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( Jae-chun Kim ),( Young-bae Jeon ),( Hae-na You Park ),( Ji-hoo Kim ),( Myeong Woo Kim ) 한국고무학회 2018 엘라스토머 및 콤포지트 Vol.53 No.3
In this study, research was conducted into the manufacture of thermally expandable microspheres for automotive underbody coatings and applications in industry. In particular, the relationship between heat resistance and the ratio of crosslinking agents and initiators in the manufacture of the thermally expandable microspheres was investigated. We focused on the results with various cross-linking agents; our aim was to make the walls of the microspheres thicker to solve the problem of reductions in size caused by shrinkage when the microspheres are heated to T <sub>m</sub> (T <sub>max</sub>). We observed the sectional thickness and surface of the samples with thicker walls. The thick thermally expandable microspheres showed reduced shrinkage and excellent stability in spite of prolonged exposure to heat.
Factors Associated with Removal of Impactted Fishbone in Children, Suspected Ingestion
Lim, Chun Woo,Park, Min Hwan,Do, Hyun Jeong,Yeom, Jung-Sook,Park, Ji Sook,Park, Eun Sil,Seo, Ji Hyun,Park, Jung Je,Lim, Jae Young,Park, Chan Hoo,Woo, Hyang-Ok,Youn, Hee-Shang The Korean Society of Pediatric Gastroenterology 2016 Pediatric gastroenterology, hepatology & nutrition Vol.19 No.3
Purpose: The management and clinical course in pediatric patients who had ingested foreign body were investigated retrospectively to evaluate the frequency and factor associated with successful removal of fishbone foreign body. Methods: Based on the medical records of patients younger than 15 years old who visited emergency room because of foreign body ingestion from January 1999 to December 2012, the authors reviewed clinical characteristics including type of ingested foreign bodies, time to visits, managements and complications. Results: Fishbone (50.1%) was the most common ingested foreign body in children. Among 416 patients with ingested fishbone, 245 (58.9%) were identified and removed using laryngoscope, rigid or flexible endoscope from pharynx or upper esophagus by otolaryngologists and pediatric gastroenterologists. The kind of ingested fish bone in children was diverse. The mean age of identified and removed fishbone group was 7.39 years old, and higher than that of unidentified fishbone group (5.81 years old, p<0.001). Identified and removed fishbone group had shorter time until hospital visit than the unidentified fishbone group (2.03 vs. 6.47 hours, p<0.001). No complication due to ingested fishbone or procedure occurred. Conclusion: Older age and shorter time from accident to hospital visit were the different factors between success and failure on removal of ingested fish bone in children.
0.5% 고비중 Bupivacaine 과 Tetracaine을 사용한 척추 마취의 비교
이후전,류지한,심규호,전병돈,이신우,태일산 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.32 No.1
Several methods for the management of intractable pain for various conditions including malignant disorders, herpes zoster, and low back pain and/or sciatica in 80 patients were described and analyzed. Neurolytic blocks of celiac plexus were given to the patients suffering from intra-abdominal pain from malignant origin or chronic pancreatitis. Herpes zoster was treated mainly by chemical sympathectomy via paravertebral route and occassionaly corticosteroid was administered epidurally with the local anesthetic, bupivacaine. All the patients with low back pain and/or sciatica were given epidural corticosteroid one to three times. Other peripheral verve blocks and regional corticosteroid therapy were given to the rest of the patients. Fair to excellent result was obtainde in 71% of the patients but the response was poor in the remaining 28% of the patients. It seems that earlier the patients were referred to the pain clinic, the better the results were.
Woo, Jang Chun,Bae, Woong Jin,Kim, Su Jin,Kim, Sung Dae,Sohn, Dong Wan,Hong, Sung Hoo,Lee, Ji Youl,Hwang, Tae-Kon,Sung, Young Chul,Kim, Sae Woong 대한비뇨기과학회 2011 Investigative and Clinical Urology Vol.52 No.5
<P><B>Purpose</B></P><P>Muscle-derived stem cells (MDSCs) harvested from skeletal muscles have the advantage of providing easier access and do not pose the immunogenic risks of embryonic stem cells. We investigated the effect of intracavernosal transplantation of MDSCs on erectile function in rats with bilateral cavernous nerve injury.</P><P><B>Materials and Methods</B></P><P>Adult male white rats underwent experimentation in 3 groups: group I, sham operation; group II, bilateral cavernous nerve injury; group III, bilateral cavernous nerve injury with MDSC injection. MDSCs were harvested from the femoral muscle of rats and were then injected into the cavernosum. Survival of MDSCs and measurement of erectile function was studied after 4 weeks. We checked the intracavernosal pressure (ICP) and obtained penile tissue. The expression of cyclic guanosine monophosphate (cGMP) was analyzed.</P><P><B>Results</B></P><P>Four weeks after transplantation, PKH-26-labeled MDSCs were identified in the cavernosal tissues of group III. Peak ICP and the drop rate of group II were 52±8.7 mmHg and 34±6.5 mmHg/min, respectively, whereas peak ICP and the drop rate of group III were 97±15.6 mmHg and 17±4.9 mmHg/min, respectively, showing that erectile function improved after MDSC transplantation (p<0.05). The expression of cGMP was significantly lower in group II (21.9±5.8 fmol/well) than in group I and group III (70.2±10.3 and 58.9±10.5 fmol/well, respectively).</P><P><B>Conclusions</B></P><P>In a cavernous nerve injury rat model, intracavernosal transplantation of MDSCs showed acceptable survival of MDSCs as well as improvement of erectile function.</P>
비교사적 군집화 알고리즘을 이용한 전산화 단층영상의 병소부위 결정에 관한 연구
이경후,지영훈,이동한,류성렬,조철구,김미숙,유형준,권수일,전준철 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.2
정위적분할방사선치료(FSRT)는 병소경계에 대한 공간상위치와 형태를 정확히 결정하는 것이 큰 쟁점이다. 본 연구는 나선형 CT를 이용하여 4명의 뇌종양 환자와 팬톰(파라핀)으로부터 연속적인 횡축 단면상을 얻었다. K-mean분류 알고리즘을 적용하여 CT영상의 초기정보값을 평균화소값으로 변화시켰다. 영상의 구성은 병소영역, 정상영역, 혼합영역, 바탕영역, 가음영영역의 5영역으로 분류하였다. 주된 관심은 혼합영역 내에서 정상영역과 혼합영역을 어떻게 분리하는 가였다. 5영역 평균화소값 중에서 정상영역과 병소영역에 상대적인 평균편차 분석법을 적용하여 2영역 평균편차 화소값 사이의 최대점을 구하였다. IDL 프로그램을 이용한 반자동윤곽법으로 혼합영역내의 최대점을 연결함으로서 GTV의 경계선을 그렸다. 균일한 팬톰의 관심영역 경계선은 ±1% 이내의 오차로 평가되었다. 환자 4명의 경우는 방사선 전문의들이 그런 병소영역과 K-mean 알고리즘과 상대적인 평균편차 분석법에 의해 자동적으로 묘사된 병소영역과 거의 일치하였다. 이러한 방법들을 사용하여 불분명한 정상영역과 병소영역의 경계선을 명확하게 나타낼 수 있었다. 그러므로 CT 영상이 MRI 영상과 비교하여 간헐적으로 병소윤곽을 보여주지 못할 경우 이 방법은 치료계획을 결정할 때 유용한 CT영상 자료로 활용될 수 있음을 확인하였다. It is a hot issue to determine the spatial location and share of tumor boundary in fractionated stereotaotic radiotherapy(FSRT). We could get consecutive transaxial plane images from the phantom(paraffin) and 4 patients with brain tumor using helical computed tomography(HCT). K-means classification alogrithm was adjusted to change raw data pixel value in CT images into classified average pixel value. The classified images ocnsists of 5 regions that are tumor region(TR), normal region (NR), combination region(CR), uncommitted region(UR) and artifact region(AR). The major concern was how to separate the normal region from tumor region in the combination area. Relative average deviation analysis was adjusted to alter average pixel values of 5 regions into 2 regions of normal and tumor region to define maximum point among average deviation pixel values. And then we drawn gross tumor volume(GTV) boundary by connecting maximum points in images using semi-automatic contour method by IDL(Interactive Data Language) program. The error limit of the ROI boundary in homogeneous phantom is extimated within ±1%. In case of 4 patients, we could confirm that the tumor lesions described by physician and the lesions described automatically by the K-mean classification algorithm and relative average deviation analyses were similar. These methods can make uncertain boundary between normal and tumor region into clear boundary. Therefore it will be useful in the CT images-based treatment planning expecially to use above procedure apply prescribed method when CT images intermittently fail to visualize tumor volume comparing to MRI images.
정민지 ( Min Ji Chung ),구태본 ( Tae Bon Koo ),이택후 ( Taek Hoo Lee ),전상식 ( Sang Sik Chun ),이윤순 ( Yoon Soon Lee ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.3
Endometriosis is a relatively common disease, affecting 5-10% of women of reproductive age. But, endometriosis affecting the urinary tract is very rare entity. Involvement of urinary tract by endometriosis occurs in about 1% of women with pelvic endometriosis. Ureteral endometriosis is mostly asymptomatic for a long time, and associated with nonspecific symptoms at clinical presentation and difficult preoperative diagnosis. The involvement of the ureter is rarely intrinsic by implantation of endometrial tissue in the wall of the ureter, but rather due to external compression by adjacent endometriosis and its attendant inflammation and fibrosis. We have experienced a case of right severe hydroureteronephrosis due to ureteral stricture from endometriosis. Laparoscopic nephrectomy was done due to renal atrophy. At the same time, laparoscopic total hysterectomy with right salpingo-oophorectomy was performed because of the uterine adenomyosis and right ovarian endometrioma. So, we report that with a brief review of literatures.