This study was performed to assess particulate matter removal efficiency of domestic air cleaner products in a field condition. The assessment also included air cleaners with different air removal mechanisms. The particulate matter (PM2.5) removal test with a different air removal mechanism using air cleaners showed that the electrostatic precipitation technique showed better performance compared with HEPA filters and other types of systems. Its removal efficiency was almost 95% in one of our operation times in the given test condition. It was assumed that not only the type of removal system but also the individual design, supply and exhaust system, and the automatically controlled air volume are involved in the removal efficiency. With respect to the area of application, tests with air cleaners for 40 m2, 60 m2, and 80 m2 areas revealed that particulate matter removal efficiency increased with the air cleaner that had a broad area of application. However, particulate matter removal efficiency by air cleaners did not correspondingly increase with the increase of the area of application. Moreover, the installation location did not influence particulate matter removal efficiency. Our results are expected to be used as the basic information for indoor air quality improvement and prediction using air cleaners.

In this study, we measured the concentration of total volatile organic compounds (TVOCs) in four different seasons from 2016 to 2017 in order to determine seasonal variation of indoor air quality in relation to public transportation modes (subways, trains, and express buses). The measurement was carried out both during rush hour when traffic was congested as well as during non-rush hour when traffic was not congested. Effects by season, degree of congestion, and characteristics of public transportation were analyzed on the basis of 295 items of data during the periods of congestion and 295 items of data during the periods of non-congestion. The average TVOCs concentration in winter was the highest with 226.4 μg/m 3 . The average TVOCs concentration on an express bus was the highest with a seasonal average of 142.3 μg/m 3 . The TVOCs concentration in the period of congested traffic was higher than in the period of non-congested traffic for all public transportation modes. For the average TVOCs concentration by season and transportation, there was no data that exceeded the guidelines regarding maintaining indoor air quality. However, 2.5% of all sample measured data (TVOCs) exceeded the guidelines regarding maintaining indoor air quality. Therefore, the continuous monitoring of public transport vehicles is required.

A number of studies on airborne pollutants and microorganisms using ultraviolet sterilization have been conducted. Countermeasures are also needed to be taken against contamination and damage that occur on indoor surfaces in addition to indoor air. In this study, a method to predict UV-C intensity distribution using radiance calculation was introduced for the purpose of surface sterilization using UVGI systems and compared with the measured UVC intensities in a kitchen model room. The results of calculations showed a similar distribution of ultraviolet intensity with the measured intensities, although there was some discrepancy, probably due to different reflectance of building materials. And some bacteria and viruses occasionally identified in kitchens were predicted to be sterilized 99.9% only after about 30 minutes of UV-C irradiation with the figure 90% for fungi. The sterilization performance of UVGI and exposure time to UV-C were reasonably predicted using the radiance calculation method, and UV sterilization can be achieved with great effect even after a short period of time.

형사소송법 제56조는 공판기일의 소송절차에 관한 것으로 공판조서에 기재된 것은 그 공판조서만으로 증명한다고 규율하고 있다. 이는 증거가 치 판단에 대해 자유심증주의를 채택하고 있는 형사소송법의 중대한 예외이다. 위와 같은 공판조서의 배타적 증명력 규정은 상소심에서의 소송 경제를 위한 입법적 결단이라 할 것이다. 공판조서의 배타적 증명력은 공판기일에서의 소송절차에 관한 사항에만 인정된다. 사건의 실체적 내용에 관해서는 배타적 증명력이 인정되지 아니한다. 그 밖에 공판조서가 존재하지 아니하는 경우, 멸실된 경우, 권한 없는 자에 의하여 작성된 경우, 소송관계인들의 이의제기가 있는 경우나 피고인의 공판조서열람권이 침해된 경우, 그리고 공판조서가 위조·변조·허위기재된 경우 등에도 배타적 증명력이 부정된다. 한편 대법원은 공판조서에 명백한 오기가 있는 경우 그 공판조서는 올바른 내용대로 증명력을 가진다고 판시함으로써 제56조의 해석론에 관한 큰 전기를 마련하였다. 위 판례는 공판조서의 배타적 증명력을 다투려는 시도를 계속 부인해 온 그간의 입장으로부터 진일보한 것으로 평가할 수 있다. 공판조서의 근본적인 한계는, 그것에 실제 형사절차에서 있었던 모든 사건을 있는 그대로 기재할 수 없다는 점이다. 따라서 공판조서의 정확성과 신뢰성을 높이려면 공판정에서의 속기·녹음·영상녹화를 보다 활성화할 필요가 있으며, 필요한 경우에는 속기·녹음·영상녹화로 공판조서를 보완·수정하는 것도 가능하도록 해야 한다. 그리고 국민참여재판의 배심원들은 공판조서의 배타적 증명력에 구애받지 않고 평의·평결· 토의할 수 있도록 하는 것이 타당하다.

Charcoal canisters are broadly used for radon detection because of their handiness and short sampling period. Radon detection using charcoal canisters are known to be susceptible to surrounding conditions such as temperature and humidity. Public radon inspectors cannot handle extreme temperature, and the relative humidity can differ in districts due to the use of different types of construction. Thus, if relative humidity can be controlled at the entrance of a charcoal canister, radon inspectors will be able to procure more reliable data. The purpose of this study was to assess the efficiency of existing filters in a charcoal canister and to apply a new type of filter (Super Absorbent Polymers, SAP) that can control the moisture penetrating into the charcoal canister. Based on adequate case studies using the new filter, radon data have shown over 98% close to the reference data irrespective of varying moisture levels. Meanwhile, basic filters showed 88% similarity compared to the reference data, which means that charcoal canisters were affected by moisture. The SAP filter is reasonably inexpensive and once it turns into its gel shape (which, in turn, is saturated by moisture), it can be easily replaced. This filter will not only be able to provide more accurate radon data, but also apply to other gas phase material detections that are sensitive to moisture in the air.

This study was conducted to determine the absorption properties of silicone oil, liquid paraffin, and silicone rubber as absorbents for hydrophobic volatile organic compounds (VOCs) mainly emitted from the printing and publishing industry through VOCs absorption efficiency and partition coefficient. Also, changes in absorbability were tested through blending of absorbents and load of target VOCs mixtures. The results obtained can be used as fundamental data to choose an appropriate absorbent. All of the three absorbents showed an excellent absorption efficiency of above 98% for each 5 wt% load of the target VOCs including toluene, xylene, methyl ethyl ketone (MEK), isopropyl alcohol (IPA), 1,2,4-trimethylbenzene (124-TMB), and n-Nonane. In terms of toluene load, all absorbents showed good absorption efficiency of above 95% to a high load of 15 wt%. The air-absorbent partition coefficient of each target compound (P value) exhibited the highest value of 9.8 × 10−5 for 124-TMB in silicone rubber and the lowest value of 1.6 × 10−2 for IPA in liquid paraffin. These results indicate that the target VOCs had high affinity for the three absorbents. Absorption efficiency for the target VOCs at various absorbent blending ratios using three kinds of absorbents was improved to 99.9% regardless of the absorbent type or blending ratio. This result suggests that the shortcomings of single absorbents can be overcome through absorbent blending, enabling cost reduction and applicability to a dry-type treatment process. In treatment for mixture of the target VOCs to mimic an actual VOCs treatment, the absorption performances of silicone oil showed an absorption efficiency of 99% for 16 wt% of total VOCs load. These results indicated that silicone oil could be considered as a good absorbent.

산업보안에 대한 중요성이 강조되면서 산업기술 유출과 관련된 행위를 규율하는 법률들의 모습도 더욱 다양화 되고 체계화되고 있다. 그러나 우리는 기존의 범죄행위는 물론이고 산업기술유출 관련 범죄로 인해 처벌받은 사건들을 놓고 일반시민은 물론이거니와 법조인들의 의견과 해석이 갈리는 현상을 종종 목격해왔다. 본 연구는 상대적으로 새롭게 조명 되고 있는 산업기술유출 관련 범죄를 규율하는 영역에서 법조 전문가들의 상이한 죄명 적용의 현상을 관찰하고 최종 양형에 영향을 미치는 요인들을 검사와 법관 집단 비교를 통해 살펴보는 것을 주요 목적으로 하였다. 이를 위하여 검찰에 의해 기소된 사건과 법관에 의해 인정된 사건의 죄명을 분류하여 최종 선고에 영향을 미치는 요인들을 살폈다. 연구에 사용된 자료는 2016년까지 산업기술유출 범죄로 기소된 사건들을 대 상으로 하였고 분석방법은 판결문 내용분석 방식을 선택하였다. 분석에 사용된 종속변수는 유무죄선고, 징역형 선고, 집행유예 선고이다. 독립변 수들로는 범죄자들의 인구학적 요인, 법조인정보, 범죄행위 상황요인, 재판부의 형식을 주요하게 살폈다. 이러한 자료들을 내용분석 방식으로 변 수화하였고 최종적으로는 다중선형회귀분석과 로지스틱 회귀분석을 통해 영향을 미치는 요인들을 밝혀내었다. 연구 결과에 따르면 기소한 죄명과 판사가 인정한 죄명이 상이하기도 하고, 상이한 결정요인차이가 발생하기도 하였지만, 공통적이면서 반복적으로 변호인의 유형과 재판부의 유형(합의부 재판부)이 기소죄명과 선고 죄명 기준으로 유의미한 양형차이 유발 요인으로 도출되었다. 개인의 인구학적 요인들은 법조인 정보가 삽입되면서 그 영향력이 희석되었다. 더욱 구체적인 연구결과 및 함의들은 본문에서 논의하기로 한다.

A pilot-scale biocover was installed at a sanitary landfill for municipal waste, and the removal of volatile organic compounds (VOCs) by the biocover was evaluated for a long period of 550 days. The biocover (2.5 m W × 5 m L × 1 m H) was constructed with the mixture of soil, perlite, earthworm cast and compost (6:2:1:1, v/v). The total VOCs concentration of the inlet gas into the biocover was 820.3 ppb~7,217.9 ppb, and the total VOCs concentration of the outlet gas from the surface of the biocover was 12.6 ppb~1,270.1 ppb. The average removal efficiency of total VOCs was 87.6 ± 11.0% (60.5% for minimum and 98.5% for maximum). Toluene concentration was the highest among the inlet VOCs, followed by ethylbenzene, m, p-xylene and o-xylene. These aromatic VOCs accounted for more than 50% of the total VOCs concentration. Other than these aromatic VOCs, hexane, cyclohexane, heptane, benzene, and acetone were major VOCs among the inlet VOCs. Compared with the VOC profiles in the inlet gas, the relative contribution of dichloromethane to the outlet VOCs emitted from the biocover layer increased from 0.1% to 15.3%. The average removal efficiencies of BTEX in the biocover were over 84% during the operation period of 550 days. The average removal efficiencies of hexane, cyclohexane and heptane in the biocover were 86.0 ± 18.9%, 85.4 ± 20.4% and 97.1 ± 4.0%, respectively. The removal efficiency of VOCs in the biocover decreased not only when the ambient temperature had fallen below 5oC, but also when the ambient temperature had risen above 23oC. Information on the VOCs removal characteristics of the biocover installed in the landfill field can be useful for commercializing the biocover technology for the treatment of VOCs.

In this study, 40 residents of the Gwangyang and Yeosu areas were assessed for their level of exposure to heavy metals (As, Cd, Ni) from April 2017 to June 2018. The aim was to understand the differences in levels of indoor exposure to heavy metals (As, Cd, Ni), and a health risk assessment was conducted to determine whether there was any fatal cause from carcinogenic elements. The mean concentrations of PM10 particles indoors were As 0.24 μg/m3, Cd 0.07 μg/m3, and Ni 0.89 μg/m3. The health risk assessment for the arsenic, cadmium, and nickel in indoor air confirmed that the mean values exceeded the cancer risk tolerances specified by the U.S. EPA, for As (males 3.07 × 10−4, females 3.35 × 10−4), Cd (males 3.83 × 10−5, females 4.18 × 10−5), and Ni (males 6.36 × 10−5, females 6.95 × 10−5).

The incidence of stomach cancer has been found to be gradually decreasing; however, it remains one of the most frequently occurring malignant cancers in Korea. According to statistics of 2017, stomach cancer is the top cancer in men and the fourth most important cancer in women, necessitating methods for its early detection and treatment. Considerable research in the field of bioinformatics has been conducted in cancer studies, and bioinformatics approaches might help develop methods and models for its early prediction. We aimed to develop a classification method based on deep learning and demonstrate its application to gene expression data obtained from patients with stomach cancer. Data of 60,483 genes from 334 patients with stomach cancer in The Cancer Genome Atlas were evaluated by principal component analysis, heatmaps, and the convolutional neural network (CNN) algorithm. We combined the RNA-seq gene expression data with clinical data, searched candidate genes, and analyzed them using the CNN deep learning algorithm. We performed learning using the sample type and vital status of patients with stomach cancer and verified the results. We obtained an accuracy of 95.96% for sample type and 50.51% for vital status. Despite overfitting owing to the limited number of patients, relatively accurate results for sample type were obtained. This approach can be used to predict the prognosis of stomach cancer, which has many types and underlying causes.

This study was performed to investigate the contamination characteristics of water in the scrubber with the aim of stably maintaining the scrubber, and to comprehend the removal characteristics of sulfur compounds, which are odorous substances, when microbubbles were supplied to the circulation water tank of a scrubber. The results of our analysis found that 63 kinds of gas compounds were detected from the scrubber, and thus it could be determined that Sulfur compounds, Ammonia (base compounds), Aldehyde compounds, and Pyrazine compounds were generated from the process for the production of sesame oil. About 93% of ammonia was removed in the scrubber; however, it was hard to remove Sulfur compounds, Aldehyde compounds and Pyrazine compounds using the scrubber. The efficiency of hydrogen sulfide, methylmercaptan and dimethydisulfide removal using only water in the scrubber was 79.8%, 79.7%, and 81.0%, respectively. However, when microbubbles were supplied to the scrubber, the removal efficiency for each was 83.7%, 91.1%, and 96.1%, respectively. Therefore, it was confirmed that the efficiency of sulfur compound removal was improved by supplying microbubbles to the circulation water tank of the scrubber. In addition, the amount of removal that could be achieved by using microbubbles was 1.05- 1.19 times higher than using only water. In terms of supplying microbubbles, it was confirmed that the saturation time required to absorb odorous gases was about 2.8 times longer than the time without microbubbles because the OH radicals generated when the microbubbles are shrinking partly oxidized organic matter. When there was no chemical in the circulation water tank, the conductivity and CODCr concentration were highly correlated. Therefore the system, which can replace circulation water by using real-time conductivity data, can be considered to be applicable.

The use of non-therapeutic antibiotics as animal feed additives has raised public health concerns due to the increasing resistance of pathogens to antibiotics. It is therefore required to develop safe and effective alternative feed additives to replace non-therapeutic antibiotics. The aim of this study was to assess the effects of the multiherbal compound, KIOM-C, on growth performance and immune response of growing-to-finishing pigs under farm conditions. The experimental trials were performed in a Korean commercial swine growing-to-finishing complex, and a total of 70-day-old 160 pigs were selected. Eighty pigs were treated with KIOM-C at the level of 2 kg/tonne until slaughter age (KT group), while another 80 pigs were not treated with KIOM-C (NT group). All animals were vaccinated against foot-and-mouth disease (FMD) at 60 and 110 days of age. During the trial period, average daily weight gain (ADWG), average daily feed intake (ADFI), feed conversion ratio (FCR), survival rates, and average slaughter ages were measured. The serum concentrations of tumor necrosis factor-a (TNF-α), interferon-γ (IFN-γ), and IgA were also evaluated. In order to evaluate specific humoral immune responses, the foot-and-mouth disease virus (FMDV) serotype O-specific antibody was measured. The ADWG, ADFI, and FCR of the KT group were significantly greater than those of the NT group (p<0.05). Serum concentrations of IgA in the KT group was statistically higher than the NT group. The antibody levels of the KT group against FMDV serotype O was higher than the NT group, and 86.67% of the KT group tested positive for anti-FMDV antibodies. Overall, these findings suggest that KIOM-C improves growth performance and immune response of pigs under growing-to-finishing farm conditions, and implies that the herbal compound may be used as a suitable alternative feed additive.

프랑스 헌법상 지방자치의 헌법적 근거는 프랑스 헌법 제1조, 제34조 제3항 및 제12장에서 찾을 수 있으며, 특히 프랑스 헌법 제72조에서 도 출되는 헌법적 가치로서의 “자유로운 행정의 원칙”에 근거하고 있다고 분석된다. 프랑스 헌법상 자유로운 행정은 선출된 지방의회와 지방자치단체를 대표하는 상원에 의해 제도적으로 보장되며, 자유로운 행정의 최소한의 요구조건인 지방의회의 선출은 정치적 성격을 가지는 것으로 이해되고 있으며, 이에 따라 외국인의 투표권 문제와 평등선거의 원칙의 측면에서 여러 결과를 초래하고 있다. 자유로운 행정이 효과적으로 작동하기 위해서는 지방자치단체가 법적 및 재정적 수단을 가져야 함을 의미한다. 그런데 프랑스의 경우 지방자 치단체의 일정한 결정의 자율성은 국가에 의해 행사되는 행정적 통제와 단일국가적 특성에 따른 규범제정권의 통일성을 유지할 필요성으로 인하여 상대적 결정의 자율성을 가지는 것으로 평가된다. 재정적 자율성과 관련하여, 지방자치단체의 세입을 정하는 것은 입법자의 권한이지만, 프랑스 헌법재판소는 이와 같은 입법자의 권한을 자유재량으로 이해하고 있지는 않은 것으로 판단된다. 프랑스 헌법상 국가와 지방자치단체 간의 권한의 분할을 정하는 것은 기본적으로 입법자의 권한이라고 이해되며, 이에 대해 프랑스 헌법재판소는 제한적 통제권을 행사하고 있는 것으로 판단된다. 또한, 프랑스 헌법상 지방자치단체간의 일체의 감독은 금지되며, 프랑스 헌법재판소 또한 일련의 결정을 통해 이와 같은 지방자치단체간의 감독의 금지가 존중 될 수 있도록 감시하고 있다.

Inflammation is an important protective response mechanism that occurs against microbial invasion or injury. However, excessive inflammation may lead to cause of morbidity and mortality in diseases. The activated macrophages plays a vital role in inflammatory response by stimulation of lipopolysaccharide (LPS) and tumor necrosis factor-α (TNF-α). This activation further damages the host by inducing certain pro-inflammatory mediators such as nitric oxide (NO), interleukin-1β (IL-1β), interleukin- 6 (IL-6), TNF-α, inducible nitrous oxide (iNOS) and cyclooxygenase (COX-2). Flavonoids are bioactive compounds with potential effects as anti-cancer, anti-inflammation, anti-viral and anti-bacterial activities. Polymethoxyflavones (PMFs) are unique to citrus plants which are of specific interest owing to their biological effects that includes lipoprotein metabolism and anti-inflammatory activity. Sinensetin is one of the PMFs having five methoxy groups on the basic benzo-γ-pyrone skeleton with a carbonyl group at the C4 position. Sinensetin have been known for exerting various pharmacological activities including anti-angiogenesis, anti-diabetic and anti-inflammatory activities. However, there are no studies focused on the anti-inflammatory effects of sinensetin on skeletal muscle cells. In the present study, we investigated the antiinflammatory effect of flavonoids isolated from Sinensetin on the production of pro-inflammatory mediators mediated by nuclear factor-kappa B (NF-κB) by inhibition of signal transduction in LPS - induced L6 skeletal muscle cells.

The purpose of this study is to create a new odor analysis technology that combines the separation technology of GC and the measurement of MOS sensors. The detector of the GC system is replaced with the MOS sensor to analyze various odor compounds. Carrier gas also used air in the normal atmosphere through a micro pump. Therefore, it is possible to develop a portable odor analysis device since no additional cylinder is needed. Retention times for H2S, C7H8, and C2H4O analyzed by the combined GC/MOS system were identified as 1.28 minutes, 3.88 minutes and 1.77 minutes, respectively. Measurement reproducibility of odorous RT was very good at less than 1.2 %RSD. Also, the magnitude of the peak as a result of changes in the concentration of each odor showed a linear proportional relationship. Thus, a new method could be proposed to analyze various odorous substances with the combined GC/MOS system.

A powder mixture of 70 wt% Al2O3 and 30 wt% hydroxyapatite (HA) is sintered at 1300 ℃ or 1350 ℃ for 2 h at normal pressure. An MgF2-added composition to make HA into fluorapatite (FA) is also prepared for comparison. The samples without MgF2 show α & β-tricalcium phosphates (TCPs) and Al2O3 phases with no HA at either of the sintering temperatures. In the case of 1,350 ℃, a CaAl4O7 phase is also found. Densification values are 69 and 78 %, and strengths are 156 and 104MPa for 1,300 and 1,350 ℃, respectively. Because the decomposition of HA produces a H2O vapor, fewer large pores of 5-6 μm form at 1,300 ℃. The MgF2-added samples show FA and Al2O3 phases with no TCP. Densification values are 79 and 87%, and strengths are 104 and 143 MPa for 1,300 and 1,350 ℃, respectively. No large pores are observed, and the grain size of FA (1-2 μm) is bigger than that of TCP (0.7 μm ≥) in the samples without MgF2. The resulting TCP/Al2O3 and FA/Al2O3 composites fabricated in situ exhibit strengths 6-10 times higher than monolithic TCP and HA.

Supercapacitors are attracting much attention in sensor, military and space applications due to their excellent thermal stability and non-explosion. The ionic liquid is more thermally stable than other electrolytes and can be used as a high temperature electrolyte, but it is not easy to realize a high temperature energy device because the separator shrinks at high temperature. Here, we report a study on electrochemical supercapacitors using a composite electrolyte film that does not require a separator. The composite electrolyte is composed of thermoplastic polyurethane, ionic liquid and fumed silica nanoparticles, and it acts as a separator as well as an electrolyte. The silica nanoparticles at the optimum mass concentration of 4wt% increase the ionic conductivity of the composite electrolyte and shows a low interfacial resistance. The 5 wt% polyurethane in the composite electrolyte exhibits excellent electrochemical properties. At 175 ℃, the capacitance of the supercapacitor using our free standing composite electrolyte is 220 F/g, which is 25 times higher than that at room temperature. This study has many potential applications in the electrolyte of next generation energy storage devices.

We prepared Y3Al5O12;Ce3+,Pr3+ transparent ceramic phosphor using a solid state reaction method. By XRD pattern analysis and SEM measurement, our phosphors reveal an Ia-3d(230) space group of cubic structure, and the transparent ceramic phosphor has a polycrystal state with some internal cracks and pores. In the Raman scattering measurement with an increasing temperature, lattice vibrations of the transparent ceramic phosphor decrease due to its more perfect crystal structure and symmetry. Thus, low phonon generation is possible at high temperature. Optical properties of the transparent ceramic phosphor have broader excitation spectra due to a large internal reflection. There is a wide emission band from the green to yellow region, and the red color emission between 610 nm and 640 nm is also observed. The red-yellow phosphor optical characteristics enable a high Color Rendering Index (CRI) in combination with blue emitting LED or LD. Due to its good thermal properties of low phonon generation at high temperature and a wide emission range for high CRI characteristics, the transparent ceramic phosphor is shown to be a good candidate for high power solid state white lighting.

Recently, metal cases are widely used in smart phones for their luxurious color and texture. However, when a metal case is used, electric shock may occur during charging. Chip capacitors of various values are used to prevent the electric shock. However, chip capacitors are vulnerable to electrostatic discharge(ESD) generated by the human body, which often causes insulation breakdown during use. This breakdown can be eliminated with a high-voltage chip varistor over 340V, but when the varistor voltage is high, the capacitance is limited to about 2pF. If a chip capacitor with a high dielectric constant and a chip varistor with a high voltage can be combined, it is possible to obtain a new device capable of coping with electric shock and ESD with various capacitive values. Usually, varistors and capacitors differ in composition, which causes different shrinkage during co-firing, and therefore camber, internal crack, delamination and separation may occur after sintering. In addition, varistor characteristics may not be realized due to the diffusion of unwanted elements into the varistor during firing. Various elements are added to control shrinkage. In addition, a buffer layer is inserted in the middle of the varistor-capacitor junction to prevent diffusion during firing, thereby developing a co-fired product with desirable characteristics.

In the current steel structures of high-rise buildings, high heat input welding techniques are used to improve productivity in the construction industry. Under the high heat input welding, however, the microstructures of the weld metal (WM) and heat-affected zone (HAZ) coarsen, resulting in the deterioration of impact toughness. This study focuses mainly on the effects of fine TiN precipitates dispersed in steel plates and B addition in welding materials on grain refinement of the HAZ microstructure under submerged arc welding (SAW) with a high heat input of 200 kJ/cm. The study reveals that, different from that in conventional steel, the γ grain coarsening is notably retarded in the coarse grain HAZ (CGHAZ) of a newly developed steel with TiN precipitates below 70 nm in size even under the high heat input welding, and the refinement of HAZ microstructure is confirmed to have improved impact toughness. Furthermore, energy dispersive spectroscopy (EDS) and secondary-ion mass spectrometry (SIMS) analyses demonstrate that B is was identified at the interface of TiN in CGHAZ. It is likely that B atoms in the WM are diffused to CGHAZ and are segregated at the outer part of undissolved TiN, which contributes partly to a further grain refinement, and consequently, improved mechanical properties are achieved.