[임창식 서울시 노원구 주민자치협의회 신임 회장] “주민자치위원회 위상 정립에 최선을 다하겠다”

임창식 한국자치학회 2016 월간 주민자치 Vol.51 No.-

서보건을 이용한 알루미늄 합금의 저항 점용접

임창식,장희석 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.4

Conventional method for electrode force application in resistance spot welding(RSW) processes is to use pneumatic cylinder. However, due to its inherent problems in pneumatic power system such as compressibility of air and poor transient response characteristics, new electrode force system with servo control are recently introduced in RSW machine. This machine is called “servogun”. The purpose of this study is to evaluate performance of servogun in case of spot welding of aluminum alloy. Aluminum alloy(A5052) sheets are spot welded using pneumatic gun and servogun. Both results are compared by means of macro cross-section etching test and tensile shear strength test. Numerous previous research have reported nugget with many voids and cracks are not uncommon defects in spot welds with aluminum alloy. The experimental results show similar defects in case of pneumatic gun. In contrast, use of servogun considerably reduced generation of voids and cracks. In case of step-wise increased forging force at the end of welding cycle with servogun, crack-free and void-free nuggets have been observed. The performance of servogun has been also verified by series of tensile shear test. Higher strength values have been achieved with servogun in comparison to that of pneumatic gun.

보행자 통행안전성을 고려한 회전교차로의 고원식횡단보도 설치기준 연구

임창식,최양원 대한토목학회 2016 대한토목학회논문집 Vol.36 No.6

In order to calculate the optimum installation interval between a speed hump and hump type crosswalk that are installed continuously in succession, this study examined the speed of a vehicle that passes different intervals between speed humps and hump type crosswalks from the approach section of a roundabout having a maximum speed limit of 30km/h; analyzed the effects of speed humps and hump type crosswalks installed continuously in succession on vehicle driving speed; and simulated the optimum installation height of hump type crosswalk. As a result, the following conclusion was drawn. First, it was found that the optimum interval between a speed humpand hump type crosswalk, which are the representative traffic calming techniques for reducing vehicle speed, to control vehicle speed under 30km/h is 30m. Second, as a result of comparing the deceleration of a vehicle that pass hump type crosswalks, it was found that if the installation interval is 65 m and above, a speed hump and hump type crosswalk had no effect. Therefore, it is desirable that the maximum installation interval between a speed hump and hump type crosswalk for controlling vehicle speed within a fixed road section should not exceed 65m. Third, the analysis showed that the optimum installation height of hump type crosswalk is 6-8cm in case vehicle speed at the approach section is 20km/h or lower, 8-10cm in case of 30km/h, and 10cm in case of 30km/h or higher, respectively. Fourth, even at a road section on which a speed hump and hump type crosswalk are installed, speed reduction effects may sometimes be insignificant due to a driver's studying effect, traffic conditions and so on. Thus, it is judged that speed reduction effects will be greater if several traffic calming techniques such as speed hump, chicane, and choker are applied at the same time. Therefore, in case of applyingtraffic calming techniques for the purpose of reducing vehicle speed in order to promote pedestrian safety, the composite application of several techniques should be considered. 본 연구에서는 과속방지턱과 연속으로 설치된 고원식횡단보도의 적정 설치간격을 산정하기 위하여 최고속도제한이 30km/h로 운영되는 회전교차로의 접근부에서 과속방지턱과 고원식횡단보도 간 서로 다른 간격을 통과하는 차량의 속도를 조사하여 연속으로 설치된 과속방지턱과 고원식횡단보도가 차량의 주행속도에 미치는 영향을 분석하였고, 고원식횡단보도의 적정 설치높이에 대한 시뮬레이션에 다음과 같은 결론을 도출하였다. 첫째, 과속방지턱과 고원식횡단보도는 차량의 속도를 저감시키는 대표적인 교통정온화 기법으로 차량의 속도를 30km/h 이하로 제어하기 위한 과속방지턱과 고원식횡단보도의 적정 간격은 30m로 나타났다. 둘째, 고원식횡단보도를 통과하는 차량의 감속도를 비교한 결과 설치 간격이 65m 이상인 경우 과속방지턱과 고원식횡단보도의 효과가 없는 것으로 나타났다. 따라서 일정 구간의 차량 속도를 제어하기 위한 과속방지 턱과 고원식횡단보도의 최대설치 간격은 65m 이내로 설치하는 것이 바람직하다. 셋째, 고원식횡단보도의 설치높이는 차량의 접근부 속도가20km/h 이하일 때 6~8cm, 30km/h일 때 8~10cm, 30km/h 이상일 때 10cm의 설치가 가장 적정한 것으로 분석되었다. 넷째, 과속방지턱과 고원식횡단보도가 설치된 구간이어도 운전자의 학습효과, 교통상황 등에 의하여 속도감소 효과가 미미한 경우가 있으므로 과속방지턱, 시케인, 초커 등 여러 가지 교통정온화 기법을 동시에 적용할 경우 속도감소 효과가 더 클 것이라 판단된다. 따라서 보행자의 안전을 도모하기 위하여 차량의 속도를 저감시킬 목적으로 교통정온화 기법을 적용하는 경우 여러 가지 기법의 복합 적용을 고려하여야 할 것이다.

지능형 수세식 변기 배수장치의 개발

임창식,장희석 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract : It is designed to upgrade conventional toilet flushing unit. The new upgraded functions are automatic flushing and added safety features. By judging one's evacuation, volume of flushing water can be controlled with simple mechatronics device. Thus we can save considerable amount of water(4 liters per one operation). Futhermore, for those who are old, single, and handicapped, intelligent logic can detect emergency situation in the toilet. Thus logic triggers Home Security System and make and emergency call to prevent unexpected accidents that can happen around flushing unit.

북한 언론매체와 무역자료 분석을 통한 남북 농업협력 유망분야 및 품목 발굴

임창식,김미화,임정빈 건국대학교 인문학연구원 2022 통일인문학 Vol.92 No.-

북한은 과거부터 지속적으로 식량부족 문제를 겪어왔다. 이에 우리나라는 북한의 안정적인 식량수급을 위해 인도적 지원을 포함한 남북 농업협력 사업을 진행해왔다. 현재는 남북관계의 경색으로 인해 농업협력 사업이 중단된 상황이지만 남북관계의 개선 시 재개될 가능성이 높은 분야이다. 향후 재개될 남북 농업협력 사업의 성공가능성과 북한의 수용성을 높이기 위해서는 협력 수요자인 북한의 상황과 요구에 부합하는 농업협력 유망분야의 도출이 실증적 자료를 바탕으로 선행되어야 할 것이다. 본 연구에서는 먼저 북한의 언론매체 자료를 활용하여 북한의 농업실태 및 시장상황을 추정하는 것에 대한 타당성을 확보하고자 하였으며, 토픽모델링을 통하여 남북 농업협력 유망 분야를 발굴하였다. 추가적으로 무역경쟁력 분석을 통해 구체적인 남북 농업협력 유망 품목을 선정하였다. 분석 결과에 따르면 북한의 긍정적 농업기사의 출현은 쌀 시장가격의 하락과 유의한 인과관계가 존재하는 것으로 나타나, 북한의 언론매체를 활용하여 북한의 농업 및 시장상황을 파악하는 것은 타당한 것으로 판단된다. 이에 북한의 농업분야 언론매체 보도에 대한 토픽모델링을 통해 북한 유망협력 분야를 도출하였고, 무역경쟁력 분석을 통해 구체적인 농업협력 유망 품목군을 발굴하였다. 북한의 협력수요가 높은 분야는 농업R&D, 축산, 시설재배, 농기자재 및 인프라, 식품가공, 산림복구 등으로 파악되며, 북한 농식품산업의 비교우위 품목인 신선과일, 채소류, 어패류 등과 비교열위 품목인 가공식료품, 기초 농기자재 등이 우선적 농업협력 유망 품목으로 나타났다. 국제적인 대북제재가 완화되기 전이라도 북한의 식량 부족 문제에 대한 인도주의적 지원으로 북한이 비교열위에 있는 기초식료품과 식자재, 필수농업기자재 등 식량 및 생산 역량 강화 지원을 추진할 수 있다. 한편 대북제재 완화 및 남북관계 경색이 해소 된다면 북한의 대외수출경쟁력이 확보된 품목을 위주로 남북 교역(반출입) 재개를 통해 남북 농업간 상호보완적 협력을 확대하는 방향을 모색해 볼 수 있다.

수량화 이론을 이용한 도시부 터널 내 교통사고 영향요인에 관한 연구 - 부산광역시를 중심으로 -

임창식,최양원,Lim, Chang Sik,Choi, Yang Won 대한토목학회 2015 대한토목학회논문집 Vol.35 No.1

This study aims to investigate the characteristics and types of car accidents and establish a prediction model by analyzing 456 car accidents having occurred in the 11 tunnels in Busan, through statistical analysis techniques. The results of this study can be summarized as below. As a result of analyzing the characteristics of car accidents, it was found that 64.9% of all the car accidents took place in the tunnels between 08:00 and 18:00, which was higher than 45.8 to 46.1% of the car accidents in common roads. As a result of analyzing the types of car accidents, the car-to-car accident type was the majority, and the sole-car accident type in the tunnels was relatively high, compared to that in common roads. Besides, people at the age between 21 and 40 were most involved in car accidents, and in the vehicle type of the first party to car accidents, trucks showed a high proportion, and in the cloud cover, rainy days or cloudy days showed a high proportion unlike clear days. As a result of analyzing the principal components of car accident influence factors, it was found that the first principal components were road, tunnel structure and traffic flow-related factors, the second principal components lighting facility and road structure-related factors, the third principal factors stand-by and lighting facility-related factors, the fourth principal components human and time series-related factors, the fifth principal components human-related factors, the sixth principal components vehicle and traffic flow-related factors, and the seventh principal components meteorological factors. As a result of classifying car accident spots, there were 5 optimized groups classified, and as a result of analyzing each group based on Quantification Theory Type I, it was found that the first group showed low explanation power for the prediction model, while the fourth group showed a middle explanation power and the second, third and fifth groups showed high explanation power for the prediction model. Out of all the items(principal components) over 0.2(a weak correlation) in the partial correlation coefficient absolute value of the prediction model, this study analyzed variables including road environment variables. As a result, main examination items were summarized as proper traffic flow processing, cross-section composition(the width of a road), tunnel structure(the length of a tunnel), the lineal of a road, ventilation facilities and lighting facilities.

Analysis on the Driving Safety and Investment Effect using Severity Model of Fatal Traffic Accidents

임창식,최양원 대한교통학회 2011 대한교통학회지 Vol.29 No.3

In this study, we discuss a fatal accident severity model obtained from the analysis of 112 crash sites collected since 2000, and the resulting relationship between fatal accidents and roadway geometry design. From the 720 times computer simulations for improving driving safety, we then reached the following conclusions:. First, the result of cross and frequency-analyses on the car accident sites showed that 43.7% of the accidents occurred on the curved roads, 60.7% on the vertical curve section, 57.2% on the roadways with radius of curvature of 0 to 24m, 83.9% on the roads with superelevation of 0.1 to 2.0% and 49.1% on the one-way 2-lane roads; vehicle types involved are passenger vehicles (33.0%), trucks (20.5%) and buses (14.3%) in order of frequency. The results also show that the superelevation is the most influencing factor for the fatal accidents. Second, employing the Ordered Probit Model (OPM), we developed a severity model for fatal accidents being a function of on various road conditions so as to the damages can be predicted. The proposed model possibly assists the practitioners to predict dangerous roadway segments, and to take appropriate measures in advance. Third, computer simulation runs show that providing adequate superelevation on the segment where a fatal accident occurred could reduce similar fatal accidents by at least 85%. This result indicates that the regulations specified in the Rule for Road Structure and Facility Standard (description and guidelines) should be enhanced to include more specific requirement for providing the superelevation.

공압 제어용 전자밸브의 스프링, 시트바디, 피스톤의 품질개선을 통한 성능향상에 관한 연구

임창식,황종대,정영철,김석호 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.4

As pneumatic-related industry has advanced and the confidentiality of pneumatic components is required, thedemand for solenoid valves with ultrahigh ON/OFF time performance is rapidly spreading in aerospace-relatedindustries. Special-purpose pneumatic control solenoid valves, which have been researched and developed bythe state and whose operational suitability and reliability have been verified, are spreading to civil industry aswell. To improve the performance of solenoid valves for pneumatic control, the quality of the major parts wasimproved, and various experiments were performed on the main parts inside the valve body, such as springs,seat bodies, and pistons. Through the quality improvement of these major parts, the effects of the performanceimprovement in terms of ON/OFF time, flow rate, and leakage of solenoid valves were verified.

學習不振兒를 爲한 敎授-學習模型 開發 및 適用에 關한 硏究

林昌植 全北大學校 敎育大學院 1986 敎苑 Vol.- No.3

국내 회전교차로 설계지침 적용에 따른 속도패턴과 개선효과 분석 - 부산광역시를 중심으로 -

임창식,최양원,Lim, Chang-Sik,Choi, Yang-Won 대한토목학회 2013 대한토목학회논문집 Vol.33 No.1

To find out if modern roundabout is still effective under drivers behavior and driving conditions in Busan Metropolitan City, the effects before and after introduction of roundabout were analyzed. According to analysis on velocity profile at roundabout, velocity deviation decreased, and average vehicle speed was close to design speed. As a result, it has been confirmed that most roundabouts were properly built. In terms of traffic operation, average vehicle speed improved by 87.2% when a traffic intersection was replaced by a roundabout. therefore, it has been found out that the introduction of roundabout has a positive effect on increasing vehicle speed by reducing traffic congestion. In addition, annual benefits expected from the replacement from a traffic intersection to a roundabout were KRW 872 million as follows; KRW 410 million in traffic communication, KRW 39 million in transportation safety, KRW 255 million in energy saving, KRW 95 million in reduction of air pollution and KRW 73 million in reduction of traffic signal installation cost. In other words, if 10% (193 spots) of all traffic intersections (1,926 spots in total) in Busan City are replaced by roundabouts, the municipal authority would be able to save about KRW 168.3 billion. According to analysis on the benefits expected from the installation of roundabouts compared to the investment cost for traffic intersections, about KRW 679 million could be saved per roundabout. Considering 10% of all traffic intersections in the City of Busan, about KRW 131 billion could be saved annually. The traffic accidents in roundabout usually occur because drivers aren't aware of right-of-way rules. Once the right-of-way rules settle, the number of traffic accidents would significantly decrease. In addition, it is urgent to promote education and campaign for drivers, pedestrians and bikers on the roundabout.