• Journal of Environmental Science International
• /
• v.22 no.6
• /
• pp.695-703
• /
• 2013

In this study, the effects of four major river project and Kumho River, second biggest branch of Nakdong River, were investigated to provide basic data for proper management of Nakdong River's water quality. Daily sampling processes at three different points, Munsanri (the upper side of Kangjung-Koryung weir), Kangchang (the outlet of the Kumho River) and Samunjin (the lower side of Kangjung-Koryung weir and junction of Kumho River and Nakdong River), were conducted from May 1st 2011 to Sep. 4th 2011. Water samples were analyzed for nine factors, DO, BOD, COD, T-N, T-P, pH, turbidity, SS, and coliform. As demonstrated by the results, concentrations of BOD, T-N, T-P and coliform at Nakdong River were affected by water quality of Kumho River while SS and turbidity were affected by constructions for Kangjung-Koryung weir. Further studies, for example, affects of wastewater treatment facilities, should be followed.

• Journal of Digital Convergence
• /
• v.18 no.5
• /
• pp.425-432
• /
• 2020

Stereoscopic imaging is an important branch in the field of digital imaging, and has grown significantly over the last two decades through research and development. Hologram projection technology based on stereoscopic technology has been a social issue since the development of the Hungarian physicist Daniel Garber in 1947. It is becoming more and more important as stereoscopic works using similar technologies are applied to various fields. This study analyzed content cases using classical and creative stereoscopic technology from the perspective of digital image content design and explored the multiprotocol direction of holographic projection.

• The Journal of the Korean dental association
• /
• v.49 no.9
• /
• pp.527-534
• /
• 2011

Microvascular reconstruction of maxillary composite defect after oncologic resection has improved both esthetic and functional aspect of quality of life of the cancer patients. However, a lot of patients had prior surgery with radiation and/or chemotherapy as a part of comprehensive cancer treatment. Sometimes it is nearly impossible to find out adequate recipient vessel for maxillary reconstruction with microvascular anastomosis. Therefore long pedicle of the flap is needed to use distant neck vessels located far from the reconstruction site such as ipsilateral transverse cervical artery or a branch of contralateral external carotid artery. For this reason, although we know the treatment of the choice is osteocutaneous flap, it is difficult to use this flap when we need long pedicle with complex three dimensional osseous defect. Vascular option for these vessel-depleted neck patients can be managed by a soft tissue reconstruction with long vascular pedicle and additional free non-vascularized flap that is rigidly fixed to remaining skeletal structures. For this reason, maxillofacial reconstruction by vascularized soft tissue flap with or without the secondary restoration of maxillary bone with non-vascularized iliac bone can be regarded as one of options for reconstruction of profound maxillofacial composite defect resulted from previous oncological resection with chemo-radiotherapy.

• Asian Pacific Journal of Cancer Prevention
• /
• v.15 no.7
• /
• pp.3017-3020
• /
• 2014

Background: Oral carcinoma is one of the common types of cancer and one of the 10 leading causes of death around the world. This study was conducted to evaluate senior dental student knowledge about oral cancerous lesions in Zahedan Dental School. Materials and Methods: In this cross-sectional research, all the students in the last academic year at the School of Dentistry were studied during year of 2013. The study questionnaire covered demographic data as well as 12 questions concerning the knowledge of oral cancer. Data were collected and analyzed with SPSS18 using independent t-test, one way ANOVA. Significance level was considered as $p{\leq}0.05$. Results: Of the 104 senior dental students, with an average age of $27.34{\pm}7.79$ years, who participated in this study, 32 (30.8%) were female and 72 (69.2%) were male. The mean score of the students regarding the knowledge of oral cancer was $7.24{\pm}2.61.20$ students (19.2%) had a weak knowledge, 45 students (43.3%) had a moderate knowledge, and 39 students (37.5%) had a good knowledge. Conclusions: The student knowledge of oral cancer is not satisfactory and they need to receive additional information and education.

• Journal of computational fluids engineering
• /
• v.17 no.3
• /
• pp.93-98
• /
• 2012

The injection molding process is suitable for manufacturing complicated plastic products. As the customer request higher quality products increase, realization of the precise dimensional and shape controls is getting more important. For this purpose it is important to obtain uniform cooling procedure over the whole surface of the high temperature molded plastic. Failure to this may lead to different shrinkage speed, internal stresses and unwanted shape deformations. It is necessary to distribute coolant flow rates to the main channel and to the sub-channels properly to insure uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure the intended flow rate to each sub-channels, various shape designs for the channel system were investigated. The results show that as the Reynolds number increases the effect of shape design is more profound. Through the proper flow distribution, uniform cooling effects would be expected.

• Journal of Electrical Engineering and Technology
• /
• v.5 no.3
• /
• pp.379-388
• /
• 2010

The Korea Electric Power Corporation (KEPCO) recorded 2.9 trillion won deficit in the aftermath of the world financial crisis. KEPCO is trying to escape from the business crisis in every way; however, it is impossible to make huge profit by selling electricity alone. Overseas electrical utilities make profits by selling gas and heat along with electricity. However, it is difficult for KEPCO to enter the gas and the heat selling market because other public companies are already dealing with them. In this situation, improving the business is possible when KEPCO develops a new business model and creates added value using Korean advanced Power IT combined with electricity. This study shows a new business model using Power IT, based on a survey targeting managers in KEPCO branch office and electrical engineers in the field. We hope the new business model suggested in this study is adapted to the real field to create high value in the future.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.17 no.1
• /
• pp.44-51
• /
• 2011

Purpose: Nursing in Korea was started by foreign nurse missionaries. This study was intended to recognize the foreign nurse missionaries contribution with the development of Yonsei nursing education in Korea. Method: This study used an historical study approach. The study target was foreign nurse missionary contributions during 1895~1917. The data was collected from the existing historical nursing studies and Korean Mission Field. Result: Since A.P. Jacobson, the first nurse missionary from the North Mission branch in America in 1895, there were 16 missionaries sent to Korea. Among them, 14 missionaries worked for Severance Hospital Nurse Training School. 7 missionaries served less than 10 years and 5 missionaries stayed in Korea more than 20 years. E.L. Shields served the longest time with 42 years in Korea. They contributed not only in nursing education and services in the hospital, but also public health in the community. Conclusion: Foreign nurse missionaries were a cornerstone for nursing development in Korea. They contributed by not only starting nursing education, but also giving women freedom into Korean society. The historical research regarding foreign nurse missionaries during early 1900s helped to recognize their effort for Korean nursing and society.

• Earthquakes and Structures
• /
• v.9 no.6
• /
• pp.1273-1290
• /
• 2015

JK wall is a shear wall made of lightweight EPS mortar and reinforced with a 3-D galvanized steel mesh, called JK panel, and truss-like stiffeners, called JK stiffeners. Earlier studies have shown that low strength lightweight concrete has the potential to be used in structural elements. In this study, seismic contribution of the JK infill walls surrounded by steel frames is numerically investigated. Adopting a hybrid numerical model, behavior envelop of the wall is derived from the general purpose finite element software, Abaqus. Obtained backbone would be implemented in the professional analytical software, SAP2000, in which through calibrated hysteretic parameters, cyclic behavior of the JK infill can be simulated. Through comparison with earlier experimental results, it turned out that the proposed hybrid modeling can simulate monotonic and cyclic behavior of JK walls with good accuracy. JK infills have a panel-type configuration which their dominant failure mode would be ductile in flexure. Finally technical and economical advantages of the proposed JK infills are assessed for two representative multistory buildings. It is revealed that JK infills can reduce maximum inter-story drifts as well as residual drifts at the expense of minor increase in the developed base shear.

• The Journal of Korean Medical History
• /
• v.19 no.1
• /
• pp.99-110
• /
• 2006

Lee Heon gil (a.k.a. Mongsoo), who was the pioneer of measles treatment in the 18th century, is the 14th generation of the Deokcheongun branch of the Lee family from Jeonju, living from August 25, 1738 (14th year of King Yeongjo) to April 29, 1784 (8th year of King Jeongjo). Under his teacher Lee Cheol hwan, the eldest grandson of Lee Yik, he learned medicine and studied it deeply. His medical service was most remarkable when measles was prevalent in 1775 (51st year of King Yeongjo) at his age of 38. It seems that he wrote books on measles based on his experiences at that time. Lee Heon gil's academic background can be inferred from his relation with Lee Cheol hwan and Jeong Yak yong. Associating with Lee Cheol hwan, he established close relationships with many scholars including the Lee family from Yeoju, who were the descendents of Seongho Lee Yik, and through this fellowship he was influenced directly and indirectly by Seongho Lee Yik. In addition, he maintained close contact with Jeong Yak yong while treating him several times. As Jeong Yak yong was also in close academic association with scholars in the Seongho School and Lee Yik's pupils, he had a philosophical consensus with Lee Heon gil. These academic backgrounds show that the philosophical flow of the Seongho School from Seongho Lee Yik to Jeong Yak yong also reached Lee Heongil.

• English Language & Literature Teaching
• /
• v.11 no.2
• /
• pp.19-34
• /
• 2005

Hypertext raises question to general assumptions about our conventional conceptions of education. In this essay, three kinds of learning-models are presented by the application of "writing" hypertext literature to the English education of the elementary school. These models, which I call the "scene-centered" system, give knowledge to learners in non-linear, non-sequential structure. The term "scene" is a single concept or idea composed of a single sub-text, which is to be made by the group of students. This system is focused on the collaborative composition of students. Students, by generating sub-texts and connecting texts, perform the educational activities to expand the source text. The "scene-centered" system is, to put it into a Barte's term, a "writerly text." But in order to "write," "reading" should be accompanied. So, this system is a learning model in which writing and reading are carried on simultaneously. In all the process, students play a role of multi-user, with three access rights: read, write, and annotate. So, students making use of hypertext systems will act as reader-authors. And teachers will take the new role in collaborative writing environment. No longer the central authoritarian evaluator, they will become consultants, co-writers, coaches of their students.