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Chansong Kim,Jin Woong Lee,허준혁,Cheolhyun Park,Dai-Hwan Kim,Gyu Sung Yi1,Ho Chang Kang,Hyun Suk Jung,Hyunjung Shin,Jung Heon Lee 한국생체재료학회 2022 생체재료학회지 Vol.26 No.1
Background: A considerable number of studies has been carried out to develop alloplastic bone graft materials such as hydroxyapatite (HAP) that mimic the hierarchical structure of natural bones with multiple levels of pores: macro-, micro-, and nanopores. Although nanopores are known to play many essential roles in natural bones, only a few studies have focused on HAPs containing them; none of those studies investigated the functions of nanopores in biological systems. Method: We developed a simple yet powerful method to introduce nanopores into alloplastic HAP bone graft materials in large quantities by simply pressing HAP nanoparticles and sintering them at a low temperature. Results: The size of nanopores in HAP scaffolds can be controlled between 16.5 and 30.2 nm by changing the sintering temperature. When nanopores with a size of ~ 30.2 nm, similar to that of nanopores in natural bones, are introduced into HAP scaffolds, the mechanical strength and cell proliferation and differentiation rates are significantly increased. The developed HAP scaffolds containing nanopores (SNPs) are biocompatible, with negligible erythema and inflammatory reactions. In addition, they enhance the bone regeneration when are implanted into a rabbit model. Furthermore, the bone regeneration efficiency of the HAP-based SNP is better than that of a commercially available bone graft material. Conclusion: Nanopores of HAP scaffolds are very important for improving the bone regeneration efficiency and may be one of the key factors to consider in designing highly efficient next-generation alloplastic bone graft materials.
Development of the Smart Mosquito Counter and Identification Device
Hoonbok Yi,Jae-seung Yu,Hyunjung Kim,Wookgyo Lee,YoungRan Ju,Mi-Yeoun Park,E-hyun Shin 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
We developed the smart mosquito counter device (height 1080 mm x width 560 mm x diameter 320 mm, 220V 60Hz 30 W), which can attract the blood sucking female mosquitoes by emitting CO2 gas (300ml/min), can count the number of the captured mosquitoes by an infra-red beam area sensor, can identify the some mosquito species by analyzing mosquito image patterns using RGB (Red, Green, and Blue), and can send the captured mosquitoes’ number and pictures through the CDMA module at the real time. We operated the smart mosquito device and we could know when any mosquito peak time was in a day as well as what the mosquito species are and the captured mosquito numbers are. We found that the accuracy of the smart device was about over 95% compared the real mosquito data including numbers and images and transmitted data by CDMA. Because we can know the mosquito occurrence peak times, locations, and mosquito species by this device, we can efficiently control mosquitoes at the right time, and we can alert the public for any mosquito-born diseases based on the mosquito occurrence data. We can improve the quality of mosquito vector control with the functions of this device and we will develop the smart device to identify more mosquito species.
지능형전력망용 데이터집중장치에 적용 가능한 보안 에이전트 개발 방안1
안현정 ( Hyunjung An ),윤승환 ( Seunghwan Yun ),이옥연 ( Okyeon Yi ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
본 논문에서는 현 지능형전력망 시스템에도 도입이 가능하고 데이터집중장치를 중심으로 지능형전력망 디바이스로부터 수집되는 데이터뿐만 아니라 종합 전력 제어시스템으로부터 전달되는 제어 메시지도 보호할 수 있는 보안 에이전트를 제안한다. 보안 에이전트는 데이터집중장치에 최근접하여 보안 기능을 수행하는 구성요소로서, 지능형전력망의 구축에 관한 법령에서 제시하는 보안요구사항을 만족한다. 보안 에이전트는 보안 기능을 제공하기 위한 추가 구성요소로서 동작하기 때문에 현재 지능형전력망 시스템의 변경 없이 적용 가능하여 추가 도입비용이 적게 들고 사업자가 요구하고 있는 정보보안 문제를 해결할 수 있어 지능형전력망 보안시장 활성화에 이바지할 수 있다.
The Study of Environmental Risk Assessment in Living Modified Silkworm (Bombyx mori)
Kim Hyunjung,Jongwoo Nam,Chuleui Jung,Tae Won Goo,Hoonbok Yi 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
It is true that the proper environmental risk assessments for many GM insects almost have not been executed in Korean research situation. Therefore, we tested the environmental risk assessment of GM silkworms if there is any difference between GM and non-GM silkworms by three. First, we measured their mobility in the breeding environment conditions with food and without food. Secondly, we measured their viability at the Korean artificial extreme environmental conditions (temperature, humidity, food) after escaping from their breeding environments. We observed the egg productivity and the hatchability between non-GM silkworm and transgenic silkworms with four different pair experiments. The mobility of non-GM silkworms and GM silkworms statistically did not differ and the egg production and hatchability was not also different. The hatchability by couple of GM female silkworm and non-GM male silkworm was lower than by non-GM male and female couple. We observed their viability (High Temp., wet and with food: p=0.0434; High Temp., wet and without food p=0.0430; High Temp., dry and with food: p=0.0005; High Temp., dry, without food: p=0.0479) between the GM silkworm and non-GM silkworm, and there was statistically different. Relatively, the viability of GM silkworm was lower than non-GM silkworms. We could not exactly test for viability of silkworm in low temperature conditions because of their hibernating. Although there was any difference in viability and hatchability between GM silkworm and non-GM silkworm, the all ability of GM silkworm was lower than non-GM silkworm. Conclusively, risk of GM silkworm was lower than non-GM silkworm.
Dae Yong Yi,Soon Chul Kim,Ji Hyuk Lee,이은혜,Jae Young Kim,Yong Joo Kim,Ki Soo Kang,Jeana Hong,Jung Ok Shim,Yoon Lee,강빈,이연주,Mi Jin Kim,문진수,Hong Koh,JeongAe You,Young-Sook Kwak,Hyunjung Lim,Hye Ran Yang 대한소아청소년과학회 2019 Clinical and Experimental Pediatrics (CEP) Vol.62 No.1
The Committee on Pediatric Obesity of the Korean Society of Pediatric Gastroenterology, Hepatology and Nutrition newly developed the first Korean Guideline on the Diagnosis and Treatment of Obesity in Children and Adolescents to deliver an evidence-based systematic approach to childhood obesity in South Korea. The following areas were systematically reviewed, especially on the basis of all available references published in South Korea and worldwide, and new guidelines were established in each area with the strength of recommendations based on the levels of evidence: (1) definition and diagnosis of overweight and obesity in children and adolescents; (2) principles of treatment of pediatric obesity; (3) behavioral interventions for children and adolescents with obesity, including diet, exercise, lifestyle, and mental health; (4) pharmacotherapy; and (5) bariatric surgery.