초등학생의 체력 요소간 상관 연구

박익렬,이동규 대한스포츠의학회 2003 대한스포츠의학회지 Vol.21 No.1

The purpose of this study was to investigate the correlation among the physical fitness factors in 6th grades elementary student. In a group of 534 healthy elementary school subject(composed of 283 male and 251 female). The student's physical fitness measurement consisted in 7 test items; muscular strength, muscular endurance, cardiorespiratory endurance, flexibility, muscle power, speed, % body fat. All data were analyzed by Correlation Analysis of SPSS/PC + 10.0, accepting level for all significances was above α=0.05. The results of this study were as follows: Male student group showed significantly differences muscular endurance, cardiorespiraory endurance, muscle power and speed than female student group, excepting flexibility in physical fitness factors. In the correlation among total physical fitness factors, there were a positive correlation between speed and cardiorespiratory endurance, speed and muscular endurance, but the correlation between % body fat and cardiorespiratory endurance, % body fat and speed, % body fat and muscular endurance was negative correlation. % Body Fat had an negative effect on physical fitness. Female student group showed lower correlation that male student group among the physical fitness factors.

치과용 Titanium 합금의 부식거동

박익민,김형일,최석규 大韓齒科器材學會 1991 대한치과재료학회지 Vol.18 No.2

Ti and Ti alloys are used in the dental field because of its high strength-to-density ratio, good fracture properties, corrosion resistance, and excellent biocompatibility. Corrosion characteristics of the cast pure Ti, Ti-6Al-4V, Ti-5Al-2.5Sn, have been investigated in 1% NaCl solution (37℃) and 40% CaCl₂solution (room-temperature) by means of Potentiodynamic polarization method. Corrosion potentials and corrosion current density of Ti alloys were compared to the Co-Cr alloy. The results are as follows: 1. The corrosion resistance of Ti-5Al-2.5Sn alloy was higher than pure Ti, Ti-6Al-4V alloy, Co-Cr alloy in the 37℃, 1% NaCl solution. But in the 40% CaCl₂solution(room-temperature), the corrosion resistance decreases in the order of Ti-6Al-4V, pure Ti, Ti-5Al-2.5Sn alloy. 2. The corrosion product (Ti₂O₂Cl₄) was formed on the corroded surface of Ti alloys in the 1% NaCl and 40% CaCl₂solution.

치과교정용 초탄성 Nitinol 선재의 피로특성

최석규,박익민,김형일 大韓齒科器材學會 1992 대한치과재료학회지 Vol.19 No.2

Nickel-titanium(NiTi) alloy wires are now widely used in the medical field because of their unique shape memory effect and superelasticity. The purpose of this study is to investigate the effects of mechanical fatigue and thermal cycling fatigue in orthodontics NiTi wire. The fatigue test was performed by three point bending fatigue test(No. of 4000, 8000, 12000, 16000) and tension-compression fatigue test(No. 1000, 2000, 3000, 4000) and thermal cycling fatigue test(No. 500, 1000). The results were as follows : 1. Strength, orthodontic force and transformation temperature(As, ??) were decreased with increasing number of fatigue cycle due to the coarsening of precipitations and increased density of dislocations. 2. Orthodontic force was slightly increased with number of cycle in thermal cycling fatigue due to the cohesion of precipitations and high density of dislocations.

터미날의 效率的 運營을 위한 異機種間의 인터페이스에 관한 硏究

金益均,尹亨老,朴圭泰 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2

The current study provides an efficient method connecting the free-selected terminal among the divergent terminals, which may fit best in the various business operation characteristics, to existing host computer. More specifically, the review of network components has been made to control interface between the computer and the terminal of different type, and the analysis of NETWORK PROTOCOL controlling interface also has been made. For the better compatibility, the modification has been made between the host computer and the terminal of different type to operate properly in the general-purpose NETWORK PROTOCOL which differ from the existing host computer.

폐석재와 석분을 사용한 식생블럭 제품 개발

성찬용,류능환,연규석,윤준노,김영익,남기성,노경희,박일순 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구는 폐석재와 석분을 사용하여 친환경적인 식생블럭 제품을 개발하기 위하여 폐석재의 입경과 석분의 첨가량을 각각 3종류씩 총 9종류의 식생블럭에 대하여 단위중량, 공극율, 투수량, 압축강도, 쪼갬인장강도, 휨강도, 내산성, 알카리농도에 대하여 구명하였다. 단위중량, 강도, 내산성은 골재의 입경이 작을수록 석분의 혼입량이 많을수록 크게 나타났으며, 공극율과 투수량은 작게 나타났다. 강도는 중성화 처리 유무에 따라 4∼5% 정도의 미소한 차이가 나타났다. 알카리 농도는 중성화 약품처리, 수중용출, 야외폭로 순으로 효과가 크게 나타났으며, 이는 식생블럭의 중성화 방법 선택에 매우 중요한 내용이라 할 수 있다. 또한, 식생상태는 공극율과 골재의 입경이 큰 식생블럭이 생육에 유리한 것으로 나타났다. This study was performed to develop the environment-friendly plantable block and to evaluate unit weight, void ratio, permeability, strength, acid-resistance and value of pH by the change of the grading of waste stone and the addition amount of stone dust. The unit weight, strength, acid-resistance is increased with small size of waste stone with increase of the addition amount of stone dust. But, the void ratio and permeability is decreased. The strength of neutral plantable block is decreased approximately 4-5% than that of the normal plantable block. The decreased effect of pH increased in order to neutral treatment, underwater leaching and field exposure. It is very important contents in neutral method selection of plantable block. Also, the planting state is grown rapidly with increase of the void ratio and of the waste stone size, approximately.

유도 '되치기 본'의 개선 방안에 관한 연구

김의환,김도준,김규수,김관현,김종달,최종삼,조용철,박순진,윤익선,안병근,정 훈,김미정,한성철 龍仁大學校 武道硏究所 1999 武道硏究所誌 Vol.10 No.1

The purpose of this study was to reform practically a Korean Judo's Doechigi-Bon(Forms of Counterattack, judo's Gaeshi no Kata, Judo's Uradori no Kata, Judo's Gonosen no Kata) that was established in 1955 Korea, according to changing of techniques by Judo's modernization, in order to have Judo's carefulness and systematic diffusion. Reform procedure of Judo's Doechigi-Bon was 1st stage, Questionnaire survey 303 judokas, 2nd stage, Technical seminar by judo experts(12 judo professor) 4 times, 3rd stage, wording report for reform, 4rd stage, Discussion and judgement of Teaching and Judgement commission of Korean judo Association(KJA), 5th stage, Public hearing for reform in KJA, 6th stage, Report and decision of board of directors in KJA, 7th stage, public publication of Judo News(No.53) in KJA. Basic principle of reform of Judo's Doechigi-Bon were as table 1. Table 1. Basic principle of reform of Judo's Doechigi-Bon ------------------------------------------------------------------------------- Items Reformed Key Points of Judo's Doechigi-Bon ------------------------------------------------------------------------------- 1. Structure 1) Grand classification : Classified by 3 parts(1,2,3Gyo) 2)Medium classification : Te waza, Goshi waza, Ashi waza devided per each part(Gyo) 3)Sub-classification : Classified five techniques per each part(Gyo) 2. Contents 1) Selected established techniques as possible 2) Considered rationalty and overlapping of counterattack techniques 3. Decision of Conterattack techniques 1) Refered to results of Basic Questionnaire survey 2) Priority to decisions of Judo expert technical seminar -------------------------------------------------------------------------------- Reformed Korean Judo's Doechigi-Bon(Forms of Counterattack techniques-KJA, 1999) are as follows: 1. Gyo; ① Uki otoshi -> Uchi mata ② Harai goshi -> Harai goshi gaeshi ③ O soto gari -> O soto gake ④ Ko uchi gari -> Sasae tsurikomi ashi ⑤ O uchi gari -> Ko soto gari 2. Gyo; ① Ippon seoi nage -> Okuri eri jime ② Tsuri domi goshi -> Uki waza ③ Okuri ashi harai -> Okuri ashi harai ④ Ko soto gari -> Tai otoshi ⑤ Hiza guruma -> Hiza guruma 3. Gyo; ① Kata guruma -> Sumi gaeshi ② Tai otoshi -> Ko soto gari ③ Hane goshi -> Harai tsurikomi ashi ④ Uchi mata -> Tai otoshi ⑤ Tomoe nage -> O uchi gari

Optimum Target Trajectory For The SAR Interferometry Repeat Observation Satellite

Park, Jae-Ik,Park, Sang-Young,Choi, Kyu-Hong 한국우주과학회 2006 한국우주과학회보 Vol.15 No.2

Multi-scale analysis of an ATLAS-MSLB test using the coupled CUPID/MARS code

Park, Ik Kyu,Cho, Seok,Kang, Doo Hyuk Elsevier 2018 Annals of nuclear energy Vol.113 No.-

<P><B>Abstract</B></P> <P>This study describes a multi-scale nuclear safety analysis method for a main steam line break accident, which focuses on the 3-dimensional approach for the coolant temperature in the reactor pressure vessel related to the re-criticality and/or pressurizer thermal shock. The direct coupled code, CUPID/MARS, where CUPID is a 3-dimensional two-phase flow analysis code and MARS is a 1-dimensional nuclear system analysis code, was validated against a main steam line break test in the ATLAS facilities, which are a 1/2 scale integral test loop for a Korean APR1400 PWR. The calculation indicates that the suggested 4-step method, which expands the previous 2-step method of steady-state and transient calculations of a 1-dimensional system code, is valid for analyzing a direct 1-D/3-D coupled safety analysis, and the 3-dimensional temperature distribution in the downcomer agrees with the measured result.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A multi-scale analysis methodology using CUPID and MARS codes is proposed. </LI> <LI> ATLAS-MSLB were successfully simulated by the proposed methodology. </LI> <LI> CUPID/MARS will be valid for analyzing a nuclear reactor system with 3-D components. </LI> </UL> </P>

Relative Orbit Control of Formation-Flying Mission in Low Earth Orbit Using Eccentricity/Inclination Vector Separation

Park, Jae-Ik,Park, Sang-Young,Choi, Kyu-Hong 한국우주과학회 2008 한국우주과학회보 Vol.17 No.1

Development of Sun-Glint Prediction Program For The Communication, Ocean and Meteorological Satellite

Park Jae-Ik,Choi Kyu-Hong,Park Sang-Young,Lee Byoung-Sun,Ahn Yu-Hwan 한국우주과학회 2004 한국우주과학회보 Vol.13 No.2