Case Study on the Enterprise Microblog Usage: Focusing on Knowledge Learning

Knowledge Management Strategy can be classified by codification strategy and personalization strategy (Hansen et. al., 1999), and how to manage the two strategies were always studied. Also, current studies regarding the knowledge management strategy were targeted mostly for major companies, resulting in lack of studies in how it can be applied on SMEs. This research, with the knowledge management strategy suited for SMEs, sets an Enterprise Microblog (EMB), and with the EMB applied on SMEs’ Knowledge Management Strategy, it is reviewed on the perspective of SMEs’ Codification and Personalization Strategies. Through the advanced research regarding Knowledge Management Strategy and EMB, the hypothesis is set that “Depending on the development of the company, the main application of EMB alters from Codification Strategy to Personalization Strategy.” To check the hypothesis, SME that have used the EMB called ‘Yammer’ was analyzed from the data of their foundation until today. The case study has implemented longitudinal analysis which divides the period when the EMBs were used into three stages and analyzes the contents. As the result of the study, this suggests a substantial implication regarding the application of Knowledge Management Strategy and its Knowledge Management System that is suitable for SME

Petrositis With Bilateral Abducens Nerve Palsies complicated by Acute Otitis Media

Petrous apicitis is a rare but fatal complication of otitis media. An infection within the middle ear can extend within the temporal bone into the air cells of the petrous apex. With only the thin dura mater separating the trigeminal ganglion and the 6th cranial nerve from the bony petrous apex, they are vulnerable to inflammatory processes, resulting in deep facial pain, lateral rectus muscle paralysis, and diplopia. In 1904, Gradenigo described a triad of symptoms related to petrous apicitis, including acute suppurative otitis media, deep facial pain resulting from trigeminal involvement, and abducens nerve palsy. It has traditionally been treated with surgery, but recent advances in imaging, with improved antibiotic treatment, allow conservative management. In this case report, we describe a clinical and neuroradiological evolution of a child with a petrous apicitis after acute otitis media, which was managed medically with a positive outcome

Current status of newborn hearing screening in low-income families in the southeastern region of Korea

OBJECTIVES The aim of this study was to analyze the current status and problems of hearing screening tests for newborns in low-income families in the southeastern Korea. METHODS This study analyzed data from the Ministry of Health and Welfare’s project on the early detection of hearing loss in newborns in low-income families in the southeastern Korea (2011-2015). RESULTS The referral rate was 1.33, 1.69, and 1.27% in Daegu, Gyeongbuk, and Ulsan, respectively. The confirmatory test rate was 36.09, 23.38, and 52.94% in Daegu, Gyeongbuk, and Ulsan, respectively. The incidence of hearing loss (adjusted) was 0.41, 0.62, and 0.41% in Daegu, Gyeongbuk, and Ulsan, respectively. After confirming hearing loss, newborns with hearing handicaps were mostly lost to follow-up, and rehabilitation methods, such as hearing aids or cochlear implants, were not used. The screening tests were performed within 1 month of birth, and the confirmatory tests were generally performed within 3 months of birth. However, more than 3 months passed before the confirmatory tests were performed in infants with risk factors for hearing loss in Gyeongbuk and Ulsan. CONCLUSIONS Hearing screening tests were conducted in newborns from low-income families in southeastern Korea who received a coupon for free testing, but the newborns that were referred after the screening tests were not promptly linked to the hospitals where confirmatory tests were performed. Furthermore, hearing rehabilitation was not consistently performed after hearing loss was confirmed. To successful early hearing loss detection and intervention, a systematic tracking system of hearing loss children is needed

ENHANCED AIR-GAP CONTROL FOR HIGH-SPEED PLASMONIC LITHOGRAPHY USING SOLID IMMERSION LENS WITH SHARP-RIDGE NANOAPERTURE

INTRODUCTION Recently, plasmonic nanolithography is studied by many researchers (1, 2 and 3). This presented a low-cost and highthroughput approach to maskless nanolithography technique that uses a metallic sharp-ridge nanoaperture with a high strong nanometersized optical spot induced by surface plasmon resonance. However, these nanometer-scale spots generated by metallic nanoapertures are formed in only the near-field region, which makes it very difficult to pattern above the photoresist surface at high-speeds. To overcome this problem, we have designed and developed another type plasmonic nanolithography method that uses a metallic sharp-ridge nanometer-scale aperture and a solid immersion lens (SIL) based near-field recording technology. A plasmonic SIL optical head that consists of a metallic nanoaperture deposited on a SIL can fly ~20 nm above a photoresist (PR)-coated Si-wafer that moves in the linear direction at high speed that is several hundred times faster than existing plasmonic nanolithography methods. Because wafer size is small with several inches, moving velocity and acceleration of lateral stage should be fast to achieve high-speed plasmonic lithography. However, as moving velocity and acceleration are higher, disturbances are dramatically greater. This leads that maintaining gap between SIL and PR coated wafer and line-width is unstable. With existing control method, the residual gap error is over 8 nm at 200 mm/s. To maintain stable line-width, the residual gap error is should be under 2 nm. In this paper, to maintain stable gap and line-width at several hundred mm/s in linear direction, we propose enhanced air-gap control for high-speed plasmonic lithography using SIL. Firstly, we designed the base controller (lead and lag compensator), disturbance observer (DOB) and narrow band disturbance filter (NBDF) that is used to enhance the performance of the air-gap controller under repeatable and nonrepeatable disturbances (4, 5). And, through experiments, the feasibility of the proposed air-gap controller has been verified and checked that the stable gap and line-width are maintained at several hundred mm/s. EXPERIMENTAL SETUP AND CONTROLLER DESIGN EXPERIMENTAL RESULTS CONCLUSIONS To improve the control performance for high-speed plasmonic lithography using solid immersion lens, the control algorithm was designed with narrow-band disturbance filter (NBDF). As the experimental results indicate, the dominant frequency components in the system, which are due to vibration and resonance, are sufficiently eliminated by the proposed integrated control algorithm for the highspeed plasmonic lithography using SIL. Additionally, the nano-gap controller with the NBDF and the double DOB is proposed. In cases where the NBDF-based controller was used together with the double DOB, the air-gap controller performance was improved to avoid disturbance. ACKNOWLEDGMENT

Association between work-related health problems and job insecurity in permanent and temporary employees

OBJECTIVES: This research was conducted with an aim of determining the correlation between job insecurity and an employee’s work-related health problems among permanent and temporary workers. METHODS: Using the data from the First Korean Working Conditions Survey conducted in 2006, a total of 7,071 workers, excluding employers and the self-employed, were analyzed. Work-related health problems were categorized as backache, headache, abdominal pain, muscular pain, stress, fatigue, insomnia, anxiety or depression. Each problem was then analyzed for its relationship to job insecurity through logistic regression analysis. RESULTS: Among the 7,071 workers, 5,294 (74.9%) were permanent workers and 1,777 (25.1%) were temporary workers. For the permanent workers, presence of high or moderate job insecurity appeared more closely linked to backache, headache, abdominal pain, muscular pain, stress, fatigue, insomnia, anxiety, and depression compared to absence of job insecurity. However, for the temporary workers, only depression appeared to be associated with the presence of high job insecurity. CONCLUSION: The study showed that the presence of job insecurity is correlated with work-related health problems. The deleterious effects of job insecurity appeared to be stronger in permanent than temporary workers. Additional research should investigate ways to effectively reduce job insecurity

Positional vertigo afterwards maxillary dental implant surgery with bone regeneration

Benign paroxysmal positional vertigo (BPPV) is the most common form of vertigo. It is caused by loose otoconia from the utricle which, in certain positions, displaced the cupula of the posterior semicircular canal. BPPV most often is a result of aging. It also can occur after a blow to the head. Less common causes include a prolonged positioning on the back (supine) during some surgical procedures. Additionally one can include in this ethiopathogenesis the positioning required during the maxillary dental implant surgery with bone regeneration related to a forced head positioning and inner ear trauma induced by dental turbine noise working in the maxillary bone. Two cases of patients who suffered BPPV after undergoing maxillary dental implant with bone regeneration procedures are reported. Diagnosis and treatment are also described

Enhanced heat transfer is dependent on thickness of graphene films: the heat dissipation during boiling

Boiling heat transfer (BHT) is a particularly efficient heat transport method because of the latent heat associated with the process. However, the efficiency of BHT decreases significantly with increasing wall temperature when the critical heat flux (CHF) is reached. Graphene has received much recent research attention for applications in thermal engineering due to its large thermal conductivity. In this study, graphene films of various thicknesses were deposited on a heated surface, and enhancements of BHT and CHF were investigated via pool-boiling experiments. In contrast to the well-known surface effects, including improved wettability and liquid spreading due to micron-and nanometer-scale structures, nanometer-scale folded edges of graphene films provided a clue of BHT improvement and only the thermal conductivity of the graphene layer could explain the dependence of the CHF on the thickness. The large thermal conductivity of the graphene films inhibited the formation of hot spots, thereby increasing the CHF. Finally, the provided empirical model could be suitable for prediction of CHF.open111522Nsciescopu