CACB를 적용한 다중 반송파 CDMA전송방식에 관한 연구

고재훈,홍인기 경희-다반 ASIC 설계교육센터 2005 경희-다반 ASIC센터 논문집 Vol.6 No.-

차세대 무선통신에서 수백 Mbps의 다양한 전송률을 갖는 멀티미디어 서비스를 지원하기 위하여 다중 부호 전송 방식을 적용한 다중 반송파 시스템(Multi-Code Multi-Carrier CDMA : MC- MC- CDMA)이 제안되었다. 본 논문에서는 MC-MC-CDMA가 갖는 단점 중 하나인 높은 PAPR(Peak to Average Power Ratio)문제를 해결하기 위하여 다중 부호 방식 대신 CACB(Constant Amplitude Coding for Bi-orthogonal)를 적용하였다. 또한 CACB가 가지는 파형부호화(waveform coding)효과로 인한 성능향상과 다중 경로 페이딩환경에서 MC-COMA와의 성능비교를 통하여 CACB MC-CDMA가 가지는 주파수 다이버시티 이득을 BER로 분석하였으며 그 수율 (throughput)을 비교, 분석하였다.

지하채굴공동 안정성 해석을 위한 암반등급 분류법의 비교 연구

양훈재,고진석 조선대학교 생산기술연구소 2007 生産技術硏究 Vol.29 No.2

It is compared with the stability of pillar to make a selection of numehcal analysis by Hoek-Brown Model and Mohr-Coulomb Model at FDM analysis and so presented proper formation model. The RMi system is based on defined inherent parameters of the rock mass and is obtained by combining the compressive strength of intact rock and a jointing parameter and an improved method to determine the constants m and s in the Hoek-Brown failure chterion for rock masses. By using numehcal analysis program for the accuracy of constants m, s calculated by RMi in Hoek-Brown failure criteron also compared with the constants calculated by RMR. The reliability of constants calculated by RMi is confirmed. The result of analysis to select proper numehcal analysis model on this study site is comparatively high stress level and Hoek-Brown model is possible for a safe design. The parameter calculated by RMi is almost equal to the parameter calculated by RMR.

소양호의 어류군집 동태

최재석,이광열,장영수,고명훈,권오길,김범철 한국어류학회 2003 韓國魚類學會誌 Vol.15 No.2

2001년 4월부터 2002년 9월까지 소양호의 어류군집 동태를 조사한 결과는 다음과 같다. 조사된 어류는 총 11과 38종이었다. 한국 고유종은 P. tenuicorpus, C. splendidus, S. gracilis majimae, S. japonicus coreanus, H. mylodon, G. brevibarba, M. yaluensis, M. longidorsalis, C. koreensis, C. rotundieaudata, S. microdorsalis, P. koreanus, L. andersoni, C. herzi, O. patycephala 등 15종(40.54%)이었다. 우점종은 Z. platypus(39.60%), H. olidus(39.47%), S. gracilis majimae(12.24%), S. japonics coreanus(2.11%), P. fulvidraco(1.48%), L. macrochirus(1.40%) 등이었다. 채집된 어종들의 생체량을 보면 Z. platypus가 19.48㎏, H. olidus로 8.75㎏, C.cuvieri 7.42㎏, L. maeroehirus 7.39㎏, H. labeo 6.85㎏의 순으로 나타났다. 소양호에서 확인된 도입종은 A. japonica, H. eigenmanni, H. olidus, P. altivelis, C. urotaenius, R. giurinus, T. brevispinis, C. carpio(Israeli type), c. euvieri, Onchorhynchus mykiss, L. macrochirus, M. salmoides, I. puntatus 등 13종이었다. 이 중 C. carpio(Israeli type), C. cuvieri, Onchorhynchus mykiss, L macrochirus, M. salmoides, I. puntatus는 국외종이며, A. japonica, H. eigenmanni, H. olidus, P. altivelis, C. urotaenius, R. giurinus, T. brevispinis 등은 국내 다른 하천ㅇ로부터 유입된 종이다. The dynamics of the fish community in Lake Soyang, Korea, was investigated from April 2001 to September 2002. During the surveyed period 38 species belonging 11 families were collected. There were 15 Korean endemic species 39.47%, including Pseudopungtungia tenuicorpus, Coreoleuciscus splendidus, Squalidus gracilis majimae, S. japonicus coreanus, Hemibarbus mylodon, Gobiobotia brevibarba, Microphysogobio yaluensis, Microphysogobio longidorsalis, Iksookimia koreensis, Iksookimia rotundicaudata, Silurus microdorsalis, Pseudobagrus koreanus, Liobagrus andersoni, Coreoperca herzi, and Odontobutis platycephala. Dominant species were Zacco platypus (39.60%), Hypomesus olidus (31.70%), Squalidus gracilis majimae (12.24%), Squalidus japonicus coreanus (2.11%), Pseudobagrus fulvidraco (1.48%) and Lepomis macrochirus (1.40%). The biomass of collected fishes were Zacco platypus (19.48 ㎏), Hypomes olidus (8.75 ㎏), Carassilus cuvieri (7.42 ㎏), Lepomis macrochirus (7.39 ㎏) and Hemibarbus labeo (6.85 ㎏). Of the 13 introduced fishes in Lake Soyang Cyprinus carpio (israeli type), Carassius cuvieri, Onchorhynchus mykiss, Lepomis macrochirus, Micropterus salmoides and Ictalurus puntatus were originated from foreign countries but Anguilla japonica, Hemiculter eigenmanni, Hypomesus olidus, Plecoglossus altivelis, Chaenogobius urotaenius, Rhinogobius giurinus. Thridentiger brevispinis were introduced from other native river systems.

규칙적인 유산소성 운동이 비만아동들의 신체구성 및 호흡순환기능에 미치는 영향

김태운,신군수,김종인,이광무,김성헌,안병철,고기준,한재웅,이재규 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-

The purpose of this study was to examined the effect of supervised regulary aerobic exercise program with cardiorespiratory function of obese children. The subjects were 16 obese Childrens(elementary school 4∼5 grade), and engaged in regulary aerobic exercise program for 9 weeks(5 days/week, 100 min/day, 60∼70% HRmax) with mountain climbing, basketball and football. The items of cardiorespiratory function measured VEmax, HRmax, RQmax, VCO₂max, VCO₂max, VCO₂max/kg and BFmax after treadmill exercise load. The conclusion of this study was as follows ; 1. In body composition, there were significant decrease(P<0.001) after aerobic exercise for 9 weeks in body weight, percent body mass index 2. In cardiorespiratory function, there were significant increase(P<0.001) after aerobic exercise for 9 weeks in VEmax and VCO₂max by treadmill exercise load. 3. In cardiorespiratory function, there were significant increase(P<0.001) after aerobic exercise for 9 weeks in VO₂mex and RQmax by treadmill exercise load. 4. In cardiorespiratory function, there were significant increase(P<0.001, P< 0.01) after aerobic exercise for 9 weeks in VO₂max/kg and BFmax by treadmill exercise load.

여중생들의 신체조성과 심폐기능 및 심박수 회복율에 관한 비교 연구 : 비만 여중생과 정상 여중생을 중심으로

김태운,신군수,김종인,이광무,김성헌,안병철,고기준,한재웅,이재규 釜山大學校 附設 體育科學硏究所 1996 體育科學硏究所 論文集 Vol.12 No.-

The purpose of this study was to compare and analyze the relation between body composition, cardiorespiratory functions and percent heart rate recovery in obese and normal middle school female students. We used total of 12 middle school female students(3rd grade) as subject and devided them into two groups : The measurement items of cardiorespiratory functions were HR, VE, RQ, VO₂, VCO₂, VO₂/kg, O₂pulse, VE/VO₂, VE/VCO₂, before and after treadmill exercise load. The statistical analysis were M±SD and t-test for groups(α=.05) using ?? statistical package. The conclusion of this study was as follows ; 1. In 5 items(FM, LBM, %Fat, TBW, BMI) all of body composition, obese group has been significantly higher than normal group(P<0.01). 2. In heart rate and VO₂ of resting(before exercise loads) cardiorespiratory functions, normal group has been significantly higher than obese group(P<0.05). 3. In VEmax of cardiorespiratory functions after exercise loads, obese group has been significantly higher than normal group(P<0.05), and in VO₂max, obese group has been significantly higher than normal group(P<0.01). 4. In 1, 3, 5 minute percent recovery all of percent heart rate recovery after exercise loads, normal group has been higher than obese group but there was no statistical significant difference.

Scleral Lens Applications Focused on Korean Patients with Various Corneal Disorders

Ko Eun Lee(Ko Eun Lee),Su Young Moon(Su Young Moon),Sanghyu Nam(Sanghyu Nam),Joon Hyuck Jang(Joon Hyuck Jang),Jae Yong Kim(Jae Yong Kim),Hungwon Tchah(Hungwon Tchah),Hun Lee(Hun Lee) 대한안과학회 2023 Korean Journal of Ophthalmology Vol.37 No.2

Purpose: We aimed to report on the clinical outcomes of scleral lens applications in Korean patients with various corneal disorders. Methods: This retrospective review was conducted for 62 eyes of 47 patients who had been fitted with scleral lenses for variouscorneal disorders. The patients were referred for inadequate spectacle-corrected visual acuity and rigid gas permeable(RGP) or soft contact lens intolerance. Uncorrected visual acuity, habitually corrected visual acuity, best lens-corrected visualacuity, topographic indices, keratometry indices, and lens parameters were evaluated. Results: Twenty-six eyes of 19 patients with keratoconus were enrolled. Other conditions included corneal scar (13 eyes of12 patients), phlyctenules (three eyes), laceration (four eyes), chemical burn (one eye), keratitis (one eye), Peters’ anomaly (oneeye), fibrous dysplasia (one eye), ocular graft-versus-host disease (two eyes of one patient), irregular astigmatism (18 eyes of12 patients), and corneal transplant status (five eyes of four patients). The mean topographic values of the eyes include flatkeratometric value (43.0 ± 6.1 diopters [D]), steep keratometric value (48.0 ± 7.4 D), and astigmatism (4.9 ± 3.6 D). Of the eyesfitted with scleral lenses, best lens-corrected visual acuity (0.10 ± 0.22 logarithm of the minimum angle of resolution [logMAR])was significantly better than the habitually corrected visual acuity (0.59 ± 0.62 logMAR, p < 0.001). Conclusions: Scleral contact lenses are a good alternative for patients with corneal abnormalities and those who are intolerableto RGP contact lenses, resulting in both successful visual outcomes and patient satisfaction, especially concerning keratoconus,corneal scar, and corneal transplant status.

A Study on Basic Data Investigation for Conceptual Design of ILW Storage Containers And Facilities by Decommissioning of NPP

Jae-Hun Ko,Duk-Woon Jung,Dong-Gyu Lee 한국방사성폐기물학회 2021 한국방사성폐기물학회 학술논문요약집 Vol.2021 No.11

SHIELDING ANALYSIS OF DUAL PURPOSE CASKS FOR SPENT NUCLEAR FUEL UNDER NORMAL STORAGE CONDITIONS

Ko, Jae-Hun,Park, Jea-Ho,Jung, In-Soo,Lee, Gang-Uk,Baeg, Chang-Yeal,Kim, Tae-Man Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.4

Korea expects a shortage in storage capacity for spent fuels at reactor sites. Therefore, a need for more metal and/or concrete casks for storage systems is anticipated for either the reactor site or away from the reactor for interim storage. For the purpose of interim storage and transportation, a dual purpose metal cask that can load 21 spent fuel assemblies is being developed by Korea Radioactive Waste Management Corporation (KRMC) in Korea. At first the gamma and neutron flux for the design basis fuel were determined assuming in-core environment (the temperature, pressure, etc. of the moderator, boron, cladding, $UO_2$ pellets) in which the design basis fuel is loaded, as input data. The evaluation simulated burnup up to 45,000 MWD/MTU and decay during ten years of cooling using the SAS2H/OGIGEN-S module of the SCALE5.1 system. The results from the source term evaluation were used as input data for the final shielding evaluation utilizing the MCNP Code, which yielded the effective dose rate. The design of the cask is based on the safety requirements for normal storage conditions under 10 CFR Part 72. A radiation shielding analysis of the metal storage cask optimized for loading 21 design basis fuels was performed for two cases; one for a single cask and the other for a $2{\times}10$ cask array. For the single cask, dose rates at the external surface of the metal cask, 1m and 2m away from the cask surface, were evaluated. For the $2{\times}10$ cask array, dose rates at the center point of the array and at the center of the casks' height were evaluated. The results of the shielding analysis for the single cask show that dose rates were considerably higher at the lower side (from the bottom of the cask to the bottom of the neutron shielding) of the cask, at over 2mSv/hr at the external surface of the cask. However, this is not considered to be a significant issue since additional shielding will be installed at the storage facility. The shielding analysis results for the $2{\times}10$ cask array showed exponential decrease with distance off the sources. The controlled area boundary was calculated to be approximately 280m from the array, with a dose rate of 25mrem/yr. Actual dose rates within the controlled area boundary will be lower than 25mrem/yr, due to the decay of radioactivity of spent fuel in storage.

A Stable Black-Start Strategy for a Stand-Alone DC Micro-Grid

Jae-Hun Cha,Yoon-Tak Han,Kyung-Won Park,Jin-Hong Oh,Tae-Seong Choi,Jae-Hun Ko,Philemon MAHIRANE,Jae-Yun An,Jae-Eon Kim 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1

Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.

Radiation Shielding Evaluation for IP-2 Transport Container Including Activated Cutting Waste of KORI Unit 1 RV/RVI

Jae-Hun Ko,Duk-Woon Jung,Dong-Kyu Lee,Young-Hwan Hwang 한국방사성폐기물학회 2018 한국방사성폐기물학회 학술논문요약집 Vol.2018 No.05