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정용현,임호성,송진희,허희원,신현재,Yong-Hyeon Jeong,Ho-Seong Im,Jin-Hee Song,Hui-Won Heo,Hyun-Jae Shin 한국버섯학회 2024 한국버섯학회지 Vol.22 No.1
Mushroom-based vegan meat has thus far been used as a food for humans instead of pets. However, based on its texture and nutritional content, it is considered suitable for processing into pet treats. In the present study, we developed a prototype dog chew with a sweetening coating added to a fungal mycelium mat obtained by culturing the Basidiomycetous fungus Trametes orientalis. The palatable coating applied to the mycelium mat by plasticizing the mat with glycerol improved the taste and aroma of the existing mat, and the dog consumed it without difficulty. Future improvements may include a softening process to reduce the chewiness level and a procedure to reduce the crude fiber content. Mycelium-mat-based dog chews, manufactured using eco-friendly materials and processes that are not harmful to the environment are expected to enter the market as eco-friendly alternatives to conventional pet treats. Controlling their physical properties require further study.
정용현,이은석,박순영,양창환,정진택,Chung, Yong-hyun,Lee, Eun-seok,Park, Soon-young,Yang, Chang-hwan,Jung, Jin-taeg 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.2
The structural analysis of liquid rocket engine was performed in the case of sinusoidal vibration load to verify structural safety. The finite element model is composed with main liquid rocket engine components, combustion chamber, turbopump, gas-generator, pyro-starter, main pipes, main valve, heat-exchanger, gimbal-mount and brackets. Natural vibration mode analysis and structural analysis for sinusoidal vibration load were performed. The natural mode frequency of liquid rocket engine is twice than that of launch vehicle. In the case of stress result of sinusoidal vibration load, the part of maximum stress has 1.4 margin, so the engine structure is safe for sinusoidal vibration load.
정용현,박순영,Jeong, Yong-Hyeon,Park, Sun-Yeong 한국천문학회 2012 天文學會報 Vol.37 No.2
조립 완료된 엔진시스템을 발사체 스테이지에 장착하기 위한 제반 사항에 대한 프로세서의 개념을 정리하였다. 엔진을 발사체 스테이지에 장착함에 있어서 주의해야 할 안전규칙, 다음으로 엔진을 이송하고 발사체 스테이지 조립장에서의 포장 해제, 입고 검사, 보존 방법 등 엔진을 스테이지에 장착하기 이전의 준비단계로 엔진 장착 준비 단계, 이후 엔진을 장착하는데 필요한 요구조건과 과정중에 수행되는 시험인 기밀시험, 전기 시험 등에 대한 내용이 포함된 엔진 장착 단계, 또한 엔진을 스테이지로부터 분리해야 할 경우 따라야 할 개괄적인 절차를 포함한 엔진 탈거 및 보관 과정에 대한 내용을 포함한다.
Swan-Ganz Catheter를 이용한 심폐기능 이상자의 정확한 Cardiac Output 측정 플랫폼 개발
정용현,나상신,김영길,Jeong, Yong-Hyun,Na, Sang-Sin,Kim, Young-Kil 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.7
In this paper, on cardiopulmonary function in the intensive care unit over the direction of the state to define the diagnostic or therapeutic cardiac output Study on Implementation of measures as a platform, Swan-Ganz Catheter with sensor inserted into the body by inserting a saline solution Using temperature change caused by using thermodilution be used to obtain cardiac output. Swan-Ganz Catheter with temperature sensors and pressure sensors and sensor value which is entered through the acquisition more closely if the cardiac output CO, systemic and pulmonary vascular resistance, oxygen consumption and may be able to more accurately calculate the patient's condition than accurate diagnosis and treatment is possible. 본 논문에서는 심폐기능에 이상이 있는 중환자의 상태를 진단하거나 치료 방향을 정하기 위하여 심박 출량을 측정하는 플랫폼 구현에 관한 연구로써, 센서가 내장된 Swan-Ganz Catheter를 체내에 삽입 후, 생리식염수를 투입하여 생기는 온도변화량을 열희석법을 이용하여 심박출량을 구하는 방법을 사용한다. Swan-Ganz Catheter는 온도센서와 압력센서를 포함하고 있으며 이를 통해 입력되는 센서 값을 보다 세밀하게 수집한다면 심박출량, 전선 및 폐혈관저항, 산소소모량 등을 보다 정확하게 계산해 낼 수가 있으므로 환자의 상태를 보다 정확하게 진단 및 치료가 가능하게 한다.
A Study on Subchronic Inhalation Toxicity of 1-Chloropropane
정용현,한정희,이용훈 한국독성학회 2015 Toxicological Research Vol.31 No.4
This study was conducted to measure toxicity of 1-chloropropane (CAS No. : 540-54-5). According to the OECD Test Guideline 413 (Subchronic inhalation toxicity: 90-day study), SD rats were exposed to 0, 310, 1,250, and 5,000 ppm of 1-chloropropane for 6 h/day, 5 day/week for 13 weeks via whole-body inhalation. Mortality, clinical signs, body weights, food consumption, motor activity, ophthalmoscopy, hematology, serum chemistry, urinalysis, organ weights, gross and histopathological findings were compared between control and all tested groups. No mortality or remarkable clinical signs were examined during the study. No gross lesions or adverse effects on body weight, food consumption, motor activity, ophthalmoscopy, urinalysis, hematology, organ weights were observed in any of male or female rats in all tested groups. In serum biochemistry, glucose was significantly decreased in males of 1,250 and 5,000 ppm groups compared to control group in dose-dependent relationship. In histopathological examination, vacuolation of acinar cells was observed in pancreas of all male and female groups exposed to 1-chloropropane. In conclusion, no observable adverse effect level (NOAEL) was considered to be below 310 ppm/ 6 h/day, 5 day/week for rats.
Subacute Inhalation Toxicity of 3-Methylpentane
정용현,신세호,한정희,이용훈 한국독성학회 2016 Toxicological Research Vol.32 No.3
3-Methylpentane (C6H14, CAS No. 96-14-0), isomer of hexane, is a colorless liquid originating naturally from petroleum or natural gas liquids. 3-Methylpentane has been used as a solvent in organic synthesis, as a lubricant, and as a raw material for producing carbon black. There is limited information available on the inhalation toxicity of 3-methylpentane, and the aim of this study was to determine its subacute inhalation toxicity. According to OECD Test Guideline 412 (subacute inhalation toxicity: 28-day study), Sprague Dawley rats were exposed to 0, 284, 1,135, and 4,540 ppm of 3-methylpentane for 6 hr/day, 5 days/week for 4 weeks via whole-body inhalation. Mortality, clinical signs, body weights, food consumption, hematology, serum chemistry, organ weights, and gross and histopathological findings were compared between control and all exposure groups. No mortality or remarkable clinical signs were observed during the study. No gross or histopathological lesions, or adverse effects on body weight, food consumption, hematology, serum chemistry, and organ weights were observed in any male or female rats in all exposure groups, although some statistically significant changes were observed in food consumption, serum chemistry, and organ weights. In conclusion, the results of this study indicate that no observable adverse effect level (NOAEL) for 3-methylpentane above 4,540 ppm/6 hr/day, 5 days/week for rats.