• Title, Summary, Keyword: Work Efficiency

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The Influence of the Wafer Resistivity for Dopant-Free Silicon Heterojunction Solar Cell (실리콘 웨이퍼 비저항에 따른 Dopant-Free Silicon Heterojunction 태양전지 특성 연구)

  • Kim, Sung Hae;Lee, Jung-Ho
    • Journal of the Korean institute of surface engineering
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    • v.51 no.3
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    • pp.185-190
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    • 2018
  • Dopant-free silicon heterojunction solar cells using Transition Metal Oxide(TMO) such as Molybdenum Oxide($MoO_X$) and Vanadium Oxide($V_2O_X$) have been focused on to increase the work function of TMO in order to maximize the work function difference between TMO and n-Si for a high-efficiency solar cell. One another way to increase the work function difference is to control the silicon wafer resistivity. In this paper, dopant-free silicon heterojunction solar cells were fabricated using the wafer with the various resistivity and analyzed to understand the effect of n-Si work function. As a result, it is shown that the high passivation and junction quality when $V_2O_X$ deposited on the wafer with low work function compared to the high work function wafer, inducing the increase of higher collection probability, especially at long wavelength region. the solar cell efficiency of 15.28% was measured in low work function wafer, which is 34% higher value than the high work function solar cells.

Development of a Human Interface System for the IMS, - Application of the Teleoperation System - (IMS를 위한 Human Interface 시스템 개발 - 원격제어 시스템의 활용 -)

  • 차인혁;한창수;이병주
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.156-164
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    • 1998
  • IMS is a more advanced manufacturing system than FMS. However, IMS do not have sufficient performance for the work in the various and uncertain environment, because of the difficulty of the work and occurrence of the unexpected condition. If IMS is hard to work properly, teleoperation system can support it by using the human's consideration and judgment. The master mechanism is a basic component of the teleoperation system and the development of the useful one is important for efficiency of the work. A master mechanism of exoskeleton type can increase the work efficiency, mobility and harmony between a working robot and an operator. This paper describes an arm-harness of exoskeleton type, which is able to drive a robot according to judgment. This device is applied to a robot system for evaluating the system performance through the experiment.

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An Analysis on the Influence of Work Management Type on Work Condition (작업관리방식이 작업여건에 미치는 영향 분석 - 주단위작업관리방식과 일단위작업관리방식을 중심으로 -)

  • Yoon, Byong-Sik;Yu, Jung-Ho;Kim, Chang-Duk
    • Korean Journal of Construction Engineering and Management
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    • v.11 no.5
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    • pp.75-83
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    • 2010
  • Construction industries is a labor intensive industries. According to Korea Productivity Center, most OECD members indicate high labor productivity more than Korea labor productivity in construction industries. First of all, for increasing labor productivity work efficiency and work condition should be managed by administrator in work site. Especially, work condition could be controlled by the management behaviors of administrator in work site such as work management type. This indicates that work management type could influence strongly work condition. But although that work management type could influence work condition is the characteristic of construction work is recongized to many people, the quantitative analysis on the relationship between work condition and work management type is not enough. Therefore the purpose of this study is to analyze the Influence of Work Management Type on Work Condition.

An Exploratoy Study on Influence Factors for Expectation Effect of Smart Work and the Attitude Difference between Positions and Job Types (스마트워크의 기대효과 영향요인과 직급/직무 간 수용태도 차이 간 탐색연구)

  • Park, Kiho
    • Journal of Information Technology Applications and Management
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    • v.25 no.4
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    • pp.23-39
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    • 2018
  • The purpose of this study was to investigate empirically whether the expected effects of smart work in organizations were different between job types and positions. The development of information technology is demanding innovation of working style within the enterprise. There is a tendency to prefer the face-to-face working style in traditional organizations in the case of some positions or job types. However, many companies are carrying out smart work such as teleworking or telecommuting, flexible working time. But many companies still stick to their existing working methods. There is also the causal relationship between accepting attitudes toward smart work and expectation effects, depending on the position and the job types, even within the same organization. As a result of research, causal relationship analysis showed that the significant factors affecting productivity were teleworking and increasing work efficiency. The national social cost savings were influenced by the improvement of quality of life and flexible working hours. In order to activate communication within the organization, there was a positive effect on the increase of work efficiency. Only flexible working hours between the general manager and subordinates showed a significant difference.

The Problem and Improvement Solution Regarding the Inquiry of Sample (검체 문의에 관한 문제점 및 개선방안)

  • Yang, Joon-Ho;Seo, Jung-Mi;Song, Hoon-Gang;Kim, Eun-Jung;Kim, Chang-Ho
    • The Korean Journal of Nuclear Medicine Technology
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    • v.13 no.3
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    • pp.193-195
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    • 2009
  • Purpose: The work flow of international hospital's laboratory consists of rapid test and result report at the present day. However, the frequent inquiry of sample, which cause affairs to delay and efficiency to Lower, affects medical examination. In order to promote work's efficiency, we should improve the problem and make work smooth between a laboratory, outs and ward. Materials and Methods: This study runs as follows. First, Investigating test result, test schedule, test receipt, quick result, etc through the activity required from September to November 2007 about the inquiry of sample. After analysis of the problem in December, remaking the test schedule for improvement solution and reporting it to outs and ward. When the result is retest and dilution, we directly fill in a result space with the result situation of the patient to let them know beforehand. We also, prevent the omission of the result through checking the sample list and discriminate in vivo from in vitro by changing the laboratory's telephone number. We have improved the problem about the inquiry of sample through valuation and analysis since the improvement activity from January to March 2008. Result: The case about the frequent inquiry of sample has reduced by 57.8%. this improvement activity indicated that p-value<0.05 was statistically significant through paired t-test. This activity make study smooth and we rapidly report the result. Conclusion: By reducing the case regarding the inquiry of sample, work discontinuation, and concentration reduction, the work efficiency was increased.

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A Feasibility Study on Optimal Lifting Planning in the High-rise Apartment Building Construction (공동주택공사의 건설용 리프트를 이용한 양중계획 타당성 분석)

  • Lee, Jun-Bok;Han, Choong-Hee
    • Korean Journal of Construction Engineering and Management
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    • v.9 no.3
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    • pp.185-193
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    • 2008
  • In order to improve work efficiency in high-rise apartment building construction, it is required to establish the major criteria and practical method for selecting the construction lifts. It is necessary to analyze work efficiency and economic feasibility depending on speed, size and capacity of lifting equipment and characteristics of construction projects. The purpose of this research is to develop the fundamental process and information for selecting the lift in order to plan and manage the material lifting and laborers' vertical transporting in the high-rise apartment building projects more effectively. In order to satisfy the objective of the research, work performance of the lifting machines with different speed and carrying capacity is analyzed under the practical constraints. In addition, potential economic evaluation is conducted. One of the significant findings of the research is that the mid-speed lift shows 43% improvement in work efficiency compared with the low-speed lift. The results of the research will be used as the basis for developing the further optimal lifting management system.

Efficiency Analysis on Customs Clearance Service of Korea (한국의 통관서비스 효율성 분석에 관한 연구)

  • Lee, Ki-Woong
    • The Korean Research Institute of International Commerce and Law
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    • v.53
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    • pp.315-336
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    • 2012
  • In year 2011 export volume of South Korea surpassed 500billion USD and overall trade volume has exceeded one trillion USD. South Korea is ranked at 7th in the world by its export volume. Such an expansion of the trade volume leads to growth in customs clearance service demand. However, there are only handfuls of studies on the efficiency of customs clearance service which customs broker provide. If the efficiency in this study is not absolute, it shows relative efficiency to decision making unit. In this research survey was conducted targeting members of Korea Customs Brokers Association. Based on the survey improvement plans to enhance efficiency of customs clearances are as follows. First, rationalize the customs broker fee. Second, setup batch processing system to improve efficiency of the work process. Third, develop new area of task such as FTA and AEO certification. Forth, raise service quality by improving professionalism of customs brokers. Fifth, work efficiency of the office in the capital area will increase. Sixth, when inspecting import export cargo, customs broker should attend at the scene by their choice. Meanwhile, difference analysis on competent customs, type of office, and duration of the business was done but all the aspects were rejected. Such aspects does not influence on its effectiveness.

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Numerical Predictions of Roughness Effects on the Performance Degradation of an Axial-Turbine Stage

  • Kang Young-Seok;Yoo Jae-Chun;Kang Shin-Hyoung
    • Journal of Mechanical Science and Technology
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    • v.20 no.7
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    • pp.1077-1088
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    • 2006
  • This paper describes a numerical investigation on the performance deteriorations of a low speed, single-stage axial turbine due to use of rough blades. Numerical calculations have been carried out with a commercial CFD code, CFX-Tascflow, by using a modified wall function to implement rough surfaces on the stator vane and rotor blade. To assess the stage performance variations corresponding to 5 equivalent sand-grain roughness heights from a transition ally rough regime to a fully rough regime, stage work coefficient and total to static efficiency were chosen. Numerical results showed that both work coefficient and stage efficiency reduced as roughness height increased. Higher surface roughness induced higher blade loading both on the stator and rotor which in turn resulted in higher deviation angles and corresponding work coefficient reductions. Although, deviation angle changes were small, a simple sensitivity analysis suggested that their contributions on work coefficient reductions were substantial. Higher profile loss coefficients were predicted by higher roughness heights, especially on the suction surface of the stator and rotor. Furthermore sensitivity analysis similar to the above, suggested that additional profile loss generations due to roughness were accountable for efficiency reductions.

Development and Working Efficiency of Supporting Program for the Parametric Electrical Outfit Production Design of Offshore Plant Based on PML (PML 기반 파라메트릭 해양플랜트 전장생산설계 지원 프로그램 개발 및 업무 효율성 연구)

  • Kim, Hyun-Cheol;Kim, Jong-Myung
    • Journal of Ocean Engineering and Technology
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    • v.33 no.3
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    • pp.205-213
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    • 2019
  • Recently, because of the global recession of the offshore plant industry and low-cost orders, there has been increasing interest in strengthening the competitiveness of domestic companies for the design and production technologies of offshore plants. However, in the offshore plant design field, the Plant Design Management System (PDMS), which is a 3D CAD program for plant layout developed by AVEVA Marine, is already commonly used as offshore plant design software and widely used in large domestic shipyards and cooperative design companies. Under this background, we have been thinking about ways to design better with the existing software. In this study, we developed a parametric design program to maximize the efficiency and reduce the working time for offshore plant electrical outfit production design based on the Programmable Macro Language (PML) of PDMS. We also examined its performance. By applying the developed program to the offshore plant module selected as an application example, it was confirmed that a 50% improvement in the work efficiency of cable tray design could be obtained compared with the existing method, with work efficiency improvements of 80% or more in other field design work.

A Study on the Optimum Allocation Model for Inventory Capacity (재고설비규모를 위한 최적분배 모델의 연구)

  • 최진영;정기호
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.5 no.6
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    • pp.1-6
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    • 1982
  • The objective of this thesis to Provide a better insight into the effect of the amount of in-process storage has on the efficiency of production line with variable operation times. It is assumed that the material enters the line at the first work station and is then processed progressively through the line until it exits at the last work station, a finite amount of in-process storage is provided before all but the first work station of the line and the operation time of the work stations are statistically independent and follow exponential distribution. Under the above assumption, optimum allocation model is developed and following two approaches are used : 1) Given the available storage capacity, optimum allocation which minimizes the number of items in the line. 2) Given the available storage capacity, optimum allocation which. maximizes the utilization factor of the line. In a balanced three stage line, the production line efficiency is maximized under both categories when the second in-process storage is larger than the first.

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