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최상봉(Sang-Bong Choi),이재조(Jae-jo Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
This paper presents a methodology to calculate the daily load curve per city by taking into consideration a charging station for electric vehicles, which easily determines the effect of the load owing to the charging of electric vehicles in Seoul. In particular, we calculate the charging power of uncontrolled plug-in electric vehicles (PEVs) in terms of the daily running characteristics of vehicle travelling between homes and workplace, with respect to PEV charging stations in the city, according to the market share of PEVs. Furthermore, we calculate the load curve for the simultaneous charging strategy of controlled PEVs in terms of the vehicles’ daily running characteristics between homes and workplaces and a time-of-use (TOU) price plan of the Seoul Metropolitan Government under uncontrolled and controlled charging types. Thus, we are able to analysis the effect of the total existing electricity load and the abovementioned daily load on the grid. Because we can precisely determine the effect of the hourly charging load of PEVs on a power grid in Seoul using these study results, we can establish a PEV charging load management plan to prevent power grid reinforcement and expansion while satisfying the overload constraint of the power grid in Seoul using an appropriate TOU price plan.
동적 라우팅 알고리즘의 신뢰성 향상을 위한 최단 경로 설정 알고리즘
조태환(Tae Hwan Cho),김지원(Ji Won Kim),김병조(Byoung Jo Kim),윤완오(Wan Oh Yoon),최상방(Sang Bang Choi) 한국정보과학회 2011 정보과학회논문지 : 정보통신 Vol.38 No.6
네트워크 토폴로지의 일부분에 변화가 생겼을 때, 효율적으로 최단경로를 설정 할 수 있는 대표적인 알고리즘으로 DSPT(Dynamic Shortest Path Tree)가 있다. 그러나 링크 비용이 증가하는 경우 DSPT 증가 알고리즘은 잘못된 최단경로를 계산한다. 따라서 본 논문에서는 DSPT 증가 알고리즘을 개선하여 신뢰성 있는 최단경로를 계산하는 P-DSPT(Precise-Dynamic Shortest Path Tree) 알고리즘과 RDSP(Reliable Dynamic Shortest Path) 알고리즘을 제안한다. 제안된 알고리즘의 성능을 평가하기 위해서 DSPT, 다익스트라 알고리즘 등과 성능을 비교하였으며, 최대 17%의 성능 향상이 있었다. DSPT algorithm is well known for searching altered SPT efficiently as a cost of link is changed. But DSPT algorithm is wrong for some cases. So we will show this with an example, and propose P-DSPT(Precise-Dynamic Shortest Path Tree) and RDSP(Reliable Dynamic Shortest Path) that is a new DSPT algorithm. The result of an evaluation shows that overall performance of the proposed algorithm is improved a maximum of 17% compared with DSPT and well-known Dijkstra algorithm.
신뢰성 있는 기동 항적 추적을 위한 다중 레이더 융합 알고리즘
조태환 ( Tae Hwan Cho ),이창호 ( Chang Ho Lee ),김진욱 ( Jin Wook Kim ),원인수 ( In Su Won ),조윤현 ( Yun Hyun Jo ),박효달 ( Hyo Dal Park ),최상방 ( Sang Bang Choi ) 한국항행학회 2011 韓國航行學會論文誌 Vol.15 No.4
레이더를 이용한 항적 융합 알고리즘은 반드시 필요하며, 이를 통해서 높은 신뢰성을 확보할 수 있다. 본 논문에서는 칼만필터 보다 성능이 좋다고 알려진 IMM(Interacting Multiple Model) 필터를 이용하여 다중 레이더 융합 알고리즘을 제안하였다. 분산형 융합 방식을 적용하였고, 부필터 3개, 주필터 1개를 이용하였다. 성능분석은 등속운동, 가속운동, 선회 등 항공기 기동을 묘사한 가상의 레이더 데이터를 이용하여 분석하였다. 성능분석 결과, 항공기가 기동하는 구간에서도 좋은 추적 성능을 보였다. Data Fusion algorithm is essential in Target Detection using radar, and it has more reliability. In this paper, Multi Radar Fusion algorithm using IMM(Interacting Multiple Model) filter is suggested. This well-known IMM filter has better performance than Kalman filter has. In this simulation, Distributed Data Fusion process was applied, and three sub-filters and one main filter were employed. In addition, this simulation was evaluated by virtual radar data which include constant velocity, constant accelerate, turn rate. The result of an evaluation shows better performance in the maneuvering section of aircraft.
냉장고용 롤-플레이트형 휜-관 열교환기의 성능에 관한 연구
안성준(Sung-Jun Ahn),김종수(Jong-Su Kim),권오붕(Oh-Boong Kwon),박영종(Yong-Jong Park),하영주(Young-Ju Ha),최상조(Sang-Jo Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Recently, a study on condensers for refrigerators has focused on new model which will cost less and will be more efficient. Some widely used condensers for domestic refrigerators are wire-and-tube type condenser, hot-wall type condenser, and spiral type condenser. Some companies which use the spiral type condenser at the moment try to develop a new type condenser which will cost less and will be as efficient as the spiral type. The new type condenser consists of a steel tube, steel plates and louver fins attached to the tube. The tube and the plate are bent into a single-passage serpentine shape.
진동형 히트파이프를 이용한 환기배열 회수용 미니채널 열교환기의 성능 실험
최우석(Woo-Seok Choi),임용빈(Yong-bin Im),최상조(Sang-Jo Choi),김종수(Jong-Soo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In order to prevent deterioration of indoor air quality, it is needed to install a suitable ventilation facility equipped with heat recovery devices. In this study, the heat recovery ventilator was developed using a concept of pulsating heat pipe (PHP). Air flow rate was 300-1200 CMH, and its frontal air velocities were 0.5-1.5 m/s. The heat pipe type heat exchanger was serpentine type and it was composed of extruded flat aluminum tube with 6 channels (2.5 × 2.75 ㎜) and louvered fin. The heat transfer area was 9.05 ㎡, working fluid was R-134a and charging ratio (Φ) was 40% in volumetric. Heat recovery rate and pressure drop, j-factor, f-factor were major concern of this study. As a result, heat recovery rate was 1140 W(Φ: 40%, air velocity: 1.5 m/s). Also, the performance of heat exchanger was evaluated by using j-factor and f-factor method.
대장내시경에서 궤양의 특성에 따른 베체트 장염의 임상경과
김민철 ( Min Cheul Kim ),신성재 ( Sung Jae Shin ),임선교 ( Sun Gyo Lim ),이경록 ( Kyung Rok Lee ),우학 ( Hak Woo ),최상조 ( Sang Jo Choi ),조정수 ( Jung Soo Jo ),엄중호 ( Jung Ho Eum ),차동엽 ( Dong Youb Cha ),황재철 ( Jae Chul H 대한장연구학회 2010 Intestinal Research Vol.8 No.1
Background/Aims: Intestinal involvement with bleeding and perforation is one of the main causes of morbidity and mortality in patients with Behcet’s disease (BD); however, the clinical course of intestinal BD has not been defined. The aim of this study was to determine the clinical course of intestinal BD based on the characteristics of ulcers visualized during colonoscopy. Methods: We retrospectively reviewed the medical records and colonoscopic findings of 41 patients with intestinal BD. All patients were classified into subgroups according to ulcer depth, size, and number, and we analyzed the clinical manifestations, subset type of BD, medications, surgical procedures, and relapse rate among the subgroups. Results: The median age at the time of diagnosis was 38 years (range, 18-74 years); 25 patients were females (M:F=1:1.56). Abdominal pain (n=40), diarrhea (n=27), and RLQ tenderness (n=21) were common symptoms. The number of complete, incomplete, and suspected types was 3, 17, and 21, respectively. In an analysis according to ulcer depth, the rate of steroid use and intestinal surgeries was more frequent in the deep ulcer group compared with the aphthous and shallow ulcer groups (50.0% vs. 0% vs. 17.6%; P=0.012; 42.9% vs. 0% vs. 23.5%: P=0.013) The rate of steroid use and relapse tended to be higher as the size of the ulcer increased; however, there was no difference in the rates of steroid use, surgeries, and relapse based on the number of intestinal ulcers. Conclusions: The prognosis was worse in patients with intestinal BD who have deeper and larger ulcers. Therefore, we suggest that such patients need to be treated aggressively. (Intest Res 2010;8:40-47)
임상증상 없이 다발성 장기전이를 동반한 악성 갈색세포종 2예
최상조 외 중앙대학교 의과대학 의학연구소 2005 中央醫大誌 Vol.30 No.3·4
Pheochromocytomas are chromaffin cell tumors usually arising in the adrenal glands and characterized by excessive production of catecholamines, often leading to increased blood pressure and symptoms of catecholamine excess. The clinical manifestations of the pheochromocytomas are variable. Some of the clinical symptoms of pheochromocytomas are caused by mass effect of the tumor or near organ metastasis and in some cases there are no symptoms. Less than 10% of all pheochromocytomas are malignant, but the malignancy cannot be determined from the histologic appearance. Malignancy is indicated when there are multiple or distant metastasis or when there is local invasion. We report two unusual cases of malignant pheochromocytoma with multiple metastases but no classic clinical symptom.