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장복진(Jang, Bok-Jin),여운광(Yeo, Woon-Kwang),이종국(Lee, Jong-Kook),박광순(Park, Kwang-Soon) 한국해안해양공학회 2007 한국해안해양공학회 논문집 Vol.19 No.4
해수면의 상태를 보고 파고를 측정하는 목측은 선박이나 먼 바다에서의 파랑관측 방법으로 여전히 이용되고 있으며, 오랜 경험을 가진 숙련자의 경우에는 상당히 정확하게 파고를 관측할 수 있다. 이러한 목측의 표준지표로 뷰퍼트(Beaufort) 풍력계급표가 가장 널리 이용되고 있다. 그러나 이 지표에 설명된 해수면의 모양은 연구자 또는 일반인에게는 친숙하지 않기 때문에 파고별 대표영상 등의 보다 구체적인 참고자료가 필요하다. 현대의 현장계측기술은 실시간으로 해양관측자료를 획득할 수 있는 수준에 이르렀으며, 기존의 파고 및 기상 관측시설과 함께 현장의 해상상태 영상자료까지 획득할 수 있게 되었다. 본 연구에서는 속초 조도동방등표에 설치되어 운영 중인 실시간해양관측 시스템에 무선영상전송장치를 설치하여 파랑자료와 영상이미지를 수집하고 유의파고별로 현장이미지를 비교 및 분류하였다. 관측된 해상상태 영상들과 뷰퍼트 풍력계급표의 해면 상태 설명과 비교한 결과 해상상태 영상자료의 가치를 확인할 수 있었다. 뷰퍼트 풍력계급표는 순수하게 목측이나 파고척을 이용하여 목측으로 만들어진 것에 비해 본 연구의 결과는 정밀한 파고센서와 과학적인 해상상태 영상정보 수집으로 파고의 실체적인 모습을 파악할 수 있었으며 관측파고의 신뢰성을 제고할 수 있는 기회가 되었다. The eye measurement to observe the sea surface condition and estimate the wave height has been used in the open sea or the ship. The experts in the eye estimation can measure the wave height very accurately. The Beaufort wind scale is most widely used as a standard index of the eye measurement. However, more definite reference data such as the representative images by each wave heights must be necessary because the appearances and explanations in the Beaufort wind scale are not enough to understand the sea surface condition far the researcher and the public. The modern field data acquisition technique has been developed to measure wave heights, ocean weather data and even images of the sea surface in real-time. In this study, the wireless field image transmitting system for wave heights and images is installed in the real-time ocean measurement system of Chodo light tower near Sokcho city in South Korea. The wave heights and surface images acquired from the real time system in the field are compared with explanations of the Beaufort wind scale. The wave heights and images measured with the precision ultrasonic wave sensor and the scientific sea surface image transmitting system should be helpful to obtain more precise and definite information than the data from the Beaufort wind scale.
운영환경을 고려한 KTX 안티롤바의 구조동특성 계측시험 평가 및 너클부의 표면피로마모 감소방안 연구
장형진(Hyung Jin Jang),전광우(Kwang Woo Jeon),신광복(Kwang Bok Shin),김진우(Jin Woo Kim),김대식(Dae Sik Kim),정연일(Yeon Il Jeong) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
본 연구는 KTX 안티롤바 너클부의 표면피로마모 특성을 개선하기 위하여 시험 및 수치해석적 방법을 사용하였다. 실험의 경우 KTX 안티롤바의 강재너클 구조와 KTX-산천의 얇은 금속판과 고무가 층을 이루는 탄성너클 구조에 대해 호남선의 운행환경을 고려한 구조동특성을 비교 평가하였다. 이때, 가속도 및 응력 데이터를 각각 측정하였다. 시험결과 분석을 통해 안티롤바 커넥팅로드의 홀 사이즈 증가가 요구되나, KTX 안티롤바 너클구조의 표면피로마모를 감소시키기 위한 최선의 해결책으로 탄성너클 구조가 제안되었다. 수치해석의 경우 KTX 안티롤바 강체 및 탄성너클 구조에 대해 LS-DYNA3D를 사용하여 구조동특성 해석을 수행하였으며, 시험과 비교평가를 통해 사용된 유한요소모델의 신뢰성을 확보하였다. 수치해석 결과 강체너클이 적용된 안티롤바의 응력 및 속도장 보다 탄성너클 구조가 너클과 커넥팅로드 사이의 상대적 접촉이 감소하여 응력 및 속도장이 좀 더 적정한 것으로 나타났다. 따라서, KTX 안티롤바에 탄성너클 구조의 적용이 표면피로마로 특성을 향상시킬 수 있을 것으로 사료된다. In order to improve the surface fatigue wear property of the knuckle part of KTX anti-roll bar, the experimental and numerical approach was used in this study. In the experiment, acceleration and stress data for the steel knuckle structure (rigid knuckle) of KTX anti-roll bar and the thin steel plate/rubber layeredknuckle structure (elastic knuckle) of KTX-SANCHUN anti-roll bar, respectively, were measured to evaluate and compare its structural dynamic characteristics under operating environments of Honam line. Through the analysis of the results of the experiment, the elastic knuckle structure was suggested as best solution to reduce the surface fatigue wear of the knuckle structure of KTX anti-roll bar, although the hole size increase for connecting rod of anti-roll bar was required. In the numerical approach, the structural dynamic analysis using LS-DYAN3D was conducted for the rigid and elastic knuckle structure of KTX antiroll bar, and the reliability of the used finite element models was ensured by comparative evaluation with experiment. The numerical results showed that the stress and velocity field in the elastic knuckle structure more moderated resulting from the reduction of relative contact between the knuckle and connecting rod than the stress and velocity field in anti-roll bar to which the rigid knuckle was applied. Therefore, it is expected to improve its surface fatigue wear characteristics due to the application of the elastic knuckle structure of KTX anti-roll bar.
A Study of Hygrothermal Behavior of ACF Flip Chip Packages With Moiré Interferometry
Jin-Hyoung Park,Kyung-Woon Jang,Kyung-Wook Paik,Soon-Bok Lee IEEE 2010 IEEE transactions on components and packaging tech Vol.33 No.1
<P>A primary factor of anisotropic conductive film (ACF) package failure is delamination between the chip and the adhesive at the edge of the chip. This delamination is mainly affected by the thermal shear strain at the edge of the chip. This shear strain was measured on various electronic ACF package specimens by micro-Moire interferometry with a phase shifting method. In order to find the effect of moisture, the reliability performance of an adhesive flip-chip in the moisture environment was investigated. The failure modes were found to be interfacial delamination and bump/pad opening which may eventually lead to total loss of electrical contact. Different geometric size specimens in terms of interconnections were discussed in the context of the significance of mismatch in coefficient of moisture expansion (CME) between the adhesive and other components in the package, which induces hygroscopic swelling stress. The effect of moisture diffusion in the package and the CME mismatch were also evaluated by using the Moire interferometry. From Moire measurement results, we could also obtain the stress intensity factor <I>K</I>. Through an analysis of deformations induced by thermal and moisture environments, a damage model for an adhesive flip-chip package is proposed.</P>
Jang, Jae Seong,Shin, Dong Gue,Cho, Hye Min,Kwon, Yujin,Cho, Dong Hui,Lee, Kyung Bok,Park, Sang Soo,Yoon, Jin,Jang, Yong Seog,Kim, Il Myung The Korean Gastric Cancer Association 2013 Journal of gastric cancer Vol.13 No.4
Purpose: In Korea, the entire population must enroll in the national health insurance system, and those who are classified as having a lower socioeconomic status are supported by the medical aid system. The aim of this study was to evaluate the association of the medical insurance status of gastric cancer patients with their survival after gastrectomy. Materials and Methods: A total of 247 patients who underwent surgical treatment for gastric cancer between January 1999 and December 2010 at the Seoul Medical Center were evaluated. Based on their medical insurance status, the patients were classified into two groups: the national health insurance registered group (n=183), and the medical aid covered group (n=64). The survival rates were calculated using the Kaplan-Meier method. Results: The median postoperative duration of hospitalization was longer in the medical aid covered group and postoperative morbidity and mortality were higher in the medical aid group than in the national health insurance registered group (P<0.05). The overall 5-year survival rate was 43.9% in the medical aid covered group and 64.3% in the national health insurance registered group (P=0.001). Conclusions: The medical insurance status reflects the socioeconomic status of a patient and can influence the overall survival of gastric cancer patients. A more sophisticated analysis of the difference in the survival time between gastric cancer patients based on their socioeconomic status is necessary.