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Development and Evaluation of the Automated Ion Monitoring System for Closed Hydroponics
( Woo-jae Cho ),( Hak-jin Kim ),( Hee-jo Han ),( Moon-sun Yeom ),( Hye-ri Lee ),( Young-yeol Cho ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.2
Individual real-time managements of nutrient ions in recycling nutrient solutions according to the demand of plants would improve nutrient use efficiencies and crop yields. For the purpose, fast and continuous monitoring of the nutrient ions in nutrient solutions is necessary. In this study, an ion monitoring system equipped with three commercial ISEs for NO3, K, and Ca were developed to monitor the ion concentrations continuously. For the feasibility test, the system was installed on plant factories located on Chungbuk national university and Gyeongsang national university, and evaluated by comparing the measured values with the actual values determined by the standard methods. From the results, the system showed the predictability was comparable to the standard methods when a two-point normalization based sensor management was preceded. Specifically, sensor ratios from the two-point normalization would be applicable as a indicator of the sensor status.
Sang-Chil Lee,Chang-Hwa Jeong,Ho-Yong Im,Seong-Young Kim,Jae-Young Ryu,Hak-Yeol Yeom,Hyeon-Min Kim 대한구강악안면외과학회 2013 대한구강악안면외과학회지 Vol.39 No.2
Focal osteoporotic bone marrow defect (FOBMD) is a radiolucent area corresponding to the presence of hematopoietic tissue rarely found in the jaws. FOBMD is most commonly located in the mandibular edentulous posterior area of a middle-aged female. From November 2011 to November 2012, we experienced three cases involving removal of implants that had accidentally fallen into the FOBMD area. All patients happened to be female, with a mean age of 54 years (range: 51-60 years). One case involved hypoesthesia of the lower lip and chin, while two cases healed without any complication. Displacement of an implant into the FOBMD area is an unusual event, which occurs rarely during placement of a dental fixture. The purpose of this study was to report on three cases of FOBMD and to provide a review of related literature.
Ancient schwannoma in oral cavity: a report of two cases
Na Rae Kim,Dong Hae Chung,Dae-Song Park,Dong-Woo Kim,Sang-Chil Lee,Sung-Yong Kim,Ho-Yong Lim,Hak-Yeol Yeom,Hyeon-Min Kim 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.6
This paper reports two cases of schwannomas arising from the oral cavity. One is an intraoral ancient schwannoma located at the left cheek, which evolved over a period of 13 years. The tumor was a well-demarcated buccal mass, which was located in the left lower first premolar area, with an obliterated the buccal vestibule, leaving the overlying mucosa intact. The second case was a central intraosseous schwannoma located from the left lower 1st molar periapical area to the left 3rd molar periapical area. Pathologically, the first mass was composed of the spindle shaped tumor cells with wavy nuclei beneath the fibroconnective tissue of the gingiva but second case mass was not. Occasional nuclear pleomorphism was observed but mitosis or necrosis was absent. There were Antoni A and B areas along with strong, diffuse staining with the S-100 protein. Ancient schwannomas were diagnosed. Schwannoma is a slow-growing benign tumor, and an ancient schwannoma that shows cellular atypism is a variant of a schwannoma caused by purely degenerative changes. To date, only limited cases of ancient schwannomas in the oral cavity have been reported.
낭종성 법랑모세포종으로 인하여 매복된 하악 구치의 교정-외과 치료: 증례보고
문철현,김현민,박대송,김동우,이상칠,김성용,임호용,염학열,Moon, Cheol-Hyun,Kim, Hyeon-Min,Park, Dae-Song,Kim, Dong-Woo,Lee, Sang-Chil,Kim, Sung-Yong,Lim, Ho-Yong,Yeom, Hak-Yeol 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.5
Ameloblastoma is an aggressive benign odontogenic epithelial tumour that may arise from the enamel organ, remnants of dental lamina, or the lining of an odontogenic cyst. It is usually categorized into solid or multicystic, unicystic, and peripheral types. Treatment ofameloblastomas include conservative methods such as marsupialisation, enucleation, and curettage; and radical treatments such as marginal or segmental resection. Radical treatments have resulted in lower recurrence rates; however, may also encounter esthetic, functional, and reconstructive problems. Unicystic ameloblastoma has been considered less aggressive and a lower recurrence tendency. Thus, many authors have recommended conservative treatment in cases of unicystic ameloblastoma. An 11 year-old boy presented with displaced second and third molars by luminal unicystic ameloblastoma in the mandible. Cyst enucleation, curettage, and third molar extraction were done. No signs of recurrence or esthetic problems such as facial asymmetry were seen radiologically and clinically, up to 8 years 2 months postoperatively.
하악과두하 골절 시 후하악 접근법과 내시경을 이용한 구강 내 접근의 비교
김동우,박대송,이상칠,김성용,임호용,염학열,김현민,Kim, Dong-Woo,Park, Dae-Song,Lee, Sang-Chil,Kim, Sung-Yong,Lim, Ho-Yong,Yeom, Hak-Yeol,Kim, Hyeon-Min 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.6
Purpose: Patients who had a subcondylar fracture with a displaced or deviated condylar segment were treated with a retromandibular approach (RMA) or an endoscope-assisted transoral approach (EATA) in our department of oral and maxillofacial surgery. The clinical results of the approaches were compared. A comparative study of specific approaches for subcondylar fractures has not been published before in Korea. Methods: Twenty-one patients with subcondylar fractures of the mandible were included. Ten patients were treated with the retromandibular approach and 11 were treated with an endoscope-assisted transoral approach. We examined patient age, gender, fracture sites, classifications, period of maxillomandibular fixation, facial nerve (FN) or greater auricular nerve (GAN) injuries, maximal mouth opening, deflection, occlusal changes, number of plates, follow-up period, and other complications. Preoperative computed tomography and pre-operative, post-operative, and follow-up panoramic views were taken of each patient. Results: Mean maximal mouth openings were similar between the two approaches. FN and GAN injuries were more frequent in the RMA group but the deflective rate with mouth opening was higher in the EATA than that in RMA group. Two cases of post-operative infection occurred in the EATA group, and occlusal changes were observed in one case for both approaches. Conclusion: The RMA offers more direct access and visualization of the surgical field but it can cause scars and retractive injuries of the FN and GAN. But, EATA did not result in consequent nerve injuries or scars postoperatively, but unfavorable fractures such as $medial$ $override$ condyles were more difficult to reduce endoscopically. Except cases of an expected difficult reduction, the treatment of choice for a displaced subcondylar fracture may be an EATA.