• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2002년도 추계학술발표논문집 (중)
• /
• pp.1023-1026
• /
• 2002

The demand for Wireless LAN (WLAN) access to use their network and the Internet is surged dramatically over the past year. Since WLAN provides users' access from anywhere in the workplace without having to plug in, it therefore leads the WLAN market to grow steadily. Unfortunately, the first WLAN implementation designed primarily for home networking did little to address these security issues. Moreover, although the 802.11b standard published by IEEE in 1999 improved WLAN connections LAN-equivalent speed and security from the 802.11 standard. However, there still are several flaws such as the weaknesses in the Authentication and WEP encryption schemes in the IEEE 802.11 WLAN standard. In this paper, we propose WLAN architecture for providing the strong centralized authentication, encryption, and dynamic key distribution on a WLAN. Additionally, this proposed architecture is able to support roaming users and is flexible and extensible to future developments in the network security.

• Safety and Health at Work
• /
• 제7권4호
• /
• pp.347-353
• /
• 2016

Background: This study aimed to investigate the relation between key strike forces and musculoskeletal symptoms (MSS). Moreover, this study presents a key strike force measurement method to be used in a workplace setting. The correlation between key strike force characteristics and MSS was previously studied, but the measurement methods used either a single-key switch or force platforms applied under the keyboard. Most of the studies were conducted in a laboratory setting. The uniqueness of measurement methods in the current study is their ability to measure forces applied to a specific key in a workplace setting and to provide more information about specific key strike forces during typing. Methods: Twenty-four healthy computer workers were recruited for the study. The demographic questionnaire, and self-reported questionnaires for psychosocial status (General Nordic Questionnaire for Psychological and Social Factors at Work) and for detecting MSS were filled up, which later helped in dividing the participants into two groups (12 participants with pain and 12 without pain). Participants typed a predetermined text that utilized the instrumented keys multiple times. The dynamic forces applied to the keys were recorded and collected, using four thin and flexible force sensors attached to the preselected keys according to their location. Results: The results demonstrated that participants with high levels of MSS, specifically in the back and neck, in the last year exerted significantly higher key strike forces than those with lower levels of symptoms (p < 0.005). Conclusion: The key strike force exerted while typing on a keyboard may be a risk factor for MSS, and should therefore be considered in ergonomic evaluations and interventional programs.

• 전자공학회논문지SC
• /
• 제46권4호
• /
• pp.58-63
• /
• 2009

각종 전자 제품 및 부품의 외관 검사는 인간의 시력에 의해 이루어졌다. 외관 검사는 LCD Panel, flexible PCB 및 다른 여러 가지 전자부품에 적용되어진다. 전자 제품의 외관검사를 사람의 시력에 의존할 경우 작고 미세한 전자 제품은 검사자의 신체와 정신에 따라 검사 결과가 변화하기 때문에 안정적인 결과를 기대 할 수 없다. 머신비전 시스템은 이러한 문제가 발생되지 않는다. 따라서 머신 비전 시스템은 현제 여러 외관 검사 분야에서 사용되어지고 있다. 하지만 머신 비전 시스템에 의한 자동 검사는 작업장의 조명에 의한 영향을 많이 받는다. 본 논문에서는 이러한 영향을 극복하기 위한 방법으로 히스토그램변환을 이용한 머신비전 검사의 정확성 향상 방법을 제안한다.

• 한국안전학회지
• /
• 제30권1호
• /
• pp.119-126
• /
• 2015

The primary purpose of the general duty clause is to offer an extra measure of protection to employees in the workplace. Most standards implemented under OSHA are targeted at a specific hazard. The general duty clause, however allows inspectors to cite employers for exposing its employees to a recognized hazard that has not been specifically addressed in the regulations. Congress intended the general duty clause to be a limited means of advancing the purposes of the OSHAct. But OSHA has not always regarded the general duty clause as the limited means for protecting the safety and health of employees that Congress intented. OSHA attempted to expand the scope of the general duty clause, at times improperly, to make it a more flexible enforcement tool. OSHA's interpretation of each of the restrictions on the scope of the clause has changed over the years. In recent years the general duty clause has been utilized as a sometimes controversial mechanism for enforcement of safety guidelines that have not yet been specifically addressed by statute or regulation. The most notable example of this was application of the general duty clause to ergonomic hazards.

• 공업화학
• /
• 제20권5호
• /
• pp.547-552
• /
• 2009

본 연구에서는 fiber reinforced plastics (FRP) 제품 가공시 발생하는 분진 및 악취 물질로 인한 작업현장의 악조건을 개선하기 위하여 activated carbon fiber (ACF) 장착 하이브리드 백필터를 개발하였다. FRP 제조업체 2개사에 ACF 백필터를 설치함에 있어 천장, 벽하단 부분에 덕트를 설치함은 물론 이동식 집진 덕트를 설치함으로써 집진효율을 높였다. 펄스젯트식 탈진방식을 채택하여 효과적인 시스템 운영을 유도함으로써 작업환경을 개선하고자 하였다. 하이브리드 백필터 시스템 운용시 이에 따르는 분진과 악취에 대한 제거동향을 고찰하였다.

• 한국산업보건학회지
• /
• 제8권1호
• /
• pp.76-87
• /
• 1998

The concentration of welding fume was measured by 221 welders themselves in chassis frame workplace of the manufactory from February, 1, 1996 to May, 31, 1997. Welding parameters were the welding current and the distance between helmet and arc. Those two optimum conditions were proposed by excess probability analysis using logistic regression, so the best position in the workplace was proposed considering two factors to control the welding fume. The results are as followings; 1) The excess proability of welding fume TLV was over 99% in above 260 Amperes of welding current and also in below 30cm of distanced between helmet and arc. 2) The equation from logistic regression analysis using SPSS/PC+5.02 had the welding current as a independent variable and the excess of welding fume TLV as a dependent variable (p<0.05). Logit(welding fume TLV) = 0.1296 ${\times}$ wlding currnet - 28.8750 3) The equation from logistic regression analysis using SPSS/PC+5.02 had the distance between helmet and arc as a independent variable and the excess of welding fume threshold limit value a, a dependent variable (p<0.05). Logit (welding fume TLV) = -0.6809 ${\times}$ distance between helmet and arc +25.1665 4) Considering both cases or 2) and 3). the result equation is following. (p<0.05). Logit (welding fume TLV) = 0.1346 ${\times}$ welding current -0.3859 ${\times}$ distance between helmet and arc -15.7382 5) The excess probability of welding fume threshold limit value was 100% in above 240 Ampere of welding current. Thus, below 220 Ampere can be suggested to reduce the 40% number of welders who have a excess welding fume threshold limit value. 6) The excess probability of welding fume TLV was 100% in below 34cm of distance between helmet and arc. Thus, over 38cm can be suggested to reduce the 33% number of welders who have a excess welding fume TLV. 7) Considering both 5) and 6) cases, first of all, the best welding current can be 200 Ampere to have a below 15% of welding fume excess probability for the welders who works in distance of 34-37cm. Secondly, to have a below 30% excess probability of welding fume TLV, the working distance must be over 38cm in 220 Ampere and 32cm in 200 Ampere. 8) To reduce the average exposure concentration of welding fume ($8.21{\pm}5.83mg/m^3$), the movable local exhaust system equipped with flexible hoods can be used.

• 한국재난정보학회 논문집
• /
• 제19권4호
• /
• pp.806-814
• /
• 2023

연구목적: 고용노동부의 산업안전보건법에 따르면 산업재해를 막기 위해 급박한 위험이 닥쳤을 때는 작업중지권을 행사할 것을 규정하고 있다. 본 연구는 실제 태풍과 같이 급박한 위험이 닥쳤을 때 사업장에서 사업주에 의한 작업중지권 이행여부에 대한 실태조사를 수행하였고, 그 결과에 따른 시사점 및 작업중지권 활성화를 위한 방안을 도출하고자 한다. 연구방법: 제6호 태풍 '카눈'의 영향이 컸던 8월 9일~10일, 2일간 사업장의 작업중지 실시 여부를 유선으로 확인하였고, 조사대상은 건설업 1,649개소, 제조업 830개소, 그리고 기타 업종 278개소로 총 2,757개소이다. 연구결과: 실태조사 결과를 보면, 8월 9일에는 56%(1,555개소), 8월 10일에는 77%(2,142개소)가 전면 또는 부분 작업중지를 실시하였다. 특히, 태풍이 상륙했던 8월 10일에는 전체 40%가 전면적으로 작업을 중지하였다. 결론: 본 연구를 통해 사업주에 의한 작업중지권이 실제 사업장에서 활용되고 있음을 확인하였다. 앞으로도 급박한 위험이 있는 경우에는 작업중지권 외에도 유연 및 재택근무, 근로시간 조정 등을 적극적으로 활용하여 근로자의 안전을 보장하고 생명을 보호해야 할 것이다.

• Safety and Health at Work
• /
• 제2권1호
• /
• pp.9-16
• /
• 2011

The majority of people diagnosed with diabetes mellitus are in the working age group in developing countries. The interrelationship of diabetes and work, that is, diabetes affecting work and work affecting diabetes, becomes an important issue for these people. Therapeutic options for the diabetic worker have been developed, and currently include various insulins, insulin sensitizers and secretagogues, incretin mimetics and enhancers, and alpha glucosidase inhibitors. Hypoglycemia and hypoglycaemic unawareness are important and unwanted treatment side effects. The risk they pose with respect to cognitive impairment can have safety implications. The understanding of the therapeutic options in the management of diabetic workers, blood glucose awareness training, and self-monitoring blood glucose will help to mitigate this risk. Employment decisions must also take into account the extent to which the jobs performed by the worker are safety sensitive. A risk assessment matrix, based on the extent to which a job is considered safety sensitive and based on the severity of the hypoglycaemia, may assist in determining one's fitness to work. Support at the workplace, such as a provision of healthy food options and arrangements for affected workers will be helpful for such workers. Arrangements include permission to carry and consume emergency sugar, flexible meal times, selfmonitoring blood glucose when required, storage/disposal facilities for medicine such as insulin and needles, time off for medical appointments, and structured self-help programs.

• International Journal of Quality Innovation
• /
• 제6권3호
• /
• pp.95-120
• /
• 2005

Utilization of information and communication technologies is commonly accepted as important to value creation in the knowledge economy. Nevertheless, empirical findings from our business case studies often show that while sophisticated technological tools may be developed, the potentials are not realized. It is evident that technology is subject to adaptive and emergent strategies of use, diverging from the original intention. Within this space of opportunities, we elaborate the importance of constructing strategic concepts as communication tools to support organisational implementation of technologies. We use the concept of organisational implementation as a way of taking the technology into use in order to support changes and value creation in the user organisation. In this paper we present our findings related to how use and experiences are conditioned by the users' expectations. We have conducted a business case study in order to understand and explore how users employ and use a particular wireless technology infrastructure. On behalf of the infrastructure vendor, we have studied three different organisations that use this technology. The overall research goal of our joint research project was to find out what is good use and for whom. We find that users struggle to go beyond the expectations they had when they were conceptualising and telling us about their practice. We have good indications that a narrowed consciousness was also conditioning the users' use of the technology. In this paper we draw the conclusion that technological implementations towards changing work practices and value creation must not be viewed by the company solely as a knowledge acquisition process, but as a process of knowledge creation. Organisational implementation is an ongoing process, a learning process at both the organisational and individual level. Flexible tools and technologies are constituted and shaped in interaction and communication in the workplace. Based on that knowledge, we build up an argument for an organisational implementation framework, including strategic discussions, learning spaces, and concept constructions.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2006년도 정기학술발표대회 논문집
• /
• pp.523-528
• /
• 2006

건설자재관리는 건설프로젝트를 수행하는데 있어 중요한 관리 요인 중 하나이며, 공정을 수행하는데 필요한 자재의 공급이 원활하지 못하면 공기지연, 공사비 증대, 작업 효율 저하 등의 문제점을 발생시킬 수 있다. 적시 적소에 자재를 투입하기 위하여 자재의 정확한 위치 파악이 필요하다. 위치 파악 기술로는 GPS, 적외선 통신 시스템(Active Badge), 영상 인식 시스템(EasyLiving} 등이 있으나 건설현장에 적용하기에는 기술적 한계가 있다. 따라서 자재의 정보 및 위치를 파악하기 위해서 현재 사회전반에 걸쳐 대두되고 있는 RFID기술과 무선 네트워크 기술을 이용한 자재 위치 파악의 기술적 가능성을 검토하고, 이 두 기술을 활용한 자재 위치 파악 방안을 제안한다.