• 대한수학회논문집
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• 제37권2호
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• pp.473-496
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• 2022

In 2014, Liu and Wang established a large number of interesting reduction, transformation and summation formulas for the Kampé de Fériet function. Inspired by the work, we aim to find further several transformation and reduction formulas for the Kampé de Fériet function. Theses formulas are mainly based on the formulas given by Liu and Wang [33].

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.483-486
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• 2006

건설 프로젝트에서 VE는 예산절감 및 품질을 향상시킬 수 있는 체계적인 방법이며 최근 건설VE 업무의 적용범위가 확대됨에 따라 그 중요성이 부각되고 있다. 따라서 VE 업무를 체계적이고 효율적으로 수행할 수 있는 방법에 관한 연구가 요구된다. 이에 본 연구에서는 현행 건설VE 업무 진행과정상의 문제점을 분석하여 업무 능률을 효율화할 수 있는 모델을 제안하였다. 제안 모델은 발주자 및 사용자의 요구항목을 체계적으로 반영하여 초기 VE 업무의 접근 방향 및 기준 설정을 가능하게 할 것이다. 따라서 후속적으로 진행되는 분석단계의 기능분석 및 아이디어 창출 업무의 효율성을 증대시켜 성공적인 VE 성과를 도출 가능하게 할 것이다.

• 대한산업공학회지
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• 제1권2호
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• pp.27-38
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• 1975

This paper explores a quantitative decision-making system for planning production, inventories and work-force in a multi-item production system. The Multi-item Parametric Decision Rule (MPDR) model, which assumes the existence of two types of linear feed-back rules, one for work-force level and one for production rates, is basically an extension of the existing method of Parametric Production Planning (PPP) proposed by C.H. Jones. The MPDR model, however, explicitly considers the effect of manufacturing progress and other factors such as employee turn-over, difference in work-days between month etc., and it also provides decision rules for production rates of individual items. First, the cost relations of the production system are estimated in terms of mathematical functions, and then decision rules for work-force level and production rates of individual items are establised based upon the estimated objective cost function. Finally, a direct search technique is used to find a set of parameters which minimizes the total cost of the objective function over a specified planning horizon, given estimates of future demands and initial values of inventories and work-force level. As a case problem, a hypothetical decision rule is developed for a particular firm (truck assembly factory).

• 한국보육지원학회지
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• 제9권2호
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• pp.97-115
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• 2013

본 연구에서는 Mihaly Csikszentmihalyi가 제시한 인지적, 정의적, 동기적 차원의 플로우 개념을 바탕으로, 어린이집 교사가 직업적 상황에서 경험하는 일 플로우를 측정하였다. 그리고 일 플로우가 어린이집교사의 역할갈등의 다양한 요인들과 어떠한 관계를 가지는지 분석해 보고자 하였다. 이를 위해 154명의 어린이집 교사들로부터 자료를 수집하였으며, 일 플로우 변수군(몰입, 즐거움, 내재적 동기)과 역할갈등 변수군(교사개인, 유아, 조직구성원, 학부모, 행정 및 업무지원, 장학, 사회적 인식) 간의 관계를 검증하고 각 개별변수들의 상호 영향력을 검증하기 위하여 정준상관분석을 실시하였다. 분석결과, 어린이집교사의 일 플로우와 역할갈등 변수군 간의 관계는 상호교호적인 한편, 일 플로우의 예측변수로서 역할갈등을 설정하는 인과관계모형의 가능성을 확인할 수 있었다. 그리고 어린이집교사의 일 플로우의 변수 중 몰입과 즐거움은 교사개인 및 장학관련 역할갈등과의 상호영향력이 높고, 즐거움은 행정 및 업무지원과 장학관련 역할갈등과의 상호영향력이 높음을 알 수 있었다. 연구결과를 바탕으로 관련 국내 외 연구와의 비교 및 이론적 논의점을 기술하였고, 어린이집교사의 개인적, 조직적 맥락의 다양한 변수를 고려한 플로우 연구의 필요성을 제안하였다.

• 한국정밀공학회지
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• 제27권1호
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• pp.76-83
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• 2010

There have been many studies regarding development of autonomous excavation system which is helpful in construction sites where repetitive jobs are necessary. Unfortunately, bucket trajectory planning was excluded from the previous studies. Since, the best use of excavator is to dig efficiently; purpose of this research was set to determine an optimized bucket trajectory in order to get best digging performance. Among infinite ways of digging any given path, criterion for either optimal or efficient bucket moves is required to be established. One method is to adopt work know-how from experienced excavator operator; However the work pattern varies from every worker to worker and it is hard to be analyzed. Thus, other than the work pattern taken from experienced operator, we developed an efficiency model to solve this problem. This paper presents a method to derive a bucket trajectory from optimization theory with empirical CLUB soil model. Path is greatly influenced by physical constraints such as geometry, excavator dimension and excavator workspace. By minimizing a energy function under these constraints, an optimal bucket trajectory could be obtained.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.525-528
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• 2004

The ion-induced secondary electron emission coefficient ${\gamma}$ and work function for MgO thin film with $O_2$ plasma treatment has been investigated by ${\gamma}$ -FIB (focused ion beam) system. The MgO thin film deposited from sintered material with $O_2$ plasma treatment is found to have higher ${\gamma}$ and lower work function than those without $O_2$ plasma treatment. The energy of various ions used has been ranged from 100eV to 200eV throughout this experiment. It is found that the highest secondary electron emission coefficient ${\gamma}$ has been achieved for 10 minutes of $O_2$ plasma treatment under RF power of 50W.

• 복식문화연구
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• 제4권3호
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• pp.337-347
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• 1996

The work-man's Uniform should be coincident with the image of his firm and accounted of the function according s its purpose. We made questions to 404 workers at 8firm in our country through the questionnaire papers to know about a work-man's uniform and researched whether the satisfactory in wearing his uniform had relation with his type of business, grade, carrier, age, marriage, and monthly income. The results of this study is as follows; 1. In the case of wearing the uniform many workers answered they always wore their uniform in the firm. It was shown that the office workers wore their uniform much more than workers in the production department. The longer the time working, the older age, the lower grade of school career are, he more workers wear. the order of the importance for he uniform was the function, the symbol, the originality, and the fashion. The longer their career in the firm was, the more important the function of their uniform was. 2. The order of dirty pat in taking care of the uniform was cuffs, color, the front of part in an upper garment and below the knee, the hip in pants It was very easy for the workers in the experts, or administrators and office workers than others to be dirty in the cuffs part of the uniform. Worn part of the uniform showed highest cuffs in an upper garment and a zipper in pants. The order of cleaning the uniform was washing by water, no ironing, and cleaning in their house.

• Transactions on Electrical and Electronic Materials
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• 제14권5호
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• pp.242-245
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• 2013

Sn-doped $In_2O_3$ (ITO) thin films were prepared by radio frequency magnetron sputtering without intentional substrate heating on bare glass and $TiO_2$-deposited glass substrates to investigate the effect of a $TiO_2$ buffer layer on the electrical and optical properties of ITO films. The thicknesses of $TiO_2$ and ITO films were kept constant at 5 and 100 nm, respectively. As-deposited ITO single layer films show an optical transmittance of 75.9%, while $ITO/TiO_2$ bi-layered films show a lower transmittance of 76.1%. However, as-deposited $ITO/TiO_2$ films show a lower resistivity ($9.87{\times}10^{-4}{\Omega}cm$) than that of ITO single layer films. In addition, the work function of the ITO film is affected by the $TiO_2$ buffer layer, with the $ITO/TiO_2$ films having a higher work-function (5.0 eV) than that of the ITO single layer films. The experimental results indicate that a 5-nm-thick $TiO_2$ buffer layer on the $ITO/TiO_2$ films results in better performance than conventional ITO single layer films.

• 한국통신학회논문지
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• 제42권2호
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• pp.331-337
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• 2017

본 논문에서는 암호화된 이미지에서 Zhang의 가역적 데이터 은닉 기법을 개선하는 알고리즘을 제안한다. 기존의 기법에서는 주변 픽셀의 평균값이 섭동함수로 사용되었고 모의실험 시 오류 성능이 저하됨을 확인되었다. 제안하는 시스템에서는 비트 오류율을 줄이고자 섭동을 측정 할 때 주변 함수와의 차이의 합을 더하여 계산한다. 또한 경계 픽셀을 고려한 변동함수의 새로운 계산법을 제안한다. Zhang과 Hong의 시스템과 비교 시 제안 기법의 성능이 우수함을 모의실험을 통해 확인할 수 있다. 이 결과로부터 제안 시스템을 사용할 경우 오류 없이 정보를 더 전송할 수 있음을 확인할 수 있다.

• 한국전기전자재료학회논문지
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• 제25권9호
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• pp.671-676
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• 2012

In this paper, TCAD assessment of 30-V class n-channel EDMOS (extended drain metal-oxide-semiconductor) transistors with DWFG (dual work function gate) structure are described. Gate of the DWFG EDMOS transistor is composed of both p- and n-type doped region on source and drain side. Additionally, lengths of p- and n-type doped gate region are varied while keeping physical channel length. Two-dimensional device structures are generated trough TSUPREM-4 and their electrical characteristics are investigated with MEDICI. The DWFG EDMOS transistor shows improved electrical characteristics than conventional device - i.e. higher transconductance ($g_m$), better drain output current ($I_{ON}$), reduced specific on-resistances ($R_{ON}$) and higher breakdown characteristics ($BV_{DSS}$).