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서남해 해상풍력 실증단지에서 조류의 분포, 비행고도 그리고 서식지 이용
임재균,김정수,진승종 한국풍력에너지학회 2023 풍력에너지저널 Vol.14 No.4
We observed five species and 163 individuals of birds in the Demonstration Offshore Wind Farm in the southern part of the West Sea in Korea, and 33 species and 4,023 individuals from Gusipo to Dongho Beach. The most dominant bird in both areas was the black-tailed gull, Larus crassirostris. The flight height of birds for collision risk (wind turbine and bird) was divided into two groups. First, the safe height was from sea level to 20 m (< 20 m), with no effect from the action of revolving blades. Second, the danger height was more than 20 m from sea level (> 20 m), with a collision risk from the action of revolving blades. Birds flying a safe height (< 20 m) were 83.9% (271 individuals) and danger height (> 20 m) were 16.1% (52 individuals). Also, 11.7% of birds (35 individuals) used the inside of the Demonstration Offshore Wind Farm as a habitat for foraging and resting, and 88.3% birds used the outside. We suggest that the risk of collision with the wind farm was low due to the relatively low flight height of birds and distance between wind turbines (> 800 m).
하부요로증상을 가진 남성 환자의 요역동학검사 소견 및 술 전 검사소견이 경요도전립선절제술의 결과에 미치는 영향
임재균,김준철,황태곤 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.12
Purpose: We tried to find out the urodynamic features of the male patients suffering with lower urinary tract symptoms(LUTS) and we wanted to know the effects of the preoperative parameters on the outcome of transurethral resection of the prostate(TURP). Materials and Methods: One hundred ninety four patients who had LUTS and who had undergone urodynamic study were available for analysis. The history taking and physical examination, urinalysis, International Prostate Symptom Score(IPSS), transrectal ultrasonography, serum prostate-specific antigen(PSA) level check and urodynamic study were performed for all the patients. Also, the postoperative IPSS and satisfaction level were accessed for the patients who had undergone TURP for bladder outlet obstruction(BOO), and the preoperative factors such as age, prostate volume, PSA and urodynamic findings were analyzed. Results: For the total 194 patients, there were 123 BOO patients(63.4%), 62 detrusor overactivity patients(13.4%) and 19 detrusor underactivity patients(9.8%). For the patients who had undergone TURP, the IPSS was decreased from a preoperative value of 20.5 to a postoperative value of 9.0. We divided the patients into two groups in accordance with the level of satisfaction after the operation. Within the two groups, the dissatisfied group showed a preponderance of preoperative detrusor overactivity. When performing IPSS, both groups showed a decreased score with each having a different range: from 20.8 to 6.1 in the satisfied group, and from 23.2 to 14.8 in the dissatisfied group. Conclusions: BOO is most common cause among the male patients who have LUTS and who are more than 50 years old, but other causes should be considered. Moreover, if BOO accompanies detrusor overactivity, the importance of the preoperative urodynamic findings deserves emphasis, and it will help to predict the results of performing TURP.
Carbon Rich 분위기에서의 KHR45강의 침탄특성 평가 연구
임재균,양기모,임영언,Lim, Jae Kyun,Yang, Gimo,Ihm, Young Eon 한국재료학회 2013 한국재료학회지 Vol.23 No.5
In this study, an HP-mod. type(KHR-45A), which is used as a heater tube material in the pyrolysis process, was evaluated for its carburizing properties. It was confirmed from the microstructural observation of the tubes that the volume fraction of carbide increased and that the coarsening of Cr-carbide generated as a degree of carburization increased. The depth of the hardened layer, which is similar to the thickness of the carburized region of each specimen, due to carburization is confirmed by measurement of the micro-Vickers hardness of the cross section tube, which thickness is similar to that of the carburized region of each specimen. Two types of chromium carbides were identified from the EBSD (electron back-scattered diffraction) image and the EDS (energy-dispersive spectroscopy) analysis: Cr-rich $M_{23}C_6$ in the outer region and Cr-rich $M_7C_3$ in the inner region of tubes. The EDS analysis revealed a correlation between the ferromagnetic behavior of the tubes and the chromium depletion in the matrix. The chromium depletion in the austenite matrix is the main cause of the magnetization of the carburized tube. The method used currently for the measurement of the carburization of the tubes is confirmed; carburizing evaluation is useful for magnetic flux density measurement. The volume fraction of the carbide increased as the measuring point moved into the carburized side; this was determined from the calculation of the volume fraction in the cross-section image of the tubes. These results are similar to the trends of carburization measurement when those trends were evaluated by measurement of the magnetic flux density.