이종폴리머 접합을 위한 레이저 에너지 최적제어 기법

송치훈,최해운,Song, Chi Hun,Choi, Hae Woon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2

Dual laser heat sources were used for polymer based material joining. An infrared camera and thermocouple DAQ system were used to correlate the temperature distribution to computer simulation. A 50 degree tilted pre-heating laser source was acting as a heating source to promote the temperature to minimize thermal shock by the following a welding heat source. Based on the experimental result, the skin depth was empirically estimated for computer simulation. The offsets of 3mm, 5mm and 10mm split by weld and preheat were effectively used to control the temperature distribution for the optimal laser joining process. The closer offset resulted in an excessive melting or burning caused by sudden temperature rising. The laser power was split by 50%, 75% and 100% of the weld power, and the best results were found at 50% of preheating. To accurately simulate the physical laser beam absorption and joining optical properties were experimentally measured for the computer FEM simulation. The simulation results showed close correlation between theoretical and experimental results. The developed dual laser process is expected to increase productivity and minimize the cost for the final products.

산전 진찰 시 발견된 태아 난소 낭종 1 례

송치훈(Chi Hun Song),홍서유(Seo Yoo Hong),정수미(Soo Mi Chung),한경철(Kyung Chul Han),박철범(Chul Bum Park),신봉규(Bong Gyu Shin) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.3

Ovarian cysts in the newborn are uncormnon. Fetal ovarian cysts are being diagnosed with inaeasing fiequency with development of obstetrical sonography. Most of these cysts are found within the first few months of life and have no clinical significance. But, a large ovarian cyst would be founded antenatally with sonography. A large ovarian cyst can cause life-theatening complications during parturition and in the neonatal period. We have experienced a case of fetal ovarian cyst in a 32-year-old primiparous woman with antenatal sonography and report our experience with a brief review of literatures.

임신 34주에 진단된 전이성 융모 상피암 1 예

송치훈(Chi Hun Song),정수미(Su Mi Jung),양원규(Won Gyu Yang),박종호(Jong Ho Park),박원일(Won Il Park),신정환(Jung Whan Shin),주종은(Jong Eun Joo) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.1

Choriocarcinoma associated with a normal pregnancy is rare. Especially, choriocarcinoma coexistent with a viable pregnancy is even rarer and commonly presents with widespread metastatic disease. We experienced a patient at 34th week of pregnancy with dyspnea and sputum production due to pulmonary metastasis of choriocarcinoma. The serum B-hCG level was extremely elevated and the placenta had multifocal choriocarcinoma. After vaginal delivery, the patient was successfully treated with combination chemotherapy (EMA-CO). The patient is receiving follow up with monthly measurement of hCG values. We report one case of metastatic choriocarcinoma with viable pregnancy with review of literature.

Trans-obturator tape로 치료한 복압성요실금 80예에 관한 임상적 고찰

송치훈 ( Chi Hun Song ),손영제 ( Young Je Son ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.6

목적: 여성의 복압성 요실금에 대한 치료에 다양한 수술적 방법이 이용되고 있다. 저자는 Trans-obturator tape (TOT)를 이용하여 치료한 환자들을 대상으로 TOT의 안정성과 효용성을 평가하고자 한다. 연구 방법: 2004년 8월부터 2005년 9월까지 복압성 요실금 (순수 혹은 복합성)을 가진 여자 환자들 중 TOT를 이용하여 치료하고 3개월 이상 추적 관찰한 80명을 대상으로 치료 결과 및 예후를 임상적으로 분석하였다. 결과: 환자의 연령분포는 28세에서 74세였고, 평균연령은 42.8세였다. 전체 환자 중 복압성 요실금은 74명 (92.5%)에서 완전 회복이 되었고 4명 (5%)에서 부분회복이 되었으며 2명 (2.5%)에서는 효과가 없었다. 복합성 요실금 환자에서 절박뇨는 36명 중 30명 (83.3%)에서 호전되었고 빈뇨는 27명 중 20명 (62.9%)에서 호전되었다. 평균 수술시간은 14.3±3.8분이었고, 입원에서 퇴원까지의 시간은 평균 6±2.4시간이었다. 수술 후 창상출혈이 한 명에서 나타났고 수술 중 방광천공이 의심된 환자가 한 명 발생하였다. 수술 전에 없었던 절박뇨가 1명 나타났고 빈뇨가 세 명에서 나타났으나 일시적이었고 두 명은 요속이 약해졌다고 호소하였지만 치료가 필요한 정도는 아니었다. 결론: TOT를 이용한 수술은 복압성 요실금 치료에 있어서 안전하고 효과적인 방법이고 절박뇨나 빈뇨에도 효과가 있어 복합성 요실금의 1차적인 치료방법으로서 외래에서 쉽게 시술할 수 있는 수술 방법의 하나로 생각된다. Objective: This study was performed to evaluate the efficacy and safety of Trans-obturator tape (TOT) in the surgical treatment of stress incontinence and analyze the postoperative clinical outcome. Methods: Between August 2004 and September 2005, females diagnosed as having stress incontinence (pure or mixed) were operated on using TOT. Eighty cases with more than three-month follow-up period were included for this study. Results: Patient age ranged from 28 to 74 years (mean, 58). After surgical treatment using TOT, 74 cases (92.5%) of stress incontinence showed complete recovery, 4 cases (5%) showed partial recovery, and 2 cases (2.5%) were unchanged without further functional deterioration. Urgency in the mixed incontinence was improved in 30 in 36 cases (83.3%) and frequency was changed for the better in 20 of 27 cases (62.9%). The mean operation time was 14.3 minutes and the mean hospital stay was six hours. Postoperative evaluation with cystoscope was unnecessary. The postoperative complication rate was 10% (8/80). Postoperative wound bleeding occurred in one case and intraoperative bladder perforation happened in one case. Postoperative transient urgency was developed in one case and postoperative transient frequency developed in three cases. Two patients complained of weak urinary stream. Conclusion: The surgical treatment using TOT is thought to be a safe and efficient means for the outpatient management of stress incontinence. And also, this method appears to have an effect on urgency and frequency.

국방품질연구회(DQS) 전문가를 활용한 SW 제도·정책업무 개선

권경용,송치훈,박병훈,오진우,Gwon, Gyeong-Yong,Song, Chi-Hun,Park, Byeong-Hun,O, Jin-U 한국정보과학회 2017 정보과학회지 Vol.35 No.12

3차 등매개 유한요소를 이용한 이종재료 접합면에 수직인 균열의 응력확대계수 평가

임원균,정규철,송치훈,Lim, Won-Gyun,Jeong, Gyu-Cheol,Song, Chi-Hun 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.1

When a crack meets bimaterial interface stress singularity depends on the elastic constants of the adjacent materials. In the present study we are going to describe the finite element formulation for problems with a crack to be embedded in the stiffer material$({\mu}_2/{\mu}_1)$. The cubic isoparametric singular element, represented by adequately shifting the mid-side nodes adjacent to the crack tip is constructed to enclose the crack tip. An alternative method to obtain the optimal position of the mid-side nodes of cubic isoparametric elements is presented. In addition, a proper definition for the stress intensity factors of a crack normal to bimaterial interface is provided. It is based upon near a tip displacement solutions. Models for numerical analysis are two dimensional elastic bodies with a through crack under plain strain. The results obtained are compared with the previous solutions.

자궁경관무력증의 임상적 고찰

양윤석(Yun Seok Yang),송치훈(Chi Hun Song),박종호(Jong Ho Park),신정환(Jung Whan Shin),홍서유(Seo Yoo Hong),박미혜(Mi Hye Park),김경진(Kyeng Jin Kim),황인택(In Taek Hwang),정지학(Ji Hak Jung),박준숙(Jun Sook Park) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.2

N/A Objective:Our goal was to evaluate the clinical characteristics and statistical analysis in incompetent internal os of the cervix(IIOC) Method: At Department of Obstetrics and Gynecology, Eulgi Hospital and Eulgi university Hospital from January 1, 1991 to December 31, 1997, 296 cases of IIOC were admitted and treated with McDonald operation or modified Shirodkar operation. Of this, 38cases were follow up lost, so 252 cases were analayzed. Diagnostic criteria was previous history of painless cervical dilatation, followed by spontaneous abortion or preterm birth, and acceptance without resistance at the internal os of No. 8 Hegar dilator. Result: Incidence of IIOC was 1.61%, 1 in 60 deliveries. Most frequent age group was in 28-30 years old group and mean age was 30 years old. Total number and mean number of gravida was 818 and 3.2. The most common contributing factor was previous artificial abortion(77%), and cervix dilatation(9%), old cervical laceration(4.3%) etc, was followed. Operation methods were McDonald operation(56%) and modified Shirodkar operation(44%). The Success rate of McDonald and modified Shirodkar was 78.1% and 88.1%. Successful fetal salvage rate was 82.5%, and the highest success rate was 86.9% in 14-18th weeks of gestation group. The more cervix dilate, the more failure occured. Causes of operation failure was premature rupture of membrane(54.5%), preterm labor(43.2%) and fetal death in utero(2.3%). Delivery method after operation was vaginal delivery(146cases, 70.9%) and cesarean delivery(60cases, 29.1%). Cause of cesarean delivery was previous cesarean section(43.3%), breech presentation(16.7%), cephalopelvic disproportion(15%), prolonged labor(6.7%), fetal disttess(6.7%), twin(5%), placenta previa(3,3%) and abruptio placenta(3.3%). Conclusion: The 14-18th weeks of gestation group & no cervical dilatation group has higher success rate, which indicate early diagnosis and appropriate timing of operation is probably associated with a greater operation

흰줄숲모기에 대한 모기기피제의 효과비교

강신호,장선아,한종빈,서동규,송치훈,김민기,김영림,최선희,김인규,김길하,Kang, Shin-Ho,Jang, Sun-Ah,Han, Jong-Been,Seo, Dong-Kyu,Song, Chi-Hun,Kim, Min-Ki,Kim, Young-Lim,Choi, Seon-Hee,Kim, In-Kyu,Kim, Gil-Hah 한국응용곤충학회 2005 한국응용곤충학회지 Vol.44 No.3

모기기피제로 사용되고 있는 에어로졸제 4개, 액제 3개, 그리고 로션제 1개 제품에 대하여 흰줄숲모기(Aedes albopictus)와 빨간집모기(Culex pipiens pallens)의 기피력을 조사하고, 기피 주성분인 DEET의 함량을 분석하였다. 쥐를 대상으로 했을 때 흰줄숲모기는 빨간집모기에 비해 흡혈 공격력이 높았으며, 흡혈 대상으로는 쥐(mouse)보다 사람의 손을 더 선호하였다. 쥐를 이용한 모기기피제의 기피력 평가에서, C 제품, G 제품, H 제품이 높은 기피력을 나타냈다. 이들 기피제를 사람 손을 흡혈대상으로 평가한 결과, 3개 약제 모두 2시간 동안은 100%의 기피효과를 나타내었으나 그 이후는 떨어줬으며, C 제품이 효과가 좋았다. GC를 통한 DEET의 분석에서 8종 모기기피제의 내용물 100 g 중량 내 7.31 g에서 38.9 g으로 제품 내 다양한 함량을 나타내었으며, 제품 내 처리된 DEET의 함량과 기피력의 상관관계는 정비례하지 않았다. 면포를 이용한 DEET 잔존량 대비 모기 기피력 평가에서 DEET의 함량이 약 40% 이하로 떨어지면서 흰줄숲모기의 흡혈이 이루어지기 시작했다. We investigated the repellency of eight mosquito repellents against Culex pipiens pallens and Aedes albopictus, and the quantity of DEETs were analysed by using gas chromatography. Ae. albopictus showed higher bloodsucking efficacy than Cx. pipiens pallens of the two subjects mouse and human hands, and human hand was more efficacious method for mosquito bloodsucking efficacy than mouse. Among the eight repellents were tested with mouse as subjects for eight hours, product C, G, and H were high repellency than others. In the case of human hands as subject, product C was highly effective than above other products. The DEET quantities of eight repellants varied from 7.31 g to 38.9 g in 100 g contents and we ascertained that there was a correlation between mosquito repellency and the DEET quantities remained after the treatments. It was evidenced from the long term test with shirt piece, in this test the Ae. albopictus attack was increased when the DEET quantity decreased below 40%.

흰줄숲모기에 대한 기피제의 지속성 평가

강신호,장선아,한종빈,서동규,송치훈,김민기,김영림,최선희,김인규,김길하,Kang, Shin-Ho,Jang, Sun-Ah,Han, Jong-Been,Seo, Dong-Kyu,Song, Chi-Hun,Kim, Min-Ki,Kim, Young-Lim,Choi, Seon-Hee,Kim, In-Kyu,Kim, Gil-Hah 한국응용곤충학회 2005 한국응용곤충학회지 Vol.44 No.4

본 연구는 장기간 지속효과가 강조된 미국 T사의 C제품(에어로졸)과 D제품(로션) 대비 국내5사의 A 제품(에어로졸)과 B 제품(액제)에 대하여, 사람 손에 처리 시 흰줄숲모기(Aedes albopictus)의 기피지속성에 대한 생물검정을 평가하고 시간 경과에 따른 기피 주성분인 DEET의 잔존량을 분석하였다 기피제 처리 후 8시간 조사에서 A제품은 8시간까지 95%의 기피효과를 나타냈으며, B제품, C 제품, D 제품은 각각 5, 6, 6시간까지 기피효과를 보였다. 그리고 면포를 이용한 16일까지의 장기간 지속성 평가에서, A 제품과 C 제품은 각각 10일까지 100%의 기피 지속성을 나타냈고, 시간 경과에 따른 기피 주성분인 DEET의 잔존량 분석에서도 동일한 양상으로 감소하였다. Four mosquito repellents, product A (aerosol), product B (liquid), product C (aerosol) and product D (lotion) were tested for their persistent repellency and quantity of DEET remained with the lapse was analyzed. In shirt term test with human (or 8 hours, product A (aerosol), product B (liquid), product C (aerosol) and product D (lotion) appeared over 95% repellency for eight, five, six and six hours. respectively. In long-term tests with shirt piece for 16 days, product A (aerosol) and product C (aerosol) showed 100% repellency for 10 days. In the assay of quantity of DEET remained in shirt pieces with the lapse of time, two products was decreased to the same pattern.

국방품질연구회(DQS) 전문가를 활용한 SW 제도・정책업무 개선

권경용(Kyeong-Yong Kwon),송치훈(Chi-Hoon Song),박병훈(Byeong-Hun Park),오진우(Jin-Woo Oh) 한국정보과학회 2017 정보과학회지 Vol.35 No.12