유무선 통합 인터넷환경에서의 개별화마케팅 지원방안 연구

채승민(Seung-Min Chae),김남호(Nam-Ho Kim) 한국멀티미디어학회 2003 한국멀티미디어학회 학술발표논문집 Vol.2003 No.2

[발표논문] RPCM: 모바일 기기를 이용한 원격 PC제어 에이전트시스템 설계 및 구현

채승민(Seung-Min Chae),김남호(Nam-Ho Kim) 한국지능정보시스템학회 2004 한국지능정보시스템학회 학술대회논문집 Vol.- No.-

RPCM(Remote Personal Computer Management)은 무선인터넷과 PC관리시스템의 결합이다. 모바일기기 사용자는 무선 웹 페이지에 접속하여 자신이 원하는 PC의 제어할 프로세스를 선택하여 제어범위를 선택한 후 제이시간을 설정함으로써 원거리상에 있는 PC를 제어할 수 있다. 또한 사용자의 시스템 사용내역을 모두 이력화하여 관리자에게 정형화된 통계데이터를 제공하며, 사용자에게는 패턴분석을 통해 지름길 경로를 만들어 패킷 데이터의 손실을 줄이고, 통신요금의 감소와 시간의 절약, 편의성 증대에 기여한다.

Nested-PCR법과 Competitive PCR법을 이용한 뽕나무 오갈병(MD) Phytoplasma의 검출과 밀도변화

채승민 ( Seung Min Chae ),이솔 ( Sol Lee ),차병진 ( Byeong Jin Cha ),이혁인 ( Hyok In Lee ),한상섭 ( Sang Sub Han ) 한국산림과학회 2011 한국산림과학회지 Vol.100 No.4

The detectable levels and population fluctuations of phytoplasmas infecting dwarf mulberry trees were investigated using nested-PCR and competitive-PCR methods. Samples of five different types were studied : A. petiole of a leaf that displays dwarf symptoms, B. petiole from apparently healthy leaf residing on a branch also supports a leaf with dwarf symptoms, C. the branch portion that supports a leaf with dwarf symptoms, D. the leaf petiole from healthy appearing leaves on branch with no dwarf symptoms, and branch portion of branch with no dwarf symptoms, E. the rootlets of trees with dwarf symptoms. These 5-parts were collected from each tree during June - April, once in every two months. The phytoplasma was detected from all parts of collected mulberry samples during all seasons using nested-PCR with AS-1/AS-2 primer pairs. The phytoplasma was detected until 104 dilution using direct-PCR method, but it was detected until 1013 dilution by the nested-PCR method. The density of pytoplasma was found to be 7.94×1018-1012copies/μL in mulberry trees. The density of phytoplasma was observed throughout the year in all samples of mulberry trees. The highest rates of phytoplasma was found in the samples B and C during the early growing season followed by the sample A and D during the dormant season. Samples C and E displayed the highest phytoplasma density followed sample D. The density of phytoplasma appeared stable during all the seasons for samples C and A. The result of the present study demonstrates the utility of nested-PCR and competitive-PCR for detection and determination of population fluctuations of phytoplasmas in plant tissues.

가로수 조성 및 관리현황에 대한 지역주민 의식분석을 통한 개선방안 모색

이창헌(Chang-Heon Lee),채승민(Seung-Min Chae),이경민(Kyoung-Min Lee) 한국산림휴양복지학회 2015 한국산림휴양학회 학술발표회 자료집 Vol.2015 No.4

8200호대 전기기관차 국산화 개발을 위한 연구

이진국(Jin-kook Lee),채승민(Seung-Min Chae),이영호(Young-Ho Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

최근 범국가적인 저탄소 환경정책에 따라 대중교통 수단으로서 철도의 중요성이 증가하고 있다. 그러한 측면에서 에너지효율이 높고 환경 친화적이라는 강점을 가진 전기기관차 분야의 연구는 대용량화 및 유지보수 등의 신기술 도입과 더불어 꾸준히 진행되고 있다. 전기기관차 구동용 인버터 장치에 사용되는 소자로서 기존에는 GTO가 주로 사용되어 왔으나 최근 일본 및 유럽의 여러 제조사에서 비교적 대용량의 IGBT가 생산됨에 따라 IGBT가 전기기관차 분야에서 새로운 소자로 부각되기 시작하였다. IGBT는 GTO에 비해 스위칭 주파수나 소음 및 GDU의 간단성 등의 장점을 가지고 있어 기존의 시스템과 비교하여 고조파 저감 효과를 달성할 수 있으며 하드웨어 구성 또한 용이하게 된다. 본 논문에서는 기존 GTO Thyrister 방식의 VVVF 인버터를 IGBT를 주 소자로 한 인버터로 개량한 8200호대 전기기관차의 국산화 개발 연구에 관해 서술하고 시뮬레이션을 기반으로 시스템 구성과 제어 성능의 타당성을 입증하고자 한다. 시뮬레이션은 DC링크단을 공유한 PWM 컨버터 및 인버터로 구성되어 있으며 수학적으로 모델링한 유도전동기와 전기기관차에 적용하여 컨버터 입력단의 단위역률제어, 지령 입력에 대한 DC링크 전압제어 성능 및 전기기관차속도 응답특성을 확인할 수 있다. This paper studied on the power conversion system for electric locomotives. The system uses the IGBT for electric power conversion element. Compared to the GTO, the advantage of the IGBT is that has more higher switching frequency, lower noise and simplicity for GDU. Therefore, it is accomplished reduction of the harmonics, easy for hardware configuration. In this paper, it is described localization development for 8200 series electric locomotives.

IGBT용 수냉각장치 기술 개발

홍억선(Uk-Sun Hong),홍성위(Sung-Wui Hong),이진국(Jin-Kook Lee),채승민(Seung-Min Chae) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

8200호대 전기 기관차의 컨버터/인버터 스택은 GTO 반도체 소자를 사용한다. 이들 전력 반도체 소자들은 많은 열이 발생하므로, 효율적인 냉각을 위하여 수냉각장치가 있다. 현재 개발 중인 스택은 GTO 소자 대신 IGBT 소자를 사용한다. IGBT용 수냉각장치는 기존 차량의 수냉식 구조와 호환성을 갖도록 개발한다. 크기는 기존 스택의 크기 범위 안에서 정한다. 냉각수의 수압, 유량의 조건은 기존 차량과 동일하다. GTO 소자와 IGBT 소자의 특성이 다르기 때문에 IGBT용 수냉각장치의 외형 및 내부 유로의 구조는 새롭게 설계했다. IGBT 케이스의 최대 온도를 80℃이하가 되도록 냉각 효율을 높였다. 실용화를 목적으로 개발하며 제작 공정을 단순화하고 유지 보수가 용이한 구조로 개발했다. The converter and inverter stacks in 8200 series electric locomotive use GTO semiconductors. Since these high power semiconductors generate a high temperature, there exists the water cooling system for efficient cooling. We use IGBT instead of GTO for new development, which will be compatible with the existing system. The size of the new stacks will be within the original size. Pressure and quantity of water flow will be in the same condition of the original. Because IGBT and GTO have different specifications, we designed new outward appearance and inward waterway. The maximum temperature of IGBT case was under 80℃ as improving the efficiency. Also, We simplified manufacturing process and made the system easy for maintenances for practical uses.

고형돈분 처리 시 소나무의 생장반응 및 질소,인산 흡수에 관한 연구

염창호 ( Chang Ho Yeum ),임유미 ( Yu Mi Lim ),채승민 ( Seung Min Chae ),이창헌 ( Chang Heon Lee ) 전북대학교 농업과학기술연구소 2010 농업생명과학연구 Vol.41 No.2

Pinus densiflora Siebold & Zucc. was treated with dried swine excrement at various concentration levels, and their growth reactions and the contents of total kjeldahl nitrogen and total phosphoric acid were analyzed. The results are as follows; 1. When the plants were treated with 0.25% of dried swine excrement, the germination rate of specie was higher than that of the control. However, it showed a tendency to decrease when the treatment concentration got higher than 0.25%. 2. The growth rate of specie was highest when it was treated with 0.25% of dried swine excrement. It tended to decrease with higher treatment concentration than 0.25%. 3. The contents of total kjeldahl nitrogen and total phosphoric acid of Pinus densiflora got higher when the concentration of dried swine excrement increased. The content of total kjeldahl nitrogen got higher in the above ground parts of the plants and the content of total phosphoric acid got higher in the roots. 4. The contents of total kjeldahl nitrogen and total phosphoric acid in the soil were measured before and after the growth experiment of Pinus densiflora treated with dried swine excrement. The contents of nitrogen and phosphoric acid significantly decreased after the experiment. In conclusion, the contents of total kjeldahl nitrogen and total phosphoric acid accumulated in the plants increased as the concentration level of dried swine excrement got higher. The seed germination and plant growth rates were best at 0.25% of dried swine excrement. The treatment of dried swine excrement may bring high effects on increasing the plant growth rate but could damage the plants with higher concentration than they need. Different optimal concentration levels of dried swine excrement for different plants should be found before it is used as fertilizer.

고형돈분 처리에 따른 벚나무의 유묘생장 및 질소,인산 흡수에 관한 연구

염창호 ( Chang Ho Yeum ),임유미 ( You Mi Lim ),채승민 ( Seung Min Chae ),이창헌 ( Chang Heon Lee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2011 한국환경복원기술학회지 Vol.14 No.6

Prunus serrulata var. serrulata f. spontanea (E. H. Wilson) C. S. Chang was treated with dried swine excrement at various concentration levels, and their growth reactions and the contents of total kjeldahl nitrogen and total phosphoric acid were analyzed. The result is as follows; 1. When the plants were treated with 0.25% of dried swine excrement, the seed germination rate of Prunus serrulata var. serrulata f. spontanea was higher than that of the control. However, it showed a tendency to decrease when the treatment concentration got higher than 0.25%. 2. The growth rate of species was highest when they were treated with 0.25% of dried swine excrement. It tended to decrease with higher treatment concentration than 0.25%. Significant difference was clear between the control and the experimental plants of Prunus serrulata var. serrulata f. spontanea. 3. The contents of nitrogen and phosphoric acid in Prunus serrulata var. serrulata f. spontanea also got higher as the concentration of dried swine excrement increased. However, the content of total kjeldahl nitrogen was highest in the leaves, and followed by the roots and stems. In contrast, the content of total phosphoric acid were highest in the roots, and followed by the leaves and stems. Therefore, stems had the lowest contents of both nitrogen and phosphoric acid. 4. The contents of total kjeldahl nitrogen and total phosphoric acid in the soil were measured before and after the growth experiment of Prunus serrulata var. serrulata f. spontanea treated with dried swine excrement. The contents of nitrogen and phosphoric acid significantly decreased after the experiment. In conclusion, the contents of total kjeldahl nitrogen and total phosphoric acid accumulated in the plants increased as the concentration level of dried swine excrement got higher. The seed germination and plant growth rates were best at 0.25% treatment of dried swine excrement. The treatment of dried swine excrement may bring high effects on increasing the plant growth rate but could damage the plants with higher concentration than they need. Different optimal concentration levels of dried swine excrement for different plants should be found before it is used as fertilizer.