프랙탈 코딩 파라미터를 이용한 디지털 영상 워터마킹

고성식,조강석,정용덕,김정화 조선대학교 전자정보통신연구소 2003 電子情報通信硏究所論文誌 Vol.6 No.1

In this paper we propose new watermarking method that a secret key is created from image contents without inserting an watermark in the image contents and the watermark is transformed to the fractal parameters Image logo watermark uses the owner photograph of the image contents and after image watermark is transformed t o the fractal parameter between domain and range of the watermark logo by using fractal theory, the fractal parameter is scrambled by the created secret key Thus, our algorithm proposed in this paper has no image distortion by an watermarking because of decoding the watermark by the created secret key Experimental results have shown that the proposed method achieves improved robustness with respect to image lossy compression, cropping attacks and various filtering attacks.

제주 한동-송당 지구 해수침투 관측정 지하수의 층별 동위원소 및 지화학적 특징

송성준,고기원,박윤석 제주대학교 방사능이용연구소 2006 방사선응용과학연구소논문집 Vol.20 No.-

외상성 횡격막 손상

안성국,이상목,이기형,고석환,김용호,박호철,고영관,조규석 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Fifty two cases of traumatic diaphragmatic injuries that we have experienced from Jan. 1973 to Oct. 1994 were evaluated. The following results were obtained. The age of the patient was ranged from 1 to 74 years. Male was 38 and female was 14 in number with a ratio of 2.7 : 1. The traumatic diaphragmatic injuries were due to blunt trauma in 35 cases(motor vehicle accident 25, fall down 8, press 1, kick by fight 1) and penetrating trauma in 17 cases(stab wound 15, shot wound 1, explosion 1). In the blunt trauma, the preoperative diagnosis of the diaphragmatic injury was possible in 25 out of 35 cases(71%) and in the penetrating trauma, 15 out of 17 cases(88%). In the blunt trauma, the repture site was located in the left in 22 cases(63%) and in the right in 13 cases(31%). In the penetrating trauma, the rupture site was located in the left in 9 cases(53%) and in the right in 8 cases(47%). In the blunt trauma, 20 cases(63%) were treated within 24 hours and in the penetrating, 15 cases(88%) within 24 hours. In the blunt trauma, the herniated organs into the thorax were stomach(7), omentum(6), spleen(6), liver(5), colon(4), small bowel(2) and in the penetrating, stomach(7), colon(6), omentum(3), liver(2), and spleen(1) were herniated. Injury severity score(ISS) of 35-blunt trauma ranged from 11 to 66 with mean value of 30.6. Mean ISS of survivors and nonsurvivors was 27.6 and 52.7 respectively. The diaphragmatic repair of 49 cases was performed with thoracic approach in 23 cases, thoracoabdominal approach in 7 cases and abdominal approach in 19 cases, and 3 cases were not operated. The postoperative complication and mortality were developed in 16 out of 49 cases(33%) and in 5 cases(9.6%) respectively, and the causes of death were hypovolemic shock(1), combined head injury(2), asphyxia(1), and pulomnary edema and renal failure(1). In conclusion, the injuries of the diaphragm should be suspected in all patients with severe blunt trauma or penetrating injuries at thorax and upper abdominal area near the diaphragm. All of the cases had associated injury and most of deaths were related to the severity of associated injuries.

농가용 저온저장고의 제어변수에 따른 성능평가

김석우,김성만,현명택,최동호,고정삼,박영하 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

The low temperature storage method has been used to increase the value of agricultural products by reducing quality deterioration and controlling respiration rate. The respiration rate of agricultural products depends on several factors such as temperature, moisture, gas composition and microbe inside the storage room. Among that temperature is the most important factor, which affects respiration rate and causes severe damage. The results obtained from these experiments are that electric consumption is decreased as setting temperature is decreasing and temperature deviation is increasing. In the ventilation experiment, the case ventilated four times a day(every six hours a day) with ten minutes operation each time, was inspected require as much electric consumption as non-ventilation case.

저장물의 적재방법에 따른 저온저장고의 열성능 분석

김석우,김성만,현명택,최동호,고정삼,박영하 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

The heat performance in a forced circulating cool storage room was numerically investigated. A commercial PHOENICS package was used to simulate 3-D airflow. For solving the governing equations a standard k-ε turbulent model was implemented to calculate steady state turbulent velocity and temperature distributions. The results show that the large air contacting area of products increases the storage quality, because the airflow between products helps to remove the heat from the products by convective heat transfer.

복부 결핵으로 발현된 후천성 면역 결핍증 1예

고병성,김상중,유경화,이경한,노기탁,허원석 이화여자대학교 의과학연구소 2015 EMJ (Ewha medical journal) Vol.38 No.3

The incidence of tuberculosis (TB) had gradually been declining all over the world, but in recent years, TB has been increasing due to the spread of the human immunodeficiency virus (HIV). When immune-suppression status deteriorates further, extrapulmonary TB generally appears more often. Abdominal TB is one type of extra-pulmonary TB, which may involve the gastrointestinal tract, peritoneum, lymph nodes or solid viscera. We encountered a case who had initially been diagnosed as having abdominal TB, had progressed to acute respiratory distress syndrome and was eventually confirmed as having developed acquired immune deficiency syndrome. In cases of coinfection of TB and HIV, it is reported that immunological responses become poor and complications with higher morbidity frequently occur. Therefore, the Korean guidelines for TB should be revised to ensure whether HIV infection exists in TB patients.

후하소뇌동맥 동맥류에 의해 유발된 안면경련

최석근,이봉암,고준석,임영진,김국기,김태성 경희대학교 2004 慶熙醫學 Vol.20 No.1

대장암 근치적 절제술후 재발양상에 관한 임상적 연구

이길연,홍성화,고석환,윤충,고영관,이기형,박주철 대한대장항문학회 1996 Annals of Coloproctolgy Vol.12 No.2

플라즈마 반응기를 이용한 실내공기중의 NOx 제거

박재윤,손성도,고희석,박상현 경남대학교 공업기술연구소 2000 硏究論文集 Vol.18 No.-

인간은 하루 중 대부분의 시간을 다양한 형태의 위협적인 환경오염의 요인들이 있는 가정, 사무실, 공장, 지하 시설물 등과 같은 폐쇄된 실내공간에서 생활하고 있다. NO 가스는 저농도에서도 인체에 커다란 해를 끼치므로 이를 제거하기 위한 새로운 기술을 적용한 공기 정화기가 절실하게 요구되는 실정이다. 따라서, 본 연구에서는 여러 가지 형태의 플라즈마 반응기와 각종 파라메타의 변화에 따른 실내공기중의 NO 제거 효율을 측정하였다. 실험에 사용된 파라메타는 자계의 유무, 반응기 형태, 전원 및 초기농도에 따른 NO 제거율을 비교하였다. 모든 반응기 형태에서 자계를 인가했을 때가 인가하지 않았을 때 보다 NO 제거효율이 증가하는 것으로 나타났으며, AC전원에서 약 20[%], DC전원에서 약 10[%]이상 증가되었다. 그리고, DC전원보다는 AC전원에서 제거율이 높게 나타났으며, 초기농도가 낮을수록 제거율이 높게 나타났다. 반응기 형태에 따라서는 wire-cylinder type이 가장 제거율이 좋은 것으로 나타났다. In this paper, NOx removal efficiency from indoor air was measured for the four types of plasma reactor. The variation of NO removal rate was compared with experimental condition, such as magnetic field, reactor type, voltage type and NO concentration. NO removal rate in the reactor applied magnetic field was shown higher than that in the reactor without magnetic field. NO removal rate with magnetic field was high by 20[%] for AC voltage and was high by 10[%] for DC voltage and AC voltage was better than DC voltage for NO removal. When the flow rate of gas was increased. NO removal rate decreased.

부산지역 워터프런트의 기후특성에 관한 연구

도근영,이한석,고성철,현번수,유종수 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.2

워트프런트는 도심 및 내륙지역과는 다른 독특한 기후특성을 가지고 있으며 이를 고려하지 않고 개발할 경우 시설물의 하자발생, 에너지 및 유지관리비용의 상승을 초래하게 됨은 물론 배후지, 도시기후에 악영향을 미치게 된다. 본 연구는 부산지역의 10개 기상관측지점을 해안선에서 거리에 따라 워터프런트 및 내륙지역으로 분류하고 5년간의 기상데이터를 이용하여 워터프런트의 기후특성에 대해 검토한다. 또한 원터프런트지역임에도 내륙지역과 유사한 기후특성이 나타나고 있는 대연지점을 대상으로 기후특성변화의 원인에 대해 검토한다. The waterfront has distinct climate characteristics different from urban or inland area. These may create not only the rise of energy and maintenance costs for facilities located at waterfront areas, but also negative effects on the climate of the nearby inland area, unless these are treated with particular care. For the present study, the climate characteristics of waterfront were examined with climate data of 10 observation points carefully selected in Busan area. Each weather observation point was classified into either waterfront area of inland area, based on the distance from the coastal line. Special considerations were given to the climate data gathered at the Dae-Yeon weather station because it shows the climate characteristics similar to those of inland area although it is located very near the waterfront area. Results indicates that this peculiar climate condition attributes, at least in part, to the reclamation of frontal coastal area.