자궁 육종의 임상 및 병리학적 특성에 관한 연구

강순범,김종혁,손성기,박중신,이효표 대한암학회 1991 Cancer Research and Treatment Vol.23 No.4

Radial multi-quantum well ZnO nanorod arrays for nanoscale ultraviolet light-emitting diodes

Kang, Jang-Won,Kim, Byeong-Hyeok,Song, Hui,Jo, Yong-Ryun,Hong, Sang-Hyun,Jung, Gun Young,Kim, Bong-Joong,Park, Seong-Ju,Cho, Chang-Hee Royal Society of Chemistry 2018 Nanoscale Vol.10 No.31

<P>Since semiconducting ZnO has attractive properties such as wide bandgap and large exciton binding energy, it has motivated us to realize efficient ultraviolet (UV) light-emitting diodes (LEDs). Furthermore, facile growth of ZnO nanostructures has triggered numerous research studies to examine them as nanoscale building blocks for optoelectronic devices. Here, we demonstrate the growth of ZnO-based core-shell p-n homojunction nanorod arrays with radial MgZnO/ZnO multiple quantum wells (MQWs) and report the characteristics of a core-shell ZnO nanorod LED. The shell layers of MgZnO/ZnO MQWs and p-type antimony-doped MgZnO were epitaxially grown on the surface of ZnO core nanorod arrays. By introducing the radial MQWs, the photoluminescence intensity was greatly increased by 4 times, compared to that of the bare ZnO nanorod array, suggesting that the core-shell MQWs can be used to realize the nanoscale ZnO LEDs with high internal quantum efficiency. As the injection current increased, the EL intensity of UV emission at 375 nm from the MgZnO/ZnO MQWs strongly increased without shifting of the emission peak because of the non-polar nature of MQWs grown on the side walls of the ZnO nanorods. These results highlight the potential of an integrated nanoscale UV light emitter in various photonic devices.</P>

High-Volume Plasma Exchange in Patients with Acute Liver Failure: Initial Experience in Single Liver-Transplantation Center

( Nam Joong Kim ),( Sejong Chun ),( Dong-hyun Sinn ),( Semi Kim ),( Wonseok Kang ),( Geum-youn Gwak ),( Yong-han Paik ),( Moon Seok Choi ),( Joon Hyeok Lee ),( Kwang Cheol Koh ),( Seung Woon Paik ),( 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: Acute liver failure is a serious condition which results in multiple organ failure. Recent study suggested that high-volume plasma exchange (HVP) defined as exchange of 8-12 or 15% of ideal body weight with fresh frozen plasma, improves survival in acute liver failure (ALF) patients. Herein, we report initial experience using HVP as a bridge treatment in patients with ALF at our center. Methods: We retrospectively reviewed consecutive 36 patients who were enlisted for a liver transplantation (LT) due to ALF between 2014 and 2017 at Samsung medical center in Korea. HVP was initiated in patients with ALF in May 2015 at our institution. The primary endpoint was comparison of overall survival before and after the implementation of HVP with intention-to-treat analysis. Results: There were 18 cases of ALF before HVP was adopted and 18 cases of ALF afterwards. Mortality was observed in 12 patients (33.3%). Among 18 patients who presented with ALF after implementation of HVP program, 9 patients received HVP (50.0%). The 60-day mortality rate was 88.9% and 59.3% for patients who received HVP and for patients who did not (P=0.111). In intention-to-treat analysis, overall outcome was improved after implementation of HVP (77.8% vs. 55.6% at 60-days), although the difference was statistically marginal (P=0.207). When stratified according to HVP and LT, 60-day survival rate was 100%, 80.0%, 66.7% and 33.3% for those with LT+/HVP+ (n=6), LT+/HVP- (n=15), LT-/HVP+ (n=3), and LT-/HVP-(n=12), respectively (P=0.013). Conclusions: In this real-world, intention-to-treat analysis, outcome was improved after HVP implementation for ALF patients. HVP can be a viable option to improve outcome for patients presenting with ALF.

사이드 게이트가 적용된 사출성형 평판 제품의 치수 편차에 대한 연구

장진혁(Jin-Hyeok Jang),강지혜(Ji-Hye Kang),김현영(Hyun-Young Kim),남호동(Ho-Dong Nam),안중근(Joong-Keun An) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12

One of the important factors in the design of injection molded product is design for injection mold gate. Generally, direct or valve gates are applied to flat plate parts in the case of flat plate parts among various injection molded parts. The side gate is sometimes used because it can not be applied for the purpose of the parts of usage of aesthetic point. When the side gate is applied, dimensional deviation occurs in flow direction because the closer the gate is, the higher the injection pressure is received. In this paper, I would like to discuss what to consider when applying side gates to flat plate injection molded parts.

USN을 이용한 GIS 기반의 재선충 예찰용 삼림 감시 시스템

강현중(Hyun-joong Kang),임혁진(Hyeok-jin Im),이명훈(Meong-hun Lee),여현(Hyun Yoe) 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.7

제주지역 노인자원봉사활동에 관한 연구

정광중(Kwang Joong Jeong),황석규(Suk Kyu Hwang),강준혁(Jun Hyeok Kang) 제주학회 2010 濟州島硏究 Vol.33 No.-

본 연구는 제주지역 노인들이 지역사회 일원으로서 자신들의 역할을 수행하며 사회에 공헌함과 동시에 건강하고 만족스런 노후생활을 영위할 수 있도록 하기 위해 노인들의 자원봉사활동 실패를 파악하고 그에 따른 정책, 교육 및 현실 방안들을 제시한다, 조사결과에 따른 제주지역 노인의 자원봉사활동실태는 다음 몇 가지 특성으로 요약된다. 첫째, 자원봉사활동에 참여한 노인들은 주로 70대의 연령층이며, 5년 미만 동안 주 1~4회에 참여하며, 평균 1~4시간의 활동을 한다. 고소득층인 남성보다 저소득층인 여성들이 자원봉사활동에 대한 참여비율이 높다. 둘째, 노인들은 복지시설과 지역사회의 차원에서 독거노인/말벗서비스 및 환경정리의 활동을 주로 전개하며 담에게 도움을 주고 싶고 여가시간을 보람차게 지내길 원한다. 또한 노인들은 자원봉사활동을 통해 폭넓은 인간관계를 형성하며, 자긍심을 얻고 있다. 셋째, 노인들은 자원봉사활동에 관한 정보를 복지기관, 친구 및 지인, 그리고 대중매체를 통해 얻고 있고. 자신의 자원봉사활동에 높은 만족감을 표현하며, 가족들의 관심도 높다. 넷째, 자원봉사활동을 경험하면서 체력적 한계, 능력과 기술의 부족 그리고 시간 부여가 어려웠다고 호소한다. 또한 노인들은 향후 지속적으로 자원봉사활동에 참여하고 싶다는 의지를 보이고 있지만 건강상태가 지속성에 가장 주요한 요소임을 밝히고 있다. 다섯째, 노인들의 약 2/3는 자원봉사활동을 하면서 금전적 보상을 받고 있지 않으나 향후 자원봉사활동에 대해서는 금전적 보상이 있기를 원하고 있다. 여섯째, 노인들은 향후 자원봉사활동의 분야로 비대면적인 측면보다는 대면적인 측면에서 참여하고 싶어 하면서도 지역사회를 위한 봉사차원의 환경정리, 나무심기 등의 비대면 자원봉사활동 역시 희망하고 있다. 따라서 제주지역 노인들의 자원봉사활동에 있어서 고소득층이며 남성인 60대 노인들의 적극적인 자원봉사활동 참여를 유도하기 위한 교육, 금전적 보상, 홍보, 정책개발 등의 방안을 모색해야 한다. 그리고 노인들의 욕구와 역량에 맞는 다양한 자원봉사활동 프로그램 개발과 함께 지역사회 주민들을 대상으로 노인 자원봉사활동에 대한 시민교육이 절실히 요구된다. This study attempts to investigate the existential aspects of the volunteer work of the aged in jeju. In addition, the data are based on questionnaire for the volunteer work of the aged in jeju. The results of this research is to find political strategies the fixed political system more flexible. in order to revitalization for the volunteer work of the aged in jeju. The following recommendations are made for the future of the volunteer work of the aged in jeju. (1) Active participation and enlargement of the subjects. (2) The strengthening of civic education and publicity for the volunteer work. (3) Increasing assistance of monetary compensation in the volunteer work of the aged. (4) Active participation and flexible reform of the political system. (5) Scientist s study activities for the future of the volunteer work of the aged in jeju.

저온연소조건에서 급속압축기를 이용한 n-heptane/n-butanol 혼합연료의 착화지연에 관한 연구

송재혁(Jae Hyeok Song),강기중(Ki Joong Kang),Zheng Yang,XingCai Lu,최경민(Gyung Min Choi),김덕줄(Duck Jool Kim) 한국연소학회 2013 한국연소학회지 Vol.18 No.2

This study presents both experimental and numerical investigation of ignition delay time of n-heptane and n-butanol binary fuel. The O2 concentration in the mixture was set to 9-10% to make high exhaust gas recirculation(EGR) rate condition which leads low NOx and soot emission. Experiments were performed using a rapid compression machine(RCM) at compressed pressure 20bar, several compressed temperature and three equivalence ratios(0.4, 1.0, 1.5). In addition, a numerical study on the ignition delay time was performed using CHEMKIN codes to validate experimental results and predict chemical species in the combustion process. The results showed that the ignition delay time increased with increasing the n-butanol fraction due to a decrease of oxidation of n-heptane at the low temperature. Moreover, all of the binary fuel mixtures showed the combustion characteristics of n-heptane such as cool flame mode at low temperature and negative-temperature-coefficient(NTC) behavior. Due to the effect of high EGR rate condition, the operating region is reduced at lean condition and the ignition delay time sharply increased compared with no EGR condition.

Differential expression of extracellular matrix and integrin genes in the <i>longissimus thoracis</i> between bulls and steers and their association with intramuscular fat contents

Park, Seung Ju,Kang, Hyeok Joong,Na, Sangweon,Lee, Seung Hwan,Baik, Myunggi Elsevier 2018 Meat science Vol.136 No.-

<P>This study was performed to compare expression of genes for extracellular matrix (ECM) components, ECM degrading factors, and integrin subunits in the longissimus thoracis (LT) between bulls and steers. Steers had lower (P < 0.05) ECM component collagen type 1 alpha 1 and collagen type 3 alpha 1 mRNA levels than did bulls, but they had higher (P < 0.05) thrombospondin 1 mRNA and protein levels. Steers had higher (P < 0.01) matrix metalloproteinase (MMP) 9 mRNA levels than did bulls. Steers had higher (P < 0.05) integrin alpha 5 mRNA levels but lower (P < 0.05) integrin beta 6 mRNA and protein levels; however, expression levels of several other integrin subunits were not different between steers and bulls. MMP9 mRNA levels were positively correlated (P < 0.05) with intramuscular fat content in bull group. In conclusion, these results demonstrate that castration has moderate effects on expression of ECM components, ECM degrading factors, and integrin subunit genes in the LT.</P>

A prospective comparison of single-port versus conventional laparoscopic surgery for ectopic pregnancy

( Min Kyung Kim ),( Jun Hyeok Kang ),( Ji Ye Kim ),( Jung Hwa Ko ),( Joong Sub Choi ),( Jung Hun Lee ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-

Single port laparoscopic surgery has been utilized in various gynecologic fields according to the development of laparoscopic equipment and techniques and the increasing demand for minimally invasive surgery. Although several studies of SP-LS for ectopic pregnancy have been reported, most of these studies were performed only in hemodynamically stable women with tubal pregnancy and excluded other types of ectopic pregnancy. The clinical usefulness of these prior studies is limited because of the difficulty in differentiating the type of ectopic pregnancy and the considerable rate of hemodynamic instability observed in this population. To obtain more clinically relevant data, we evaluated the feasibility and safety of SP-LS for ectopic pregnancy regardless of the hemodynamic stability and the type of ectopic pregnancy A prospective case-control study of total 106 women who underwent SP-LS or conventional LS for a suspected ectopic pregnancy was performed at a University teaching hospital from January 2009 to March 2012. 26 women underwent SP-LS and 80 women underwent conventional LS. There were no statistical differences between the groups in terms of demographic characteristics, operating time, postoperative hemoglobin change, return of bowel activity, hospital stay, or complication rate. There were no cases of additional trocar use or conversion to laparotomy. Of five women with heterotopic pregnancy, one underwent SP-LS, and three underwent conventional LS for tubal pregnancy, which all resulted in vaginal delivery without obstetrical complication; one woman received SP-LS for cornual pregnancy and had an ongoing pregnancy. SP-LS for ectopic pregnancy is feasible and safe in women with regardless of the type of ectopic pregnancy and hemodynamic stability. However, further work is needed to confirm this conclusion and to demonstrate any advantage of SP-LS for ectopic pregnancy.

Impact of intervals between secondary cytoreductive surgery and adjuvant chemotherapy in patients recurrent epithelial ovarian cancer

( Soo Young Jeong ),( Jun Hyeok Kang ),( Myeong Seon Kim ),( E Sun Paik ),( Chel Hun Choi ),( Tae Joong Kim ),( Jeong Won Lee ),( Byoung Gie Kim ),( Duk Soo Bae ),( Yoo Young Lee ) 대한산부인과학회 2019 대한산부인과학회 학술대회 Vol.105 No.-

Objective: When epithelial ovarian cancer(EOC) patients recur, secondary cytoreductive surgery(SCS) and adjuvant chemoteherapy(AC) are performed in selected patients. This study was performed to identify the impact of intervals between SCS and AC in recurrent EOC patients. Methods: Recurrent EOC patients performed SCS and AC from January 2002 to December 2015 were enrolled in this retrospective study. The treatment interval(TI) was defined as the period between SCS date and initiation date of AC. Overall survival(OS) and progression-free survival(PFS) were calculated by the Kaplan-Meier method. Univariate and multivariate analyses were used to evaluate the association of demographic and clinical variables with OS in Cox-proportional hazard models. Results: A total of 79 patients met the inclusion criteria. We divided into two groups according to the median level of TI, 10 days(range, 4-42). Each group was included 42(53.1%) and 37(46.9%) patients. Two groups were similar in clinical and pathological characteristics. The TI was not a significant prognostic factor for recurrence and death in recurrent EOC (HR for PFS 0.67, p=0.670, HR for OS 0.772, p=0.433). However, CA-125 level before SCS, residual status after SCS, and platinum-free interval were significantly prognostic factors of recurrence and death in patients with SCS and AC. (HRs for PFS were 1.976, 2.366, and 0.509, HRs for OS were 2.664, 3.699, and 0.462, all p-value<0.05). Survival rates were improved when disease were resected completely at SCS, when CA-125 level before SCS was lower, when platinum-free interval was longer, and when surgery type was laparoscopic (all p-value<0.05). However, the TI was not related with survival rates(p=0.431). Conclusion: In this study, when SCS and AC were performed in recurrent EOC patients, the TI was not related with survival and the most powerful prognostic factor was ‘complete resection at SCS’. Larger cohort study will need to confirm the impact of TI.