교류 전기장 인가에 따른 프로판 예혼합 화염의 유동 특성

김보윤,김민석,김태훈,권일송,김혜민 한국분무공학회 2024 한국액체미립화학회지 Vol.29 No.1

This study investigates the flow characteristics of propane-air premixed flames on AC electric field using the Schlieren method. A voltage was applied to the ring electrode and the burner was grounded to form an electric field, and the applied voltage was fixed at 16 kV (Vpp). Results show that under the application of AC electric fields, flow around the flame oscillated only at frequencies below 50 Hz, and no oscillation was observed above this frequency range. Flame height oscillated with frequency in the range of 25 to 300 Hz, with frequency doubling observed in the range of 25 to 150 Hz. The flammability limit increased with frequency up to 250 Hz, but in the high-frequency range above 250 Hz, the flammability limit did not increased and converged.

인도시아닌 그린과 히알루론산 나트륨을 이용한 결막 낭종의 절제

김보윤,강남여 대한안과학회 2011 대한안과학회지 Vol.52 No.8

Purpose: To report a new modified method using a mixture of sodium hyaluronate and indocyanine green solution to facilitate the complete removal of a large conjunctival cyst. Case summary: Two patients with a large conjunctival cyst on the bulbar conjunctiva were treated. In order to achieve complete removal, a mixture of 1% sodium hyaluonate and indocyanine green solution was injected through a 27-G needle into the cyst. The procedure provided excellent visualization of the cyst boundaries while maintaining cyst integrity allowing for an easy and complete resection. Apocrine hidrocystoma and a simple retention cyst were confirmed on histopathologic examination, respectively. Conclusions: During the removal of a large cyst, injecting a mixture of sodium hyaluronate and indocyanine green is effective in delineating the cyst capsule while preserving its integrity, thus aiding in the complete removal of the cyst wall. J Korean Ophthalmol Soc 2011;52(8):994-998

Metabolic Activity of Desalted Ground Seawater of Jeju in Rat Muscle and Human Liver Cells

김보윤,이영기,박덕배 한국수산과학회 2012 Fisheries and Aquatic Sciences Vol.15 No.1

Ground seawater in the east area of the volcanic Jeju Island contains abundant minerals. We investigated the metabolic activity of electrodialyzed, desalted ground seawater (EDSW) from Jeju in both cultured cells and animals. The addition of EDSW to the culture medium (up to 20%, v/v) reduced the leakage of lactate dehydrogenase and increased MTT activity in CHO-IR cells. EDSW (10%) promoted insulin-induced glucose consumption in L6 muscle cells as well as the activities of the liver ethanol-metabolizing enzymes, alcohol dehydrogenase and aldehyde dehydrogenase. Moreover, EDSW suppressed palmitate-induced intracellular fat accumulation in human hepatoma HepG2 cells. Activities of AMP-stimulated protein kinase and acetyl CoA carboxylase, enzymes that modulate fat metabolism, were altered by EDSW in HepG2 cells toward the suppression of intracellular lipid accumulation. EDSW also suppressed hepatic fat accumulation induced by a high-fat diet in mice. Taken together, EDSW showed beneficial metabolic effects, including the enhancement of ethanol metabolism and insulin-induced glucose consumption, and the suppression of intrahepatic fat accumulation.

논설부 : 광장설 (廣長舌) ; 죄막대어자멸 (罪莫大於自蔑)

김보윤 해동불보사 1941 해동불보 Vol.8 No.-

Prevalence and Clinical Characteristics of Epiretinal Mass in Eyes without Pre-existing Retinal Conditions

김보윤,박진형,전소희 한국망막학회 2021 Journal of Retina Vol.6 No.1

Purpose: To evaluate the clinical characteristics of epiretinal mass (EM) in eyes without pre-existing retinal conditions. Methods: The prevalence and the characteristics of eyes showing EM during spectral-domain optical coherence tomography (SD-OCT) examination were reviewed. Results: Among 2,221 eyes undergoing SD-OCT, 34 (1.5%) were found to have EM, which was detected following onset of posterior vitreous detachment (PVD); 32 of 34 (94.1%) eyes showed PVD, while two eyes (5.9%) showed diffuse vitreomacular adhesion at the time of EM detection. The EM was most commonly located at the superior macula, followed by the nasal macula. Of the 17 eyes with SDOCT images obtained at the time of EM decrease, EMs from 12 eyes (70.6%) had diminished completely, while EMs from five eyes (29.4%) had resulted in low-grade epiretinal membranes (ERMs). The time interval between EM appearance and disappearance was about 10 to 12 months. Conclusions: In eyes without pre-existing retinal conditions, EM can develop after PVD and might indicate the existence of a denatured vitreous cortex with a cellular component. These lesions usually resolve spontaneously but can be associated with a low-grade ERM.

간헐외사시의 외직근 후전술 후 Pentacam을 이용한 각막 및 앞방의 변화

김보윤,박신혜,신선영 대한안과학회 2012 대한안과학회지 Vol.53 No.1

Purpose: To investigate changes in corneal keratometry and the anterior chamber in intermittent exotropia after lateral rectus recession using Pentacam. Methods: Corneal keratometry, anterior chamber depth, and anterior chamber volumes were evaluated preoperatively and at 1 week, 1 month, and 2 months postoperatively using Pentacam in 20 patients (40 eyes) who underwent lateral rectus muscle recession. The IOP was measured before and after lateral rectus muscle detachment during the surgery. According to the change in IOP, the patients were divided into 2 groups; Group 1 (△IOP < 3 mm Hg) and Group 2 (△IOP ≥ 3 mm Hg), and the results of the 2 groups were compared. Results: The horizontal keratometry and anterior chamber volumes significantly decreased 1 week postoperatively, although there were no significant differences in vertical keratometry, mean keratometry, or anterior chamber depth. Additionally, there were no significant changes in any measurement parameters at 1 month or 2 months postoperatively. In Group 2, horizontal keratometry, mean keratometry, and anterior chamber volumes showed significant reduction compared with those in Group 1. There were no significant differences between the 2 groups at 1 month postoperatively. Conclusions: Postoperative corneal keratometry and anterior chamber volumes did not change significantly compared to preoperative values in intermittent exotropia after performing lateral rectus muscle recession. However, the higher the ocular muscle tension, the greater were the changes in corneal astigmatism and anterior volumes. J Korean Ophthalmol Soc 2012;53(1):127-132

양안 결막 아밀로이드증 진단과 결막종괴절제 및 냉동치료술 1예

김보윤,송지혜,양석우,김만수 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To report the treatment results of mass excision and cryotherapy in a case of bilateral conjunctival amyloidosis. Case summary: A 72-year-old man with conjunctival mass and foreign body sensations in both eyes visited our clinic. He was previously diagnosed with conjunctival lymphoma after conjunctival biopsy at another hospital. A yellow-pink colored mass was observed in the bulbar conjunctiva. A repeated conjunctival biopsy revealed the mass to be amyloid, consistent with the cervical lymph node biopsy results, and the diagnosis was changed to primary systemic amyloidosis. The patient was treated with melphalan and prednisolone; however, the ocular pain, symblepharon, and conjunctival mass progressed. A 360 degree conjunctivoperiotomy, mass excision, and repeated cryotherapy were performed in the more severely affected left eye. The patient was followed for one year, and there were no complications or progression of the conjunctival lesion. Conclusions: Conjunctival amyloidosis requires local pathologic confirmation as well as a systemic work-up. If surgical removal is necessary despite systemic treatment, mass excision and cryotherapy may be effective. J Korean Ophthalmol Soc 2011;52(5):628-632

Impatiens cardamomensis (Balsaminaceae), a new species from Cambodia

김보윤,원효식,Chhang Phourin,임창근,신재서,김영실,조성현 한국식물분류학회 2019 식물 분류학회지 Vol.49 No.4

Impatiens cardamomensis S. H. Cho, C. K. Lim & H. Won, a new species of the family Balsaminaceae from the Cardamom Mountain Range in southwestern Cambodia, is described and illustrated. The species is similar to I. noei from Thailand in that it possesses solitary flowers, fusiform capsules, and compressed seeds, but is readily distinguished by its ovate to widely ovate leaves, shorter petioles, widely elliptic dorsal petals and smaller seeds.

Development of dental hygiene gum for cats considering their anatomical features of dentition

김보윤,강선미,Lina Susanti,박윤지,김선효,심재호,이은지,서강문 대한수의학회 2019 Journal of Veterinary Science Vol.20 No.5

The purpose of this study was to develop effective dental hygiene chews for cats based on the anatomical features of the dentition and patterns of chewing motion. All cats were volunteered for dental prophylaxis followed by dental impressions using yellow stone and alginate under general anesthesia. Twenty parameters related to dentition were defined in order to compare dental impressions using digital caliper. For the chewing motion study, patterns of chewing motion were identified based on recordings made with a digital camera. Ten cats (4 domestic shorthairs, 2 Russian blues, 1 American shorthair, 1 Persian, 1 Turkish Angora, and 1 Devon Rex) were recruited for the study. The parameters related to teeth and oral size were similar among the studied cats. Chewing motion can be described as more of a guillotine-like motion rather than a crushing motion, with cats chewing 3–7 times before swallowing. The chewing pattern of cats involves shearing for a short period of time followed by immediate swallowing. Therefore, the overall size of the dental hygiene chew could be determined based on the measurement of the oral size for inducing chewing. The surface details of the dental hygiene chew could be designed for prevention and removal of dental calculus and plaque in cats considering the anatomical teeth parameters. Dental hygiene chews customized for cats considering the different anatomical features of their teeth might be effective for oral care.

산소부화 조건에서 전기장 인가에 따른 화염의 특성

김보윤(Boyun Kim),김민석(Minseok Kim),김태훈(Taehun Kim),김혜민(Hyemin Kim) 항공우주시스템공학회 2023 항공우주시스템공학회 학술대회 발표집 Vol.2023 No.10