웹 접근성 표준 준수에 영향을 미치는 요인과 함의에 관한 연구

현준호 韓國外國語大學校 大學院 2015 국내박사

Influential Factors on Compliance of Web Accessibility Standard and Its Implications: Focusing on the Perspectives of Web Developers The power of the web is in its universality. Access by everyone regardless of disability is an essential aspect - By Tim Berners-Lee(Invertor of Web) The dramatic development of information technology and the Web penetration has brought information society forth. On information society, the source of wealth of the individual, the society and the nation is the ability to create and utilize information and knowledge. Therefore, the Web access becomes an essential tool to live in information society. The Web is fundamentally designed to work for all people including people with disabilities, whatever their hardware, software, language, culture, location, or physical or mental ability. To do achieve this goal, the Web is accessible to people with a diverse range of hearing, movement, sight, and cognitive ability. However, when websites are badly designed, they can create barriers that exclude people from using the Web. In order to eliminate these barriers, web developers should comply with web accessibility standard. According to the '2013 Annual Web Accessibility Survey' which was conducted by the Ministry of Science, ICT and Future Planning(MSIP) and National Information Society Agency(NIA), average web accessibility score of public sector's websites is 92.4 point out of 100 point, but private sector's is 78.5 point. So private sector websites needs to improve their websites accessible. This study investigates why web developers don't comply with web accessibility standard. In order to find influential factors on compliance of web accessibility Standard, two research questions are developed-(1) What's the web accessibility status of public organizations and private companies websites among Korea, United States and United Kingdom?, (2) Why web developer's don't comply with web accessibility standard? To investigate first research question, this study evaluated the accessibility of important public organizations such as Blue house, White house, The Prime Minister Office, etc. and privates companies such as KRX100, NYSE100, FTSE100 among Korea, United States, United Kingdom. This sample was selected because it usually provides leadership in the use web technology. Finally, 436 websites were analyzed with PAJET web accessibility validation tool. Overall results of analysis, an average of 436 websites accessibility score is 79.7 point out of 100, Korea's(140 websites) average is 91.4 point, United States's(149 websites) average is 69.8 point, United Kingdom's(147 websites) average score is 78.7 point. Average score of public websites(148 websites) is 89.4 point, privates websites(288 websites) is 74.7 point. To analyze the differences between group such as country and category of organization(public vs private), analysis of variance (ANOVA) was conducted. Two result of the one-way ANOVA test, p-Value is 0.000, 000. There were statistically significant differences between country group and category of organization. To investigate second research question, this study proposes a comprehensive model for intention to complying web accessibility standard based on IT attitude theory, Theory of Planned Behavior, Diffusion of Innovations and previous studies related to web accessibility. To explore the importance of influential factors on compliance of web accessibility, the online-quantitative survey was conducted in order to collect data from a selection of web developers in Korea. The dependent variable was intention to comply web accessibility standard, the mediating variable was attitude to comply web accessibility standard. This study examined seven independent variables: (1) Normative belief- colleague, manager, CEO, (2) Perceived Awareness on Web Accessibility-necessity of providing alt-text, captions for multimedia content, label for input form, etc., (3) Perceived Benefits of Web Accessibility-creating better image for companies/organization, attract new customers, increasing search engine optimization, etc.. , (4) Communication capability-formal and informal, (5) Organization's support-time, people, budget, training, (6) Awareness of Accessibility Law, (7) Activities of Corporate Social Responsibility. Structural equation modeling analysis was conducted on the survey data to determine model fitness of proposal research models and significance of the independent variables to attitude and intention to comply web accessibility standard. This study found six influential factors which can be used as a guideline on how to increase compliance of web accessibility. These factors are (1) Normative Belief, (2) Perceived Awareness on Web Accessibility, (3) Perceived Benefits of Web Accessibility, (4) Communication capability, (5) Awareness of Accessibility Law, (6) Activities of Corporate Social Responsibility. Also, Best practices study was conducted as a tool to find insights and solutions for increasing web accessibility. Two dominant companies of web accessibility and web business field in Korea, which are NHN and DaumKakao, were selected to analyse. The results indicates that a influential factors for complying web accessibility standard is individual factors such as awareness and benefits of web accessibility, not organization's support. To increase compliance's rate on web accessibility standard, companies should be made common sense of importance on web accessibility. In order to increase awareness of accessibility, seven activities are recommended (1) develop accessibility policy, (2) people with disabilities as a target customer, (3) operate training course & campaign, (4) create incentive systems - carrot and stick, (5) conduct web accessibility evaluation, (6) cultivate opinion leader, (7) hire people with disabilities.

Natural course and clinical implication of anticoagulation in new-onset postoperative atrial fibrillation after non-cardiac surgery

현준호 울산대학교 2019 국내석사

Background: Little data is available on post-operative atrial fibrillation (POAF) after non-cardiac surgery. Objective: We sought to evaluate the natural course of POAF and clinical implication of anticoagulation in patients without prior history of atrial fibrillation (AF). Methods: Of the 599,071 patients who underwent non-cardiac surgery from 2009 to 2019 in our center, peri-operative AF was diagnosed in 1,857 (0.31%) patients, and 444 new-onset POAF was identified. After exclusion of persistent POAF (n=5), the clinical data of 444 patients (mean 67 years, 64% male) with new-onset POAF who were discharged in a sinus rhythm were evaluated. The main outcomes of current study were recurrent AF, thromboembolic event, and clinically relevant bleeding during follow-up. Results: Recurrent AF was found in 60 (13.5%) patients during 2-year follow-up period. Hypertension (HR 1.89, 95% CI 1.08-3.30, p=0.026), vascular disease (HR 2.16, 95% CI 1.19-3.93, p=0.012) and moderate-severe left atrial enlargement (HR 2.42, 95% CI 1.34-4.36, p=0.003) were independent predictors of recurrence. These patients with recurrent AF were at higher risk of thromboembolic event compared to those without (15.0% vs. 4.0%, p=0.026). In these patients with recurrent AF, the rate of ischemic stroke was lower in those using anticoagulation than those without (18% vs. 4%), although statistical significance was not reached. When the overall patients were divided into two groups according to a anticoagulation prescription on discharge, a total of 99 patients (22.3%) received standard anticoagulation. The rate of death (44.7% vs. 41.7%, p=0.456) and thromboembolic events (4.3% vs. 5.7%, p=0.612) were not significantly different between those with and without anticoagulation during follow-up. However, the rate of clinically-relevant bleeding was significantly higher in those patients who received anticoagulants (33.4% vs. 12.6%, p<0.001). This risk of bleeding was significant even after multivariable adjustment (HR 3.58, 95% CI 2.00-6.40, p<0.001). Conclusion: Anticoagulation therapy did not impact on the incidence of thromboembolic events during 2 years in patients with new-onset POAF after non-cardiac surgery. Deferred, rather than routine, use of standard anticoagulation in high-risk patients such as those with recurrent AF would be beneficial. 목적: 비심장 수술 후 새롭게 발생한 심방 세동에 대해서는 알려진 바가 적다. 본 연구는 이전에 심방 세동의 과거력이 없는 환자에서 비심장 수술 후 새롭게 발생한 심방세동의 자연경과와 항응고 치료의 효용성에 대해 조사하고자 하였다. 방법: 2009년부터 2016년까지 서울아산병원에서 비심장 수술을 받은 599,071 명의 환자들 중 1,857 명이 수술 전후로 심방세동을 진단받았으며, 이들 중 이전에 심방 세동의 과거력이 없는 444 명의 의무기록을 후향적으로 분석하였다. 수술 후 2년 동안 심방세동의 재발률과 혈전색전증 및 임상적으로 유의한 출혈사건의 발생률을 분석하였다. 결과: 2년의 추적 기간 동안 60 명 (13.5%) 의 환자에서 심방 세동의 재발을 확인하였다. 심방 세동의 재발은 고혈압 (HR 1.89, 95% CI 1.08-3.30, p=0.026), 혈관 질환 (HR 2.16, 95% CI 1.19-3.93, p=0.012), 중등도 및 중증 좌심방 확장 (HR 2.42, 95% CI 1.34-4.36, p=0.003) 과 독립적으로 연관되었다. 이렇게 심방 세동이 재발한 환자에서 혈전색전증의 위험도가 재발하지 않은 환자에 비해 유의하게 높았다. (15.0% vs. 4.0%, p=0.026) 또한 비록 통계적으로 유의하지는 않았지만 심방 세동이 재발한 환자들 중에서 항응고치료를 받은 환자가 항응고치료를 받지 않은 환자에 비해 혈전색전증의 발생이 적었다. (18% vs. 4%) 퇴원 당시를 기준으로 항응고 치료 여부에 따라 2 군으로 분류하였을 때 총 99 명 (22.3%) 이 항응고 치료를 받았다. 2 군 간 사망률 (44.7% vs. 41.7%, p=0.456) 과 혈전색전증 (4.3% vs. 5.7%, p=0.612) 의 발생률은 유의한 차이는 없었다. 그러나 항응고 치료를 받은 환자에서 그렇지 않은 환자에 비해 더 많은 출혈 사건이 발생하였다. (33.4% vs. 12.6%, p<0.001) 이러한 출혈 위험도는 다변량 분석 후에도 유의 하였다. (HR 3.58, 85% CI 2.00-6.40, p<0.001) 결론: 비 심장 수술 후 새롭게 심방 세동이 발생한 환자에서 항응고 치료는 2년 동안 혈전색전증을 유의하게 감소시키지는 못하였다. 수술 후 심방 세동이 발생한 모든 환자에서 일괄적으로 항응고 치료를 적용하기 보다는, 심방 세동의 재발과 같은 고위험군에서 선택적으로 시행하는 것이 효과적일 수 있다.

중학교 수학과 수준별 이동수업에 대한 교사들의 의식조사

현준호 대구대학교 2011 국내석사

In the period of informationalization and globalization, we should offer the education to match students' abilities in order to maximize individuals' potential abilities But the uniform education makes superior students spend a boring time and inferior students spend a meaningless time in our classroom. This is the reason why the Seventh Curriculum Reform adopted the ability grouping even if it may cause some side effect. In this study I surveyed into the problems of the current 'Differentiated Moving Class' and improving achievement and study environment through the response of teachers. Therefore, we choose 245 mathematics teachers of 58 middle schools in Daegu. And we have the following conclusions. 1. Individual ability could be considered through 'Differentiated Moving Class'. 2.When conducting 'Differentiated Moving Class', teachers are feeling the difficulties of reconstruction teaching material respectively. Therefore, standardized teaching material developed for each class level. After the 'Differentiated Moving Class', teacher have increased their workload. Therefore, we need to reduce the workload.

호텔서비스에서 공급체인관리의 성공요인에 관한 연구

현준호 세종대학교 세계경영대학원 2002 국내석사

All-Glass Solar Vacuum Collector Tube의 열성능 및 내구성 증진에 관한 기초 연구

현준호 濟州大學校 大學院 2002 국내석사

Nature has been giving us energy from the beginning of the world. But human hardly use it. Solar energy is a kind of energy from the nature. This study has been carried out to study the use of solar energy as it is harnessed in the form of thermal energy. Solar energy is one of the most promising energy resources on earth and in space, because it is clean and inexhaustible. Heat for comfort in buildings can be provided from solar energy by systems that are similar in many respects to the water heater systems. To utilize the solar energy, we can not only solve the problem of energy shortage, but also can protect the environment and benefit the human beings. We must think about how to absorb the solar energy more efficiently, how to store more energy, and other problems such as additional electrical-heating system. This study deals with the collection of solar energy and its storage in all-glass solar vacuum tubes for different types of header design, flow passage and heat transfer devices. In order to elicit the most efficient combination of header design, flow passage, heat transfer hardware and operating conditions, we have studied four different types of solar collectors utilizing vacuum tubes. We selected the evacuated solar collector with metal cap and the all-glass evacuated solar collector. These collectors are more efficient than flat-plate collectors in both direct and diffuse solar radiation. The all-glass evacuated collector have been widely utilized due to their high efficiency, low heat losses, long lifetime and low costs. The evacuated solar collector in the present study uses a single vacuum solar collector either with a heat pipe (SEIDO 5) or with a "dual pipe" flow passage (SEIDO 2). The one with heat pipe is designed such that the condensing section of heat pipe is inserted into a pipe header where the water from the storage tank is constantly circulated. Solar energy is transferred in the form of heat as it is ultimately saved in the storage tank. Similar principle is applied in the "dual pipe" type where cold water enters the inner pipe and flows along the outer pipe raising its emperature thanks to the irradiation of solar energy. Different from these in its design and heat collection mechanism, all glass solar vacuum collector is utilized more efficiently and more conveniently in harnessing the solar energy. The "U-pipe" type is one of those methods, which became quite popular recently with the usage of all glass solar vacuum tubes. Water is heated as it flows through the U-shaped copper pipe placed inside the vacuum tube. A rolled copper sheet tightly inserted along the inner surface of inner tube enhances heat transfer between the heated collector surface and the water contained in the U-shaped copper pipe. This study has been carried out a series of tests under the same conditions to elicit the most suitable model, which deems to enhance heat transfer and improve its durability in utilizing solar vacuum tubes.

지식경영 시스템을 활용한 프로세스 향상이 e-Business 성과에 미치는 영향에 관한연구

현준호 韓國外國語大學校 2002 국내석사

Design of an Application-Specific Instruction-Set Processor-based Configurable LED Panel Controller

현준호 포항공과대학교 일반대학원 2017 국내박사

Light-emitting diodes (LEDs) have attracted attention for their use in large-scale display panels. LEDs have advantages such as power efficiency, high brightness, long life, and eco-friendliness. Naturally, the use of LED display systems has increased significantly on the streets and indoors owing to their use as engaging and effective information-display panels. Applications for LED display systems include high-quality scoreboards in sports stadiums, large screens in concert halls, and video signboards on the exterior walls of commercial buildings. The sizes, resolutions, and aspect ratios of these LED display systems depend on the intended application. High-resolution LED displays are composed of a number of LED panels and can be easily changed these resolution and aspect ratio by rearranging LED panels. An LED panel is driven by an LED controller which generally employs a pulse width modulation (PWM) to display images. However, the PWM-based control has two main concerns: flickering and inrush current. In order to avoid flickering, it is required to use a high-speed controller. On the other hand, the inrush current problem that occurs when many LED pixels are driven simultaneously can be avoided by spreading out the peak current. Conventional sophisticated LED controllers have been designed to provide high-operating speed to alleviate flickering phenomenon. However, these controllers do not consider changing the structure of the LED panels and PWM schemes of the LED panels. There are various PWM schemes and new algorithms are still being proposed. Accordingly, the LED controller requires flexibility when implementing its PWM scheme to replace algorithm with the state-of-the-art PWM scheme without having to redesign the its hardware. Frequent changes to the LED panel structure also require the flexibility of the LED controller. Microprocessor-based controllers are one solution to provide the necessary flexibility. However, these controllers do not guarantee real-time operation. This dissertation proposes a new LED controller that consists of an application-specific instruction-set processor (ASIP) and custom hardware modules. The ASIP of the proposed LED controller provides a specialized architecture for flexibility in control scheme as well as the real-time operation without flickering. The proposed LED controller separately stores the LED pixel data in different memory banks corresponding to given position in each of the binary numbers, that is fast and convenient to handle the data used to represent the gray levels using PWM methods. Moreover, the proposed controller also uses a custom hardware module to automatically generates a sequence of memory addresses while considering the display resolution for the LED data and to reduce data preparation time. The proposed LED controller was implemented as a prototype on a Xilinx Viertex-5 field-programmable gate array (FPGA) platform. The prototype of the proposed LED controller ran at 100 MHz, and it successfully drove three types of LED panels having 64 × 96, 96 × 80, and 128 × 64 pixels at refresh rates of 3,125, 2,232, and 1,736 Hz, respectively. In addition, the proposed LED controller could drive 1.44 times more pixels per unit time at the same refresh rate compared with the state-of-the-art hard-wired type LED controller.

Development of a Silica Gel Adsorption Desalination System Utilizing Low Temperature Heat Sources

현준호 제주대학교 대학원 2014 국내박사

항공기 무장투하정확도 시험평가 방법에 관한 연구

현준호 국방대학교 2006 국내석사

추적자 실험에 의한 정수지의 소독 효율(CT value) 평가와 염소 투입량 최적화에 관한 연구

현준호 고려대학교 2000 국내석사