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CO_2와 Methanol로부터 Dimethyl Carbonate의 직접 합성시 복합산화물(Ce_0.8Ti_0.2O_2)과 이에 담지된 금속/산화물 촉매의 효과
이용상,고재천,김광주,구기갑 한국공업화학회 2003 응용화학 Vol.7 No.1
Dimethyl carbonatc was used as a reagent which introduces the carbonyl and methyl group into chemical compound. In thi work, mixed oxide catalysts were prepared from cerium(Ⅲ) nitrate hexahydrate and titanium dioxide. Also, noble and transition metals were incorporated wiht the ixed oxide catalyst. After the calcination of corresponding catalysts under 5% H2 gas, the mixed oxide catalysts were empioyed in the synthesis of dimethyl carbonate. Prior to the calcination, mixed oxide cctalyst shows the high activity for the reaction. But, after the treatment, the activity of catalyst was greatly reduced. From the expertmental results, the oxidation state of noble metal incorporated with mixed oxide catalysts have an offect on the oxidation reaction of methanol in the synthesis of dimdthyl carbonate.
양악 전방분절골절단술과 이부 성형술을 통한 개방교합의 치험례
황용인Yong-In Hwang,홍순민Sun-Min Hong,박준우Jun-Woo Park,이건주Gun-Joo Rhee,조형준Hyung-Jun Cho,천세환Se-Hwan Cheon,박양호Yang-Ho Park 대한구강악안면외과학회 2008 대한구강악안면외과학회지 Vol.34 No.3
Skeletal anterior open bite is a difficult problem to correct in orthodontic treatment. To treat adult patients who have skeletal anterior open bite, we considered two methods. Combination treatment of orthodontics & surgery and camouflage orthodontic treatment. In adults, treatment of severe skeletal anterior open bite consists mainly of surgically repositioning the maxilla or the mandible. However, camouflage therapy is often the treatment of choice for skeletal open bite patients who have mild to moderate skeletal discrepancies when growth modification is no longer possible. But excellent results generally require careful coordination of the orthodontic and surgical phases of treatment. This is a case report of a skeletal anterior open bite patients who were treated with orthodontic treatment and orthognathic surgery. First case was diagnosed as skeletal class I malocclusion & bimaxillary protrusion with anterior open bite, and finally treatment ended for removal of open bite with orthodontic procedure and bimaxillary anterior segmental osteotomy surgery. Second case was diagnosed as skeletal class II malocclusion with open bite & mandibular retrusion, and was treated with only camouflage orthodontics because she feared to have a surgery. In a regular follow up visit after debonding we proposed to the patient advanced genioplasty, and in her agreement her facial esthetics was improved through the surgery.
A case of malignant melanoma with atypical feature previously treated by laser therapy
( Joo Ran Hong ),( Ji Su Lee ),( Sung Min Kim ),( Ji Youn Hong ),( Jin Hee Kim ),( Hye In Cheon ),( Min Seok Hur ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Laser therapy of pigmented lesions is a commonly performed procedure. However, it should be performed prudently as it can complicate the diagnosis and lead to the diagnosis delay. If there is any doubt whether the pigmented lesion is benign, then a biopsy for histologic evaluation is obligatory. A 44- year-old woman visited our clinic with a coin sized, dark bluish-red, and protruding tumor on her thigh. The patient reported that a pigmented lesion had been treated with laser at a local clinic a year ago without prior histological assessment. A skin biopsy was performed at our clinic, and the biopsy confirmed the diagnosis of malignant melanoma. 18F-FDG PET/CT showed no evidence of distant metastases. Herein, we report a case of malignant melanoma presenting after laser therapy of a pigmented lesion. This case emphasizes the importance of careful examination before the laser therapy, and the value of histopathologic review for accurate diagnosis and treatment.
Cheon, Chong Kun,Sohn, Young Bae,Ko, Jung Min,Lee, Yeoun Joo,Song, Ji Sun,Moon, Jea Woo,Yang, Bo Kyoung,Ha, Il Soo,Bae, Eun Jung,Jin, Hyun-Seok,Jeong, Seon-Yong Springer-Verlag 2014 Journal of human genetics Vol.59 No.6
<P>Kabuki syndrome (KS) (OMIM#147920) is a multiple congenital anomaly/mental retardation syndrome. Recently, pathogenic variants in KMT2D and KDM6A were identified as the causes of KS in 55.8-80.0% of patients. To elucidate further the molecular characteristics of Korean patients with KS, we screened a cohort of patients with clinically defined KS for mutations in KMT2D and KDM6A. Whole-exome sequencing and direct sequencing for validation were performed in 12 patients with a clinical suspicion of KS. KMT2D and KDM6A mutations were identified in 11 (91.7%) patients. No recurrent mutation was observed, and 10 out of the 11 mutations found were novel. KMT2D mutations were detected in 10 patients, including four small deletions or insertions and four nonsense and two missense mutations. One girl had a novel splice-site mutation in KDM6A. Each patient had a unique individual mutation. This is the first report of mutational analysis via exome sequencing in Korean patients with KS. Because the mutation-detection rate was high in this study, rigorous mutation analysis of KMT2D and KDM6A may be an important tool for the early diagnosis and genetic counseling of Korean patients with KS.</P>
A case of acral persistent papular mucinosis treated with carbon dioxide laser
( Joo Ran Hong ),( Ji Su Lee ),( Sung Min Kim ),( Ji Youn Hong ),( Jin Hee Kim ),( Hye In Cheon ),( Min Seok Hur ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Acral persistent papular mucinosis (APPM) is a rare subtype of localized lichen myxedematosus. The lesions of APPM are limited to the skin and usually do not require treatment, except for the cosmetic concern. There is no specific treatment of APPM. Topical and intralesional corticosteroids, topical tacrolimus, and laser therapy have been used with variable success. A 63-year-old woman presented with a 10-year history of 2-5mm sized, multiple, discrete, and skin-colored papules on the extensor aspects of her distal forearms. The lesions were asymptomatic and had increased slowly in number. Her medical history was significant only for diabetes and dyslipidemia. Mucin deposition in the upper and mid dermis without epidermal involvement was shown on histopathologic examination. On the diagnosis of APPM, we treated the patient with carbon dioxide laser for some of the lesions which responded well but left behind mild scars. Herein, we report a rare case of APPM treated by carbon dioxide laser. This report would be helpful to suggest a potential treatment option for APPM patients who desire therapy.
( Joo Ran Hong ),( Ji Youn Hong ),( Jin Hee Kim ),( Hye In Cheon ),( Min Seok Hur ),( Byung Gon Choi ),( Song Hee Han ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
Reactive angioendotheliomatosis (RAE) is a rare benign angioproliferative condition of the skin. RAE manifests as diverse and nonspecific cutaneous lesions such as macules, papules, plaques and ulceration. Although the pathogenesis has not been fully elucidated, various diseases that cause vascular occlusion and hypoxemia are related to RAE. However, RAE after varicose vein surgery is rarely reported. A 26-year-old man visited our clinic with a 2-year history of painful skin lesions affecting the left lower limb. The lesions were poorly delimited, with deep purple colored plaques and macules. He had a varicose vein surgery by unlicensed non-medical personnel 5 years ago. Prominent proliferation of endothelial cells within the lumina of dermal vessels was observed in histologic examination. Immunohistochemistry showed that endothelial cells stained positively for CD31 and CD34. On the basis of the above findings, the patient was diagnosed with RAE. We referred the patient to rehabilitation center in order to alleviate the chronic leg edema worsening after varicose vein surgery.
Performance Evaluation of Motor-Operated Valve Using Electrical Signatures
Joo Moon Park,Hyung Jun Joo,Jae Cheon Jung,Key Yong Sung,Se Jin Seong 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper is to see the availability of electrical signatures as a means for evaluating the performance and monitoring mechanical anomalies of (MOVs) To estimate motor torque, two methods such as d-q frame conversion and air-gap method are suggested and estimated results are compared with measured values The error between measured and estimated torques is within acceptable error bound with below 1 % under varied load Frequency domain analysis of calculated torque has been done as well It is shown that monitoring of peak frequency could give useful clues to detect anomalies of MOV As results, electrical signatures at MOV motor is expected to be an available tool for estimation of motor capacity and monitoring of electrical and mechanical abnormalities.<br/>