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김천숙,박은정,강규식,김지은,안기량,권진형,유시현,주영철,권순정 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1
Background: The OR(operating room) should provide an optimum environment that is safe for the patient and the working personnel. The air ventilation system of OR has been studied to decrease the contamination of air. We investigated the flow and contamination of the air in OR at our hospital. Method: Cultures in OR were made and the number of bacteria and fungi were calculated. A two-dimensional model for the cross-section of an operation room is developed for the CFD (computational fluid dynamics) analysis. The characteristics of air flow in the empty operation room and in the occupied operation room are calculated by using a CFD program. Results: The current air ventilation system of our hospital does not deliver the clean air to the operating site efficiently in occupied OR. Conclusions: We suggested a new location of air ventilation system which improves air venting with little increase of the cost of equipment.
요하지통 환자에서 두 개의 캐눌라를 이용한 박동성 고주파 신경근 응고술의 임상 연구
김천숙,배재영,배덕구,강규식,안기량,권진형,김지은,유시현 순천향의학연구소 2003 Journal of Soonchunhyang Medical Science Vol.9 No.1
Dorsal root ganglion(DRG) block by the local anesthetics and steroids which has done classically in low back pain(LBP) patients with radiculopathy has high incidence of recurrence rate and side effects of steroids. Recently a new technique of pulsed radiofrequency thermocoagulation(P-RFTC) was introduced and substituted for it because of the benefits such as relatively low recurrence rate, low risk of nerve injury and comfort during the procedure. We experienced 15 patients who had LBP with radiculopathy and no or little response to epidural steroid injection. When we performed DR ganglionotomy by P- RFTC under the C-arm guide in these patients, we tried to approach the exact DR ganglion using tow cannulas - the one for obtaining patient's subjective symptoms and injection of contrast dye, the other for making a RF lesioning after identifying the impedance of sensory and motor stimulation. In conclusion, DR ganglionotomy by P- RFTC using two cannulas in LBP patients is an easy and safe procedure with satisfactory results.
Ji Hea Chang,이호준,Jae Hyun Kwon,Gi Hyeong Ryu,Heebong Moon,Changjae Kim,남기연,권범선 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.6
Objective To investigate the usefulness of computed tomography venography (CTV) for evaluation of leg swelling, especially deep vein thrombosis (DVT), in rehabilitation patients.Methods A hundred twenty-three patients, who had performed CTV performed because of suspected DVT in our clinic, were enrolled. We performed chart reviews retrospectively and categorized CTV findings as follows: DVT distal to inguinal ligament and no compression lesion; DVT proximal to inguinal ligament and no compression lesion; DVT distal to inguinal ligament and anatomical variant (for example, May-Thurner syndrome); DVT due to compression of mass (cancer or cyst); DVT and other incidental abnormal finding; and no DVT and other possible causes of leg swelling.Results DVTs were found in 65 (53%) patients. DVTs were found at distal level (thigh or lower leg) to inguinal ligament in 47 patients. DVTs were found at proximal to inguinal ligament, usually undetectable with duplex ultrasonography, in 6 patients. DVTs caused by external compression, such as femoral vein and cancer mass, were found in 12 patients (10%), which are also not easily detected with duplex ultrasonography. Other various causes of leg edema without DVT were found in 22 (18%) patients.Conclusion CTV can evaluate more extensively venous problems in the pelvis and abdomen and detect other possible causes of leg swelling. Therefore, CTV can be a useful tool not only for easy detection of DVT but also for evaluating differential diagnosis of leg edema in rehabilitation patients.
( Ji Oh Mok ),( Chan Hee Jung ),( Chul Hee Kim ),( Chang Beom Ryu ),( Yeo Joo Kim ),( Sang Jin Kim ),( Hyeong Kyu Park ),( Kyo Il Suh ),( Myung Hi Yoo ),( Dong Won Byun ) 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.6
Background/Aims: This study was performed to compare the mucosal findings after esophagogastroduodenoscopy in two groups before and after the use of alendronate only and following administration of the enteric-coated alendronate (5 mg) and calcitriol (0.5μg) combined drug (Maxmarvil, Yuyu Co.). Methods: The study population consisted of 33 postmenopausal healthy female volunteers, aged 50 to 70 years (mean age, 58 ± 5) without gastrointestinal symptoms and with normal baseline endoscopic findings. Esophagogastroduodenoscopy was performed at baseline and was repeated 2 weeks later after daily intake of Maxmarvil (n = 17 subjects) or alendronate only (n = 16 subjects). Mucosal injury scores were reported by an endoscopist after 2 weeks of treatment with each medication schedule. Results: Esophageal mucosal injuries developed in two of 16 subjects in the alendronate only group and 0 of 17 in the Maxmarvil group. Gastric mucosal injuries developed in eight subjects in the alendronate group and four subjects in the Maxmarvil group; this difference was statistically significant. Conclusions: The mucosal damage scores for the alendronate group (total score 24) were significantly higher than those for the Maxmarvil group (total score 9) in the esophagus and stomach. Therefore, this study suggested that enteric-coated Maxmarvil is less harmful to gastrointestinal mucosa than alendronate, and may improve the tolerability of osteoporosis medication in clinical practice.
Ji-Yea Lee,Sung-Hoon Han,Hyeong-Seok Ryu,Hee-Min Lee,Sang-Cheol Kim 대한치과교정학회 2018 대한치과교정학회지 Vol.48 No.6
Objective: The purpose of this study was to analyze the transverse dental compensation in reference to the maxillary and mandibular basal bones using cone-beam computed tomography (CBCT) and evaluate the correlations between transverse dental compensation and skeletal asymmetry variables in patients with skeletal Class III malocclusion and facial asymmetry. Methods: Thirty patients with skeletal Class I (control group; 15 men, 15 women) and 30 patients with skeletal Class III with menton deviation (asymmetry group; 16 men, 14 women) were included. Skeletal and dental measurements were acquired from reconstructed CBCT images using OnDemand3D 1.0 software. All measurements were compared between groups and between the deviated and nondeviated sides of the asymmetry group. Correlation coefficients for the association between skeletal and dental measurements were calculated. Results: Differences in the ramus inclination (p < 0.001), maxillary canine and first molar inclinations (p < 0.001), and distances from the canine and first molar cusp tips to the midmaxillary or midmandibular planes (p < 0.01) between the right and left sides were significantly greater in the asymmetry group than in the control group. In the asymmetry group, the ramus inclination difference (p < 0.05) and mandibular canting (p < 0.05) were correlated with the amount of menton deviation. In addition, dental measurements were positively correlated with the amount of menton deviation (p < 0.05). Conclusions: Transverse dental compensation was correlated with the maxillary and mandibular asymmetry patterns. These results would be helpful in understanding the pattern of transverse dental compensation and planning surgical procedure for patients with skeletal Class III malocclusion and facial asymmetry.
Kim, Hyeong Jun,Kim, Jae-Han,Ryu, Ji-Ho,Kim, Youngkwon,Kang, Hyunbum,Lee, Won Bo,Kim, Taek-Soo,Kim, Bumjoon J. American Chemical Society 2014 ACS NANO Vol.8 No.10
<P>While most high-efficiency polymer solar cells (PSCs) are made of bulk heterojunction (BHJ) blends of conjugated polymers and fullerene derivatives, they have a significant morphological instability issue against mechanical and thermal stress. Herein, we developed an architecturally engineered compatibilizer, poly(3-hexylthiophene)-<I>graft</I>-poly(2-vinylpyridine) (P3HT-<I>g</I>-P2VP), that effectively modifies the sharp interface of a BHJ layer composed of a P3HT donor and various fullerene acceptors, resulting in a dramatic enhancement of mechanical and thermal stabilities. We directly measured the mechanical properties of active layer thin films without a supporting substrate by floating a thin film on water, and the enhancement of mechanical stability without loss of the electronic functions of PSCs was successfully demonstrated. Supramolecular interactions between the P2VP of the P3HT-<I>g</I>-P2VP polymers and the fullerenes generated their universal use as compatibilizers regardless of the type of fullerene acceptors, including mono- and bis-adduct fullerenes, while maintaining their high device efficiency. Most importantly, the P3HT-<I>g</I>-P2VP copolymer had better compatibilizing efficiency than linear type P3HT-<I>b</I>-P2VP with much enhanced mechanical and thermal stabilities. The graft architecture promotes preferential segregation at the interface, resulting in broader interfacial width and lower interfacial tension as supported by molecular dynamics simulations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-10/nn503823z/production/images/medium/nn-2014-03823z_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn503823z'>ACS Electronic Supporting Info</A></P>
다양한 파장의 LED 조사가 주요 식중독 미생물의 생장에 미치는 영향
이지은(Ji-Eun Lee),쉬시아오통(Xiaotong Xu),정소미(So-Mi Jeong),김수룡(Su-Ryong Kim),김한호(Han-Ho Kim),강우신(Woo-Sin Kang),류시형(Si-Hyeong Ryu),이가혜(Ga-Hye Lee),안동현(Dong-Hyun Ahn) 한국생명과학회 2021 생명과학회지 Vol.31 No.10
본 연구에서는 4가지 일반적인 식중독 병원균인 Escherichia coli, Salmonella typhimurium, Staphylococcus aureus, Bacillus subtilis에 대해 270 nm UV C-LED, 365 nm UV A-LED, 465~475, 620~630 nm visible-LED, 850, 5,000~7,000 nm infrared-LED를 조사하여 각 세균의 성장에 미치는 영향을 조사 하였다. 270 nm UV C-LED의 경우, 10 min 또는 30 min 조사 시 4가지 균주 모두 대조구에 비해 억제 효과를 나타냈다. 또한 365 nm UV A-LED를 1시간 또는 3시간 조사한 경우 B. subtilis의 100% 생장 억제를 보였다. 465~475 nm visible-LED를 1시간 조사한 경우, 4 종류 균주 모두 대조구과 유의 한 차이가 없었으며, 3시간 조사 시 유의한 성장 억제를 보였다. 620~630 nm visible-LED를 처리한 S. aureus와 B. subtilis, 850 nm infrared-LED를 처리한 S. typhimurium과 S. aureus, 5,000~7,000 nm infrared-LED를 처리한 E. coli, S. typhimurium 및 S. aureus는 각각 대조구에 비해 증식되는 것으로 확인되었다. 이에 따라 다양한 LED 광원의 사용을 통해 식중독 미생물의 억제 및 증식 효과를 확인한 바, 다양한 LED 광원의 파장 특성을 이용한 식품 보존과 응용 기술로서의 잠재력이 있음을 시사한다. In this study, four common food-borne bacteria, namely, Escherichia coli, Salmonella typhimurium, Staphylococcus aureus, and Bacillus subtilis, were targeted via irradiation with 270 nm UV C-LED, 365 nm UV A-LED, 465~475 and 620~630 nm visible-LED, and 850 and 5,000~7,000 nm infrared-LED light. The effect on the growth of each bacterial species was investigated. In the case of 270 nm UV C-LED, all four strains showed inhibitory effects compared with the control group when irradiated for 10 or 30 min. Furthermore, when irradiated with 365 nm UV A-LED for 1 or 3 hr, B. subtilis showed 100% growth inhibition. When irradiated with 465~475 nm visible-LED for 1 hr, all four strains showed no significant difference from the control group but showed significant growth inhibition when irradiated for 3 hr. S. aureus and B. subtilis treated with 620~630 nm visible-LED; S. typhimurium and S. aureus treated with 850 nm infrared-LED; and E. coli, S. typhimurium, and S. aureus treated with 5,000~7,000 nm infrared-LED were confirmed to significantly proliferate compared with the control group. The results of this experiment show the potential of the use of various LED light sources as a food preservation and application technology by examining their effect on the inhibition and growth of food-borne bacteria and by grasping the characteristics of each wavelength.
고로슬래그 미분말과 플라이애시를 사용한 비소성 시멘트 모르타르의 촉진 탄산화에 따른 압축 강도 특성
류지수 ( Ryu Ji-su ),나형원 ( Na Hyeong-won ),형원길 ( Hyung Won-gil ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In the concrete industry, efforts are being made to reduce CO<sub>2</sub> emissions, and technologies that collect, store, and utilize CO<sub>2</sub> have recently been studied. This study analyzed the change in compressive strength after the accelerated carbonation test of Non-Sintered Cement(NSC) mortar. Type C Fly Ash and Type F Fly Ash were mixed in a 1:1 ratio and then mixed with Blast Furnace Slag fine powder to produce NSC. The mortar produced was cured underwater until the target age. In addition, an accelerated carbonation test was conducted under the condition of a concentration of 5 (±1.0%) of CO<sub>2</sub> gas for 14 days. The mortar compressive strength was measured before and after 14 days of accelerated carbonation test based on the 7th and 28th days of age. As a result of the experiment, the compressive strength was improved in all binder. In general, the compressive strength of NSC mortar subjected to the accelerated carbonation test was similar to that of Ordinary Portland Cement(OPC) mortar not subjected to the accelerated carbonation test.