Investigation of the April 2000 forest fire damage in Kang-won Province, Korea, using RADARSAT data

Kang, Sung Chul,Seo, Jin Won,Lee, Tae Hee,Park, Sang Eun,Hong, Suk Young,Moon, Wooil M. 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1

The series of forest Fires in Kangwon Province in April, 2000, were one of the mast serious ones in the Kang-won Province in recent years. The fire damaged areas are extensive and this paper investigates the utility of the satellite image data, particularly the RADARSAT SAR data. One of the main objectives of this study included evaluation of potential usefulness of the C-band RADARSAT data in the detection of forest fires in mountainous areas. Among several fire damaged sites, the area near Samchuk (city) was selected as the main study area and mufti-temporal RADARSAT(raw) data were acquired and the processed results were comparatively investigated with the IRS-1c data acquired shortly after the fire. To identify the burnt area from the undamaged background in the optical imagery, supervised classification and NDVI processing were carried out and tested with the IRS-1C data. For this experiment, several sets of raw RADARSAT standard and Fine mode (S4, F3, ascending orbit) data were processed and the final image was formed. In addition to the final image, sigma nought (σ°) was catnputed and compared for the burnt area against the undamaged areas. Because of the steep slopes in the study area and subsequent deviation from the flat surface scattering models, the fire scars in the sigma nought (σ°) image were not apparent. However, fire scars are slightly detected in the difference and ratio images obtained from the signal intensity data acquired at different dates (bath before and after fire). Texture analysis of the image data including the burnt areas were carried out using the Multiplicative Markov Random-Field (MMRF) algorithm. The detection of the fire damaged area from both standard mode and fine mode RADARSAT was not as straightforward as in optical data. However, Previous studies with ERS-1 S_AR and RADARSAT data in Indonesia and in the North American Plains indicate that C-band SAR data provide us with an effective tool for studying the forest fire damages. However, the application of C-band SAR data to the analysis of the forest fire areas requires careful processing of the data with realistic scattering models.

水稻 이양전작(春播) 靑刈 옥수수의 경제성 조사

金基元,徐大振,姜奉泰 진주산업대학교 1972 論文集 Vol.9 No.-

1. The weather condition was good and the cost of producing 7,600Kg/wa of soiling corns was 3,911 Won 2. Appreciate value per Kg was 51 Won, labor-expense was 3,38won, fertilizer-expense 0,16 Won and productive quantity per invested labor-hour was 118Kg, 3. Forage quantity to purchase with the expense of soiling coiling corns sold is as follows:barley is 156,4Kg, corns are 88.3Kg, wheat bran is 165.7Kg, wheat 114.0Kg and nou-fatdrid ricebran is 23.42Kg. 4. After-farming growth and harvest quantity were not different, but the damage of disease was slightly more.

주요우울증이 근로자의 생산성에 미치는 영향 : WHO-HPQ(Health and Work Performance Questionnaire)를 이용한 예비연구

김원,황태연,함병주,이준석,최병휘,김세주,서용진,강은호,우종민 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

Objectives : Major depressive disorder (MDD) causes patients' distress and makes socioeconomic burden, both directly and indirectly. We used the concept of lost productive time (LPT) to estimate the indirect costs and calculated both absenteeism and presenteeism among workers with MDD. Mcthods : Depression group was recruited from workers visiting psychiatric outpatient clinic who had MDD without major physical or mental disorders (N= 106). Age and sex matched healthy control group was also recruited through advertisement (M=100). All participants completed a interview using WHO Health and Work Performance Questionnaire (HPQ), Job Stress Measurement Scale for Korean Employees, and Hamilton Rating Scale for Depression. Statistical analysis was performed with independent t-test or χ² test as characteristics of values (p=0.05). Results : The number of absence (0.94-day/month vs. 0.10-day/month, P=0.015) andthe numberofearly leaving (2.56-day/month vs. 0.24-day/month, P<0.001) were significantly higher in the depression group. Depression group evaluated their Perfor-mance level much lower than controls with significant value (5.16 vs. 7.62, P<0.001). In addition, depression group estimated their performance level during the last 4 weeks lower compared to the level of past 1-year (5.16 vs 6.63, P<0.001). The estimated costs of absenteeism in depression group were higher than controls by 2,520,000 Korean Won per year, and those of presenteeism were also higher by 4,880,000 Korean Won per year. The total costs of LPT in depression group were higher than controls by 7,400,000 Korean Won, which corresponds to 26% ofmean annual salary. In addition, the level of occupational stress, such as high demand and interpersonal conflict, was higher in the depression group. Conclusion : Major depressive disorder costs substantial productivity loss to workers and their company. Presenteeism imposes more time cost than absenteeism. Effectiveness trials are needed to devise cost-effective programs for the early detection and treatment of depression at the workplace.

신경망에 의한 확대 I-PD제어계의 구성

강동원,조재오,이현철,하홍곤,고태언 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-

Many control techniques have been proposed in order to improve the control performance of discrete-time domain control system. In the position control system using a DC servo motor as a driver, the response-characteristic of system is controlled by the I-PD controller. In the I-PD control system, the transient response characteristic is more increased and settling time gets longer if gains of I-PD controller are unsuitable. In this paper, a expanded I-PD control system is constructed by inserting a pre-compensator at output terminal of I-PD controller. it is implemented by neural network with two hidden layers. From the result of computer simulation in the proposed control algorithm, its usefulness is verified.

폴리스티렌 수지 재활용 관련 기술의 특허출원 동향분석

강태원,정진기 公州大學校 工學硏究院 生産技術硏究所 2004 論文集 Vol.12 No.-

In this paper the world wide patents on the recycle of used polystyrene was inspected. The trends and directions of on going and future technologies on this matter was analyzed. The range of search was limited in the open patents and in DB of U.S.A.(USPTO, DLPHION), Japan(PAJ), Europe(EPO), and Korea(KIPRIS). For the search condition the keyword, polystyrene or PS, and IPC classification were used and the total of 534 cases was found. The trends of the patents were analyzed by the years, from 1974 to 2002, the countries, companies, and technologies.

세라믹 종류에 따른 코어링 특성에 관한 연구

강용구,이태원,이종찬,최환 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-

A diamond core drill has been well carried out in the ceramics drilling. In this investigation, a vertical type machining center (MC) was used in the coring of Al₂O₃and Si₃N₄ceramics with a metal bonded diamond core drill. To clarify the mechanism of coring, the influences of coring conditions on the coring force, grinding ratio, succesive zone of coring were studied. At the wheel feed speed of 5.2 mm/min, and the wheel revolution of 3000rpm in Al₂O₃ceramics, the wheel speed of 2.7 mm/min, and the wheel revolution of 1500rpm in Si₃N₄ceramics, the best grinding ratio was obtained. But, from a viewpoint of coring speed, the wheel feed speed at 37 mm/min (Al₂O₃) and 10 mm/min (Si₃N₄) were best, when the coring depth was to 1 mm.

왜곡된 계전신호에서의 전력주파수성분 페이서 추출법

강상희,권태원 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-

A phasor extraction algorithm based on a modified least square error method which can be used for a high speed digital distance relay is proposed. To obtain stable phasor values very quickly, first, a lowpass filter which has very short transient period and no overshoot is used. Secondly, the conventional least square error method is modified to the one having the data window of 3 samples by applying a FIR filter which removes the DC-offset component in current relaying signals.

경사 유동층 반응기를 이용한 석탄의 건조 연구

강태원,정진기,김동국 公州大學校工科大學生産技術硏究所 1999 論文集 Vol.7 No.-

The goal of this research is in the development of process of drying high-moisture subbituminous coal using at inclined fludized bed(IFB). The Eagle Butte coal of AMAX company in Wyoming and Usibelli coal of Alaska were two feed coals tested in a 10-lb/hr bench-scale IFB for this research. The feed coals were crushed to minus 590μm(28 mesh) to produce an average particle diameter 70μm for the Eagle Butte coal and 80μm for the Usibelli coal as determined by wet screen analysis. IFB reactor slopes of 3, 6, 9, 12 and 15 degrees were investigated for each coal. The average temperature of IFB dryer were varied from 177 to 399℃ and the carbon fluidizing gas velocity ranged from 1 to 6 ft/min. The solids heating rate in the experiments varied from approximately 33 to 139℃/min, and solids residence times varied from 5 to 13 min. In all of the experiments, the dried coal product contained less than 1.5% moisture as determined by proximate analysis. As a result of drying and partial carboxylation, the heating value of coals were increased from 8,470 Btu/lb to a range of 11,800 to 12,600 Btu/lb for Eagle Butte coal and to a range of 10,400 to 11,500 Btu/lb for Usibelli coal.

탄소강재의 회전굽힘응력 하에서의 피로균열의 성장식과 수명예측

강용구,최환,이태원,이종찬 國立金烏工科大學校附設生産技術硏究所 1997 産業技術開發硏究 Vol.13 No.-

In this work, fatigue crack growth equations and Life Predition are studied. New exponential crack growth equation are presented to describe the crack growth behaviors from an artificial pit of three type carbon steels (G. J1 and J2) under rotary bending (R= -1). Crack growth curves obtained from new exponential crack growth equations are in good agreement with experimental data of carbon steels. Fatigue life predition are also carried out by numerical integral method. Predition lives using new exponential crack growth equations and 4th order polynominal crack growth equations are also compared with experimental results. Predition lives obtained from new exponential crack growth equation are in good agreement with the experimental ones. The difference between predition lives and experimental ones are not exceed ±10%. The other hand, in the case of using 4th order polynominal crack growth equations, the difference between predition lives and exprimental ones are exceed ±20%.

전악 치근단 방사선사진 촬영시 촬영조건에 따른 흡수선량 변화에 대한 연구

강미애,박태원 大韓口腔顎顔面 放射線學會 1995 Imaging Science in Dentistry Vol.25 No.2

This study was designed to meansure the absorbed dose to organs of special interest from full mouth with intraoral film(14 films) and to compare the five periapical techniques. Thermoluminescent crystals(TLD-100 chip) were located in brain, orbit, bone marrow of mandibular ramus, bone marrow of mandibular body, bone marrow of 4th cervical spine, parotid gland, submandibular gland and thyroid gland. X-ray machine was operated at 70kVp and round collimating film holding device(XCP) and rectangular collimating film holding device(Precision Instrument) were used. The distance from the X-ray focus to the open end of the collimator was 8 inch, 12 inch and 16 inch. The results were as follows : 1. The absorbed does was the highest in bone marrow of mandibular body(5.656mGy) and the lowest in brain(0.050mGy). 2. Generally, the lowest absorbed does was measured from 16 inch cylinder, rectangular collimating film holding device with paralleing technique. But, in bone marrow of mandibular body and the floor of mouth, the highest absorbed does was measured from 12 inch cylinder, rectangular collimating film holding device with paralleling techniques. 3. Comparing of five intraoral radiographic techniques, it was appeared statistically significant reduction of the absorbed does measured with rectangular collimating film holding device compared to XCP film holding device (P<0.05). 4. No statistically significant reduction in the absorbed does was found as cylinder length was changed(P>0.05).