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바울형 미분기 베인휠에서의 유속 불균일 개선에 관한 연구
박덕배,허진혁,문승재,Park, Deok-Bae,Hur, Jin-Huek,Moon, Seung-Jae 한국플랜트학회 2010 플랜트 저널 Vol.6 No.2
The stability of coal pulverizer in the 800 MW coal-fired plants is vital to maintain their performance. Thus, this study analyzed the uneven abrasion of the deflector and coal spillage due to the air velocity maldistribution in the vane wheel of a bowl-type pulverizer as it is a possible cause for problems of facility using pulverized coal. In addition, air flow in the underbowl of a bowl-type pulverizer was studied to check air velocity maldistribution in the vane wheel using numerical method. In an attempt to correct the maldistribution of air velocity, air flow of the modified duct vane was studied as enlarging the length of the duct vanes installed at the air inlet duct of the pulverizer and increasing the angle of inclination. It was found that modified duct vane make the velocity distribution at the vane wheel uniform. formed by the duct vanes installed at the air inlet duct of the pulverizer and swirling flow is the major factor in making the velocity distribution of vane wheel exit uniform. This can prevent the uneven abrasion of the deflector, which is one of the components inside the pulverizer and coal spillage.
박덕배,김창미,천민석,유경자,Park, Deok-Bae,Kim, Chang-Mee,Cheon, Min-Seok,Ryu, Kyung-Za The Korean Society of Pharmacology 1996 대한약리학잡지 Vol.32 No.3
We examined the effects of EGTA and verapamil on phorbol ester-and forskolin-stimulated LH releases and $LH{\beta}$ subunit mRNA levels in order to verify the role of extracellular $Ca^{++}$ on PKC- or cAMP-induced increases in LH release and $LH{\beta}$ subunit mRNA levels in cultured anterior pituitary cells of rat. Forskolin-stimulated $LH{\beta}$ subunit mRNA levels as well as LH release were all suppressed by prevention of $Ca^{++}$ mobilization from extracellular environment, after the treatment of EGTA as a $Ca^{++}$ chelator or verapamil as a $Ca^{++}$ channel blocker. PMA-stimulated $LH{\beta}$ subunit mRNA levels were also suppressed by the treatment of EGTA and verapamil, while PMA-induced LH release was not affected. From the present study, it is, therefore, suggested that PKC activation and cAMP elevation all stimulate $LH{\beta}$ subunit mRNA levels and these are extracellular $Ca^{++}$-dependent. However, LH releases by PKC activation and cAMP increase seem to be different each other. LH release by PKC activation is thought to be independent of extracellular $Ca^{++}$. On the other hand, cAMP stimulated-LH release is thought to be dependent on the entry of extracellular $Ca^{++}$. 흰쥐 뇌하수체 전엽배양세포에서 PKC나 cAMP에 의한 LH 분비와 $LH{\beta}$subunit mRNA 증가과정에서 세포외 $Ca^{++}$의 역할을 검증하기 위하여 phorbol ester와 forskolin에 의해 촉진된 LH 분비와 $LH{\beta}$ subunit mRNA 수준에 미치는 EGTA와 verapamil의 영향을 조사하였다. Forskolin에 의해 촉진된 LH 분비와 $LH{\beta}$ subunit mRNA 수준은 $Ca^{++}$ chelator인 EGTA나 $Ca^{++}$ 채널차단제인 verapamil의 처리로 세포외부로부터 $Ca^{++}$의 이동을 억제시켰을때 모두 감소하였다. PMA에 의해 유도된 LH 분비는 EGTA와 verapamil 처리에 의해 영향을 받지 않았으나 PMA에 의해 촉진된 $LH{\beta}$ subunit mRNA는 억제되었다. 따라서 본 연구에 의하면 PKC 활성화나 세포내 cAMP 농도 증가는 $LH{\beta}$ subunit mRNA 수준을 증가시키며 이러한 과정은 세포외 $Ca^{++}$ 의존적인 것으로 생각된다. 그러나 PKC 활성화나 cAMP 증가에 의한 세포외 $Ca^{++}$의 역할이 서로 다른 양상을 보인다. PKC 활성화에 의한 LH 분비는 세포외 $Ca^{++}$에 비의존적이나 cAMP에 의해 촉진된 LH 분비는 세포외 $Ca^{++}$ 유입의 영향을 받는 것으로 사료된다.
바울형 미분기 덕트베인 형상 개선이 유속 분포에 미치는 영향
박덕배(Duck Bae Park),유호선(Ho-Sun Yoo),문승재(Seung-Jae Moon),이재헌(Jae-Heon Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study analyzed the uneven abrasion of the deflector and coal spillage due to the air velocity maldistribution in the vane wheel of a bowl-type pulverizer. In addition, air flow in the underbowl of a bowl-type pulverizer was studied to check air velocity maldistribution in the vane wheel using numerical method. In an attempt to correct the maldistribution of air velocity, air flow of the modified duct vane was studied as enlarging the length of the duct vanes installed at the air inlet duct of the pulverizer and increasing the angle of inclination. It was found that modified duct vane make the velocity distribution at the vane wheel uniform. formed by the duct vanes installed at the air inlet duct of the pulverizer, swirling flow is the major factor in making the velocity distribution of vane wheel exit uniform and can prevent the
박덕배(Deok-Bae Park),황상현(Sang-Hyun Hwang),이성수(Sung-Soo Lee) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.7
ASDR은 군용 항공기의 주 장비인 ASC와 이에 탑재되는 임무 운용 소프트웨어인 OFP 개발중에는 개발도구로 사용되며 또한 ASC/OFP 개발 후에는 유지/보수용 도구로 사용 될 수 있다. 본 논문에서는 저속통제기용으로 개발된 ASDR의 전체 구조, 기능 및 특히 관성 및 공기 데이터 센서 시뮬레이션 부분에 대하여 기술한다. ASDR(Avionic System Development Rig) is used as a development tool during the design and development of the ASC/OFP and then can be used as a maintenance tool after developing them for a military aircraft. This paper describes the overall structure and the important features of KO-l ASDR, especially about the dynamic simultion of inertial and air data sensors.
흰쥐 뇌하수체 전엽세포에서 PKC나 cAMP에 의한 LH 분비 및 LHβ Subunit mRNA 증가에 미치는 Ca<sup>++</sup>의 영향
박덕배(Deok-bae Park),김창미(Chang-mee Kim),천민석(Min-seok Cheon),유경자(Kyung-za Ryu) 대한약리학회 1996 대한약리학잡지 Vol.32 No.3
흰쥐 뇌하수체 전엽배양세포에서 PKC나 cAMP에 의한 LH 분비와 LHβsubunit mRNA 증가과정에서 세포외 Ca<sup>++</sup>의 역할을 검증하기 위하여 phorbol ester와 forskolin에 의해 촉진된 LH 분비와 LHβ subunit mRNA 수준에 미치는 EGTA와 verapamil의 영향을 조사하였다. Forskolin에 의해 촉진된 LH 분비와 LHβ subunit mRNA 수준은 Ca<sup>++</sup> chelator인 EGTA나 Ca<sup>++</sup> 채널차단제인 verapamil의 처리로 세포외부로부터 Ca<sup>++</sup>의 이동을 억제시켰을때 모두 감소하였다. PMA에 의해 유도된 LH 분비는 EGTA와 verapamil 처리에 의해 영향을 받지 않았으나 PMA에 의해 촉진된 LHβ subunit mRNA는 억제되었다. 따라서 본 연구에 의하면 PKC 활성화나 세포내 cAMP 농도 증가는 LHβ subunit mRNA 수준을 증가시키며 이러한 과정은 세포외 Ca<sup>++</sup> 의존적인 것으로 생각된다. 그러나 PKC 활성화나 cAMP 증가에 의한 세포외 Ca<sup>++</sup>의 역할이 서로 다른 양상을 보인다. PKC 활성화에 의한 LH 분비는 세포외 Ca<sup>++</sup>에 비의존적이나 cAMP에 의해 촉진된 LH 분비는 세포외 Ca<sup>++</sup> 유입의 영향을 받는 것으로 사료된다. We examined the effects of EGTA and verapamil on phorbol ester-and forskolin-stimulated LH releases and LHβ subunit mRNA levels in order to verify the role of extracellular Ca<sup>++</sup> on PKC- or cAMP-induced increases in LH release and LHβ subunit mRNA levels in cultured anterior pituitary cells of rat. Forskolin-stimulated LHβ subunit mRNA levels as well as LH release were all suppressed by prevention of Ca<sup>++</sup> mobilization from extracellular environment, after the treatment of EGTA as a Ca<sup>++</sup> chelator or verapamil as a Ca<sup>++</sup> channel blocker. PMA-stimulated LHβ subunit mRNA levels were also suppressed by the treatment of EGTA and verapamil, while PMA-induced LH release was not affected. From the present study, it is, therefore, suggested that PKC activation and cAMP elevation all stimulate LHβ subunit mRNA levels and these are extracellular Ca<sup>++</sup>-dependent. However, LH releases by PKC activation and cAMP increase seem to be different each other. LH release by PKC activation is thought to be independent of extracellular Ca<sup>++</sup>. On the other hand, cAMP stimulated-LH release is thought to be dependent on the entry of extracellular Ca<sup>++</sup>.