• Journal of Astronomy and Space Sciences
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• 제22권2호
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• pp.175-186
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• 2005

본 논문에서는 정지궤도 통신위성인 무궁화위성 3호 버스 시스템을 모델로 하여 확장칼만필터를 이용한 자세결정 알고리즘을 개발하고 그 설계 결과를 시뮬레이션을 통해 제시하였다. 특히, 정확한 추정을 위한 칼만필터의 필터 이득을 결정하기 위해서는 초기에 입력된 추정변수들의 값에 변동이 없는 상황을 가정하게 되는데 본 연구에서는 2Hz 로 자세제어도 동시에 수행하면서 필터이득을 구하여 추정변수들의 값에 변동이 있는 상황에서도 필터가 정상적으로 동작됨을 보였다. 최종적으로 필터를 사용하지 않은 경우와 사용한 경우를 고려하여 4축 자이로의 각 바이어스가 있는 경우 및 개별적으로 자이로가 고장이 난 경우의 시뮬레이션 결과를 통해 설계된 필터가 자이로 이상상태를 대처할 수 있음을 검증하였다.

• 대한인간공학회지
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• 제29권4호
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• pp.405-422
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• 2010

Occupational musculoskeletal disorders currently account for the largest proportion of the occupational illnesses in Korea. In this research, status of musculoskeletal disorders among the occupational illnesses was examined through workers' compensation claims data. Types and characteristics of musculoskeletal disorders were looked at other data set as well. The data sets included epidemiological investigation data reported by Occupational Safety and Health Research Institute, and data collected from occupational disease surveillance reports and Korean occupational health-related scientific journals. Number of cases, incidence rate and insurance benefits for occupational musculoskeletal disorders in Korea are increasing every year. In addition, musculoskeletal disorders occurrence is shifted from large enterprises group to small-and-medium group, from manufacturing to service sector, and from production workers to office and professional workers. Although low back pain is still most common, its occurrence characteristics is gradually shifted from traumatic to cumulative while musculoskeletal disorders are somewhat seemingly moved from lumbar to upper limb body part. Musculoskeletal disorders were observed to be more diverse and prevalent in epidemiological investigations or surveillance data rather in workers' compensation claims data. Musculoskeletal disorders occurrence is related to demographic factors, occupational psychosocial factors, and ergonomic risk factors at workplace for which appropriate preventive measures needed to be made accordingly.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2005년도 전기학술대회논문집
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• pp.700-707
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• 2005

The human being continued the processing of improvement for well being life according to scientific results The other hand, All the seaman life take the rest and sleep in ship's office and living room. In this case, many crew took the pain of back spain or deposit the his fatigue, This will be decrease the productivity owing to crew's back spain or fatigue etc. In this study researched the problem of ship's bed mattress and the principle of Well being air mattress in technical standard etc. Specially decreased some kinds of bacillus, germ and many kinds of bacteria by using of tourmaline which emitted the far red light and negative ion from surface of the mattress. We developed and applied the ship's Well being air mattress to off shore and various kind of ship by International Labour Organization convention 192.

• 한국의류학회지
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• 제32권5호
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• pp.681-691
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• 2008

Taking into consideration both the inconveniences reported with current working uniform for the aircraft mechanics and the subjects' requirements mentioned in preceded survey, the researchers designed an ergonomic sample garments with improved motional flexibility and comfort. To improve motional flexibility, extra folds were added to the back of the garments to allow for ease of motion of limbs, so that the material would not be drawn up by the motion of the arms. Darts were added to the elbow, hip, the knee. Furthermore, by increasing the length of the waist centerline, the hip region would not be drawn up. For improved comfort, $CoolMax^{(R)}$ was used as lining material for the armpit and back region to discharge swear promptly. Subjects and panels were asked to evaluate the sample garment that followed an ergonomic design and pattern. According to the results, the sample garment was evaluated more highly than the existing working uniform in appearance and motional flexibility. The field tests by three aircraft mechanics working in the Office of Forestry were also demonstrated that the sample garment was advanced in terms of motional flexibility and comfort.

• Journal of Information Technology Applications and Management
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• 제18권1호
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• pp.125-141
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• 2011

As the sales volume of online shops increases, the job burden in the back-offices of the online shops also increases. Order picking is the most labor-intensive operation among the jobs in a back-office and mid-size pure click online shops are experiencing the time delay and complexity in order picking nowadays while fulfilling their customers' orders. Those warehouses of the mid-size shops are based on manual systems, and as order pickings are repeated, the warehouses get a mess and lots of products in those warehouses are getting missing, which results in severe delay in order picking. To overcome this kind of problem in online clothing shops, we research a methodology to locate warehousing products. When products arrive at a warehouse, they are packed into a box and located on a rack in the warehouse. At this point, the operator should determine the box to be put in and the location on the rack for the box to be put on. This problem could be formulated as an Integer Programming model, but the branch-and bound algorithm to solve the IP model requires enormous computation, and sometimes it is even impossible to get a solution in a proper time. So, we relaxed the problem, developed a set of heuristics as a methodology to get a semi-optimum in an acceptable time, and proved by an experiment that the solutions by our methodology are satisfactory and acceptable by field managers.

• 치위생과학회지
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• 제8권1호
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• pp.35-42
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• 2008

본 연구는 수도권, 서울, 전북지역의 치과위생사를 대상으로 2006년 7월부터 8월까지 실시한 656명에 대하여 자기 기입식 설문조사방식으로 치과위생사가 근무하는 병원환경에 대한 상태와 건강에 영향을 주는 요인, 치과위생사의 병원실내질환경 만족에 영향을 주는 환경요인 등에 차이점을 발견할 수 있는지를 파악하여 치과위생사의 건강관리를 위한 실내근무환경 개선과 신체자각증상 감소방안을 제시하고자 하였다. 1. 병원근무환경에 대한 주관적 평가를 통한 만족도를 분석한 결과 병원의 공기가 신선하다(2.51), 병원의 공기냄새가 기분 좋게 한다(2.71), 병원의 환기(2.84)로 실내공기질에 대한 만족도가 낮았다. 2. 자각증상경험정도에 대한 반응은 "등, 어깨, 목이 아프거나 뻣뻣하다"(3.50~3.67), "피곤하거나 졸리며 피로를 느낀다"(3.26~3.59)가 높게 나타났다. 3. 병원실내환경 만족도에 영향을 주는 요인은 병원 공기냄새가 가장 높게 나타나 실내공기질이 병원실내 환경 만족에 영향을 주는 주요한 요인이라는 결론을 얻었다. 그 외에도 병원 실내온도, 병원의 조명, 병원환기, 병원의 시끄러움, 병원공기 신선도 순으로 영향을 주었다. 4. 실내공기질에 따른 자각증상경험정도에 영향을 주는 요인은 "본인이 느끼는 건강상태"(p < 0.001), "화학물질 민감"(p < 0.001) 및 "냉난방 방식"(p < 0.001)순으로 나타났다. 5. 근무환경 만족도를 조사한 결과 실내공기질의 만족도가 가장 낮은 것으로 나타났으며, 이는 건물이 밀폐형이고 하루 환기횟수가 절대 부족하기 때문으로 파악되었다.

• 한국경제지리학회지
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• 제12권4호
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• pp.681-701
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• 2009

본고는 1912년부터 부산에 존재했던 경남(구포)은행, 동래은행과 부산상업은행이 매수 합병된 1935년경까지 은행의 설립과 경영상의 특징, 합병과정과 이를 통해서 나타난 조선총독부의 은행합병 정책의 성격 등을 살펴보고자 했다. 이세 은행의 대주주나 경영자들은 자신들의 기업체 운영에 은행 자금을 이용하려 했다. 1919년대에 들어서 영업부진에 빠진 경남은행은 1928년에 대구은행과 합병하여 대구상공은행이 되었고, 1928년의 개정된 은행령에 규정된 자본금 200만 원을 채우지 못한 동래은행은 광주의 호남은행에, 부산상업은행은 부실대출이 화근이 되어 1935년에 일본인이 소유-지배하는 조선상업은행에 흡수되었다. 부산의 금융계는 경기변동에 효과적으로 대응하지 못했거나 총독부에 대해 자신의 이해를 대변해 줄 경제단체를 전혀 갖추지 못했고, 조선총독부는 은행 합병을 통해서 식민지 경제에 대한 통제력를 강화해갔다.

• 한국산업보건학회지
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• 제8권1호
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• pp.146-154
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• 1998

This study was designed to investigate the workers' exposure level to electromagnetic field(EMF) in accordance with the VDT arrangement in the work place and distance from VDT. Author compared the exposure strength of EMF in line group(workers exposed to EMF from both front and back side) and in shielding group(workers exposed to EMF exclusively from front side). The levels of EMF at 30cm and 50cm from front side and at 30cm from back side of VDT were also measured. The result were as follows: 1. Mean distance between a monitor and a worker in shielding group ($47.7{\pm}8.7cm$) significantly longer than that in line group($44.3{\pm}7.2cm$). Strength of EMF in shielding group [$1.3{\pm}0.7V/m$ (electric field) and $18.2{\pm}11.5mA/m$ (magnetic field) were lower than in line group [$1.4{\pm}0.6V/m$ and $26.6{\pm}11.6mA/m$, respectively] at the workers' position. 2. The strength of EMF was decreased with the distance from VDT. The strength at 70cm from VDT was nearly the same as the background strength in the ordinary office rooms. 3. Working distance from 9 inch monitor was significantly shorter than that from 14 inch and wider sized monitors. 4. The strength of EMF in extremely low frequency spectrum of color monitors was higher then that of black and white monitor. 5. Metal coated filters significantly decreased the electric field strength of EMF when earth line was connected. Metallic shield was effectively decreased the EMF strength from VDT, but wooden shield was not. From the above results, line type arrangement of VDT in the work place using metallic shield at the back side of VDT, and metal coated filter to monitor with application of earth line were recommended. It is also recommended to maintain workers position to be 60cm or more distance from monitor and 140cm or more between VDTs for minimizing workers' exposure to EMF.

• Fisheries and Aquatic Sciences
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• 제20권9호
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• pp.21.1-21.10
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• 2017

The aim of this study was to assess visible implant fluorescent elastomer (VIE) tagging and stress response in marine medaka, Oryzias dancena. The experimental fish were anesthetized individually and marked with red, yellow, or green elastomer at each of the following three body locations: (1) the abdomen, (2) the back, and (3) the caudal vasculature. During 12 months, the accumulated survival rates of fish in the experimental treatments were not different among red, yellow, and green elastomers. The experimental fish retained > 85% of the tags injected in the back, > 70% of the tags injected in the caudal vasculature, and > 60% of the tags injected in the abdomen (P < 0.05). An important observation was that the abdomen site was associated with poor tag retention. For all injected sites, the red and green tags were able to be detected more easily than the yellow tags when observed under both visible and UV lights. Tag readability was lower for the abdomen site than for the other sites (back and caudal vasculature). Thus, VIE tags were easy to apply to marine medaka (< 1 min per fish) and were readily visible when viewed under UV light.

• Korean Circulation Journal
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• 제52권10호
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• pp.785-794
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• 2022

Background and Objectives: Self-monitoring of blood pressure (SMBP) is a reliable method used to assess BP accurately. However, patients do not often know how to respond to the measured BP value. We developed a mobile application-based feed-back algorithm (SMBP-App) for tailored recommendations. In this study, we aim to evaluate whether SMBP-App is superior to SMBP alone in terms of BP reduction and drug adherence improvement in patients with hypertension. Methods: Self-Monitoring of blood pressure and Feed-back using APP in Treatment of UnconTrolled Hypertension (SMART-BP) is a prospective, randomized, open-label, multicenter trial to evaluate the efficacy of SMBP-App compared with SMBP alone. Patients with uncomplicated essential hypertension will be randomly assigned to the SMBP-App (90 patients) and SMBP alone (90 patients) groups. In the SMBP group, the patients will perform home BP measurement and receive the standard care, whereas in the SMBP-App group, the patients will receive additional recommendations from the application in response to the obtained BP value. Follow-up visits will be scheduled at 12 and 24 weeks after randomization. The primary endpoint of the study is the mean home systolic BP. The secondary endpoints include the drug adherence, the home diastolic BP, home and office BP. Conclusions: SMART-BP is a prospective, randomized, open-label, multicenter trial to evaluate the efficacy of SMBP-App. If we can confirm its efficacy, SMBP-App may be scaled-up to improve the treatment of hypertension.