成長據點理論과 據點開發戰略

李喜演 대한지리학회 1984 대한지리학회보 Vol.- No.21

GIS를 이용한 생활폐기물의 수거권역설정과 수거차량의 순회경로계획에 관한 연구

이희연,임은선 한국공간정보학회 2001 한국공간정보학회지 Vol.9 No.1

본 연구는 공공성을 지닌 편익 서비스로 인식되고 있는 쓰레기 수거 서비스를 보다 효율적으로 공급하기 위해서 쓰레기 수거권역을 설정하고 설정된 권역내에서 수거차량의 순회경로계획을 분석하는데 목적을 두었다. 본 연구에서는 합리적이고 보다 과학적인 쓰레기의 수거체계를 수립하기 위해 가장 기본적인 자료가 되는 쓰레기 배출지점별 배출량을 추정하고, 쓰레기 수집구역을 구축하였다. 이를 토대로 하여 지역분할방법을 이용하여 수거권역을 설정하였고, 쓰레기를 수거하는 차량의 순회결로를 효율적으로 계획할 수 있는 경로선정 방법도 도입하였다. GIS를 기반으로 하는 수거권역의 설정은 행정동별로 이루어지고 있는 수거업무를 보다 효율적으로 수행할 수 있는 것으로 분석되었다. 또한 경로선정방법을 도입할 경우 공차회송비용을 줄이면서 최소의 비용으로 경로계획의 수립이 가능함을 보여주었다. E따라서 쓰레기 수거서비스 체계를 구축하는데 있어서 GIS를 기반으로 하는 지역분할방법과 경로선정방법을 도입한다면 보다 신속하고 효율적으로 서비스를 제공하는데 필요한 정보를 제공할 수 있을 것이다. Solid waste collection service is viewed as one of the most important public services in urban area. The purpose of this study is to apply the GIS based regional partitioning and arc routing methods for solid waste collection districting and vehicle routing-scheduling in order to provide waste collection service more efficiently. In this study, solid waste deposit sites are derived from the centroid of each building and the amount of solid waste is deduced based on the number of households and establishments. The regional partitioning procedure is performed based on waste collection zones which are constructed from waste deposit sites. The result of this study shows that solid waste collection districts which are delineated by regional partitioning method are able to increase efficiencies and cut costs in performing solid waste collection services. Also the output of vehicle-scheduling from the analysis of arc routing may provide more efficiently and quickly manage the scheduling of the residential solid waste collection routes, reducing costs with minimal deadheading costs. Therefore, the application of GIS based on regional partitioning and arc routing methods would be very useful to construct a solid waste management system by supplying the important and flexible informations for solid waste collection districts and vehicle routing-scheduling for waste collection.

주시거리에 따른 모의 시각장애의 신체 안정성 변화

이희연,류영욱,추병선 대한시과학회 2023 대한시과학회지 Vol.25 No.3

목적 : 신체균형 측정기를 이용하여 주시거리와 다양한 시각 상태가 신체 안정성에 미치는 영향을 알아보고자하였다. 방법 : 대상자는 총 23명(23.92±2.09세)으로 진행하였으며, 시각 조건은 모두 ‘완전교정, 흐림 조건(시력 0.5 logMAR 미만) 그리고 10° 이내의 시야’이다. 신체 안정성 측정은 ‘3D Guidance‘를 사용하였다. 결과 : 완전교정 상태에서는 주시거리 간 통계적으로 유의한 차이는 없었다(p>0.050). 그러나 흐림 조건에서는주시거리에 따라 측면 및 전·후면 흔들림에서 유의한 차이가 확인되었으며(p=0.004, p=0.027), 시야가 10° 이내로 제한되었을 때에도 유의한 신체 흔들림이 관찰되었다(p<0.050). 결론 : 주시거리에 따라 신체 안정성의 변화가 나타나며, 특히 흐림과 제한된 시야 상태에서는 주시거리에따른 차이가 더 유의하였다. Purpose : This study aimed to investigate the effects of viewing distance and different vision conditions on postural stability using a body equilibrium measurement device. Methods : The total number of participants was 23 (23.92±2.09 years old), and the visual condition for all was 'full correction, blurred condition (visual acuity less than 0.5 logMAR), and within 10 degrees of field of view.' Body stability measurements were conducted using '3D Guidance.' Results : There was no statistically significant difference in the gaze distance under the condition of full correction (p>0.050). However, under the blurred condition, significant differences were observed in lateral, anterior, and posterior instability depending on the gaze distance (p=0.004, p=0.027), and significant body instability was also observed when the field of view was restricted to within 10 degrees (p<0.050). Conclusion : Changes in postural stability were evident based on gaze distance, with greater differences were observed between distant and near gaze distances, especially under conditions of blur condition and limited VF.

서로 다르지만, 존중하는 것

이희연 우리신학연구소 2014 갈라진 시대의 기쁜소식 Vol.- No.1052

지역노동시장의 직종별 학력수준으로 측정된 인적자본의 외부효과 분석

이희연,박유진 국토연구원 2014 국토연구 Vol.81 No.-

In the knowledge-based economy there has been a growing interest in human capital externality. The purpose of this study is to analyze human capital externalities using hierarchical linear model, decomposing determinants of wages into two levels involving workers(level-1) nested within regional labor markets(level-2). Each worker was classified by 4 distinct occupational classes and 3 educational level(required/over/under-education). The main results are as follows; First, wage compensation of over-educated worker is low compared to the required academic schooling, Overeducated workers suffer wage penalty compared with their counterparts who retain equivalent degree but are not overeducated in their jobs. However, in a regional labor market, the external effect of the over-education level shows larger than that of the required education level. Over-education in regional labor markets has the positive social return, though overeducated individual had negative private return, indicating that overeducation wage penalty of individual worker could be overcome by human capital externality in regional labor markets. The main contribution of the study is the differential effects of human capital externalities according to average required/over/under-education level in regional labor markets. Thus, over education is not viewed as simply inefficient education investment, rather than highlighting the positive external effects of knowledge spillover held by overeducated workers. 지식기반사회로 진입하면서 인적자본의 외부효과에 대한 관심이 매우 높아지고 있다. 본 논문은 학력, 업무능력, 지식 수준을 기준으로 138개 직종을 고학력-고숙련, 고학력, 고숙련, 저학력-저숙련직종으로 분류하여 직종에 따른 적정/과잉/과소학력의 외부효과를 비교하였다. 위계선형모델을 통해 추정된 결과 근로자 개인이 과잉학력 상태일 경우 적정학력에 비해 임금보상이 낮게 나타나 교육투자가 비효율적으로 이루어지고 있음을 말해준다. 그러나 지역노동시장에서 과잉학력은 적정학력에 비해 인적자본의 외부효과가 더 크게 나타났다. 따라서 단순히 과잉학력을 비효율적 교육투자라는 부정적 관점을 부각시키기보다는 과잉학력 근로자들이 보유한 지식의 파급효과를 상승시키는 전략을 모색하여야 할 것이다.

청소년 또래문화 조사연구

이희연 한국청소년정책연구원 1994 한국청소년연구 Vol.- No.17

시장설계이론을 이용한 공항 슬롯 재할당 메커니즘 개발

이희연,정지혁,이덕주 대한산업공학회 2022 대한산업공학회 추계학술대회논문집 Vol.2022 No.11

전이성 위암의 새로운 치료 요법

이희연,고윤호 대한내과학회 2018 대한내과학회지 Vol.93 No.1

Despite advances in cancer therapy, gastric cancer has a poor prognosis and high cancer-related mortality. Based on the molecular characteristics of cancer, specific targeted therapies have shown clinical benefits for various tumors. In addition, immunotherapy using immune checkpoint inhibitors has led to a paradigm shift in cancer treatment and shown remarkable results in some solid tumors. Although immunotherapy has been actively applied to gastric cancer, the efficacy is unsatisfactory compared with other solid tumors, such as melanoma and lung cancers. This is because of the complex mechanism of gastric cancer, tumor heterogeneity, heterogeneity among patients, and the absence of appropriate biomarkers to predict response. An effective new cancer treatment strategy that combines targeted therapies and various immunotherapies based on biological markers such as tumor mutation burden and microsatellite instability is urgently needed. Furthermore, customized treatment is necessary to overcome tumor heterogeneity.

제5주제 - 저출산 고령화 시대의 도시정책 패러다임의 변화

이희연,정창무(토론자),김광중(사회자) 서울대학교 환경대학원 2017 環境論叢 Vol.59 No.-

Clinical Characteristics of Clear Cell Ovarian Cancer: A Retrospective Multicenter Experience of 308 Patients in South Korea

이희연,홍지형,변재호,김희준,백선경,김진영,김기향,윤진아,김정아,박권오,이효진,이정림,원영웅,김일환,배우균,박경화,Der Sheng Sun,이수이,이민영,이국진,홍숙희,정윤화,안호정 대한암학회 2020 Cancer Research and Treatment Vol.52 No.1

Purpose The purpose of this study was to evaluate clinical characteristics and treatment pattern of ovarian clear cell carcinoma (OCCC) in Korea and the role of adjuvant chemotherapy in early stage. Materials and Methods Medical records of 308 cases of from 21 institutions were reviewed and data including age, performance status, endometriosis, thromboembolism, stage, cancer antigen 125, treatment, recurrence, and death were collected. Results Regarding stage of OCCC, it was stage I in 194 (63.6%), stage II in 34 (11.1%), stage III in 66 (21.6%), and stage IV in 11 (3.6%) patients. All patients underwent surgery. Optimal surgery (residual disease  1 cm) was achieved in 89.3%. Majority of patients (80.5%) received postoperative chemotherapy. The most common regimen was taxane-platinum combination (96%). Median relapse-free survival (RFS) was 138.5 months for stage I, 33.4 for stage II, 19.3 for stage III, and 9.7 for stage IV. Median overall survival (OS) were not reached, 112.4, 48.7, and 18.3 months for stage I, II, III, and IV, respectively. Early-stage (stage I), endometriosis, and optimal debulking were identified as favorable prognostic factors for RFS. Early-stage and optimal debulking were also favorable prognostic factors for OS. Majority of patients with early-stage received adjuvant chemotherapy. However, additional survival benefit was not found in terms of recurrence. Conclusion Majority of patients had early-stage and received postoperative chemotherapy regardless of stage. Early-stage and optimal debulking were identified as favorable prognostic factors. In stage IA or IB, adding adjuvant chemotherapy did not show difference in survival. Further study focusing on OCCC is required.