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임종훈,임군,이경식,송정환,조재걸,정선태,오윤경,Lim, Jong-Hoon,Lim, Gun,Lee, Kyung-Shik,Song, Jeong-Hwan,Cho, Jae-Geol,Jung, Sun-Tae,Oh, Yun-Kyung 한국광학회 2004 한국광학회지 Vol.15 No.6
평면도파로 (Planar Lightwave Circuits)를 수소처리한 후 격자를 제작하였다. 성장특성 분석 결과 격자는 거듭제곱식 (power law)에 따라서 성장되는 것을 알 수 있었다. 격자의 성장특성을 이용하여 외부 공진기 레이저용 평면도파로 격자를 설계하고 제작한 결과 예상치와 거의 일치하는 격자특성을 얻을 수 있었고, 제작된 격자로 구현된 외부 공진기 레이저에서 ∼40dB의 인접모드억압비(side mode suppression ratio)를 갖는 단일모드 발진을 관측할 수 있었다. Bragg gratings were fabricated in Ge-doped silica planar lightwave circuits (PLC) for different writing conditions to study the growth characteristics. The refractive index modulation of the gratings grew in the PLC with total fluence F according to the power law $\Delta$n=A $F^{B}$. The characteristics of the PLC gratings formed for external cavity lasers match closely to those predicted by the power law. The oscillation spectra of the FP-LD with a Bragg grating grown in the PLC waveguide were also presented.d.
A Study on the Expressive Characteristics of Public Facilities Considering Local Identity
임종훈 한국공간디자인학회 2023 한국공간디자인학회논문집 Vol.18 No.1
(Background and Purpose) Due to the acceleration of economic development and urbanization, many problems are occurring in local cities. It is expressed in various ways, such as population concentration and overcrowding, bipolarization between big cities and regions, damage to natural landscapes due to excessive development, and loss of unique local identity. At this point, local cities are required to find a local city image through differentiated local elements, and to find a way to establish a sustainable local identity. Therefore, this study aims to focus on the importance of local identity, to derive local identity elements and expressive characteristics, and to present the design direction of elements that can be used when applying local identity to public facilities. (Method) This study is to recognize the characteristics and design direction of public facilities considering local identity, and the scope and method of the study will be conducted as follows. In the theoretical review, it studies the concept and elements of local identity, and the characteristics of local identity based on literature review through previous studies, derives local identity elements through analysis of previous studies, based on which it aims to study the expressive characteristics of public facilities considering local identity through comparative analysis with evaluation items and elements of public facilities. (Results) Local identity elements derived through the analysis of previous studies related to regional revitalization can be categorized into five elements: historicity, culturality, landscape, industriality, and symbolism. The elements can be used in the same sense as elements used as evaluation items in the public design sector. Regional historical identity requires accessibility, landscape, sustainability, and symbolism in public design items, cultural identity requires accessibility, sustainability, symbolism, and social interaction, and landscape identity requires accessibility, safety, landscape, comfort, aesthetic, and symbolism to be expressed in public facilities. Industrial identity requires accessibility, usability, functionality, economic feasibility, constructability, and safety, and symbol identity requires accessibility, landscape, aesthetic, sustainability, and symbolism. Here, accessibility, publicity, and local identity are basically included in all elements. (Conclusions) Establishing a local identity is very important for regional revitalization in an urban environment. Local images can be expressed with unique local elements along with differentiation from other regions, through which it is possible to build regional urban competitiveness. Therefore, it should be planned to derive local identity elements and actively utilize them for local public facilities. If public facilities considering local identity are applied, it is expected to play a symbolic role by establishing a unique local image, and at the same time inspire pride in community members.
Modeling of the wet flue gas desulfurization system to utilize low-grade limestone
임종훈,최영렬,김건열,김정환 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.12
Wet flue gas desulfurization was simulated to improve gypsum production using low-grade limestone. High-grade limestone with 94 wt% CaCO3 content is used for producing gypsum with 93 wt% purity, but owing to the resource depletion of high-grade limestone, low-grade limestone should be replaced as an alternative. However, lowgrade limestone with CaCO3 purity of less than 94% contains impurities such as MgCO3, Al2O3, and SiO2, which reduce gypsum purity. To resolve this issue, a process involving mixing of both low-grade and high-grade limestone was simulated to predict the quantity of low-grade limestone that could be utilized. Many reactions like limestone dissolution, SOX absorption, and crystallization were considered and were simulated by different models in Aspen plus. For process optimization, the following constraints were set: 93 wt% gypsum purity, 94% desulfurization efficiency, and 3,710 kg/h total limestone usage, which maximized the mass flow of low-grade limestone. The maximum blending quantity of low-grade limestone for 2,100 kg high-grade limestone that satisfied the constraints was ~1,610 kg.
임종훈,이경식 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.8
We propose and design a new type of anrrow band-pass optical filter based on two fiber gratings with different reflection wavelength. The ripples occur in the spectra of the filter with two uniform fiber gratings. Our simulation results also show that the ripples disappear with the fiber gratings apodized to both gaussian and hyperbolic tangent function. The hyperbolic tangent function seems to be a better apodization function for improving the filter's performance in terms of narrow pass bandwidth and high transmission.