• Journal of Sensor Science and Technology
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• v.28 no.6
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• pp.402-406
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• 2019

Recently, semiconducting organic materials have been spotlighted as next-generation electronic materials based on their tunable electrical and optical properties, low-cost process, and flexibility. However, typical organic semiconductor materials are vulnerable to moisture and oxygen. Therefore, an encapsulation layer is essential for application of electronic devices. In this study, SiN_x thin films deposited at process temperatures below 150 ℃ by plasma-enhanced chemical vapor deposition (PECVD) were characterized for application as an encapsulation layer on organic devices. A single structured SiN_x thin film was optimized as an organic light-emitting diode (OLED) encapsulation layer at process temperature of 80 ℃. The optimized SiN_x film exhibited excellent water vapor transmission rate (WVTR) of less than 5 × 10^-5 g/㎡·day and transmittance of over 87.3% on the visible region with thickness of 1 ㎛. Application of the SiN_x thin film on the top-emitting OLED showed that the PECVD process did not degrade the electrical properties of the device, and the OLED with SiN_x exhibited improved operating lifetime

• Tuberculosis and Respiratory Diseases
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• v.69 no.1
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• pp.52-55
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• 2010

Pulmonary tuberculosis has intermediate prevalence in Korea. It is known that tuberculosis infection predominantly involves the upper lobes, based on the fact that multiplication of Mycobacterium tuberculosis is favored in areas with decreased pulmonary blood flow, impaired lymphatic drainage, and high oxygen tension. We report this case of a 40-year-old man who was brought to our hospital with hemoptysis and dyspnea. Prior to admission, the patient had been in a bedridden state for 15 years due to an injury of the cervical spine 4~5. A 3-Dimensional computed tomography showed predominantly longitudinal distribution of centrilobular nodules along the anterior chest wall, in the left lung. MTB-PCR and AFB culture of bronchial washing fluid revealed pulmonary tuberculosis. This case shows that long-standing supine posture and decreased motion of the anterior chest wall may change the distribution of preferential infection site of Mycobacterium tuberculosis in the lung, resulting in a ventral predominance of tuberculosis infection in the quadriplegic patient.

• Elastomers and Composites
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• v.50 no.1
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• pp.24-29
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• 2015

In this study, we investigated the effects of a crosslinking agent and a compatibilizer on the mechanical and rheological properties of waste PP and waste ground rubber tire (WGRT) composites. In order to simulate a commercial TPV, the component of waste PP and WGRT was fixed at 30 and 70 wt%, respectively. With the simple addition of SEBS-g-MA into the waste PP/WGRT composites, the tensile strength of the composite was decreased, whereas both the elongation at break and impact strength were significantly increased because of rubbery characteristics of SEBS-g-MA. In order to further improve the properties of the composites, the waste PP/WGRT/SEBS-g-MA composites was revulcanized with dicumyl peroxide (DCP). As expected, mechanical properties of the revulcanized composites was generally improved. Especially, with 15 and 1 phr of SEBS-g-MA and DCP, elongation at break was highest value of about 183% because of the recross-linking of WGRT without chain scission of the main chain. It was found that complex viscosity of the revulcanized composite increased which might verify further vulcanization of the WGRT.

• Journal of Sensor Science and Technology
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• v.29 no.1
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• pp.27-32
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• 2020

This study proposes a pixel-patterning method for organic light-emitting diodes (OLEDs) based on thermal transfer. An infrared lamp was introduced as a heat source, and glass type donor element, which absorbs infrared and generates heat and then transfers the organic layer to the substrate, was designed to selectively sublimate the organic material. A 200 nm-thick layer of molybdenum (Mo) was used as the lightto-heat conversion (LTHC) layer, and a 300 nm-thick layer of patterned silicon dioxide (SiO₂), featuring a low heat-transfer coefficient, was formed on top of the LTHC layer to selectively block heat transfer. To prevent the thermal oxidation and diffusion of the LTHC material, a 100 nm-thick layer of silicon nitride (SiN_x) was coated on the material. The fabricated donor glass exhibited appropriate temperature-increment property until 249 ℃, which is enough to evaporate the organic materials. The alpha-step thickness profiler and X-ray reflection (XRR) analysis revealed that the thickness of the transferred film decreased with increase in film density. In the patterning test, we achieved a 100 ㎛-long line and dot pattern with a high transfer accuracy and a mean deviation of ± 4.49 ㎛. By using the thermal-transfer process, we also fabricated a red phosphorescent device to confirm that the emissive layer was transferred well without the separation of the host and the dopant owing to a difference in their evaporation temperatures. Consequently, its efficiency suffered a minor decline owing to the oxidation of the material caused by the poor vacuum pressure of the process chamber; however, it exhibited an identical color property.

• Journal of Chest Surgery
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• v.50 no.2
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• pp.99-104
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• 2017

Background: We observed several cases of rare vascular anomalies within the femoral triangle during varicose vein operations. Methods: From among 2,093 patients who underwent stripping operations of the great saphenous vein between January 2002 and June 2016, 14 cases of rare vascular anomalies were enrolled in this study. Results: Twelve cases of femoral artery and vein transposition (0.57%), 1 case of separate entrance of the great saphenous vein trunk and its tributaries (0.05%), and 1 case of separate entrance with femoral artery and vein transposition (0.05%) were observed. The preoperative diagnosis rate was 71% (10 of 14) using duplex ultrasound. In all cases of femoral artery and vein transposition, the saphenofemoral junction was located at the lateral or posterolateral side of the superficial femoral artery, corresponding to complete or incomplete transposition, respectively. Among the 12 cases of femoral artery and vein transposition, 5 cases were complete transposition and 7 cases were incomplete transposition. In 2 cases of separate entrance of the great saphenous vein trunk and its tributaries, the separated tributaries formed a common trunk before connecting to the femoral vein. Conclusion: The anatomy of the saphenofemoral junction may infrequently be altered in some individuals. Detailed preoperative sonographic examinations and meticulous groin dissection during the operation are necessary to prepare for unexpected anatomical variations.

• Korean Journal of Health Education and Promotion
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• v.29 no.5
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• pp.125-133
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• 2012

Objectives: We used participatory mapping as a tool for empowerment training for promoting health and safety of farmers. We would like to introduce the application of participatory mapping method and report our experiences in a rural community in Korea. Methods: A one-day workshop was offered in six rural villages which were designated as 'safe farm zones'. Each workshop started with an orientation session, followed by a village rounding, presentations of best cases, a group exercise to draw and present a healthy village map. Participants were requested to express their ideas and experiences about healthy and safe residential and working environments on their map. Results: A total of 206 farmers(100 male, 106 female) participated in the workshops. In each workshop, an average of 34.3 farmers participated, and their mean age was 59 years. In the six workshops, the participants proposed a total of 137 action plans. The action plans included improvement of co-working condition, building facilities for recreation, improving traffic safety measures, and improving residential environment. Conclusions: Participatory mapping was successfully developed and applied as a tool for empowering Korean farmers. The participants were able to express their ideas and thoughts about healthy and safe village and action plans on the map. Moreover, some of the actions in the action plans were carried out immediately after workshop.

• FLOWER RESEARCH JOURNAL
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• v.16 no.3
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• pp.218-221
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• 2008

A new cultivar of Rosa hybrida 'Wooami Salmon' was developed by crossing 'Silver 87' and 'Lambada' at Gumi Floricultural Experiment Station in 2001. Characteristics trials were conducted three times from 2003 to 2006. This cultivar showed pale salmon flower color (RHS, Orange group 27-B) and standard type with good flower shape. The flower diameter is 10.8cm and the number of petals per flower is 46. Vase life of 'Wooami Salmon' could be as long as 12.8 days. The yearly mean yields of 'Wooami Salmon' was $129stems/m^2$. 'Wooami Salmon' has good quality of cut flower and strong vigor in plant growth. This cultivar is appropriate for both soil and solution(hydroponics) cultures.

• Journal of the Korean Orthopaedic Association
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• v.53 no.6
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• pp.552-557
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• 2018

Vitamin D plays a major role in bone metabolism, and its deficiency has an impact on fracture risk and healing. Low vitamin D levels are a cause of poor bone mineralization and have been associated with a significantly higher risk of physeal injury in children. This paper presents a case of a 13-year-old boy with a vitamin D deficiency, who sustained multiple sequential epiphyseal injuries at various areas. This report suggests that vitamin D deficiency is not only a significant cause of the clinical disease itself, but also an important factor affecting the successful recovery of injuries.

• Applied Microscopy
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• v.50
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• pp.2.1-2.7
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• 2020

Electron energy loss spectroscopy (EELS) is an analytical technique that can provide the structural, physical and chemical information of materials. The EELS spectra can be obtained by combining with TEM at sub-nanometer spatial resolution. However, EELS spectral information can't be obtained easily because in order to interpret EELS spectra, we need to refer to and/or compare many reference data with each other. And in addition to that, we should consider the different experimental variables used to produce each data. Therefore, reliable and easily interpretable EELS standard reference data are needed. Our Electron Energy Loss Data Center (EELDC) has been designated as National Standard Electron Energy Loss Data Center No. 34 to develop EELS standard reference (SR) data and to play a role in dissemination and diffusion of the SR data to users. EELDC has developed and collected EEL SR data for the materials required by major industries and has a total of 82 EEL SR data. Also, we have created an online platform that provides a one-stop-place to help users interpret quickly EELS spectra and get various spectral information. In this paper, we introduce EEL SR data, the homepage of EELDC and how to use them.

• Journal of the Korean Institute of Landscape Architecture
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• v.41 no.3
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• pp.31-42
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• 2013

This study was carried out to systematically maintain and manage the trails by assessing the types of deterioration and naturalness of trails located in Mt. Toham, Mt. Nam, Mt. Danseok and in the Mt. Gumi district of the Gyeongju National Park. The route length of Mt. Toham was 2.7km, 2.3km of Mt. Nam, 1.0km of Mt. Danseok and 2.7km of Mt. Gumi district. The numbers of measuring points in Mt. Toham were 37 units, 29 units of Mt. Nam, 16 units of Mt. Danseok and 40 units of Mt. Gumi district. In characteristics of physical environments, Mt. Danseok was the widest and Mt. Gumi was the narrowest in the width of trail. In the bared width of trail, Mt. Danseok was the widest and Mt. Gumi was the narrowest. In depth of erosion, Mt. Danseok was the deepest and Mt. Gumi was the shallowest. Mt. Danseok was the steepest and Mt. Nam was the gentlest in the longitudinal slope. In the results of analysing the types of deterioration, Mt. Toham were 10 types, 14 types of Mt. Nam, 11 types of Mt. Danseok and 9 types of Mt. Gumi district. The times of appearance of deterioration types in Mt. Toham were 69 times, 87 times of Mt. Nam, 67 times of Mt. Danseok and 71 times of Mt. Gumi district. The most common type was the exposure of root in 4 districts of Gyeongju National Park. In the results of assessing the naturalness, Mt. Toham was 2.1 score(II degree), 2.6 score(II degree) of Mt. Nam, 2.9 score(III degree) of Mt. Danseok and 2.0 score(II degree) of Mt. Gumi district. The average naturalness was 2.4 score and II degree.