유기계 흙 포장의 강도 특성

황성필(Sungpil Hwang),정재형(Jaehyeung Jeoung),이용수(Yongsoo Lee),류상훈(Sanghun Ryu) 한국지반환경공학회 2014 한국지반환경공학회 학술발표회논문집 Vol.2014 No.9

양생조건에 따른 유기계 폴리머 흙 포장의 특성

황성필(Sungpil Hwang),정재형(Jaehyeung Jeoung),이용수(Yongsoo Lee),류상훈(Sanghun Ryu) 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.12

탄소배출을 줄이기 위해 각 분야에서 연구가 활발히 진행되고 있고, 도로분야에서도 아스팔트 및 시멘트를 대체하는 공법을 개발하기 위하여 노력하고 있다. 그러나 고화제 중에서 시멘트는 가격이 저렴하고 성능이 우수하여 이를 대체하기에 어려운 실정이다. 고분자 재료는 가벼우면서도 복합기능을 추가할 수 있도록 가공이 쉬워서 여러 가지 용도로 사용되고 있으며, 제조공정에서 탄소배출이 적어서, 시멘트를 이용한 흙 포장을 대체한다면 그 효과가 크다. 본 연구에서는 고화 원리가 다른 3종류의 유기계폴리머 고화제를 사용하여 공기 중 양생과 건조로에 의한 양생을 적용하여 양생방법에 따른 강도의 차이점을 파악하였다. 유기계폴리머 고화제만을 적용하여 산책로 및 자전거도로의 포장에 사용 가능한지를 파악하여, 3가지 종류의 고화제를 적용한 일축압축강도시험에서 모두가 자전거 도로의 최소 소요강도를 만족하는 것으로 나타났다. 그리고 공시체의 함수비 변화에 따르는 흙 포장체의 강도 특성을 평가하여 상관관계를 제시하고 유기계 폴리머 고화제를 이용한 경우의 적절한 양생방법을 제시하였다. The efforts to reduce carbon emission have been made in many aspects and in road, the study to develop the construction method which will replace asphalt and cement is also underway. But given the low cost and high performance offered by cement, among many solidification agents, it’s difficult to seek the competent alternative. Polymeric material has been used in various ways for its advantages including lightweight and easy process for complex function and generates less carbon emission, and thus it would possibly be efficient if it replaces soil pavement using cement. This study, using three different types of organic polymeric solidification agents with different solidification principle, is intended to identify the difference in strength depending on curing method, natural dry or oven dry. Applicability of organic polymeric solidification agents to walkway and bike lane was investigated and as a result of unconfined strength test, all of them satisfied the minimum strength requirements of bike lane. Furthermore, strength characteristics of soil pavement depending on variation of water content was evaluated to identify the relationship, thereby appropriate curing method using organic polymeric solidification agent is proposed.

신형식 프리캐스트 바닥판의 제안

류형근 ( Ryu Hyungkeun¸ ),서정욱 ( Seo Jungwook¸ ),장승필 ( Chang Sungpil¸ ),박성용 ( Park Sungyong¸ ),김영진 ( Kim¸ Young Jin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2

Durability of decks is closely related with a life of bridges. So, to increase a life of bridges application of precast decks to bridges can be useful alternative because precast decks have better qualities than cast-in-place decks. Also, by using precast decks, labor, construction time and maintenance costs can be reduced. In this paper, new type of precast decks was proposed and through an analytical study, this type was observed from the viewpoint of structural characteristics.

Fear and Surprise Facial Recognition Algorithm for Dangerous Situation Recognition

NaeJoung Kwak,SungPil Ryu,IlYoung Hwang 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2

This paper proposes an algorithm for risk situation recognition using facial expression. The proposed method recognitions the surprise and fear expression among human’s various emotional expression for recognizing dangerous situation. The proposed method firstly extracts the facial region using Harr-like technique from input, detects eye region and lip region from the extracted face. And then, the method applies Uniform LBP to each region, detects facial expression, and recognizes dangerous situation. The proposed method is evaluated for MUCT database image and web cam input. The proposed method produces good results of facial expression and discriminates dangerous situation well and the average recognition rate is 91.05%.

Fear and Surprise Facial Recognition Algorithm for Dangerous Situation Recognition

Kwak, NaeJoung,Ryu, SungPil,Hwang, IlYoung The Institute of Internet 2015 International Journal of Internet, Broadcasting an Vol.7 No.2

This paper proposes an algorithm for risk situation recognition using facial expression. The proposed method recognitions the surprise and fear expression among human's various emotional expression for recognizing dangerous situation. The proposed method firstly extracts the facial region using Harr-like technique from input, detects eye region and lip region from the extracted face. And then, the method applies Uniform LBP to each region, detects facial expression, and recognizes dangerous situation. The proposed method is evaluated for MUCT database image and web cam input. The proposed method produces good results of facial expression and discriminates dangerous situation well and the average recognition rate is 91.05%.

고강도의 윙게이트 테스트 후 식초섭취에 의한 회복기의 에너지기질 변화 연구

Young Ju Song(송영주),Sungpil Ryu(류승필) 한국생명과학회 2010 생명과학회지 Vol.20 No.9

본 연구에서는 탈진적인 고강도의 운동 후 현미식초 섭취에 의한 2시간에 걸친 회복기의 에너지기질 변화를 분석하고자 7명의 건강한 대학생을 대상으로 3회의 반복적인 윙게이트 테스트를 통하여 피로를 유발하고 15분이 경과되었을 때 현미식초(brown-rice vinegar, BRV) 또는 물(control, CON)을 섭취시켰다. 채혈은 테스트 전, 후, 회복기 30분, 60분, 그리고 120분에 각각 채혈하였으며, 혈중 글루코스, 젖산, 유리지방산, 암모니아, 그리고 코티졸을 분석하였다. 회복 120분이 경과되었을 때, 4회째의 윙게이트 테스트를 실시하여 3회째에 대한 회복율을 계산하였다. 호흡수, 산소포화도, 그리고 심박수는 유의한 변화는 나타나지 않았다. 혈중 글루코스는 회복 120분에 CON이 BRV에 비하여 유의하게 낮았으며, 혈중 젖산과 암모니아 농도는 회복 60분과 120분에 BRV가 유의하게 낮았고, BRV에서 회복 60분과 120분에 유리지방산 농도가 유의하게 높았다. 윙게이트 테스트의 최대파워 회복율과 체중당 최대파워의 회복 율은 BRV에서 유의한 증가가 나타났다. 이러한 결과는 탈진적인 고강도의 운동 후 현미식초의 섭취에 의해 피로의 회복이 촉진되며, 하루에 두 번 혹은 그 이상 개최되는 경기에 있어서도 효과적인 영양보조물로 사용될 수 있다는 점을 시사한다. We investigated the effect of brown-rice vinegar (BRV) ingestion after strenuous Wingate tests on energy substrates during a 2 hr recovery period. For this, seven healthy male adolescents were chosen as subjects. They performed 3 Wingate tests to induce fatigue, after which they ingested brown-rice vinegar (BRV) drink and/or water as a control (CON) after 15 min of the test. Blood was obtained pre-exercise and 30 min, 60 min, and 120 min post-exercise, and blood glucose, lactate, free fatty acids, ammonia, and cortisol were analyzed. After 120 min of recovery period, the 4th Wingate test was conducted to calculate the power recovery ratio of the 3rd and 4th trials. Breathing frequency, oxygen saturation, and heart rate did not show significant changes. Blood glucose level was lower in CON than BRV after 120 min of recovery, and blood lactate and ammonia levels were lower in BRV at 60 and 120 min. The higher free fatty acids were found at 60 and 120 min in BRV. In addition, Wingate power recovery ratio of peak power and peak power/body weight was significantly higher in BRV compared to CON. These results suggested that BRV ingestion after strenuous exercise facilitates fatigue recovery. Therefore, BRV might be effectively used as an ergogenic aid for events in which competitors compete two or more times a day.

국내외 주요 표준화기구의 표준 진흥 활동에 관한 시사점

진수경(Sookyung Chin),강부미(Boomi Kang),유성필(Sungpil Ryu),이정화(Junghwa Lee) 한국통신학회 2018 한국통신학회 학술대회논문집 Vol.2018 No.6

The effect of swimming exercise and powdered-Salicornia herbacea L. ingestion on glucose metabolism in STZ-induced diabetic rats

( Se Sil Lee ),( Hyobin Seo ),( Sungpil Ryu ),( Tae Dong Kwon ) 한국운동영양학회 2015 Physical Activity and Nutrition (Phys Act Nutr) Vol.19 No.3

[Purpose] The purpose of this study is to observe the effects of Salicornia herbacea L. powder ingestion on carbohydrate metabolism in STZ-induced diabetic rats. [Methods] To achieve this objective, 35 Sprague-Dawley male rats were raised with feed mixed with Salicornia herbacia L. powder and given specific periods to swim for 5 weeks. There was no significant difference in the insulin increase rate while ingesting Salicornia herbacea L. powder and simultaneously exercising. [Results] Compared to the diabetes mellitus group, HOMA-IR was significantly decreased in the diabetes mellitus + exercise group, diabetes mellitus + Salicornia herbacea group, and the diabetes mellitus + Salicornia herbacea + exercise group. However, changes in blood glucose were significant ineach group. Thus, for the result of GLUT-4 and GLUT-2, which are the glycose transporters of the liver and muscle, diabetes mellitus + exercise group, diabetes mellitus + Salicornia herbacea group, and diabetes mellitus + Salicornia herbacea + exercise group showed significantly higher expressions. The glycogen concentration of the liver and muscle was significantly increased in the diabetes mellitus + exercise group, diabetes mellitus + Salicornia herbacea group, and diabetes mellitus + Salicornia herbacea + exercise group. [Conclusion] With the results above, it seems that taking Salicornia herbacea L. powder and exercise will help prevent various diabetic complications. Therefore, the findings of this study could justify Salicornia herbacea L. powder with its basal data of physiological activities and pharmacological components as a type of health functional food.

산양삼 첨가 고지방식이가 골격근의 항세포사멸에 대한 작용 연구

서효빈 ( Hyobin Seo ),김판기 ( Pan Gi Kim ),류승필 ( Sungpil Ryu ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.3

The purpose of this study was to investigate the anti-apoptosis-related protein expression in skeletal muscle of rats with different amount of mountain ginseng (MG) added high-fat diet fed. Twenty-four Sprague Dawley male rats were divided into the high-fat diet control group (CON), 0.5% of MG added diet group (MG1), and 1.0% of MG added diet group (MG2) with eight rats each. The P53, anti-apoptotic protein, was significantly lower in MG2 than CON and MG1. The bcl-2 and bcl-xl, however, were not significantly different from MG1 but from CON. The caspase-9 and -3, were significantly lower in MG groups than CON. In addition, it was dramatically lower in MG2. These results suggested that MG addition to the high-fat diet suppressed p53 protein expression and enhanced anti-apoptototic protein expression. MG may be a positive effects on health as a medicinal plant.

Effects of Opuntia humifusa Supplementation on Lipid Peroxidation and SOD Protein Expression in the Liver, Kidney, and Skeletal Muscle of Rats Fed a High-fat Diet

Daekeun Kwon(권대근),Junyong Kang(강준용),Jinho Park(박진호),Sungpil Ryu(류승필),Youngju Song(송영주) 한국생명과학회 2012 생명과학회지 Vol.22 No.7

본 연구는 안정 시 고지방식이 흰쥐의 신장, 간장 그리고 골격근에서 지질과산화와 SOD 단백질 발현에 손바닥 선인장 보충이 미치는 효과에 대하여 연구하였다. SD계 수컷 흰쥐 16마리를 무작위로 대조군(CG, n=8)과 실험군(EG, n=8)으로 분류하였다. 8주 동안 대조군은 고지방식이를 부하하였으며, 실험군은 5% 손바닥선인장을 보충식이하였다. 본 실험결과, 간장과 신장의 MDA 농도는 EG군이 CG군에 비해 유의하게 낮게 나타났다(p<0.01). 또한 골격근의 MDA 농도도 EG군이 CG군에 비해 높은 경향이 나타났으나, 통계적으로 유의한 차이는 나타나지 않았다. Cu,Zn-SOD 단백질 발현은 신장에서EG군이 CG군에 비해 유의하게 증가하였다(p<0.01). Mn-SOD 단백질 발현은 골격근에서 EG군이 CG군에 비해 유의하게 증가하였다(p<0.01). 이상의 결과로부터 손바닥선인장 보충이 고지방식이 흰쥐의 지질과산화 억제작용과 SOD단백질 발현이 기관특이적인 반응의 항산화 효과가 있는 것으로 나타났다. This study was conducted to investigate the effects of Opuntia humifusa supplementation on lipid peroxidation and superoxide dismutase (SOD) protein expression at resting state in various organs of rats fed a high-fat diet. Sixteen Sprague-Dawley male rats, 6 weeks of age, were randomly divided into two groups: a control diet group (CG, n=8) and an experimental diet group (EG, n=8). They were given a high-fat diet (CG) or a diet supplemented with 5% of O. humifusa (EG) or 8 weeks. The results showed that the malondialdehyde (MDA) levels of the kidney and the liver were significantly lower in the EG group than in the CG group (p<0.01). In addition, the MDA levels in the skeletal muscle of the EG group tended to be lower than those in the CG group, but this difference was not significant. The Cu, Zn-SOD protein expression in the kidney of the EG group was significantly increased compared with that of the CG group (p<0.01). The Mn-SOD protein expression in the skeletal muscle of the EG group was significantly increased compared with that of the CG group (p<0.01). These results suggest that O. humifusa supplementation has antioxidative properties, which are exerted in a specific organ manner, and that it inhibits the action of lipid peroxidation and the expression of SOD in rats fed a high-fat diet.