열시스템에서 생성된 SO$_{2}$ 가스의 배출저감을 위한 정전기 분무 원리의 응용

정재윤,변영철,황정호,Jeong, Jae-Yun,Byeon, Yeong-Cheol,Hwang, Jeong-Ho 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.8

Emission control of acid exhaust gases from coal-fired power plants and waste incinerators has become an increasing concern of both industries and regulators. Among those gaseous emissions, SO$_{2}$ has been eliminated by a Spray Drying Absorber (SDA) system, where the exhaust gas is mixed with atomized limestone-water slurry droplets and then the chemical reaction of SO$_{2}$ with alkaline components of the liquid feed forms sulfates. Liquid atomization is necessary because it maximizes the reaction efficiency by increasing the total surface area of the alkaline components. An experimental study was performed with a laboratory scale SDA to investigate whether the scrubbing efficiency for SO$_{2}$ reduction increased or not with the application of a DC electric field to the limestone-water slurry. For a selected experimental condition SO$_{2}$ concentrations exited from the reactor were measured with various applied voltages and liquid flow rates. The applied voltage varied from -10 to 10 kV by 1 kV, and the volume flow rate of slurry was set to 15, 25, 35 ml/min which were within the range of emission mode. Consequently, the SO$_{2}$ scrubbing efficiency increased with increasing the applied voltage but was independent of the polarity of the applied voltage. For the electrical and flow conditions considered a theoretical study of estimating average size and charge of the atomized droplets was carried out based on the measured current-voltage characteristics. The droplet charge to mass ratio increased and the droplet diameter decreased as the strength of the applied voltage increased.

골연화증과 저인산혈증을 유발한 인산뇨성 간엽성 종양 -증례 보고-

정재윤,김준혁,이상훈,김한수,Jeong, Jae-Yun,Kim, June-Hyuk,Lee, Sang-Hoon,Kim, Han-Soo 대한근골격종양학회 2004 대한골관절종양학회지 Vol.10 No.2

The phosphaturic mesenchymal tumor mixed connective tissue variant (PMTMCT) is an extremely rare disease, and is frequently associated with oncogenic osteomalacia showing an paraneoplastic syndrome, which is characterized by phosphaturia, hypophosphatemia, normocalcemia and decreased levels of 1,25-dihydroxyvitamin D3 associated with a tumor. We experienced a 45-year-old female who had a soft tissue tumor on her right buttock causing oncogenic osteomalacia, which was satisfactorily treated by surgical excision of the mass. 인산뇨성 간엽성 종양 복합성 결합조직 변이형(PMTMCT)은 매우 드문 질환으로, 인산뇨, 저인산혈증, 정상혈청 칼슘농도, 그리고 감소된 1,25-dihydroxyvitamin D3등의 부종양성 증후군을 보이는 종양성 골연화증을 흔히 유발하는 것으로 알려져 있다. 45세 여자 환자에서 종양성 골연화증의 증상을 동반하는 우측 둔부내 인산뇨성 간엽성 종양을 진단하여, 수술적인 치료로 좋은 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다.

HX-752 변질에 대한 연구

정재윤(Jae-Yun Jeong),윤재호(Jae-Ho Yun),전성호(Seong-Ho Jeon),구명준(Myung-Jun Koo),김한철(Han-Cheol Kim),노태준(Tae-Jun Roh),조현승(Hyun-Seung Jo),박정호(Jung-Ho Park) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.11

본 논문은 고체추진제에 적용되는 결합제인 HX-752의 특성에 관하여 기술하였다. HX-752는 시효성 물질이며 열에 의해 분자구조가 변형되는 물질이다. 열에 의한 변질특성을 확인하기 위해 분석한 변질 활성화 에너지는 2.68 X 10<SUP>4</SUP> cal/g-mol이다. 계산된 변질 활성화 에너지를 활용하여 20, 30, 40, 50℃에서 시간이 지남에 따른 변질 특성에 대한 회귀분석을 수행하였으며 그 오차범위는 약 2.9% 이내임을 확인하였다. 또한 HX-752가 가지고 있는 반응기인 케톤(Ketone)기와 아지리딘(Aziridine)기는 열 변질에 의해 아마이드(Amide)기로 변질됨을 추정하였다. In this study, the properties of HX-752, bonding agent applied to solid propellants are described. The HX-752 is a prescription substance that molecular structure formula is modified by heat. The decomposition activation energy of HX-752 analyzed to confirm thermal decomposition characteristics was 2.68 X 10<SUP>4</SUP> cal/g-mol. Using the calculated decomposition activation energy, regression analysis of HX-752 was performed on the decomposition characteristics over time at 20, 30, 40 and 50℃. It was confirmed that the error range was within 2.9%. In addition, it was estimated that the ketone group and aziridine group, which are the reactors of HX-752, are transformed into amide groups by thermal decomposition.

고체 추진제 접착용 코팅제 조성 연구(Ⅰ)

정재윤(Jae-Yun Jeong),김경민(Kyung Min Kim),박정호(Jung-Ho Park),최성한(Sung-Han Choi) 한국추진공학회 2020 한국추진공학회지 Vol.24 No.5

The adhesion strength of two konds of solid propellants(primary propellant/secondary propellant) was studied by coating agent of adhesion composition composed of organic solvent, curing agent, and cure catalyst. The coating agent using FeAA, cure catalyst, resulted propellant breaking at more 0.14 wt% and interface breaking at less 0.10 wt%. The TPB cure catalyst of confirmed the result of the interface breaking immediately after curing of the secondary propellant. In addition, the coating agent using TPB was found to increase the adhesion strength between the primary propellant and the secondary propellant over time.

ASME CC N-860 기반 평균 온도 기준에 따른 CISCC 진전 속도 민감도 사례 해석

정재윤(Jae-Yoon Jeong),김철호(Cheol-Ho Kim),김윤재(Yun-Jae Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.6

고에너지 열가소성 추진제 제조 및 특성연구

정재윤(Jae-Yun Jeong),송종권(Jong Kwon Song),김윤곤(Yoon-Gon Kim),이병길(Byeong Gil Lee) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12

알루미늄 함량에 따른 로켓보조추진탄용 추진제 특성

정재윤(Jae-Yun Jeong) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.5

본 논문은 알루미늄 함량 변화에 따른 로켓보조추진탄(RAP) 용 추진제의 공정특성(점도), 기계적 물성, 연소특성, 지상 및 비행시험 결과에 관하여 기술하였다. 알루미늄 함량이 증가되면 초기점도는 감소하고 점도 build-up은 빨라지며 연소속도 및 압력지수가 감소하는 것을 확인하였다. 지상연소시험에서는 알루미늄이 10 wt% 함유된 RAP이 알루미늄이 2 wt%, 18 wt% 함유된 RAP에 비해 총역적이 약 5% 높았으며, 이론성능 대비 모터 효율은 알루미늄이 18 wt% 함유된 조성이 85.6%로 가장 낮았다. In this report, the process characteristic(viscosity), mechanical properties, combustion characteristic, ground and flight test results of propellants used for a rocket-assisted projectile are described according to several aluminum contents. As the aluminum content increased, initial viscosity decreased, viscosity build-up accelerated, and combustion rate and pressure exponent decreased. In the ground fire test, the total impulse of the rocket-assisted projectiles containing 10 wt% of aluminum were 5% higher than that of the rocket-assisted projectiles containing 2 wt% and 18 wt% of aluminum. The motor efficiency compared to the theoretical performance was 85.6% with 18 wt% of aluminum, the lowest value among the propellant compositions.

터키 교과서 검정제도 분석

정재윤 ( Jae Yun Jeong ) 부산외국어대학교 지중해지역원 2014 지중해지역연구 Vol.16 No.4

The study aims to review how textbooks are made in Turkey, which is one of the major factors in Turkey`s education system and determine what the system implies. In Turkey, the process of developing textbooks is directly managed and supervised by the Ministry of Education. The Ministry defined the formats of the education system by law and dictated what contents should be included, which languages can be used, and how the textbooks should be edited. Accordingly, textbooks in Turkey are a medium that delivers only the official facts and builds an educational foundation for the country. The textbooks serve as the key channel, through which enacted policies and ideology of the government of Turkey are collected and delivered for the purpose of diffusing official and standardized knowledge for the general public. Such policy originates from the mild nationalism of Ataturk that was aimed to encompass diverse ethnic groups and bind them all together as citizens of Turkey. Education has been given top priority since the days when the nation was engaged in fierce independent movements to secure its sovereignty after the defeat in World War I. The legislation of the Law of Unification of Education 1924 laid the groundwork for building a centralized educational system in Turkey and this has continued until now. The photo of Ataturk, the national flag and anthem of Turkey, which have to be shown in all textbooks have become a powerful symbol of the nation to hold all members of the nation together as the citizens of Turkey by reaffirming the perception on Turkey as the mother country and as being of a homogeneous ethnic origin. Even before the establishment of the Republic of Turkey, education had been implemented as a framework to protect the people of the nation and as a channel to encompass diverse ethnic groups. Textbooks are the mechanism that embodies this ideology in specifics and seem to be an effective method in accomplishing what the government intended. However, to some extent, it restricts the view of the world and view of the values and is likely to cause an excessively standardized education. It seems necessary to adopt more flexibility by expanding autonomy in the education and the textbook developing systems.

고에너지 열가소성 추진제 제조 및 특성연구(Ⅰ)

정재윤(Jae-Yun Jeong),송종권(Jong Kwon Song),김윤곤(Yoon-Gon Kim),이병길(Byeong Gil Lee) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.1

This paper describes the formulation and properties of a recently developed energetic thermoplastic (ETPE) propellant, which is composed of 45% of newly synthesized glycidyl azide polymer, energetic plasticizer (DEGDN) and nitramine oxidizer (RDX). Compared to conventional thermoplastic propellants, the new ETPE propellant showed approximately 7% higher performance and exhibited similar mechanical properties but a lower burn rate and a higher pressure exponent.

알루미늄 함량에 따른 로켓보조추진탄용 추진제 특성

정재윤(Jae-Yun Jeong),최성한(Sung-Han Choi) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.5

In this report, the process characteristic(viscosity), mechanical properties, combustion characteristics, ground and flight test results of propellants used for a rocket-assisted projectile are described according to several aluminum contents. As the aluminum content increased, initial viscosity decreased, viscosity build-up accelerated, and combustion rate and pressure exponent decreased. In the ground fire test, the total impulse of the rocket-assisted projectiles containing 10 wt% of aluminum were 5% higher than that of the rocket-assisted projectiles containing 2 wt% and 18 wt% of aluminum. The motor efficiency compared to the theoretical performance was 85.6% with 18 wt% of aluminum, the lowest value among the propellant compositions.