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Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results
Moon-Jin Jeon,Young-Ho Cho,김은혁,Dong-Gyu Kim,Young-Joo Song,홍승범,Jonghee Bae,Jun Bang,Jo Ryeong Yim,Dae-Kwan Kim 한국우주과학회 2024 Journal of Astronomy and Space Sciences Vol.41 No.1
Korea Pathfinder Lunar Orbiter (KPLO) is South Korea’s first space exploration mission, developed by the Korea Aerospace Research Institute. It aims to develop technologies for lunar exploration, explore lunar science, and test new technologies. KPLO was launched on August 5, 2022, by a Falcon-9 launch vehicle from cape canaveral space force station (CCSFS) in the United States and placed on a ballistic lunar transfer (BLT) trajectory. A total of four trajectory correction maneuvers were performed during the approximately 4.5-month trans-lunar cruise phase to reach the Moon. Starting with the first lunar orbit insertion (LOI) maneuver on December 16, the spacecraft performed a total of three maneuvers before arriving at the lunar mission orbit, at an altitude of 100 kilometers, on December 27, 2022. After entering lunar orbit, the commissioning phase validated the operation of the mission mode, in which the payload is oriented toward the center of the Moon. After completing about one month of commissioning, normal mission operations began, and each payload successfully performed its planned mission. All of the spacecraft operations that KPLO performs from launch to normal operations were designed through the system operations design process. This includes operations that are automatically initiated post-separation from the launch vehicle, as well as those in lunar transfer orbit and lunar mission orbit. Key operational procedures such as the spacecraft’s initial checkout, trajectory correction maneuvers, LOI, and commissioning were developed during the early operation preparation phase. These procedures were executed effectively during both the early and normal operation phases. The successful execution of these operations confirms the robust verification of the system operation.
김대현,김문규,임성진 동의공업대학 2000 論文集 Vol.26 No.1
The purpose of this study is to determine the possibility of using as a fill material and cover soil, hardened up to a specific age by making a dosing such as slaked lime, bentonite into the sludge generated during waterworks treatment process with existing treatment system of a ocean dumping. For these reasons, this study carried out a basic physical property test, consolidation test, unconfined compression strength test, extraction test on heavy metals, X-ray diffraction analyzer, scanning electron microscope to determine a characteristic of modified waterworks sludge. In this case that waterworks sludge was modified by being mixed with slaked lime accounting for 10% of its total amount at the age of twenty eight day, the compression strength of the sludge was developed 1.0kgf/㎠ or over. This indicated that the sludge could be used as fill material and cover soil. The extraction test on waterworks sludge modified by slaked lime showed the below of KSP, TCLP standard. Estimation of coefficient of permeability as consolidation test showed less considerably in comparison with reported coefficient of permeability at the landfill site in Seoul Metropolitan area. For this reason, it was found that modified waterworks sludge could be used as fill material and cover soil. Accordingly if waterworks sludge was reused by hardening process, showing a more effecting in terms of economy, environment.
김문규,김대현 동의공업대학 2000 論文集 Vol.26 No.1
The model experiments were carried out to observe the variation of lateral earth pressure acting on the wall as vary the constraint of retaining wall, geometry of wall, and backfill width. For the experiments, a soil-box, model wall, and a rainer were designed and manufactured. The experiments were carried out with two different types of constraint on wall movement: i.e. first with completely fixed wall and second with movable wall depending on soil pressure. The measured lateral earth pressure was compared with that by an extended silo and wedge theories. The test results are summarized as follows: The measured lateral earth pressure approached to that from the extended silo theory as a narrower backfill width was used. Both experimental and theoretical results showed a good coincidence when the backfill width is Bc tan(45 -?? DS/2)H. But much deviated from that by an extended wedge theory. (원문을 참조하세요)
서정길,김찬희,배윤정,문호성,김근용,박희연,윤호동,김창훈,변대석,홍용기,박남규 한국어병학회 2003 한국어병학회지 Vol.16 No.3
Mastoparan B (MPB)는 벌독으로부터 정제된 양친매성α-helical 구조를 취하면서 14개의 아미노산 잔기로 구성된 염기성 항균성 펩타이드로서 여러 가지 생물막과 작용한다. 본 연구에서는 우리 나라 연안의 적조 (HABs, harmful algal blooms)를 일으키는 4종의 적조생물 (Alexandrium tamarense, Chattonella catenatum)에 대한 MPB의 살조효과를 조사하였다. MPB의 4종의 적조생물에 대한 살조효과는 31.3㎍/㎖에서 세포의 lysis또는 ecdysis와 같은 형태로 현미경으로 관찰할 수 있었다. 또한 MPB는 C. marina 및 C. polykridorides에 대해서 A. tamarense와 G. catenatum보다 더욱 강한 살조효과를 나타내었다. 이러한 MPB의 HABs에 대한 살조효과연구는 새로운 살조물질을 개발하기 위한 자료가 될 것으로 생각된다. Mastoparan B (MPB), an antimicrobial cationic peptide isolated from the venom of the hornet Vespa basalis, is a basic amphipathic a-helical peptide composed of fourteen amino acid residues. In this study, we have investigated the algicidal effect of MPB against hatmful algae blooms (HABs) casative Alexandrium tamarense, Chattonella marina, Cochlodinium polykrikoides and Gymnodinium catenatum. The algicidal effect of MPB showed in the concentration of 31.3 ㎍/㎖ to 500 ㎍/㎖ against 4 HAB species and observed cell lysis or cell ecdysis by microscopy. MPB reacted more sensitive to C. marina and C.polykrikoides than A. tamarense and G. catenatum. The algicidal study of MPB against HABs will provides much insight into development of new algicidal substances.
복강경담낭절제술에서 수술전 간담도신티그라피와 경구담낭조영술의 의의
문대혁(Dae Hyuk Moon),양승오(Seoung Oh Yang),이희경(Hee Kyung Lee),원경숙(Kyoung Sook Won),류진숙(Jin Sook Ryu),한동복(Dong Bok Han),박철민(Cheol Min Park),이문규(Moon Gyu Lee),박광민(Kwang Min Park),이승규(Sung Gyu Lee) 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.1
N/A 131I-6β-iodomethyl-19-norcholesterol(NP-59) has an advantage to assess adrenal dysfunction caused by adrenal cortical disorders. The aim of this study is to evaluate the clinical usefulness of NP-59 scintigraphy in each adrenral disease. Ten patients who did eleven NP-59 adrenal scintigraphies at Dong-A University Hospital from March 1990 to December 1996 were selected as the subject. Among the subject there were 5 cases of Cushing's syndrome, 2 cases of incidentaloma, 1 case of metastatic adrenal tumor, liver cirrhosis with hirsutism and hypertension respectively. Among 5 case of Cushing's syndrome, there were 2 cases of Cushing's disease, 2 cases of adrenal adenoma and 1 case of adrenal carcinoma. There are no disagreement between clinical diagnosis and scan finding in Cushing's syndrome. In 2 incidentaloma cases, even though one is interpretated as a functioning tumor, both of 2 cases could avoid unnecessary biopsy according to scintigraphy result. One case of hirsutism, clinically adrenal originated, revealed the normal scintigraphic hirsutism was extra-adrenal origin. One case of hypertension took the study to exclude the possibility of primary aldosteronism. Normal suppression scan finding revealed that primary aldosteronism did not exist in this case. In conclusion, NP-59 scintigraphy was very useful in diagnosis and differential diagnosis of Cushing's syndrome and it could avoid unnecessary biopsy in the incidental adrenal tumor.
Positive Glucose Breath Tests in Patients with Hysterectomy, Gastrectomy, and Cholecystectomy
( Dae Bum Kim ),( Chang-nyol Paik ),( Yeon Ji Kim ),( Ji Min Lee ),( Kyong-hwa Jun ),( Woo Chul Chung ),( Kang-moon Lee ),( Jin-mo Yang ),( Myung-gyu Choi ) 대한소화기학회 2017 Gut and Liver Vol.11 No.2
Background/Aims: This study aimed to investigate the prev-alence and characteristics of small intestinal bacterial over-growth (SIBO) in patients undergoing abdominal surgeries, such as gastrectomy, cholecystectomy, and hysterectomy. Methods: One hundred seventy-one patients with surgery (50 hysterectomy, 14 gastrectomy, and 107 cholecystectomy), 665 patients with functional gastrointestinal disease (FGID) and 30 healthy controls undergoing a hydrogen (H<sub>2</sub>)-methane (CH<sub>4</sub>) glucose breath test (GBT) were reviewed. Results: GBT positivity (+) was significantly different among the surgical patients (43.9%), FGID patients (31.9%), and controls (13.3%) (p<0.01). With respect to the patients, 65 (38.0%), four (2.3%), and six (3.5%) surgical patients and 150 (22.6%), 30 (4.5%), and 32 (4.8%) FGID patients were in the GBT (H<sub>2</sub>)+, (CH<sub>4</sub>)+ and (mixed)+ groups, respectively (p<0.01). The gastrectomy group had a significantly increased preference in GBT+ (71.4% vs 42.0% or 41.1%, respectively) and GBT (H<sub>2</sub>)+ (64.3% vs 32.0% or 37.4%, respectively) compared with the hysterectomy or cholecystectomy groups (p<0.01). During GBT, the total H<sub>2</sub> was significantly increased in the gastrectomy group compared with the other groups. Conclu-sions: SIBO producing H<sub>2</sub> is common in abdominal surgical patients. Different features for GBT+ may be a result of the types of abdominal surgery. (Gut Liver 2017;11:237-242)