스마트폰을 비롯한 모바일 기기의 디스플레이 해상도는 급격히 증가하고 있다. 최근 출시된 제품들은 대부분 이백만 화소 이상인 디스플레이를 사용하고 있다. 하지만 모바일용으로 널리 사용되는 멀티미디어 영상의 해상도는 디스플레이 해상도에 비해 상대적으로 낮다. 예를 들어 T-DMB(Terrestrial Digital Multimedia Broadcasting)의 화소수는 320x240이며, 인터넷 스트리밍 동영상은 대부분 720x480이하이다. 저해상도의 영상을 고해상도 디스플레이에서 재생하기 위해서는 보간을 수행해야 하는데, 이 과정에 의해 화질이 열화 된다. 특히 영상 확대에 따른 블로킹잡음 (blocking noise)의 가시성 증가는 모바일 디스플레이의 화질 저하에 중요한 영향을 미치는 요소 중에 하나이다. 본 논문에서는 보간된 영상을 대상으로 한 블로킹 잡음 저감 방법을 제안한다. 제안하는 방법은 에지를 보존하며 블로킹 잡음을 효과적으로 저감시킨다. 또한, 간단한 사칙연산, 비트연산과 비교연산만을 사용하여 모바일 기기에서의 하드웨어 구현이 용이하다는 장점을 갖는다.

The purpose of this study analyzed the overview of corrugated cardboasrd manufacturing industry and then provide direction for improvement. The BREF (BAT reference document) is an important reference for licensees and officer, including the best available techniques for the industry and achievable environmental performance, technical characteristics, and economic information. In the corrugated cardboard manufacturing process, wastewater pollutants are generated throughout the production process, and water is used in the dissociation and aging process. Atmospheric emissions are mostly generated by steam production from boilers and incinerators for the dry process. SO2, NOx, CO2, CO, HCl, dust, VOC, and odor were common. In the EU-BREF (European union BAT reference documents) BAT for wastewater have taken up a relatively large proportion. Items of water pollutants in wastewater were common in COD, BOD, N, P, SS, and however EU-BREF had different pollutants such as AOX and salt compared to K-BREF. In order to improve the quality of the K-BREF, it is necessary to devise basic data research method and data acqusitiom method. Consideration should be given to additional environmental management techniques that reflect the emissions characteristics of the corrugated cardboard manufacturing process. In addition, further research is needed to develop methodologies for selecting BATs considering environmental and economic feasibility.

Purpose: The incidence of pediatric herpes zoster has been increasing year by year. Pediatric herpes zoster is generally known to be less severe than adult cases, but may cause various complications such as secondary bacterial infections, encephalitis, meningitis, and Ramsay Hunt syndrome. In this study, we performed epidemiological and clinical investigations of children and adolescents diagnosed as herpes zoster. The incidence and clinical factors associated with complications of herpes zoster were studied. Methods: This study was retrospectively analyzed the medical records of 62 patients under 18 years who were diagnosed and treated with herpes zoster at Chosun University Hospital from 2007 to 2017. This patients were evaluated with regard to gender, age, dermatomal distributions, accompanying symptoms, underlying disease, treatment and complications. These patients were divided into two groups according to the presence or absence of complications. Results: Children under 18 years old account for 3.2% of all herpes zoster patients who were hospitalized at Chosun University Hospital from 2007 to 2017. The incidence of males was higher than that of females. The number of enrolled patients was increasing according to age. The number and the proportion of pediatric patients has been increasing year by year. Lesions of herpes zoster were most frequently found in the thoracic region, followed by the cervical, trigeminal, lumbar regions. The most common accompanying symptom was pain, followed by pruritus, fever, headache. Among the 62 cases, 27 cases (27.4%) were complicated by herpes zoster. Ramsay Hunt syndrome was the most common (16.1%), followed by meningitis and herpes ophthalmicus. Neither secondary bacterial infection nor postherpetic neuralgia were observed. Skin lesions in the trigeminal dermatomes was associated with complications (p=0.006). The mean of hospitalization period is longer in the group with complications (p=0.003). The patients accompanying symptoms such as headache was more likely to occur complications (p value＜0.05). There was no difference in age, sex, and underlying disease between the two groups. Conclusion: Patients with complications had longer duration of treatment and had more frequent with trigeminal and cervical region. The patients accompanying symptom such as headache were more likely to occur complications.