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이해창(Lee Hae-chang) 한국항공우주연구원 2023 항공우주산업기술동향 Vol.21 No.2
UAM 시대에 대비하여 지난 5년간 세계 각국이 지원한 정책과 주요 UAM 기업별 개발 및 투자현황을 정리하였다. 특히, 기업별 현황에 대하여는 ‘22년 일정별 최신 이벤트들을 중심으로 상세하게 조사함으로써 각각의 개발 진척도를 정확히 진단하고자 하였다. 또한, 우리나라의 현황을 조사하여 제시함으로써 비교분석이 가능하도록 하였다. UAM 전망에 대하여는 외부 자료를 인용하여 달성 가능성을 예측하였고, 5년 전에 제시한 시장 전망 등 수치에 대하여도 변화가 있는지 조사하였다. The UAM policies supported by countries around the world and the status of the development and investment of each major UAM company over the past five years have been summarized. In particular, the status of each company was investigated in detail focusing on the latest events that occurred in 2022, so that each development progress could be accurately diagnosed. In addition, the current status of our country was investigated and presented to compare. Regarding UAM prospects, several data were cited and the possibility of achievement was predicted, and figures such as the market outlook presented five years ago were also investigated to see if there were any changes from the original data.
이해창(Hae-Chang Lee),서혜영(Hye-Young Seo),신동빈(Dong-Bin Shin),박용곤(Yong-Kon Park),김윤숙(Yoon-Sook Kim),지중룡(Joong-Ryong Ji),최희돈(Hee-Don Choi) 한국식품과학회 2009 한국식품과학회지 Vol.41 No.6
SFE법을 이용하여 딸기의 휘발성 향기성분을 추출하기 위한 시료의 적정 전처리 및 SFE 작동조건을 검토하였으며, SDE법 및 SE법 등의 추출방법과 휘발성 향기성분 조성을 비교하였다. 딸기 생시료, 동결건조시료, 그리고 생시료에 celite를 30, 70%를 혼합하여 제조한 시료를 이용하여 SFE 처리후 향기성분을 분석한 결과, 생시료에 celite를 70% 첨가하는 방법이 향기성분을 추출하는데 가장 효과적인 것으로 나타났다. 온도(40, 55℃)와 압력(3,000, 6,000 psi)을 달리하여 SFE 처리한 결과, 3000 psi, 55℃ 조건에서 alcohol류와 acid류의 추출효율이 증가하였으며, γ-dodecalactone의 함량도 3배 정도 높은 수준으로 나타났다. SDE법, SFE법 및 SE법 등의 추출방법별 딸기의 휘발성 향기성분을 분석한 결과, SFE법은 SDE법에 비해 추출한 휘발성 향기성분의 종류는 적지만 추출량이 비슷하면서 열분해 및 열변성이 발생하지 않아 딸기 고유의 향기에 가까운 향기패턴을 나타내었으며, 기호적으로 우수한 acid류가 다량 함유된 향기성분을 추출하기에 적합한 것으로 나타났다. In order to optimize the supercritical fluid extraction (SFE) conditions of volatile components from the strawberry, we conducted an evaluation of the sample preparation and SFE operating conditions. The analysis of the volatile components extracted by a variety of sample preparation protocols led to the identification of 30, 26, 30, and 34 volatile components in fresh, freeze-dried, 30% celite and 70% celite treatments, respectively. The 70% celite treatment was the most effective in extracting the volatile components from strawberry via SFE. Analysis of the volatile components extracted by a variety of SFE operating conditions yielded identifications of 34, 35, 34, and 35 volatile components at 3,000 psi (40, 50℃) and 6,000 psi (40, 50℃), respectively. The extraction yield of alcohols and acids, and the total volatile component contents, were highest under conditions of 3,000 psi and 55℃. Volatile components from the strawberry were extracted via SFE, simultaneous steam distillation and extraction (SDE), and solvent extraction (SE). The analysis of the volatile components extracted via different extraction methods resulted in the identification of 56, 34, and 32 volatile components in the SDE, SFE, and SE extracts, respectively. The total volatile component contents identified in the SDE, SFE, and SE extracts were 20.268±1.144, 21.627±1.215 and 2.476±0.177 mg/kg, respectively. The SFE extract evidenced higher contents of sweet flavors such as 2-methylbutanoic acid, 2-methylpropanoic acid, and hexanoic acid than the SDE and SE extracts. SFE proved to be the most appropriate method for the extraction of fresh volatile components from the strawberry.
다량의 복수를 동반하면서 CA 125가 상승한 난소의 경화성 간질종양
이해창 ( Hae Chang Lee ),김병륜 ( Byoung Ryun Kim ),이준석 ( Jun Seok Lee ),임법인 ( Beob In Lim ),김흥곤 ( Heung Gon Kim ),문형배 ( Hyung Bae Moon ),김훈영 ( Hoon Young Kim ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.1
Sclerosing stromal tumor (SST) is an uncommon benign tumor of the ovary, representing 2~6% of all stromal ovarian tumors. It is a distinct benign neoplasm that differs from fibromas, thecomas, luteinized tumors and steroid cell tumors. It presents most often with non-specific symptoms and tumor markers usually remain normal. However massive ascites is a rare symptom. We report a case of sclerosing stromal tumor with massive ascites and elevated CA 125 with brief review of literature.
파라미터 불확실성 및 시간지연을 갖는 레이더 김벌 안정화 시스템의 지연종속 퍼지 H<sub>∞</sub> 제에
김태식,이해창,이갑래,Kim, Tae-Sik,Lee, Hae-Chang,Lee, Kap-Rai 제어로봇시스템학회 2005 제어·로봇·시스템학회 논문지 Vol.11 No.11
This paper presents controller design method for nonlinear radar gimbal system with parameter uncertainty and time delay. In order to consider nonlinearity of gimbal bearing frictional torque, we firstly represent fuzzy model for the nonlinear gimbal system, which is achieved by fuzzy combination of linear models through nonlinear fuzzy membership functions. And secondly we propose a delay dependent fuzzy $H_\infty$ controller design method for the delayed fuzzy model with parameter uncertainty and design radar gimbal controller. The designed controller stabilize gimbal system and guarantee $H_\infty$ performance. A computer simulation is given to illustrate stabilized control performances of the designed controller.
VDL Mode 2 시스템 검증을 위한 운용시험장비 설계
배중원,김태식,이해창,Bae, Joong-won,Kim, Tae-sik,Lee, Hae-chang 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.3
VDL Mode 2 is one of air-to-ground VHF digital data link technologies. The VDL Mode 2 system is designed to be an air-to-ground subnetwork of the Aeronautical Telecommunication Network (ATN) using the AM(R)S band and it is organized according to the Open System Interconnection (OSI) model (defined by ISO). It can be used in ATS Applications especially for ATC communication such as CPDLC and ADS as well. And It is expected VDL Mode 2 replaces ACARS(Aircraft Communications Addressing and Reporting System) which has broadly been used for over 20 years. This paper presents the result of design of operational test equipments for the validation of VDL Mode 2 system under development in KARI.
이봄이 ( Bomee Lee ),이해창 ( Hae-chang Yi ),문용일 ( Yong-ii Moon ),오세종 ( Sejong Oh ) 한국유가공기술과학회 2018 Journal of Dairy Science and Biotechnology (JMSB) Vol.36 No.3
Kefir, which originates in the Caucasian mountains, is a cultured milk beverage produced by a combination of acidic and alcoholic fermentation. Kefir products are commonly used as food vehicles to deliver health-promoting materials including kefran and lactic acid bacteria to consumers. The aim of this study was to develop a freeze-dried starter culture without yeast and assess the suitability of kefir-like dairy products for the growth of lactic acid bacteria and the acidification of milk. Pasteurized whole milk (SNF 8.5%) stored at 25℃ was aseptically inoculated with starter cultures (0.002% w/v); it was kept at 25℃ until the pH attained a value of 4.6. Ten grams of the kefir-like product sample was diluted with 90 mL of 0.15% peptone water diluent in a milk dilution bottle, followed by uniform mixing for 1 min. Viable cells of Lactobacillus species were enumerated on modified-MRS agar (pH 5.2), with incubation at 37℃ for 48 h. Viable cells of Lactococcus species were enumerated on M17-lactose agar, with incubation at 32℃ for 48 h. The pH attained a value of 4.6 after fermentation for 9 h 30 min (Starter 1), 9 h 45 min (Starter 2), and 12 h (Starter 3). The viable cell count of Lactobacillus sp. and Lactococcus sp. was initially 10<sup>5</sup>∼10<sup>6</sup> CFU/g; it increased significantly to 10<sup>9</sup> CFU/g after 12 h of incubation. During the storage of the kefir-like products at 4℃ for 1 4 days, the total viable cell numbers were unchanged, but the pH decreased slightly. The consistency of the kefir products increased gradually during the storage. The organoleptic properties of the kefir products fermented using the new starter culture are more desirable than those of commercial kefir. These results suggest that the newly developed starter culture without yeast could be suitable for kefir fermentation.
중형수송기 Aircraft Classification Number 예측
정진덕,배중원,이해창,Chung, Jin-Deog,Bae, Joong-Won,Lee, Hae-Chang 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.3
ACN(Aircraft Classification Number) is allocated by marketing group during early stage of aircraft design phase and is a critical parameter to decide whether the designed aircraft can be landed or not in a certain airport. The loading on the main landing gear wheels, selection of main landing gear tire and estimation of ACNs for flexible and rigid pavements were done for the proposed medium-class aircraft. The estimated ACN values are compared with the similar class aircraft. And PCN(Pavement Classification Number) values of airport in Korea are surmmarized. Results showed that the currently proposed medium-class aircraft can land any airport in Korea.
이장호,강영신,배효길,이해창,Lee, Jangho,Kang, Youngsin,Bae, Hyogil,Lee, Hae-Chang 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.3
Tail wing is important to designing of civil aircrafts, because it is responsible for aircraft stability and control. Tail wing has a role in aircraft control and makes aircraft fly stably without any pilot control input. Also, designing of tail wing determine trim drag force in whole aircraft. Center of gravity(CG) of aircraft travels with various effects as placement of passenger's seats, location of cargo bay, etc. In designing horizontal tail volume, aircraft CG travel has to be considered to have margin so that it should be sized to provide adequate stability and control for the airplane's entire CG range throughout the flight envelope. Finally, it is essential to have sufficient elevator control to perform stall at forward CG for all flaps down configurations. Such stalls establish the FAR stall speed which airplane take-off and landing performance. This paper deals with the process for tail wing design regarding the aircraft CG travel and results for 95-seat type turboprop aircraft.