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주파수 선택성 레일리 페이딩 환경에서 부호화 기법을 이용한 직교 멀티캐리어 시스템의 오율 해석
정재필,박기식,한성운,조성준 한국항공대학교 1997 論文集 Vol.35 No.-
본 논문에서는 주파수 선택성 레일리 페이딩 환경에서 RS부호화, 컨벌루션 부호화, 연접부화를 이용하는 직교 멀티캐리어 BDPSK시스템과 QDPSK시스템의 오율특성을 구하였다. 오율특성은 정규화된 지연시간(??), 비트에너지 대 잡음전력 스펙트럼 밀도비(??), 희망 신호전력 대 지연되 비희망 신호전력비(D/U)를 파라미터로 하여 나타내었다. 검토한 결과, BDPSK 신호인 경우 D/U가 20[dB]일 대 오율을 ??으로 유지하기 위해 필요한 Eb/No는 Rs부호화, 컨벌루션 부호화 및 연접부호화에서느 각각 대략 20.8[dB], 16.0[dB], 14.5 [dB]가 필요하며, QDPSK신호인 경우 Rs부호화, 컨벌루션 부호화 및 연접부호화에서 각각 대략 24.0[dB], 18.9[dB], 13.5[dB]가 필요함을 알 수 있었다. This paper has evaluated the error performance of orthogonal multicarrier BDPSK and QDPSK systems which use Reed Solomon coding, convolutional coding, and concatenated coding technique in a frequency selective Rayleigh fading environment. The results show that when D/U (desired wave's power to undesired delayed wave's power ratio)=20dB at error rate of ??, Reed Solomeon coded BDPSK signal, convolutional coded BDPSK signal, and concatenated coded BDPSK signal need about 20.8[dB], 16.0[dB], 14.5[dB] respectively in terms of Eb/No, and Reed Solomon coded QDPSK signal, convolutional coded QDPSK signal, and concatenated coded QDPSK signal need about 24.0[dB], 18.9[dB], 13.5[dB] respectively.
정운관,심재학,김영진 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2
This paper describes experimental evaluation of exposure dose algorithm for film badge and the results of the personnel dosimetry performance test. Reference radiations irradiate seven categories, except the neutron category prescribed in the ANSI N13.11-1993. The performance criterion in a given category, sum of the absolute value of the bias and the standard deviation of the performance quotient, was estimated by the use of film badge algorithm and dose equivalents according to the standard method. As a result, the performance index in a given category showed a good agreement less than tolerance level, for the deep and shallow dose equivalents or absorbed dose, and this study is satisfied with quality decision cnterion of the film badge personnel dosimeter and intercomparison results.
정해덕,박계춘,조재철,정운조,김성구 木浦大學校 工業技術硏究所 1992 工業技術硏究誌 Vol.2 No.-
The polycrystalline CuInS_2 thin films are prepared by vacuum heat treatment of layer, which is deposited by vaccum evaporation in order. The electrical and optical properties of the films are investigated at various sulfur deposition mole rate, substrate temperature, heat treatment temperature and time. From data, n type- CuInS_2 exhibits resistivity, transmittance and energy band gap with 142[Ωㆍ㎝], 73[%], and 1.5[eV] respectively at optimum fabrication condition. Finally, the films are fabricated with chalcopyrite structure.
정운관,백승진,박재덕 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2
The purpose of this paper is to develop dose evaluation algorithm for film badge and describe the results of the personnel dosimetry performance test in KINS. Reference radiations irradiate seven categories, except the neutron category prescribed in the ANSI N13.11-1993, and evaluation algorithm have been obtained from dose characteristic curves. The performance criterion in a given category, sum of the absolute value of the bias and the standard deviation value of the performance quotient, were estimated by the use of film badge algorithm and dose equivalents according to the standard method. As a result, the performance index in a given category showed a good agreement less than tolerance level, for the deep and shallow dose equivalents or absorbed dose Development algorithm can be used for dose evaluation of film-badge personnel dosimetry.
질소 가스 내에서의 전자 수송계수에 대한 몬테칼로 해석
심재학,정운관 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.1
In this paper, electron swarm parameter is calculated by Monte-Carlo method in nitrogen gas. Under the uniform electric field, the motion of electron which depends on the electric field is calculated by time of flight(TOF) method, and the type of collision between electron and nitrogen molecule are determined by the comparison between collision cross section of nitrogen gas and random number. On the assumption that nitrogen pressure is 200[Torr] and 50≤E/p≤700[Vcm^(-1)Torr^(-1)], we calculate the ionization coefficients, drift velocity, energy distribution and diffusion phenomena, and compare these values with experimental values.
김근중,박재운,김명기 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2
The goal of restoration techniques is to improve a given image in some sense. We consider restoration to be a process that attempts to recover an image that has been degraded by using some priori knowledge of the degradation phenomenon. The restoration of images distorted by systems with noisy point spread function and additive detection noise is considered. The criterion considered for the restoration is based on the wiener filter. The overall computation of the Wiener filter can be carried out in the frequency domain using the FFT. The Wiener filer gives better restoration result.
崔在甲,鄭雲夏 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1
The author has studied on the clinical features and symptomatology of 97 MPDS patients, who visited the Dept. of Dentistry, Kyungpook National University Hospital, from January to September in 1982. The results were as follow: In age and sex distribution of patients in this population, the third decades appeared to have the highest prevalence and the male to female ratio was almost 1 to 2.23. As to occupation, students and housewives were revealed to have the highest incidence of MPDS. The chief complaints of patients were pains, TMJ noises, and limitation of mouth opening in order of frequency, and the most prevalent site of symptom was that of preauricular area. In symptom sequence, the majority of initial symptoms were TMJ noise and pain but limitation of mandibular movement was progressively developed, regardless of nature of early symptoms. Chronic unfavorable oral habits were found to be the most possible predisposing factors in this study. The average maximum interincisal distance was 38.13 ± 10.00 mm in males and 30.73 ± 8.75 mm in females, and a deviation of mandible during mouth opening was observed in 60.8% of patients. In TMJ signs, tenderness of the TMJ to palpation was found in 60.8% of patients and TMJ noise was audible in 50.5% of patients with a stethoscope. The muscles of masticatory system were palpated according to usual methods, and a significant incidence of muscular tenderness was present, with the lateral pterygoid muscles being most frequently involved, followed by masseter, medial pterygoid and temporalis muscles.
스위치드 릴럭턴스 電動機의 經濟的인 驅動 시스템에 관한 硏究
김기운,김학성,김재문,원충연 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.2
In this paper, we studied on the comparisons of drive characteristics between modified C-dump converter and asymmetric bridge converter for a switched reluctance motor drive system. In the experiments, the reliability and control capability of asymmetric bridge converter is superior to that of modified C-dump converter and in terms of the number of devices and the high speed capability, modified C-dump converter shows the improved performance when compared with asymmetric bridge converter. The speed control system is controlled by low cost one-chip microcontroller 80C196KB and EPROM is used for the angle control of SRM.
Chung, Sang-Woon,Kim, Mi-Kyung,Chung, Jae-Heun,Kim, Dae-Hyun,Choi, Jae-Sue,Anton, Stephen,Seo, Arnold Y.,Park, Kun-Young,Yokozawa, Takako,Rhee, Sook-Hee,Yu, Byung-Pal,Chung, Hae-Young The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.2
Peroxisome proliferator-activated receptors (PPARs), members of the nuclear hormone receptor family, are key regulators of various metabolic pathways related to lipid and glucose metabolism as well as inflammation. We examined the effect of zingerone, a major ingredient of ginger, on PPAR, hepatic nuclear factor-4 (HNF-4), and nuclear factor-${\kappa}B$ (NF-${\kappa}B$) expression in 21-month-old male Sprague-Dawley rats. Two experimental groups receiving doses of either 2 or 8 mg/kg/day zingerone for 10 days were compared with young rats (6 months old) and an age-matched control group. For molecular work, the endothelial cell line YPEN-1 was used. Both the 2 and 8 mg/kg/day dose of zingerone significantly increased DNA binding activities of PPARs (2.8-fold). Expression of HNF-4 was also increased in the group receiving the 8 mg/kg/day dose. We further showed that zingerone partially prevented the age-related decline in PPAR expression. In vitro experiments revealed zingerone ($10\;{\mu}M$) increased PPAR expression (2.5-fold) to a similar extent as the PPAR agonist fibrate ($5\;{\mu}M$) and suppressed pro-inflammatory transcription factor NF-${\kappa}B$ activity. Collectively, our findings suggest that zingerone exerts its potent anti-inflammatory action by increasing HNF-4 and PPAR activities, while suppressing NF-${\kappa}B$ activity.
Topomer-CoMFA Study of Tricyclic Azepine Derivatives-EGFR Inhibitors
Chung, Jae-Yoon,Pasha, F.A.,Chung, Hwan-Won,Yang, Beom-Seok,Lee, Cheol-Ju,Oh, Jung-Soo,Moon, Myoung-Woon,Cho, Seung-Joo,Cho, Art E. The Korean Society of Toxicogenomics and Toxicopro 2008 Molecular & cellular toxicology Vol.4 No.1
EGFR has been intensively investigated as a target to block the signal transduction pathway which stimulates cancer growth and metastasis. Studies about structure-activity relationship for tricyclic azepine derivatives were performed with topomer-CoMFA. The derived topomer-CoMFA model with steric and electrostatic field parameters based on fragment units gave reasonable statistics ($q^2$=0.561, $r^2$=0.679). The model explains why a halogen atom at the meta position of aniline is important to increases inhibitory activity. This comes from an electrostatically negative groups are favored near this region. The model also shows that there are sterically favored regions around methoxy group extended from oxazepine derivatives. The findings about steric and electrostatic effects can be utilized for designing new inhibitors.