회전타원체 보빈 형상의 거동에 관한 연구

강승희,안성호,임완권,김혜웅,Kang, Seung-Hee,Ahn, Sung-Ho,Rim, One-Kwon,Kim, Hye-Ung 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5

The initial trajectory of a spheroid configuration bobbin for precision guidance has been investigated by analyzing its aerodynamic load and six-degree-of-freedom motion. The effects of changes in the spheroidal head configuration, flow angle and lateral center-of-gravity offset are numerically studied using the commercial software "FLUENT". A wind tunnel test is also conducted to validate the numerical scheme and to examine effect of the Reynolds number on the flow around the bobbin. It is shown that the size of the separation bubble formed on the surface decreases significantly when the Reynolds number is varied between 110,000 and 140,000. At a zero flow angle, an oblate spheroidal head shows relatively moderate rotation while a prolate spheroidal head shows rapid rotation. The bobbin with a spherical head shape has little effect on the flow direction; however, the oblate bobbin is sensitive to the flow angle. The roll motion of the bobbin is greatly influenced by the lateral center-of-gravity offset and maximum dispersion is observed at half of the radius.

순환형 도시계획에 따른 LID기술의 물수지 분석

강승희 ( Sung Hee Kang ),허우명 ( Woo Myung Heo ),강상혁 ( Sang Hyeok Kang ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.8

Urbanization can be significantly affected the hydrologic cycle by increasing flood discharge and heat flux. In order to mitigate these modifications in urban areas, Low Impact Development (LID) technique has been designed and applied in Korea. In order to estimate runoff reduction rate using SWMM LID model, the characteristics of five LID techniques was firstly analyzed for water balance. Vegetated swale and green roof were not reduce flood discharge nor infiltration amount. On the other hand, porous pavement and infiltration trench were captured by infiltration function. The flood reduction rate with LID is substantially affected by their structures and properties, e.g., the percentage of the area installed with LID components and the percentage of the drainage area of the LID components.

항력리본이 장착된 자탄의 공력 해석 연구

강승희(Seung-Hee Kang),김진석(Jin-Suk Kim),안성호(Sung-Ho Ahn) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.4

The initial unfolding motion simulation of a sub-munition with drag ribbon for precision guidance and reliable operation has been investigated by analyzing its unsteady aerodynamic load and fluid structure interaction. The effects of change in the ribbon configuration and flow angle are numerically studied using a commercial software “XFLOW” based on Lattice-Boltzmann Method. It is shown that the motion is affect adversely by the separation bubble formed posterior part of the fuselage. The rolling moment for arming of the sub-munition is increased with angle of attack and rotational movement.

국소적으로 진행된 자궁경부암에서 방사선과 Cisplatin의 동시병합요법의 치료결과

강승희(Seung Hee Kang),서현숙(Hyun Suk Suh),양광모(Kwang Mo Yang),이응수(Eung Soo Lee),박성관(Sung Kwon Park) 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.1

Purpose : Despite a development of therapeutic machines and advance in modern radiation therapy techniques, locally advanced cervical carcinoma has shown high rate of local failure and poor survival rate. Combination of chemotherapy and radiotherapy demonstrated benefit in improving local control and possibly the overall survival. Our study was performed to evaluate effect of concurrent chemoradiation on locally advanced uterine cervical cancer. Methods and Materials : Twenty six patients with locally advanced stage(FIGO stage ⅡB with ≥5cm in diameter, Ⅲ, ⅣA) were treated with combination of radiation therapy and concurrent cisplatinum between May of 1988 and September of 1993 at out intracavitary irradiation. Cisplatinum was administered in bolus injection of 25mg/m² at weekly intervals during the course of external radiation therapy. Results : Of the 26 patients, twenty-five patients were evaluable for estimation of response. Median follow-up period was 25 months with ranges from 3 to 73 months. Stage ⅢB, Ⅲ, and ⅣA were 16, 5, 4 patients, respectively. Twenty patients were squamous cell carcinoma. REsponse was noted in all 25 patients: complete response(CR) in 17/25(68%), partial response(PR) in 8/25(32%). Of the 24 patients except on who died of sepsis at 3 months follow-up, seventeen patients(70.8%) maintained local control in the pelvis: 16/17(94.1%) in CR, 1/17(14.3%) in PR. Fourteen of the 17 patients with CR are alive disease free on the completion of follow-up. Median survival is 28 months for CR and 15 months for PR. Analysis of 5-year survival by stage shows 11/16(59.8%) in ⅡB, 3/5(60.0%) in Ⅲ, and 1/4(25.0%) in ⅣA. Overall 5-year survival rate was 55.2%. Ten patients recurred: 4 at locoregional. 3 in distant metastasis and 3 with locoregional and distant site. Toxicity by addition of cisplatinum was not excessive. conclusion : Although the result of this study was obtained from small number of patients, it is rather encouraging in view of markedly improved response rate compared with the results of histrical group.

2기(T3 또는 N1) 췌장암 환자들의 수술 후 방사선치료의 성적 및 고찰

김상원(Sang Won Kim),전미선(Misun Chun),김명욱(Myung Wook Kim),김욱환(Wook-Hwan Kim),강석윤(Seok Yun Kang),강승희(Seung Hee Kang),오영택(Young Taek Oh),이선영(Sunyoung Lee),양주노(Juno Yang) 대한방사선종양학회 2007 Radiation Oncology Journal Vol.25 No.4

목 적: 근치적 절제술을 받고 AJCC 병기 2기(T3 또는 N1)로 진단된 췌장암 환자들 중 수술 후 방사선치료를 받은 이들을 대상으로 국소 제어율 및 생존율을 분석하고자 한다. 대상 및 방법: 1996년 1월부터 2005년 12월까지 수술 후 보조적 요법으로 방사선치료 단독 내지는 동시 항암화학방사선치료를 받은 28명의 환자들의 기록을 후향적으로 분석하였다. 모든 환자들에게서 병리 소견상 췌장 주변 조직으로의 침윤이 있거나 췌장 주변 또는 후복강 내 대동맥 주변 임파절 전이가 확인되었다. 방사선치료는 수술 전영상학적인 자료에서 침범된 종양의 위치 및 수술 변연 부위를 중심으로 40∼57.6 Gy (중앙값 50 Gy)를 조사하였으며 병리 소견상 주변 임파절 전이가 확인된 경우엔 제 3 요추부위까지의 대동맥 주변 임파절 부위도 조사야에 포함시켰다. 동시 항암화학요법은 10명의 환자들에게서 병용되었다. 결 과: 최초의 실패 양상이 국소 재발이었던 환자는 13명(46%)였으며 이들 중에서 원격 전이가 같이 동반된 환자는 5명이었다. 호발 부위는 복강축(4명)과 대동맥 주변 임파절 부위였다. 또한 원격 전이가 최초의 실패 양상으로 나타난 환자는 국소재발이 동반된 환자들을 포함하여 12명이었다. 원격전이가 가장 흔히 나타난 곳은 간(10명)이었으며 복강전이, 폐전이 순이었다. 임파절 전이가 있는 환자들은 없는 환자에 비해 원격 전이의 가능성이 높았다(57.1%). 수술 변연 부위에 종양이 남아있는 환자들은 없는 환자들보다 국소 재발의 가능성이 높았다(57.1%). 전체 환자들의 무병 생존기간의 중앙값은 6개월이었으며 1년 및 2년 무병생존율은 각각 27.4%와 8.2%였다. 전체 생존기간의 중앙값은 11개월이었고 2년, 3년 생존율은 31.6%, 15.8%였다. 결 론: 2기 췌장암 환자들은 국소 재발 및 원격 전이의 가능성이 높은 고위험군으로 국소 제어율 및 전체 생존율의 향상을 위해서 수술 후 효과적인 방사선치료의 적극적인 시행 및 이후의 보조적인 전신 항암화학요법을 권고하여 시행하는 것이 바람직하다. Purpose: To analyze retrospectively the outcome of postoperative radiation therapy with or without concurrent chemotherapy for curatively resected stage II pancreatic cancer with T3 or N1 disease. Materials and Methods: Between January 1996 and December 2005, twenty-eight patients completed adjuvant radiation therapy at Ajou University Hospital. The patients had either pathologic T3 stage or N1 stage. The radiation target volume encompassed the initial tumor bed identified preoperatively, resection margin area and celiac nodal area. In the case of N1 patients, the radiation field extended to the lower margin of the L3 vertebra for covering both para-aortic lymph nodes bearing area. The median total radiation dose was 50 Gy. Ten patients received concurrent chemotherapy. Results: Thirteen patients (46%) showed loco-regional recurrences. The celiac axis nodal area was the most frequent site (4 patients). Five patients showed both loco-regional recurrence and a distant metastasis. Patients with positive lymph nodes had a relatively high probability of a distant metastasis (57.1%). Patients that had a positive resection margin showed a relatively high local failure rate (57.1%). The median disease-free survival period of all patients was 6 months and the 1- and 2-year disease free survival rates were 27.4% and 8.2%, respectively. The median overall survival period was 9 months. The 2- and 3-year overall survival rates were 31.6% and 15.8%, respectively. Conclusion: The pancreatic cancer patients with stage II had a high risk of local failure and a high risk of a distant metastasis. We suggest the concurrent use of an effective radiation-sensitizing chemotherapeutic drug and adjuvant chemotherapy after postoperative radiation therapy for the treatment of patients with stage II pancreatic cancer.

원예시설용 망의 압력강하 특성에 대한 실험적 연구

염성현,강승희,Yum, Sung Hyun,Kang, Seung-Hee 한국농공학회 2013 한국농공학회논문집 Vol.55 No.6

This study was carried out to present the pressure drop for various wind speeds through nine types of screens used in horticultural facilities. The screens have been widely used to prevent harmful insects from being entered into agricultural facilities, to reduce strong wind and to shade a light as well. Whatever the usage of the screens was, it was necessary to have good knowledge of how much the screen caused a pressure drop for wind speeds when analyzing both the inner thermal-flow distribution in the facility and the effect of reducing wind speed by using CFD. Furthermore, as for wind screens, the pressure drop for wind speeds was needed as a design load in evaluating the structural stability of the structures supporting the screens. Therefore, the pressure drop through the screens for wind speeds of 5~30 $m{\cdot}s^{-1}$ at about 5 $m{\cdot}s^{-1}$ interval and inflow angles of $0{\sim}45^{\circ}$ at an interval of $15^{\circ}$ was respectively measured in a subsonic wind tunnel. The relation of the pressure drop for various screens was well fitted as a secondorder polynomial expression.

부모와의 애착-신뢰와 학업스트레스와의 관계에서 성장신념과 학습동기의 매개효과

김성심(Sung-Sim Kim),강승희(Seung-Hee Kang) 한국학부모학회 2023 학부모연구 Vol.10 No.4

본 연구에서는 2020년도에 수집한 경기교육종단연구 초4 패널의 9차년도 고등학교 3학년 학생 데이터를 이용하여 부모와의 애착-신뢰 관계가 성장신념과 학습동기를 매개로 학업스트레스에 어떠한 영향을 미치는지를 살펴보았다. 이를 위해 구조방정식모형을 이용하여 분석하였으며, 결과는 다음과 같다. 첫째, 부모와의 애착-신뢰 관계 정도가 높을수록 자녀의 성장신념과 내재적 동기가 높게 나타나는 반면, 무동기, 외재적 동기, 학업스트레스는 낮게 나타났다. 둘째, 성장신념은 학생들의 내재적 동기를 증가시키는 반면, 무동기, 외재적 동기, 학업스트레스를 감소시켰다. 셋째, 학습동기는 동기유형과 무관하게 모두 학업스트레스를 증가시키며, 외재적 동기 > 내재적 동기 > 무동기 순으로 학업스트레스에 미치는 영향이 크게 나타났다. 넷째, 부모와의 애착-신뢰 관계와 학업스트레스 간의 관계에서 성장신념과 학습동기 유형에 따른 매개효과를 확인할 수 있었다. 이러한 연구결과는 학업스트레스 감소를 위해 부모와 자녀 간의 애착-신뢰 관계를 바탕으로 성장신념 향상을 위한 노력이 필요함을 시사한다. In this study, using the 9th-year high school 3rd-grade student data of the 4th-grade elementary school panel of the Gyeonggi Education Longitudinal Study collected in 2020, how attachment-trust relationships with parents affect academic stress through growth mindset and learning motivation as a medium was examined. To achieve this, an analysis using structural equation modeling was conducted, and the results were as follows. First, the higher the degree of attachment-trust relationship with parents, the higher a child's growth mindset and intrinsic motivation; however, this was observed with lower levels of amotivation, extrinsic motivation, and academic stress. Second, it was found that growth mindset increased students' intrinsic motivation while decreasing amotivation, extrinsic motivation, and academic stress. Third, learning motivation increased academic stress regardless of motivation type, and the effect on academic stress was found to be significant in the order of extrinsic motivation > intrinsic motivation > amotivation. Fourth, in the relationship between attachment-trust relationship with parents and academic stress, the mediating effect according to growth mindset and type of learning motivation was confirmed. These results suggest that efforts to enhance growth mindset based on the attachment-trust relationship between parents and their children are necessary to reduce academic stress.

논문 : 생물생산시설 및 환경공학 ; 풍동시험과 CFD를 통한 방풍망의 풍속저감 효과

염성현 ( Sung Hyun Yum ),강승희 ( Seung Hee Kang ),김승희 ( Seoung Hee Kim ),이상봉 ( Sang Bong Lee ),김민영 ( Min Young Kim ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.5

This study was carried out to analyze the installation effect of an anti-wind net on reducing wind velocity which was used to protect orchards as well as single-span plastichouses. The pressure drop through three types of anti-wind net was measured in a subsonic wind tunnel. The wind reduction through the anti-wind facility for several sets in respect to three types of the net and heights of the facility ranging from 3 to 11 m was analyzed by using computational fluid dynamics (CFD). The measured data showed that the pressure drop increased as an equation of the second degree of the inlet wind velocity. Numerical computations exhibited that the effect of wind reduction definitely augmented as the net size became smaller and increased with the height of the facility being heightened to some extent. For the typical and widely used anti-wind facility with a height of 5 m and a net size of 4mm, the amount of wind reduction came up to 5.1 m/s for the inlet wind velocity of 20 m/s, and also 7.6 and 10.1 m/s for the inlet wind velocities of 30 and 40 m/s, respectively. In case for the orchard`s longitudinal length to be within about 200 m, the appropriately effective height of the facility was predicted to be 5 m. Finally, the negative total pressure on the top face of the single-span plastichouse certainly reduced for all the cases with the anti-wind facility being installed. In particular, the reduction of the negative total pressure was more considerable as the inlet wind velocity increased.

높이 5m를 갖는 과수원 방풍망의 구조안전성에 관한 연구

염성현(Sung Hyun Yum),강승희(Seung Hee Kang),전종길(Jong Gil Jeon),이상봉(Sang Bong Lee),김민영(Min Young Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3

코로나19 전후 고등학생의 부모-자녀 의사소통과 학업성 취의 관계에서 정신건강과 자기주도학습의 매개효과

김성심(Sung-Sim Kim),강승희(Seung-Hee Kang) 한국학부모학회 2023 학부모연구 Vol.10 No.1

본 연구에서는 부산교육종단연구(BELS) 중1 패널의 4차(BELS 2019, 고1)와 5차(BELS 2020, 고2) 데이터를 이용하여 고등학생의 부모-자녀 의사소통이 정신건강과 자기주도학습을 매개로 학업성취도에 어떠한 영향을 미치는지에 대해 코로나19 전후를 중심으로 살펴보았다. 이를 위해 대응표본 t-검정과 구조방정식모형을 이용하여 분석한 결과는 다음과 같다. 첫째, 코로나19 이후 정신건강과 수학 성취도는 하락하였으며, 자기주도학습과 국어, 영어 성취도는 상승하였다. 둘째, 부모-자녀 의사소통은 정신건강과 자기주도학습에 정적으로 유의한 영향을 미쳤다. 또한 정신건강은 자기주도학습에 정적인 영향을, 자기주도학습은 학업성취도에 정적인 영향을 미치는 것으로 나타났다. 셋째, 부모-자녀 의사소통은 자기주도학습을 매개로 학업성취도에 간접효과를 나타내었으며, 정신건강 또한 자기주도학습을 매개로 학업성취도에 간접효과를 나타내었다. 이러한 연구결과는 부모-자녀 의사소통이 고등학생의 정신건강, 자기주도학습에 영향을 미치는 만큼 부모와 자녀 간의 원활한 의사소통을 위한 부모교육이 필요함을 시사한다. In this study, using the 4th (2019) and 5th (2020) data of the 1st grade panel in the middle school of the Busan Longitudinal Study of Education, we looked at how high school students' parents-children communication affects their academic achievement through mental health and self-directed learning, focusing on pre- and post-COVID 19. For this purpose, the results of analysis using the paired sample t-test and structural equation model are as follows. First, after COVID 19, achievement in mental health and mathematics declined, while self-directed learning, Korean, and English achievement increased. Second, parents-children communication had a positively significant effect on mental health and self-directed learning. In addition, it was found that mental health had a positive effect on self-directed learning, and self-directed learning had a positive effect on academic achievement. Third, parents-children communication showed an indirect effect on academic achievement through self-directed learning and mental health showed an indirect effect on academic achievement through self-directed learning. The implications are as follows. Since communication between parents and their children affects the emotions and cognition of their children, it is necessary to recognize the importance of the role of parents in the family and to provide parental education for smooth communication within the home.