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Surface Modification by Heat-treatment of Propellant Waste Impregnated ACF
Keun-Sig Yoon,Dae-Ung Pyo,Young-Seak Lee,Seung-Kon Ryu,Xiao Ping Yang 한국탄소학회 2010 Carbon Letters Vol.11 No.2
Propellant waste was impregnated on the surface of activated carbon fiber and heat-treated at different temperature to introduce newly developed functional groups on the ACF surface. Functional groups of nitrogen and oxygen such as pyridine, pyridone, pyrrol, lacton and carboxyl were newly introduced on the surface of modified activated carbon fiber. The porosity, specific surface area, and morphology of those modified ACFs were changed as increasing the heat-treated temperature from 200 to 500℃. The optimum heat-treatment temperature was suggested to 500℃, because lower temperature given rise to the decrease of specific surface area and higher temperature resulted in the decrease of weight loss. Propellant waste can be used as an useful surface modifier to porous carbons.
ASRP자료를 이용한 155MM 추진장약 KM4A2 저장수명 추정 연구
윤근식 ( Keun Sig Yoon ),박상원 ( Sang Won Park ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.3
Purpose: The purpose of this study is to provide a statistical method from the data of ASRP’s results and to apply to the reliability assessment of 155mm propelling charge, KM4A2. Methods: The accumulated data through ASRP for 155mm propelling charge were analyzed using regression analysis and MINITAB reliability analysis. The analysis methods used for this study were applied to statistical data types such as continuous data, binominal data. Results: The results of this study are as follows; The failure of 155mm propelling charge is mainly due to the broken charge bag, the decline of stabilizer content. The shelf-life(B5) regarding broken charge bag is 21.1years. The stabilizer content decrease with 0.0227%/year and safety storage period of propellant is 34.6years. Conclusion: The shelf-life of 155mm propelling charge determined by charge bag is estimated 21.1years.
81MM 고폭탄의 ASRP를 위한 포구속도 평가기준 연구
윤근식(Keun-Sig Yoon),김원석(Won-Seok Kim),최준혁(Jun-Hyeok Choi) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.10
저장탄약신뢰성평가(이하 ASRP)는 군에 저장 중인 탄약의 성능, 안정성, 신뢰성을 평가하는 업무이다. 군에 저장 중인 탄약의 성능과 안정성은 장기간의 저장 중에 서서히 떨어지므로 저장탄약의 평가기준은 제조 당시의 성능과 안정성을 평가하는 국방규격에서의 기준과 비교하여 동등하거나 낮은 수준으로 정한다. 본 논문에서는 81MM 고폭탄의 평가항목인 포구속도와 사거리를 대상으로 시험방법과 평가기준을 연구하였다. 포구속도와 사거리에 대한 국방규격 등 관련 기술자료에 따라 두 시험 간 측정방법과 정확성을 분석하고 포구속도와 사거리 시험데이터간 비교, 분석하였다. 연구결과, ASRP에서 포구속도를 측정하는 것이 시험의 신뢰성과 효율성을 높일 수 있다는 것을 확인하였고, 포구속도 표준편차의 평가기준은 4.78 m/s로 제시하였다. The Ammunition Stockpile Reliability Program (ASRP) is a task to evaluate the performance, stability, and reliability of ammunition stored in the military. The evaluation criteria of stored ammunition are set to be equal to or lower than the acceptance test standard of the national defense standard that evaluates the performance and stability at the time of manufacture because the performance and stability of ammunition stored in the field gradually deteriorate as the storage time increases. This study examined the test method and evaluation criteria for the muzzle velocity and range, which are the evaluation parameters of cartridge 81mm, HE(High Explosive). The test method and accuracy between the muzzle velocity and range were compared according to related technical references, such as the defense standards, and correlation analysis of test data between muzzle velocity and range was performed. Therefore, measuring the muzzle velocity is a test method that efficiently evaluates the reliability of ammunition stockpiles, and the evaluation criteria of standard deviation for a muzzle velocity were presented.
윤근식 ( Keun Sig Yoon ),이영석 ( Young Seak Lee ),유승곤 ( Seung Kon Ryu ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
The propellant has a short shelf-life because of nitrogen oxides that were released from nitrocellulose decomposition, As-received and surface-modified ACFs were applied to remove the nitrogen oxides with intend to extend the shelf-life of propellant. The specific surface area of modified ACFs was slightly decreased but nitrogen function groups such as pyridine, pyridone and pyrrol were created on the surface of ACFs. As a result the NO removal capacity of the surface-modified ACF by propellant waste increased about twice than that of the as-received ACF. The shelf-life of propellant was extended about 1.25 times by accompanying surface-modified ACF.
윤근식 ( Keun Sig Yoon ),이종찬 ( Jong Chan Lee ) 한국품질경영학회 2012 품질경영학회지 Vol.40 No.3
Purpose: The purpose of this study was to find out that the statistical method of stockpile reliability of ammunition by items can be applied to the reliability assessment of stockpile ammunition. Methods: We reviewed the statistical method of stockpile reliability of ammunition by items and verified the possibility of its application by case study. Results: We found that the statistical method of stockpile reliability of ammunition by items is very useful and effective to present the reliability of ammunition based on each item and to predict the change of the reliability in the future. The reliability of proximity fuse was about 94.5% and was influenced by manufacture`s year and the difference between lot and lot more than storage period. Conclusion: The statistical method of stockpile reliability of ammunition by items can be applied to the reliability assessment of various stockpile ammunitions such as ammunition for mortar and canon.
소량의 쌀 시료로 신속한 식미 관능평가를 위한 컵 배열 순위법
이점식(Jeom-Sig Lee),곽지은(Jieun Kwak),윤미라(Mi-Ra Yoon),이정희(Jeong-Heui Lee),안억근(Eok-Keun Ahn),박향미(Hyang-Mee Park),원용재(Yong-Jae Won),손지영(Ji Young Shon),김준환(Jun Hwan Kim),서정필(Jung-Pil Suh),천아름(Areum-Chun),전재범 한국육종학회 2015 한국육종학회지 Vol.47 No.2
Rice breeders or sensory evaluators are striving to develop the rapid and correct sensory evaluation method of the cooked rice with a small-sample. This study was conducted to develop a method of cooking condition and sensory evaluation of the cooked rice rapidly and correctly with a small-sample by introducing a concept of arrangement ranking to the conventional sensory evaluation method by cooking in the cup, which has been used only as a simple test. A method of simultaneous cooking of the five samples for one round of test was developed. And, an arrangement ranking method was developed just like stacking a tower by arranging the cups in the sensory evaluation. The proposed method was named as cup arrangement ranking method. The correlation analysis between the cup arrangement ranking method (CARM) and the standard sensory evaluation method(SSEM) showed a high significance of correlation (r=0.83**∼0.91**, ‘13∼’14). Further, when effectiveness of proposed method was compared with the standard sensory evaluation method, the sample quantity was a 30g level for one round of test, which is a tenth of SSEM. The time consumed for sensory evaluation was two minutes per one sample, which was a reduced value by half as compared with the time consumption by SSEM. Therefore, the cup arrangement ranking is expected to be an effective method in the selection of excellent rice line or variety having good taste by evaluating the cooking quality rapidly with a small-sample in early generation.
윤근식,권택만,박병찬,Yoon Keun-sig,Kwon Tag-man,Park Byung-chan 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.4
The ASTP is the standard of the assessment ASRP that is monitoring the performance, reliability and safety characteristics of the ammunition items. The ASTP used in domestic now has applied to US Army's grade system and grading criteria so that it cause some problems. To resolve these problems of ASTP, we surveyed both the quality level of production and the field management of ammunition, which compared with grade system and classification criteria. As a result of study, we changed grade system from four steps to three steps and applied the Korean Military Specifications and the Malfunction Criteria to the classification criteria of grades. We are looking forward to improving the reliability and effectiveness of ASRP assessment by simplifying grade system and generalizing grading criteria of ASTP.