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닥나무의 사료가치에 관한 연구 제 2 보 . 닥나무 재배방법 및 엽의 급여가 육성 - 비육돈의 증체에 미치는 영향
정현승,이을희,정장용 ( Hyun Sung Chung,Ell Hee Lee,Jang Young Jung ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5
This experiment was carried out to determine the yield, chemical composition and feeding value of the leaves and rhytidome of Broussonetia kaxirtoici, Sieb. The feeding value of the leaves fed liberally to growing-finishing pigs was determined under the restricted feeding in which the daily allowance of formula feed was 3 % of body weight, compared with 4 % in the controls. Ten pigs of the same litter were alloted in equal numbers into the control and experimental groups and conducted the feeding trial for 2 months. The results obtained are summarized as follows : 1. The annual yield of green leaves of Broussonetia kazinoki, Sieb. grown on the College Experimental Farm was averaged about 2,000㎏/10a. 2. The chemical composition of the leaves was determined on the dry matter basis as follows ; crude protein : 11.4%, crude fat: 4.74%, crude fiber : 32.33%, crude ash : 13.43% and nitrogen free extracts : 37.16%. 3. The chemical composition of the rhytidome was determined on the dry matter basis as follows ; crude protein : 13.43%, crude fat : 5.94%, crude fiber : 33. 19%, crude ash ; 33.60% and nitrogen free extracts : 27.26 %. 4. The body weight gain for 2 months was averaged 33.8㎏ and 36. 2㎏ in the control and experimental pigs, respectively. However, there was no significant (P$lt;0.05) difference in body weight gain between two groups. 5. The feed conversion was improved slightly in the experimental group(3.2) as compared with the control (3.8). 6. The liberal feeding of the green leaves resulted in the decrease of about 60 won in the feed cost for 1 ㎏ body gain of the growing-finishing pigs. 7. The leaves were found palatable to the pigs and the pigs fed the leaves were found to be normal clinically.
돈사상부공간을 이용한 가토사육이 돈의 증체에 미치는 영향 제4보 . 가토분뇨 및 잔사의 자유채식이 사료의 급여수준을 달리했을 때 육성 - 비육돈의 증체에 미치는 영향
정현승,정장용 ( Hyun Sung Chung,Jang Young Jung ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5
This experiment was carried out to determine the effect of liberal feeding of rabbit feces and residual forage on the growth of growing-finishing pigs subject to restricted feeding in which the daily allowance of formula feed was 3 % of body weight, compared with 4 % in the controls. The rabbit feces and residual forage were to be dropped from the hutches above the pig barns. Eight pigs of the same litter gave the similar initial body weight of 40㎏ and were alloted in equal numbers to the control and experimental groups. The results from feeding trial for 2 months are summarized as follows 1. The body weight gain for 2 months was averaged 44.9 ㎏ and 43.0㎏ in the control and experimental pigs, respectively. However, there was no significant (P$gt;0.05) difference in the body gain between two groups. 2. The feed conversion was improved slightly in the experimental group (2.8) as compared with the control (3.4). 3. The palatability of rabbit feces and residual forage to pigs was decreased during the late finishing period. 4. The liberal feeding of rabbit feces and residual resulted in the decrease of about 60 won in the feed cost for 1 ㎏ body weight gain of pigs. 5. The pigs fed rabbit waste and residual forage were found to be normal clinically.
정현승(Jung Hyun Seung),김애화(Kim Ae Hwa) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.22
본 연구는 중학생을 대상으로 학년과 집단에 따른 기초 연산 유창성 발달 특성과 기초 연산 유창성이 수학 성취도에 미치는 영향을 살펴보았다. 본 연구를 위한 도구개발 및 자료 수집은 2019년 5월 한 달간 진행되었다. 기초 연산 유창성 측정을 위해 덧셈, 뺄셈, 곱셈, 나눗셈별로 두 세트(한 자리 수 연산, 한 자리 수와 두 자리 수 연산)씩 총 8세트의 검사를 제작하여 실시하였고, 수학 성취도 평가는 초등 수준의 연산 능력을 평가하는 초등 수학 성취도 검사와 중등 수준의 연산 능력을 평가하는 유 리수 성취도 검사를 실시하였다. 결과분석을 위하여 다변량 분산분석(MANOVA) 및 중다회귀분석을 실시하였다. 주요 연구 결과는 다음과 같다. 첫째, 학년 및 집단에 따른 기초 연산 유창성의 차이를 살펴보면, 한 자리 수와 두 자리 수의 곱셈 연산 을 제외한 모든 기초 연산 유형에서 학년별 주 효과가 나타났고, 모든 연산 유형에서 집단별 주 효과가 나타났다. 둘째, 수학 성취도에 대한 집단별 기초 연산 유창성의 예측력을 살펴보면, 학습부진의 경우 수학 성취도에 대한 기초 연산 유창성의 설명 력이 일반학생의 수학 성취도에 대한 설명력보다 더 높게 나타났다. 이 연구 결과에 대한 논의를 기술하였다. middle school students and to examine the effect of basic fact fluency on math achievement. For measuring basic fact fluency, eight sets of tests were administered: two sets for each operation of arithmetic(i.e., addition, addition, subtraction, multiplication, and division). For measuring mathematical achievement, two sets of mathematical achievement tests were administered: (a) general math achievement test for elementary school, and (b) mathematics operation test for secondary school. Multivariate ANOVA(MANOVA) and multiple regression analysis were performed for result analysis. Major results are summed up as follows. First, there was a main effect by grade in all subtests of basic fact fluency testexcept multiplication. Also, there was the main effect by group in all subtests of basic fact fluency test. Second, the basic fact fluency accounted for more variance in mathematic achievement for students with learning difficulties than those without learning difficulties. The results are discussed in regard to the results of this study are described.
NaBH4 가수분해 반응에 의한 무인항공기용 PEMFC 수소공급
정현승 ( Hyeon Seong Jung ),조병주 ( Byung Joo Jo ),이정훈 ( Jung Hoon Lee ),이한종 ( Han Jong Lee ),나일채 ( Il Chai Na ),추천호 ( Cheun Ho Chu ),박권필 ( Kwon Pil Park ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.1
Proton Exchange Membrane Fuel Cells (PEMFC) instead of batteries is appropriate for long time flight of unmanned aero vehicles (UAV). In this work, NaBH4 hydrolysis system supplying hydrogen to PEMFC was studied. In order to decrease weight of NaBH4 hydrolysis system, enhancement of hydrogen yield, recovery of condensing water and maintenance of stable hydrogen yield were studied. The hydrogen yield of 3.4% was increased by controlling of hydrogen pressure in hydrolysis reactor. Condensing water formed during air cooling of hydrogen was recovered into storage tank of NaBH4 solution. In this process the condensing water dissolved NaBH4 powder and then addition of NaBH4 solution decreased system weight of 14%. NaBH4 hydrolysis system was stably operated with hydrogen yield of 96% by 2.0g Co-P-B catalyst for 10 hours at 2.0L/min hydrogen evolution rate.
증거기반교수를 활용한 수감각 프로그램이 수학학습장애 위험군 아동의 수 분해와 합성 유창성 및 기본 연산 능력에 미치는 효과
정현승(Jung, Hyun Seung),김애화(Kim, Ae Hwa),윤나영(Yoon, Na Young) 단국대학교 특수교육연구소 2020 특수교육논총 Vol.36 No.1
연구목적: 본 연구에서는 증거기반교수를 활용한 수감각 프로그램이 수학학습장애 위험군 아동의 기본연산 능력에 미치는 효과를 살펴보았다. 연구방법: 7세 아동 4명이 참여하였으나, 국가재난상황 및 질병을 이유로 2명이 탈락되어 최종 2명을 대상으로 연구가 진행되었다. 연구는 대상자간 중다간헐기초선 설계(multiple intermittent baseline design)를 적용하여 실시하였다. 증거기반교수를 활용한 수감각 프로그램의 주요 교수 내용은 수의 합성과 분해 활동으로 이루어졌고, 교수 방법으로는 CSA와 직접교수 등을 활용하였다. 연구결과: 증거기반교수를 활용한 수감각 프로그램은 대상 아동 모두에게 수감각 유창성과 기본 연산 능력에 긍정적인 영향을 주었다. 결론: 본 연구 결과가 현장에 주는 시사점, 연구 결과의 제한 및 추후 연구에 관한 제언이 논의되었다. Purpose: The purpose of this study is to examine the effectiveness of number sense improvement program using of evidence-based instruction on number composition and decomposition fluency and basic facts of students at-risk for math learning disabilities. Method: In this study, a multiple intermittent baseline design was used to investigate the effects of number sense program with four students at-risk for math learning disabilities. The contents of the number sense program using evidence-based Instruction were composed of the number composition and decomposition activities, CSA(Concrete level-Semiconcrete level-Abstract level) and direct instruction were used as teaching methods. Result: The study found that the number sense program using evidence-based instruction had a positive effect on both the subject children"s ability to automate of number sense and basic facts. Conclusion:: Suggestions on the implications of this study"s findings on the site, restrictions on the results of the study, and future research were discussed.
정현승(Hyun-Seung Jung),권태수(Teasoo Kwon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this paper, topology optimization method is applied to the rolling stock end frame design. Four loading conditions such as center sill compression, cant rail compression, window sill compression and vertical load are considered. For each load and combined total loads, compliance or linear sum of compliance is minimized to find the stiffest end frame topology. Based on the topology design result, new underframe a structure (COMER shape) is proposed. The static strength and the dynamic crash behavior of the new underframe design are compared with those of the conventional design.