• 한국환경과학회지
• /
• 제7권1호
• /
• pp.74-80
• /
• 1998

Because permeate flux was very low as It has the suspension soled of higher concentration In the trafiltration membrane separation treatment of dyestuff wastewater, pre-treatment of Ponton reaction was carried out. In the case of pH 3, COD removal rate was the hi각erst of 58%. When PAC was added into the pre-treatment supernatant, the COD removal rate was found to be 53% , and when COD was 153mg/L, the removal rate was 92.3% in the trafiltration separation. In addition, the effect of the addition of PAC on the permeate flux was also investigated. The decrease of permeate flux In the presence of PAC was higher than In the abscence of PAC, but the recovery of permeability by cleaning was better In the case of PAC system.

• 지식경영연구
• /
• 제1권1호
• /
• pp.81-90
• /
• 2000

This study proposes the knowledge discovery process for the effective mining of knowledge on the web. The proposed knowledge discovery process uses the Prior knowledge base and the Prior knowledge management system to reflect tacit knowledge in addition to explicit knowledge. The prior knowledge management system constructs the prior knowledge base using a fuzzy cognitive map, and defines information to be extracted from the web. In addition, it transforms the extracted information into the form being handled in mining process. Experiments using case-based reasoning and neural network" are performed to verify the usefulness of the proposed model. The experimental results are encouraging and prove the usefulness of the proposed model.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제43권2호
• /
• pp.106-114
• /
• 2017

Osteoid osteomas are benign skeletal neoplasms that are commonly encountered in the bones of the lower extremities, but are exceedingly rare in jaw bones with a prevalence of less than 1%. This unique clinical entity is usually seen in younger individuals, with nocturnal pain and swelling as its characteristic clinical manifestations. The size of the lesion is rarely found to be more than 2 cm. We hereby report a rare case of osteoid osteoma originating from the neck of the mandibular condyle that grew to large enough proportions to result in conductive hearing loss in addition to pain, swelling and restricted mouth opening. In addition, an effort has been made to review all the documented cases of osteoid osteomas of the jaws that have been published in the literature thus far.

• 한국농공학회논문집
• /
• 제47권1호
• /
• pp.43-50
• /
• 2005

This test was performed to evaluate the change of the unconfined compressive strength, strength parame¡?ters which resulted from direct shear test and oil residue percents analyzed by GC-MS as time lapse, oil addition. Unconfined compression strength of $10\%$ kerosene added by weight of dry soil recovered as time passed. In the case of $5\%$ kerosene added, the strength recovered as much as clean clayey soil after about 50 days passing. For the case of diesel added, the recovery of unconfined compressive strength was not shown even though about 60 days passed. The strength parameters (c, $\psi$) of kerosene added not changed but for diesel added, the cohesion was very decreased as diesel addition increased. Residual percent of kerosene in the soil was less than that of diesel as time passed.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2019년도 추계학술발표대회
• /
• pp.149-152
• /
• 2019

반려동물 기르는 1인 가구가 증가함에 따라 여건도 관리하기 쉽게 발전되어져야 하지만 아직까지는 더딘 상황이다. 1인가구의 경우 약속, 야근 등 예기치 못한 상황 발생 시 먹이 급여에 있어서 어려움을 겪는데 이를 해결하기 위해서 개발하게 되었다. 위 작품은 어플리케이션을 통하여 시간, 장소에 구애받지 않고 원격 배식이 가능하다. 뿐만 아니라, 예약 자동 배식 추가를 통해서 보다 편리함을 제공하고 여건을 개선하고가 개발하였다.

• International Journal of Computer Science & Network Security
• /
• 제21권2호
• /
• pp.103-109
• /
• 2021

The study aimed to analyze the current situation of the electronic portal of the Northern Border University, in terms of content and components, the extent of quality of use, service assurance and integrity, linguistic coverage of objective content, in addition to assessing the efficiency of the Blackboard e-learning platform and measuring the degree of safety of the portal, in addition to measuring the extent of satisfaction, through a sample that included 135 faculty members, as the researcher was keen to apply the case study methodology with the use of the questionnaire as the main tool for measurement, and the study found that there is an average trend among faculty members in the degree of content for the components of the portal and electronic security While it rose to good use, and very good at using the Blackboard platform.

• 한국환경과학회지
• /
• 제12권12호
• /
• pp.1321-1327
• /
• 2003

Two different kinds of cases, with and without addition of noncrystalline silica to the Hadong kaolin were studied to obtain useful information on the synthesis of zeolite. The research was carried out to investigate the formation area and the crystalized degree of zeolite according to a synthetic time, the water content of raw material mixture, KOH concentration, and stirring intensity. In the case of without addition of noncrystalline silica to the Hadong kaolin and the low concentration range of KOH, the structure of the kaolin was not changed. However, when the mole ratio of K2O/SiO$_2$ in natural kaolin was increased, Linde-L zeolite and unknown structure of kaolins, U-1 and U-2 were produced. While in the high concentration range of KOH, the unknown structure of kaolins, U-6 and U-2, were produced and the production rate of U-6 was increased with the increased of K2O/SiO$_2$ mole ratio. In the case of with addition of noncrystalline silica to the Hadong kaolin and treatment with KOH hydrothermal processing, ZSM-5, ZSM-35, and Linde-L zeolites and the mixture of unknown structure of zeolites, U-1, U-2, U-3, and U-4, were obtained. Both cases demonstrated that the synthesis of zeolite from the Hadong kaolin was highly influenced by KOH concentration of raw material mixture.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2008년도 하계종합학술대회
• /
• pp.495-496
• /
• 2008

The magnetic characteristics of Mg-Zn ferrite that was fired at $1150^{\circ}C$ for 1hour and sintered at $1250^{\circ}C$ for 3hours was examined. The composition ratio of the ferrite was changed after sintering. In that case the composition ratio of ${Fe_2}{O_3}$ was increased but that of CuO was decreased. When the addition quantity of CuO was 3.8 mole%, it's shrinkage rate had maximum value. Magnetic permeability was decreased as the addition rate of CuO was increased and MgO was decreased. When the composition rate of CuO was 2.3 mol% and MgO was 10.9 mol%, the firing density had maximum value. In case that CuO was 2.8mol% and MgO was 10.4mol%, PL had minimum value.

• Neonatal Medicine
• /
• 제15권2호
• /
• pp.200-206
• /
• 2008

안면 기형, 삼각두, 뇌량 무형성, 감각 신경성 난청, 시각장애, 심기형, 심근병증, 폐동맥 고혈압, 배꼽 탈장과 생식기 기형이 있는 환아에게 동반된 9번 염색체 단완이질염색질 부위의 첨가를 발견하여 9번 염색체 p13 부위의 첨가와 연관된 다발성 기형의 발생을 보고하는 바이다.

• 한국표면공학회지
• /
• 제40권6호
• /
• pp.245-249
• /
• 2007

Amorphous IZO films were deposited on PET substrate by DC magnetron sputtering without substrate heating. In order to investigate effect of reactive gas addition on film properties, 0.2-0.4% of $H_2$ or $O_2$ gas was introduced during the deposition. Deposited IZO films were evaluated with mechanical property, electrical property, and water permeability. In the case of $H_2$ gas addition, mechanical property showed clear degradation compared to $O_2$ gas. In the case of $O_2$ gas, water permeability of the IZO film was increased compared to $H_2$ gas which could be attributed to the low adhesion of the film caused by bombardment of high energy negative oxygen ion. As a result, it is confirmed that water permeability of the film could be strongly affected by adhesion of the film.