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Jung‑Hun Lee,Min‑Su Park,Hong‑Seon Ahn,Kyung‑Won Park,Jun‑Seok Oh,Seung‑Gyu Jeon,Dong‑Kyu Kim,Jae‑Eon Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4
When large scales DG are connected to the distribution system of unidirectional power currents, bi-directional power currents are formed, making it impossible to use conventional overcurrent protection methods alone to detect and isolate fault sections for ground and short-circuit faults. To solve these problems, this study proposed the method of protection against single-line-ground fault of common neutral line multi-contact local power distribution system using distance relay and directional relay. The proposed protection method was applied to the common neutral multi-ground distribution system to validate the protection against single-line-ground fault through the PSCAD/EMTDC software package and efectively detect and isolate only the zone of single-line-ground fault without malfunctions.
정은욱,지삼룡,이영태,박지훈,김동기,제인수,채두근,박성재,박은택,이연재,이상혁,설상영,정정명 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Afferent loop syndrome is an uncommon complication of a gastrectomy and Billroth Ⅱ reconstruction. It may cause symtoms at any time from the first postoperative day to many years after the gastrectomy. Afferent loop syndrome is characterized by abdominal pain, vomiting and elevation of serum amylase. Thus, it is difficult to differentiate afferent loop syndrome from other cause of acute pancreatitis. However, the history of gastrectomy can be an important clue for diagnosing afferent loop syndrome. We experienced one case of chronic afferent loop syndrome with acute pancreatitis. After appropriate management, the abdominal pain disappeared and serum amylase level decreased. We report this case with a review of relevant literatures.
3-Acetamidophenyl Acetate의 Fries Rearrangement 반응 연구
김동현, 만노즈 마니캄, 풀라레디 보꾸, 이상윤, 조정석, 정상헌 충남대학교 약학대학 의약품개발연구소 2017 藥學論文集 Vol.32 No.-
Fries rearrangement has been known as highly useful reaction for the synthesis of ortho-or para-hydroxyacylbenzene from phenyl ester in the presence of Lewis acid catalyst. Conventionally, aluminum chloride was used as catalyst. For obtaining N-(4-acetyl-3-hydroxyphenyl)acetamide, 3-acetamidophenyl acetate was subjected to Fries Rearrangement reaction using aluminum chloride. Although the desired N-( 4-acetyl-3-hydroxyphenyl)acetamide was obtained, yield was very low. In addition, regioisomer N-(2-acetyl-5-hydroxyphenyl)acetamide and unexpected N-(2-methyl-4-oxo-4H-chromen-7-yl) acet-amide were obtained. NMR study and conversion to known compollnds confirmed the substitlltion pattern of these phenylacetamides and the structure of chromen-4-ones. Under this Fries Rearrangement condition, formation of chromen-4-one was newly discovered.
인레이, 온레이, 3/4금관 및 전부주조관 수복 후 하중을 가할 시 치아내부에 발생하는 응력의 광탄성학적 비교분석
정동곤,조광헌 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.1
The purpose of this study was to evaluate the stress patterns and magnitudes in the internal part of a tooth according to the types of restoration when treated with a M. O. D. cavity preparation. In cases of the lower left 2nd premolar, four two-dimensional photoelastic models with M.O.D. onlay, 3/4crown and full veneer crown were prepared and the restorations were cemented. A vertical load of 30lbs was applied to each model on a two-point contact near the central fossa and a one-point contact on the buccal incline of the buccal cusp. Two dimmensional photoelastic stress analysis was used, and the stress areas were recorded photoelastically. The results were as follows: 1. In the case of the inlay model, the internal stress distributions were the highest especially on the linguopupal line angle. Thus the possibility of fracture on the lingual cusp is the highest among the four models. 2. Comparing the onlay and 3/4 crown, both showed similar stress patterns. However, maximum compressive stress on the linguopulpal line angle and lingual pulpal horn went in the same direction on onlay: therefore, the 3/4 crown was considered better. 3. One the full veneer crown stress distribution showed evenly. It showed the best stress distribution.
치과병원에서 사용되는 진단영상에 대한 JPEG 2000 압축률에 대한 평가
정기훈,한원정,유동수,최순철,김은경 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.3
Purpose : To find out the proper compression ratios without degrading image quality and affecting lesion detectability on diagnostic images used in dentistry compressed with JPEG 2000 algorithm. Materials and Methods : Sixty Digora periapical images, sixty panoramic computed radiographic (CR) images, sixty computed tomographic (CT) images, and sixty magnetic resonance (MR) images were compressed into JPEG 2000 with ratios of 10 levels from 5 : 1 to 50 : 1. To evaluate the lesion detectability, the images were graded with 5 levels (1: definitely absent; 2: probably absent; 3: equivocal; 4: probably present; 5: definitely present), and then receiver operating characteristic analysis was performed using the original image as a gold standard. Also to evaluate subjectively the image quality, the images were graded with 5 levels (1: definitely unacceptable; 2: probably unacceptable; 3: equivocal; 4: probably acceptable; 5: definitely acceptable), and then paired t-test was performed. Results : In Digora, CR panoramic and CT images, compressed images up to ratios of 15 : 1 showed nearly the same lesion detectability as original images, and in MR images, compressed images did up to ratios of 25 : 1. In Digora and CR panoramic images, compressed images up to ratios of 5 : 1 showed little difference between the original and reconstructed images in subjective assessment of image quality. In CT images, compressed images did up to ratios of 10 : 1 and in MR images up to ratios of 15 : 1. Conclusion : We considered compression ratios up to 5 : 1 in Digora and CR panoramic images, up to 10 : 1 in CT images, up to 15 : 1 in MR images as clinically applicable compression ratios.
최동훈,이중림,민승기,박종환,김해영,조재선 慶熙大學校 1998 論文集 Vol.27 No.-
Strain type of lactic acid bacteria was analysed by PCR and SDS-PAGE. PCR allows the rapid and specific detection of lactic acid bacteria using primers based on 16S rRNA gene-sequences. The analysis of protein pattern on SDS-PAGE can be used to determine the differences among the same or similar species of lactic acid bacteria. Therefore, the complementary use of PCR and SDS-PAGE method is one of simple way to classify the lactic acid bacteria and to compare with genetic analysis.
유희정,이성동,김헌수,민병근,박인호 울산대학교 의과대학 1994 울산의대학술지 Vol.3 No.1
The authors experienced a patient with insulinoma presented with neuropsychiatric symptoms. It was demonstrated that Whipple's triad is highly suggestive of the presence of an insulinoma. Therefore physicians and/or psychiatrists, who refer patients with insulinoma to third institution, always have a alertness to neuropsychiatric symptoms of insulinoma and Whipple's triad. This case also illustrated the persistence and cooperation between psychiatric and medical teams including the involvement of a neurologist, endocrinologist, and surgeon for diagnosis and treatment planning of patient with insulinoma.
이동걸,이동훈,이정형,조병채,백봉수 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3
Reconstruction of soft tissue defect with exposure of the tendons and bone in the lower third of the leg and the heel represents a challenge to plastic surgeons. The sural artery flap is a fasciocutaneous flap supplied by the sural artery that accompanies the sural nerve and connects with a septocutaneous perforator of the peroneal artery via a suprafascial network of vessels. For the coverage of soft tissue defects, we operated on 10 patients using a distally-based sural artery flap. The sites of the soft tissue defect were the lower third of the leg in 7 cases and the heel in 3 cases. The size of flap varied from 3.5x4cm to 12x18cm. Nine of 10 flaps survived completely. One flap in which the sural nerve was preserved showed partial necrosis but healed spontaneously. Two flaps showed slightly venous congestion which disappeared after a few days. The advantages of the sural flap are a reliable blood supply, easy and quick elevation of the flap, preservation of the major artery and minimal donor site morbidity. The disadvantage of the flap is hypoesthesia at the lateral part of the foot. In conclusion, the distally-based sural artery flap can be used safely for soft tissues coverage in the lower third of the leg and the heel.
Thyristor-MOSFET 형 고주파 인버터의 특성 해석
이동춘,김동희,소정훈 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2
This paper proposed a high frequency inverter with natural turn-off device. Since state parameters of proposed inverter were nomalized, the characteristics according to rate of inductor, duty ration and equvalent resistive load were presented as useful data for circuit design. The proposed inverter can be realized in practical applications using design data of circuit based on characteristic values obtained from characteristic evaluations.