52 research outputs found
μ₯λ³ μμ΄ μλ°© νλ‘κ·Έλ¨μ κ΄ν μΌ μ°κ΅¬ : κ΅°μ’ λͺ©μ¬μ μν νλμ μ€μ¬μΌλ‘
KOICAμ μ΄μ²μ°μμ¬μ μ μ€μ¬μΌλ‘
νμλ
Όλ¬Έ(μμ¬) -- μμΈλνκ΅λνμ : νμ λνμ 곡기μ
μ μ±
νκ³Ό, 2022. 8. μ΄μμ.In consideration of the growing importance of the profitability of public enterprises, this study empirically examines the influence factors for public corporationsβ global expansion, which is one of the methods for their business diversification. And it aims to compensate for the limitations in the previous studies that lack empirical evidence by confirming the positive effects of ODA projects on the overseas expansion of public companies and to support the effectiveness of public companiesβ ODA projects. To do so, this study empirically explores the influence of Invitational Training Projects the first step for most of the KOICA-led ODA projects
carried out by public enterprises in finding their business opportunities and winning contracts in the overseas market.
In this study, Zero-Inflated Negative Binomial regression model (ZINB) was used to test the factors how the ODA Invitational Training Projects give impacts to public companies when discovering and acquiring overseas business contracts. And to overcome the limitations of the quantitative research due to the limited data, case study on the influence factors of related public companies and KOICA was also conducted.
The results are summarized as follows: (1) Public corporationsβ ODA Invitational Training Projects have a positive(+) effect on discovering opportunities and expanding their business in the recipient country. In particular, it was confirmed as a significant influence factor for quasi-market-type public enterprises who promote business expansion in developing countries based on the network built through the Invitational Training Projects. (2) As for market-type public enterprises, the ODA Invitational Training Projects considerably affect on new business opportunities, such as feasibility study or consultancy project. (3) KOICA-led ODA Invitational Training Projects support public enterprises in establishing cooperative relationships with developing countries through field investigations, domestic trainings, on-site trainings and follow-up programmes. (4) When the target country belongs to the developing world or needs infrastructure improvement, ODA projects have a significant effect on exploring opportunities and winning contracts even for the public companies without any experience in carrying out invitational training projects. In summary, the results indicate that ODA projects including the KOICA-led Invitational Training Projects impact on future business opportunities for public corporations. The results of this study are meaningful in that they fill the gaps in the previous studies and prove the effectiveness of ODA projects as a strategy for overseas business.λ³Έ μ°κ΅¬λ 곡기μ
μ μμ΅μ±μ΄ μ μ μ€μν΄μ§λ νμμ μμ 곡기μ
μ μ¬μ
μμ λ€κ°ν λ°©λ² μ€ νλμΈ ν΄μΈμμ₯ μ§μΆμ λ―ΈμΉλ μν₯μμΈμ μ€μ¦μ μΌλ‘ νμ
νκ³ μ νμλ€. μ΄λ ODAκ° κ³΅κΈ°μ
μ ν΄μΈμμ₯ μ§μΆμ λ―ΈμΉλ κΈμ μ μν₯μ μ€μ¦μ μΌλ‘ νμΈνμ§ λͺ»ν μ νμ°κ΅¬μ νκ³λ₯Ό 보μνκ³ , 곡기μ
μ ODA μ¬μ
μνμ λν μ ν¨μ±μ μ§μ§νλλ° λͺ©μ μ΄ μλ€. μ΄λ₯Ό μν΄ κ΅λ΄ λνμ ODA κΈ°κ΄μΈ KOICA μ΄μ²μ°μμ¬μ
μ΄ ν΄μΈμ¬μ
λ°κ΅΄ λ° μμ£Όμ λ―ΈμΉλ μν₯ μμΈμ μ€μ¦μ μΌλ‘ νμν¨μΌλ‘μ¨ κΈ°μ‘΄ μ°κ΅¬μμ μ°¨λ³μ±μ λλͺ¨νκ³ μ νμλ€. ODA μ΄μ²μ°μ μ¬μ
μ΄ κ³΅κΈ°μ
μ ν΄μΈμ¬μ
μμ£Ό λ° λ°κ΅΄μ λ―ΈμΉλ μν₯μμΈμ κ²μ νκΈ° μν΄ κ³Όλ μ μμ μ΄ν νκ·λͺ¨νμ μ΄μ©νμμΌλ©°, μ νλ λ°μ΄ν°λ‘ μΈν μμ μ°κ΅¬μ νκ³λ₯Ό 극볡νκΈ° μν΄ κ΄λ ¨ 곡기μ
λ° KOICAμ μν₯μμΈμ λν μ¬λ‘μ°κ΅¬λ₯Ό μ§ννμλ€.
μ£Όμ μ°κ΅¬κ²°κ³Όλ λ€μκ³Ό κ°μ΄ 4κ°μ§λ‘ μμ½λλ€. 첫째, 곡기μ
μ ODA μ΄μ²μ°μμ¬μ
μνμ΄ μμκ΅μ λμμΌλ‘ ν ν΄μΈμ¬μ
μμ£Ό λ° λ°κ΅΄ νλμ μ (+)μ μν₯μ λ―ΈμΉλ κ²μΌλ‘ λνλ¬λ€. νΉν μ¬μ
λμκ΅μ΄ μ£Όλ‘ κ°λκ΅μ΄κ³ μ΄μ² μ°μμ¬μ
μ ν΅ν΄ ꡬμΆν λ€νΈμν¬λ₯Ό ν΅ν΄ μ¬μ
νμ₯μ μΆμ§νλ μ€μμ₯ν 곡기μ
μκ² μ μν μν₯μμΈμΌλ‘ νμΈλμλ€. λμ§Έ, μμ₯ν 곡기μ
μ κ²½μ°μλ μ κ· μ¬μ
μ κ²½μ°μλ ODA μ΄μ²μ°μλ₯Ό ν΅ν΄ νμ±λ λ€νΈμν¬κ° 컨μ€ν
μ¬μ
λ±μ νμ μ¬μ
μμ£Ό λ° λ°κ΅΄μ μ μν μν₯μ λ―ΈμΉλ κ²μΌλ‘ λνλ¬λ€. μ
μ§Έ, KOICA μ΄μ²μ°μκ° κ°λκ΅μ λμμΌλ‘ μ¬μ
μ λ°κ΅΄νλ 곡기μ
μκ² νμ§μ‘°μ¬, κ΅λ΄μ°μ, νμ§μ°μ, μ¬νκ΄λ¦¬ νλ‘κ·Έλ¨ λ±μ ν΅ν΄ νλ ₯κ΄κ³ ꡬμΆμ μ μν μν₯μ λ―ΈμΉλ κ²μ νμΈν μ μμλ€. λ·μ§Έ, ODA μ΄μ²μ°μ μ¬μ
μΆμ§ μ€μ μ΄ μλ 곡기μ
λ λΆν₯μ±
μ΄ νμν μ¬μ
μ΄κ±°λ μ¬μ
λμκ΅μ΄ κ°λκ΅μΈ κ²½μ°μ ODA μ¬μ
μ΄ μ¬μ
μμ£Ό λ° λ°κ΅΄μ μ μν μν₯μ λ―ΈμΉλ κ²μΌλ‘ κ΄μ°°λμλ€. μ΄λ¬ν μ°κ΅¬κ²°κ³Όλ₯Ό μ’
ν©ν΄ λ³Ό λ, KOICA μ΄μ²μ°μλ₯Ό λΉλ‘―ν ODA μ¬μ
μ΄ κ³΅κΈ°μ
μ ν΄μΈμ¬μ
μμ£Ό λ° λ°κ΅΄μ μ ν¨νκ² μμ©νκ³ μλ κ²μΌλ‘ νλ¨νμλ€. λ³Έ μ°κ΅¬μ κ²°κ³Όλ κ΅λ΄ μ νμ°κ΅¬μ 곡백μ 보μνκ³ , ν΄μΈμ¬μ
μΆμ§ μ λ΅μ νλλ‘μ¨ ODA μ¬μ
μ μ ν¨μ±μ μ§μ§νμλ€λ μ μμ μμκ° μλ€.μ μ 1 μ₯ μ λ‘ 1
μ 1 μ μ°κ΅¬μ λ°°κ²½ λ° λͺ©μ 1
μ 2 μ μ°κ΅¬μ λμ λ° λ°©λ² 3
μ 2 μ₯ μ΄λ‘ μ λ
Όμμ μ νμ°κ΅¬ κ²ν 5
μ 1 μ μ΄λ‘ μ λ
Όμ 5
1. 곡μ κ°λ°μμ‘°(ODA) 5
2. μ‘°κ±΄λΆ μμ‘° 6
3. ODA μ€μ νλ ₯κ΅ 10
4. KOICA κΈλ‘λ² μ°μμ¬μ
12
5. 곡기μ
μ μ¬μ
μμ λ€κ°ν 16
μ 2 μ μ νμ°κ΅¬ κ²ν 21
μ 3 μ μ νμ°κ΅¬μ λΉνμ κ²ν 27
μ 3 μ₯ μ°κ΅¬μ μ€κ³ 28
μ 1 μ μ°κ΅¬ λͺ¨ν 28
μ 2 μ μ°κ΅¬ κ°μ€ 29
μ 3 μ λ³μμ μ‘°μμ μ μ λ° μΈ‘μ 29
1. μ’
μλ³μ 29
2. λ
립λ³μ 30
3. ν΅μ λ³μ 31
μ 4 μ μλ£μμ§ λ° λΆμ 32
1. μλ£μμ§ 32
2. λΆμλ°©λ² 33
μ 4 μ₯ νκ·λΆμ κ²°κ³Ό 37
μ 1 μ λ³μμ κΈ°μ΄ν΅κ³λ 37
μ 2 μ μ΅μ λΆμ λͺ¨λΈ μ μ λ° λΆμ 45
μ 3 μ λΆμκ²°κ³Ό ν΄μ 48
μ 5 μ₯ μ¬λ‘ μ°κ΅¬ 50
μ 1 μ λͺ©μ 50
μ 2 μ μμ₯ν 곡기μ
μ ODA μ΄μ²μ°μ μν₯ λΆμ 50
1. ν곡 λΆμΌ μμ₯ν 곡기μ
52
2. μλμ§ λΆμΌ μμ₯ν 곡기μ
56
3. νλ§ λΆμΌ λ° κΈ°ν μμ₯ν 곡기μ
63
μ 3 μ μ€μμ₯ν 곡기μ
μ ODA μ΄μ²μ°μ μν₯ λΆμ 67
1. μ¬λ‘ 1 : νκ΅μ² λκ³΅μ¬ 68
2. μ¬λ‘ 2 : νκ΅λλ‘κ³΅μ¬ 73
3. μ¬λ‘ 3 : νκ΅ν μ§μ£Όνκ³΅μ¬ 75
4. μ¬λ‘ 4 : νκ΅μμμκ³΅μ¬ 78
5. μ¬λ‘ 5 : κΈ°ν μ€μμ₯ν 곡기μ
81
μ 4 μ KOICAγμ΄μ²μ°μ μ체 μν₯μμΈ λΆμ 86
1. KOICA μ΄μ²μ°μ μ°μ°¨λ³ κ³Όμ μ΄ μ£Όλ μν₯ λΆμ 87
2. KOICA μ΄μ²μ°μ νλ‘κ·Έλ¨μ΄ μ£Όλ μν₯ λΆμ 89
3. KOICA μ΄μ²μ°μ μ°μμ λ§μ‘±λ λ° μνκΈ°κ΄ νκ° 90
4. KOICA μ΄μ²μ°μ μ°μμ¬λ‘ 97
μ 6 μ₯ κ²°λ‘ 100
μ 1 μ κ²°λ‘ λ° μμ¬μ 99
μ 2 μ μ°κ΅¬μ νκ³ λ° ν₯ν μ°κ΅¬κ³Όμ 102μ
λΉμ ννκ·λͺ¨λΈμ μ΄μ©ν λ맀μ λκ°λ³ν (VRF) λ©ν°ννΈννμμ€ν μμμ κ³ μ₯ κ°μ§ λ° μ§λ¨ (FDD) λ°©λ²μ λν μ€νμ μ°κ΅¬
νμλ
Όλ¬Έ (μμ¬)-- μμΈλνκ΅ λνμ : κΈ°κ³ν곡곡νλΆ, 2011.2. κΉλ―Όμ.Maste
Studies on the Oil Retention and Performance of Oil Separator in Multi Heat Pump System
νμλ
Όλ¬Έ (λ°μ¬)-- μμΈλνκ΅ λνμ : κΈ°κ³ν곡곡νλΆ, 2015. 2. κΉλ―Όμ.This paper presents analytical and experimental studies on the oil retention and performance of oil separator in multi heat pump system.
To suggest the proper charge amount of oil in a compressor of heat pump system, the prediction of oil retention amount in each component of heat pump system is necessary. This study proposed analytical models for predicting the oil retention amount in gas, liquid and two phase regions of refrigerant. Based on the proposed models, oil retention amount in each component of multi heat pump system was predicted. From the simulation results, it was confirmed that the oil retention amount decreases 26.1% and 67.3% as the mass flux of refrigerant rises from 100 kgm-2s-1 to 250 kgm-2s-1 and oil circulation ratio diminishes from 0.9% to 0.1%, respectively. Among 6 components which include condenser, horizontal and vertical liquid lines of refrigerant, evaporators, horizontal and vertical gas lines of refrigerant, large amount of oil is retained in the gas lines of refrigerant.
Because most of discharged oil is in the gas lines of refrigerant, prediction of oil retention amount in gas lines of refrigerant is important. To verify the model for predicting the oil retention amount in gas lines of refrigerant, experiment was conducted to measure the oil retention amount in horizontal and vertical gas lines of refrigerant. The oil retention amount and pressure drop were measured with respect to the mass flux of refrigerant, oil circulation ratio and pipe diameter. Flow visualization was also conducted for horizontal line. The oil retention amount tends to decrease as mass flux becomes higher or oil circulation ratio diminishes. As pipe diameter increases, the oil retention amount goes up. Generally, the oil retention amount in vertical line was higher than that in horizontal line due to the effect of gravity force. As mass flux of refrigerant rises, however, the effect of gravity force becomes negligible, so the oil retention amounts in horizontal and vertical lines were similar. Based on the experimental results, the model of oil retention amount in gas lines of refrigerant was verified. The mean absolute percentage error of predicted and experimental results was 15.0%.
From the analytical and experimental studies on the oil retention in each components of heat pump system, it was confirmed that the oil circulation ratio highly affects the oil retention amount and pressure drop. Reduction of oil circulation ratio is required to enhance the system performance and reduce the initial charge amount of oil in compressor. In order to reduce the oil circulation ratio, high performance oil separator is necessary. This study measured the separation efficiency of oil separator and pressure drop at the oil separator. Separation efficiency and pressure drop were measured with respect to body diameter, body height and inlet configuration. Based on the experimental results, empirical models for predicting the separation efficiency and pressure drop were suggested. Different empirical models were proposed based on the inlet configuration. In case of inlet configuration of type 1, the mean absolute percentage errors of the models for efficiency and pressure drop were 0.4% and 7.8%. In case of type 2, those were 0.3% and 7.6%.Abstract i
Contents iv
List of Figures vii
List of Tables xiii
Nomenclature xiv
Chapter 1. Introduction 1
1.1 Background of the study 1
1.2 Literature survey 9
1.3 Objectives and scopes 18
Chapter 2. Numerical study on the oil retention in a heat pump system 21
2.1 Introduction 21
2.2 Simulation methodology 22
2.2.1 Modeling of oil retention in gas and liquid phase regions 22
2.2.2 Modeling of oil retention in two phase region 28
2.2.3 Overall heat pump system simulation 32
2.3 Results and discussion 40
2.4 Conclusion 54
Chapter 3. Experimental study on the oil retention and pressure drop 56
3.1 Introduction 56
3.2 Experimental methodology 57
3.2.1 Experimental apparatus 57
3.2.2 Experimental procedure 78
3.2.3 Data reduction 82
3.2.4 Uncertainty of measurements 93
3.3 Results and discussion 94
3.4 Verification of numerical study 111
3.5 Conclusion 114
Chapter 4. Study on the flow characteristics in oil separator 115
4.1 Introduction 115
4.2 Experimental methodology 116
4.2.1 Experimental apparatus 116
4.2.2 Experimental procedure 124
4.2.3 Data reduction 125
4.2.4 Uncertainty of measurements 128
4.3 Results and discussion 130
4.4 Modeling of the flow characteristics in oil separator 156
4.5 Conclusion 167
Chapter 5. Concluding remarks 169
References 172
Abstract (in Korean) 181Docto
A Study on the Conflicting Aspects of Gyeongju yulim[Confucian scholars] from the perspective of Gyelimsahwa
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