한국형 기동헬기 개발을 위한 비행시험 계획 및 시험결과 개요

권혁준,박재영,Kwon, Hyuk-Jun,Park, Jaeyoung 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.3

The objective of this paper is to give a general understanding for the development flight test of Korean Utility Helicopter(KUH). This paper contains the contents of detailed flight test plan, the type of flight test, an introduction to main flight test area, and the overview of flight test results. At the beginning, more than 8,500 test points were identified for airworthiness certification to show the compliance for the KUH development requirements. However, the number of flight test points were optimized to 7,800 at the end. To accomplish the test objectives, about 860 flight test sorties had been performed, and more than 1,000 test sorties were consumed for trouble shooting. This paper also describes some major issues faced during development flight test phase.

좀나도히초미(Polystichum braunii (Spenn.) Fée) 포자체 증식을 위한 기내 포자 발아와 전엽체 배양 조건

권혁준,한지현,이철희,김수영,Kwon, Hyuk Joon,Han, Ji Hyun,Lee, Cheol Hee,Kim, Soo-Young 한국식물생명공학회 2017 식물생명공학회지 Vol.44 No.4

본 연구는 좀나도히초미(Polystichum braunii (Spenn.) $F{\acute{e}}e$)의 효율적인 증식방법을 규명하기위해 기내 포자발아, 전엽체 증식, 기회 포자체 형성 등 단계별 배양조건을 찾고자 수행되었다. 포자 발아율과 초기 전엽체 발달은 무기물 함량이 적은 Knop 배지에서 41.2%로 가장 높았다. 전엽체의 증식 및 생식기관 형성을 위한 배지는 2% sucrose가 포함된 2 MS 배지였다. 또한 배양토 종류와 혼합비율을 달리하여 전엽체를 기외 이식한 결과, 원예용 상토와 마사토를 2:1 혼합한 배양토에서 재배하였을 때 포자체 형성이 276.3개/$7.5m^2$로 가장 많았다. 반면, 피트모스가 포함된 조건에서는 전엽체 증식 및 포자체 형성이 억제되었다. 포자체 육묘는 상토 단용처리구에서 재배하였을 때 생육이 가장 왕성하였다. This study was conducted to investigate the optimal conditions for spore germination, prothallus propagation, sporophyte formation, and seedling growth in Polystichum braunii (Spenn.) $F{\acute{e}}e$. The rate of spore germination and early prothalium development was high in Knop (41.2%), which had low mineral content. The optimal medium for prothallus propagation and sexual organ formation was 2MS medium (2% sucrose). Among the various mixtures of cultivation soil (bedding soil, peat moss, perlite, and decomposed granite), a mixture of bedding soil and decomposed granite at a ratio of 2:1 (v:v) had a positive effect on sporophyte formation (276.3 ea/$7.5m^2$). The most efficient conditions for promoting the growth of sporophytes were pots filled with only bedding soil.

1986년 이전 국내 전염성 기관지염 바이러스의 확인

권혁준,이동우,안영기,윤종웅,김선중,Kwon, Hyuk-joon,Lee, Dong-woo,Ahn, Young-ki,Yoon, Jong-ung,Kim, Sun-joong 대한수의학회 2001 大韓獸醫學會誌 Vol.41 No.1

To clarify for the presence of infectious bronchitis virus (IBV) in Korea before 1986, in which the virus was first isolated, materials collected from chicken diagnostic consignments between 1980 and 1985 and propagated in chicken embryos or cell cultures were screened by the reverse transcriptase polymerase chain reaction (RT-PCR) targeted to the nucleocapsid gene of the virus. Among 11 samples examined, one sample (IBV-SNU80108) submitted in 1980 showed specific PCR product (281 bp). When the amplified product was sequenced, together with IBV vaccine virus H120 strain, and compared with the data for ten other IBV strains derived from the GeneBank, identities between IBV-SNU80108 and other strains in nucleotide and amino acid sequences ranged 96.3% to 63.7% and 96.4% to 69%, respectively. IBV-SNU80108 was distinct from H120 strain by showing 91.9% and 92.9% identities in the respective sequences. This data suggested that IBV genetically distinctive from other foreign IBV strains might be present before 1986 in Korea.

요각통으로 입원한 요추부 후만곡 환자 1례에 대한 증례보고

권혁준,김주원,류기준,김호준,이명종,Kwon, Hyeok-Joon,Kim, Joo-Won,Ryu, Ki-Jun,Kim, Ho-Jun,Lee, Myeong-Jong 척추신경추나의학회 2009 척추신경추나의학회지 Vol.4 No.2

Objectives : We already know the importance of stability and flexibility on the vertebra. It is important to keep the lumbar lordosis for stability and flexibility. We hope to reduce lower back pain and low extremity pain by changing the angle of the Lumbar Kyphosis through conservative treatment. We have evaluated the effect of conservative treatment with Saamchimbeop Pejeonggyeok by experimenting one patient suffering from Lumbar Kyphosis with lower back pain and low extremity pain. Methods : One patients were diagnosed as Lumbar Kyphosis through X-ray examination. We used conservative treatment, especially Pejeonggyeok Treatment to the patients and measured NRS((Numerical Rating Scale), rating scale for low back pain, low extremity pain and SLR(Straight Leg Raising) test and walking time in whole term of admission, and we also measured flexion, extension angle and lumbar kyphosis using lumbar x-ray lateral view after diganosing by Lumbar Kyphosis. Results and Conclusions : After treating conservative therapy, We figured out that the patient were on the mend, and we found out the angle change in flexion, extension and lumbar Kyphosis. These results suggest that Pejeonggyeok Treatment were effective to improved Lumbar Kyphosis and reduced the low back pain.

전역구조함수를 사용한 광각 2군 줌 렌즈의 설계

권혁준,임천석,Kwon, Hyuk-Joon,Rim, Cheon-Seog 한국광학회 2009 한국광학회지 Vol.20 No.6

본 논문에서는 다음과 같은 관점의 광각 2군 줌 렌즈 설계를 소개한다. 먼저전역최적화의 개념을 기초설계단계에서 도입하고, 이를 통해 현대의 수많은 데이터들을 체계적으로 계통화하고 단순화할 수 있는 설계방안을 제안한다. 구체적인 방안으로 전역설 계를 위해 전역구조함수라는 새로운 개념의 함수를 도입하였고 단순화시켰으며, 나아가 약간의 대수적인 혹은 수치적인 계산을 통해 전역 해 영역을 구하였다. 전역 해 영역은 전역최적화에 대응되는 개념이고 상용화된 설계프로그램들 보다 더 체계적이고 통찰적인 설계방향을 제시한다. We introduce a new design technique by treating a two-group zoom lens system with a wide angle of view. First, the concept of the global optimization is introduced in the initial design stage, and from this, the global design technique is completed by analyzing and summarizing large quantities of modern design data. That is, we define the global structure function to achieve a new conceptual design technique for global optimization. And the function is put in a simple form by referring lots of patent data, manipulated with other algebraic equations, and solved finally such that we obtain the global solution region. The global solution region corresponds to the global optimization and suggests insightful systematized directions for the design of two-group zoom lens systems. These directions are attractive compared to global optimization.

꿩고비(Osmunda cinnamomea var. forkiensis) 기내 포자체 재생에 영향을 미치는 배양부위와 배지구성물질

권혁준,신소림,이철희,김수영,Kwon, Hyuk Joon,Shin, So Lim,Lee, Cheol Hee,Kim, Soo-Young 한국식물생명공학회 2017 식물생명공학회지 Vol.44 No.4

본 연구는 꿩고비 포자체의 기내증식을 위한 배양재료 및 배지 구성물질을 구명하기 위해 수행되었다. 포자체의 유묘를 부위별로 나누어 활성탄 0.1%를 첨가한 1/2MS 배지에 다져서 배양한 결과, 근경에서 포자체 재생이 가장 우수하였다. 곱게 다진 근경을 농도를 달리한 MS 배지에 배양한 결과, 1/8MS 배지에서 포자체 형성이 가장 왕성하였으며, 2MS 배지에서는 배양한 절편이 모두 괴사하였다. 상기의 연구를 토대로 1/8MS 배지에 sucrose와 $NaH_2PO_4$의 농도를 조절하여 배양한 결과 sucrose 2%, $NaH_2PO_4\;50mg{\cdot}L^{-1}$에서 포자체 재생이 가장 왕성하였다. 이상의 연구결과, 활성탄 0.1%를 포함한 변형 1/8MS 배지(sucrose 2%, $NaH_2PO_4\;50mg{\cdot}L^{-1}$, agar 0.8%, pH 5.8)에서 포자체 재생이 가장 왕성하였다. This study was carried out to find culture materials (explant parts) and medium components (medium type, sucrose and $NaH_2PO_4$ concentration) for in vitro propagation of Osmunda cinnamomea var. forkiensis sporophyte. The results of study: chopped segments of leaf blades, stipes, rhizomes and roots were cultured on a 1/2MS medium supplemented with 0.1% activated charcoal. Among these explant types, only the rhizome segments produced young sporophyte, regenerating vigorously on a 1/8MS medium. Adjusting the sucrose concentration to 2% and supplement to $50mg{\cdot}L^{-1}\;NaH_2PO_4$ in the 1/8MS medium proved to be more efficient for plant regeneration. Consequently, the addition of 0.1% activated charcoal to a modified 1/8MS medium (2% sucrose, $50mg{\cdot}L^{-1}\;NaH_2PO_4$, pH 5.8 and 0.8% agar) yielded the highest sporophyte regeneration.

판타지동화의 개념, 범주, 유형에 대한 재검토

권혁준(Kwon, Hyug-Jun) 한국아동문학학회 2009 한국아동문학연구 Vol.- No.16

이 논문에서는 판타지동화에 대한 이론적 기초를 마련하기 위하여 판타지 동화의 개념과 범주, 유형을 탐구하였다. 판타지동화는 ‘비현실적인 인물이 등장하거나, 비현실적인 사건이 일어나는 동화, 혹은 초자연적인 시공간을 배경으로 펼쳐지는 동화’로 정의할 수 있다. 본고에서는 판타지의 범주와 유형을 구분하는 일차적인 기준을 ‘환상성의 정도’로 규정하고, 이를 기준으로 ‘유사 판타지’와 ‘본격 판타지’로 구분하였다. 판타지동화의 유형을 나누는 또 하나의 기준은 ‘현실세계와 비현실세계의 존재 방식’이다. 이 기준에 의하면 판타지동화는 ‘교통형 ‘1차세계형 판타지’, ‘2차세계형 판타지’로 구분할 수 있다.판타지’, 이 세상에는 수많은 판타지 작품들이 다양한 모습으로 존재하며 새로 운 형태의 작품이 산출될 수 있다. 그렇게 되면 여기서 논의한 판타지의 범주를 벗어나는 작품들이 또 발견될 수 있고, 귀납적인 연구의 특성상 우리는 또 다시 새로운 연구를 시작해야 할 것이다. This paper defines the definition, scope and the types of fantasy in childrens literature to make theoretical background. Fantasy in childrens literature can be defined as the literature which has unrealistic characters and events or has settings in supernatural time and space. In this paper, the primary standard for classifying the types of literatures is the degree of fantasy. Based on this standard, fantasy literatures are classified into quasi-fantaias and serious-fantaias. The secondary standard is the existing way in a real or unreal world, and this standard classifies them into transactional fantasy, primary world fantasy, and secondary world fantasy. Nowadays, numerous fantasy literatures exist in various ways, and new types of literary works are written. Therefore, some other literatures which do not fit into the discussed classification would be found. Then, that would be the time that we should start the new study and find the new rules again.

맥주폐수의 대체 유기탄소원 적용성 평가

권혁준(Hyeokjune Kwon),김성철(Sungchul Kim),장순웅(Soonwoong Chang) 대한환경공학회 2020 대한환경공학회 학술발표논문집 Vol.2020 No.11

인코넬 718 결정립 크기와 초음파 속도, 감쇄, 비선형 파라메터에 대한 실험적 고찰

권혁준 ( Kwon Hyeokjun ),조환정 ( Cho Hwanjeong ) 공군사관학교 2021 空士論文集 Vol.72 No.-

초음파를 이용한 비파괴적인 재료의 특성 평가는 파괴적인 평가 방법을 대체하는 것으로 주목을 받고 있다. 금속의 결정립 크기는 피로강도 등의 기계적 특성에 영향을 미치는 중요한 미세구조 특징이며. 결정립의 크기가 균질하지 않은 부품은 항공기용 가스터빈엔진과 같이 고가의 첨단장비를 손상시킬 수 있다. 본 연구는 선형 및 비선형 초음파 특성과 항공기용 가스터빈 엔진에 널리 사용되는 인코넬 718의 결정립 크기의 특성의 상관관계를 실험적으로 탐색한다. 먼저, 실험에 관련된 이론과 실험계획을 서술한다. 이어서, 열처리에 따른 인코넬 718 결정립 크기의 변화, 초음파 속도와 감쇄 측정결과, 비선형 파라메터 측정결과 순으로 실험결과를 설명한다. Nondestructive material evaluation using ultrasonics has received much of attention as an alternative to destructive methods. Grain size is an important microstructural features determining mechanical properties of metals including fatigue strength. A part with uneven grain size can cause severe damage to high-cost meachines like aircraft turbine engines. This study experimetally explores correlation of Inconel 718’s grain sze and linear and nonlinear ultrasonics features. First, it describes theories and experiment plans, followed by their results. The paper will discuss its meaning to nondestructive techniques to aircraft maintenance.

봉의 꼬리를 이용한 수림지 토양의 비소정화에 미치는유황분말과 구연산의 영향

권혁준 ( Hyuk Joon Kwon ),조주성 ( Ju Sung Cho ),이철희 ( Cheol Hee Lee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2014 한국환경복원기술학회지 Vol.17 No.1

This study was carried out not only to identify the optimum concentrations of sulfur powder and citric acid treated for improving arsenic absorption of Pteris multifuda known as hyperaccumulator of arsenic, but also to develop arsenic purification model in the forest soil. After applying sulfur powder (0, 30, 45, 60g·m-2) and citric acid (0, 200, 400, 800g·m-2) in the forest soil contaminated with heavy metals, P. multifuda was planted and cultivated for 16 weeks. And then the growth and arsenic contents of plants were analyzed. In the result of research, the growth of P. mulifuda, except plant width, cultivated in soils treated with sulfur powder and citric acid was relatively lower than control. The accumulated amount of arsenic in aerial parts of P. multifuda (1822.2 mg·kg-1) cultivated in soils treated with 200g·m-2 citric acid was improved 62.5% against the control. And the accumulated amount of arsenic per 1 m2 (20.1mg·m-2) was the greatest in 200g·m-2 citric acid treatment. Translocation rate (TR) was higher in all acid treatment compare to control, and was the best in 200g·m-2 citric acid treatment (0.95) especially. It showed that the arsenic absorbed in underground parts was transferred fast to aerial parts. Therefore, 200g·m-2 citric acid treatment in the soil is recommended for arsenic purification using P. multifuda.