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企業 附設 硏究所 活動實態에 관한 硏究 : 釜山·慶南地域을 中心으로
河正鎭,黃圭完,申大赫,兪炳哲 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2
The research institute of an enterprise attaches have been enlarged in korea. This study grasps the status and the research activity in the research institute of an enterprise attached in the Pusan and Kyungnam. So, we find the important role in the research institute of a enterprise attached.
Case report of a pancreatic squamoid cyst
Dae-Gwang Yoo,Shin Hwang,Dae-Wook Hwang,Ki-Hun Kim,Chul-Soo Ahn,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Sung-Gyu Lee 한국간담췌외과학회 2013 한국간담췌외과학회지 Vol.17 No.4
Squamoid cyst of the pancreas is a very rare disease and it has been proposed only recently as a distinct pathologic lesion. We herein present a case of pancreatic squamoid cyst in a patient who underwent laparoscopic resection. A 60-year-old woman had an abdominal computed tomography (CT) scan for a routine check-up, and a multi-cystic lesion of 1.8-cm in size was incidentally found in the tail of the pancreas. Biochemical laboratory tests were within normal limits. At first, we presumed that the most likely diagnosis of the cystic lesion was an intraductal papillary mucinous neoplasm. To treat this lesion, we performed laparoscopic spleen-saving distal pancreatectomy. The patient showed the usual routine postoperative course and she was discharged 10 days after surgery. On examination of the resected specimen, a well-defined, oligolocular cystic mass was found in the pancreatic tail, without a solid portion. Histologic examination revealed that the cysts had linings ranging from flat squamoid cells to transitional cells with non-keratinization. After immunohistochemical staining, the final diagnosis was confirmed to be squamoid cyst of the pancreas. This lesion appears to be regarded as a benign entity, thus an extended operation should be avoided and resection of the lesion can be performed minimally.
상속 소프트웨어 시스템을 CORBA 환경에서 재사용하기 위한 객체 포장 기법의 설계 및 구현
황규대(Gyu Dae Hwang),김현수(Hyeon Soo Kim) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅰ
상속(Legacy) 소프트웨어 시스템은 오랜 기간 사용되었고 충분히 검증된 안정적인 서비스를 현재까지도 제공하는 유용한 시스템이다. 새로운 분산 객체 환경에서 기존의 시스템에서 제공하는 서비스를 사용하기 위한 방법으로, 기존 시스템을 대체할 새로운 시스템을 개발하는 방법과 기존 시스템의 코드를 수정하는 방법과 기존 시스템을 객체 포장기법으로 포장해서 사용하는 방법이 있다. 본 논문은 이 중에서 기존 시스템을 객체로 포장하여 분산 객체 기술인 CORBA 환경에서 이 시스템을 재사용 하는 방법에 대하여 연구한다. 이 과정에서 다양한 형태의 인터페이스를 가진 기존 시스템을 효과적으로 포장할 수 있는 방법으로 LWR(Legacy Wrapping Rule)을 제안하고, 랩퍼(Wrapper)인 구현 객체 클래스를 만드는 랩퍼 생성기를 구현하였다. 이렇게 함으로써 상속 시스템을 보다 쉽고 강력하게 분산 환경으로 이주시킬 수 있다.
생슬러지의 초음파 조사에 의한 BNR공정의 탄소원 타당성 연구
황규대 ( Hwang Gyu Dae ),강재순 ( Kang Jae Sun ),장준기 ( Jang Jun Gi ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
In the sonochemical reaction, the solid of sludge can be disintegrated and solubilized by hydromechanical shear force, pyrolysis, and free radical attack during the cavitation. This study was performed to evaluate the feasibility of ultrasonically treated raw sludge as carbon source for biological denitrification and phosphate release. A 530W ultrasonic processor with a frequency of 40kHz was used to sonicated the raw sludge from wastewater plant. To find the optimal SCODcr buildup condition. we examined the effects of solid concentration of sludge, ultrasonic density, irradiation time, aeration, and pH on TSS and SCODcr concentration during the ultrasonic irradiation on raw sludge. Ultrasonic irradiation was applied to raw sludges with different solid contents (1, 3, and 5%.) and different ultrasonic density (0.04, 0.06, and 0.12W/rnl). Ultrasonic irradiation showed a rapid and significant decrease in TSS concentration in raw sludge. The kinetic of the degradation rates of TSS by ultrasonic irradiation was satisfactorily described by a pseudo-first order reaction. The degradation efficiency of solid in raw sludges were over 60%, and ranged from 3.0 to 7.2 ㎎TSS/W . hr. Also the SCODcr yields of 2.1 -3.2 ㎎SCODcr/W·hr in this study were observed and depended strongly on ultrasonic density. With aeration. the sonication on raw sludge further increased SCODcr concentration. However, it is less effective to irradiate ultrasonically the pH-adiusted raw sludge. The optimal operating condition to increase soluble organics was to sonicate the sludge with 5% TSS under the ultrasonic density of 0.12W/ml and showed the yield of 3.2 ㎎SCODcr/W . hr. Also the sonicated sludges with different sonication time(ranging between 0-9hrs) under 0.I2W/ml were fed into the batch reactors as carbon source. Those ones had a strong influence on the denitrification rate and the P-release concentration. The specific denitrification rates of batch reactors varied within a range from 0.46 to 1.97 mgNO₃-N/gVSS·hr, and 1.33-1.85 gSCODCr consumed/gNO₃-N removed was observed. The concentration of phosphate which was released by poly P microbes were in the range of 0-4.75㎎/L. and 0.55-1.22gPO₄-P released /gSCODcr consumed was showed. The economically most competitive sludge as carbon source was one under 3hr sonication time to accomplish the high denitrification rate and the P-release concentration. Therefore, the ultrasonically treated sludge can be another carbon source for BNR process.
축산폐수 전처리를 위한 암모니아 탈기공정의 운전조건이 암모니아 제거에 미치는 영향
황규대 ( Hwang Gyu Dae ),조영무 ( Jo Yeong Mu ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.1
Lab-scale experiments have been carried out to investigate ammonia stripping with a modified spray tower for removing ammonia nitrogen from swine wastewater. The operating conditions such as initial pH, temperature, air flow, hole size of distributor determining the diameter of water drops, and influent solids concentration were closely examined focusing on removal efficiency of ammonia. As a result of the experiment, in order to achieve high rate of ammonia removal by the air stripping system the air flow rate must be supplied at high rate with sufficiently high initial pH, temperature. The optimum operating condition to meet the residual ammonia concentration of 300 ㎎/L was the initial pH of 1 1.0 at 35 ℃ with the air flow rate of 20 L/min. It also showed that the smaller hole size is, the higher removal rate of ammonia is expected. However, when used a small sized distributor (2 ㎜), the flooding problem at the upper column occurred due to clogging of the hole. With regard to the influent solids concentration, it was showed that the lower concentration of solids, the higher removal rate of ammonia. The removal of particulate materials in influent led to improve the removal efficiency of ammonia, rather than to control the operating condition including initial pH, temperature, and air flow. The empirical correlation between KLa and operating parameters would be driven as, K_(La) = (0.0003 T- 0.0047)·G^(0.3926) ·L^(-0.5169)·C^(0.1849). The calculated K_(La) from proposed formula can be used effectively to estimate the optimum reaction time and to calculate the volume of modified spray tower system.
윤덕로,강대희,이승준,주영수,박진구,황호영,황필규,황은주,황예원,성주헌,홍순범,황승식,황재욱,조수헌 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.1
Industrialization has introduced various working systems into the modern society. Shift work is a good representative among those. So far various adverse health effects, possibly caused by this shift work, have mainly been reported in the fields of manufacturing industry by many other researchers ; sleep disorders, gastrointestinal disorders and cardiovascular disorders and so on, These health effects were thought to be caused by the changes of circadian rhythm on shift working. This study was especially planned to evaluate effects of shift work on sleep disorders among shift-working medical manpower like hospital nurses, important persons dealings with lives, and ultimately to provide them with basic evidence for improving work environment. The study subjects were arbitrarily selected among shift-working female nurses and day-working female pharmacists in one university hospital in Seoul, and finally 79 nurses and 58 pharmacists were enrolled. The research was conducted by using self-administered questionnaire, consisting of items about socio-behavioral factors including demographic factors which can affect sleep patterns and questions which make it possible to evaluate sleep disorders(e.g. sleeping duration, sleep latency, re-sleep latency, days of insomnia per week, drug use for sleep, and subjective symptoms). The result showed that the shift workers had significantly longer sleep and re-sleep latency, more days of insomnia, and a stronger likelihood of using drugs when they had sleep difficulty than day-working pharmacists. And the number of night shift duties per month was discovered as the only significant predictor of sleep latency. Additionally, the subjective symptoms related to sleep disorders when awake and at work, showed negligible differences between the shift workers and dayworkers. In conclusion, we found shift-work was risk factor for sleep disorders.