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Effects of Neutral Salts on Alkaline Hydrolysis of Poly(ethylene Terephthalate) Fiber(II)
Dho,Seong-Kook,Cho,Hwan,Hwang,Eun-Kyung 東亞大學校 1991 東亞論叢 Vol.28 No.1
폴리에틸렌 텔레프탈레이트섬유를 수산화 칼륨으로 가수분해시킬때도 중성염이 큰 영향을 미치는가를 검토하기 위하여 중성염의 종류, 처리농도, 처리온도, 처리시간 등을 달리하여 반응시킨후 감량율, 반응속도 상수, 겉보기 활성화 에너지 등을 구하였다. 네종류의 중섬염, 즉 Na₂So₄, NaCl, K₂So₄, KCl은 모두 감량 촉진 효과가 있었으며 그 효과는 Na₂So₄가 가장 컸고 K₂So₄,KCl, NaCl순으로 작아졌다. 그리고 폴리에틸렌 텔레프탈레이트섬유의 알칼리 가수분해시 반응용기내에 존재하는 양이온의 종류와 농도가 큰 영향을 미친다는 사실을 알았다.
Catastrophic Intramedullary Abscess Caused by a Missed Congenital Dermal Sinus
Dho, Yun-Sik,Kim, Seung-Ki,Wang, Kyu-Chang,Phi, Ji Hoon The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.3
Congenital dermal sinus (CDS) is a type of occult spinal dysraphism characterized by a midline skin dimple. A 12-month-old girl presented with fever and ascending quadriparesis. She had a midline skin dimple in the upper sacral area that had been discovered in her neonatal period. Imaging studies revealed a holocord intramedullary abscess and CDS. Overlooking CDS or misdiagnosing it as benign sacrococcygeal dimple may lead to catastrophic infection and cause serious neurological deficits. Therefore, further imaging work-up or consultation with a pediatric neurosurgeon is recommended following discovery of any atypical-looking dimples in the midline.
Investigation of the location of atypical teratoid/rhabdoid tumor.
Dho, Yun-Sik,Kim, Seung-Ki,Cheon, Jung-Eun,Park, Sung-Hye,Wang, Kyu-Chang,Lee, Ji Yeoun,Phi, Ji Hoon Springer Verlag 2015 Child's nervous system Vol.31 No.8
<P>The location of a brain tumor is a fundamental characteristic, because various brain tumors develop in relatively specific locations. An atypical teratoid/rhabdoid tumor (AT/RT) is a highly age-specific tumor that occurs in infants and young children. However, AT/RTs develop in a variety of locations in the brain. This study aimed at uncovering the tumor location pattern of AT/RTs to enhance diagnoses.</P>
Dho, Yun-Sik,Kim, Yong Hwy,Se, Young-Bem,Han, Doo Hee,Kim, Jung Hee,Park, Chul-Kee,Wang, Kyu-Chang,Kim, Dong Gyu American Association of Neurological Surgeons 2018 Journal of Neurosurgery Vol.129 No.3
<B>OBJECTIVE</B><P>The endoscopic endonasal approach (EEA) is commonly used for the treatment of craniopharyngioma; therefore, it is essential to analyze outcomes in order to understand the benefits and drawbacks. The goal of this paper was to evaluate the clinical features and outcomes associated with this treatment approach.</P><B>METHODS</B><P>From July 2010 to March 2016, 82 adult craniopharyngioma patients underwent an EEA at the authors’ institution. Of these cases, intraoperative records and immediate postoperative MR images were available for 68 patients. The patients underwent systemized endocrinological evaluation. Eighteen of 68 patients who underwent EEA for recurrence or regrowth of residual lesions after previous surgical management were excluded in the analysis of the anatomical tumor classification. The authors retrospectively analyzed preoperative clinical features and previous anatomical classifications, focusing on the relationship of the pituitary stalk and tumor, to determine predictive factors for the clinical outcome, such as the extent of resection, visual function, endocrinological function, recurrence rate, and complications.</P><B>RESULTS</B><P>The mean tumor size was 2.5 cm (3.1 cm for primary tumors and 1.9 cm for recurrent lesions). Gross-total resection (GTR) was achieved in 62 (91.1%) patients (48 [96.0%] patients with primary tumors and 14 [77.8%] patients with recurrent tumors). The rate of GTR was higher in the primary group than in the group with recurrence (p = 0.038). The overall pre- and postoperative visual impairment scale (VIS) scores were 40.8 and 22.1, respectively (50.9 and 14.3 in the primary group and 30.7 and 29.9 in patients with recurrence, respectively). The improvement rate in VIS score was higher in the primary group than in the recurrent group (p = 0.001). Endocrinological function was improved in 4 patients (5.9%) and deteriorated in 32 of 68 patients (47.1%). Tumor invasion into the center of the pituitary stalk affected the postoperative outcomes most significantly. Cognitive dysfunction was observed in 22 patients before surgery and improved in 20 patients (90.9%) after surgery. Hydrocephalus was found in 7 patients and resolved after surgery in all cases. CSF leakage occurred in 2 (2.9%) of 68 patients and was repaired by revision surgery in both patients. Ten patients without CSF leakage also received antibiotics for the treatment of meningitis. The infection rate was higher in the recurrent group. Postoperative endocrinological evaluation showed no deficits in 12 patients and panhypopituitarism in 55 patients. The remaining patient had growth hormone deficiency. Forty-three patients had new-onset diabetes insipidus, and 1 patient had persistent diabetes insipidus after surgery. There were 2 (2.9%) cases of recurrence during the mean 30.7-month follow-up period; one patient underwent radiosurgery and the other underwent reoperation.</P><B>CONCLUSIONS</B><P>The EEA resulted in excellent surgical outcomes and acceptable morbidity rates, regardless of the anatomical location of the tumor. Invasion of the craniopharyngioma into the center of the pituitary stalk has strong predictive power for postoperative endocrinological outcome.</P>
Weight Loss of Poly(ethylene terphthalate)Fiber by Trisodium Phosphate
Dho, Seong-kook,Cho, Hwan 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
폴리 에틸렌 텔레프탈레이트 섬유는 우수한 물성 때문에 섬유로서의 효용가치가 크다. 그러나 염색성, 흡습성, 대전성, 촉감 등에 단점이 있다. 특히, 경한 촉감의 개선을 위해서 수산화 나트륨에 의한 감량가공이 행하여지고 있으며 처리 섬유는 촉감 뿐 아니라 흡습성 및 대전성도 다소 개선되는 것으로 알려져 있다. 본 실험은 현재 사용되는 수산화나트륨 이외에 적절한 감량가공을 행할 수 있는 알칼리제를 찾기 위하여 예비실험에서 수종의 알카리제를 사용하였다. 그 결과 트리소디움 포스케이트가 폴리에틸렌 텔레프탈레이트 섬유의 감량가공에 실제 사용될 수 있다고 생각하였다. 몇가지 얻어진 결론은 감량율은 처리시간, 농도, 온도에 따라 증가하였으며 강도는 감소하였다. 감량에 의해 촉감 및 흡습성은 개선되었으나 실용감량율에 도달하는데는 과량의 트리소디움 포스케이트와 장시간이 소요되었다.
External Field Dependence of $Fe^57$ NMR in Pure Iron
Dho, Joongheo,Kim, Mincheol,Lee, Soonchil,Lee, Wonjong,Kim, Yoonbae The Korean Magnetics Society 1996 Journal of Magnetics Vol.1 No.1
The NMR spin echo in pure iron was measured as a function of external magnetic field up to 10 kgauss at room temperature. We observed the signal coming from a single domain formed over 7.5 kgauss which has not been detected in previous works. The resonance frequency shift with external field confirmed that the hyperfine field in iron is -330.2 kgauss. From the comparison of the magnetization curve with the domain wall signal and the resonance frequency in external field, we showed that NMR could give the useful qualitative information on the magnetization process. The extent of the internal strain removed by annealing, which can be hardly seen in hysteresis curves, was clearly shown up in the NMR line-width.
Separation Process of Copper and Nickel by Chelate Flotation
Dho, Hyon Seung 청주대학교 산업과학연구소 2021 産業科學硏究 Vol.38 No.2
본 연구는 부유 선광을 통해 Cu2S와 Ni2S3의 효과적인 분리를 실험한 논문이다. 본 논문에서는 동황화물과 니켈 황화물의 선별에 필요한 여러형태의 직접 제련 공정 방법에 대해 기술하였다. 직접제련 공정의 산물인 구리와 니켈 매트는 부유 선별을 통해 다양하게 공정변수를 변화시키며 효과적인 분리 공정을 개발하였다. 공정변수는 pH, 교반시간, 포수제의 양 및 효과적인 억제제의 개발을 통해 확보하였다. 본 실험에서는 일반적으로 사용하는 KEX를 포수제로 사용하였다. 단독실험의 결과를 바탕으로 Ni2S3와 Cu2S를 혼합시킨 후 부유선별 실험을 하였다. 이때 사용된 억제제는 킬레이트 시약인 salicylaldoxime이다. 실험결과 알칼리성 pH에서 억제제의 양의 증가에 따라 선택적인 선별이 어느정도 이루어졌다.