• Title/Summary/Keyword: IS50

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Amplified synthesis and stability of Tn5 polypeptides in escherichia coli (대장균에서의 Tn5 단백질 증폭생합성 및 안정성)

  • 정재성;정재훈
    • Korean Journal of Microbiology
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    • v.27 no.4
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    • pp.323-333
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    • 1989
  • Plasmid DNA molecules containing strong promoter upstream from IS50L or IS50R, the two insertion sequences that flank Tn5, were constructed to amplify the synthesis of Tn5-encoded polypeptides. When proteins made by cells that contain these plasmids were analyzed on polyacrylamide gels, enhanced synthesis of IS50R polypeptides could be detected. Synthesis of this polypeptide apparently is initiated within the large open reading frame of this element. In addition, the stability of IS50L-and IS50R-encoded polypeptides was analyzed. It was found that IS50L polypeptides are relatively unstable in vivo. This instability could account for the observed inability of this element to promote transposition.

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Evaluation of C50 in Elementary School Classrooms (초등학교 교실의 C50 실태 평가)

  • Lee, Seong-Bok;Kim, Myung-Jun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.888-892
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    • 2014
  • This paper evaluates $C_{50}$ in elementary school classrooms and considers utilization of $C_{50}$ as an assessment indicator of acoustic performance. $C_{50}$ is early-to-late arriving sound ratio, recent study reported that $C_{50}$ is more appropriate as a measure of clarity and speech intelligibility than D50 because it is linearly related to subjective responses. The average of $C_{50}$ in elementary school classrooms appeared to be about +2 dB ~ +3 dB throughout 500 Hz ~ 4 kHz. However, absolute evaluation is difficult because there is no suitable reference or standard yet. As deviation of $C_{50}$ according to location is larger than reverberation time, it is expected that $C_{50}$ will be more sensitive when someone assesses acoustic performance of classrooms. Correlation between $C_{50}$ and reverberation time is very high. From logarithmic regression equation, we can estimate appropriate range of $C_{50}$ in elementary school classrooms indirectly, using standard of reverberation time in ANSI.

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A Study on the Improvement of Interfacial Bonding Shear Strength of Ti50-Ni50 Shape Memory Alloy Composite (Ti_{50}-Ni_{50} 형상기억합금 복합체의 계면 접학 전단강도 향상에 관한 연구)

  • Lee, Hyo-Jae;Hwang, Jae-Seok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.10 s.181
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    • pp.2461-2468
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    • 2000
  • In this paper, single fiber pull-out test is used to measure the interfacial bonding shear strength of $Ti_{50}-Ni_{50}$ shape memory alloy composite with temperature. Fiber and matrix of $Ti_{50}-Ni_{50}$ shape memory alloy composite are respectively $Ti_{50}-Ni_{50}$ shape memory alloy and epoxy resin. To strengthen the interfacial bonding shear stress, various surface treatments are used. They are the hand-sanded surface treatment, the acid etched surface treatment and the silane coupled surface treatment etc.. The interfacial bonding shear strength of surface treated shape memory alloy fiber is greater than that of surface untreated shape memory alloy fiber by from 10% to 16%. It is assured that the hand-sanded surface treatment and the acid etched surface treatment are the best way to strengthen the interfacial bonding shear strength of $Ti_{50}-Ni_{50}$ shape memory composite. The best treatment condition of surface is 10% HNO$_3$ solution in the etching method to strengthen the interfacial bonding shear strength of $Ti_{50}-Ni_{50}$ shape memory alloy composite.

The Evaluation of Human Vibration Effect on T-50/A-50 Pilot (T-50/A-50 조종사의 인체 진동 영향성 평가)

  • Moon, Seong-Wook;Cho, Dae-Hyeon;Kim, Young-Ik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.546-549
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    • 2004
  • The T-50/A-50 Golden Eagle was developed for a supersonic trainer and light combat aircraft. At the design stage, vibration control plans were established and applied. For cockpit vibration, crew comfort vibration level was defined by the requirement of MIL-A-8892. It is found that the T-50/A-50 meets the requirement of cockpit vibration from the flight test data analysis. This paper contains the results of cockpit vibration analysis using the flight test data and the results of human vibration analysis lot the pilot inside aircraft. The human vibration level of pilot is increased as dynamic pressure is increased and at the specific high dynamic pressure, the ride comfort indicates 'a little uncomfortable'. Overall analysis results show that the vibration level of T-50/A-50 cockpit is tolerable and not critical for pilot's comfort.

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A study on the development of photoelastic model material with shape memory effect (형상기억효과를 가진 투과형 광탄성 실험용 모델재료 개발에 관한 연구)

  • Lee, Hyo-Jae;Hwang, Jae-Seok;Shimamoto, Akira
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.3
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    • pp.624-634
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    • 1998
  • The photoelastic model material with shape memory effect and the molding processes for the material are developed in this research. The matrix and fiber of the photoelastic model material developed in this research are epoxy resin (Araldite to hardner 10 to 3 (weight ratio)) and wire of $Ti_50-Ni_50$ shape memory alloy, respectively. It is called Ti50-Ni50 Shape Memory Alloy Fiber Epoxy Composite $(Ti_50-Ni_50SMA-FEC).$ Ti50-Ni50 SMA-FEC is satisfied with the requirements of the photoelastic model material and can be used as a photoelastic model material. The maximum recovering strain of $Ti_50-Ni_50$SMA-FEC is occurred at $80^{\circ}C$ in any prestrain of $Ti_50-Ni_50$ shape memory alloy fiber and in any fiber volume ratio. Recovering strain(force) is increased with the increment of the prestrain and the fiber volume ratio. The best prestrain of $Ti_50-Ni_50$SMA-FEC is 5% for the recovering force among 1%, 3%, 5%.

A Study on the Caste of Top 50 Indian Companies' Founders: Analyzing from the Viewpoint of their Wealth, Market Capitalization and the Start-ups' Values (인도 50대(大) 기업 창업주의 출신 카스트 연구: 재산, 시가총액, 스타트업 가치에 따른 기업별 분석)

  • Oh, Hwa-Seok
    • Asia-Pacific Journal of Business
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    • v.12 no.3
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    • pp.251-269
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    • 2021
  • Purpose & methodology - This study is to answer the following three questions, analyzing data on Top 50 Indian Billionaires, Top 50 Indian companies and Top 50 Indian start-ups. The first is whether or not traiditonal merchant caste like Vaisya's ability of creating wealth declined as some studies argue. The second is whether non-merchant caste like Brahmin, Kshatriya, OBC, Dalit, emerged as an India's new business elite. The third is whether the results of top 50 Indian companies and top 50 start-ups' analyses have similarities with that of top 50 Indian Billionaires analysis. Findings - The result is firstly, the ability of creating wealth of businessmen from the merchant caste was still overwhelming. Secondly, the big businessmen' rising from non-merchant castes as a new business elite was extremely rare. Thirdly, according to the analysis of top 50 Indian start-ups, the percentage of Vaisya has significantly declined while the the percentage of upper castes like Brahmin has noticeably increased. Fourthly, no evidence was found that businessmen from the lower castes like OBC or Dalit were increasing the expanding business influence. Research implications - The Studies mean that in big-sized Indian companies, the power of traditional merchant caste remains the same as before and is even reinforcing, while in small start-ups, Vaisya's power is considerably decreasing, and the upper castes like Brahmin who are highly educated are noticeably increasing.

Implementation of JDAM virtual training function using machine learning

  • You, Eun-Kyung;Bae, Chan-Gyu;Kim, Hyeock-Jin
    • Journal of the Korea Society of Computer and Information
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    • v.25 no.11
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    • pp.9-16
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    • 2020
  • The TA-50 aircraft is conducting simulated training on various situations, including air-to-air and air-to-ground fire training, in preparation for air warfare. It is also used for pilot training before actual deployment. However, the TA-50 does not have the ability to operate smart weapon forces, limiting training. Therefore, the purpose of this study is to implement the TA-50 aircraft to enable virtual training of one of the smart weapons, the Point Direct Attack Munition (JDAM). First, JDAM functions implemented in FA-50 aircraft, a model similar to TA-50 aircraft, were analyzed. In addition, since functions implemented in FA-50 aircraft cannot be directly utilized by source code, algorithms were extracted using machine learning techniques(TensorFlow). The implementation of this function is expected to enable realistic training without actually having to be armed. Finally, based on the results of this study, we would like to propose ways to supplement the limitations of the research so that it can be implemented in the same way as it is.

Pressurization Test for Full-scale Static Test of T-50 Aircraft (고등훈련기 전기체 정적시험을 위한 여압시험)

  • Shim, Jae-Yeul;Kim, Tae-Uk;Song, Jae-Chang;Hwang, Gui-Chul;Hwang, In-Hee
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1384-1387
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    • 2003
  • Pressurization test is usually required in aircraft full-scale static test. There are several test conditions including pressurization of cockpit, fuselage fuel tank, air inlet duct for T-50 full-scale static test. In this paper, the test conditions, equipment, piping analysis for the pressurization test are introduced. Tank simulation test is performed to verify the validity of piping analysis and to find good tuning parameters for the pressurization channel in the servo controller. Several test setup for pressurization of T-50 test is introduced. Test article volume is filled by form, $60%{\sim}80%$ volume is reduced for the T-50 full-scale static test. Pressurization system is connected to servo controller which also controls hydraulic actuator. Load and pressure control is synchronized by using the same servo controller during T-50 test. Typical control result for pressurization test condition is shown. Pressurization tests of T-50 full-scale static test was completed successfully.

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A Study on the AC Treeing Characteristics with Tip Radius of Needle Electrode in LLDPE/EVA (침전극 곡률반경에 따른 LLDPE/EVA의 교류트리 특성)

  • Lee, Jae-Pil;Lee, Chung-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07a
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    • pp.476-480
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    • 2003
  • Polyethylene used as insulating material of power cable is nonpolar and low dielectric loss polymer. But it has defects of tree generation and accumulation of space charge by an applied voltage resulting in the decreased life and performance. To solve these problems, mixed films with LLDPE and EVA that is similar to LLDPE at physical properties in case of low VA contents were made and tested due to the blend ratios of 80:20, 70:30, 60:40 and 50:50[wt%] respectively. We investigated AC electrical treeing characteristics to acquire the best mixture ratio and effect of the tip radius of needle electrode to develop excellent treeproof materials. The degree of crystallity calculated with XRD pattern is higher for pure LLDPE, 50:50 and 70:30. For DSC analysis, it is confirmed that the melting points of mixed specimens are lower than that of pure LLDPE and higher than pure EVA's. The shape of tree propagation showed that pure EVA was electrical tree shape of the branch type, pure LLDPE and blended specimens was able to confirm tree shape of the bush type. As the tip radius go up in the blend ratio 70:30 specimen, the tree inception voltage rise. Probably the reason is the relaxation of electric field in the specimen with bigger tip ratio. As the 6 specimens were applied AC 5[KV],7.5[KV],10[KV] respectively, tree growth length is far shorter in the specimen with blend ratio 70:30, 50:50 than in pure EVA and pure LLDPE specimen. Conclusively, it is confirmed that specimens of which blend ratio are 70:30 and 50:50 are good in electrical tree retardant characteristics, especially, 70:30 has lower dielectric loss than 50:50 and its mixture ratio is the best.

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A study on online shared cataloging gateway implementation using Z39.50(information retrieval protocol) (Z39.50(정보검색프로토콜)을 응용한 공동편목 게이트웨이 구축방안 연구)

  • 오정훈;정준민
    • Journal of the Korean Society for information Management
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    • v.14 no.1
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    • pp.183-206
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    • 1997
  • The information Retrieval Protocol, Z39.50 is applied to the shared cataloging gateway. The history and functions of the Z39.50 are reviewed and the characteristics and the database update service of Z39.50 are taken into account in the notion of the shared cataloging. And for the test, one of the domestic on-line shared cataloging systems is adopted and newly remodelled using Z39.50 protocol. Two kinds of Z39.50 shared cataloging gateway models (th centralized shared cataloging gateway model and the distributed shared cataloging gateway model) are operated in Web server.

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