• 가족자원경영과 정책
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• 제23권2호
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• pp.79-97
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• 2019

This study aimed for in-depth observation of the status quo of the youth generation's happiness utilizing the Better Life Index and the World Value Survey. To serve this purpose, the study selected 11 of the Organization for Economic Cooperation and Development(OECD) member countries (Australia, Estonia, Germany, Japan, Korea, Mexico, New Zealand, Poland, Sweden, Turkey, United States) that overlapped with the subject countries of the World Value Survey. The results of the observation first revealed that among the work-life balance levels of youth generations from across the 11 studied countries, the level for Korean youth was in a very poor state. Second, the happiness level of Korean youth also sat among the bottom ranks, with the aspects of politics, friendship, and career casting a heavy influence on importance to life; specifically, the youth generations of Turkey and Germany showed high levels of life purpose, while Korean youth displayed outstanding results in the challenge aspect. The third finding of this study reported that family, religion, power, benevolence, and challenge were commonly related to the happiness level of youth generations in countries with a higher work-life balance. The results of this study are expected to contribute to the much needed attention and support for improving the happiness level of the Korean youth generation, who will eventually play the leading role in our future society.

• 경영과학
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• 제12권1호
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• pp.61-77
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• 1995

The Ergonomic Workload Stress Index (EWSI) was developed to predict the existence and level of the ergonomic workload stress in the workplace. To determine the validity of model, the values of the EWSI and two other similar techniques, Job Severity Index (JSI) and Physical Work Stress Index (PWSI) were evaluated in two actual industrial environments. The results from the validation study provide further substantial evidence that two techniques, JSI and PWSI, which have similar objective considerations, are significantly associated with the value of the EWSI among the employees participating in the experimentation.

• Journal of applied mathematics & informatics
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• 제39권3_4호
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• pp.339-358
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• 2021

Zagreb indices and their modified versions of a molecular graph are important descriptors which can be used to characterize the structural properties of organic molecules from different aspects. In this work, we investigate some properties of the modified second multiplicative Zagreb index of graphs with given connectivity. In particular, we obtain the maximum values of the modified second multiplicative Zagreb index with fixed number of cut edges, or cut vertices, or edge connectivity, or vertex connectivity of graphs. Furthermore, we characterize the corresponding extremal graphs.

• 한국정보전자통신기술학회논문지
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• 제8권4호
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• pp.327-337
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• 2015

이 논문에서는 윈도우즈 NTFS 파일시스템에서 디렉토리의 인덱스에 메시지를 숨기기 위한 새로운 안티 포렌식 방법을 제안한다. 인덱스 엔트리 관리를 위하여 채택하고 있는 B-tree 구조의 특징을 이용하여 인덱스 레코드의 슬랙 영역에 숨길 메시지를 저장한다. 안티포렌식을 위해 숨길 메시지가 노출되지 않게 하기 위해 서 위장 파일을 사용하여 삭제된 파일이름의 정보가 MFT 엔트리에 남지 않도록 한다. 이 기법의 핵심 아이디어 의 이해하기 위해서 B-tree방식의 인덱스 레코드의 운영방법을 소개하고 이 연구에서 제안된 알고리즘을 설명 한다. 제작된 소프트웨어를 사용한 메시지를 숨긴 사례를 들어서 이 방법이 실질적인 기법이라는 것을 보인다.

• 한국건축시공학회지
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• 제14권2호
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• pp.150-155
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• 2014

건축공사 현장에서 공사관리를 수행하는 현장관리자의 작업능력은 프로젝트의 성공여부에 많은 영향을 미친다. 따라서 본 연구는 국내 건축공사 현장관리자의 작업능력에 영향을 미치는 요인을 파악하는 것을 연구의 목적으로 한다. 작업능력은 작업능력지수를 통해서 측정하였으며, 직무스트레스는 한국형 직무스트레스 측정도구를 통해서 측정하였다. 현장관리자의 작업능력은 직무스트레스가 높을수록 떨어지는 것으로 나타났다. 또한 운동, 종교보유도 현장관리자의 직무능력에 긍정적 영향을 주는 것으로 나타났다. 본 연구결과는 현장관리자의 작업능력을 향상시키는데 도움을 줄 수 있을 것으로 기대된다.

• 한국직업건강간호학회지
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• 제14권2호
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• pp.93-107
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• 2005

Purpose: The purpose of this study is to identify the trends of studies on work-related musculoskeletal disorder and to suggest the direction of future research. Method: 144 research thesis for a degree on work-related musculoskeletal disorder were systematic reviewed and published from Jan. 1990 to Mar. 2005. The analyzed using descriptive statistics, an actual number, percentage. Result: As its result the work-related musculoskeletal disorder research which is announced from domestic the doctorate dissertation at the 2004 year 42 the most many 144 dissertation middle most to be 129 in master degree dissertation was 15 in Ph D degree. Dissertation contents character the contents against the result relation that it analyzes especially and a condition and an obstacle was many most at 84. Research plan in most description investigation research 121 the dissertation field to be the especially public health (hygiene, industry and environment) at this 57 most many research object person distribution manufacturing industry in the research object one dissertation was many most at the 40. The tools which are used in each measurement in the question tool which it uses most the question price of land which uses the condition investigation ticket which it made from the NIOSH and the ANSI most many 33, the hazard which analyzes a work attitude in the tool which it uses the RULA was many most at 14. In the stress test tool social psychological healthy measurement PWI (Psychological Wellbeing Index) the dissertation which uses the Job Strain of the Karasek Model to be many most at 19 PWI (Psychological Wellbeing Index) 7 easy use. Work-related musculoskeletal disorder measurement hazard in physiological index and the machinery and tools which it uses there were 9 researches to use an electromyogram most plentifully. With the effect goes to a work-related musculoskeletal disorder they are 33 where the age is many most from general quality. From healthy act with the relation of smoking the year to be many from 16 dissertations. Work of the corpse an attitude (the attitude which is inappropriate) with 5 and the work market the work burglar is many most at 9, the society-support of 36 where the stress is many psychologically most, the stress and service also the most many duty discretion (authority and autonomy) is 6 at the duty demand boat song 9. The service career to be many is 22 of extraordinarily with relation of service. Conclusion: It is recommended the research which it sees being limited in only domestic thesis for a degree the international comparative study to become accomplished. It comes to think with the fact that it will be necessary to make the protocol which it conforms in the civil official guide the test researches for the protocol or arbitration program which is standardized are necessary. Prevention and the civil official of work relation bones and sinews standing total disease hazard scientific base one program is necessary with base.

• 한국ITS학회 논문지
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• 제16권6호
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• pp.124-140
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• 2017

공사구간으로 진입하는 운전자에게 안전한 회피행동을 유도하는 공사장 안내 및 경고정보가 제공되고 있다. 그러나 이동공사구간의 경우 작업차량 후방에 작업보호차량을 배치하여 운영하고 있지만 안전한 회피행동을 유도하기에는 한계가 있다. 본 연구에서는 이동공사구간에서 운전자의 주행행태분석을 통하여 안전성을 평가하고 능동적인 사고예방대책 방안을 제시하고자 하였다. 주행 시뮬레이션 실험을 통해 이동공사와 고정공사 구간에 대한 주행실험 시나리오를 제작하고 운전자의 주행궤적자료 수집하였다. 차로변경 시 종점, 차로변경 수행거리를 도출하여 주행특성분석 자료로 활용하였다. 또한 피실험자가 전방의 이동작업차량을 회피할 때의 주행궤적자료를 수집하여 주행안전성 평가지표인 Safety Distance Index를 산출하였다. 그 결과, 이동공사가 고정공사보다 위험한 주행행태를 나타냈다. 특히 주행차량은 저속으로 이동하는 작업차량을 사전에 인지하지 못하여 차로변경 시점이 늦게 나타나는 것을 확인하였다. 따라서 이동공사 시 운전자가 작업보호차량을 사전에 신속히 인지하고 적절한 회피행동을 수행할 수 있도록 경고정보를 제공하는 교통안전 향상 방안의 적극적인 도입이 필요하다.

• 한국전산유체공학회지
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• 제15권1호
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• pp.56-63
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• 2010

Since emission regulations for vehicles have become more stringent, SCR technology has drawn a strong attention in order to reduce NOx emissions. Optimal design of a reductant injection nozzle and a multi-hole plate located between the cone and catalyst is critical in that the uniform distribution of reductant is necessary to maximize the NOx conversion efficiency and minimize the slip of reductant in SCR. In this work, an LPG fuel(C3H8 in vapor state) was used as a reductant for LPG vehicles. A Realizable k-$\varepsilon$ model is used for turbulence, and SCR body is defined as porous media with inertia and viscous resistances measured in this work. Effect of the number of nozzle holes on the flow mixing index was analyzed, which revealed that a four hole nozzle shows the best performance in terms of uniformity of flow. An installment of a multi-hole plate at the entrance of catalyst was evaluated with flow mixing index, uniformity of flow, and pressure drop. A multi-hole plate with gradual hole diameter change in three steps showed the best uniformity of flow within the conditions suggested in this work.

• Corrosion Science and Technology
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• 제2권6호
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• pp.266-271
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• 2003

Safety diagnosis of various structural components and facilities is indispensable for preventing catastrophic failure of material by time-dependent and environment accelerating degradation. Also, this diagnosis of operating components should be done periodically for safe maintenance and economical repair. However, conventional standard methods for mechanical properties have the problems of bulky specimen, destructive procedure and complex procedure of specimen sampling. So, a non-destructive and simple mechanical testing method using small specimen is needed. Therefore, an advanced indentation technique was developed as a potential method for non-destructive testing of in-field structures. This technique measures indentation load-depth curve during indentation and analyzes the mechanical properties related to deformation such as yield strength, tensile strength and work-hardening index. In this paper, we characterized the tensile properties including yield and tensile strengths of the V-modified Cr-Mo steels in petro-chemical and thermo-electrical plants. And also, the effects of hydrogen-assisted degradation of the V-modified Cr-Mo steels were analyzed in terms of work-hardening index and yield ratio.

• The Journal of Korean Physical Therapy
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• 제14권2호
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• pp.172-180
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• 2002

The purpose of this paper was to make an analysis of anaerobic power in professional female basketball players using the Wingate Test Method with bicycle ergometer. Twenty-three subjects(age $21.6\pm2.8years$, body height $178.0\pm7.4cm$, body weight $70.3\pm7.4kg$) were selected from professional female basketball team whose careers were over 10years and participated in this investigation. Each subject peformed a Wingate anaerobic power test to determine total work, peak power, mean power, fatigue index and blood lactate concentration. The following were obtained from result data analysis; 1. The Total Work of athletes was a $1128.7\pm120.6watt$ 2. The Peak Power of athletes was a $449.5\pm53.1watt$ 3. The Mean Power of athletes was a $369.1\pm39.4watt$ 4. The Fatigue Index of athletes was a $33.5\pm6.9\%$ 5. The blood lactate concentration was $1.85\pm0.85mM/L$ at the normal state and $3.16\pm1.53mM/L$ at the after Wingate test. The blood lactate concentration was $6.96\pm0.81mM/L$ after 3 minute and $6.95\pm1.05mM/L$ after 5 minutes.