오직 간절한 소망<SUB>所望</SUB>뿐입니다!

강지웅 (사)방송기자연합회 2017 방송기자 Vol.36 No.-

횡하중을 받는 SiC/Ti-15-3 MMC 복합재 계면영역에서의 탄소성 응력장분포거동(2)

강지웅 한국안전학회 2005 한국안전학회지 Vol.20 No.2

협력형 차량 안전 시스템의 잠재적 안전 효과 분석 연구

강지웅,송봉섭 한국ITS학회 2018 한국ITS학회논문지 Vol.17 No.2

본 논문에서는 대표적인 6대 협력형 차량 안전 시스템 대한 잠재적인 사회적 안전효과를 분석하는 방법론을 제시하고자 한다. 협력형 차량 안전시스템의 도입 및 확산을 위해서는 사 회적으로 어떠한 파급효과를 가져올지에 대하여 안전 시스템 별 정량적 분석이 필요하다. 국 내에서 사고유형 기반으로 분석이 이루어진 사례들이 있으나, 사고 시나리오를 기반으로 한 분석방법론을 찾아보기 어렵다. 이러한 방법론을 제시하기 위해서 우선 승용차나 승합차만 을 대상으로 한 국내 사망교통사고 데이터를 기반으로 사고 시나리오를 분류한다. 다음으로 사고 시나리오를 분석하여 협력형 차량 안전 시스템에 적용 가능한 시나리오를 선정하고 결 과적으로 사망 사고 빈도수를 통해 안전 시스템의 잠재적인 사회적 안전효과를 정량적으로 제시한다. 마지막으로 안전효과의 정량적 분석을 이용하여 협력형 차량 안전 시스템의 인증 을 위한 대표 평가 시나리오를 제시한다. In this paper, a methodology to analyze the potential safe benefit of six cooperative driver assistance systems via V2V (vehicle-to-vehicle) communications is proposed. Although it is quite necessary to assess social impact with respect to new safety technologies for cooperative vehicles with V2V communications, there are few studies in Korea to predict the quantitative safety benefit analysis. In this study, traffic accident scenarios are classified based on traffic fatality between passenger cars. The sequential collision type is classified for a multiple pile-up with respect to collision direction such as forward, side, head-on collisions. Then movement of surrounding vehicle is considered for the scenario classification. Next, the cooperative driver assistance systems such as forward collision warning, blind spot detection, and intersection movement assistance are related with the corresponding accident scenarios. Finally, it is summarized how much traffic fatality may be reduced potentially due to the V2V communication based safety services.

다이버시티 기법을 이용한 서해에서의 음선 모델기반 수중음향통신 시스템

강지웅,김현수,안종민,정재학,Kang, Jiwoong,Kim, Hyeonsu,Ahn, Jongmin,Chung, Jaehak 한국음향학회 2016 韓國音響學會誌 Vol.35 No.1

본 논문은 서해의 수중음향 통신 네트워크의 물리계층에 적합한 수중음향통신 시스템을 제안한다. 서해정점의 해양 관측정보와 Bellhop 음선 추적프로그램을 이용하여 서해정점의 수중 채널 모델을 구하고 이 수중 채널 모델을 이용하여 통신 변수들을 산출하고 다이버시티 기법이 응용된 CDMA(Code Division Multiple Access)와 SC-FDM(Single Carrier-Frequency Division Multiplexing) 전송방식을 이용한 음향 통신시스템을 설계한다. 설계된 통신시스템의 성능을 검증하기 위해 여러 통신환경에 대한 비트 오류율과 데이터 전송률을 연산하고 이로부터 서해안에서 긴 지연시간을 가지는 수중 채널과 낮은 Eb/No에서 사용가능한 수중 음향통신 기법을 제안한다. This paper proposes an adequate UWA (Underwater Acoustic) communication system of underwater communication network in the Yellow Sea. UWA channel is obtained from Bellhop ray tracing method with Yellow Sea environments. Based on this channel, communication parameters for CDMA (Code Division Multiple Access) and SC-FDM (Single Carrier-Frequency Division Multiplexing) using diversity techniques are calculated. In order to prove the proposed methods, BER (Bit Error Rate) and data rate are obtained using computer simulations and the adequate communication system for long rms delay spread and low Eb/No environments is proposed from the simulation.

가장 많이 받는 질문에 대한 답변

강지웅 (사)방송기자연합회 2013 방송기자 Vol.14 No.-

게임 문화의 공간적 진화 : Place

강지웅 한국콘텐츠진흥원 2014 케이콘텐츠 Vol.2014 No.5·6

라이프스킬 개발을 위한 초등체육수업 실천 연구

강지웅,박용남 한국초등체육학회 2017 한국초등체육학회지 Vol.23 No.1

본 연구의 목적은 라이프스킬 개발을 위한 초등체육수업의 실천과정과 결과를 공유하는 데 있다. 구체적으로는, 라이프스킬 개발을 위한 초등체육수업의 구성과 실천과정을 밝히고 결과적으로 학생들이 습득한 라이프스킬의 유형과 종류를 제시하고자 하였다. 연구 목적 달성을 위해 연구자가 가르치고 있는 남학생 4명, 여학생 4명을 연구 참여자로 선정하여 관찰, 면담, 학생 체육일기, 교사 반성일지를 통해 자료를 수집하였으며, 수집된 자료는 귀납적 내용분석(Elo & Kyngas, 2008)방법을 활용하여 분석하였다. 연구 결과로 첫째, 2009 개정 초등 체육과교육과정을 재구성하여 라이프스킬 습득을 위한 초등체육수업의 목표, 구성 원리, 구성 내용, 수업구조를 제시하였다. 둘째, 학생들이 습득한 라이프스킬은 목표설정과 노력, 자기관리, 나의 역할 다하기와 같은 자기 성장과 관련된 ‘뿌리 내리기’ 유형, 배려하기, 소통하기, 함께하기와 같은 관계 맺기와 관련된 ‘어우러지기’ 유형, 문제를 파악하고, 수용하고, 현명한 결정을 통해 문제를 해결할 수 있는 것과 관련된 ‘열매 맺기’ 유형으로 범주화되었다. 이러한 연구결과는 초등체육수업에서 라이프스킬 교육 실천하는데 있어 교사의 이해를 높일 수 있는 정보를 제공할 것이다. The aims of this study are to suggest the process and outcomes of life skills lessons in elementary physical education. For study, we took 9 participants, of whom 8 were the students (4boys, 4 girls) and a teacher. The data were collected through observations, in-depth interviews and documents(e.g. teacher’s reflective journal entries, students’ journal). The collected data were analyzed by an inductive content analysis(Elo & Kyngas, 2008). The key findings are as follows; firstly, the researcher re-organized and practiced the ‘2009 Revised National Curriculum for Elementary physical education’ for achieving life skills education to a set term of one year. Also, through this re-organization, students were able to achieve the National Curriculum goals and life skills at the same time. This goal was met by the 3 re-organization criteria. They are: 1) considering student’s interests and levels, 2) maintaining balance among diverse curriculum areas, 3)focusing on cooperation-oriented activities. In the class, the focus was specifically run with four practices; providing specific examples, opportunities of practices and allowing group activities and opportunities for reflections. Secondly, the life skills that students’ acquired were categorized into three types; 1) ‘rooting’- related to self-development, 2) ‘mingling’- related with establishing relationships, and 3) ‘fruiting’- related to solving problems. The results of this study will provide information that can enhance teachers' understanding of life skills education in elementary physical education classes.

Effects of Nucleating Agents on the Morphological, Mechanical and Thermal Insulating Properties of Rigid Polyurethane Foams

강지웅,김지문,김민수,김연희,장원,신대식,김우년 한국고분자학회 2009 Macromolecular Research Vol.17 No.11

This study examined the effects of liquid and solid additives on the morphological, mechanical and thermal insulating properties of rigid polyurethane foams (PUFs). The PUFs synthesized with tetramethylsilane (TEMS) as a liquid-type additive showed a smaller average cell size and lower thermal conductivity than those with the aerosil 200 and clay 30B as solid-type additives. When TEMS was added, the average cell size of the PUF became more uniform and finer due to the reduced surface tension of the polymer solution, which increased the nucleation rate and number of bubbles produced and reduced cell size. The PUFs with TEMS showed the highest closed cell contents among the PUFs prepared using TEMS, aerosil 200 and clay 30B. This suggests that the insulation properties of PUF can be determined by both the size of the cell structure and the amount of closed cell contents in the system. The compression and flexural strengths of the PUF increased slightly when the aerosil 200, clay 30B and TEMS were added compared those of the neat PUF. The reaction profiles of the PUFs showed a similar gel and tack free time with the reaction time among the PUFs synthesized with three different additives and neat PUF. This suggests that the nucleating additives used in this study do not affect the bubble growth of the chemical reaction, and the additives may act as nucleating agents during the formation of PUF. From the above results of the cell size, thermal conductivity, closed cell contents and reaction profile of the PUFs, liquid-type nucleating agent, such as TEMS, is more effective in decreasing the thermal conductivity of the PUF than solid-type nucleating agent, such as aerosil 200 and clay 30B.

복부 수술 후 발생한 유착성 소장폐쇄의 수술 예측 인자

강지웅,남정광,김병석,문덕진 대한대장항문학회 2010 Annals of Coloproctolgy Vol.26 No.3

Purpose: There is a long-standing debate about whether postoperative adhesive small bowel obstruction (SBO) is best managed operatively or nonoperatively. The aim of this study is to define predictive factors for surgical indication in the treatment of an adhesive SBO. Methods: Medical records and laboratory data of 211 patients who had a SBO after a laparotomy from January 2000 to December 2008 were reviewed retrospectively. The patients were divided into two groups according to the modality of SBO treatment: operatively and nonoperatively. The laboratory data and clinical parameters were compared between the two groups and a statistical analysis was performed. Results: A Mann-Whitney analysis revealed previous SBO history, amylase, erythrocyte sedimentation rate (ESR), creatine phosphokinase, drainage amount via a Levin tube to be significant factors associated with surgical management. A multivariate analysis showed drainage amount via a Levin tube of 500 mL/day or greater (P=0.007), amylase of 90 IU/L or greater (P=0.04), and ESR of 11 mm/hr or greater (P=0.03) to be independent predictive factors for surgery. Conclusion: Surgical management should be considered among adhesive SBO patients with elevated amylase (≥90 IU/L)and ESR (≥11 mm/hr) and with large drainage amount through the Levin tube (≥500 mL/day).

횡하중을 받는 SiC/Ti-15-3 MMC 복합재 계면영역에서의 탄소성 응력장분포거동(Ⅰ)

강지웅,김상태,권오헌 한국안전학회 2004 한국안전학회지 Vol.19 No.4

Unidirectional fiber-metal matrix composites have superior mechanical properties along the longitudinal direction. However, the applicability of continuous fiber reinforced MMCs is somewhat limited due to their relatively poor transverse properties. Therefore, the transverse properties of MMCs are significantly influenced by the properties of the fiber/matrix interface. In this study, the interfacial stress states of transversely loaded unidirectional fiber reinforced metal matrix composites investigated by using elastic-plastic finite element analysis. Different fiber volume fractions (5-60%) were studied numerically. The interface was treated as three thin layer (with different properties) with a finite thickness between the fiber and the matrix. The fiber is modeled as transversely isotropic linear-elastic, and the matrix as isotropic elastic-plastic material. The analyses were based on a two-dimensional generalized plane strain model of a cross-section of an unidirectional composite by the ANSYS finite element analysis code.