• Transactions of the Korean Society of Automotive Engineers
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• v.23 no.4
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• pp.454-461
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• 2015

This study compares the results of a sled test and FEA(Finite Element Analysis) of a vehicle seatbelt system and aims to propose a method to efficiently reduce the error rate in the results of the FEA. This study evaluates the relative importance of potential causes, applying AHP(Analytic Hierarchy Process) technique in order to improve the reliability of the result of the FEA, and draw a highly reliable result of FEA, conducting a Taguchi Method and optimization for reducing the error rate in the FEA through the design of experiments.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.8
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• pp.450-456
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• 2003

This paper proposes a multiple time-series model with dummy variables for one-hour ahead load forecasting. We used 11 dummy variables that were classified by day characteristics such as day of the week, holiday, and special holiday. Also, model specification and selection of input variables including dummy variables were made by test statistics such as AIC(Akaike Information Criterion) and t-test statistics of each coefficient. OLS (Ordinary Least Squares) method was used for estimation and forecasting. We found out that model specifications for each hour are not identical usually at 30％ of optimal significance level, and dummy variables reduce the forecasting error if they are classified properly. The proposed model has much more accurate estimates in forecasting with less MAPE (Mean Absolute Percentage Error).

• English Language & Literature Teaching
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• v.9 no.1
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• pp.189-203
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• 2003

This paper attempts to prove Dickens's hopeful view of the future in his last completed novel Our Mutual Friend. This novel has been usually regarded as one of the "dark" novels, "dark" in the sense of viewing social reality and the future negatively. However, although it has the dark descriptive color of society typical in Dickens's later novels, it still contains some elements that point to a better future. To prove this positive view of future, this paper will disentangle the intricate narrative structure of Our Mutual Friend and find out the true meaning of the dust--money. In addition, it will investigate how people react to dust(-like money). From a close study of several characters' lives, it will testify that the dark world of Our Mutual Friend, in the end, could be a world of regeneration, a world that will lead to a better future.

• Journal of Auto-vehicle Safety Association
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• v.5 no.1
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• pp.31-36
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• 2013

For the robust passenger NCAP 5star and the stable neck injury performance, a new concept of passenger airbag has been required strongly. Especially, the deployment stability and the vent hole control technology of the passenger airbag should be improved. According to these requirements, the deployment stability technique has been studied and the 'Active Vent' technology has been developed. As a result, these technologies have led to achieve the robust NCAP rating and are applied to the production vehicles.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.97-100
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• 2018

세마포어 처리문제는 프로세스간 메시지를 전송하거나 공유메모리를 통해 특정 데이터를 공유할 때 발생되는 문제로 공유된 자원에 여러 개의 프로세스가 동시에 접근하면 안되며, 단지 한번에 하나의 프로세서만 접근 가능하도록 하여야 한다. 세마포어 기본정책은 호출되는 코어에 생성되며, 다른 코어에서는 IPI를 통해 존재 여부를 확인한다. 동일 코어에서 접근 시 기존방식으로 사용한다. 본 논문에서는 서로 다른 코어 및 운영체제에서 다른 코어에서 접근할 때에는 IPI를 통해 존재 여부를 확인한 후 더미 세마포어 구조체를 생성하여 관련 정보를 유지하고 해당 요청을 처리해 주는 세마포어 인터페이스 기능 설계 방법을 제안한다. 제안하는 세마포어 인터페이스 기능 설계 방안은 멀티 태스킹 기술 구현으로 기존 코어가 가지고 있는 성능상의 문제를 해결해 준다.

• Resources Recycling
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• v.20 no.4
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• pp.46-51
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• 2011

A study on the recovery of tin from the steel ball scraps for barrel plating has been carried out the physical treatment and leaching experiment. The recovery of iron component was over 95% by the physical treatment, and the recovery of tin component was also over 95% by the hydro process.

• Journal of the Korean Society of Mechanical Technology
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• v.13 no.3
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• pp.57-64
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• 2011

Vibrations on the floor in a car are transmitted to the foot, hip, and back from the seat. Human body recognizes these vibrations, but the sensitivity for each vibration is different. To evaluate these vibrations, RMS(root mean square) of accelerations, VDV(vibration does value) are commonly used. The ride comfort evaluation is usually carried out by experiments of real cars which are expensive. The purpose of this paper is to briefly review the status of several ride vibration standards and criteria having relevance to construction machinery vehicles and to suggest recommendations for the effective use of such criteria in vehicle / component development.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.209-211
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• 2021

위치를 이용한 애플리케이션이 증가함에 따라 사용자의 위치를 보호하기 위한 다양한 연구들이 진행되고 있다. 특히, 애플리케이션을 이용하기 위해서는 사용자가 서비스 제공자(서버)에게 자신의 위치 정보를 제공해야 하는 상황이다. 이러한 문제를 개선하기 위하여 보호영역(cloaking;클로킹)을 생성하거나 자신의 주변에 가상의 사용자(dummy;더미)를 생성하는 연구 등이 존재한다. 기존 연구들은 사용자의 현재 위치를 보호하는 장점은 있지만 연속적인 질의를 요청할 경우 서버에게 사용자의 이동 경로가 예측될 수 있다. 따라서 본 논문에서는 사용자가 연속적인 질의를 요청하더라도 이동 경로를 보호할 수 있는 기법을 제안한다. 실험 결과를 통하여 제안 기법의 우수성을 증명했다.

• Journal of Auto-vehicle Safety Association
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• v.15 no.4
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• pp.48-57
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• 2023

With the advance of autonomous vehicle technology various sitting posture is possible like relax position (inclined seating posture). Parametric study was done with MADYMO, a mutibody dynamics solver, to investigate the effect of sitting posture in different frontal crash modes, full frontal, 40% offset, and angled rigid barrier crash as well as various impact speeds. Hybrid III 50th male and 5th female dummies were used to figure out the difference induced by occupant weight and dimension. Restraint system parameters complying to current safety protocols like NCAP are studied if they still work effectively in relax position which is feasible with autonomous vehicles.

• Tunnel and Underground Space
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• v.18 no.6
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• pp.418-426
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• 2008

A surface blasting method with a single tree face is currently used in Pasir Coal Mine in Indonesia. The single free face is usually the ground surface. This kind of blasting method is easy to use but inevitably causes enormous ground vibrations, which, in turn, can affect the stability of the slopes comprising the various boundaries of the open pit mine. In this regard, we decided to make a specific blasting guideline for the control of found vibrations to ensure the safety of the pit slopes and waste dumps of the mine. Firstly, we derived a prediction equation for the ground vibration levels that could be occurred during blasting in the pits. Then, we set the allowable levels of ground vibrations for the pit slopes and waste dumps as peak particle velocities of 120mm/s and 60mm/s, respectively. From the prediction equation and allowable levels, safe scaled distances were established for field use. The blast design equations for the pit slopes and waste dumps were $D_s{\geq}5\;and\;D_S{\geq}10$ respectively. We also provide several standard blasting patterns for the hole depths of $3.3{sim}8.8m$.