저장용액의 온도에 따른 치주인대세포의 생존율

조재현,김성오,최형준,이제호,손흥규,최병재 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.1

외상성 손상 후 치아 탈구 시 치아를 저장하는 저장용액의 종류와 온도가 치주인대세포의 생존율에 어떠한 영향을 미치는지 연구하기 위하여 치주인대세포를 10% fetus bovine serum(FBD) 함유 α-minimal essential medium(α-MEM)에서 37℃ 5% CO_(2) 공기 혼합 배양기에서 배양하고 4.25, 37℃의 Hank's balanced sa1t solution(HBSS)과 α-MEM, 우유(S회사, P회사), tap water에 저장하고 60분이 지난 후 각 군에 대해 치주인대세포의 생존율을 측정하기 위하여 MTT assay를 시행하여 다음과 같은 결과를 얻었다. 1. 4℃ 저장용액의 치주인대세포의 생존율은 α-MEM과 P회사우유에서 가장 높았고 HBSS, S회사우유, tap water 순으로 낮았다. 2. 25℃ 저장용액의 치주인대세포의 생존율은 α-MEM에서 가장 높았고 P회사우유, HBSS, S회사우유, tap water 순으로 낮았다. 3. 37℃ 저장용액의 치주인대세포의 생존율은 α-MEM과 P회사우유, HDSS, S회사우유에서 높았고 tap water에서 가장 낮았다. 4. α-MEM의 치주인대세포의 생존율은 4℃에서 가장 높았고 25℃와 37℃ 순으로 낮았으며 HBSS에서는 4℃에서 높았고 25℃와 37℃에서 낮았다. 5. S회사와 P회사우유에서 치주인대세포의 생존율은 4℃와 25℃에서 높았고 37℃에서 낮았다. 이상의 결과를 종합해볼 때 외상으로 인해 치아가 탈구되었을 때 탈구된 치아의 저장용액으로 HBSS 용액이 추천되고 있으나 이 연구에서 4℃와 25℃ 우유에서 치주인대세포의 생존율이 높았으므로 사고 현장에서 쉽게 구할 수 있고 치주인대세포의 생활력 보존에도 유리한 낮은 온도의 우유에 탈구된 치아를 보존하는 방법도 좋을 것으로 생각된다. To compare the survival rate of periodontal ligament cells preserved in storage media with good availability at the time of an avulsion injury, periodontal ligament cells were incubated in α-MEM culture medium containing 10% FBS in condition of 37℃, 5% CO_(2). These cells were then cultured in HBSS, α-MEM, milk(S. co., P. co.) and tap water at the temperature of 4, 25, 37℃ each in 60 min. The groups were measured by MTT assay. The results were as follows : 1. Among the storage media at 4℃, α-MEM and P-milk had the highest preserving ability of periodontal ligament cells, while that of HBSS, S-milk and tap was low in order. 2. Among the storage media at 25℃, α-MEM had the highest preserving ability of periodontal ligament cells, while that of P-milk, HBSS, S-milk, tap water was low in order. 3. Among the storage media at 37℃, the preserving ability of periodontal ligament cells was very high in α-MEM, P-milk, HBSS and S-milk. it' s lowest in tap water. 4. The preserving ability of periodontal ligament cells in α-MEM was high at 4℃ and it’s low in order of 25℃, 37℃, but in HBSS was high at 4℃ and it's low at 25℃, 37℃. 5. The preserving ability of periodontal ligament cells in S-milk and P-milk was high at 4℃, 25℃ and it’s low at 37℃. In conclusion, HBSS is the storage medium of choice in an avulsion, but in this study it is preferable to choose milk at 4℃ for tooth since it is easy to get and affect cell viability.

WMT를 이용한 인터넷 방송국 구축

김홍식,이영진,조재영,주영훈,박주연,송선아 인제대학교 기초과학연구소 2000 자연과학 Vol.4 No.-

WMT(Windosw Media Technologies)는 Microsoft에서 만든 인터넷 또는 인트라넷상에서 고품질의 오디오/비디오를 실시간으로 전송하여 주는 멀티미디어 스트리밍 기술이다. WMT는 대부분의 로컬 및 스트리밍 멀티미디어 파일 형식을 지원하기 때문에 개발자들은 어떤 웹 어플리케이션이나 사이트에라도 오디오와 비디오 방송을 구축할 수 있다. WMT에 포함된 Windows Media Encoder, Windows Media On Demand Producer등을 이용하고 전용서버를 설치하여 on-Demand방송이나 실시간 인터넷 방송을 구축할 수 있다. WMT is the multimedia streaming technology which transfer the audio and video on Internet or Intranet. Because WMT supports almost styles of local and streaming multimedia file, some developers build the radio and video broadcasting system at any web applications and sites. This paper shows the method of develop the realtime internet broadcastion system with WMT.

TDI계 수분산성 폴리우레탄 접착제의 특성에 Diisocyanate의 구조가 미치는 영향

강승구,송봉근,이재흥,박찬조,류해일 한국공업화학회 2003 공업화학 Vol.14 No.3

수년 전부터 많은 연구자들에 의해 폴리우레탄의 수용화, 수분산화의 연구가 수행되어 왔다. 그럼에도 불구하고 폴리우레탄의 특성에 디이소시아네이트가 구조에 미치는 영향에 대한 연구는 많이 진행되지 않았고 또한 미흡한 상태이다. 따라서 번 연구에서는 디이소시아네이트의 형태와 함량 변화에 따른 폴리우레탄의 특성을 연구하였다. 폴리우레1탄 수분산체(PUD)는 poly(tetramethylent ether) glycol (PTMG), isophorone diisocyanate (IPDI), toluene 2,4-diisocyanate (TDI), dimethylol propionic acid (DMPA), trethylamine (TEA) 등을 사용하여 제조하였다. 제조한 폴리우레탄 수분산체(PUD)의 구조를 FT-IR을 이용하여 확인하였다. 폴리우레탄 수분산체의 특성은 DSC, gel permeation chromatography (GPC), particle analyzer, universal testing machine (UTM) 등을 사용하여 측정하였다. 폴리우레탄 수분산체(PHD)에서 입자크기는 IPDI 함량이 증가할수록 작아지는 경향을 나타내었으며, 유리전이온도(Tg)는 IPDI 함량이 증가할수록 조금씩 낮아지는 경향을 나타내었다. 또한, 폴리우레탄 수분산체(PUD)의 접착세기 변화에서는 [NCO]/[OH] 몰비를 1.2로 유지되도록 하면서 합성에 관여하는 [NCO] 양에 해당하는 [TDI]/[IPDI] 몰비를 변화시켜 얻은 폴리우레탄 수분산체의 접착세기는 [TDI][IPDI] 몰비가 50/50일때 좋은 집착세기를 나타내었다. 또한 [NCO]/[OH] 몰비를 1.6으로 일정하게 유지되도록 하고 [TDI]/[IPDI] 몰비를 변화시켜 얻은 폴리우레탄 수분산체의 접착세기는 [TDI]/[IPDI] 몰비가 75/25일 때 좋은 접착세기를 나타내었다. Aqueous polyurethane dispersions (PUD) has been investigated by many researchers for a long time. However, relatively little systematic work has been reported, in detail, on the effect of structure of the diisocyanate on the properties of polyurethane. This work describes the properties of polyurethane in relation to the variation of diisocyanate type and contents. Aqueous polyurethane dispersions (PUD) were prepared from the poly(tetramethylene ether) glycol (PTMG), toluene 2,4-diisocyanate (TDI), isophorone diisocyanate (IPDI), dimethyol propionic acid (DMPA), and triethylamine (TEA). Differential scanning calorimetry (DSC), FT-IR, GPC, universal testing machine (UTM), and particle analyzer were utilized to characterize the physical and mechanical properties of PUD according to diisocyanate type and contents. As the content of IPDI in PUD increased, the particle size decreased. The glass transition temperatures (Tg) of PUT were shifted to a lower temperature as IPDI conent increased. When [NCO]/[OH] mole ratio was 1.2, the adhesion force of PUD shown the best result at [TDI]/[IPDI] mole ratio of 50/50. And, at [NCO]/[OH] mole ratio of 1.2, the adhesion force of PUD was the best when [TDIl/[IPDI] mole ratio was 75/25.

Poster Session : PS 1035 ; Others : Diagnostic Yield and Clinical Impact of Multidetector CT Angiography in Patients with Obscure astrointestinal Bleeding

( Jae Min Jo ),( Hyun Joo Song ),( Soon Jae Lee ),( Sun Jin Boo ),( Soo Young Na ),( Heung Up Kim ),( Seung Hyoung Kim ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Obscure gastrointestinal bleeding (OGIB) accounts for 5% of all gastrointestinal (GI) bleeding cases. Multidetector CT angiography (MDCTA) is not generally recommended in OGIB patients due to its low sensitivity. However, it can be used to quickly and simply diagnose OGIB according to some guidelines. The aim of this study was to evaluate the diagnostic yield and clinical impact of MDCTA in OGIB patients Methods: We retrospectively analyzed the medical records of 363 patients who underwent MDCTA between March 2009 and December 2013. A total of 46 patients were diagnosed as having OGIB, and their baseline characteristics and treatment outcomes were analyzed. The sensitivity, specifi city, and positive and negative predictive values of MDCTA for the detection of bleeding sites were assessed Results: The mean age of the patients was 59 ± 24 years. Melena was the most common symptom (39.1%). Positive MDCTA findings were observed in 8 patients. Of these 8 patients, bleeding occurred from the small bowel in 7 patients and from the colon in 1 patient. The sensitivity, specifi city, and positive and negative predictive values of MDCTA were 34.8% (8/23), 88.2% (15/17), 80.8% (8/10), and 41.7% (15/36), respectively. Thirty-three patients (71.7%) underwent conservative management, and 10 patients (21.7%) underwent specifi c treatment. Patients who showed true positivity in MDCTA tended to receive specifi c treatment rather than conservative management (62.5% vs 37.5%, p=0.10). Patients who underwent specifi c treatment and showed true positivity in MDCTA more frequently had recurrent bleeding (p=0.008). The mean follow-up period was 18.3 ± 16.9 months, and the total 8 patients (17.4%) had recurrent bleeding Conclusions: MDCTA showed a low sensitivity, a relatively high specifi city, and a positive predictive value for OGIB. MDCTA may be useful for identifying bleeding sites in OGIB patients.

SWMM을 이용한 황구지천유역의 비점원오염부하량 평가

조재현 ( Jo Jae Hyeon ),조남흥 ( Jo Nam Heung ) 한국환경영향평가학회 2003 환경영향평가 Vol.12 No.5

Water pollution of Hwanggujicheon stream is severe because urban area of Suwon City is included in the basin. A countermeasure for water quality prevention of the stream is necessary. In this study, nonpoint pollutant load of BOD, SS, TN and TI are estimated using SWMM. The result indicates that BOD, SS, TN and TI loads during 3 months from July to September are 67.0%, 60.8%0,54.7010 and 74.%0 of the annual total load, respectively. We can see that most of nonpoint pollutant loads are generated in the rainy season. Annual nonpoint pollutant loads of BOD, SS, TN and TI in the Hwanggujicheon stream are 342 ton, 1,500 ton, 480 ton and 12.6 ton, respectively.

원적외선용 반사식 전방위 비전 시스템의 광학 설계

주윤재(Yun Jae Ju),조재흥(Jae Heung Jo),유재명(Jae Myung Ryu) 한국광학회 2019 한국광학회지 Vol.30 No.2

야간 감시를 위해 원적외선에서 사용하는 4개의 구면 및 비구면 거울을 갖는 반사식 전방위 비전 시스템 광학계를 제안한다. 이 반사식 전방위 비전 시스템은 유사 카세그레인식 수광부 반사경 시스템과 역 유사 카세그레인식 결상부 반사경 시스템으로 설계되었으며, 그에 따른 설계 과정과 성능 분석을 상세히 제시한다. 이 비전 시스템의 반화각과 F-수는 각각 40~110°와 1.56으로 설정하였다. 그리고 원적외선 파장 영역에서 비전 시스템을 사용하기 위해서 상의 크기가 원적외선용 마이크로 볼로미터의 크기와 가능한 같아야 하므로 상의 크기를 5.9 mm × 5.9 mm에 맞추어 설계를 진행하였다. 최적화 설계 후 40~110°의 반화각 범위에서의 상 크기의 비율은 48.86%이며, 나이퀴스트 주파수인 20 lp/mm의 공간주파수에서 원적외선의 변조전달함수 값이 0.381에 도달하였다. 또한 20 lp/mm의 공간주파수에서 원적외선 영역에 대한 공차의 누적 확률은 99.75%였다. 또한 역 유사 카세그레인식 구조의 결상부 부경을 온도 변화에 따른 변조전달함수 값을 개선시키는 보상자로 선택하여 반사식 전방위 비전 시스템의 운용 온도 범위인 -32°C에서 +55°C의 온도 범위에서 비열화 해석 및 보상화 과정을 진행하였다. A reflecting omnidirectional optical system with four spherical and aspherical mirrors, for use with long-wavelength infrared light (LWIR) for night surveillance, is proposed. It is designed to include a collecting pseudo-Cassegrain reflector and an imaging inverse pseudo-Cassegrain reflector, and the design process and performance analysis is reported in detail. The half-field of view (HFOV) and F-number of this optical system are 40-110° and 1.56, respectively. To use the LWIR imaging, the size of the image must be similar to that of the microbolometer sensor for LWIR. As a result, the size of the image must be 5.9 mm × 5.9 mm if possible. The image size ratio for an HFOV range of 40° to 110° after optimizing the design is 48.86%. At a spatial frequency of 20 lp/mm when the HFOV is 110°, the modulation transfer function (MTF) for LWIR is 0.381. Additionally, the cumulative probability of tolerance for the LWIR at a spatial frequency of 20 lp/mm is 99.75%. As a result of athermalization analysis in the temperature range of -32°C to +55°C, we find that the secondary mirror of the inverse pseudo-Cassegrain reflector can function as a compensator, to alleviate MTF degradation with rising temperature.

Reference Ranges and Determinant Factors for Exhaled Nitric Oxide in a Healthy Korean Elderly Population

Jo, Eun-Jung,Song, Woo-Jung,Kim, Tae-Wan,Park, Heung-Woo,Chang, Yoon-Seok,Kim, Tae-Bum,Kim, Sang-Heon,Hur, Gyu-Young,Lee, Jae-Hyung,Yoon, Ho-Joo,Park, Hae-Sim,Cho, Nam-Ho,Moon, Hee-Bom,Min, Kyung-Up,C The Korean Academy of Asthma, Allergy and Clinical 2014 Allergy, Asthma & Immunology Research Vol.6 No.6

<P><B>Purpose</B></P><P>Exhaled nitric oxide (NO) is a useful non-invasive biomarker for asthma diagnosis; however, the literature suggests that exhaled NO levels may be affected by demographic factors. The present analysis investigated determinant factors that present exhaled NO reference levels for Korean elderly adults.</P><P><B>Methods</B></P><P>For reference levels, we analyzed the baseline data of healthy adult participants in the Ansung cohort. The fraction of exhaled NO (FeNO) was measured by NIOX MINO®. The characterization of the subjects was performed through structured questionnaires, spirometry, and methacholine challenge tests. To validate the diagnostic utility of the determined reference levels, asthma patients were recruited from medical institutions for FeNO measurement.</P><P><B>Results</B></P><P>A total of 570 healthy subjects were analyzed (mean age, 59.9±12.3; male, 37.0%) for reference levels. FeNO levels significantly correlated with weight, height, body mass index, atopy, or forced expiratory volume in 1 second % predicted by simple linear regression analysis. Multiple linear regression analysis identified gender as an independent determinant for FeNO levels; subsequently, the reference values for FeNO were 18.2±10.6 ppb (5th to 95th percentile, 6.0 to 37.4 ppb) for males and 12.1±6.9 ppb (5th to 95th percentile, 2.5 to 27.0 ppb) for females. The diagnostic utility of FeNO reference levels was validated by receiver operating curve analysis (area under curve, 0.900 for males and 0.885 for females) for diagnosing asthma. The optimal cutoff values for the prediction of asthma were 30.5 ppb for males and 20.5 ppb for females.</P><P><B>Conclusions</B></P><P>The current analysis presented reference ranges and the diagnostic utility of FeNO levels for asthma in Korean elderly adults.</P>

Mid-latitude leading double-dip La Nina

Jae-Heung Park,Jong-Seong Kug,Soon-Il An,Young-Min Yang,Hyun-Su Jo 한국기상학회 2020 한국기상학회 학술대회 논문집 Vol.2020 No.10

Two regimes of inter-basin interactions between the Atlantic and Pacific Oceans on interannual timescales

Jae-Heung Park,Jong-Seong Kug,Sang-Wook Yeh,Young-Min Yang,Hyun-Su Jo,Hyo-Jeong Kim,Soon-Il An 한국기상학회 2022 한국기상학회 학술대회 논문집 Vol.2022 No.10

A Study on the Manufacture of the Surrounding Outdoor Theater Noise Map and the Calculation of the Exposed Population

Heung-Sik Kim(김흥식),Soon-Hyeung Jo(조순형),Jae-Soon Jung(정재순),Se-Myung Wang(왕세명) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.10