• Journal of Korea Society of Industrial Information Systems
• /
• v.14 no.5
• /
• pp.75-82
• /
• 2009

It is possible that gain good effect for saving electric charges by power-saving education to organizer, instead of buying new energy saving computer in the company, school and public organization. But this kind of education needs time very much. And power management system for controling whole computer of organizer is released, but it is hard to set up. In this paper we prevent computers which do not have power shutdown software, from obtaining IP address by DHCP. So we induce organizer to setup power shutdown software.

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2023.11a
• /
• pp.167-168
• /
• 2023

에너지분야 국가핵심기반시설에서 산업재해 및 업무중단 사고예방을 위해 재해경감활동관리체계(BCMS)에서 일일위험지수 재난안전관리 프로그램을 자체개발 운용하여 정부의 중대재해 감축 로드맵의 핵심적인 4대 전략 중 하나인 사업장에서 유해위험요인에 대한 자기규율적인 예방관리체계의 확립한 사례를 제시하였다. 이에 대한 신뢰성 검증을 위해 중대산업재해 감축효과에 영향을 미친 사업장의 BCMS, 일일위험지수 및 중대재해처벌법 간의 관계성을 연구한 결과, 제도 간 개념의 관련성이 높으며, 상호 보완적이고 영향을 미치는 것으로 확인되었다. 따라서 동종 사업장에서 재해경감활동관리체제의 일일위험지수를 활용한다면 중대재해예방관리에 도움이 될 것으로 기대된다.

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2023.11a
• /
• pp.175-177
• /
• 2023

본 연구는 코로나19 대응을 위한 업무연속성계획의 가동 경험을 분석하여 체계를 개선한 내용을 다루고 있다. 코로나19는 전 세계적으로 팬데믹을 일으킨 대유행병으로, 감염병 확산으로 인한 위기 상황에서 업무연속성을 확보하는 것이 중요하다. 전력에너지 공기업은 위기대응 체계를 구축하고 필수 대응 사례를 분석하여 업무연속성을 유지하는 방안을 모색하였다. 이를 위해 근무환경 분리, 핵심인력 확보, 비상대응 업무계획 수립 등 다양한 대책을 시행하였다. 코로나19 상황에서 전력에너지 공급업무의 연속성 확보를 위한 이러한 대책들은 효과적으로 시행되었고, 감염병 재난관리에 대한 매뉴얼로 활용하고 있다.

• International Journal of Advanced Culture Technology
• /
• v.12 no.2
• /
• pp.402-408
• /
• 2024

The purpose of this research is to discuss the development history and future strategy of Geely Automobile Group Co., Ltd. Founded in 1997, Geely Automotive Group has grown from a small workshop to one of China's leading automakers after nearly three decades of development.This paper first reviews the development of Geely Automobile, from the initial small-scale production to the current global layout and diversified product line. Secondly, it analyzes the challenges and opportunities faced by Geely Automobile, including the intensification of market competition and the changing demand for technological innovation.And put forward the future development strategy of Geely Automobile, including improving the quality of products, expanding the international market and promoting the development of new energy vehicles. By analyzing the development history and future strategy of Geely Automobile Group Co., Ltd., we can better understand the company's position and future development direction in China's automobile industry.

• Steel and Composite Structures
• /
• v.50 no.4
• /
• pp.459-474
• /
• 2024

Classical and first-order nonlocal beam theory are employed in this study to assess the thermal buckling performance of a small-scale conical, cylindrical beam. The beam is constructed from functionally graded (FG) porosity-dependent material and operates under the thermal conditions of the environment. Imperfections within the non-uniform beam vary along both the radius and length direction, with continuous changes in thickness throughout its length. The resulting structure is functionally graded in both radial and axial directions, forming a bi-directional configuration. Utilizing the energy method, governing equations are derived to analyze the thermal stability and buckling characteristics of a nanobeam across different beam theories. Subsequently, the extracted partial differential equations (PDE) are numerically solved using the generalized differential quadratic method (GDQM), providing a comprehensive exploration of the thermal behavior of the system. The detailed discussion of the produced results is based on various applied effective parameters, with a focus on the potential application of nanotubes in enhancing sports bikes performance.

• Advances in nano research
• /
• v.17 no.5
• /
• pp.455-461
• /
• 2024

Recently, fashion design demanded more comfort and functionality. Addition of nanoparticles into fabrics can be one new method of enhancing comfort with vibration dampening. This paper investigates the influence of the addition of nanoparticles on the vibrational properties of textiles that can be used in fashion. The vibration properties of the nanoparticle-enhanced fabrics are mathematically modeled. Shaking and magnetic stirring with ultrasonic treatments are considered in combination with mechanical mixing before the production of fabric samples in order to overcome the problem of nanoparticle dispersion. Sinusoidal shear deformation theory is used for the structural modeling, whereas the Mori-Tanaka model is used to estimate the effective properties of the nanoparticle-reinforced fabrics with consideration of the agglomeration effect. Energy methods enable the derivation of the motion equations for the calculation of the vibration frequencies of the fabric. This study investigates the effects of nanoparticle volume percentage, their agglomeration, and fabric structure on the characteristics related to vibration damping and comfort. It follows that increased nanoparticle content improves vibration damping, thereby opening possibilities for comfortable and durable garment designs.

• Journal of the Korean Society of Radiology
• /
• v.13 no.7
• /
• pp.969-977
• /
• 2019

Applying the bismuth shield used to reduce the radiation exposure, image quality may be reduced due to beam hardening caused by the shield during CT scan. Therefore, we tried to find out the energy range that can reduce image degradation by applying GSI mode of G company's dual energy CT and examine the possibility through experiment. As a result, after bismuth shielding, 118 ± 10.6 HU and 50.1 ± 14.6 HU at 50 keV after dual-energy CT scan were the most similar to the CT value before image deterioration(p> 0.05). It was measured 176.6 ± 7.1 and 138.3 ± 1.1 at 50 keV(p> 0.05). Experiments showed that the use of the shield during CT inspection inevitably degrades the image quality, but experiments show that the GSI function of the dual energy CT can maintain the image quality even when the shield is used. If the various shields are secured after the evaluation using the dual energy CT, it is expected to overcome the disadvantages of poor image quality caused by the use of the radiation shield for reducing the exposure, which is the biggest disadvantage of the CT scan.

• Journal of Radiation Protection and Research
• /
• v.40 no.2
• /
• pp.110-117
• /
• 2015

Recently, Due to the increased industry using radiation inspection equipment in the semiconductor, this demand of technology research is increasing. Although semiconductor inspection equipment is using low energy X-ray from 40 keV to 120 keV, Studies of radiation damage about the low energy X-ray are lacking circumstance in our country. Therefore, It is study that BJT (bipolar junction transistor) of one type of semiconductor elements are received radiation damage by low energy X-ray. BJT were used to the NXP semiconductor company's BC817-25 (NPN type), and Used the X-ray generator for the irradiation. Radiation damage of BJT was evaluated that confirm to analyse change of collector-emitter voltage of before and after X-ray irradiation when current gain fixed to 10. X-ray generator of tube voltage was setting 40 kVp, 60 kVp, 80 kVp, 100 kVp, 120 kVp and irradiation time was setting 180s, 360s, 540s into 180s intervals. As the result, We confirmed radiation damage in BJT by low energy X-ray under 120 keV energy, and Especially the biggest radiation damage was appeared at the 80 kVp. It is expected that ELDRS (enhanced low dose rate sensitivity) phenomenon occurs on the basis of 80 kVp. This studies expect to contribute effective dose administration of semiconductor inspection equipment using low energy X-ray, Also Research and Development of X-ray filter.

• Journal of Electrical Engineering and Technology
• /
• v.13 no.6
• /
• pp.2412-2420
• /
• 2018

The thermal degradation of low density polyethylene (LDPE) will accelerate the production of carbonyl groups (C=O), which can act as the induced dipoles under high voltage. In this paper, we researched the dielectric properties and space charge behavior of LDPE after thermal aging, which can help us to understand the correlation between carbonyl groups (C=O) and electrical properties of LDPE. The spectra results show that LDPE exhibit obvious thermooxidative reactions when the aging time is 35 days and the productions mainly contain carboxylic acid, carboxylic eater and carboxylic anhydride, whose amount increase with the increasing of aging time. The dielectric properties show that the real permittivity of LDPE is inversely proportional to temperature before aging and subsequently become proportional to temperature after thermal aging. Furthermore, both the real and imaginary permittivity increase sharply with the increasing of aging time. The fitting results of imaginary permittivity show that DC conductivity become more sensitive about temperature after thermal aging. On this basis, the active energies of materials calculated from DC conductivity increase first and then decrease with the increasing of aging time. In addition, the space charge results show that the heterocharges accumulated near electrodes in LDPE change to the homocharges after thermal aging and the mean volume charge density increase with the increasing of aging time. It is considered that the overlaps caused by electrical potential area is the main reason for the increase of DC conductivity.

• Journal of the Korean Society of Safety
• /
• v.32 no.3
• /
• pp.90-98
• /
• 2017

The purpose of this study was to examine the effect of employment type(direct employment, dispatch and service supplier) on risk factor exposure, health and satisfaction. The data of the 4th wave of Korean Working Conditions Survey (KWCS) conducted by Korea Occupational Safety and Health Agency (KOSHA) in South Korea was used. Business support service industry and manufacturing industry were selected as appropriate industries for analysis. In the final analysis, 5,865 in the manufacturing industry and 1,361 in the service support industry were included. Various variables related risk, safety, satisfaction and health such as risk factor exposure, MSDs exposure, work environment satisfaction, injury probability, dangerous work, workload, physical health problem, perceived health, positive emotions, stress, participation for decision making and experience of accident/disease were analyzed and company size and age was controled. An ANCOVA was conducted to identify significant mean differences of risk, safety, satisfaction and health related variables among direct employed workers, dispatch and service supplier workers. The results showed that all the variables except stress showed a significant difference depending on employment type in the service supply industry. In the manufacturing industry, there were significant difference in the risk factor exposure, MSDs exposure, work environment satisfaction, workload, physical health problem, perceived health, and participation depending on employment type. These results indicated that the risks are unloaded to subcontract and outsourcing company workers. Based on these results, the implications of this study and suggestions for future research were discussed.