• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
• /
• pp.242-245
• /
• 1988

This paper presents a robust discrete MRAC with the discrete e/sub 1/ -modification. Discrete e/sub 1/ -modification is proposed by extending the Narendra's e/sub 1/ -modification to the discrete version. In this case the adaptive controller was reformed by Lyapunov's direct metbod. And the improved robustness by using this algorithm was showed by sector theory.

• 한국기계가공학회지
• /
• 제11권5호
• /
• pp.42-47
• /
• 2012

Construction equipment is heavily loaded during normal operation. In recent years, there is a trend that lower gear noise levels are demanded for drivers to avoid annoyance and fatigue during operation. For articulated hauler's final drive, meshing transmission error(T.E.) is the excitation that leads the tonal noise known as gear whine, and radiated gear whine is also the dominant source of noise in the whole gearbox. This paper presents a method for the analysis of the tooth profile modification, and the prediction of transmission error under the loaded torques for the spur gear pair of the articulated hauler's final drive. And the transmission error, transmission error harmonics and contact stress are also calculated and compared before and after tooth modification under one torque. The simulation result shows that the transmission error and contact stress under the loads can be minimized by the appropriate tooth profile modification.

• 한국응용약물학회:학술대회논문집
• /
• 한국응용약물학회 1993년도 제2회 신약개발 연구발표회 초록집
• /
• pp.55-55
• /
• 1993

Farnesyl Protein transferase(FPT)는 발암유전자 ras의 단백질 산물인 p$^{21}$의 post-translational modification의 첫 단계인 ras-farnesylation에 관여하는 효소로 본 연구에서는 정제된 FPT와 E. coli에서의 발현 system을 이용하여 FPT의 구조와 기능을 밝히고 이를 FPT 방해제의 설계에 이용하고자 한다. Bovine testis에 존재하는 FPT를 30%-50%의 Ammonium sulfate로 fractionation하고, DEAE-Sephacel, Sephacryl S-300 column을 통과시킨 후 peptide(KKCVIM) affinity column을 이용하여 순수 정제하였다. 정제된 효소의 분자량은 gel-filtration에 의해 100KDa으로 추정되었고 SDS-PAGE 결과 49KDa과 46KDa의 두 subunit로 구성되었음이 확인되었다. 효소활성에는 $Mg^{2＋}$ 와 $Zn^{2＋}$가 필수적이며 최적 pH는 7.0이었다. Yeast의 FPT의 두 subunit 유전자는 Yeast genomic DNA를 template로 사용하고 각 subunit에 specific한 합성된 primer들과 vent polymerase를 이용하여 Polymerase chain reaction을 통하여 얻었다. 두 유전자를 pBluescriptII SK＋ vector를 변형시킨 두 vector, pBSK＋4와 pBChl＋4에 재조합 시킨 후 E.coli에 transformation시켜 발현시켰다. 현재 정제된 Bovine FPT와 E. coli에서 발현된 Yeast FPT의 chemical modification과 site-directed mutagenesis를 통하여 FPT의 active site와 substrate binding site에 관한 연구를 진행시키고 있다.

• Transactions on Electrical and Electronic Materials
• /
• 제14권2호
• /
• pp.94-100
• /
• 2013

The elements B, P and As can each be implanted in silicon; for the fabrication of integrated semiconductor devices and the wells in CMOS (complementary metal oxide semiconductor). The implanted range due to different implanted species calculated using TRIM (Transport of Ions in Matter) simulation results was considered. The profiles of implanted samples could be measured using SIMS (secondary ion mass spectrometry). In the comparison between the measured and simulated data, some deviations were shown in the profiles of MeV implanted silicon. The Moliere, C-Kr, and ZBL potentials were used for the range calculations, and the results showed almost no change in the MeV energy region. However, the calculations showed remarkably improved results through the modification of the electronic stopping power. The results also matched very well with SIMS data. The calculated tolerances of $R_p$ and ${\Delta}R_p$ between the modified $S_e$ of TRIM and SIMS data were remarkably better than the tolerances between the TRIM and SIMS data.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2011년도 춘계학술대회 논문집
• /
• pp.215-216
• /
• 2011

• 한국분말재료학회지
• /
• 제19권3호
• /
• pp.177-181
• /
• 2012

Copper composite materials have attracted wide attention for energy applications. Especially $CuInS_2$ has a desirable direct band gap of 1.5 eV, which is well matched with the solar spectrum. $CuInS_2$ nanoparticles could make it possible to develop color-tunable $CuInS_2$ nanoparticle emitter in the near-infrared region (NIR) for energy application and bio imaging sensors. In this paper, $CuInS_2$ nanoparticles were successfully synthesized by thermo-decomposition methods. Surface modification of $CuInS_2$ nanoparticles were carried out with various semiconductor materials (CdS, ZnS) for enhanced optical properties. Surface modification and silica coating of hydrophobic nanoparticles could be dispersed in polar solvent for potential applications. Their optical properties were characterized by UV-vis spectroscopy and photoluminescence spectroscopy (PL). The structures of silica coated $CuInS_2$ were observed by transmission electron microscopy (TEM).

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 1997년도 제12회 학술발표회 논문개요집
• /
• pp.104-104
• /
• 1997

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2000년도 추계학술대회 논문집
• /
• pp.624-627
• /
• 2000

This paper describes a local modification capability on shell meshes, which can change a 'constant or variable radius of rounding for the s h q edges of the stamping die shoulder in the mesh. The algorithm consists of the followin_e three main steps; (1) the rounding area for sharp edges of a die shoulder are detected from the given shell mesh, (2) a rolling-ball surface with a given constant or variable radius is generated, which is contacti% with two incident face groups of the sharp edges, (3) the rounding area of the mesh is cut off, and a new mesh for the rolling-ball surface is generated and implanted into the gap. Owing to this rounding modification capability, CAE engineers can examine various cases based on the existing dies by scanning them to form polyhedral models and then changing radii of die shoulders for stamping process simulation.

• Journal of information and communication convergence engineering
• /
• 제3권3호
• /
• pp.163-166
• /
• 2005

The Key exchange protocols are very crucial tools to provide the secure communication in the broadband satellite access network. They should be required to satisfy various requirements such as security, Key confirmation, and Key freshness. In this paper, Two authenticated key exchange protocols TPEKE-E(Two Pass Encrypted Key Exchange-Exchange-Efficient) and TPEKE-S(Two Pass Encrypted Key xchange-Secure) are introduced. A basic idea of the protocols is that a password can be represented by modular addition N, and the number of possible modular addition N representing the password is $2^N$. The TPEKE-E is secure against the attacks including main-in-the-middle attack and off-line dictionary attack, and the performance is excellent so as beyond to comparison with other authenticated key exchange protocols. The TPEKE-S is a slight modification of the TPEKE-E. The TPEKE-S provides computational in feasibility for learning the password without having performed off line dictionary attack while preserving the performance of the TPEKE-E.

• 미생물학회지
• /
• 제25권1호
• /
• pp.40-45
• /
• 1987

B Brevibacterium divaricatum FERM 5948 균주로부터 Bdi I RIM 체계에 속하는 BdiI methylase 유천자를 클로닝하여 발현을 조사하였다. Bdi I methylase 유전자의 클로닝을 위해 pBR 322의 EcoRI, BamHl, Sal I 3 군데의 클로닝 site를 이 용했고 1 차 형질전환후 나온 플라스미드를 BdiI으로 자른 뒤 ligation 시키지 않고 형질전환시키는 방법을 이용하였다. 유전 자을 가지는 행질전환체의 선별은 Bdi I methylase에 의해 수정된 채조합 플라스미드는 BdiI 제한효소에 방호된다는 것에 기 초하여 선별하였는데 5.6kb의 EcoRI insert DNA를 가지는 pBDIM 116이 Bdil methylase 유전자플 가지는 것으로 판명 되었다. pBDIM 11&을 가지는 숙주셰포에서 추출한 추출용액에는 S-adenosylmethionine이 있으면 BdiI의 인지부위인 A ATCGAT에만 특정한 methylase 활성이 측정되였다. 11개의 제한효소를 이용하이 제한효소지도를 작성하였고, BdiI r restriction -modification 체계에 관해서 도 논의하였다.