Method for Protection of Single‑Line‑Ground Fault of Distribution System with DG Using Distance Relay and Directional Relay

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.

일본산 배 SPS 수입금지 조치 해제의 사전분석

한석호(Suk-Ho Han),서홍석(Hong-Seok Seo),염정완(Jung-Won Youm) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.1

본 논문은 국산 배와 일본산 배에 대한 국내소비자의 무차별 선호를 가정한 가격격차 방법론을 적용하여 일본산 배의 수입금지 조치 해제 시 경제적 · 정량적 영향을 사전에 분석하는 방법론을 소개한다. 방법론을 이용하여 2018년 일본산 배의 수입허용 가정 시 시뮬레이션을 수행한 결과, 연평균 5만 톤의 일본산 배가 국내시장에 유입될 것으로 추정된다. 이 수입량은 국내 배 가격하락 뿐만 아니라 국산 배 생산량 감소를 야기하여 국내 배 생산 감소효과를 초래하여, 연평균 930억원 수준의 직접적인 피해가 예상된다. 국내 배 재배면적과 생산량은 베이스라인 대비 0.7%, 1.4% 감소할 것으로 예측된다. 또한, 생산 · 소비 대체재를 포함한 다른 품목 부문에 미치는 간접적인 영향을 합한 전체 농업분야의 연평균 감소액은 약 2,090억 원 수준으로 베이스라인 대비 0.4% 감소할 것으로 전망된다. 본 연구에서 제안한 SPS 수입금지 조치 해제 시나리오 영향평가는 기존에 수행해오던 양허안 중심의 시나리오 분석과 병행하여, 메가 FTA 참여 시 농업분야 파급영향의 사전분석 방법론을 개선할 것으로 기대된다. This paper proposed a methodology to analyze the economic and quantitative effects of lifting the import ban on Japanese pears by applying a price gap approach in the absence of any preference for either type of pear. Assuming that Korea will allow Japanese pear imports in 2018, the simulation results show that an annual average of 50,000 tons will flow into the domestic market from Japan. These imports will cause a decrease in the price and production of domestic pears, which would have a direct effect on the domestic pear industry, leading to an annual average reduction of 93 billion won. The cultivation area and production quantity are projected to be decreased by 0.7% and 1.4%, respectively, compared to the baseline. Also, the annual average reduction in the overall agriculture sector is predicted to be about 209 billion won, which is a 0.4% reduction compared to the baseline. This research is expected to improve the methodologies available for proactive analysis, with the existing analysis focused on customs tariffs when Korea considers joining mega-FTAs.

산업장 근로자의 스트레스에 대한 한의계 연구경향

차윤엽 ( Yun Yeop Cha ),고연석 ( Youn Seok Ko ),이정한 ( Jung Han Lee ),정원석 ( Won Suk Chung ),신병철 ( Byung Cheul Shin ),전찬용 ( Chan Yong Jeon ),고호연 ( Ho Yeon Go ),선승호 ( Seong Ho Sun ),장보형 ( Bo Hyoung Jang ),송윤경 한방재활의학과학회 2013 한방재활의학과학회지 Vol.23 No.2

Objectives : The purpose of this study is to explore the trends of Korean medical study on stress in the industrial worker. Methods : We received numbers of the studies about stress in the industrial worker from 6 Korean web databases, using key words such as ‘Industry AND Stress’, ‘Oriental medicine AND Stress’, ‘Worker AND Stress’, ‘Workplace AND Stress’. We received 12 research papers and they were analyzed and the journals, the authors, the contents of 3 classification of those research papers. Results : Among them, we had 6 reviews of Dept. of preventive medicine and Dept. of third medicine, college of Korean Medicine, Won-kwang University, and the rest of them were 6 reviews. We had 4 reviews of Korean Journal of Oriental Preventive Medical Society, 2 reviews of the Journal of Traditional Korean Medicine, 2 reviews of Journal of Oriental Neuropsychiatry and so on. According to the contents of reviews, we had 7 reviews of correlation of industrial worker and stress, 4 reviews of cause on the industrial worker’s stress and 1 case report. Conclusions : We reviewed the trends of Korean medical study on stress in the industrial worker. The stress in the industrial workers were related with the type of occupation, social psychology, drinking, smoking, the satisfaction of job, the harmony of organization.And we knew that the musculoskeletal pain was related to the industrial worker’s stress. In the future, abundant case studies, follow-up trials and RCTs should be done about the industrial worker’s stress.

P247 : A study on use of complementary and alternative medicine for acne

( Sook Kyung Lee ),( Taek Geun Lee ),( Hyun Hwang Bo ),( Tae Gwang Kwon ),( Se Won Jung ),( Young Seok Lee ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2

Background: Complementary and alternative medicine (CAM) is any practice that has healing effects, but is not based on evidence demonstrated by scientific method. Recently, CAM has been used in various diseases including acne. However, there have been no studies on CAM for acne in Korea. Objectives: The purpose of this study was to analyze the use of CAM in acne patients. Methods: A total of 159 patients with acne were enrolled on the study, and filled out a questionnaire about use of CAM. Results: Overall 87.4% (139/159) of the patients reported the previous or current use of at least one more type of CAM. Cosmetics for acne (100, 22.9%) was most frequently used, followed by diet therapy (81, 18.5%), spa and bath therapies (77, 17.6%), health food supplement (67, 15.3%), skin care shop (64, 14.6%), oriental medicine (38, 8.7%), and aromatherapy (9, 2.1%). The most common reason for using CAM was ``wish to try everything`` (28.6%), and the most common source of information was internet (40.5%). The therapeutic effect of CAM was best with diet therapy (32.1%). The most common side effect of CAM was aggravation of symptoms. The most common monthly cost for CAM was between 50,000 and 100,000 won/person. Conclusion: As our results, we can predict that the use of various types of CAM for acne will become more common. Therefore, dermatologists need to study about benefits and adverse effects of CAM for acne.

Emergent Endovascular Embolization for Iatrogenic Vertebral Artery Injury during Cervical Discectomy and Fusion

Jung, Hyeun-Jin,Kim, Dong-Min,Kim, Seok-Won,Lee, Sung-Myung The Korean Neurosurgical Society 2011 Journal of Korean neurosurgical society Vol.50 No.6

Injury to the vertebral artery during anterior cervical discectomy is rare but potentially fatal. We report a case of cerebellar infarction after endovascular embolization for iatrogenic vertebral artery injury at C5-C6 during an anterior cervical discectomy and fusion. A 61-year-old man had an intraoperative injury of the right vertebral artery that occurred during anterior cervical discectomy and fusion at C5-C6. Hemorrhage was not controlled successfully by packing with surgical hemostatic agents. While the patient was still intubated, an emergency angiogram was performed. The patient underwent endovascular occlusion of the right V2 segment with coils. After the procedure, his course was uneventful and he did not show any neurologic deficits. Brain computed tomographic scans taken 3 days after the operation revealed a right cerebellar infarction. Anti-coagulation medication was administered, and at 3-month follow-up examination, he had no neurologic sequelae in spite of the cerebellar infarction.

HBV : O-002 ; The efficacy and safety of peginterferon-α-2a in Koreans with hepatitis B: A multicenter study in a real clinical setting

( Jung Hyun Kwon ),( Young Seok Kim ),( Sang Gyune Kim ),( Jeong Won Jang ),( Tae Hun Kim ),( Young Kul Jung ),( Oh Sang Kwon ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-

Background: Genotype C is the principal type of hepatitis B virus in Koreans and is associated with poor prognosis for Peginterferon (PEF-IFN) α-2a therapy. The Korea Health Insurance supports only 24 weeks of therapy in HBeAg positive patients, and there is little report of PEG-IFN α-2a therapy in Korea. Authors investigated the efficacy and compliance to PEG-IFN α-2a therapy in Koreans with chronic hepatitis B (CHB) in a real clinical setting. Methods: CHB patients treated with PEG-IFN α-2a from 2008 to 2011 at four tertiary university hospitals were retrospectively enrolled. Laboratory analyses and adverse events were investigated. Treatment outcomes were evaluated at the end of treatment and at 24 weeks after treatment completion. Results: Eighty-eight patients were enrolled; 67 were HBeAg positive and 50 were men. The mean treatment period was 35.1±8.8 weeks. In 27.3% of the patients, treatment was discontinued due to insufficient antiviral effects (10.2%) and adverse events (9.1%). When patients that completed therapy were analyzed 24 weeks after treatment, 31% of HBeAg positive patients achieved HBV DNA suppression to < 104 c/ml (SVR) and 24.1% of patients achieved HBeAg seroconversion. In HBeAg negative patients, 75% of patients achieved SVR, and 86.7% of patients maintained SVR. By multivariate analysis, a week 24 viral load > 5 log copies/ml was only sig-nificant factor for SVR. During the follow-up period (76.1±46.5 weeks), 29.8% of patients developed a breakthrough HBV DNA level of > 107 c/ml after a reduction to < 104 c/ml and 29.4% of patients reversed HBeAg. No deaths or admissions were attributed to adverse events. Conclusions: These results suggest that PEG-IFN α-2a therapy in Koreans with CHB, showed acceptable virologic response and durability. However, the rate of premature discontinuation was higher in real clinical setting of the present study than in previously reported controlled trials.

Enhanced Succinic Acid Production in Mannheimia Using Optimal Malate Dehydrogenase

Jung Ho AHN,Hogyun SEO,Woojin PARK,Jihye SEOK,Jong An LEE,Won Jun KIM,Gi Bae KIM,Ji Yeon KIM,Kyung-Jin KIM,Sang Yup LEE 한국생물공학회 2024 한국생물공학회 학술대회 Vol.2024 No.4

Original Article : The usefulness of non-invasive liver stiffness measurements in predicting clinically significant portal hypertension in cirrhotic patients: Korean data

( Won Ki Hong ),( Moon Young Kim ),( Soon Koo Baik ),( Seung Yong Shin ),( Jung Min Kim ),( Yong Seok Kang ),( Yoo Li Lim ),( Young Ju Kim ),( Youn Zoo Cho ),( Hye Won Hwang ),( Jin Hyung Lee ),( Myeo 대한간학회 2013 Clinical and Molecular Hepatology(대한간학회지) Vol.19 No.4

Background/Aims: Liver stiffness measurement (LSM) has been proposed as a non-invasive method for estimating the severity of fibrosis and the complications of cirrhosis. Measurement of the hepatic venous pressure gradient (HVPG) is the gold standard for assessing the presence of portal hypertension, but its invasiveness limits its clinical application. In this study we evaluated the relationship between LSM and HVPG, and the predictive value of LSM for clinically significant portal hypertension (CSPH) and severe portal hypertension in cirrhosis. Methods: LSM was performed with transient elastography in 59 consecutive cirrhotic patients who underwent hemodynamic HVPG investigations. CSPH and severe portal hypertension were defined as HVPG ≥10 and ≥12 mmHg, respectively. Linear regression analysis was performed to evaluate the relationship between LSM and HVPG. Diagnostic values were analyzed based on receiver operating characteristic (ROC) curves. Results: A strong positive correlation between LSM and HVPG was observed in the overall population (r2=0.496, P<0.0001). The area under the ROC curve (AUROC) for the prediction of CSPH (HVPG ≥10 mmHg) was 0.851, and the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for an LSM cutoff value of 21.95 kPa were 82.5%, 73.7%, 86.8%, and 66.7%, respectively. The AUROC at prediction of severe portal hypertension (HVPG ≥12 mmHg) was 0.877, and the sensitivity, specificity, PPV, and NPV at LSM cutoff value of 24.25 kPa were 82.9%, 70.8%, 80.6%, and 73.9%, respectively. Conclusions: LSM exhibited a significant correlation with HVPG in patients with cirrhosis. LSM could be a non-invasive method for predicting CSPH and severe portal hypertension in Korean patients with liver cirrhosis.

P017 : Patch test results patient with eczematous cheilitis

( Seok Hwan Jang ),( Sook Jung Yun ),( Jee Bum Lee ),( Seong Jin Kim ),( Seung Chul Lee ),( Young Ho Won ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2

Background: Cheilitis is an inflammatory reaction of the lips. Contact sensitization could be a common exogenous cause as the lips are exposed to lipsticks, toothpastes and topical medications. Objectives: We sought to investigate the frequency of allergic contact cheilitis from eczematous cheilitis patients. Methods: We indentified the patients had visited the department of dermatology, Chonnam National University hospital in Gwangju, between January 2004 and February 2013. Clinical characteristics (age, gender, symptoms, duration, etc) and past history were carefully evaluated. Results: Allergic contact cheilitis was diagnosed most commonly (25 patients, 44.6%) followed by endogenous cheilitis (11 patients, 19.7%) and irritant contact cheilitis (8 patients, 14.3%). However the causative factors were uncertain in 12 patients (21.4%). Among 56 patients, 41 revealed patch test positivity to one or more antigen (73.2%) which indicated a clinical relevance for the positive antigen in 25 patients of allergic contact cheilitis. Conclusion: The common cause of allergic contact cheilitis was related to lip cosmetics such as lipsticks and lip balms followed consumer product like toothpaste. Interestingly, nickel sulfate was the most common in positive patch test followed by fragrance mix and balsam of Peru. While it`s difficult to conclude a clinical relevancy, patients with chronic eczematous cheilitis should be patch-tested to identify the possible cause of allergic contact dermatitis.

Others : Exercise down-regulates SREBP-1c and PPARG expression on Liver of high-fat diet C57BL/6 mice (초)

( Jung Jun Park ),( Hong Soo Kim ),( Sae Hwan Lee ),( Soung Won Jeong ),( Sang Gyune Kim ),( Jae Young Jang ),( Young Seok Kim ),( Boo Sung Kim ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3(S)