http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
장진성,성형건,노태성,최동환,Jang, Jin-Sung,Sung, Hyung-Gun,Roh, Tae-Seong,Choi, Dong-Whan 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
Performance analysis of the interior ballistics has been conducted using the 1-D numerical code called IBcode according to the various conditions such as length of ignition-gas injector, amount of ignition-gas, mass of projectile, and drag force of projectile. In case of the length of ignition-gas injector, the 25~100 % of the full-injector length has been considered as well as the mass & mass flow of the ignition-gas. The mass of the projectile 5~70 kg and its drag force of 0~69 MPa have been also considered. Variables such as breech & base pressure, negative differential pressure and muzzle velocity for the performance analysis have been sorted, too. Firing conditions for the optimal performance have been investigated through these variables.
장진성,성형건,이상복,노태성,최동환,Jang, Jin-Sung,Sung, Hyung-Gun,Lee, Sang-Bok,Roh, Tae-Seong,Choi, Dong-Whan 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
Using the numerical code for the interior ballistics, the performance of the interior ballistics with the characteristic of the ignition-gas injections has been investigated. The ignition gas has been assumed to be injected into the chamber with 3 cases. As the results of analysis, when the ignition-gas has been injected into all chamber area, the pressure distributions of the chamber of the interior ballistics have been uniform and the differential pressure has been stable. The ignition-gas has been injected into the partial area of the chamber, however, the pressure distributions and the differential pressure have been unstable. The case using the longer ignition injector, therefore, seems to be more suitable to improve the stability of the interior ballistics.
장진성(Chang, Jin-Sung),장원용(Jang, Won-Yong),원도연(Won, Do-Yeon) 한국사회체육학회 2015 한국사회체육학회지 Vol.0 No.60
The purpose of this study was to investigate the relative importance of choice attributes in choosing a youth soccer class and to illustrate market segmentation based on the relative importance scores of each choice attribute. Data were collected from 241 users of youth soccer classes and respondents rated the extent to which they prefer 12 scenarios depicting fictional youth soccer classes. The results of conjoint analyses revealed that program was the most important choice factor, followed by administration (or ownership), instructors, and facilities. In addition, based on a cluster analysis and chi-square tests, four market segments were identified and labeled ‘administration-counts’, ‘instructor-focused’, ‘facility-prioritized’, and ‘program-oriented’.
장진성(Jin-Sung Jang),성형건(Hyung-Gun Sung),유승영(Seong-Young Yoo),노태성(Tae-Seong Roh),최동환(Dong-Whan Choi) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
1-D 강내탄도 전산해석 코드인 IBcode를 이용하여 점화제 주입유량 조절을 통한 화포 약실 내 차압 감소방안 연구를 수행하였다. 대구경 화포의 경우 추진제의 점화를 위해 고온의 점화제를 뇌관의 주입구를 통해 약실에 주입시킨다. 따라서 각 주입구를 통해 주입되는 점화제의 유량이 약실 내 추진제의 연소에 영향을 미치게 된다. 기존의 뇌관의 경우 각 주입구의 점화제 유량이 일정하게 설계되어 있다. 이에 본 연구에서는 각 주입구에서의 점화제 유량을 다르게 하여 추진제의 연소에 차이를 주었다. 해석 결과 점화제 주입유량을 탄저 쪽 방향으로 증가시킬 경우 점화제 주입유량이 일정할 경우에 비해 강내 차압이 감소함을 확인하였다. Study on differential pressure in the chamber of cannon by adjusting the mass flow of ignition-gas has been conducted using the 1-D interior ballistics numerical code called IBcode. In case of large-caliber cannon, high temperature ignition-gas is injected to the chamber through the side hole of the primer to ignite the propellant. Therefore, mass flow of injected ignition-gas affects the propellant combustion in the chamber. Mass flow of each side hole of the current primer was uniformly distributed. In this study, differences of propellant combustion with different mass flow of each side hole have been imposed. Results in case of the mass flow increase in the direction to the base show that the differential pressure decreases compared to the uniformed mass flow.
장진성(Jin-Sung Jang),성형건(Hyung-Gun Sung),노태성(Tae-Seong Roh),최동환(Dong-Whan Choi) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
IBcode를 강내 차압감소를 위한 추진제 위치 연구를 수행하였다. 보통 화포의 추진제는 금속재질이나 소진탄피에 장전된다. 따라서 약실이 탄피보다 크다면 추진제(탄피)의 위치가 강내탄도 성능의 주요 인자가 된다. 본 연구에서는 약실 내 빈 공간이 발생하였을 경우를 고려하여 연구를 수행하였다. 3가지 경우에 대해 연구를 수행하였고, 추진제가 약실 가운데에 위치하였을 경우 Breech나 Base에 위치하였을 때의 강내 차압이 감소함을 확인할 수 있었다. 따라서 약실 가운데에 추진제를 위치시키는 것이 강내탄도 성능 향상에 유리하다는 결론을 내릴 수 있었다. The position effect of the solid propellant in the combustion chamber on the decrease of the differential pressure has been investigated using the IBcode. Generally the metallic cartridge or CCC (combustible cartridge case) as the propellant for the cannon has been loaded. The position of the propellant(cartridge) is, therefore, a major factor for the interior ballistics in case the combustion chamber is larger than the cartridge. In this study, three cases of the existence of empty space in the chamber has been considered. As results, the case of the propellant located in the region near the base and breech has shown that the negative differential pressure and the difference between the breech pressure and the base pressure are much higher than those of the case of the propellant located in the center of the chamber. The case of the propellant in the center of the chamber is, therefore, more profitable to improve the performance of the interior ballistics.
논문 : 상변태 ; Alloy 690에서의 결정립계 형상 조절
이진규 ( Jin Kyu Lee ),장진성 ( Jin Sung Jang ),김도향 ( Do Hyang Kim ),이창규 ( Chang Kyu Rhe ),국일현 ( Il Hiun Kuk ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
The influence of heat treatments on the grain boundary morphology of alloy 690 (Ni-30Cr-9Fe) was studied. Serrated grain boundaries were produced by isothermal heat treatment at 800℃ after solution heat treatment at 1150℃ or by control cooling in the temperature range of 800℃ and 400℃ with a rate of 5℃/min or below. The amplitude and wavelength of serrated grain boundaries increased with longer isothermal heat treatment time or slower cooling rates, but showed maximum value at some extent, respectively. Precipitates on the serrated grain boundaries were revealed as Cr23C6 having semi-coherent cube-to cube relationship -{100}matrix//{100}ppt <100>matrix//<100>ppt -with one adjacent grain.
UNS N06690 제1열 시제전열관의 U-굽힘성형에서 형상변화와 표면잔류응력
김우곤,장진성,국일현,주진원,김성청,Kim, Woo-Gon,Jang, Jin-Sung,Kuk, Il-Hiun,Joo, Jin-Won,Kim, Sung-Chung 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.1
Surface residual stresses as well as wall thickness and ovality changes after U-bending process on UNS N06690 row-1 heat exchanger tubes, were estimated. Surface residual stresses were measured by Hole Drilling Method(HDM), calculating the stresses from relieved strains of 3 rosette strain gages. After bending of the tubes, dimensional tolerances for wall thickness and ovality were satisfied with ASTM requirements. Residual stresses at the extrados were introduced with compressive stress(-) by bending operations, and its maximum value reached-319 MPa in axial direction at ${\phi}=0^{\circ}$ in position. Tensile residual stresses(+) of ${\sigma}_zz=45$ MPa,${\sigma}_zz=25$ MPa were introduced in the intrados surface at position of ${\phi}=0^{\circ}$ Maximum tensile residual stress of 170 MPa was detected on the flank side at position of ,${\phi}=95^{\circ}$i.e., at apex region. It appeared that higher stress gradients were generated at the irregular transition regions. In the trend of residual stress changes with U-bend position, the extrados is related with the changes of ovality and the intrados is related with the changes of wall thickness.
Eulerian-Lagrangian 접근법과 SMART scheme을 이용한 강내탄도 전산해석 코드 개발
성형건,장진성,이상복,최동환,노태성,장영재,Sung, Hyung-Gun,Jang, Jin-Sung,Lee, Sang-Bok,Choi, Dong-Whan,Roh, Tae-Seong,Jang, Young-Jae 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
In this paper, a numerical code for the interior ballistics has been investigated. The Eulerian-Lagrangian approach and the SMART scheme have been used in the numerical code for the grain combustion. The translational kinetic energy of the projectile and work done against barrel friction have been considered only. The ghost cell extrapolation method has been used for the chamber change with the projectile movement. The calculation results of the numerical code have been compared and verified through those of IBHVG2 code.