유한 요소법을 이용한 줄눈 콘크리트 포장 응력식 개발

정길수,김인태,류성우,조윤호,Jung, Kil-Su,Kim, In-Tai,Ryu, Sung-Woo,Cho, Yoon-Ho 한국도로학회 2008 한국도로학회논문집 Vol.10 No.2

한국형 포장 콘크리트에 있어 구조해석은 다양한 입력변수와 공용성 모형을 연결해주는 중간 매개체 역할을 하고 있어 그 중 요도가 매우 크다. 본 연구에서는 ABAQUS 구조해석 프로그램을 Shell 요소를 이용하여 콘크리트 포장의 거동을 분석할 수 있는 구조해석 기본 모형을 구축하였다. 이 모형을 Closed-Form Solution과 정확성이 검증된 Everfe 프로그램, 그리고 Solid 요소 모형과 비교하여 정확도를 검증하였다. 기본 Shell 모형을 이용하여 다양한 변수에 대한 구조해석을 수행하였으며 그 결과를 DB화하였다. SPSS 통계 프로그램과 해석 결과를 바탕으로 회귀식을 개발하였으며 온도 응력, 상향 응력, 하향 응력을 산정할 수 있는 응력식을 제안하였다. A pavement structure analysis model plays a very important role which can correlate input variables to performance models. In this research, a standard shell element model was developed by use of the ABAQUS program so that behaviors of concrete pavements be analyzed. The model was verified in terms of its accuracy by way of comparing the results to those gathered from closed-form Solutions, the Everfe program, and the ABAQUS program with a solid model. Many input variables were analyzed in the model, and the results were stored in a database. Based on the SPSS program, stress equations with respect to temperature and curling effects were developed. All models gave over 0.90 of R2 value except the case considering top-down curling (R2=0.86)

한진해운 사태에 대한 국내 매스컴 빅데이터 분석

정길수 ( Jung Kil-su ),박성훈 ( Park Sung-hun ),여기태 ( Yeo Gi-tae ) 한국해운물류학회(구 한국해운학회) 2020 해운물류연구 Vol.36 No.1

본 연구에서는 한진해운이 회생절차를 신청한 2016년 및 직전/직후년도(2015년/2017년)의 국내 언론매체에서 보도한 키워드를 분석함으로서 한진해운 사태가 미친 사회적 영향을 분석하는 것을 목적으로 한다. 연구의 방법은 빅데이터 쇼설마이닝 분석을 사용하였다. 매체별 추이분석 결과, 2016년 4월 자율협약 신청 시 높아진 매체관심도는 8월 한진해운의 법정관리 신청이 이루어지면서 최고조에 이르렀다. 특히 2017년 2월 17일 한진해운 파산선고 관련 소셜 매체 노출빈도 높았다. 긍부정 감성 추이분석 결과, 2015년 한진해운에 대한 "긍정 감성어"(32.6%)가 "부정 감성어 "(28.4)% 보다 높았다. 하지만 파산이 확정된 2017년도에는 향후 한국해운 및 물류에 대하여 "어려움 겪다(1위)"라는 키워드가 지배적이며, 특히 위기, 손실, 몰락, 분노 등의 격한 감정을 표현하는 감성어가 자주 노출되었다. 연관어 분석결과, 2017년의 경우 연관어 1위는 "파산(10,051)"이며, 다음으로 "경제(2위)", "한국(3위)", "기업(4위)", "정부(5위)"의 연관 키워드가 상위를 차지하였다. The purpose of this study was to analyze the key words of the reported contents by Korean media in 2016, when Hanjin Shipping applied for rehabilitation procedures, and the preceding year (2015) and the following year (2017), to determine the social effects of the case. An analysis of social mining of big data was used in this study. According to the results of a trend analysis by media, the media attention increased when a voluntary arrangement was applied in April 2016 and reached a crescendo when Hanjin Shipping filed for court receivership in August. On February 17, 2017, in particular, the declaration of bankruptcy of Hanjin Shipping was exposed in social media with high frequency. The results of sentiment analysis of positive and negative trends showed that “positive sentiment words” (32.6%) were higher than “negative sentiment words” (28.4%) on Hanjin Shipping in 2015. However, in 2017 when its bankruptcy was declared, the dominant key word was “having difficulty” (ranked No.1) for Korean shipping and distribution in the future, and sentiment words expressing strong feelings were frequently exposed, such as crisis, loss, collapse, and anger. An analysis of association key words refers to a technique in which association key words from various categories with related relationships are extracted and expressed in a map form. When “Hanjin Shipping” was used as a search word, the results of the analysis showed that the No. 1 association key word was "bankruptcy” (10,051), followed by “economics,” "Korea," "company,” and "government,” in order.

부정산출 변수를 고려한 컨테이너 터미널의 효율성 분석에 관한 연구

정길수 ( Jung Kil-su ),박성훈 ( Park Sung-hoon ),이해찬 ( Lee Hae-chan ),김유나 ( Kim Yu-na ),여기태 ( Yeo Gi-tae ) 한국해운물류학회(구 한국해운학회) 2020 해운물류연구 Vol.36 No.4

컨테이너 화물 처리량 증가에 따라 안정적인 화물 유치를 위한 터미널의 효율적인 운영이 필요한 실정이다. 본 연구에서는 국내 주요항 컨테이너 터미널의 효율성을 분석하는 것을 연구의 목적으로 한다. 국내 5대 항만에 위치한 컨테이너 터미널을 대상으로 DEA 분석을 실시하였으며, 동태적 변화를 알아보기 위해 Window 분석을 도입하였다. 부정산출변수를 고려한 터미널의 효율성 차이를 알아보기 위해 SBM 분석과 Undesirable DEA 분석을 도입하였다. 분석결과 SBM 분석에서는 JUCTC(정일울산컨테이너터미널), HPNTC(현대부산신항만), HJNPC(한진해운신항만), PNCOC(부산신항만터미널) 등의 효율성이 높게 나타났으며, Undesirable DEA에서는 JUCTC(정일울산컨테이너터미널), HJNPC(한진해운신항만), HPNTC(현대부산신항만), PNITC(부산신항국제터미널) 순으로 효율성이 높게 나타났다. 두 효율성의 차이가 크게 나타난 터미널은 BNCTC(비엔씨티터미널), DPCTC(동부부산터미널), HJNPC(한진해운신항만), HPNTC(현대부산신항만) 등으로 확인되었다. The efficient operation of terminals is required to stably attract freights in accordance with the increasing container cargo throughput. This study aims to analyze the efficiency of domestic container terminals in major ports. DEA analysis was conducted for container terminals located in top five Korean international ports, and window analysis was introduced to see dynamic changes. In addition to the general input variables that increase efficiency, undesirable variables that can decrease the efficiency of the terminal were inserted and analyzed. SBM and Undesirable DEA analysis were introduced to examine the differences in the efficiency of the terminal considering undesirable variable factors. In the SBM analysis result, JUCTC, HPNTC, HJNPC, and PNCOC showed high efficiency, and in the Undesirable DEA, JUCTC, HJNPC, HPNTC, and PNITC showed high efficiency in the descending order of JUCTC, HJNPC, HPNTC, and PNITC. The terminals that showed large differences between the two efficiencies were BNCTC, DPCTC, HJNPC, and HPNTC.

정기선사의 컨테이너 재고 수요예측모델 구축에 대한 연구

전준우(Jun-woo Jeon),정길수(Kil-su Jung),공정민(Jeong-min Gong),여기태(Gi-tae Yeo) 한국항만경제학회 2016 韓國港灣經濟學會誌 Vol.32 No.4

본 연구는 System Dynamics를 이용하여 선사 컨테이너 인벤토리의 수요를 장비 Type/size별 예측, Port별 예측, Weekly 예측을 통해 보다 정교한 예측모델을 구축하는 것을 연구의 목적으로 하였다. 예측은 중국의 상하이항과 얀티안항을 대상으로 하였다. 컨테이너 인벤토리는 수요가 많고 유효한 데이터를 산출할 수 있는 Dry 컨테이너 20’, 40’, High cube 40’으로 한정하였다. 시뮬레이션 기간은 2011년-2017년이며, 선사에서 실제 예측하는 단위인 Weekly 데이터를 활용하였다. 모델의 정확도 검증을 위해 절대비율 평균오차(MAPE)를 적용한 결과 상하이 Dry 40’ 수요, 상하이 Dry High cube 40’ 수요, 상하이 Dry 20’ 공급, 상하이 Dry 40’ 공급, 상하이 Dry High cube 40’ 공급예측 모델은 0%≦MAPE≦10%에 속하는 매우 정확한 예측 모델로 검증되었다. 그 외의 상하이 수요 · 공급 예측 모델은 10%≦MAPE≦20%에 속해 비교적 정확한 예측 모델로 검증되었다. 얀티안 Dry High cube 40’ 수요, Dry 20’ 공급 예측 모델은 0%≦MAPE≦10%에 속해 매우 정확한 예측 모델이며, 그 외의 얀티안 수요ㆍ공급 예측 모델은 10%≦MAPE≦20%에 속해 비교적 정확한 예측모델로 검증되었다. 본 연구의 예측 모델은 실제 선사에서 관리중인 데이터와 비교해도 높은 정확도를 갖는 것으로 나타났다. 본 연구에서 제시된 모델은 지역 수요예측 담당자 및 본부의 인벤토리 컨트롤 담당자가 참고자료로 유용하게 사용 가능하다. This study attempts to establish a precise forecast model for the container inventory demand of shipping companies through forecasts based on equipment type/size, ports, and weekly system dynamics. The forecast subjects were Shanghai and Yantian Ports. Only dry containers (20, 40) and high cubes (40) were used as the subject container inventory in this study due to their large demand and valid data computation. The simulation period was from 2011 to 2017 and weekly data were used, applying the actual data frequency among shipping companies. The results of the model accuracy test obtained through an application of Mean Absolute Percentage Error (MAPE) verified that the forecast model for dry 40’ demand, dry 40’ high cube demand, dry 20’ supply, dry 40’ supply, and dry 40’ high cube supply in Shanghai Port provided an accurate prediction, with 0%≤MAPE≤10%. The forecast model for supply and demand in Shanghai Port was otherwise verified to have relatively high prediction power, with 10%≤MAPE≤20%. The forecast model for dry 40’ high cube demand and dry 20’ supply in Yantian Port was accurate, with 0%≤MAPE≤10%. The forecast model for supply and demand in Yantian Port was generally verified to have relatively high prediction power, with 10%≤MAPE≤20%. The forecast model in this study also had relatively high accuracy when compared with the actueal data managed in shipping companies.

클러스터 상의 계산 노드에 대한 접근성 향상을 위한 웹 기반 인터페이스 아키텍처 연구

김희운(Huioon Kim),전경원(Kyoungwon Chun),정길수(Kil Su Jung),정영주(Youngjoo Chung) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11

In this paper, we propose an architecture of a web-based interface for the improvement of accessibility to computational resources on cluster. Using a web-based interface implemented according to this architecture, scientists who want to do an high performance required simulation or calculation use the computational resources on cluster easier than shell interface or something likes that. Our architecture is composed of 6 layers, each layer have several components. This 6-layered architecture provide interoperability and flexibility between each component. We also describe an use case of this architecture.

6차산업 체험 만족도에 따른 방문객의 재방문 동기에 관한 연구 - 화성송산포도축제를 중심으로 -

박문기 ( Park Moon-kee ),김진수 ( Kim Jin-su ),이진환 ( Lee Jin-hwan ),정길수 ( Jung Kil-soo ) 한국경영공학회 2020 한국경영공학회지 Vol.25 No.1

When considering the importance of the festival in the aspect of tourism development and local economy vitalization in Hwaseong, the accuracy diagnosis of reality related to current regional festival is required. In particular, it is necessary to prepare the plans of local festival vitalization to attract local residents and tourists since ‘Hwaseong Songsan Grape Festival’ should be in the direction to help the influx of tourists and cultural development for the local residents. It examines the elements making the residents and tourists related to Hwaseong local festival satisfy on the cultural tourism festival, and it will be able to seek for the better plan for developing local festival in Hwaseong as identifying the cause-effect relation between satisfaction factors and motivation of visitor's revisiting. The study was conducted focusing on ‘Hwaseong Songsan Grape Festival’ a representative cultural tourism festival in the region of Hwaseong. Although the result showed a tendency to coincide with the result of precedent studies, in the visiting motivation, it was found that the influence of experientiality and purchasingability was smaller than other elements that are deviant, sociability, interest, and cultural experientiality. Therefore, as a result, in the level of effectiveness increase through visiting motivation, it showed that improvement of satisfaction led to revisiting of behavior intention and effectiveness increase of recommendation intention. Moreover, it thought to be that since it should have complementary attraction of tourism, differentiating by securing various elements that effect on revisiting and recommendation intention can be the great foundation for increasing tourism of ‘Hwaseong Songsan Grape Festival’.

골 융합술을 하지 않은 전방경유 경추간판 제거술의 결과

박철형,김철진,정길수,김재은,김근수,이정청 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.7

Anterior cervical discectomy with or without interbody fusion has been conventionally used to treat patients with cervical disc diseases. However, discectomy without bone fusion has been abandoned due to the fear of early collapse of interbody space and recurrency. The author has analysed twenty-two cases of microsurgical cervical discectomy without bone fusion between Jan 1993 and Mar. 1994. All patients were followed up for more than 6 months or as long as 21 months with repeat interview, physical examination, and radiological evaluation. The anaysis revealed that the results were highly satisfactory in 2l cases with radiculopathies in terms of early ambulation, no discomfort in the iliac bone, and shorter hospital stay, but unsatisfactory in one case which needed reoperation due to postoperative scar. The above method which had demonstrated promising results is recommended for the patients suffering from radiculopathy.