• Current Industrial and Technological Trends in Aerospace
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• v.5 no.2
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• pp.23-32
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• 2007

헬리콥터 주 로터 시스템은 헬리콥터 전체 성능을 좌우하고, 비행특성을 결정하는 핵심 구성품이다. 주 로터 시스템은 회전하면서 추력 및 조종력을 발생시키기 때문에 동적 밸런싱을 맞추는 것도 중요한 개발단계업무 중에 하나이다. 주 로터 시스템의 개발 과정에서 헬리콥터 비행시제 장착 전에 동적 밸런스 시험, 성능시험, 안정성 시험 등을 포함하는 훨시험(whirl test)을 수행하게 된다. 이 시험 수행을 위해 제작되는 시험장치가 훨타워(whirl tower)이다. 세계 유수 헬리콥터 회사들은 주 로터 훨시험을 위한 설비인 훨타워를 보유하고 있으며, 지속적으로 성능 개량 등을 통해 최신의 기술 및 장비를 적용하여 운영하고 있다. 본 논문에서는 대표적으로 사용되고 있는 해외 헬리콥터 회사들의 훨타워의 사례를 설명하고 설비의 기능을 기술함으로써 기술적 동향에 대하여 살펴보았다. 현재 한국형헬기개발사업(KHP)에서 구축중인 다목적 의 WTTF(whirl tower test facility) 요구조건 및 설계 현황에 대해서도 기술하였다. 당 연구원의 WTTF는 한국형기동헬기(KUH)의 주 로터 훨시험 및 내구성 시험을 위해 구축되고 있다. 본 시험설비는 연구개발용 시험과 양산용 시험을 모두 수행할 수 있도록 다목적으로 개발될 예정이다. 본 설비는 기존 해외 설비와는 차별화되어 다목적 시험을 할 수 있도록 설계가 진행중이며, 2008년12월에 구축 완료 예정이다.

• Journal of Advanced Navigation Technology
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• v.12 no.6
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• pp.539-547
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• 2008

In this paper, preliminary results for design of prototype ADS-ADS-B/TIS-B Validation Testbed (AVT) are described. Automatic Dependent Surveillance (ADS-B) is a novel surveillance concept using the Global Navigation Satellite System (GNSS) and a digital datalink. Air traffic information from ADS-B non-equipped aircraft is not acquired since ADS-B is a dependent surveillance. Traffic Information Service-Broadcast (TIS-B) provides surveillance data from Secondary surveillance Radar (SSR) for ADS-B non-equipped aircraft. AVT is based on ADS-B and TIS-B as an integrated platform for air traffic surveillance system for CNS/ATM.

• Journal of Advanced Navigation Technology
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• v.12 no.6
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• pp.554-558
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• 2008

In this paper, we show that the SIDMA(Self-organized Time Division Multiple Access) protocol using aviation surveillance data link now, designs to the ICAO DO 9816 documentation sequence. This protocol makes use of the VDL(VHF Data Link) Mode 4 and UAT(Universal Access Transceiver) system's MAC(Media Access Control) layer. We make sure of the simulation result and implementation of STDMA protocol program in accompany with the ICAO documentation sequence. This program operates the slot allocation and reservation with report rate when protocol transmits data and calculates slot address.

• Korean Journal of Oriental Medicine
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• v.14 no.2
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• pp.67-73
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• 2008

Background: Qigong is one of energy-healing intervention used to prevent and cure ailments and to improve health through regular practice. Although Qigong-neither itself nor its postulated mechanism of action-is within the paradigm of modern Western medical science, effects on the human body could be possible. Objectives: This study aims to know effect of Qigong training in a University student's physical, mental health and self-esteem. Method: There are 120 students who take a Yangsaengkigong(養生氣功) course in D University college of oriental medicine during four weeks beginning in April 10th 2008. I researched 41 of them trained about effect of Qigong training. Result: Qigong training made significant change in self-esteem measurement and SCL-90-R. And there wasn't significant change in KHP and happiness index. Conclusions: The depth study for the each Qigong is needed. Specifically, I think it should be a clinical studies and qualitative research methods for evaluation are needed.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06c
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• pp.381-386
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• 2008

전장환경에서 헬기는 헬기생존체계의 다양한 센서를 통하여 수집한 데이터를 기반으로 헬기에 대한 위협을 식별한다. 헬기의 성공적인 임무 수행 및 생존을 위하여 헬기에 대한 위협을 반복적으로 확인할 수 있는 시뮬레이터의 구현은 필수적이다. 본 논문에서는 (1) 헬기의 센서가 수신하는 위협요소를 정의하는 온톨로지 생성기, (2) 전장환경과 유사한 위협을 다양한 분포로 생성하는 위협자료 생성기 및 (3) 다양한 전장 시나리오에서 센서들이 수집한 데이터를 통합하여 위협의 방향과 정도를 사용자에게 실시간으로 보여주는 그래픽 화면표시기를 개발한다. 구현한 헬기의 다중센서 위협 시뮬레이터는 다양한 위협을 생성하는 자동 시나리오 생성기를 이용하여 위협 개체의 탐지 및 분류를 반복적으로 수행한다. 위협 시뮬레이터를 활용한 실험에서 동일한 위협에 대한 통합 정확도를 측정하였다.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2007.11a
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• pp.499-506
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• 2007

전장환경에서 헬기는 헬기생존체계의 다양한 센서를 통하여 수집한 데이터를 기반으로 헬기에 대한 위협을 식별한다. 헬기의 성공적인 임무 수행 및 생존을 위하여 헬기에 대한 위협을 반복적으로 확인할 수 있는 시뮬레이터의 구현은 필수적이다. 본 논문에서는 (1) 헬기의 센서가 수신하는 위협요소를 정의하는 온톨로지 생성기, (2) 전장환경과 유사한 위협을 다양한 분포로 생성하는 위협자료 생성기 및 (3) 다양한 전장 시나리오에서 센서들이 수집한 데이터를 통합하여 위협의 방향과 정도를 사용자에게 실시간으로 보여주는 그래픽 표시기를 개발한다. 구현한 헬기의 다중센서 위협 시뮬레이터를 이용하여 다양한 위협에 대한 탐지 및 분류 정확도를 측정한다.

• Journal of Information Technology Applications and Management
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• v.25 no.4
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• pp.185-196
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• 2018

This study investigates the social network among authors to improve the quality of Panel researches. Korea Health Panel (KHP), implemented by the collaborative work between KIHASA (Korea Institute for Health and Social Affairs) and NHIC (National Health Insurance Service) since 2008, provides a critical infrastructure for policy making and management for insurance system and healthcare service. Using bibliographic data extracted from academic databases, eighty articles were extracted in domestic and international journals from 2008 to 2014, April. Data were analyzed by NetMiner 4.0, social network analysis software, to identify the extent to which authors are involved in healthcare use research and the patterns of collaboration between them. Analysis reveals that most authors publish a very small number of articles and collaborate within tightly knit circles. Centrality measures confirm these findings by revealing that only a small percentage of the authors are structurally dominant, and influence the flow of communication among others. It leads to the discovery of dependencies between the elements of the co-author network such as affiliates in health panel communities. Based on these findings, we recommend that Korea Health Panel could benefit from cultivating a wider base of influential authors and promoting broader collaborations.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.03a
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• pp.39-44
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• 2008

In this paper, heat transfer coefficients were measured in a channel with one side dimpled surface. The sphere type dimples were fabricated and the diameter and depth of dimple was 16mm and 4mm, respectively. Two channel heights of about 0.6 and 1.2 time of the dimple diameter, two dimple configuration were tested. The Reynolds numbers based on the channel hydraulic diameter was varied from 30000 to 50000. The improved hue detection based transient liquid crystal technique was used in the heat transfer measurement. Heat transfer measurement results showed that high heat transfer was induced downstream of dimples due to flow reattachment. Due to the flow recirculation on the upstream side in the dimple, the heat transfer coefficient was very low. As the Reynolds increased, the overall heat transfer coefficients also increased. With same dimple arrangement, the heat transfer coefficients and the thermal performance factor were higher for the lower channel height. As the distance between dimples became smaller, the overall heat transfer coefficient and the thermal performance factor were increased.

• Korean Journal of Pharmacognosy
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• v.41 no.2
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• pp.136-140
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• 2010

This study was carried out to utilize non-toxic solvents instead of harmful solvents for the TLC(Thin Layer Chromatography) identification test of herbal medicines. It is recommended not to use harmful solvent such as chloroform at a viewpoint of clean analysis. In this study, we revised the identification test of 10 items in the Korea Pharmacopoeia(KP) and the Korean Herbal Pharmacopoeia(KHP) such as Cornus officinalis S. containing the harmful solvents on the developing solvent and established identification test that is utilized non-toxic solvents by HPTLC(High Performance Thin Layer Chromatography).

• Journal of Physiology & Pathology in Korean Medicine
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• v.32 no.5
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• pp.333-340
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• 2018

Gamiguibi-tang (GGBT) is a traditional herbal medicine generally used to treat anemia, insomnia, anxiety, and nervousness. GGBT is being commercially produced in the form of extract granule and the quality control methods are specified in the Korean Herbal Pharmacopeia (KHP). However, there is no method to simultaneously analyze compound preparations. In this study, a HPLC method was developed and validated for the simultaneous determination of marker compounds in GGBT. And the contents of marker components and biological activities of the commercial GGBT extract granules (GGBT-2 and GGBT-3) were compared with those of the GGBT decoction (GGBT-1). We confirmed the robustness of simultaneous analytical method by monitoring the contents of the commercial GGBT products and carrying out validation. The marker components of GGBT were geniposide ($8.03{\sim}12.70{\mu}g/mL$), paeoniflorin ($2.79{\sim}4.25{\mu}g/mL$) and glycyrrhizic acid ($5.06{\sim}6.30{\mu}g/mL$). DPPH and ABTS radical scavenging activities were 47.34~63.17% and 21.52~33.61% in the GGBT products concentration of $1,000{\mu}g/mL$, respectively. The GGBT products significantly decreased NO, iNOS and COX-2 production in lipopolysaccharide (LPS)-induced RAW 264.7 macrophages in a concentration-dependent manner. The GGBT-2 had higher contents of marker components and biological activities than GGBT-1 and GGBT-3. The research suggest that be used in developing quality control methods for enhancing the quality of herbal medicines.