http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
N,N-Dimethylacrylamide-g-Chitosan 공중합체의 유화안정성
정병옥 ( Jeong Byeong Og ),정석진 ( Jeong Seog Jin ),이경원 ( Lee Gyeong Won ) 한국키틴키토산학회 2004 한국키틴키토산학회지 Vol.9 No.1
신소재로 각광을 받고 있는 천연고분자 물질인 키토산의 단점을 보완하고 효과적인 활용방법을 모색하기 위하여 키토산에 단량체인 N, N-dimethylacrylamide를 그라프트공중합시켜 수용성 키토산 유도체인 DMAACs를 제조하여 유화안정성을 측정한 결과 다음과 같은 결과에 도달하였다. 키토산 유도체 제조에 사용된 키토산의 탈아세틸화도는 98.7% 이상 이었으며, 유화제로 사용한 키토산 유도체인 DMAACs의 점성도평균분자량은 7.93×10^(6)이었다. 키토산과 키토산유도체인 DMAACs의 구조확인은 FT-IR과 ^(1)H-NMR을 사용하여 키토산과 키토산 유도체가 제조되었음을 확인하였다. 유화안정성은 옥배유와 증류수의 비율이 3:2일 때 가장 좋은 혼합율을 나타내었으며, 유화제의 투입농도는 0.14%(w/v) 이상에서는 100%의 유화안정성을 나타내었다. 균질화시간에 따른 유화 안정성은 11000 rpm에서 20sec 이상 균질화시켰을 때 유화 안정성이 우수하였다. 유화저장온도가 25~65℃ 온도구간에서는 100%의 유화안정성을 나타내고 있다. 따라서 DMAACs는 W/O형의 계면활성제 임을 알 수 있었다. Chitosan has been used as a new material due to its outstanding performance. To overcome the disadvantage of chitosan such as low water solubility and to expand its application, a derivative of chitosan was prepared grafting N,N-dimethylacrylamide on the amino groups of chitosan. The deacetylation degree of chitosan was 98.7%. The water-soluble chitosan used as an emulsifier showed the viscosity-average molecular welght of 7.93×10(6). Fourier transform infrared(FT-IR) spectroscopy and H-NMR were used to confirm the synthesis of N,N-dimethylacrylamide grafted chitosan (DMAACs). Results for emulsifying agent using the perfectly stabilized beyond the concentration of 0.14 (w/v)%. In the homogenized time of 20 sec at 11,000 rpm. In addition, the emulsion was stabilized at storage temperature between 25 and 65˚C. Thus, the DMAACs can be used as an effective emulsifier and its emulsion can be applied to a W/O typed surfactant.
초고집적소자의 층간절연막용 polysilazane계 spin on glass (SOG)에 관한 연구
나시균(Sa-Kyun Rha),정석철(Seog Chul Chung),이재관(Jae Kwan Lee),김진우(Jin Woo Kim),홍정의(Jeong Eui Hong),이원준(Won-Jun Lee) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.1
초고접적소자의 층간절연막으로서의 polysilazane계 spin on glass (SOG)의 적용 가능성을 평가하였다. 상용화된 무기 SOG 계열의 polysilazane과 polysilazane에 산화제를 첨가하여 SiO₂로의 변환 능력을 향상 시킨 물질을 spin coating 하고 curing하여 SOG 막을 제조한 다음, 400℃에서 900℃까지의 온도범위에서 열처리하면서 SOG 막의 특성을 조사하여 산화제 및 열처리 온도의 효과를 조사하였고, line and space pattem에 SOG 막을 형성하여 gapfill 특성을 비교하였으며, SOG 막에 contact hole을 형성한 다음 습식 세정에 대한 저항성을 평가하였다. 산화제를 첨가함으로써 polysilazane polymer 구조에서 SiO₂로의 변환이 더욱 효과적으로 이루어져, 기존 SOG 막에 비해 밀도 및 습식세정 chemical에 대한 저항성이 우수하고 gapfill 특성은 동등한 수준인 SOG 막을 제조할 수 있었다. 특히, 기존의 SOG 막의 경우 좁은 gap space 내에서 curing이 충분하게 일어나지 않아 습식 세정시 hole profile이 나빠지는 문제를 산화제 첨가를 통해 해결할 수 있었다. We have investigated the feasibility of spin on glass (SOG) film from polysilazane-type resin as a pre-metal dielectric (PMD) layer of the next-generation ultra-large scale integrated (ULSI) devices. A commercial polysilazane resin and a polysilazane-type resin with oxidizing agent were spin-coated and cured to form SOG films. In order to study the effect of oxidizing agent and annealing, the SOG films were characterized as cured and after annealing at 400℃ to 900℃. The density and the resistance against wet chemical of the SOG films were improved by the addition of oxidizing agent, because oxidizing agent enhanced the conversion from polysilazane polymer to SiO₂. The hole profile issue associated with insufficient curing of polysilazane in narrow gaps was also resolved by oxidizing agent, while the gapfill capability of SOG was not deteriorated by oxidizing agent.
다발성 전신질환 장애환자에서 진행성 치성감염에 의한 측두간극농양 절개 배농시 창상주위 봉합과 배농술에 의한 과도한 출혈조절
손정석(Jeong-Seog Son),오지현(Ji-Hyeon Oh),유재하(Jae-Ha Yoo) Asia association of Disability and Oral health 2013 International Journal of Disability and Oral Healt Vol.9 No.1
The four principles of treatment of odontogenic infection are as follows : (1) removal of the cause, (2) establishment of drainage, (3) institution of antibiotic therapy, and (4) provision of supportive care, including proper rest and nutrition. A separate incision is required to establish drainage, especially in the case of extensive fascial space -infections. There are four principle causes for active bleeding in the immediate incision & drainage phase; (1) vascular wall alteration (infection, scurvy, chemicals), (2) disorder of platelet function, (3) thrombocytopenic purpuras, (4) disorders of coagulation (liver disease, anticoagulation drug). If the hemorrhage from incision & drainage site is aggressive, the site must be packed with proper wet gauze and wound closure & drainage dressing are applied. The specific causes of bleeding may be associated with hypoxia, changes in the pH of blood & chemical changes affecting vascular contractility and blood clotting. This is a case report of bleeding control by the circumferential suture & drainage on active bleeding incision & drainage site of temporal space abscess due to advanced odontogenic infection in a multiple medically compromised disabled patient.
손정석(Jeong-Seog Son),오지현(Ji-Hyeon Oh),유재하(Jae-Ha Yoo),김종배(Jong-Bae Kim) Asia association of Disability and Oral health 2014 International Journal of Disability and Oral Healt Vol.10 No.1
The general local cause of gingival bleeding is the vessel engorgement and erosion by odontogenic infection. Abnormal gingival bleeding is also associated with systemic causes. Bleeding disorders in which continuous gingival bleeding is encountered include the followings : vascular abnormalities, platelet disorders, hypoprothrombinemia and other coagulation defects. There are classic methods for gingival bleeding control, such as, direct pressure, electrocoagulation, suture, crushing and application of hemostatic agents. If the continuous gingival bleeding is not stopped in spite of the conventional methods, the life of patient is threatened owing to upper airway obstruction, syncope, vomiting and hypovolemic shock. Therefore, the rapid and correct hemostatic method is very important in the emergency condition. This is a case report of continuous gingival bleeding control by primary endodontic drainage & suture in a disabled patient with systemic bleeding disorders.
정봉주 ( Jeong Bong Ju ),현동효 ( Hyeon Dong Hyo ),이경욱 ( Lee Gyeong Ug ),류성태 ( Lyu Seong Tae ),이진우 ( Lee Jin U ),이정일 ( Lee Jeong Il ),정석 ( Jeong Seog ),이돈행 ( Lee Don Haeng ),김범수 ( Kim Beom Su ),김형길 ( Kim Hy 대한소화기학회 2004 대한소화기학회지 Vol.43 No.1
Combined hepatocellular-cholangiocarcinoma (HCC-CC) with sarcomatoid features is an extremely rare primary liver cancer, of which only four cases have been reported. We report a case of sarcomatoid combined HCC-CC in a 60-year-old woman who complained of right upper quadrant pain and presented with a 7 cm mass in the S4 region of the liver in abdominal CT. Ultrasonography-guided needle biopsy diagnosed it as HCC, and left lobectomy of the liver followed. Microscopically, the tumor consisted of two portions: HCC portion showing trabecular pattern, which had partially sarcomatous area with spindle-shaped tumor cells, and CC portion with glandular pattern. Immunohistochemically, HCC portion reacted positively with α-fetoprotein while CC portion demonstrated positive reactivity with carcinoembryonic antigen and mucicarmine. Sarcomatoid cells reacted positively for cytokeratin. She died of tumor recurrence and hepatic failure 12 months after the operation. Combined HCC-CC has poor prognosis, and sarcomatoid HCC has high metastatic potential and poor prognosis compared with ordinary HCC. (Korean J Gastroenterol 2004;43:56-60)
손정석,오지현,최병호,유재하,Son, Jeong-Seog,Oh, Ji-Hyeon,Choi, Byung-Ho,Yoo, Jae-Ha 대한치과마취과학회 2013 Journal of Dental Anesthesia and Pain Medicine Vol.13 No.3
Temporomandibular joint (TMJ) dislocation is an acute paintful condition that causes severe functional limitation. So, manual reduction is the treatment of choice and should be performed as early as possible. Long-term dislocation of the TMJ that has persisted for more than 1 month is comparatively rare. This may include severe illness, neurological diseases and prolonged intensive care hospitalization with oral intubation and sedation. A joint that remains prolonged dislocated undergoes morphological change which is also true for periarticular tissue, especially in ligaments and muscles. Treatment of long-term TMJ dislocation should be different from acute TMJ dislocation, as simple reduction is difficult to achieve and it's likely to redislocate. The prevention of redislocation after reduction should be considered. This is a case report of about manual reduction of temporomandibular joint long-standing dislocation under general anesthesia.
폐렴을 동반한 턱관절 탈구환자에서 인상채득 중 유발된 급성 호흡장애
손정석,오지현,유재하,김종배,Son, Jeong-Seog,Oh, Ji-Hyeon,Yoo, Jae-Ha,Kim, Jong-Bae 대한치과마취과학회 2014 Journal of Dental Anesthesia and Pain Medicine Vol.14 No.2
Difficulty in breathing can be very disconcerting to a patient who is conscious yet unable to breath normally. The common causes of acute respiratory distress include hyperventilation, vasodepressor syncope, asthma, heart failure, and hypoglycemia. In most of these situations, the patient does not exhibit respiratory distress unless an underlying medical disorder becomes acutely exacerbated. Examples of this include acute myocardial infarction, anaphylaxis, cerebrovascular accident, hyperglycemia, and hypoglycemia. A major factor that leads to the exacerbation of respiratory disorders is undue stress, either physiologic or psychologic. Psychologic stress in dentistry is the primary factor in the exacerbation of preexisting medical problems. Therefore, the most dental patient should be cared gently as the stress reduction protocol. This is a case report of acute respiratory distress with vasodepressor syncope during alginate impression taking of mandibular teeth in a long-standing temporomandibular joint dislocated 93-years-old pneumonic patient.
뇌졸중 환자에서 항생제 정주 후 유발된 실신과 의식소실: 증례보고
유재하,손정석,김종배,Yoo, Jae-Ha,Son, Jeong-Seog,Kim, Jong-Bae 대한치과마취과학회 2012 Journal of Dental Anesthesia and Pain Medicine Vol.12 No.4
The loss of consciousness in the dental office have many causes, such as, vasodepressor syncope, drug administration, orthostatic hypotension, epilepsy, hypoglycemic reaction, acute adrenal insufficiency, acute allergic reaction, acute myocardial infarction, cerebrovascular accident, hyperglycemic reaction and hyperventilation. Patients have fainted during all phases of dental care: during tooth extraction and other surgical procedures, during local anesthetic injections, or during procedures such as venipuncture, on being seated in the dental chair, and even on first entering the dental office. If an elderly patient with known cardiovascular or cerebrovascular problems experiences a syncopal episode, differentiation from cerebrovascular insufficiency of more serious etiology, such as cerebrovascular accident, must be considered. And anaphylactic shock is also suggested during intravenous drug administration. This is a case report of syncope care during venous injection of cephalosporin in patient with cerebrovascular accident.