato dextrose agar (PDA) medium containing different concentrations of two fungicides. The conidia of Aschersonia aleyrodis grown on PDA mixed with commercial bordeaux mixtures, CM150-505, at dilution rate 1:200 (water : bordeaux mixture) were well-germinated but not sporulated at all. On the other hand, Aschersonia aleyrodis did not sporulate and germinate on lime sulfur treated PDA medium even at extremely low dilution rate 1:2,048,000 (water : lime sulfur). However, when the mycelial cells grown at 25o C for at least 7 days at soluble starch-tryptone medium were added to PDA, they were well-sporulated even at high dilution rate 1:100 (water : lime sulfur). This result suggested that the spore mixtures of Aschersonia aleyrodis should be applied to field quite long after lime-sulfur spray.

영산강 유역 하상퇴적물의 지화학적 특성과 환경 변화

신상은 ( Sang Eun Shin ),윤석태 ( Seok Tai Youn ),고영구 ( Yeong Koo Koh ),오강호 ( Kang Ho Oh ) 한국지형학회 2015 한국지형학회지 Vol.22 No.3

Considering the sedimentological setting and changes of fluvial environments in Yeongsan river area, this study investigated the depositional and geochemical characteristics of the river. In addition, the present study results were compared to the previous ones by Oh(2002). The channel deposits of the river were composed mainly of gravels in the upper stream, sands in the midstream, and silts and clays in the downstream. The deposits were strongly correlated with the mean grain size, Al content, and total organic carbon (TOC) (r values > 0.7). Also, the geochemical elements in the deposits appeared to be controlled by fining of sediments, surrounding geology, and organic matters like TOC. With regard to metallic Enrichment Factor, Li (1.96), Zn (1.13), and Pb (2.19) were enriched in the deposits; however, P was enriched in some limited areas only. According to the findings by Oh(2002), content changes were recognized in elements of Al, Fe, Mg, Ca, Na, K, Ba, Cu, Ni, Sr, and Pb. Therefore, it is considered that grain size fining of the deposits controls the geochemical behaviors of the above-mentioned elements and that organic matters partly influence behaviors.

Reduction of Biogenic Amines in Cheonggukjang by Adding Combination of Organic Acids and Biogenic Amines Reducing Bacteria

Yeong Geol Won,Hyun-Hee Yu,Young-Wan Kim,Jin Hyo Kim,Han-Joon Hwang,Seon Mi Shin,Jae Ho Lee,Dae Seong Yoon,Hye Jun OH 한국식품영양과학회 2012 한국식품영양과학회 학술대회발표집 Vol.2012 No.10

Simultaneous Identification of Seven Foodborne Pathogens and Escherichia coli (Pathogenic and Nonpathogenic) Using Capillary Electrophoresis-Based Single-Strand Conformation Polymorphism Coupled with Multiplex PCR

OH, MI-HWA,PAEK, SE-HEE,SHIN, GI WON,KIM, HAE-YEONG,JUNG, GYOO YEOL,OH, SANGSUK International Association for Food Protection 2009 Journal of food protection Vol.72 No.6

<P>The objective of this study was to develop a novel technique for parallel analysis of eight important foodborne microbes using capillary electrophoresis-based single-strand conformation polymorphism (CE-SSCP) coupled with multiplex PCR. Specific primers for multiplex PCR amplification of the 16S rRNA gene were designed, corresponding to eight species of bacteria, including Escherichia coli, Clostridium perfringens, Campylobacter jejuni, Salmonella enterica, Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, and Bacillus cereus, for the species-specific identification and optimal separation of their PCR products in subsequent analysis by CE-SSCP. Multiplex PCR conditions including annealing temperature, extension time, the number of PCR cycles, and primer concentrations were then optimized for simultaneous detection of all target foodborne bacteria. The diagnostic system using CE-SSCP combined with multiplex PCR developed here can be used for rapid investigation of causative agents of foodborne illness. The simplicity and high sensitivity of the method may lead to improved management of safety and illness related to food.</P>

BellaGel breast implant: 6-Year results of a prospective cohort study

Oh, Joon Seok,Jeong, Jae Hoon,Myung, Yujin,Oh, Jeongseok,Kang, Shin Hyeok,Park, Eonju,Kim, Ara,Bang, Sa Ik,Heo, Chan Yeong Korean Society of Plastic and Reconstructive Surge 2020 Archives of Plastic Surgery Vol.47 No.3

Background This is the first clinical study conducted among Asian women using breast implants manufactured by an Asian company. Four-year data regarding the safety and efficacy of BellaGel breast implants have already been published, and we now report 6-year data. Methods This study was designed to take place over 10 years. It included 103 patients who underwent breast reconstruction or augmentation using BellaGel breast implants. The rates of implant rupture and capsular contracture were measured and analyzed to evaluate the effectiveness of the breast implant. Results At patients' 6-year postoperative visits, the implant rupture and capsular contracture rates were 1.15% and 2.30%, respectively. The implant rupture rate was 3.77% among reconstruction cases and 0% among augmentation cases. The capsular contracture rate was 5.66% among reconstruction cases and 0.83% among augmentation cases. Conclusions The 6-year data from this planned 10-year study suggest that the BellaGel cohesive silicone gel-filled breast implant is an effective and safe medical device that can be used in breast reconstruction and augmentation.