회전익 항공기용 외활형식 착륙장치의 정·동적 분석에 관한 연구

채경덕 三陟大學校 1999 論文集 Vol.32 No.1

It is important to make sure of design's reasonability concerning of structural vibration problems with fulfilling the research and with analyzing the body structures that include the landing gear which has dynamic significant characteristics in helicopter, and to make systematical peocedure which obtains engineering data to guarantee the quality of the analysis of landing gear under FAR regulations was attempted, and systematical procedure for static and dynamic characteristics of the landing gear in many subsystems of the helicopter was classified.

실험적 고찰에 의한 로보트 메니퓰 레이터에 대한 적응 제어

채경덕 三陟大學校 1997 論文集 Vol.30 No.1

본 논문은 robotic 메니퓰레터 s에 관한 새로운 적응운동 제어 구조에 대해 제시한다. 이것은 오직 위치 측정을 요구하는 적응 CTM (Computed Torque Method) 방식이다. 이 측정 Input Torque는 관철 우치와 속도 뿐아니라 비선형 로보트 모델의 관성 매개 변수를 계산하는 EKF(Extended Kalman Filter)에 쓰인다. 이러한 계산은 Input Torque를 발생시키기 위한 CTM에 의하여 사용된다. EKF와 CTM의 관계는 안정한 적응제어 구조의 결과에 의해서 보여진다. 2 자유도 direct-drive robot의 실험결과는 이 구조의 수행을 설명한다.

축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향

정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

불확실성을 갖는 비선형 기계 시스템의 견실 적응 제어에 관한 연구

채경덕 三陟大學校 1997 論文集 Vol.30 No.1

The purpose of this paper is a study on robust adaptive control of a nonlinear mechanical by the Lyapunov Method. To analysis the stability of system the Lyapunov second method is presented and the desired signal is obtained from its algorithms. As a result the proposed nonlinear system by the Lyapunov Method provide some computer simulation to support stability margin.

Detection and Genetic Characterization of Isolates of Hepatitis E Virus from Pigs and Human in Chungnam Region of Korea

Chae, Mi-Kyung,Kim, Ji-Young,Chu, Jiaqi,Kim, Duck-Hwan,Yoo, Han Sang,Park, Chang-Sik,Kim, Myung-Cheol,Jun, Moo-Hyung 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10

Detection and Genetic Characterization of Isolates of Hepatitis E Virus from Pigs and Human in Chungnam Region of Korea

Chae, Mi-Kyung,Kim, Ji-Young,Chu, Jia-Qi,Kim, Duck-Hwan,Yoo, Han-Sang,Park, Chang-Sik,Kim, Myung-Cheol,Jun, Moo-Hyung The Korean Society for Microbiology 2006 Journal of Bacteriology and Virology Vol.36 No.1

Swine hepatitis E virus (HEV) has been reported as a new zoonotic agent due to its close genomic resemblance to the human HEV. Recently this virus is indicated as one of the important pathogens in xenotransplantation that uses pig as a donor animal. We carried out to investigate the prevalence of HEV infections among the pigs and human population in Chungnam region using a nested RT-PCR for detection of a part of HEV ORF2 gene. The sequences of the amplified DNA were analyzed and the genetical divergency were characterized. A total of 18 HEV strains, comprising 16 strains from pig and 2 strains from human, were genetically isolated from the fecal and serum samples. Among the isolates, 5 strains (2.5%) were detected from 200 swine sera and 2 strains (2.0%) from 100 human sera. All of the 16 swine strains were isolated from the pigs at 3 month of age, but none of age groups revealed the positive for swine HEV RNA. In comparison of the nucleotide sequence between 16 swine HEV and 2 human HEV isolates, the range of identities was 91.5% to 100%. Two human HEV isolates shared 99.7% homology. In phylogenetic analysis, all of the isolates were classified into genotype III, and the 18 isolates were also closely related to the prototype of swine HEV and human HEV strains isolated in the United States and others recently identified from swine in Japan and Netherland.

Copper-Based Compounds against Erwinia amylovora: Response Parameter Analysis and Suppression of Fire Blight in Apple

Duck Kyu Ryu,Mahesh Adhikari,Dong Hyuk Choi,Kyung Jin Jun,Do Hyoung Kim,Chae Ryeong Kim,Min Kyu Kang,박덕환 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.1

Fire blight, caused by Erwinia amylovora, is one of the major bacterial disease of apple and pear, causing enormous economic losses worldwide. Several control measures against E. amylovora have been reported till date, however, none of them have proved to be effective significantly against the pathogen. In this study, mechanisms of the copper-based control agents (CBCAs): copper oxychloride (COCHL), copper oxide (COX), copper hydroxide (CHY), copper sulfate basic (CSB), and tribasic copper sulfate (TCS) and their disease severity reduction efficacy against E. amylovora were analyzed. Bis-1,3-dibutylbarbituric acid trimethine oxonol, carboxyl fluorescein diacetate succinimidyl ester, and 5-cyano-2,3-ditolyl tetrazolium chloride staining were used to check the damage of membrane potential, cytoplasmic pHin, and respiration of CBCAs-treated E. amylovora, respectively. High disturbance in the membrane potential of E. amylovora was found under COX and COCHL treatments. Similarly, higher significant changes in the inner cytoplasmic pHin were observed under COX, COCHL, and TCS treatment. CHY and COCHL-treated E. amylovora showed a significant reduction in respiration. In vitro bioassay results revealed that CHY, CSB, and TCS at 2,000 ppm reduced the severity of fire blight both in pre- and post-treatment of CBCAs in immature apple fruits and seedlings. Overall, the most effective CBCAs against E. amylovora could be CHY at 2,000 ppm as its showed inhibition mechanisms and disease severity reduction.

應力集中된 剛板의 挫屈强度解析

채경덕 三陟大學校 1993 論文集 Vol.26 No.-

When the perforated plate is under in-plane load of compression, buckling analysis becomes to be necessary because of the presence of stress concentration around holes. To constrain it, we need reinforcement. The methods of reinforcement are ataching doubler around hole and attaching stiffener in the direction of initial stress. In this paper, two methods are investigated mentioned above, which of the two is better effective reinforcement. In the consequence of the above investigation, following conclusion was obtained. The method of doubler reinforcement was less bucking stress than that of stiffener because the former had large compressive stress. So, effective method of reinforcement is stiffener reinforcement.

피부 악성 흑색종의 임상 및 병리조직학적 소견

박경덕 ( Kyung Duck Park ),이석종 ( Seok Jong Lee ),이원주 ( Weon Ju Lee ),김도원 ( Do Won Kim ),정호윤 ( Ho Yun Chung ),조병채 ( Byung Chae Cho ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.2

Background: Malignant melanoma is the leading cause of death among skin cancers in western countries. The incidence of melanoma has been steadily increasing over the last 20 years, and age and sex distribution, anatomic location, clinicopathologic subtypes, and prognostic factors of malignant melanoma are also well known. However, various clinicopathologic aspects such as incidence, clinicopathologic subtypes and tumor behaviors are quite different in Asian and black skin. Objective: The purpose of this study was to investigate the clinicopathologic behavior and statistics of malignant melanoma patients of Kyungpook National University Hospital, and to evaluate prognostic predictors. Methods: Of the 97 out of 103 patients diagnosed with malignant melanoma at the Department of Dermatology of Kyungpook National University Hospital over a 14 year period (l992~2006), we analyzed mean age of onset, gender, tumor location, duration, tumor number, color, tumor thickness, Clark`s level, pathologic ulceration, tumor-infiltration lymphocytes, clinicopathologic subtype, and clinical AJCC stage. Univariate analysis and multivariate analyses for survival, according to clinical and histologic tumor settings, were performed by means of the Cox proportional hazard model. Survival curves were plotted by the Kaplan-Meier method. Results: Ninety-seven melanomas were identified and analyzed by both clinical behavior and pathology. Of these, 44 were male and 53 were female patients and the mean age was 59.7 years. Most of the tumors were located on the hands and feet. Thin melanoma was the most common tumor and histologic ulcerations were observed in 37 out of 81 patients who were available for evaluation. For tumor-infiltrating lymphocytes (TIL), 22 out of 76 patients were confirmed with TIL in the pathologic review. Acral lentiginous melanoma was the most common type, followed by nodular melanoma, superficial spreading melanoma, and lentigo maligna melanoma. Univariate analysis for overall survival of melanoma revealed that thickness of tumor, the presence of ulceration, the presence of tumor-infiltrating lymphocytes, clinicopathological subtype, and clinical stage have a tendency for a poorer prognosis. Multivariate analysis demonstrated that advanced stages (III and IV) and tumor thickness were the independent risk factors for poor prognosis. Conclusion: Few similar large studies have been conducted to assess the prognostic factors of melanoma in Korea. Therefore, further prospective studies are needed to assess the biological behavior of malignant melanoma, of which the incidence has been steadily increasing in Korea. (Korean J Dermatol 2007;45(2):149~158)