24 research outputs found
μλ μ μμμΉκ³Ό μ§λ£ μ λΆλͺ¨μ λΆμμ κ΄ν μ°κ΅¬
νμλ
Όλ¬Έ(μμ¬) --μμΈλνκ΅ μΉμνλνμ :μΉμνκ³Ό,2010.2.Maste
A study for the image quality enhancement methods of a dental digital panoramic imaging system
μ곡νκ³Ό/μμ¬[νκΈ]λ³Έ μ°κ΅¬μμλ κΈ°μ‘΄ μΉκ³Όμ© λμ§νΈ νλ
ΈλΌλ§ μμμ₯μΉμ μμνλ μ μλ°λλ κΈ°μ μ λ¬Έμ μ λ€μ λΆμνκ³ , μ΄λ₯Ό ν΄κ²°νκΈ° μν΄ νλ
ΈλΌλ§ μμνμ± μ리μ μ
κ°νμ¬ νμ§κ°μ λ°©μμ μ°κ΅¬νμλ€. νλ
ΈλΌλ§ μμνμ±μ νλλ, μ μκ³Ό μμμΌμ κ°μ μλμλ, image layer λ±κ³Ό κ°μ νμ§μΈμμ μν΄ κ²°μ λλ©°, μ΄λ¬ν μμνμ±μ μ λ°μ리λ₯Ό ν λλ‘ μΉκ³Όμ© λμ§νΈ νλ
ΈλΌλ§ μμμ₯μΉλ₯Ό ν¬κ² X-μ λ°μλΆ, μμμΌμλΆ, μ΄λμ μ΄λΆλ‘ ꡬλΆνμ¬ κ΅¬μ±νμλ€. ꡬμ±λ μμμΌμλΆμ ν΄μλ νΉμ±μ λνλ΄λ λ³μ‘°μ λ¬ν¨μ(modulation transfer function; MTF)λ 10% MTF κ°μμ μ½ 3.9 LP/mm μ λλ‘ μΈ‘μ λμμΌλ©°, μ΄λμ μ΄λΆλ κΈ°μ‘΄μ λ±μνμ λͺ¨λμμ λ³μνμ λͺ¨λλ‘ λ³κ²½νμ¬ μ μΉλΆμ κ²½μΆν¨κ³Ό(cervical vertebral effect)λ₯Ό μ΅μνν μ μλλ‘ κ°μ νμλ€. νκ΅νμ€μΈμ κΈ°μ€μ
κΆμ λͺ¨λΈλ§νκΈ° μν΄ Digital Koreanκ³Ό VCT μμ λ°μ΄ν°λ₯Ό ν λλ‘ μ±μΈ λ° μμμ λνμ
κΆμ μΆμΆνμμΌλ©°, λν νλ
ΈλΌλ§ μμνμ§ νκ° μ€νμ μν΄μ λ€μν ννμ ν
μ€νΈ ν¬ν
μ μ μνμλ€. λν νλ
ΈλΌλ§ μμμ μ€μν νμ§μΈμ μ€μ νλμΈ image layer λκ»λ₯Ό μΈ‘μ ν μ μλ ν
μ€νΈ ν¬ν
μ μ€κ³ λ° μ μνμμΌλ©°, λ³Έ μ°κ΅¬μμ μ€κ³λ ꡬλ μνμ€μ λν image layerμ λκ»λ μ μΉλΆ λ° κ΅¬μΉλΆμμ κ°κ° μ½ 12 mm, 24 mmλ‘ μΈ‘μ λμλ€. λν λ³Έ μ°κ΅¬μμ μ€κ³λ ꡬλ μνμ€μ μμ μ μ©μ±μ νκ°νκΈ° μν΄ skull ν¬ν
μ μ¬μ©νμ¬ νλ
ΈλΌλ§ μμμ νλν ν κ·Έ νμ§μ νκ°νκ³ μ£Όμ λ¬Έμ μ μΈ κ²½μΆν¨κ³Όμ μμν¨κ³Ό(ghost effect)λ₯Ό μ΅μνν μ μλ λ°©μμ μ μνμλ€.
[μλ¬Έ]In this study, we first analyzed technical problems in achieving panoramic images from a present dental digital panoramic imaging system, and studied possible methods for the improvement of its image qualities. The formation of panoramic images is determined by the image quality factors such as magnification, the relative speed between the source and imaging sensor, and image layer, and a prototype system, mainly consisted of X-ray generator part, imaging sensor part, and motion controlling part, was developed to test several technical approaches we proposed in this study. Modulation transfer function (MTF), a general indicator for the resolution property of imaging systems, was measured for the prototype as about 3.9 LP/mm at a 10% MTF value. We proposed a new motion control sequence of variable rotational speed, instead of constant rotational speed, in order to minimize the cervical vertebral effect at the front dental arch which may be one of the most serious problems in present dental panoramic imaging systems. We also performed the modelling of Korean reference dental arches for adult and infant based upon the Digital Korean and VCT clinical data, and fabricated various test phantoms to evaluate image quality. The thicknesses of the image layer, which is one of the important image quality factors in panoramic radiography, were measured about 12 and 24 mm for the front and side dental arch for the designed motion sequence, respectively. In addition, we tested the panoramic image qualities using a skull phantom in order to evaluate the clinical applications of the motion sequences designed in this study, and proposed some possible solutions against the cervical vertebral and ghost effects.ope
λ¬Όλ₯창곡μ μ νκ²½κ²½μμμ€ν (ISO14001)κ΅¬μΆ λ° μΈμ¦μΆμ§μ κ΄ν μ°κ΅¬ -Dμ¬ μ¬λ‘λ₯Ό μ€μ¬μΌλ‘-
Abstract
A study for establish and certify ISO14001 for Logistics Warehousing Industry
- Focused onβDβ company case -
Choi, Sung Il
Department of Shipping & Port Logistics
Graduate School of Marine Finance and Logistics
Korea Maritime And Ocean University
(Directed by Professor Gwon, Mun Gyu)
Logistic business has been changed a lot in the globalized competitive environment of the 21st century. It is being established and developed to eco-friendly logistic system, to minimise hazardous for environment and save energy for limited resources. Recently, despite the fact that βEco-Friendly Logisticβ is emerging as an important issue in logistic business due to environmental regulations, it is realized that there are no certain investigation and countermeasure in domestic market. These conflicting and changing between economic and environmental requirement, A harmonious system has become demanded and the ISO 14001(Environmental Management System) standard proposed by the international Organisation for Standardization (ISO) has become a mandatory
requirement due to many changes in international/domestic market.
In this research, identify the concepts and characteristics of environmental management and environmental management system and certification system. As a result of social interest and strengthened regulations, there is a tendency to introduce environmental management systems not only in the manufacturing industry but also in the service sector and public services, however, the warehousing business in the establishment and certification process of the environmental management system of the warehousing business. The purpose of this research is to investigate the process of establishing and certifying the environmental management system through the case of βDβ company, and to propose more efficient introduction method and improvement plan of performance.
Abstract β
°
μ 1μ₯ μ λ‘ 1
1.1 μ°κ΅¬μ λ°°κ²½ λ° λͺ©μ 1
1.2 μ°κ΅¬μ λ°©λ² λ° λ²μ 3
μ 2μ₯ μ΄λ‘ μ λ°°κ²½ 4
2.1 νκ²½ κ²½μκ³Ό νκ²½κ²½μμμ€ν
μ κ°λ
λ° νΉμ± 4
2.1.1 νκ²½ κ²½μμ κ°λ
λ° νΉμ± 4
2.1.2 νκ²½κ²½μμμ€ν
μ κ°λ
λ° νΉμ± 7
2.2 νκ²½ κ²½μμμ€ν
μ νμ€ μ μ 9
2.2.1 κ΅μ νμ€ν기ꡬ(ISO) 9
2.2.2 κ΅μ νμ€ν μ μ μ μ°¨ 11
2.3 νκ²½κ²½μμμ€ν
(ISO14001) μΈμ¦μ λ μ°κ΅¬ 13
2.3.1 νκ²½κ²½μμμ€ν
νμ€μ κ΅¬μ± 13
2.3.2 νκ²½κ²½μμμ€ν
μΈμ¦μ λ 15
2.3.3 νκ²½κ²½μμμ€ν
μΈμ¦μ μ°¨ 16
2.3.4 νκ²½κ²½μμμ€ν
μΈμ¦νν© 19
μ 3μ₯ Dμ¬μ ISO14001 νκ²½κ²½μμμ€ν
κ΅¬μΆ λ° μΈμ¦ μ¬λ‘ 24
3.1 Dμ¬μ νμ¬κ°μ λ° λμ
λ°°κ²½ 24
3.1.1 νμ¬κ°μ 24
3.1.2 νκ²½μμ€ν
λμ
λ°°κ²½ 24
3.2 νκ²½κ²½μμμ€ν
ꡬμΆμ μ°¨ 25
3.2.1 μ΄κΈ° νκ²½μ± κ²ν λ° νκ²½λ°©μΉ¨ μ립 25
3.2.2 νκ²½μΈ‘λ©΄, λ²κ· λ° κ·Έλ°μ μꡬμ¬ν νμ
25
3.2.3 λͺ©νμ립 λ° μΆμ§κ³ν 30
3.2.4 νλ ¨ μΈμ λ° μ격과 μμ¬μν΅ 31
3.2.5 λ¬Έμν λ° κ΄λ¦¬ 32
3.2.6 νκ²½κ²½μ체μ μ΄μκ³Ό μ μ© 33
3.2.7 λͺ¨λν°λ§ λ° μΈ‘μ , μ€μνκ°, λΆμ ν© μμ λ° μλ°©μ‘°μΉ 35
3.2.8 EMS κ°μ¬ (λ΄λΆ μ¬μ¬) λ° κ²½μ κ²ν 37
3.3 Dμ¬μ νκ²½κ²½μμμ€ν
μΈμ¦μ μ°¨ 39
μ 4 μ₯ νκ²½κ²½μμμ€ν
λμ
μ±κ³Ό λ° κ°μ μ¬ν 42
4.1 Dμ¬μ νκ²½κ²½μμμ€ν
λμ
μ±κ³Ό 42
4.1.1 μ μ±μ μ±κ³Ό 42
4.1.2 μ λμ μ±κ³Ό 43
4.2 Dμ¬μ νκ²½κ²½μμμ€ν
κ°μ μ¬ν 45
μ 5 μ₯ κ²° λ‘ 47
5.1 μ°κ΅¬μμ½ λ° μμ¬μ 47
5.2 μ°κ΅¬μ νκ³ λ° ν₯ν μ°κ΅¬λ°©ν₯ 48
μ°Έκ³ λ¬Έν 50Maste