• Proceedings of the KSR Conference
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• 1998.11a
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• pp.497-504
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• 1998

The manufacturing processes of the head hardened rails and the principles of the heat treatment for carbon steels are introduced in this paper, To get the good wear resistance of the rail, many kinds of microstructure had been developed for the rail head hardening. One of these is the tempered martensitic structure, which is very hard but brittle because of Quenching-Tempering Process. Another is the fine pearlitic structure by Slack Quenching. Now Banitic structure steels are emerging as a potential new material to replace eutectoid pearlitic steels for rail. The main reason of this change is due to the limitaion of pearlitic microstructure with regard to mechanical properties and wear resistances of railway rails.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.65-66
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• 2020

이 논문에서는 NTFS 파일시스템에서 여러 개의 클러스터에 걸쳐서 슬랙 영역에 데이터 숨기기를 수행하는 데이터 숨기기 방법의 강인성을 조사하기 위하여 디스크 조각모음 실험을 수행할 때 필요한 방법을 제안한다. 디스크 조각모음의 실행으로 클러스터의 위치가 변동되기 위해서는 여러 클러스터에 걸친 디스크 조각의 단편화가 일어날 수 있도록 파일을 생성하고 삭제하는 작업을 수행한다. 그 후에 용량이 큰 파일을 복사하여 여러 클러스터에 걸친 단편화된 파일을 작위적으로 생성한다. 단편화된 파일만을 남기고 그 이외의 다른 파일들을 삭제한 후에 디스크조각 모음을 수행한다. 이 실험에 필요한 준비과정과 실험과정을 제안한다.

• Annual Conference of KIPS
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• 2021.11a
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• pp.402-404
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• 2021

최근 인공지능 기술이 발전하면서, 일상에서 인공지능 기반 챗봇을 어렵지 않게 접할 수 있다. 챗봇 기술이 발전하면서, 챗봇을 구현하기 위한 다양한 챗봇 프레임워크가 등장하였다. Google 의 Dialogflow 는 최소한의 코딩으로 챗봇을 설계하고, 생성하기 위한 오픈소스 챗봇 프레임워크로 Facebook Messenger, Telegram, Slack 등 여러 메신저 플랫폼과 연동이 된다. 본 논문은 Dialogflow 를 이용한 프로토타입 챗봇 구현을 통하여 Dialogflow 의 특징인 Dialog(대화)의 Flow(흐름)를 만들기만 하면 이를 통해 챗봇을 만들어 지는 용이성 검증을 시행하였다.

• 한국벤처창업학회:학술대회논문집
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• 2021.11a
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• pp.179-183
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• 2021

창업기업의 성과는 창업가 개인의 역량 뿐 만 아니라 네트워크 등 기업가 정신이 발현되는 모든 영역의 요소들이 작용한다. 재무적 자원에서부터 기업의 기능별 역량과 자원에 이르기까지 충분하지 않은 창업기업들은 전략적으로 기업이나 대학과 같은 외부 주체들과의 제휴를 추진하여 성과향상을 의도할 수 있다. 전략적 제휴와 기업 성과 간의 관계는 전략경영분야에서 오랫동안 다루어져 온 연구 주제였다. 다만, 창업기업이라는 한정된 역량과 자원 상황에서 창업 기업이 실제로 이러한 전략적 제휴를 통해 재무성과를 향상시키는지에 대한 연구는 미흡하였다. 이에 본 연구는 창업기업의 전략적 제휴가 재무성과에 미치는 영향을 규명하고 그러한 관계에 영향을 미칠 수 있는 혁신역량 강화활동으로서 R&D투자와 교육훈련 투자의 영향을 분석하고자 한다. 또한, 창업기업이 보유한 인적 여유자원(slack resource)의 역할도 함께 규명하여 창업기업의 전략적 제휴와 관련한 행동적 특성을 논의하고자 한다. 이를 통해 본 연구는 기업이 전략적 제휴를 통해 보다 나은 성과향상을 위한 투자로서 다양한 혁신역량 강화활동 필요성에 대한 시사점을 제시할 것으로 기대한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.11a
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• pp.105-106
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• 2023

In project projects where various factors arise, the construction company's initial establishment of a reasonable process plan reduces various variables and potential risks. In order to create a densely written initial process plan, it is necessary to compare the economic feasibility of time and money by reflecting Slack time. Through this, site managers can lead a successful project based on reasonable and stable construction.

• KDI Journal of Economic Policy
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• v.46 no.3
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• pp.67-91
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• 2024

This paper aims to examine the economic impact of the implementation of an unemployment insurance (UI) program for entrepreneurs in South Korea. Despite facing labor market risks similar to paid employees, entrepreneurs are often not eligible for UI in many countries. South Korea, where entrepreneurs represent over 20% of the workforce, is considering a design of UI for entrepreneurs, with the goal of providing coverage to this group by 2025. This study examines how the addition of UI for entrepreneurs would impact the economy using a model of entrepreneurship based on a search and matching framework. The study's findings suggest that the implementation of UI for entrepreneurs would lead to increased business closures and reduced hiring, resulting in a slack labor market, which in turn would reduce social welfare overall. However, social welfare can be improved by subsidizing UI contributions paid by entrepreneurs, which provides the greatest improvement in social welfare compared to other social protection systems such as unemployment assistance.

• Journal of agricultural medicine and community health
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• v.23 no.2
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• pp.305-310
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• 1998

The usage or agricultural chemicals is on the increasing tendency. Methyl bromide and organophosphate are the most widely used toxic agricultural chemicals in Korea. We try to set up the methods to detect the accumulation of these chemicals in Korean farmers. Blood samples were collected for 121 farmers of slack's season in February 1998. And survey about arable acreage and usage of the gloves and masks was also performed. Serum cholinesterase activities and bromide concentrations were measured with gold chloride method and colorimetric method. The reference ranges of serum cholinesterase activity and bromide concentration were 1.6~15.9 U/mL and below $72.9{\mu}g/mL$. Serum bromide concentrations of farmers and normal controls showed no differences. Serum cholinesterase activities of farmers were significantly higher than those of normal controls. According to the arable acreages and usage of the gloves and masks, serum bromide concentrations and cholinesterase activities showed no differences. In conclusion, serum cholinesterase activities and bromide concentrations showed no differences between farmers of slack's season and normal controls.

• Korean Journal of Environmental Biology
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• v.35 no.3
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• pp.380-388
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• 2017

Factors affecting spatial distribution of halophytes were analyzed in June 2012 at the Goraebul coastal dunes. In the Goraebul sand dune, distribution of halophytes was divided into three groups. The first group belonging to Elymus mollis, Carex kobomugi, Calystegia soldanella, Ixeris repens and Glehnia littoralis was distributed in the ridge of primary sand dune and dune slack. The second group belonging to Lathyrus japonicus and Zoysia macrostachya was distributed in the dune slack. The third group belonging to Pinus thunbergii, Vitex rotundifolia and Linaria japonicus was distributed in the pine forest of the secondary sand dune. E. mollis, C. kobomugi, C. soldanella, I. repens and G. littoralis was distributed in relatively unstable habitat of sand dunes due to the large amount of sand movement. V. rotundifolia was distributed in a relatively stable habitat. Factors that have the greatest influence on distribution of halophytes in the Goraebul sand dunes are distance from the seashore, topography, and the pine forest. The Goraebul sand dune is a relatively well-preserved area with minimal human intervention. Therefore, different distribution of physico-chemical factors by natural processes is essential to spatial distribution of halophytes than other sand dunes in Korea. Significant natural processes in the Goraebul sand dunes were advance and retreat of coastlines from waves, erosion and sedimentation of sand due to wind and waves, and dispersal of seawater.

• Journal of the Korean Society of Clothing and Textiles
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• v.15 no.2 s.38
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• pp.199-209
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• 1991

In this paper, the fabrics for Korean folk clothes(KFC) undergoes repeated laundering under given condition. After this cyclic laundering was applied, the mechanical properties of the specimen were measured using KES-F system in order to evaluated the end-use performance of fabrics for KFC. And also, the crease recovery of fabrics for KFC were measured by shirley crease recovery tester. 78 different kinds of commercial silk fabrics and polyester fabrics for KFC were used for this study. The experimental results were analysed statistically to relate the mechanical properties and the crease recovery of fabrics for KFC. Furthermore, these changes in dimensional stability, mechanical properties and handle of fabrics for KFC were discussed in comparison with those values for silk fabrics and polyester fabrics. The results obtained are as follows. 1. Regardless of materials, remarkable increase are observed in shrinkage of the fabrics for KFC about repeated laundering, but dull increase are observed in shrinkage after 10 cycles of the repeated laundering. On the other hand, slack extend are observed in dimensions after 20 cycles of the repeated laundering. The shrinkage of fabrics for KFC after 10 cycles of the lundering showed that the silk fabrics are $1.74{\pm}0.33\%$ (warp direction) and $1.35{\pm}0.23\%$ (weft direction) and the polyester fabrics are $1.45{\pm}0.22\%$ (warp direction) and $1.25{\pm}0.23\%$ (weft direction). 2. Except for tensile property, these changes in mechanical properties of fabrics for KFC by laundering have $\pm$ 16 range of bending, shearing, compression, surface, thickness & weight as compared with before laundering. Particularly, the LT and RT about $1\~3$ cycles of the repeated laundering showed remarkable decrease. And SMD, WC, T & W of fabrics for KFC by the laundering were more increased than one for original fabrics. But B, 2HB, G, 2HG, 2HGS were decreased more than one for original fabrics. 3. 'Stiffness', 'Anti-drape', 'Crispness' and 'Scroop' hand values decrease and'Fullness & softness', 'Flexibility & softness' hand values increase with repeated laundering. 4. Remarkable decrease are observed in crease recoveries about $1\~5$ cycles of the repeated lundering, but slack decrease are observed in crease recoveries after 5 cycles of repeated laundering. The crease recovery of fabrics for KFC have negative(-) correlation with LT, RT, G, RC and MMD, This fact implies that the smaller these values, the larger the crease recovery. The crease recovery of fabrics for KFC has a high degree of correlation with the mechanical properties such as shearing, compression, surface property. And also, the crease recovery are expected by measuring the mechanical properties such as G, 2HG, 2HGS, RC, WC, LC, MIU, MMD and SMD, according to the obtained regression equation.

• Korean Journal of Social Welfare Studies
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• v.47 no.1
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• pp.205-232
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• 2016

The purpose of this study is to analyze the bilateral and autoregressive relationships of corporate social performance and corporate financial performance by using dynamic panel model based on fixed effect analysis method. To satisfy this study purpose, 6 years data (2008-2013) of top 1,000 corporations in Korea was collected and finally 430 corporations were used for dynamic panel analysis. The main results were as follows. First, the preceding financial performance explains the following corporate social performance in positive direction. Second, the preceding corporate social performance does not explain the following financial performance. Third, the preceding corporate social performance explains the following corporate social performance in positive direction. Fourth, the preceding financial performance explains the following financial performance in positive direction. This result shows that slack resources theory is supported and good management theory is not supported. In addition, there is a significant relationship between the preceding corporate social performance and the following corporate social performance. Lastly, this study broadens and deepens previous understanding on corporate social philanthropy and discusses theoretical meanings and implications for future study.