내장형 ARM 보드를 이용한 전광판 시스템 설계에 관한 연구

최재우 한국산학기술학회 2004 한국산학기술학회논문지 Vol.5 No.3

본 논문은 ARM7TDMI 칩을 사용하여 모듈단위의 확장이 가능하도록 전광판 시스템을 설계하고 자체적인 한글 입출력 처리가 가능하도록 하였다. 전광판 시스템에 사용자가 원하는 표출문구의 입력, 편집을 쉽고 편리하게 할 수 있는 여러 가지 형태의 입력방법에 대해 연구하였다. PC와 PDA에 의한 유/무선 문구입력이 가능하게 하였고 한글오토마타를 구현하여 리모트 컨트롤러에 의한 표출문구 입력도 가능하게 하였다. 또한 LINUX OS가 포팅 된 PXA255프로세서 기반의 내장형 보드에서 그래픽 라이브러리 툴인 QT/Embedded 2.3.7을 터치패널사용이 가능하도록 포팅하여 원격지의 전광판에 문구를 이더넷 통신방법에 의해 쉽게 바꿀 수 있게 하였다. 본 연구에서 설계한 시스템은 한글에 대한 코드 값만 저장하는 방식이므로 기존 전광판 시스템보다 많은 양의 사용자 정의 문구를 시스템에 저장하여 사용할 수 있다는 장점을 가지고 있다. We have designed LED display system using ARM7TDMI processor and implemented hangul input and output. This system is easily extensible because controller board and LED matrix board were designed one module. Possible Input Methods of LED display system are PC, PDA and remote controller’s wired and wireless communication. We have ported QT/Embedded 2.3.7 with touch panel Input at embedded board of Linux OS 2.4.18 and PXA255 Processor based. QT Application which we coded is able to input displaying text using ethernet communication on embedded system. Many of indicating text data is able to be saved because only korean alphabet codes are stored for data which users want displaying.

오세아니아지역 환경친화적 관광프로그램에 관한 연구

최재우 경북대학교 사회과학대학 지리학과 2006 地理學論究 Vol.- No.25

세계경제 내에서 가장 급속하게 성장하는 관광은 이미 대부분의 국가에서 잘 정착되고 있다. 본 연구는 해외지역연구로서 오세아니아지역의 환경친화적 관광프로그램의 특성에 대해 탐구한 것이다. 본 연구의 목적을 달성하기 위해서 관련 문헌조사 후 오세아니아지역(호주, 뉴질랜드, 피지)을 방문하였다. 연구사례지역은 뉴질랜드의 Waitomo 반딧불이 동굴, 뉴질랜드의 Waipoua Kauri 삼림지대, 호주 빅토리아주 Phillip 섬, 피지 Nadi 부근 Nalesutale 피지원주민마을 등이다. 생태관광프로그램의 대부분은 환경적, 경제적 및 교육적 효과를 위해 개발되었다. 오세아니아지역의 사례연구들은 한국에서 생태관광과 환경보전이 성공할 수 있는 좋은 모델을 보여주고 있으며, 한국에서 환경친화적 관광산업을 위한 효과적인 지역정책들을 제공할 수 있을 것이다. Tourism, the fastest growing industry within the global economy, is already well established within most countries. This paper aims to explore the characteristics of the environmental friendly tourism programs in Oceanian area as a foreign area study. To achieve the objectives, this research carried out a literature review before taking several field surveys in Oceania area(Australia, New Zealand, and Fiji). Research areas are Waitomo Glow Warm Caves in New Zealand, Waipoua Kauri Forest in New Zealand, Phillip Island in Australia, Nalesutale Fijian indigenous village in Fiji Islands. Most of all ecotour programs are developed for environmental, economical and educational effects. The case studies of Oceania area present a good model of how to succeed in ecotourism and conservation management to Korea. In addition, this research will provide effective regional policies for the environmentally friendly tourism in Korea.

2SH-4 Current State of International Standardization for Hydrogen Technology and Korean Participation

최재우 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

International standards (IS) for different technologies are being developed and published by some international standardization bodies. ISO has been established by different panels of experts as members of their technical committees of the bodies who are nominated by national committee of each member country. ISO/TC 197 (ISO Technical Committee for Hydrogen Technology) was created to promote the safe use of hydrogen as an energy carrier and fuel and its penetration into the energy markets. Hydrogen fuel cells are widely used in private houses and commercial buildings due to the big advantage of cogeneration of electricity and heat. This presentation covers basic current activities and standard documents in developing processes of the standards or delivered so far by ISO/TC 197. It deals with also different domestic tasks and organizational structures to participate in the committee's activities and some achievements which are executed by the experts involved in the projects.

지각된 위험이 관광지 이미지와 관광지 전환행동에 미치는 영향 연구

최재우 관광경영학회 2019 관광경영연구 Vol.90 No.-

This study researched the influence of perceived risk on image and switching behavior of destination. First, the influence of perceived risk on destination image was examined. Second, the effect of perceived risk on switching behavior of tourist attraction was clarified and lastly, the influential relation between image and switching behavior of destination was researched. The period of survey is from June 10th to June 20th in 2019 and total 230 sheets of questionnaire were distributed and then final 217 sheets of questionnaire were analyzed except unreliable 13 pieces of questionnaire. First, when it comes to the influential factors of perceived risk on destination image, a financial risk and a temporal risk have a statistically significant positive effect on cognitive image. Second, a perceived risk does not have any influence on switching behavior, which is a different result from precedent researches. Third, as for the influential factors of destination image on switching behavior, both perceived image and emotional image have statistically significant positive effect on switching behavior.

Sorption kinetics of aqueous benzene for attached bacteria on sorbents?

최재우,최낙철,Basuvaraj Mahendran,김동주,이철의 한국물리학회 2007 Current Applied Physics Vol.7 No.1

In this study we investigated the eect of bacteria attached onto the surfaces of two sorbents e.g., activated carbon and alginate bead,on the sorption kinetics of aqueous benzene. Kinetic sorption experiments were performed to obtain time-dependent data of aqueousconcentration subjected to sorption at an initial concentration. The kinetic sorption data were tted with two-site sorption model thatshowed that both fast sorption and biodegradation was associated with removal of benzene for alginate bead, but only fast sorptionfor activated carbon for either case of bacterial treatment. Much lower sorption for attached case of carbon can be explained by the factthat bacteria inhibited sorption of aqueous benzene by lling them in the cavities of carbon surface. Modeling study revealed that sorp-tion process for activated carbon followed two-site kinetic with unlimited slow sorption but the one for bead was described by two-siteing capacity.

3차 칼라 오브젝트 관계에 의한 내용 기반 영상 검색

최재우,권희용,황희융 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

본 논문은 정지 화상에 대한 CBIR(Content-Based Image Retrieval)방법 중 칼라 특성을 이용해서 영상 내 공간 정보를 충분하게 표현할 수 있는 알고리즘을 제안한다. 일반적으로 칼라 특성을 이용한 CBIR은 영상 내 공간정보를 충분하게 표현하지 못하는 단점을 지니고 있다. 이에 기존 논문에서는 인위적으로 영상을 여러 개로 분할하는 방법 등으로 공간정보를 표현하고자 하였지만 특징백터의 수가 급격히 늘어남에 따라 검색효율이 저하된다는 단점을 가지고 있다. 본 논문에서는 기존의 방법을 칼라오브젝트의 추출 방법에 따라 1차와 2차 관계에 의한 방법으로 분류하고, 이동, 회전 특히 크기 변화(축소, 확대)에 탁월한 성능을 보이는 칼라 오브젝트의 3차 관계를 이용한 방법을 소개한다. 주어진 영상으로부터 양자화된 24개의 버킷을 생성해서 각 버킷 내의 칼라에 대한 색의 표준 편차로 색의 분산 정도를 나타내고, 히스토그램의 빈도수가 높은 세 개 버킷의 평균 칼라 위치를 계산해서 그들의 상호 각도를 추출하여 영상의 특징 벡터로 사용한을 제안하였다. 실험결과 기존 방법보다 특히 영상의 크기 변화에 대해 좋은 결과를 얻을 수 있었으며, 계산량도 적어 효율적임을 보여 주었다.

The Ability of the Acute Physiology and Chronic Health Evaluation (APACHE) IV Score to Predict Mortality in a Single Tertiary Hospital

최재우,박영선,이영석,박연희,정채욱,박동일,권인선,이주상,민나은,박정은,유상훈,전규락,설영훈,문재영 대한중환자의학회 2017 Acute and Critical Care Vol.32 No.3

Background: The Acute Physiology and Chronic Health Evaluation (APACHE) II model has been widely used in Korea. However, there have been few studies on the APACHE IV model in Korean intensive care units (ICUs). The aim of this study was to compare the ability of APACHE IV and APACHE II in predicting hospital mortality, and to investigate the ability of APACHE IV as a critical care triage criterion. Methods: The study was designed as a prospective cohort study. Measurements of discrimination and calibration were performed using the area under the receiver operating characteristic curve (AUROC) and the Hosmer-Lemeshow goodness-of-fit test respectively. We also calculated the standardized mortality ratio (SMR). Results: The APACHE IV score, the Charlson Comorbidity index (CCI) score, acute respiratory distress syndrome, and unplanned ICU admissions were independently associated with hospital mortality. The calibration, discrimination, and SMR of APACHE IV were good (H = 7.67, P = 0.465; C = 3.42, P = 0.905; AUROC = 0.759; SMR = 1.00). However, the explanatory power of an APACHE IV score >93 alone on hospital mortality was low at 44.1%. The explanatory power was increased to 53.8% when the hospital mortality was predicted using a model that considers APACHE IV >93 scores, medical admission, and risk factors for CCI >3 coincidentally. However, the discriminative ability of the prediction model was unsatisfactory (C index <0.70). Conclusions: The APACHE IV presented good discrimination, calibration, and SMR for hospital mortality.

COVID-19에 의한 관광산업 현황분석 및 대응방안

최재우,최영택,주위 관광경영학회 2020 관광경영연구 Vol.96 No.-

COVID-19 has not only influenced our daily lives, but it also poses a threat to households, businesses, and national and global economies. In order to prevent the rapid spread of the epidemic, countries around the world are campaigning for domestic social distancing, and in order to prevent the influx of viruses from abroad, many countries began to ban or restrict the entry of people from affected countries. As a result, the sky between countries has been blocked, making it difficult for industries relating to people’s movement--airlines, travel, OTA, hotels, MICE, medical tourism, and domestic festivals--to survive the current shutdown situation for another 2-3 months. Looking back at the epidemics of 21st century--SARS(2002), H1N1(2009), MERS(2015), and COVID-19(2020)--it can be seen that the incidence of epidemics has been shortened. In the event of an epidemic outbreak in the future, we will be able to suppress it more rapidly through the accumulated experience from the COVID-19 outbreak. To do so, it is necessary to establish and share manuals, so that each country responds jointly to the global crisis caused by an epidemic outbreak. This study explores the current status of the tourism industry and the infection status of regions such as: Asia, Europe, and the United States, where COVID-19 is in progress. The crisis in Europe is still growing and much worse in America. The situation in Asia is getting recovered but not optimistic. This study also explores self-recovery efforts and measures for each industry, along with the current status of the domestic tourism industry, and additionally gives its suggestions to the tourism industry’s measures in terms of supply, demand, policy, strengthening crisis management, consumer behavior, technological competency enhancement and the development of new tour products.

근로자의 고용상태가 미충족 의료에 미치는 영향

최재우 보건의료산업학회 2018 보건의료산업학회지 Vol.12 No.4

Objectives: This study was designed to evaluate whether employment status is associated with the experience of unmet care needs. Methods: This study utilized the Korea Health Panel data from 2012 to 2016. A total of 4,083 workers were selected as baseline subjects in 2012 and were followed for four years. This study used the GLIMMIX procedure under the marginal model while adjusting for covariates. Results: A total of 12.4% of 4,083 people said they had failed at least once to have a treatment or checkup despite the needs. Those more likely to experience unmet care needs were women and people of lower income level, with worse health conditions and chronic disease. Precarious workers, the self-employed, and the unemployed were more likely to experience unmet care needs caused by economic burden than permanent workers (Odds Ratio: 2.14, 2.07, 2.74, respectively). Conclusions: This disparity means that precarious workers and the unemployed are more likely to face barriers in obtaining needed health services. Given their insecure employment status, meeting their needs for health care is an important consideration.

Adsorption of zinc and toluene by alginate complex impregnated with zeolite and activated carbon

최재우,Ki-Seok Yang,김동주,이철의 한국물리학회 2009 Current Applied Physics Vol.9 No.3

In this study, a novel alginate complex was developed for removal of mixed contaminants containing both organic and inorganic compounds. The alginate complex was generated by impregnating synthetic zeolite and powdered activated carbon (PAC) into alginate gel bead. The adsorption of zinc and toluene as target contaminants onto the alginate complex was investigated by performing both equilibrium and kinetic batch tests. Equilibrium tests showed that adsorption of two contaminants followed Langmuir isotherm and that the alginate complex was capable of removing zinc (maximum binding energy β = 4.3 g/kg) and toluene (β = 13.0 g/kg) best compared to other adsorbents such as granular activated carbon (GAC), zeolite, and alginate impregnated with PAC (AG–AC bead). These values were higher than those of any other adsorbents for each contaminant. It was further revealed from kinetic tests that removal efficiency of zinc and toluene was 54% and 86% for the initial solution concentrations of 250 mg/L, respectively. This indicates that the alginate complex developed in this study can be used as promising adsorbents for simultaneous removal of organic and inorganic compounds from industrial wastewater or groundwater containing mixed contaminants.