고기능 전력변환 이중데드비트 전류 제어기

이진섭,정해덕,백형래 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1

This paper describes a new digital control system based on the model state equations and a prediction method of the load current for PLW inverter with DC link. A new technique used dead beat theory to obtain a sinusoidal PWM inverter output voltage with LC filter has been presented. The dead schemes possess one sample delay in theses controlled signal which can compensate by prediction of the reference wave of the load current at next sample time. Load current prediction which has quick response is applied to compensate the random and high frequency components. This proposed control inherently is verified vary good sinusoidal output wave synthesis of voltage and current, providing accurate phase positioning for various load and excellent transient response. The experimental implementation of the system uses a real time TMS320C31 DSP(Digita1 Signal Processor)based digital controller.

연속공정시스템의 고속 고정도 장력제어시스템

이진섭,백형래,이상일 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.1

This paper deals with the tension control of state feedback control for continuous processing line. At the starting point of entry section, for example, a unwinder named pay off reel unwinds the material maintaining constant tension and line speed. Speed and torque characteristics state is variance during acceleration and deceleration period. In simulation roll diameter variation and inertia variation are considered. It becomes clear that the proposed tension control system has high accuracy performance.

IGBT PWM 컨버터 시스템의 제어 특성에 관한 연구

이진섭,백형래 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

The problem of power factor and harmonics are occurred in converter system which used to SCRs and diodes a s power semiconductor devices. IGBT power device with self-commutation type was solved that problem, maintain the input line current with sinusoidal wave current of input power source voltage. It was estimated that improvement of transient state characteristics with feedforward compensator, added in the diode rectifier with single phase voltage type inverter was used to load. As a result it was verified that the transient state characteristics with voltage type PWM converter control was improved by simulation.

Cone beam형 전산화단층촬영법을 이용한 하악과두의 골변화에 관한 연구

이지운,김형섭,송주섭,김경아,고광준 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3

Purpose : To assess bone changes of mandibular condyle using cone beam computed tomography (CBCT) in temporomandibular disorder (TMD) Patients. Materials and Methods : 314 temporomandibular joints (TMJs) images of 163 TMD patients were examined at the Department of Oral and Maxillofacial Radiology, Chonbuk National University. The images were obtained by PSR9000N (Asahi Roentgen Co., Japan) and reconstructed by using Asahivision software (Asahi Roentgen Co.,Japan). The CBCT images were examined three times with four weeks interval by three radiologists. Bone changes of mandibular condyle such as flattening, sclerosis, erosion and osteophyte formation were observed in sagittal, axial, coronal and 3 dimensional images of the mandibular condyle. The statistical analysis was performed using SPSS 12.0. Intra-and interobserver agreement were performed by 3 radiologists without the knowledge of clinical information. Results : Osteophyte (2.9%) was found more frequently on anterior surface of the mandibular condyle. Erosion (31.8%) was found more frequently on anterior and medial surfaces of the mandibular condyle. The intraobserver agreement was good to excellent(k=0.78-0.84), but interobserver agreement was fair(k=0.45). Conclusion : CBCT can provide high qualified images of bone changes of the TMJ with axial, coronal and 3 dimensional images.

忠北地域의 배추좀나방 系統에 대한 殺蟲劑에 관한 硏究

金舜燮,李炯來 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2

The experiment was carried out by the spray method to investigate the insecticidal resistance of the susceptible and the collected strains of the diamondback moth, DBM(Plutella xylostella L.)in Chungbuk Province. The results are summarized as follows. 1.In Chlorpyrifos, the LC50 values(ppm) of the susceptible(s-strain), Cheongwon, Ockcheon, Boeun, Jungwon, Koesan, Yeongdong and Jewon strains were 11.5, 18.2, 39.8, 42.2, 141.6, 154.0, 173.8, and 224.9, respectively. The resistance of the Jewon strain was 19.6 times greater than that of the s-strain. 2.In Methomyl, the LC50 values(ppm) of the susceptible, Cheongwon, Boeun, Jewon, Koesan, Jungwon, Ockcheon and Yeongdong strains were 0.94, 57.1, 83.0, 97.4, 148.6, 240.8, 286.9 and 512.4, respectively. The Yeongdong strain showed the highest resistant level among the collected strains. The LC50 values of the Yeongdong, Ockcheon, Jungwon, Koesan and Jewon strains were at least 100 times greater than that of the s-strain. 3.In Carbaryl, the LC50 values(ppm) of the susceptible, Ockcheon, Boeun, Koesan, Yeongdong, Jewon, Cheongwon, and Jungwon strains were 36.3, 69.6, 141.3, 256.3, 269.9, 884.9, 2224.8 and 34 14.3, respectively. The LC50 values of the Jungwon strain was 94.1 times greater than that of the s-strain. 4.In Deltamethrin, the LC50 values(ppm) of the susceptible, Boeun, Ockcheon, Cheongwon, Yeongdong, Jewon, Jungwon, and Koesan strains were 9.3, 23.8, 30.9, 31.4, 52.0, 55.9, 67.4 and 99,6, respectively. The LC50 value of the Koesan strain was 10.7 times greater than that of the s-strain. 5.In Fenvalerate, the LC50 values(ppm) of the susceptible. Yeongdong, Jungwon, Boeun, Cheo-ngwon, Koesan, and Jewon strains were 9.7, 44.4, 72.1, 78.5, 92.0, 186.8 and 245.1, respectively. The LC50 value of the Jewon strain was 25.2 times greater than that of the s-strain. 6.In Cartap, the LC50 values(ppm) of the susceptible, Ockcheon, Koesan, Yeongdong, Jungwon, Boeun, Jewon, and Cheongwon strains were 18.5, 24.3, 25.8, 119.3, 128.5, 130.2, 132.6 and 384.0, respectively. The LC50 value of the Cheongwon strain was 20.7 times greater than that of the s-st-rain.

림프질 전이가 있는 하인두암과 하부식도암의 진단에 활용된 내시경초음파 유도하 Trucut 생검 1예

광명옥,이정환,문정섭,김유선,류수형,총배천,김형훈,김현태 仁濟大學校 白病院 2010 仁濟醫學 Vol.31 No.-

The incidence of double primary cancer is about 10% in all kinds of cancers. Double primary cancer is usually accompanied by gastrointestinal cancer. Esophageal cancer is supposed to be frequently accompanied by squamous cell carcinoma of the head and neck or the upper respiratory tract, because of such common carcinogens as smoking and alcohol ingestion. Esophageal cancer and hypopharyngeal cancer are usually diagnosed by esophagogastric endoscopy with biopsy. We performed endoscopic ultrasound-guided Trucut biopsy(EUS-TCB) to diagnose a mediastinal mass in a 49 year-old patient, who visited our hospital because of voice change. During procedure, we accidently found enlarged celiac lymph node, and obtained tissue from the mediastinal lymph node and the celiac lymph node. We confirmed double primary cancer of squamous cell carcinoma in the esophagus and the hypopharynx via esophagogastric endoscopy.

소음·진동에 따른 참전복(Haliotis dissus hannai)의 행동·생태학적 변화

최상덕,정형택,윤호섭,안치영,이삼노,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

These days, the underwater excavation and the piling work have been commonly used to reclaim land and to build a breakwater. As the piling work generates high underwater sound pressure in all direction, various kinds of marine organisms are largely affected even if they live a long distance from the piling work. Therefore, this paper describes the relationship between the behavior of abalone(Haliotis discus hannai) of 50cm long and the environmental noise level with vibration due to the piling work. We have separated the research into two parts. The one is continuance impact, the other is intermittent impact. The following are the results obtained from the present investigation: Comparing 0.5cm/sec vibration with 50dB noise and 0.9cm/sec vibration with 60dB, the previous one show a faster reaction speed than the later one. Futhermore the later one showed that pulling up on their shell, in order to avoid the epidemic, moving around, small organisms are included to hide under big organisms, alerting posture. However we couldn't find a consistent standard in our research.

지렁이를 이용한 슬러지 안정화시 부하율의 영향 및 슬러지 종류별 안정화 가능성 검토

서성철,박종안,이노섭,배형석,이종화,허준무,김준현 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2

Stabilization of organic sludges using earthworms was conducted in a laboratory to investigate the effect of feed rate on the vermistabilization, and feasibility of vermistabilization of various sludge was also carried out to further wider application of vermistabilization. Sludges used in this study were septic tank sludge, papermill sludge and brewery sludge. Sludge reduction, cast production, earthworm growth rate and cocoon production were monitored periodically to check degree of stabilization. Feed rate of septic tank sludge did not have a notable effect on the sludge reduction and cast production per unit weight or earthworm. There was also no difference in the earthworm growth rate per unit weight of the sludge removed among the different sludge feed rate. The amount of septic tank sludge, papermill sludge and brewery sludge per gram of earthworm per day were 0.06, 0.05, and 0.02g, respectively. The weight of increase of earthworm per unit weight of the sludge removed was 0.18g/g for the septic tank sludge, 0.21g/g for the papermill sludge, and only 0.06g/g for the brewery sludge. It was therefore concluded that brewery sludge was not suitable for vermistabilization mainly due to high organic content to be easily converted organic acid. The concentrations of several heavy metals, volatile solids, total organic carbon and total kjeldahl nitrogen in the cast were generally lower than those in the raw sludges.

가막만에 분포하는 대형저서동물의 계절적 분포 및 출현

최상덕,문성용,안치영,윤호섭,정형택,이삼노,서호영 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

This study was coducted to describe the distribution and appearance pattern of macrobenthos in Kamak Bay, the southern coastal of Korea. Sampling was perfound seasonally using Van Veen grab(0.1㎡) from April 2001 to December 2001. A total of 22 macrobenthic species occured: Bivalvia accounted for 12 species(55%), and Mollusca 5 species(23%). The mean density of macrobenthos was 153.9ind./㎡, a major dominant species were a Bivalvia, Paphia undulata(28.3ind./㎡), and a Cirripedia, Chthamalus challengeri(5ind./㎡), which frequency occur in the costral area. These species showed very low density at station 1 in the Kamak Bay.

온도; pH, 염분 내성 및 충격이 개불, Urechis unicinctus 유생에 미치는 영향

최상덕,김호진,라성주,정형택,윤호섭,신종암,이원교 國立 麗水大學校 環境問題硏究所 1999 環境硏究論文集 Vol.2 No.-

The effect of different temperature, salinity and pH on survival rate of Urechis unicinctus's swimming embryo was examined to develop the method for the efficient seed production. In addition to, this study was designed to investigate the possibility of pollutant marker diagnosis of marine pollutions by the change in different temperature, salinity and pH. Treatment was carried out whit different temperature (5˚C, 10˚C, 17˚C, 20˚C, 25˚C,), salinity(0‰, 10‰, 20‰, 30‰, 34‰, 40‰) and pH(4, 6, 7.2, 8.2, 9.2, 10). All the swimming embryo of the temperature experiment was survived within all experiment section, but the others experiment were not. At the temperature-shock and tolerance experiment ranging from 5˚C to 25˚C the survival rate was occurred: 75%, 95%, 100%, 100%, 50%, at the ph-Shock experiment ranging from 4 to 10, the survival rate was occurred: 0%, 50%, 85%, 100%, 60%, 0%, at the pH-tolerance experiment ranging 4 to 10 the survival rate was occurred : 0%, 75% 90%, 100%, 80%, 0%, and at the salinity-shock experiment ranging from 0% to 40% the survival rate was occurred : 0% 10% 90% 95% 100% 0% , at the salinity-tolerance experiment ranging from 0% to 40% , the survival rate was occurred : 0% 0% 90% 100% 100% 0%. These results suggest, that the survival rate of larvae of Urechis unicinctus was the highest at 17˚C, 34%. pH8.2 and this Urechis unicinctus could be live at the zone of euryceious and zone of euryhalines